JP2013190569A - Imaging apparatus - Google Patents

Abstract

An imaging apparatus capable of satisfactorily capturing a moving image is provided.
A subject detection unit that detects a subject based on a light beam from an optical system, a selection unit that selects a subject from the detected subjects, and focus detection that detects a focus state of the optical system. A focus adjustment unit 170 that adjusts the focus of the optical system by driving the focus adjustment lens 212 in the optical axis direction based on the focus detection result, and a lens that focuses the focus adjustment lens 212 on the target subject. An input unit 150 that allows the photographer to input the driving speed of the focus adjustment lens 212 when driving to the position, and an acquisition unit 170 that acquires the driving speed of the focus adjustment lens 212 input by the photographer. When the target subject is selected, the focus adjustment unit 170 sets the focus adjustment lens 212 as the target subject at the driving speed of the focus adjustment lens 212 set by the photographer. Imaging apparatus characterized by driving to the lens position where the focus.
[Selection] Figure 1

Description

  The present invention relates to an imaging apparatus.

  2. Description of the Related Art Conventionally, imaging devices capable of moving image shooting are known. In such an imaging apparatus, a technique is known in which an object such as a face is detected during moving image shooting, and the focus of the optical system is adjusted so that the detected object is in focus (see, for example, Patent Document 1). ).

JP 2008-176152 A

  2. Description of the Related Art There is a known shooting method that obtains a cinematic effect by slowly focusing on a target subject during movie shooting. However, in the prior art, when taking a moving image with such a shooting method, the photographer needs to manually focus the target subject by manually driving the focus adjustment lens. It was sometimes difficult to shoot well.

  The problem to be solved by the present invention is to provide an imaging apparatus capable of capturing a moving image satisfactorily.

  The present invention solves the above problems by the following means. In the following description, the reference numerals corresponding to the drawings showing the embodiments of the present invention are used for explanation, but these reference numerals are only for facilitating the understanding of the present invention and are not intended to limit the invention. Absent.

  [1] An imaging apparatus according to the present invention includes a subject detection unit (170) for detecting a subject based on a light beam from an optical system having a focus adjustment lens (212), and a subject detected by the subject detection unit. Based on the focus detection result by the selection part (170) which selects a target object from the inside, the focus detection part (163) which detects the focus state of the optical system, and the focus detection part, the focus adjustment lens is moved to the optical axis. By driving in the direction, the focus adjustment unit (170) that adjusts the focus of the optical system, and the drive speed of the focus adjustment lens when driving the focus adjustment lens to a lens position that focuses on the target subject. An input unit (150, 152) that can be input by the photographer, and an acquisition unit (170) that acquires the driving speed of the focusing lens input by the photographer via the input unit. When the target subject is selected, the focus adjustment unit drives the focus adjustment lens to a lens position that focuses on the target subject at a driving speed of the focus adjustment lens set by the photographer. It is characterized by that.

  [2] In the invention related to the imaging apparatus, the image pickup apparatus further includes a mode setting unit (150) capable of setting a moving image shooting mode, and the focus adjusting unit (170) is set to the moving image shooting mode. When the target subject is selected, the focus adjustment lens (212) is driven to the lens position that focuses on the target subject at the driving speed of the focus adjustment lens set by the photographer. Can do.

  [3] In the invention related to the imaging apparatus, the focus detection unit (163) detects a shift amount of the image plane by the optical system, thereby detecting a focus of the optical system by detecting a focus of the optical system. Can be configured.

  [4] In the invention related to the imaging apparatus, the focus adjustment unit (170) drives the focus adjustment lens (212) to a lens position for focusing on the target subject when the target subject is selected. After that, the focus adjustment lens can be configured to be driven to a position on the near side or the infinity side by a predetermined distance from the target subject.

  [5] In the invention related to the imaging apparatus, the input unit (150) can input a time from when the focus adjustment lens (212) is started to when the target subject is focused, The focus adjustment unit (170) is configured to notify the photographer when the target subject is selected when a time until focusing on the target subject is input by the photographer via the input unit. A drive speed of the focus adjustment lens that can focus on the target subject in an input time is calculated, and the focus adjustment lens is driven to a lens position that focuses on the target subject at the calculated drive speed. can do.

