CN107608167A - Laser projection device and its method of controlling security - Google Patents
Laser projection device and its method of controlling security Download PDFInfo
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- CN107608167A CN107608167A CN201710943620.2A CN201710943620A CN107608167A CN 107608167 A CN107608167 A CN 107608167A CN 201710943620 A CN201710943620 A CN 201710943620A CN 107608167 A CN107608167 A CN 107608167A
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Abstract
The present invention proposes a kind of laser projection device, including light source, for launching light beam；Collimation lens, for converging the light beam of the light source transmitting, and project collimated light beam；Diffraction optical element (DOE), receive, collimated light beam described in beam splitting, and projective patterns light beam；Transparent conductive film, the surface of the collimation lens and/or the diffraction optical element is attached to, there are resistive properties；Monitoring and controlling unit, electrically connected with the transparent conductive film, for monitoring voltage signal/current signal/resistance signal between the transparent conductive film in real time, judge the integrality of collimation lens and/or DOE indirectly and carry out corresponding security control.The present invention also proposes a kind of method of controlling security of laser projection device.The laser projection device and its method of controlling security of the present invention, it is possible to increase the laser safety performance of laser projection device in use.
Description
Technical field
The present invention relates to optics, opto-electronics, more particularly to a kind of laser projection device and its method of controlling security.
Background technology
Laser projection device is widely used in the fields such as the 3-D scanning of object, space three-dimensional reconstruction, man-machine interaction.Swash
Optical projection device the spatial information of target object is marked, after being by projection coding or the special light pattern of structuring
The information gathering of phase image collecting device and three-dimensional reconstruction provide preparation.
Laser projection device for projective structure light generally comprises light source, collimation lens and diffraction optical element
(DOE).Wherein, collimation lens is used for the light beam for receiving, converging light source transmitting, and outwards emitting parallel light beam；Wherein, DOE is used
In receiving the collimated light beam of collimation lens transmitting, and collimated light beam is split, be overlapping, to be evenly distributed and uncorrelated
Special pattern light beam.Collimation lens and the important optical element that DOE is whole laser projection device.In addition, collimation is saturating
Mirror and DOE quality can also directly affect the quality for the light pattern that laser projection device is projected, and collimation lens is got over DOE performances
Well, the distortion of the light pattern of laser projection device projection is smaller, aberration is smaller, resolution ratio is higher, contrast is stronger.Laser projection
The high-quality light pattern of device projection, is advantageous to image collecting device and precisely captures the light pattern for being projeced into body surface, with
Just accurately point cloud information is provided for processor.
However, with the increase of laser projection device usage time, optical element occur unavoidably different degrees of aging,
Deformation or damage phenomenon, especially collimation lens and DOE.Because collimation lens is sealed in laser projection device with DOE, dissipate
In the case that heat is bad, collimation lens and DOE are very easy to the phenomenon for aging, deformation or damage occur.When collimation lens goes out
When existing aging, deformation or damage, collimation lens convergence, the ability of collimated light beam can be deteriorated so that directive DOE light beam is parallel
Property be deteriorated, or even can also introduce various aberrations, distortion etc.；And DOE aging, deformation or damage, then influence whether DOE diffraction
The ability of light beam.When the decline of DOE diffracted beam abilities, patterned beam that laser projection device is projected, its uniformity
Different degrees of decline also occurs with contrast, or even along with serious Zero-order diffractive light beam.So-called Zero-order diffractive light beam
In the light beam for referring to directive diffraction optical element, it is not diffracted there is a part of light beam and continues across diffraction optics
Element enters object space, i.e., it is zero not to be diffracted optical element diffraction and be just directly entered that a part of light beam of object space
Order diffraction light beam.The energy of Zero-order diffractive light beam is often several orders of magnitude higher than high order diffraction beam energy, is dealt with improperly, pole
It is possible to induce eye-safety concerns.
The content of the invention
The laser occurred in use the invention aims to solve laser projection device of the prior art
Safety problem, propose a kind of laser projection device and its method of controlling security.
