KR100230294B1 - Method for discriminating tape in an image recording/reproducing apparatus - Google Patents

Abstract

In the video signal recording / reproducing apparatus according to the present invention, there is provided a method for discriminating whether a tape is present or not; Counter rotating the capstan motor if it is a cloth to count the pulses of the tape feed reel; Recognizing that there is a tape and setting a tape presence / absence flag when the pulse counting value of the tape supply reel is smaller than the set reference value; If the cassette housing is in a closed state from the past, determining whether it is an initial deck operation for seating the tape; If the initial deck operation, determining whether the reel brake is released position; Preparing pulse counting of the tape feed reel and the winding reel, when the reel brake is released; Rotating the capstan motor to count the pulses of the tape winding reel, and rotating the capstan motor to count the pulses of the tape feed reel; And setting a tape presence / absence flag when the pulse counting values of the tape winding reel and the supply reel are equal to or greater than the set reference value.

According to the present invention, the microcontroller can quickly determine the presence or absence of the tape by the tape cassette detection sensor provided in place of the conventional LED and the photo sensor, and can expect the mode immediately after loading as soon as the cassette housing is closed. The loading speed can be improved and the function can be displayed immediately, further improving the performance of the product.

Description

Tape discrimination method in video signal recording / playback equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining whether a tape is present in a video signal recording / reproducing apparatus. In particular, the present invention provides a method for determining whether a tape is present or not without driving a capstan motor and a sensor for detecting a top / end of the tape. The present invention relates to a method of discriminating a tape in a video signal recording / reproducing apparatus.

Mechanisms for recording information on the magnetic tape by rotating head drums or for reproducing the recorded information from the magnetic tape include a video cassette recorder (VCR), a video camera (also called a camcorder), and a digital audio tape recorder (R-DAT). It can be seen from the back. The deck mechanisms installed thereon include a cassette loading mechanism for transporting the tape cassette to a predetermined position on the deck, and two tape reels in the conveyed cassette each seated and one of the two tape reels selectively driven to wind the tape. Two reel driving tables, brake means for selectively braking the two reel driving tables, a tape loading mechanism for loading a tape into the head drum, a tension pole mechanism for pressing the loaded tape to maintain tension; And pinch roller drive means for crimping the tape between the capstan motor shaft and the pinch roller, and at least one guide means for guiding the running tape.

On the other hand, such a deck mechanism typically performs a function such as basic recording / playback (REC / PLAY) and fast fast forward / rewind (FF / REW) by changing a state of each part of the deck by a predetermined control program. Of course, it performs the functions such as playback of still and slow pictures, high-speed search and reverse playback, which are selectively added according to the product.

1 and 2 show the deck mechanism of the conventional video camera, Figure 1 is an exploded perspective view of the entire deck, Figure 2 is a perspective view of the sub deck of the entire deck of FIG.

1 and 2, the deck mechanism of a conventional video camera is largely coupled to the deck 11 forming the base of the device, and the cassette housing for guiding the insertion and ejection of the cassette by being coupled to the upper portion of the deck 11 ( 21).

The deck 11 includes a reel driving table 12s and 12t for driving a tape reel inside a cassette (not shown) inserted into the apparatus, and a head (not shown) for reading information from or writing information to the tape. A head drum 13 having a c) is provided. In addition, the pole base assembly 14s and 14t for loading and unloading the tape into the head drum 13 and the pole base assembly 14s and 14t along a predetermined movement trajectory. A loading motor 15 that provides a driving force for reciprocating movement, a capstan motor 16 for pulling the tape to provide driving force to the tape, and a relative rotational motion in close contact with the axis of the capstan motor 16. To emit light as a means for detecting the top / end of the cassette tape which is mounted and driven by the pinch roller 17 and the reel driving tables 12s and 12t. Photo sensor 19a (19b) which detects the top and the end of the tape by sensing the LED 18 and the light of the LED 18, and whether the tape can be recorded, Hi-δ / Normal and ME / MP judgment Sensor unit 20 and the like are installed. In the cassette housing 21, first and second arm members 22a and 22b for raising / lowering the housing 21 are alternately installed on both sides of the housing 21 in an X shape. .

However, the conventional video camera having the above-described configuration drives the capstan motor 16 to determine the presence / absence of the tape when the cassette housing 21 is closed or when the power is turned on. Check the reel pulse input according to 19b). Thus, since the capstan motor 16 is driven once to determine the presence / absence of the tape, the deck loading operation is delayed by that amount. In addition, since the brake conditions of the reel are different according to the position of the various mode switches of the deck, it is complicated and difficult to control the method for determining whether or not the tape is different according to each mode switch.

The present invention has been made in view of the above problems, and it is possible to discriminate the presence or absence of a tape in a video signal recording / reproducing apparatus capable of quickly determining the presence / absence of a tape without driving a tape reel by driving a capstan motor of a deck. The purpose is to provide a method.

1 is an exploded perspective view showing a deck mechanism of a conventional video camera.