  According to the present invention, a moving image can be captured satisfactorily.

FIG. 1 is a block diagram showing a camera according to the present embodiment. FIG. 2 is a diagram illustrating a configuration example of the focus detection module. FIG. 3 is a rear view of the camera body according to the present embodiment. FIG. 4 is a flowchart showing the operation of the camera according to this embodiment. FIG. 5 is a diagram illustrating an example of an image displayed on the screen of the display. FIG. 6 is a diagram for explaining the operation of the camera according to the present embodiment. FIG. 7 is a diagram for explaining the operation of the camera according to the present embodiment. FIG. 8 is a rear view of a camera body according to another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a single-lens reflex digital camera 1 according to this embodiment, and illustration and description of a general configuration of the camera other than the configuration related to the imaging apparatus of the present invention are partially omitted.

  As shown in FIG. 1, the single-lens reflex digital camera 1 (hereinafter simply referred to as camera 1) of the present embodiment includes a camera body 100 and a lens barrel 200, and the camera body 100 and the lens barrel 200 are detachable. Combined as possible.

  The lens barrel 200 incorporates a photographing optical system including lenses 211, 212, 213 and a diaphragm 220.

  The focus lens 212 is provided so as to be movable along the optical axis L1 of the lens barrel 200, and its position is adjusted by the lens driving motor 230 while its position is detected by the encoder 260.

  The specific configuration of the moving mechanism along the optical axis L1 of the focus lens 212 is not particularly limited. For example, a rotating cylinder is rotatably inserted into a fixed cylinder fixed to the lens barrel 200, a helicoid groove (spiral groove) is formed on the inner peripheral surface of the rotating cylinder, and the focus lens 212 is fixed. The end of the lens frame is fitted into the helicoid groove. Then, by rotating the rotating cylinder by the lens driving motor 230, the focus lens 212 fixed to the lens frame moves linearly along the optical axis L1. The lens barrel 200 is provided with lenses 211 and 213 other than the focus lens 212. Here, the embodiment will be described by taking the focus lens 212 as an example.

  As described above, the focus lens 212 fixed to the lens frame by rotating the rotating barrel with respect to the lens barrel 200 moves straight in the direction of the optical axis L1, but the lens drive motor 230 as its drive source is operated by the lens mirror. The tube 200 is provided. The lens driving motor 230 and the rotating cylinder are connected by a transmission composed of a plurality of gears, for example, and when the driving shaft of the lens driving motor 230 is driven to rotate in any one direction, it is transmitted to the rotating cylinder at a predetermined gear ratio, and When the rotating cylinder rotates in any one direction, the focus lens 212 fixed to the lens frame moves straight in any direction of the optical axis L1. When the drive shaft of the lens drive motor 230 is rotated in the reverse direction, the plurality of gears constituting the transmission also rotate in the reverse direction, and the focus lens 212 moves straight in the reverse direction of the optical axis L1.

  The position of the focus lens 212 is detected by the encoder 260. As described above, the position of the focus lens 212 in the direction of the optical axis L1 correlates with the rotation angle of the rotating cylinder. Therefore, for example, if the relative rotation angle of the rotating cylinder with respect to the lens barrel 200 is detected, the position is obtained. Can do.

  As the encoder 260 of the present embodiment, an encoder that detects the rotation of a rotating disk coupled to the rotational drive of the rotating cylinder with an optical sensor such as a photo interrupter and outputs a pulse signal corresponding to the number of rotations, or a fixed cylinder And the contact point of the brush on the surface of the flexible printed wiring board provided on either one of the rotating cylinders, and the brush contact provided on the other, the amount of movement of the rotating cylinder (in either the rotational direction or the optical axis direction) A device that detects a change in the contact position according to the detection circuit using a detection circuit can be used.