The laser projection device of the present invention, including light source, for launching light beam；Collimation lens, for converging the light source
The light beam of transmitting, and project collimated light beam；Diffraction optical element (DOE), receive, collimated light beam described in beam splitting, and projective patterns
Change light beam；Transparent conductive film, the surface of the collimation lens and/or the diffraction optical element is attached to, there is resistance category
Property；Monitoring and controlling unit, electrically connected with the transparent conductive film, for monitoring the electricity between the transparent conductive film in real time
Signal/current signal/resistance signal is pressed, the integrality of collimation lens and/or DOE is judged indirectly and carries out corresponding safety control
System.
In a preferred embodiment, the monitoring and controlling unit presets secure threshold section, when the electrically conducting transparent is thin
When voltage signal/current signal/resistance signal between film exceedes the secure threshold section, the monitoring and controlling unit is carried out
Corresponding security control.Preferably, the security control includes the risk for sending the collimation lens and/or DOE damages
Prompt message either closes the light source or reduces the luminous power of the light source.
In a preferred embodiment, the transparent conductive film includes the first transparent conductive film and second transparent led
Conductive film；First transparent conductive film is attached to the surface of the collimation lens, the second transparent conductive film attachment
In the surface of the DOE.Preferably, first transparent conductive film connects in parallel or series with second transparent conductive film
Connect, and accessed by wire in the monitoring and controlling unit.In a preferred embodiment, the monitoring unit is separately
To voltage signal/current signal/resistance signal between first transparent conductive film and second transparent conductive film
It is monitored.
In a preferred embodiment, the monitoring and controlling unit includes：Constant-current source, to first transparent conductive film
And/or second transparent conductive film constant electric current is provided；Potentiometer, obtain the voltage at the first transparent conductive film both ends
Analog signal and/or the voltage analog signal at the second transparent conductive film both ends, or obtain first electrically conducting transparent
Film and second transparent conductive film in parallel or in series after total voltage analog signal；D/A change-over circuits, by the electricity
The voltage analog signal or total voltage analog signal that pressure meter obtains are converted to voltage digital signal；Memory, it is pre- for storing
If secure threshold section and deposit real-time monitor the voltage digital signal；CPU, for the institute for judging to real-time monitor
State whether voltage digital signal crosses the default secure threshold section, light is sent for the situation beyond secure threshold section
Source control instruction；Control circuit for light source, the light source control instruction that the CPU is sent is received, light source is closed or reduces light source
Luminous power.Above-mentioned voltage analog signal and voltage digital signal are referred to as voltage signal.
In a preferred embodiment, the monitoring and controlling unit includes：Constant pressure source, to first transparent conductive film
And/or second transparent conductive film constant voltage is provided；Galvanometer, obtain by the first transparent conductive film both ends
Current analog signal and/or the current analog signal by the second transparent conductive film both ends, or obtain described first
Transparent conductive film and second transparent conductive film in parallel or in series after total current analog signal；D/A change-over circuits,
The current analog signal or total current analog signal that the galvanometer is obtained are converted to current digital signal；Memory, use
The current digital signal is real-time monitored in storing default secure threshold section and depositing；CPU, for judging to supervise in real time
Whether the current digital signal measured crosses the default secure threshold section, for the feelings beyond secure threshold section
Condition sends light source control instruction；Control circuit for light source, the light source control instruction that the CPU is sent is received, closes light source or drop
The luminous power of low light source.Above-mentioned current analog signal and current digital signal are referred to as current signal.
In a preferred embodiment, the monitoring and controlling unit includes：Resistance measuring instrument, acquisition described first is transparent to be led
The resistance simulation signal of conductive film and/or the resistance simulation signal at the second transparent conductive film both ends, or described in acquisition
First transparent conductive film and second transparent conductive film in parallel or in series after all-in resistance analog signal；D/A is changed
Circuit, resistance simulation signal or all-in resistance analog signal that the potentiometer obtains are converted into resistance digital signal；Storage
Device, the resistance digital signal is real-time monitored for storing default secure threshold section and deposit；CPU, for judging
Whether the resistance digital signal real-time monitored crosses the default secure threshold section, for beyond secure threshold area
Between situation send light source control instruction；Control circuit for light source, the light source control instruction that the CPU is sent is received, closes light source
Or reduce the luminous power of light source.Above-mentioned resistance simulation signal and resistance digital signal are referred to as resistance signal.
The present invention also proposes a kind of method of controlling security of laser projection device, comprises the following steps：First, swash described
Transparent conductive film on the collimation lens of optical projection device and/or DOE surface attachment, the transparent conductive film have resistance
Attribute；Then by monitoring voltage signal/current signal/resistance signal between the transparent conductive film, judge indirectly accurate
The integrality of straight lens and/or DOE, and carry out corresponding security control.
