CN108319035A - Optical projection module and its control method - Google Patents
Optical projection module and its control method Download PDFInfo
- Publication number
- CN108319035A CN108319035A CN201810247193.9A CN201810247193A CN108319035A CN 108319035 A CN108319035 A CN 108319035A CN 201810247193 A CN201810247193 A CN 201810247193A CN 108319035 A CN108319035 A CN 108319035A
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- diffraction
- optical projection
- laser beam
- projection module
- beam emitting
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
A kind of optical projection module and its control method, the optical projection module includes laser beam emitting device, collimation camera lens, diffraction device and photosensitive device, camera lens is collimated to be set to above laser beam emitting device, diffraction device is set to above collimation camera lens, and photosensitive device is set to light of the side of diffraction device for incuding diffraction device directive side week.The control method includes：Open laser beam emitting device；The light sent out from diffraction device is incuded using photosensitive device, and different electrical signal of reaction is generated according to the power of light；The variation of the electrical signal of reaction sent out according to photosensitive device judges whether diffraction device work is normal, and when judging that diffraction device work is abnormal, control laser beam emitting device is closed.The optical projection module and its control method, the light that diffraction device side week is incuded by photosensitive device sends out different electrical signal of reaction, judge whether diffraction device work is normal, and laser beam emitting device is closed when abnormal, the strong light projected from diffraction device is avoided and is damaged to human eye.
Description
Technical field
The present invention relates to technical field of electronic products, more particularly to a kind of optical projection module and its control method.
Background technology
Currently, structured light technique has increasingly developed into a kind of stereoscopic imaging technology of relative maturity, people can be applied to
Face identifies that the basic functional principle of human-computer interaction, the fields such as three dimensions scanning, structured light technique is the projection of optical projection module
Have the light pattern of certain structuring, such as the random scatter spot disperseed, the scatter spot of these randomnesss is projected into object
Body surface face, then project by image acquisition device the scatter spot of body surface and can obtain object then according to calculating
The depth information of body realizes recognition of face, human-computer interaction, the functions such as three dimensions scanning.
The light pattern of the structuring of optical projection module projection swashs generally by send out laser (such as VCSEL)
Light, collimated lens receive, and convergence forms collimated light beam and outward projects, then through diffraction optical device (DOE) to warp
The collimated light beam that collimation lens is projected carries out dispersion formation, however, when abnormal (such as rupturing, having occur in diffraction optical device
Droplet is dirty) when, can not just effective diffraction be carried out to laser, cause diffracted ray abnormal, diffraction optical device local laser
Energy quantitative change is strong, it is most likely that human eye is damaged.
Invention content
The object of the present invention is to provide a kind of optical projection modules for avoiding damaging human eye because of diffraction optical device exception
And its control method.
The embodiment of the present invention provides a kind of optical projection module, including laser beam emitting device, collimation camera lens, diffraction device and
Photosensitive device, the collimation camera lens are set to above the laser beam emitting device, and the diffraction device is set on the collimation camera lens
Side, the light that the laser beam emitting device is sent out is collimated through the collimation camera lens, then is projected after the diffraction device diffraction, institute
State the light that photosensitive device is used to incude diffraction device directive side week set on the side of the diffraction device.
Further, the photosensitive device is used for according to its light intensity from the diffraction device side week incuded
It is different and generate different electrical signal of reaction.
Further, the photosensitive device is light sensitive diode or light sensing transistor, is sensed according to the photosensitive device
The light intensity in the diffraction device side week generate different current or voltage signals.
Further, the optical projection module further includes circuit board, the laser beam emitting device and the photosensitive device
It is electrically connected with the circuit board.
Further, the optical projection module further includes control circuit, and the control circuit is used for according to described photosensitive
The electrical signal of reaction that device is sent out judges whether the diffraction device work is normal, is judging that the diffraction device work is abnormal
When, the control circuit controls the laser beam emitting device and closes, when judging that the diffraction device is working properly, the laser
Emitter works normally.
Further, the optical projection module further includes pedestal, and the pedestal is the tubular of both ends open, the collimation
Camera lens is set in pedestal, and the laser beam emitting device is set to the bottom of the pedestal, the diffraction device and the photosensitive device
Set on the top of the pedestal.
Further, holding tank and the mounting groove positioned at the holding tank side are offered at the top of the pedestal, it is described
Diffraction device is set in the holding tank, and the photosensitive device is set in the mounting groove.
Further, the photosensitive device is electrically connected at the circuit board by lead, or uses flexible PCB
The mode of connection is electrically connected with the circuit board.