  The focus lens 212 moves in the direction of the optical axis L1 from the end portion (also referred to as the closest end) on the camera body 100 side to the end portion on the subject side (also referred to as the infinity end) by the rotation of the rotating cylinder described above. be able to. Incidentally, the current position information of the focus lens 212 detected by the encoder 260 is sent to the camera control unit 170 described later via the lens control unit 250. Then, the drive amount of the focus lens 212 calculated based on the position information of the focus lens 212 is sent from the camera control unit 170 via the lens control unit 250, and based on this, the lens drive motor 230 is driven.

  The aperture 220 has an aperture diameter centered on the optical axis L1 in order to limit the amount of light flux that passes through the imaging optical system and reaches the image sensor 110 provided in the camera body 100 and adjusts the amount of blur. It is configured to be adjustable. Adjustment of the aperture diameter by the aperture 220 is performed by transmitting an appropriate aperture diameter calculated in the automatic exposure mode from the camera control unit 170 to the aperture drive unit 240 via the lens control unit 250, for example. In addition, the adjustment of the aperture diameter is performed by a manual operation via the operation unit 150 provided in the camera body 100, and the set aperture diameter is transmitted from the camera control unit 170 to the aperture drive unit 240 via the lens control unit 250. Is also done. The aperture diameter of the aperture 220 is detected by an aperture aperture sensor (not shown), and the lens controller 250 recognizes the current aperture diameter.

  On the other hand, the camera body 100 includes a mirror system 120 for guiding the light flux from the subject to the image sensor 110, the finder 135, the photometric sensor 137, and the focus detection module 161. The mirror system 120 includes a quick return mirror 121 that rotates by a predetermined angle between the observation position and the imaging position of the subject around the rotation axis 123, and the quick return mirror 121 that is pivotally supported by the quick return mirror 121. And a sub mirror 122 that rotates in accordance with the rotation. In FIG. 1, a state where the mirror system 120 is at the observation position of the subject is indicated by a solid line, and a state where the mirror system 120 is at the imaging position of the subject is indicated by a two-dot chain line.

  The mirror system 120 is inserted on the optical path of the optical axis L1 in the state where the subject is at the observation position of the subject, while rotating so as to retract from the optical path of the optical axis L1 in the state where the subject is in the imaging position.

  The quick return mirror 121 is composed of a half mirror, and in a state where the subject is at the observation position, the quick return mirror 121 reflects a part of the light flux (optical axes L2 and L3) from the subject (optical axis L1). Then, the light is guided to the finder 135 and the photometric sensor 137, and a part of the light beam (optical axis L4) is transmitted to the sub mirror 122. On the other hand, the sub mirror 122 is configured by a total reflection mirror, and guides the light beam (optical axis L4) transmitted through the quick return mirror 121 to the focus detection module 161.

  Therefore, when the mirror system 120 is at the observation position, the light flux (optical axis L1) from the subject is guided to the finder 135, the photometric sensor 137, and the focus detection module 161, and the subject is observed by the photographer and exposure calculation is performed. And the focus adjustment state of the focus lens 212 is detected. Then, when the photographer fully presses the release button, the mirror system 120 rotates to the photographing position, and all the luminous flux (optical axis L1) from the subject is guided to the image sensor 110, and the photographed image data is stored in a memory (not shown). To do.

  The light flux (optical axis L2) from the subject reflected by the quick return mirror 121 forms an image on a focusing screen 131 disposed on a surface optically equivalent to the image sensor 110, and forms a pentaprism 133 and an eyepiece lens 134. It is possible to observe through. At this time, the transmissive liquid crystal display 132 superimposes and displays a focus detection area mark on the subject image on the focusing screen 131 and relates to shooting such as the shutter speed, aperture value, and number of shots in an area outside the subject image. Display information. As a result, the photographer can observe the subject, its background, and photographing related information through the finder 135 in the photographing preparation state.

  In addition, a photometric lens 136 and a photometric sensor 137 are provided in the vicinity of the eyepiece lens 134 to receive a part of subject light imaged on the focusing screen 131.

  The photometric sensor 137 is composed of a two-dimensional color CCD image sensor or the like, and divides the photographing screen into a plurality of regions and outputs a photometric signal corresponding to the luminance of each region in order to calculate an exposure value at the time of photographing. A signal detected by the photometric sensor 137 is output to the camera control unit 170 and used for automatic exposure control and detection of a specific subject.