Compared with prior art, beneficial effects of the present invention have：
The present invention laser projection device and its method of controlling security, by monitor in real time be attached to collimation lens and/or
Voltage signal/current signal/resistance signal the changing condition at the transparent conductive film both ends on DOE surfaces, realize indirectly to described
The assessment of collimation lens, DOE integralities, and then corresponding security control is carried out, make so as to improve laser projection device
Laser safety performance during.
Brief description of the drawings
Fig. 1 is laser projection device schematic diagram according to an embodiment of the invention.
Fig. 2 is the structural representation of monitoring and controlling unit according to an embodiment of the invention.
Fig. 3 (a) is monitoring and controlling cell operation flow chart according to an embodiment of the invention.
Fig. 3 (b) is voltage threshold interval diagram according to an embodiment of the invention.
Fig. 4 is the structural representation of monitoring and controlling unit according to an embodiment of the invention.
Fig. 5 is the structural representation of monitoring and controlling unit according to an embodiment of the invention.
Embodiment
The present invention is described in detail by specific embodiment below in conjunction with the accompanying drawings, for a better understanding of this hair
It is bright, but following embodiments are not intended to limit the scope of the invention.In addition, it is necessary to illustrate, the diagram provided in following embodiments
Only illustrate the basic conception of the present invention in a schematic way, the component relevant with the present invention is only shown in accompanying drawing rather than according to reality
Component count, shape during implementation and size are drawn, it is actual when implementing shape, quantity and the ratio of each component can be one kind with
The change of meaning, and its assembly layout form may also be increasingly complex.
The orientation of the instruction such as " on ", " under ", "front", "rear", " interior ", " outer ", "left", "right" it is to be appreciated that term
Or position relationship is based on orientation shown in the drawings or position relationship, is for only for ease of the description embodiment of the present invention and simplification is retouched
State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.
Fig. 1 is a kind of laser projection device schematic diagram with monitoring and controlling unit according to the present invention.In the present embodiment,
The laser projection device includes substrate 20, light source 21, lens barrel 22, collimation lens 23, the first transparent conductive film 24, DOE25, the
Two transparent conductive films 26 and monitoring and controlling unit 27.
Wherein, substrate 20 is used for fixed light source 21 and carrying lens barrel 22.Substrate 20 can be with excellent heat-conducting function
Ceramics or other suitable materials pass through the rigid plate that forms of processing and fabricating.Preferably, substrate 20 is rigid printed circuit
Plate (PCB).
Wherein, light source 21 is fixed on the side of substrate 20, outwards launches light beam.Light source 21 can be vertical cavity surface
The laser of transmitting or the edge-emitting laser on parallel resonance chamber surface are infrared, ultraviolet etc. suitable for outwards launching
The light beam of wavelength.Preferably, light source 21 is the two dimensional VCSEL chip for including at least one VCSEL light source, and the chip can be outside
Project wavelength and be 850nm infrared beam, and at least two different luminances can be realized according to control circuit.
Wherein, lens barrel 22 by it is gluing, the mode such as inlay and fix on the substrate 20, for isolating extraneous natural light and peace
Put other optical elements such as lens.Lens barrel 22 can be process by the rigid material with Thermal conductivity.Preferably, mirror
Cylinder 22 is process by good, the in light weight aluminium alloy of heat conductivility, in addition the surface of lens barrel 22 be also attached with one layer it is resistant to elevated temperatures
Insulating materials.
Wherein, collimation lens 23 is fixed in lens barrel 22 by embedded, gluing mode, for receiving the transmitting of light source 21
Light beam simultaneously outwards projects collimated light beam.Collimation lens 23 can only include a piece of lens, can also include multi-disc different attribute
Lens.The material of collimation lens 23 can be the clear glass or resin or high molecular polymer of high-purity.It is preferred that
Ground, collimation lens 23 are formed by divided glass lens combination, in addition, collimation lens 23 is located at the surface of light source 21, both it
The distance between preferably equal to collimation lens 23 equivalent focusing.