The present invention also provides a kind of control methods, and for controlling above-mentioned optical projection module, which includes following
Step：
Open the laser beam emitting device；
The light in diffraction device directive side week is incuded using the photosensitive device, and difference is generated according to light intensity
Electrical signal of reaction；
The variation of the electrical signal of reaction sent out according to the photosensitive device judges whether the diffraction device work is normal,
It when judging that the diffraction device work is abnormal, controls the laser beam emitting device and closes, judging the diffraction device work
When normal, the laser beam emitting device normal work.
Further, the photosensitive device is light sensitive diode or light sensing transistor, is sensed according to the photosensitive device
The light intensity in the diffraction device side week generate different current or voltage signals.
The optical projection module and control method of the present invention incudes the light that diffraction device projects by photosensitive device and sends out
Different electrical signal of reaction judges whether diffraction device work is normal, and laser beam emitting device is closed when abnormal, is avoided from diffraction
Device project strong light and human eye is damaged.
Description of the drawings
Fig. 1 is the schematic front view of the optical projection module of one embodiment of the invention；
Fig. 2 is the side view of optical projection module shown in Fig. 1；
Fig. 3 is the vertical view of optical projection module shown in Fig. 1；
Fig. 4 is the control block of optical projection module shown in Fig. 1；
Fig. 5 is the flow chart of the control method of the optical projection module of one embodiment of the invention.
Specific implementation mode
It is of the invention to reach the technical approach and effect that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Specific implementation mode, structure, feature and its effect of the present invention is described in detail as after in accompanying drawings and embodiments.
As shown in Figures 1 to 4, a kind of optical projection module of one embodiment of the invention offer, including laser beam emitting device 12,
Collimate camera lens 14, diffraction device 16, photosensitive device 18, circuit board 20 and connector 22.Camera lens 14 is collimated to fill set on Laser emission
12 tops are set, diffraction device 16 is set to 14 top of collimation camera lens, and the side that photosensitive device 18 is set to diffraction device 16 is spread out to incude
The light in 16 directive side week of injection device.Circuit board 20 is electrically connected at laser beam emitting device 12, to control laser beam emitting device 12
It emits beam.Connector 22 is electrically connected at circuit board 20, and circuit board 20 is connected to the components such as controller (not shown).This
Collimation camera lens 14 and diffraction device 16 are sequentially arranged in the light path of laser beam emitting device 12 by sample, and laser beam emitting device 12 is sent out
Light successively collimated camera lens 14 collimates, dispersedly projected after 16 diffraction of diffraction device.In the present embodiment, 18 electricity of photosensitive device
Property is connected to circuit board 20.In this way, the electrical signal of reaction sent out is transferred to circuit board 20 by photosensitive device 18.Specifically, laser
Emitter 12 can be vertical cavity surface emitting laser (VCSEL), can also be parallel resonance chamber surface-emitting laser
Device.Diffraction device 16 can be surface miniature carving structure diffraction element.
In this optical projection module, photosensitive device 18 can be sent out according to the circuit board 20 not in the same direction of the light intensity of its induction
Different electrical signal of reaction, and then be turned on and off according to the different electrical signal of reaction control laser beam emitting device 12.Specifically
Ground, photosensitive device 18 can be light sensitive diode or light sensing transistor, can be generated according to the power of the light in 16 side of diffraction device week
Different current or voltage signals.When diffraction device 16 is working properly, diffraction device 16 will be from the light that is emitted of collimation camera lens 14
The point light source that line is concentrated is converted to speckle pattern, the emergent light of diffraction device 16 more equably its front of directive and side
In week, stronger electrical signal of reaction can be sensed by being at this moment located at the photosensitive device 18 of 16 side of diffraction device；When diffraction device 16 is broken
When splitting or having the foreign matters such as droplet, the diffraction structure in at least partly region of diffraction device 18 can not work normally and make at least partly
Light is still maintained the point light source concentrated with light and is projected from diffraction device 18, necessarily lead to diffraction device 18 without diffraction
Local laser can enhance, correspondingly, side week light can die down, the electrical signal of reaction that at this moment photosensitive device 18 senses is weaker, production
Raw current or voltage will become smaller, and control circuit 30 is after receiving the electrical signal of reaction that photosensitive device 18 is sent out, you can
Judge that the laser state projected from diffraction device 16 changes.If diffraction device 16 work it is abnormal, cause its local laser increase
By force, when side week light dies down, at this moment, control circuit 30 will send out control signal, and laser beam emitting device 12 is closed in control, to keep away
Exempt from the local laser projected from diffraction device 16 relatively by force to damage human eye；When diffraction device 16 is working properly, control electricity
Road 30 does not send out the control signal that control laser beam emitting device 12 is closed, and laser beam emitting device 12 works normally.
In the present embodiment, the top of photosensitive device 18 protrudes out the top of diffraction device 16, more preferable with sharp photosensitive device 18
Ground incudes the light from the top directive of diffraction device 16 its side week.