  The focus detection module 161 is a focus detection element for executing automatic focusing control by a phase difference detection method using subject light, and the imaging surface of the imaging element 110 of the light beam (optical axis L4) reflected by the sub-mirror 122. It is fixed at an optically equivalent position.

  FIG. 2 is a diagram illustrating a configuration example of the focus detection module 161 illustrated in FIG. The focus detection module 161 of this embodiment includes a condenser lens 161a, a diaphragm mask 161b in which a pair of openings are formed, a pair of re-imaging lenses 161c, and a pair of line sensors 161d. Although not shown, the line sensor 161d of the present embodiment includes a pixel having a microlens disposed in the vicinity of a planned focal plane of the imaging optical system and a photoelectric conversion element disposed with respect to the microlens. A plurality of pixel columns are provided. A pair of image signals can be acquired by receiving a pair of light fluxes passing through a pair of regions having different exit pupils of the focus lens 212 by each pixel arranged in the pair of line sensors 161d. The focus adjustment state can be detected by obtaining a phase shift between a pair of image signals acquired by the pair of line sensors 161d by a correlation calculation described later.

  For example, as shown in FIG. 2, when the subject P is imaged on the equivalent plane (planned imaging plane) 161e of the image sensor 110, the focused state is achieved, but the focus lens 212 moves in the direction of the optical axis L1, If the imaging point deviates from the equivalent surface 161e toward the subject (referred to as the front pin) or deviates toward the camera body (referred to as the rear pin), the focus is shifted.

  When the imaging point of the subject P is shifted from the equivalent surface 161e toward the subject, the interval W between the pair of image signals detected by the pair of line sensors 161d becomes shorter than the interval W in the focused state, and vice versa. If the imaging point of the subject P is shifted to the camera body 100 side, the interval W between the pair of image signals detected by the pair of line sensors 161d becomes longer than the interval W in the focused state.

  That is, in the in-focus state, the image signals detected by the pair of line sensors 161d overlap with the centers of the respective line sensors, but in the out-of-focus state, the image signals are deviated from the center of the line sensors. Since a phase difference occurs, it is possible to focus by moving the focus lens 212 by an amount corresponding to the phase difference (deviation amount).

  The AF-CCD control unit 162 controls accumulation conditions such as gain and accumulation time of the line sensor 161d of the focus detection module 161 in the autofocus mode, and a plurality of pairs of line sensors provided in the focus detection module 161. The image signal detected in 161d is read in correspondence with each focus detection area AFP, and the read image signal is output to the camera control unit 170 and the defocus calculation unit 163.

  The defocus calculation unit 163 converts the shift amount of the pair of image signals corresponding to each focus detection area AFP sent from the AF-CCD control unit 162 into a defocus amount, and converts this to the lens drive amount calculation unit 164. Output.

  Based on the defocus amount sent from the defocus calculation unit 163, the lens drive amount calculation unit 164 calculates a lens drive amount Δd corresponding to the defocus amount, and outputs this to the lens drive control unit 165. .

  The lens drive controller 165 drives the lens drive motor 230 based on the lens drive amount Δd sent from the lens drive amount calculator 164 and adjusts the position of the focus lens 212.

  The image sensor 110 is provided on the optical axis L1 of the light beam from the subject of the camera body 100, and is provided on a planned focal plane of the imaging optical system including the lenses 211, 212, and 213, and a shutter 111 is provided on the front surface thereof. ing. The image sensor 110 is a device in which a plurality of photoelectric conversion elements are two-dimensionally arranged, and can be composed of a device such as a two-dimensional CCD image sensor, a MOS sensor, or a CID. The image signal photoelectrically converted by the image sensor 110 is subjected to image processing by the camera control unit 170 and then stored in a memory (not shown). Note that the memory for storing the photographed image can be constituted by a built-in memory or a card-type memory.

  The camera control unit 170 includes a microprocessor and peripheral components such as a memory. The camera control unit 170 reads an image signal from the image sensor 110, performs predetermined information processing as necessary, generates image data, and generates the generated image data. And stored in a memory (not shown). In addition, the camera control unit 170 controls the entire camera 1 such as correction of captured image information, detection of the focus adjustment state of the lens barrel 200, and detection of the aperture adjustment state.