Figure 2 is a perspective view of the sub deck of the deck of Figure 1;

3 is a perspective view of a sub-deck of a video camera employing a tape presence / absence determining method in a video signal recording / playback apparatus according to the present invention;

4A and 4B are flowcharts showing an execution process of a tape presence / absence determination method in a video signal recording / reproducing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: Deck 12s, 12t, 32s, 32t: Reel Drive Table

13: Head drum 14s, 14t, 34s, 34t: Pole base assembly

15: loading motor 16: capstan motor

17,37: pinch roller 18: LED

19a, 19b: photo sensor 21: cassette housing

22a: first arm member 22b: second arm member

20,30: Whether the tape can be recorded, sensor unit for Hi-δ / Normal and ME / MP judgment

30s: tape cassette detection sensor 11s, 31s: sub deck

In order to achieve the above object, in the video signal recording / playback apparatus according to the present invention, a tape presence / non-discrimination method is provided.

a) determining whether the cassette housing is cloth;

b) in step a) if the cassette housing is not cloth, recognizing that there is no tape and clearing the tape presence / absence flag;

c) if the cassette housing is a cloth in step a), determining whether the cloth is just a cloth or has been in a cloth state from the past;

d) preparing a pulse counting of the tape feed reel if the cassette housing in step c) has just been clothed;

e) driving the capstan motor at a predetermined double speed;

f) recognizing that there is no tape and clearing the tape presence / absence flag, and setting the checked tape presence / absence flag;

g) determining whether the pulse counting value of the tape feed reel is smaller than a set reference value;

h) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape supply reel in step g) is smaller than the set reference value;

i) if the cassette housing is in a closed state in the past in step c), determining whether it is an initial deck operation for seating the tape by powering on;

j) if the initial deck operation in step i), determining whether the reel brake is released;

k) preparing pulse counting of the tape feed reel and the winding reel, in the position where the reel brake is released in step j);

l) driving the capstan motor at a predetermined double speed;

m) determining whether a pulse counting value of the tape reel is greater than or equal to a set reference value;

n) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape reel in step m) is greater than or equal to the set reference value;

o) preparing pulse counting of the tape feed reel and reel;

p) driving the capstan motor at a predetermined double speed;

q) determining whether the pulse counting value of the tape feed reel is equal to or greater than a set reference value;

r) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape supply reel in step q) is greater than or equal to the set reference value; And

s) setting the checked tape presence / absence flag.

According to the present invention as described above, instead of the conventional LED and the photo sensor to determine the presence or absence of the tape by a separate program for determining the presence or absence of the tape can simplify the device configuration, in particular dedicated sensor for detecting the added tape cassette The microcontroller can quickly determine the presence / absence of the tape and predict the mode immediately after loading as soon as the cassette housing is closed. Therefore, the tape loading speed can be improved, and the function can be displayed immediately, further improving the performance of the product.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a sub deck of a video camera employing a tape presence / absence determining method in a video signal recording / reproducing apparatus according to the present invention.

Referring to FIG. 3, the sub deck 31s is provided with a conventional LED 18 and light of the LED 18 in order to implement a method of determining whether a tape is present or not in the video signal recording / reproducing apparatus according to the present invention. Photoelectric sensors 19a and 19b for sensing are not provided. Instead, a separate program for determining the presence or absence of a tape is provided inside the microcontroller (not shown). Preferably, as shown, a dedicated sensor 30s for detecting a tape cassette is separately provided in the sensor unit 30 for determining whether the tape is recordable, Hi-δ / Normal, and ME / MP. In Fig. 3, reference numerals 32s and 32t denote reel driving tables, 34s and 34t denote pole base assemblies, and 37 denote pinch rollers, respectively.

Next, a process of judging tape presence or absence according to a tape presence / absence determination method of a video signal recording / reproducing apparatus according to the present invention will be described with reference to FIGS. 4A and 4B.

4A and 4B are flowcharts showing the execution process of the tape presence / absence determination method in the video signal recording / reproducing apparatus according to the present invention.

4A and 4B, in the video signal recording / reproducing apparatus according to the present invention, the tape presence / absence determining method first determines whether or not the cassette housing is cloth (step 401). If the cassette housing is not cloth in this determination, it is recognized as no tape and the tape presence / absence determination flag is cleared (step 402), and the tape presence / absence determination program is terminated. If the cassette housing is a cloth in step 401, it is determined whether the cloth has just become a cloth or a cloth state from the past (step 403). In this determination, if the cassette housing has just been closed, pulse counting of the tape supply reel is prepared (step 404). Accordingly, the capstan motor is driven (reversely rotated) at a predetermined speed (for example, 3 times speed) (step 405). Then, it waits for about 1 second to stabilize the system (step 406), recognizes that there is no tape, clears the tape presence / absence flag, and sets the checked tape presence / absence flag (step 407). Then, it is determined whether the pulse counting value of the tape feed reel is smaller than the set reference value (e.g., eight times) (step 408). If the pulse counting value of the tape supply reel is smaller than the set reference value (8 times) in this determination, it is recognized as having a tape and the tape presence / absence flag is set (step 409), and the program is terminated. In step 408, if the pulse counting value of the tape supply reel is equal to or greater than the set reference value (8 times), the program ends immediately.