Specifically, control circuit 30 can be arranged directly on circuit board 20, or can also be electrically connected by circuit
In circuit board 20.
In the present embodiment, circuit board 20 is set to the lower section of laser beam emitting device 12, and prolongs towards 12 side of laser beam emitting device
It stretches, connector 22 is set to one end opposite with laser beam emitting device 12 of circuit board 20.It can be by circuit board 20 by connector 22
It is electrically connected with realizations such as ambient controllers, to realize the transmission of signal.
In the present embodiment, which further includes pedestal 24, and pedestal 24 is the tubular of both ends open, collimates camera lens
14 are set in pedestal 24, and laser beam emitting device 12 is set to the bottom of pedestal 24, and diffraction device 16 and photosensitive device 18 are set to pedestal
24 top.Specifically, the top of pedestal 24 offers holding tank 242 and the mounting groove 244 positioned at 242 side of holding tank, spreads out
Injection device 16 is set in holding tank 242, and photosensitive device 18 is set in mounting groove 244.It, can be in pedestal 24 when photosensitive device 18 is installed
Mounting groove 244 bottom dispensing, then photosensitive device 18 is placed on dispensing position, to which photosensitive device 18 is fixed on pedestal
On 24.
Specifically, photosensitive device 18 is electrically connected at circuit board 20 by lead 26, and lead 26 is located at the side of pedestal 24,
Laser direct forming (LDS, Laser Direct Structuring) mode or metal burying forming specifically can be used in lead 26
(insert Molding) mode is formed.In addition, photosensitive device 18 can also be by the way of flexible PCB (FPCB) connection
It is electrically connected with circuit board 20.
Photosensitive device 18 includes pin, and lead 26 and one end of the pin electric connection of photosensitive device 18 form pad, then
The pad of the pin of photosensitive device 18 and lead 26 is electrically connected for example, by tin welding.Lead 26 and circuit board 20 can then lead to
Cross some elargol or welding manner electrical connection.
As shown in figure 5, the control method of one embodiment of the invention, for controlling above-mentioned optical projection module, including it is following
Step：
S11 opens laser beam emitting device 12.
Laser beam emitting device 12 emits beam after opening, and successively collimated camera lens 14 collimates, after 16 diffraction of diffraction device
It projects.
S13 is incuded the light in 16 directive side week of diffraction device using photosensitive device 18, and generates difference according to light intensity
Electrical signal of reaction.
Photosensitive device 18 can send out different electrical signal of reaction according to the circuit board 20 not in the same direction of the light intensity of its induction.
Specifically, photosensitive device 18 can be light sensitive diode or light sensing transistor, can be produced according to the light intensity in 16 side of diffraction device week
Raw different current or voltage signal, when diffraction device 16 ruptures or has the foreign matters such as droplet, local laser can enhance, side week
Light can die down, this is that photosensitive device 18 sends out current or voltage and will become smaller.
The variation of S15, the electrical signal of reaction that control circuit 30 is sent out according to photosensitive device 18 judge that diffraction device 16 works
Whether normal, when judging that diffraction device 16 works abnormal, control circuit 30 controls laser beam emitting device 12 and closes, and is judging
When the diffraction device 16 is working properly, control circuit 30 does not send out the control signal that control laser beam emitting device 12 is closed, and swashs
Light emitting devices 12 works normally.Specifically, when the current or voltage change that photosensitive device 18 generates is small, illustrate diffraction device 16
It works abnormal, there is rupture or has the foreign matters such as droplet, at this moment, control circuit 30 sends out control signal, and laser hair is closed in control
Injection device 12 makes laser beam emitting device 12 no longer emit beam, to avoid the local laser projected from diffraction device 16 is relatively strong
Human eye is damaged.
The optical projection module and control method of the present invention incudes the light that diffraction device 16 projects by photosensitive device 18
Power simultaneously sends out different electrical signal of reaction, and control circuit 30 judges whether diffraction device 16 works normally accordingly, if it happens
It is abnormal then control close laser beam emitting device 12, avoid the local laser projected from diffraction device 16 relatively by force and human eye is caused to hinder
Evil.
It the above is only presently preferred embodiments of the present invention, be not intended to limit the present invention in any form, although this
Invention is disclosed above with preferred embodiment, and however, it is not intended to limit the invention, any person skilled in the art,
It does not depart within the scope of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of variation, as long as being without departing from technical solution of the present invention content, according to the technical essence of the invention to above real
Any simple modification, equivalent change and modification made by example are applied, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of optical projection module, which is characterized in that including laser beam emitting device (12), collimation camera lens (14), diffraction device
(16) it is set to above the laser beam emitting device (12) with photosensitive device (18), the collimation camera lens (14), the diffraction device
(16) it is set to above the collimation camera lens (14), the light that the laser beam emitting device (12) sends out is through the collimation camera lens (14)
Collimation, then projected after the diffraction device (16) diffraction, the photosensitive device (18) is set to the side of the diffraction device (16)
Face is used to incude the light in the diffraction device (16) directive side week.