  The operation unit 150 includes, for example, a shutter release button, a switch for starting moving image shooting, and a mode setting switch for setting various operation modes of the camera 1. The focus mode / manual focus mode can be switched. The shutter release button switch includes a first switch SW1 that is turned on when the button is half-pressed and a second switch SW2 that is turned on when the button is fully pressed.

  Further, in the present embodiment, as shown in FIG. 3, two switches 151 and 152 are provided as the operation unit 150 on the back surface of the camera body 100. FIG. 3 is a rear view of the camera body 100 according to the present embodiment. Details of operations of these switches 151 and 152 will be described later.

  As shown in FIG. 3, the display 180 is provided on the back surface of the camera body 100 and displays a through image based on the image signal obtained by the image sensor 110 on a screen provided in the display 180.

  Next, the operation of the camera 1 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the camera 1 according to this embodiment. Hereinafter, for example, the operation of the camera 1 in a scene in which the moving image shooting mode is set by the photographer will be described via the operation unit 150. The operation described below is started when the moving image shooting button is turned on.

  In step S101, the camera control unit 170 acquires an image signal for subject recognition from the photometric sensor 137, and a specific subject is detected based on the acquired image signal. Here, FIG. 5 is an example of an image displayed on the screen of the display 180. In the example shown in FIG. 5, a human face is detected as the specific subject, and the camera control unit 170 specifies the human face from the captured image by performing template matching using the template image of the human face. Detect as a subject. The specific subject is not limited to a human face, and for example, an animal face may be detected as the specific subject.

  In step S102, the camera control unit 170 superimposes the recognition frame 52 on the specific subject detected in step S101, and a through image in which the recognition frame 52 is superimposed on the specific subject as shown in FIG. Displayed on the screen. For example, in the example shown in FIG. 5, four face areas A, B, C, and D are detected as specific subjects, and for each of the detected four face areas A, B, C, and D, A recognition frame 52 that matches the position of the human face region is superimposed.

  In step S103, the camera control unit 170 determines whether the target subject has been selected from the specific subjects. The target subject is a subject that the photographer wants to focus on among the specific subjects detected in step S101. For example, in the present embodiment, as shown in FIG. 5, the through image is displayed on the left side of the screen provided in the display 180, and the face areas A and B of the four people detected in step S101 are displayed on the right side. , C, D (specific subject) are displayed. For example, the photographer operates the switch 151 shown in FIG. 3 in the operation unit 150 to select a face area to be focused on among the four face areas A, B, C, and D (specific subjects). The selected face area can be determined as the target subject by pressing the shutter release button and determining. If it is determined that the target subject has been selected, the process proceeds to step S104, and the camera control unit 170 identifies the target subject selected by the photographer. On the other hand, if the target subject is not selected, the process waits in step S103 until the target subject is selected by the photographer.

  In step S105, the camera control unit 170 determines whether or not the drive speed of the focus lens 212 for setting the focus on the target subject has been set. In the present embodiment, as shown in FIG. 3, a switch 152 is provided on the back of the camera body 100, and the photographer operates the switch 152 to focus the target subject when the focus lens 212 is in focus. The driving speed can be set. For example, in the example shown in FIG. 3, three stages of driving speeds can be set by the switch 152. That is, in the example shown in FIG. 3, the switch 152 includes three switches, and the lens driving speed when focusing on the target subject is set to one of “low speed”, “medium speed”, and “high speed”. It is possible to set. When the photographer sets the lens driving speed when focusing on the target subject via the switch 152, the camera control unit 170 sets the driving speed of the focus lens 212 when focusing on the target subject. Judge that it was done.

  If it is determined in step S105 that the drive speed of the focus lens 212 has been set, the process proceeds to step S106, and the camera controller 170 acquires the drive speed of the focus lens 212 set by the photographer. On the other hand, if it is determined that the drive speed of the focus lens 212 is not set, the process waits in step S105 until the drive speed of the focus lens 212 is set.

