CN108319035B - Optical projection module and control method thereof - Google Patents
Optical projection module and control method thereof Download PDFInfo
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- CN108319035B CN108319035B CN201810247193.9A CN201810247193A CN108319035B CN 108319035 B CN108319035 B CN 108319035B CN 201810247193 A CN201810247193 A CN 201810247193A CN 108319035 B CN108319035 B CN 108319035B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract 2
- 206010070834 Sensitisation Diseases 0.000 claims 3
- 230000008313 sensitization Effects 0.000 claims 3
- 230000001939 inductive effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000003384 imaging method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
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Abstract
An optical projection module comprises a laser emitting device, a collimating lens, a diffraction device and a photosensitive device, wherein the collimating lens is arranged above the laser emitting device, the diffraction device is arranged above the collimating lens, and the photosensitive device is arranged on the side surface of the diffraction device and used for sensing light rays emitted to the side periphery by the diffraction device. The control method comprises the following steps: starting a laser emitting device; the light rays emitted from the diffraction device are sensed by the photosensitive device, and different sensing electric signals are generated according to the intensity of the light rays; and judging whether the diffraction device works normally or not according to the change of the induction electric signal sent by the photosensitive device, and controlling the laser emitting device to be closed when the diffraction device works abnormally. The optical projection module and the control method thereof can judge whether the diffraction device works normally or not by inducing the light rays around the side of the diffraction device by the photosensitive device to emit different induced electric signals, and close the laser emitting device when the diffraction device works abnormally, thereby avoiding the damage to human eyes caused by the strong light emitted from the diffraction device.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to an optical projection module and a control method thereof.
Background
At present, the structured light technology has been gradually developed into a relatively mature stereo imaging technology, and can be applied to the fields of face recognition, man-machine interaction, three-dimensional space scanning and the like, and the basic working principle of the structured light technology is that an optical projection module projects a light pattern with certain structuredness, such as scattered random scattering spots, the scattered scattering spots are projected to the surface of an object, then an image acquisition device acquires the scattering spots projected to the surface of the object, and then according to calculation, the depth information of the object can be obtained, and the functions of face recognition, man-machine interaction, three-dimensional space scanning and the like are realized.
The structured light pattern projected by the optical projection module is generally formed by receiving laser light emitted by a laser (e.g., VCSEL) through a collimating lens, converging the received laser light to form a parallel light beam, projecting the parallel light beam outwards, and then dispersing the parallel light beam projected by the collimating lens through a Diffractive Optical Element (DOE).
Disclosure of Invention
The invention aims to provide an optical projection module for preventing human eyes from being damaged due to abnormity of a diffraction optical device and a control method thereof.
The embodiment of the invention provides an optical projection module, which comprises a laser emitting device, a collimating lens, a diffraction device and a photosensitive device, wherein the collimating lens is arranged above the laser emitting device, the diffraction device is arranged above the collimating lens, light rays emitted by the laser emitting device are collimated by the collimating lens and then are diffracted by the diffraction device and then are emitted, and the photosensitive device is arranged on the side surface of the diffraction device and is used for sensing the light rays emitted to the side periphery by the diffraction device.
Further, the light sensing device is used for generating different sensing electric signals according to different sensed light intensities from the side periphery of the diffraction device.
Furthermore, the photosensitive device is a photosensitive diode or a photosensitive transistor, and different current or voltage signals are generated according to the intensity of light at the periphery of the diffraction device, which is sensed by the photosensitive device.
Furthermore, the optical projection module further comprises a circuit board, and the laser emitting device and the photosensitive device are electrically connected with the circuit board.
Furthermore, the optical projection module further comprises a control circuit, wherein the control circuit is used for judging whether the diffraction device works normally according to the induced electrical signals sent by the photosensitive device, when the diffraction device works abnormally, the control circuit controls the laser emitting device to be closed, and when the diffraction device works normally, the laser emitting device works normally.
Furthermore, the optical projection module further comprises a base, the base is in a cylindrical shape with openings at two ends, the collimating lens is arranged in the base, the laser emitting device is arranged at the bottom of the base, and the diffraction device and the photosensitive device are arranged at the top of the base.
Further, the holding tank has been seted up at the top of base and has been located the mounting groove of holding tank one side, the diffraction device is located in the holding tank, the photosensitive device is located in the mounting groove.
Furthermore, the photosensitive device is electrically connected to the circuit board through a lead, or is electrically connected to the circuit board in a flexible circuit board connection mode.