2. optical projection module as described in claim 1, which is characterized in that the photosensitive device (18) is used for according to its induction
The light intensity from the diffraction device (16) side week difference and generate different electrical signal of reaction.
3. optical projection module as claimed in claim 2, which is characterized in that the photosensitive device (18) be light sensitive diode or
The light intensity of light sensing transistor, the diffraction device (16) the side week sensed according to the photosensitive device (18) generates difference
Current or voltage signal.
4. optical projection module as claimed in claim 2, which is characterized in that the optical projection module further includes circuit board
(20), the laser beam emitting device (12) and the photosensitive device (18) are electrically connected with the circuit board (20).
5. optical projection module as claimed in claim 4, which is characterized in that the optical projection module further includes control circuit
(30), the electrical signal of reaction that the control circuit (30) is used to be sent out according to the photosensitive device (18) judges the diffraction device
(16) it whether normal works, when judging that the diffraction device (16) work is abnormal, described in control circuit (30) control
Laser beam emitting device (12) is closed, and when judging that the diffraction device (16) is working properly, the laser beam emitting device (12) is just
Often work.
6. optical projection module as claimed in claim 4, which is characterized in that the optical projection module further includes pedestal
(24), the pedestal (24) is the tubular of both ends open, and the collimation camera lens (14) is set in pedestal (24), the Laser emission
Device (12) is set to the bottom of the pedestal (24), and the diffraction device (16) and the photosensitive device (18) are set to the pedestal
(24) top.
7. optical projection module as claimed in claim 6, which is characterized in that offer holding tank at the top of the pedestal (24)
(242) and the mounting groove (244) positioned at the holding tank (242) side, the diffraction device (16) are set to the holding tank
(242) in, the photosensitive device (18) is set in the mounting groove (244).
8. optical projection module as claimed in claim 7, which is characterized in that the photosensitive device (18) passes through lead (26) electricity
Property be connected to the circuit board (20), or be electrically connected with the circuit board (20) by the way of flexible PCB connection.
9. a kind of control method for controlling the optical projection module as described in claim 1-8 any one, feature exists
In including the following steps：
Open the laser beam emitting device (12)；
The light in diffraction device (16) the directive side week is incuded using the photosensitive device (18), and is generated according to light intensity
Different electrical signal of reaction；
Whether just the variation of the electrical signal of reaction sent out according to the photosensitive device (18) judges the diffraction device (16) work
Often, when judging that the diffraction device (16) work is abnormal, the laser beam emitting device (12) closing is controlled, described in judgement
When diffraction device (16) is working properly, laser beam emitting device (12) normal work.
10. control method as claimed in claim 9, which is characterized in that the photosensitive device (18) is light sensitive diode or sense
Optotransistor, the light intensity in the diffraction device (16) the side week sensed according to the photosensitive device (18) generate different
Current or voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247193.9A CN108319035B (en) | 2018-03-23 | 2018-03-23 | Optical projection module and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247193.9A CN108319035B (en) | 2018-03-23 | 2018-03-23 | Optical projection module and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108319035A true CN108319035A (en) | 2018-07-24 |
| CN108319035B CN108319035B (en) | 2021-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810247193.9A Active CN108319035B (en) | 2018-03-23 | 2018-03-23 | Optical projection module and control method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269773A (en) * | 2018-09-13 | 2019-01-25 | 深圳阜时科技有限公司 | A kind of detection unit |
| CN109443696A (en) * | 2018-09-13 | 2019-03-08 | 深圳阜时科技有限公司 | A kind of detection method |
| CN111665640A (en) * | 2019-03-08 | 2020-09-15 | 三赢科技（深圳）有限公司 | Structured light projection module and electronic device thereof |
| CN113126066A (en) * | 2019-12-26 | 2021-07-16 | 华为技术有限公司 | Laser safety circuit 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 |
| CN116086770A (en) * | 2022-12-28 | 2023-05-09 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111665640A (en) * | 2019-03-08 | 2020-09-15 | 三赢科技（深圳）有限公司 | Structured light projection module and electronic device thereof |
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| CN113126067A (en) * | 2019-12-26 | 2021-07-16 | 华为技术有限公司 | Laser safety circuit and laser safety equipment |
| CN116086770A (en) * | 2022-12-28 | 2023-05-09 | 北京的卢铭视科技有限公司 | Product state monitoring method, speckle projector, electronic device, and storage medium |
| 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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|---|---|
| CN108319035B (en) | 2021-01-12 |
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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. |
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