  The three speeds “low speed”, “medium speed”, and “high speed” set by the switch 152 shown in FIG. 3 are not particularly limited. For example, the target subject can be focused slowly, Accordingly, the driving speed of the focus lens 212 that can shoot a moving image with a cinematic effect can be set to “low speed”, while the focus lens 212 that can quickly change the subject in focus. Can be set to “high speed”, and an intermediate speed between “low speed” and “high speed” can be set to “medium speed”.

  In step S107, a focus detection calculation is performed to detect the focus state of the optical system. Specifically, first, charges are accumulated by the line sensor 161 d of the focus detection module 161, and signal information accumulated by the line sensor 161 d is read by the defocus calculation unit 163. In the present embodiment, a plurality of focus detection areas AFP are set in the shooting screen, and the defocus calculation unit 163 reads and reads the signal information of the focus detection area AFP corresponding to the target subject selected by the photographer. Based on the obtained signal information, the defocus amount of the focus detection area AFP corresponding to the target subject is calculated.

  In step S108, a process for driving the focus lens 212 at a lens driving speed set by the photographer is executed. Specifically, first, the lens driving amount calculation unit 164 drives the focus lens 212 to the in-focus position corresponding to the target subject based on the defocus amount of the focus detection area AFP corresponding to the target subject. Necessary lens driving amount is calculated. Then, the calculated lens drive amount is sent to the focus lens drive motor 230 via the lens control unit 250, and the focus lens drive motor 230 drives the focus lens 212 based on the calculated lens drive amount. .

  In this embodiment, the driving speed of the focus lens 212 set by the photographer (the lens driving speed when focusing on the target subject acquired in step S106) is set via the lens control unit 250. The focus lens 212 is sent to the drive motor 230 and is driven by the focus lens drive motor 230 at the drive speed of the focus lens 212 set by the photographer. For example, when the lens driving speed for focusing on the target subject is set to “low speed” by the photographer via the switch 152 shown in FIG. 3, the “low speed” set by the photographer is set. The focus lens 212 is driven.

  In step S109, the camera control unit 170 performs in-focus determination. In the present embodiment, for example, when the defocus amount calculated in step S107 is equal to or smaller than a predetermined value, it is determined to be in focus, and the process proceeds to step S110, where the drive of the focus lens 212 is stopped. On the other hand, if the defocus amount exceeds the predetermined value and is not determined to be in focus, the process returns to step S107, and the focus detection calculation is repeated until focus is determined, and focus is performed at the lens driving speed set by the photographer. The lens 212 is driven.

  Next, an operation example of the camera 1 according to the present embodiment will be described with reference to FIGS. Here, in FIG. 6, as shown in FIG. 6 (A), from the state where the tree located on the infinity side is in focus, the person X located on the closest side as shown in FIG. 6 (B). This example illustrates a scene in which a moving image that produces a cinematic effect is obtained by slowly focusing on the subject. For example, in order to focus slowly on the person X located on the closest side, the photographer selects the person X as a target subject using the switch 151 shown in FIG. 5 and also uses the switch 152 shown in FIG. The driving speed of the focus lens 212 when focusing on is set to “low speed”. As a result, in the camera body 100, the person X is specified as the target subject (step S104), and the driving speed of the focus lens 212 when focusing on the target subject is acquired as “low speed” (step S106). Then, the camera control unit 170 captures a moving image while slowly driving the focus lens 212 at the driving speed of the focus lens 212 set by the photographer, that is, “low speed” (step S108), and finally Then, the focus lens 212 is driven to the lens position of the focus lens 212 that focuses on the person X that is the target subject (steps S109 and S110). As described above, in the present embodiment, the photographer simply selects the target subject to be focused, and sets the driving speed of the focus lens 212 at the time of focusing to, for example, “low speed”, as shown in FIG. As described above, it is possible to focus slowly from the background tree to the person X, and it is possible to easily shoot a moving image with a cinematic effect.