The invention also provides a control method for controlling the optical projection module, which comprises the following steps:
starting the laser emitting device;
the light rays emitted to the side periphery by the diffraction device are sensed by the photosensitive device, and different sensing electric signals are generated according to the intensity of the light rays;
and judging whether the diffraction device works normally or not according to the change of the induced electrical signal sent by the photosensitive device, controlling the laser emitting device to be closed when judging that the diffraction device works abnormally, and controlling the laser emitting device to work normally when judging that the diffraction device works normally.
Furthermore, the photosensitive device is a photosensitive diode or a photosensitive transistor, and different current or voltage signals are generated according to the intensity of light at the periphery of the diffraction device, which is sensed by the photosensitive device.
The optical projection module and the control method of the invention judge whether the diffraction device works normally or not by sensing the light emitted by the diffraction device by the photosensitive device to emit different sensing electric signals, and close the laser emitting device when the diffraction device works abnormally, thereby avoiding the damage to human eyes caused by the strong light emitted from the diffraction device.
Drawings
FIG. 1 is a schematic front view of an optical projection module according to an embodiment of the present invention;
FIG. 2 is a side view of the optical projection module of FIG. 1;
FIG. 3 is a top view of the optical projection module of FIG. 1;
FIG. 4 is a control block diagram of the optical projection module of FIG. 1;
FIG. 5 is a flowchart illustrating a control method of an optical projection module according to an embodiment of the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, an embodiment of the invention provides an optical projection module, which includes a laser emitting device 12, a collimating lens 14, a diffraction device 16, a photosensitive device 18, a circuit board 20, and a connector 22. The collimating lens 14 is disposed above the laser emitting device 12, the diffraction device 16 is disposed above the collimating lens 14, and the light sensing device 18 is disposed on a side surface of the diffraction device 16 to sense light emitted from the diffraction device 16 to the side periphery. The circuit board 20 is electrically connected to the laser emitting device 12 to control the laser emitting device 12 to emit light. The connector 22 is electrically connected to the circuit board 20 to connect the circuit board 20 to a controller (not shown) or the like. In this way, the collimating lens 14 and the diffraction device 16 are sequentially disposed on the optical path of the laser emitting device 12, the light emitted by the laser emitting device 12 is collimated by the collimating lens 14, and the light is scattered and emitted after being diffracted by the diffraction device 16. In this embodiment, the photosensitive device 18 is electrically connected to the circuit board 20. Thus, the light sensing device 18 transmits the generated induced electrical signal to the circuit board 20. Specifically, the laser emitting device 12 may be a Vertical Cavity Surface Emitting Laser (VCSEL) or a parallel cavity surface emitting laser. The diffractive device 16 may be a surface micro-structured diffractive element.
In the optical projection module, the photosensitive device 18 can send different induced electrical signals to the circuit board 20 according to different induced light intensities, and then the laser emitting device 12 is controlled to be turned on or turned off according to the different induced electrical signals. Specifically, the photosensitive device 18 may be a photosensitive diode or a photosensitive transistor, and may generate different current or voltage signals according to the intensity of light around the side of the diffraction device 16. When the diffraction device 16 works normally, the diffraction device 16 converts the point light source with concentrated light emitted from the collimating lens 14 into a speckle pattern, the light emitted from the diffraction device 16 is emitted to the front and the side periphery of the light source more uniformly, and the photosensitive device 18 on the side surface of the diffraction device 16 can sense a stronger induced electrical signal; when the diffraction device 16 is broken or there is a foreign object such as water drop, the diffraction structure of at least a partial region of the diffraction device 18 cannot work normally and at least a part of light is not diffracted, and the light is still emitted from the diffraction device 18 as a point light source with concentrated light, which inevitably causes the local laser of the diffraction device 18 to be enhanced, and accordingly, the side peripheral light is weakened, at this time, the induced electrical signal sensed by the photosensitive device 18 is weak, the generated current or voltage becomes small, and the control circuit 30 can judge the state change of the laser emitted from the diffraction device 16 after receiving the induced electrical signal emitted from the photosensitive device 18. If the diffraction device 16 is not working properly, which causes the local laser to be enhanced, and the side peripheral light is weakened, then the control circuit 30 will send out a control signal to control the laser emission device 12 to be turned off, so as to avoid the damage to the eyes due to the strong local laser emitted from the diffraction device 16; when the diffraction device 16 is operating normally, the control circuit 30 does not send out a control signal for controlling the laser emitting device 12 to be turned off, and the laser emitting device 12 operates normally.