Wherein, the first transparent conductive film 24 is by the related feasible technique such as being deposited, adhering to or attach uniformly, closely
The surface of collimation lens 23 is attached to, there are obvious resistive properties.It should be understood that the first transparent conductive film 24 is to infrared
The light beam of light beam or other specific bands has higher transmissivity；In addition, the collimation lens of the first transparent conductive film 24
23 dioptric, imaging capability will not cause substantial effect.Preferably, the resistivity of the first transparent conductive film 24 is 5.12*
10-2Ω cm, can be that there is the broad-band gap sull not less than 85% transmissivity to infrared beam, such as：ITO (oxidations
Indium tin) or CTO (Cd2SnO4Cadmium stannate film) or CIO (CdIn2O4Metaindic acid cadmium film) film etc..
Wherein, DOE25 is fixed on the top of lens barrel 22 by gluing mode, and for receiving, beam splitting collimation lens 23 launches
Collimated light beam, and outwards project the patterned beam that Energy distribution is uniform, contrast is high in an overlapping manner.Similar to collimation
Lens 23, DOE25 surface by be deposited, adhere to or attach etc. related feasible technique uniformly, closely attachment have it is obvious
Second transparent conductive film 26 of resistive properties.It should be understood that the second transparent conductive film 26 to infrared beam except having
Have beyond high-transmission rate, it is necessary to it is required that its diffracting power to DOE will not cause substantial effect.Preferably, second is transparent
The resistivity of conductive film 26 is 5.12*10-2Ω cm, can be that there is the broad-band gap not less than 85% transmissivity to infrared beam
Sull, such as：ITO (tin indium oxide) or CTO (Cd2SnO4Cadmium stannate film) or CIO (CdIn2O4Metaindic acid cadmium is thin
Film) film etc..Wherein, monitoring and controlling unit 27 is thin by plain conductor and the first transparent conductive film 24, the second electrically conducting transparent
Film 26 and substrate 20 are connected, for monitoring the resistance of the first transparent conductive film 24, the second transparent conductive film 26 in real time
Situation of change, and the luminance of control light source 21.Monitoring and controlling unit 27 can be arranged on the inner side of lens barrel 22, and be fixed on
The top of substrate 20；The outside of lens barrel 22 can also be fixed on by gluing mode.Preferably, monitoring and controlling unit 27 is arranged on base
On bottom 20, and it is connected by plain conductor with the first transparent conductive film 24 and the second transparent conductive film 26, wherein, in order to
Ensure that plain conductor does not influence the transmission of the inner light beam of lens barrel 22, plain conductor can be adhered closely to the interior or/and outer of lens barrel 22
Side wall.
Refering to Fig. 1, after the collimated collimation of lens 23 of light beam that in one embodiment of the present invention, light source 21 is sent
DOE25 is incided in a manner of collimated light beam；Collimated light beam broadening is patterning light by way of beam splitting, superposition by DOE25
Beam, and with patterned beam homed on its target space.At the same time, monitoring and controlling unit 27 is attached to collimation lens by analysis
23rd, first transparent conductive film 24 on DOE25 surfaces, the resistance variations situation of the second transparent conductive film 26, indirectly realization pair
Collimation lens 23, DOE25 Integrity Verification, judgement.For collimation lens 23, DOE25 aging, deformation, damaged condition, and
When by relevant control circuit control light source 21 luminance, with ensure laser projection device project high quality, meet
The patterned beam of laser safety standard.
Further, the collimation lens 23 of monitoring and controlling unit 27 and the monitoring mode of DOE25 integralities, specifically can be with
It is interpreted as：When collimation lens 23 remains intact, the first transparent conductive film 24 is closely attached to the surface of collimation lens 23,
Preset the initial resistance R10 of the first transparent conductive film 24, then it is considered that R10 is held essentially constant, even if by
Influenceed to temperature, R10 is also to be fluctuated in a rational scope and (not less than R1 and be not more than R2)；When collimation lens 23 occurs
Aging, deformation or damage when, be attached to the surface of collimation lens 23 the first transparent conductive film 24 occur loosening, cracking,
Phenomena such as coming off, so as to cause the resistive properties of the first transparent conductive film 24 to change, i.e. the first transparent conductive film 24
Resistance R10<R1 or R10>R2.In other words, when the resistance initial value R10 amplitudes of variation of the first transparent conductive film 24 surpass
When having crossed default secure threshold section [R1, R2], collimation lens 23 there may exist the risk of damage.Similarly, monitoring control
Assessment, judgement and second electrically conducting transparent that by real time monitoring is attached to DOE25 surface of the unit 27 processed to DOE25 integralities
What the resistance variations of film 26 were realized, the initial resistance for presetting the second transparent conductive film 26 is R20 and secure threshold section
[R3, R4], when R20 amplitudes of variation have exceeded default secure threshold section [R3, R4], DOE25 there may exist damage
Risk.For collimation lens 23, the DOE25 of damage risk be present, monitoring and controlling unit 27 should send in time collimation lens 23,
The indicating risk information of DOE25 damages, and stop light source 21 and outwards launch light beam or reduce the luminous power of light source 21.