  On the other hand, FIG. 7 illustrates a scene where a sports scene is photographed. As shown in FIG. 7A, the person Y traveling in front is in focus and is shown in FIG. 7B. In this manner, the scene in which the subject to be photographed is quickly switched by quickly focusing on the person Z traveling behind is illustrated. For example, in order to quickly focus on the person Z traveling behind, the photographer selects the person Z as a target subject using the switch 151 shown in FIG. 5, and also uses the switch 152 shown in FIG. The driving speed of the focus lens 212 when matching is set to “high speed”. Thereby, in the camera body 100, the person Z is specified as the target subject (step S104), and the driving speed of the focus lens 212 when focusing on the target subject is acquired as “high speed” (step S106). Then, the camera control unit 170 captures a moving image while quickly driving the focus lens 212 at the driving speed of the focus lens 212 set by the photographer, that is, “high speed” (step S108), and finally, The focus lens 212 is driven to the lens position of the focus lens 212 that focuses on the person Z that is the target subject (steps S109 and S110). As described above, in this embodiment, the photographer simply selects the target subject to be focused, and sets the driving speed of the focus lens 212 at the time of focusing to “high speed”, for example, as shown in FIG. In this way, it is possible to quickly focus on different subjects. As described above, in this embodiment, a good moving image according to the shooting scene is shot by changing the drive speed of the focus lens 212 when the photographer focuses on the target subject according to the shooting scene. can do.

  As described above, in the present embodiment, the subject selected by the photographer is specified as the target subject, and the focus adjustment for the target subject is performed at the lens driving speed set by the photographer. Thus, in the present embodiment, for example, when the lens driving speed when the photographer focuses on the target subject is set to “low speed”, the subject subject is slowly focused and a cinematic effect is achieved. It is possible to easily shoot moving images that are effective, and the target subject selected by the photographer is selected when the lens drive speed is set to "high speed" when the photographer focuses on the subject subject. By quickly focusing on the subject, it is possible to quickly switch the subject to be photographed.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, the configuration in which the driving speed of the focus lens 212 when the subject is focused is set by the switch 152 illustrated in FIG. 5 is exemplified. However, the configuration is not limited to this configuration. As shown in the figure, the driving speed of the focus lens 212 may be set using a dial 153. Further, the lens driving speed determined in advance by the photographer is stored in the switch 152 shown in FIG. 5, and when the subject is focused, the switch 152 is used to set the lens driving speed determined in advance by the photographer. The focus lens 212 may be driven.

  Further, in the above-described embodiment, the configuration in which the target subject is selected by the switch 151 illustrated in FIG. 5 is illustrated. However, the configuration is not limited thereto. For example, the display 180 includes a touch panel, and the photographer selects the specific subject. A configuration may be adopted in which a target subject is selected by tapping a subject to be focused from among. In this case, the driving speed of the focus lens 212 when the subject is focused can be set by the number of taps. For example, when the touch panel is tapped twice in succession, the driving speed of the focus lens 212 when focusing on the target subject is set to “high speed”, and when the touch panel is tapped only once, the target subject is selected. Alternatively, the driving speed of the focus lens 212 when focusing on may be set to “low speed”.

  Furthermore, in the above-described embodiment, the configuration in which the target subject is focused at the lens driving speed set by the photographer when moving image shooting is illustrated. However, for example, the photographer sets the focus when shooting a through image. A configuration may be adopted in which the subject is focused at the lens driving speed.

  In the above-described embodiment, as illustrated in FIG. 5, a specific subject such as a person's face area is detected, and the configuration in which the subject selected by the photographer among the detected specific subjects is focused is exemplified. For example, when the photographer selects a background on the infinity side or a subject on the near side, the subject may be focused on the background on the infinity side or the subject on the near side. In this case, for example, by displaying an image such as a background together with a specific subject (a person's face area A, B, C, D) on the right side of the screen example shown in FIG. A background or a near subject can be selected as a subject.

  Furthermore, in the above-described embodiment, the configuration in which the focus lens 212 is driven to the lens position that focuses on the target subject is exemplified. However, the present invention is not limited to this configuration. For example, when the target subject is selected, the target subject is A configuration may be adopted in which the focus is adjusted to a position on the near side or infinity side by a predetermined distance from the existing position. As a result, it is possible to shoot a moving image with an effect such that the target subject is blurred after the target subject is once focused.