In this embodiment, the top of the photosensitive device 18 protrudes beyond the top of the diffractive device 16, so that the photosensitive device 18 can better sense the light emitted from the top of the diffractive device 16 to the side periphery thereof.
Specifically, the control circuit 30 may be directly disposed on the circuit board 20, or may be electrically connected to the circuit board 20 through a wire.
In this embodiment, the circuit board 20 is disposed below the laser emitting device 12 and extends toward the laser emitting device 12, and the connector 22 is disposed at an end of the circuit board 20 opposite to the laser emitting device 12. The circuit board 20 can be electrically connected to an external controller or the like through the connector 22 to realize signal transmission.
In this embodiment, the optical projection module further includes a base 24, the base 24 is a cylinder with two open ends, the collimating lens 14 is disposed in the base 24, the laser emitting device 12 is disposed at the bottom of the base 24, and the diffraction device 16 and the photosensitive device 18 are disposed at the top of the base 24. Specifically, the top of the base 24 defines a receiving groove 242 and a mounting groove 244 on one side of the receiving groove 242, the diffraction device 16 is disposed in the receiving groove 242, and the photosensitive device 18 is disposed in the mounting groove 244. When the photosensitive device 18 is mounted, glue is dispensed at the bottom of the mounting groove 244 of the base 24, and then the photosensitive device 18 is placed at the glue dispensing position, so that the photosensitive device 18 is fixed on the base 24.
Specifically, the photosensitive device 18 is electrically connected to the circuit board 20 through a lead 26, the lead 26 is located on a side surface of the base 24, and the lead 26 may be formed by a Laser Direct Structuring (LDS) method or a metal embedding Molding (insert Molding) method. In addition, the photosensitive device 18 can also be electrically connected to the circuit board 20 by a Flexible Printed Circuit Board (FPCB) connection.
The photosensitive device 18 includes a lead, and the lead 26 is electrically connected to the lead of the photosensitive device 18 at one end to form a pad, and the lead of the photosensitive device 18 is electrically connected to the pad of the lead 26 by, for example, soldering. The leads 26 and the circuit board 20 may be electrically connected by means of a silver paste or soldering.
As shown in fig. 5, a control method according to an embodiment of the present invention is used for controlling the optical projection module, and includes the following steps:
s11, the laser emitting device 12 is turned on.
The laser emitting device 12 emits light after being turned on, and the light is collimated by the collimating lens 14 and then emitted after being diffracted by the diffraction device 16.
S13, the light beam emitted from the diffraction device 16 to the side periphery is sensed by the light sensing device 18, and different sensing electrical signals are generated according to the intensity of the light beam.
The photosensitive device 18 can send out different sensing electrical signals to the circuit board 20 according to the different sensed light intensities. Specifically, the photosensitive device 18 may be a photodiode or a phototransistor, and may generate different current or voltage signals according to the intensity of light around the side of the diffraction device 16, when the diffraction device 16 is broken or has foreign matter such as water drops, the local laser light may be enhanced, and the light around the side may be weakened, which means that the current or voltage emitted by the photosensitive device 18 may be reduced.
S15, the control circuit 30 determines whether the diffraction device 16 is working normally according to the variation of the induced electrical signal from the photosensitive device 18, when the diffraction device 16 is determined to be working abnormally, the control circuit 30 controls the laser emitting device 12 to turn off, and when the diffraction device 16 is determined to be working normally, the control circuit 30 does not send out the control signal for controlling the laser emitting device 12 to turn off, and the laser emitting device 12 works normally. Specifically, when the current or voltage generated by the photosensitive device 18 is decreased, which indicates that the diffraction device 16 is not working properly, and there is a crack or a water drop, the control circuit 30 sends a control signal to control the laser emitting device 12 to be turned off, so that the laser emitting device 12 does not emit light any more, and the local laser emitted from the diffraction device 16 is prevented from being strong and causing damage to human eyes.