Fig. 2 is the composition schematic diagram according to the monitoring and controlling unit of the present invention.Monitoring and controlling unit 27 includes constant-current source
271st, potentiometer 272, D/A change-over circuits 273, CPU274, memory 275 and control circuit for light source 276.
In a kind of embodiment, constant-current source 271 continue to the surface of collimation lens 23 the first transparent conductive film 24 and
Second transparent conductive film 26 on DOE25 surfaces provides constant current.Potentiometer 272 can be obtained respectively by sequential control circuit
The voltage U10 at the both ends of the first transparent conductive film 24 and voltage U20 at the both ends of the second transparent conductive film 26 is taken, and is fed back to
In D/A change-over circuits 273.
Wherein, the voltage signal of the simulation of acquisition is converted into data signal and transmitted by signal by D/A change-over circuits 273
Bus is sent to CPU274.At the same time, CPU274 is by the first transparent conductive film 24 and the electricity of the second transparent conductive film 26
Pressure signal U10 and U20 is deposited into memory 275.
Wherein, memory 275 also houses default secure threshold resistance section [R1, R2] and [R3, R4].CPU274 leads to
Simple multiplication and division computing is crossed, the resistance R10 and second for calculating the first transparent conductive film of any time 23 in real time transparent is led
The resistance R20 of conductive film 26, and judge whether R10, R20 still fall within secure threshold section, and then determine whether light source control
Circuit processed sends relevant control instruction.Alternatively, memory 275 can also directly deposit default secure threshold voltage range
[U1, U2], [U3, U4]；CPU274 directly judges the voltage of the first transparent conductive film 23 by simple plus and minus calculation algorithm
Whether the voltage U20 of U10 and the second transparent conductive film 24 is fallen within secure threshold voltage range, and then determines whether light source
Control circuit sends relevant control instruction.In the present embodiment, the first transparent conductive film 24 and the second transparent conductive film
26 monitoring process is separate.The voltage of independent detection the first transparent conductive film 24 and the second transparent conductive film 26
Benefit be that can precisely prompt collimation lens or/and aging, deformation or damage phenomenon occurs in DOE, and for aging
Optical element is replaced processing.
Specifically, Fig. 3 is a kind of laser projection device workflow diagram with monitoring and controlling unit according to the present invention.
Wherein Fig. 3 (a) is the workflow diagram of monitoring and controlling unit, and Fig. 3 (b) is default secure threshold voltage range [U1, U2].Knot
Fig. 1 embodiments are closed, in order to make it easy to understand, in a kind of embodiment, the first transparent conductive film 24 and the second transparent conductive film
26 are connected in parallel by plain conductor, are then accessed again in monitoring and controlling unit 27.When collimation lens 23 and DOE25 have been kept
When good lossless, i.e. the resistance R20 of the resistance R10 of the first transparent conductive film 24 and the second transparent conductive film 26 do not become
Change, the all-in resistance R0=R10*R20/ (R10+ after now the first transparent conductive film 24 is in parallel with the second transparent conductive film 26
R20)。
Refering to Fig. 3 (a), the constant-current source 271 in monitoring and controlling unit 27 continues to the first transparent conductive film 24 and the
Two transparent conductive films 26 provide constant current I0 (first step step1).Monitoring and controlling unit 27 is obtained in real time by potentiometer 272
Total voltage U0 (collimation lens and the intact nothings of DOE after taking the first transparent conductive film 24 in parallel with the second transparent conductive film 26
During damage, total voltage U0=I0*R10*R20/ (R10+R20)) and by D/A change-over circuits 273 by voltage signal transmit to
In CPU274 (second step step2).CPU274 assesses whether total voltage U0 has crossed deposit by call instruction, plus and minus calculation
Secure threshold voltage range [U1, U2] (the 3rd step step3) in memory 275.Refering to Fig. 3 (b), when U0 falls within safety threshold
During threshold voltage section, CPU, which is performed, returns to second step operational order, and continues to keep collimation lens 23 and DOE25 monitoring；When
U0 has crossed secure threshold voltage range, and CPU sends the prompting instruction (the 4th step step4) of the damage of DOE25/ collimation lenses 23,
And light source 21 is closed by control circuit for light source 276 or reduces the luminous power (the 5th step step5) of light source 21.In this implementation
In mode, the first transparent conductive film 24 and the second transparent conductive film 26 are connected in parallel and detected as overall.