  In addition, in the above-described embodiment, the configuration in which the focus lens 212 is driven to the lens position that focuses on the target subject based on the lens driving speed set by the photographer is illustrated, but the present invention is not limited to this configuration. For example, when a time for moving the focus lens 212 to a lens position for focusing on the target subject is input by the photographer via the operation unit 150, the focus lens 212 is input by the photographer. A lens driving speed that can be moved to a lens position that focuses on the target subject in time may be calculated, and the focus lens 212 may be driven to a lens position that focuses on the target subject at the calculated lens driving speed.

  In the above-described embodiment, the configuration in which the focus state of the optical system is detected based on the shift amount (phase difference) of the image signal detected by the pair of line sensors 161d is illustrated, but the configuration is not limited thereto. For example, the focus evaluation value is maximized by calculating the focus evaluation value based on the image signal obtained from the image sensor 110 at each lens position while driving the focus lens 212 at a predetermined sampling interval (distance). The focus detection may be performed using a contrast detection method in which the lens position of the focus lens 212 is determined as the in-focus position.

  Furthermore, in the above-described embodiment, the configuration in which photometry is performed by the photometric sensor 137 is illustrated, but the configuration is not limited to this configuration, and for example, the configuration in which photometry is performed by the image sensor 110 may be employed.

  The camera 1 of the above-described embodiment is not particularly limited. For example, the present invention is applied to other optical devices such as a digital video camera, a lens interchangeable digital camera, a lens-integrated digital camera, and a camera for a mobile phone. You may apply.

DESCRIPTION OF SYMBOLS 1 ... Single-lens reflex digital camera 100 ... Camera body 110 ... Image pick-up element 137 ... Photometric sensor 150 ... Operation part 151 ... Switch for object subject selection 152 ... Switch for lens drive speed setting 161 ... Focus detection module 170 ... Camera control part 180 ... display 200 ... lens barrel

Claims (5)

A subject detection unit for detecting a subject based on a light beam from an optical system having a focus adjustment lens;
A selection unit for selecting a target subject from the subjects detected by the subject detection unit;
A focus detection unit for detecting a focus state of the optical system;
A focus adjustment unit that performs focus adjustment of the optical system by driving the focus adjustment lens in an optical axis direction based on a focus detection result by the focus detection unit;
An input unit that allows a photographer to input a driving speed of the focus adjustment lens when driving the focus adjustment lens to a lens position that focuses on the target subject;
An acquisition unit that acquires the driving speed of the focus adjustment lens input by the photographer via the input unit;
When the target subject is selected, the focus adjustment unit drives the focus adjustment lens to a lens position that focuses on the target subject at a driving speed of the focus adjustment lens set by the photographer. An imaging apparatus characterized by the above. The imaging apparatus according to claim 1,
It further includes a mode setting section that can set the movie shooting mode,
In the case where the moving image shooting mode is set, the focus adjustment unit moves the focus adjustment lens at the driving speed of the focus adjustment lens set by the photographer when the target subject is selected. An imaging apparatus that is driven to a lens position that focuses on a target subject. The imaging apparatus according to claim 1, wherein:
The imaging apparatus according to claim 1, wherein the focus detection unit is capable of performing focus detection by a phase difference detection method that performs focus detection of the optical system by detecting an amount of image plane shift by the optical system. The imaging apparatus according to any one of claims 1 to 3,
When the target subject is selected, the focus adjustment unit drives the focus adjustment lens to a lens position that focuses on the target subject, and then moves the focus adjustment lens by a predetermined distance from the target subject. An image pickup apparatus that is driven to a position on the near side or infinity side. The imaging apparatus according to any one of claims 1 to 4,
The input unit is capable of inputting a time from the start of driving the focus adjustment lens to focusing on the target subject.
The focus adjustment unit is input to the photographer when the target subject is selected when a time until focusing on the target subject is input by the photographer via the input unit. The driving speed of the focus adjustment lens that can focus on the target subject in a predetermined time is calculated, and the focus adjustment lens is driven to the lens position that focuses on the target subject at the calculated drive speed. Imaging device.

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