On the other hand, if the cassette housing is closed in the past in step 403, it is determined whether the initial deck operation for mounting the tape by power-on (step 410). In this determination, if it is not the initial deck operation, the program is terminated, that is, it is not the initial deck operation for seating the tape. It means that the tape has already settled after the initial deck operation. Ends the non-judgment program, and determines whether or not the reel brake is released in the initial deck operation (step 411). In this determination, if the reel brake is not in the released position, the program is terminated. That is, the reel brake is not in the released position means that the reel brake is locked. If the brake is in the released position, pulse counting of the tape feed reel and the reel is prepared (step 412). Then, the capstan motor is rotated at three times the speed (step 413). In particular, at this time, while the frequency FG generated from the capstan motor is generated, the capstan motor is continuously rotated at three times the speed. Then, it is determined whether the pulse counting value of the tape reel is equal to or greater than a set reference value (for example, four times) (step 414). In this determination, if the pulse counting value of the tape winding reel is equal to or greater than the set reference value (four times), the tape is recognized as present and the tape presence / absence judgment flag is set (step 415), and the pulse counting of the tape feeding reel and the winding reel is performed. If the pulse counting value of the tape winding reel in step 414 is less than the set reference value (4 times), the pulse counting of the tape feeding reel and the winding reel is prepared immediately (step 416). Then, the capstan motor is rotated forward at three times the speed (step 417). At this time, while the frequency FG generated from the capstan motor is generated, the capstan motor is continuously rotated at three times the forward speed. Then, it is determined whether the pulse counting value of the tape feed reel is greater than or equal to the set reference value (four times). (Step 418). At this stage, if the pulse counting value of the tape feed reel is equal to or greater than the set reference value (4 times), it is recognized as having a tape and the tape presence / absence flag is set (step 419), and then the checked tape presence / absence flag is set. In step 418, if the pulse counting value of the tape supply reel is less than the set reference value, the checked flag presence / absence flag is set immediately (step 42). This completes the tape presence / absence determination process by the tape presence / absence determination method according to the present invention.

The series of programs for determining the presence or absence of the tape as described above are, of course, prepared by the designer and stored in the microcontroller. In addition, although each execution step is shown in a sequential flow chart for detailed description, it seems that a lot of time is required for the progress of the program, but in practice, each execution step is processed at a high speed in the microcontroller.

As described above, in the video signal recording / reproducing apparatus according to the present invention, the presence / absence of a tape is determined by a separate program for determining the presence / absence of a tape instead of a conventional LED and a photo sensor. Therefore, the configuration of the device can be simplified, and the microcontroller can quickly determine the presence / absence of the tape by using a dedicated sensor for detecting the added tape cassette, and predict the mode immediately after loading as soon as the cassette housing is closed. Therefore, the tape loading speed can be improved, and the function can be displayed immediately, further improving the performance of the product.

Claims (8)

a) determining whether the cassette housing is cloth; b) in step a) if the cassette housing is not cloth, recognizing that there is no tape and clearing the tape presence / absence flag; c) if the cassette housing is a cloth in step a), determining whether the cloth is just a cloth or has been in a cloth state from the past; d) preparing a pulse counting of the tape feed reel if the cassette housing in step c) has just been clothed; e) driving the capstan motor at a predetermined double speed; f) recognizing that there is no tape and clearing the tape presence / absence flag, and setting the checked tape presence / absence flag; g) determining whether the pulse counting value of the tape feed reel is smaller than a set reference value; h) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape supply reel in step g) is smaller than the set reference value; i) if the cassette housing is in a closed state in the past in step c), determining whether it is an initial deck operation for seating the tape by powering on; j) if the initial deck operation in step i), determining whether the reel brake is released; k) preparing pulse counting of the tape feed reel and the winding reel, in the position where the reel brake is released in step j); l) driving the capstan motor at a predetermined double speed; m) determining whether a pulse counting value of the tape reel is greater than or equal to a set reference value; n) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape reel in step m) is greater than or equal to the set reference value; o) preparing pulse counting of the tape feed reel and reel; p) driving the capstan motor at a predetermined double speed; q) determining whether the pulse counting value of the tape feed reel is equal to or greater than a set reference value; r) recognizing that there is a tape and setting a tape presence / absence flag if the pulse counting value of the tape supply reel in step q) is greater than or equal to the set reference value; And and s) setting the checked tape presence / absence flag. The method of claim 1, And tape reversal in the video signal recording / reproducing apparatus, characterized in that the capstan motor is rotated at three times the speed in step e). The method of claim 1, And a step of waiting for one second for stabilization of the system after step e). The method of claim 1, And in step g), the reference pulse counting value is set to eight times. The method of claim 1, And / or continuously rotating the capstan motor at three times as long as 2000 frequencies (FG) generated from the capstan motor are generated in the step l). The method of claim 1, And the reference pulse counting value is set four times in the step m). The method of claim 1, And tape rotation in the video signal recording / reproducing apparatus, wherein the capstan motor is rotated forward at three times as long as the frequency FG generated from the capstan motor is generated in step p). The method of claim 1, And the reference pulse counting value in step q) is set to four times.

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