In another alternative embodiments of the present invention, the first transparent conductive film 24 and the second transparent conductive film 26 can be with
It is connected in series, is then accessed by plain conductor in monitoring and controlling unit 27.It should be appreciated that what monitoring and controlling unit obtained
All-in resistance can occur accordingly to change, now all-in resistance R0=R10+R20, with reference to Fig. 2 or Fig. 3 embodiments, what memory was deposited
Secure threshold voltage [U1, U2] should also be as making respective change.It is this equivalent to replace for the staff of the art
It is obvious to change and change.
In the alternative embodiments of the present invention, as shown in figure 4, monitoring and controlling unit 27 can also include constant pressure source 277, electricity
Flowmeter 278, D/A change-over circuits 273, CPU274, memory 275 and control circuit for light source 276.In the alternative embodiments, prison
Survey control unit 27 collimation lens 23, DOE25 monitoring flow are substantially similar with Fig. 2 or Fig. 3 embodiments, and difference is,
Monitoring and controlling unit 27 provides constant voltage to first, second transparent conductive film, and monitoring and controlling unit passes through galvanometer
278 obtain first, second transparent conductive films in parallel or series after total current signal, in memory 275 deposit have safety threshold
It is worth electric current [I1, I2], by the total current signal after monitoring first, second transparent conductive film in parallel or series whether beyond peace
Full threshold current section [I1, I2], so as to judge to be attached to collimation lens 23, DOE25 surfaces transparent conductive film resistance
Whether change, and then judge collimation lens 23, DOE25 integrality indirectly, specific implementation process is similar to Fig. 3, herein
It is not repeated to describe.
In another alternative embodiments of the present invention, transparent conductive film 24, the second transparent conductive film 26 are in parallel, monitoring
Control unit provides constant voltage by constant pressure source 277 to first, second transparent conductive film, and galvanometer 278 is respectively for the
One transparent conductive film 24, the electric current of the second transparent conductive film 26 are monitored, i.e. the first transparent conductive film 24 and second
The monitoring process of transparent conductive film 26 is separate.Independent detection the first transparent conductive film 24 and the second electrically conducting transparent
The benefit of the electric current of film 26 is can precisely to prompt collimation lens or/and DOE aging, deformation or damage phenomenon occur, and
And it is replaced processing for the optical element of aging.
In the another alternative embodiments of the present invention, as shown in figure 5, monitoring and controlling unit 27 can also include resistance measurement
Instrument 279, D/A change-over circuits 273, CPU274, memory 275 and control circuit for light source 276.In the present embodiment, resistance is surveyed
Amount instrument 279 can detect the first transparent conductive film 24, the second transparent conductive film 26 in parallel or in series after all-in resistance,
Separately the resistance of the first transparent conductive film 24, the second transparent conductive film 26 can be monitored, i.e., first is saturating
The monitoring process of the bright transparent conductive film 26 of conductive film 24 and second is separate.Deposit has safety in memory 275
Threshold resistance [R1, R2], pass through the all-in resistance signal or single after monitoring first, second transparent conductive film in parallel or series
Whether resistance exceeds secure threshold resistance section [R1, R2], so as to judge to be attached to collimation lens 23 and/or DOE25 surfaces
Whether the resistance of transparent conductive film changes, and then judges collimation lens 23 and/or DOE25 integrality indirectly, specifically
Implementation process is similar to Fig. 3, is not repeated to describe herein.The first transparent conductive film of independent detection 24 is thin with the second electrically conducting transparent
The benefit of the resistance of film 26 is can precisely to prompt collimation lens or/and DOE aging, deformation or damage phenomenon occur, and
Processing is replaced for the optical element of aging.