The optical projection module and the control method of the invention induce the light intensity emitted by the diffraction device 16 through the photosensitive device 18 and emit different induced electrical signals, the control circuit 30 judges whether the diffraction device 16 works normally or not according to the induced electrical signals, and if the induced electrical signals are abnormal, the control circuit controls the laser emitting device 12 to be closed, thereby avoiding the damage to human eyes caused by stronger local laser emitted by the diffraction device 16.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An optical projection module is characterized by comprising a laser emitting device (12), a collimating lens (14), a diffraction device (16) and a photosensitive device (18), wherein the collimating lens (14) is arranged above the laser emitting device (12), the diffraction device (16) is arranged above the collimating lens (14), light rays emitted by the laser emitting device (12) are collimated by the collimating lens (14) and then emitted after being diffracted by the diffraction device (16), the photosensitive device (18) is arranged on the side surface of the diffraction device (16) and used for sensing light rays around the side surface of the diffraction device (16), the optical projection module further comprises a base (24), the base (24) is in a cylindrical shape with openings at two ends, the collimating lens (14) is arranged in the base (24), and the laser emitting device (12) is arranged at the bottom of the base (24), diffraction device (16) with sensitization device (18) are located the top of base (24), the protruding top of stretching out of sensitization device (18) the top of diffraction device (16), holding tank (242) and being located are seted up to the top of base (24) mounting groove (244) of holding tank (242) one side, diffraction device (16) are located in holding tank (242), sensitization device (18) are located in mounting groove (244).
2. The optical projection module as claimed in claim 1, wherein said light sensing means (18) is adapted to generate different induced electrical signals according to the intensity of light from the side periphery of said diffraction means (16) induced by said light sensing means.
3. The optical projection module as claimed in claim 2, wherein said photosensitive devices (18) are photodiodes or phototransistors, and different current or voltage signals are generated according to the intensity of light around the side of said diffraction device (16) sensed by said photosensitive devices (18).
4. The optical projection module of claim 2, further comprising a circuit board (20), wherein the laser emitting device (12) and the photosensitive device (18) are electrically connected to the circuit board (20).
5. The optical projection module as claimed in claim 4, wherein the optical projection module further comprises a control circuit (30), the control circuit (30) is configured to determine whether the diffraction device (16) operates normally according to the induced electrical signal generated by the photosensitive device (18), the control circuit (30) controls the laser emitting device (12) to be turned off when the diffraction device (16) operates abnormally, and the laser emitting device (12) operates normally when the diffraction device (16) operates normally.
6. The optical projection module as claimed in claim 4, wherein the photosensitive device (18) is electrically connected to the circuit board (20) by a lead (26) or electrically connected to the circuit board (20) by a flexible circuit board connection.
7. A control method for controlling an optical projection module according to any of claims 1-6, comprising the steps of:
turning on the laser emitting device (12);
the light rays emitted to the side periphery by the diffraction device (16) are sensed by the photosensitive device (18), and different sensing electric signals are generated according to the intensity of the light rays;
and judging whether the diffraction device (16) works normally or not according to the change of the induction electric signal sent by the photosensitive device (18), controlling the laser emitting device (12) to be closed when judging that the diffraction device (16) works abnormally, and controlling the laser emitting device (12) to work normally when judging that the diffraction device (16) works normally.
8. The control method according to claim 7, wherein the photosensitive devices (18) are photosensitive diodes or photosensitive transistors, and different current or voltage signals are generated according to the intensity of light around the side of the diffraction device (16) and sensed by the photosensitive devices (18).
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| CN201810247193.9A CN108319035B (en) | 2018-03-23 | 2018-03-23 | Optical projection module and control method thereof |
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| CN201810247193.9A CN108319035B (en) | 2018-03-23 | 2018-03-23 | Optical projection module and control method thereof |
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| CN108319035B true CN108319035B (en) | 2021-01-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109269773A (en) * | 2018-09-13 | 2019-01-25 | 深圳阜时科技有限公司 | A kind of detection unit |
| CN109443696B (en) * | 2018-09-13 | 2021-04-23 | 深圳阜时科技有限公司 | a detection method |
| CN111665640B (en) * | 2019-03-08 | 2022-07-26 | 三赢科技（深圳）有限公司 | Structured light projection module and electronic device thereof |
| CN113126066B (en) * | 2019-12-26 | 2024-06-18 | 华为技术有限公司 | Laser safety circuits and laser safety equipment |
| CN113126067A (en) * | 2019-12-26 | 2021-07-16 | 华为技术有限公司 | Laser safety circuit and laser safety equipment |
| CN116086770B (en) * | 2022-12-28 | 2023-11-14 | 北京的卢铭视科技有限公司 | Product state monitoring method, speckle projector, electronic device, and storage medium |
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Address after: No.3, Taihong Road, Kunshan high tech Industrial Development Zone, Suzhou, Jiangsu Province, 215300 Patentee after: Kunshan Qiuti Microelectronics Technology Co.,Ltd. Address before: No.3, Taihong Road, Kunshan high tech Industrial Development Zone, Suzhou, Jiangsu Province, 215300 Patentee before: KUNSHAN Q TECHNOLOGY Co.,Ltd. |