In the above-described embodiments, as shown in figure 1, the collimation lens 23 of laser projection device and DOE25 surface difference are attached
There are the first transparent conductive film 24 and the second transparent conductive film 26, by separately monitoring the first transparent conductive film 24
And second voltage signal/current signal/resistance signal between transparent conductive film 26, or by detecting the first electrically conducting transparent
The transparent conductive film 26 of film 24 and second in parallel or series after total voltage signal/current signal/resistance signal, judge indirectly
The integrality of collimation lens and/or DOE, and then control the working condition of the light source.Monitoring and controlling list in above-described embodiment
Member can continue timely collimation lens, DOE integralities and make rational assessment, to ensure that laser projection device projects height
Quality, the patterned beam that meets laser safety standard.
The (not shown) in the variant embodiment of the present invention, in the collimation lens 23 and DOE25 of laser projection device,
The surface attachment that can also there was only an optical element has transparent conductive film, and the electrically conducting transparent is monitored by monitoring and controlling unit
Voltage signal/current signal/resistance signal between film, collimation lens 23 or DOE25 integrality are judged indirectly, and then control
The working condition of the light source is made, can also improve the laser safety performance of laser projection device of the present invention to a certain extent.
Prior art is different from, the present invention refers to laser projection device and its method of controlling security, and its advantage is：Swash
The monitoring and controlling unit collimation lens of optical projection device, the assessment of DOE integralities judge it is to be attached to standard by monitoring in real time
Voltage signal/current signal/resistance signal the changing condition at the transparent conductive film both ends on straight lens and/or DOE surfaces is indirect
Realize.Secure threshold section is preset, when voltage signal/current signal/resistance signal of transparent conductive film crosses safety
When the upper limit or lower limit of threshold interval, monitoring and controlling unit sends the cue of collimation lens and/or DOE damages, and
Light source works are stopped by control circuit for light source or reduce the luminous power of light source, are made so as to improve laser projection device
Laser safety performance during.
It may be noted that according to the needs of implementation, each step/part described in this application can be split as more multistep
Suddenly/part, the part operation of two or more step/parts or step/part can be also combined into new step/part,
To realize the purpose of the present invention.
Above-mentioned the method according to the invention can be realized in hardware, firmware, or be implemented as being storable in recording medium
Software or computer code in (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk), or it is implemented through network download
Original storage in long-range recording medium or nonvolatile machine readable media and the meter that will be stored in local recording medium
Calculation machine code, so as to which method described here can be stored in using all-purpose computer, application specific processor or programmable or special
With such software processing in hardware (such as ASIC or FPGA) recording medium.It is appreciated that computer, processor, micro-
Processor controller or programmable hardware include can storing or receive software or computer code storage assembly (for example, RAM,
ROM, flash memory etc.), when the software or computer code are by computer, processor or hardware access and when performing, realize herein
The processing method of description.In addition, when all-purpose computer accesses the code for realizing the processing being shown in which, the execution of code
All-purpose computer is converted into the special-purpose computer for performing the processing being shown in which.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For those skilled in the art, do not taking off
On the premise of from present inventive concept, some equivalent substitutes or obvious modification can also be made, and performance or purposes are identical, all should
When being considered as belonging to protection scope of the present invention.
Claims (10)
- A kind of 1. laser projection device, it is characterised in that including：Light source, for launching light beam；Collimation lens, for converging the light beam of the light source transmitting, and project collimated light beam；Diffraction optical element (DOE), receive, collimated light beam described in beam splitting, and projective patterns light beam；Transparent conductive film, the surface of the collimation lens and/or the diffraction optical element is attached to, there are resistive properties；Monitoring and controlling unit, electrically connected with the transparent conductive film, for monitoring in real time between the transparent conductive film Voltage signal/current signal/resistance signal, judge the integrality of collimation lens and/or diffraction optical element indirectly and carry out phase The security control answered.
- 2. laser projection device as claimed in claim 1, it is characterised in that the monitoring and controlling unit presets secure threshold area Between, when voltage signal/current signal/resistance signal between the transparent conductive film exceedes the secure threshold section, The monitoring and controlling unit carries out corresponding security control.
- 3. laser projection device as claimed in claim 2, it is characterised in that the security control includes sending the collimation thoroughly Mirror and/or the indicating risk information of diffraction optical element damage either close the light source or reduce the hair of the light source Luminous power.
- 4. laser projection device as claimed in claim 1, it is characterised in that the transparent conductive film, which includes first, transparent leads Conductive film and the second transparent conductive film；First transparent conductive film is attached to the surface of the collimation lens, described Second transparent conductive film is attached to the surface of the diffraction optical element.
- 5. laser projection device as claimed in claim 4, it is characterised in that first transparent conductive film and described second Transparent conductive film connects in parallel or series, and is accessed by wire in the monitoring and controlling unit.
- 6. laser projection device as claimed in claim 5, it is characterised in that the monitoring unit is separately to described Voltage signal/current signal/resistance signal between one transparent conductive film and second transparent conductive film is monitored.
- 7. the laser projection device as described in claim 1-6 is any, it is characterised in that the monitoring and controlling unit includes：Constant-current source, constant electric current is provided to first transparent conductive film and/or the second transparent conductive film；Potentiometer, voltage analog signal and/or second electrically conducting transparent for obtaining the first transparent conductive film both ends are thin The voltage analog signal at film both ends, or obtain first transparent conductive film and second transparent conductive film it is in parallel or Total voltage analog signal after person's series connection；D/A change-over circuits, the voltage analog signal that the potentiometer is obtained or total voltage analog signal are converted to voltage number Word signal；Memory, the voltage digital signal is real-time monitored for storing default secure threshold section and deposit；Whether CPU, the voltage digital signal for judging to real-time monitor cross the default secure threshold section, pin Light source control instruction is sent to the situation beyond secure threshold section；Control circuit for light source, the light source control instruction that the CPU is sent is received, light source is closed or reduces the luminous work(of light source Rate.
- 8. the laser projection device as described in claim 1-6 is any, it is characterised in that the monitoring and controlling unit includes：Constant pressure source, constant voltage is provided to first transparent conductive film and/or the second transparent conductive film；Galvanometer, obtain by the current analog signal at the first transparent conductive film both ends and/or saturating by described second The current analog signal at bright conductive film both ends, or obtain first transparent conductive film and second electrically conducting transparent it is thin Film in parallel or in series after total current analog signal；D/A change-over circuits, the current analog signal that the galvanometer is obtained or total current analog signal are converted to electric current number Word signal；Memory, the current digital signal is real-time monitored for storing default secure threshold section and deposit；Whether CPU, the current digital signal for judging to real-time monitor cross the default secure threshold section, pin Light source control instruction is sent to the situation beyond secure threshold section；Control circuit for light source, the light source control instruction that the CPU is sent is received, light source is closed or reduces the luminous work(of light source Rate.
- 9. laser projection device as claimed in claim 1, it is characterised in that the monitoring and controlling unit includes：Resistance measuring instrument, resistance simulation signal and/or second electrically conducting transparent for obtaining first transparent conductive film are thin The resistance simulation signal at film both ends, or obtain first transparent conductive film and second transparent conductive film it is in parallel or All-in resistance analog signal after person's series connection；D/A change-over circuits, resistance simulation signal or all-in resistance analog signal that the potentiometer obtains are converted into resistance number Word signal；Memory, the resistance digital signal is real-time monitored for storing default secure threshold section and deposit；Whether CPU, the resistance digital signal for judging to real-time monitor cross the default secure threshold section, pin Light source control instruction is sent to the situation beyond secure threshold section；Control circuit for light source, the light source control instruction that the CPU is sent is received, light source is closed or reduces the luminous work(of light source Rate.
- 10. a kind of method of controlling security of laser projection device, it is characterised in that comprise the following steps：The transparent conductive film on the collimation lens of the laser projection device and/or the surface attachment of diffraction optical element, institute Stating transparent conductive film has resistive properties；By monitoring voltage signal/current signal/resistance signal between the transparent conductive film, the collimation is judged indirectly The integrality of lens and/or the diffraction optical element, and carry out corresponding security control.
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| CN201710943620.2A CN107608167A (en) | 2017-10-11 | 2017-10-11 | Laser projection device and its method of controlling security |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710943620.2A CN107608167A (en) | 2017-10-11 | 2017-10-11 | Laser projection device and its method of controlling security |
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