CN109557702A - Photoelectric scanner - Google Patents
Photoelectric scanner Download PDFInfo
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- CN109557702A CN109557702A CN201811595554.5A CN201811595554A CN109557702A CN 109557702 A CN109557702 A CN 109557702A CN 201811595554 A CN201811595554 A CN 201811595554A CN 109557702 A CN109557702 A CN 109557702A
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- control system
- optical device
- optical
- light source
- light
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention provides a kind of optical devices, have at least two not parallel surfaces, fill birefringent material between two surfaces.The present invention also provides optical system and control systems.The present invention is by applying alive variation and/or period, so that the outgoing parameter of emergent light changes, realizes scanning function；Further, synchronizing control to optical device and light source by control system can be improved the quality of scanning.
Description
Technical field
The present invention relates to optical fields, and in particular, to optical device and optical system and control system.
Background technique
The basis of electrooptic modulator is electrooptic effect.According to the refractive index variable quantity of electro-optic crystal and electric field strength
Relationship, electrooptic effect can be divided into linear electro-optic effect (Pockels effect) and quadratic electro-optical effect (Kerr effect).Because of line
Property electrooptic effect it is more obvious than the function and effect of quadratic electro-optical effect, therefore in practice be mostly used linear electrooptic modulator to light wave carry out
Modulation.Linear electrooptic modulator can be divided into longitudinal and lateral.In longitudinal modulator, field parallel is in the propagation side of light
To, and the electric field of transverse modulator is then perpendicular to the direction of light propagation.
Electrooptic effect is usually utilized in the prior art, is realized to the phase of optical signal, amplitude, intensity and polarization state
Modulation, and there are no the modulation to parameters such as the shooting angle of light and Exit positions.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of optical device and optical system and control systems
System.
A kind of optical device provided according to the present invention has at least two not parallel surfaces, fills out between two surfaces
Fill birefringent material.
Preferably, it is formed with electrode on two surfaces, voltage can be applied.
Preferably, the birefringent material can change according to applied voltage swing and/or voltage action time length
Effective refractive index.
Preferably, the birefringent material is liquid crystal.
Preferably, the liquid crystal uses ECB or VA Mode encapsulations.
Preferably, described two surfaces are formed with alignment film, matching on described two surfaces in face of the side of birefringent material
Alignment direction to film is consistent.
Preferably, surface all or part region is formed with echo area.
Preferably, surface all or part region is formed with anti-reflection film.
Preferably, light incident direction thickness change is prolonged on described two surfaces.
Preferably, the section of waveguide device where described two surfaces is triangle or wedge shape.
A kind of optical system provided according to the present invention further includes light source including an at least optical device,
In, the incident light of the optical device is from light source.
Preferably, the light source is laser.
Preferably, the incident light is directional light or less parallel light.
Preferably, the incident light polarization direction is consistent with alignment direction.
It preferably, further include coupled apparatus, coupled apparatus is optically coupled into the optical device for what light source issued.
Preferably, the coupled apparatus is triangular prism and/or grating device.
It preferably, further include the optical element in optical path.
A kind of control system provided according to the present invention, control or two tables at least one optical device
Face applies electric signal.
Preferably, for muti-piece optical device, control system applies electricity to different optical devices in different time respectively
Pressure, and export synchronization signal and/or the corresponding optical device of control light source input.
Preferably, the electric signal is at least one of fixed voltage, variation voltage, or setting waveform, variation
At least one of waveform.
Preferably, the control system connects light source, and/or receives optical device.
Preferably, the control system applies periodic electric signal to optical device.
Preferably, the sum of the voltage difference that the control system applies two surfaces of optical device within the setting period is 0.
Preferably, the control system exports synchronization signal.
Preferably, the control system has pre-stored data, at least one setting time point output after applying electric signal
Synchronization signal.
Preferably, the synchronization signal is for controlling light source and/or receiving system.
Preferably, the control system uses FPGA, CPLD, AISC, and DSP, CPU are at least one of in GPU, MCU
Chip.
Preferably, the control system also includes FLASH, DDR memory, at least one of ROM memory.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention is by applying alive variation and/or period, so that the outgoing parameter of emergent light changes, realization is swept
Retouch function；Further, synchronizing control to optical device and light source by control system can be improved the quality of scanning.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is the optical device that section of the present invention is wedge shape, and wedge shape is applied on two not parallel surfaces respectively up and down in Fig. 2
The refractive index of making alive V0, V1, medium n0, n1 are different, and incident light enters optical device from the prism of triangle.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
Embodiment 1
A kind of optical scanning device provided according to the present invention, by the effective refraction for changing birefringent medium in device
Rate changes the angle and/or Exit positions of emergent light, realizes the purpose of light beam scanning.The device can be a kind of wave guide
Part, cross sectional shape are triangle or wedge shape.At least tool is there are two surface, and not parallel between two surfaces, the substrate on surface can
To apply voltage, central filler birefringent material (such as liquid crystal), when the electric field of both ends substrate changes, intermediate materials etc.
Effect refractive index can also change, to change exit direction and/or the position of incident device light beam, realize scanning.Apply electricity
Pressure changes Refractive Index of Material can realize (i.e. two kinds of driving methods and its combination) by two methods or their combination.
First method is to apply a voltage, and birefringent material (liquid crystal) can reach a stabilization after a certain period of time for waiting
State, as long as maintaining this voltage, subsequent equivalent refractive index will not change, therefore can open after a certain time
Light source (and synchronous opening receiving device), imports light into device, light can be emitted according to corresponding angle.Change again later described
The value of voltage, then the equivalent refractive index of birefringent material, which emits, changes, and reaches stable after a period of time, is again turned on light source,
It can change the shooting angle of light.
Second method is to apply a fixed voltage, is needed centainly due to can change material arrival settling position
In the reaction time (the often magnitudes of several hundred microseconds to millisecond), the effective refractive index of birefringent material is continuously to become in the process
Change, it is possible to by measured in advance time and refractive index relationship after application of a voltage and birefringent material reaches stable shape
Before state sometime in learn corresponding refractive index at this time, as long as the corresponding time open light source (time of light pulse is past
It, will be fastly more than the material reaction time toward being nanosecond, it is believed that the effective refractive index of material is one fixed within the time period
Value), the emergent light of corresponding angle can be obtained.It, can be in different time in this way before birefringent material reaches stable state
Light source is repeatedly opened on point and receives system, to obtain different angle emergent light and its feedback signal.
Above two driving method can also be combined with each other, such as the voltage successively applied is different, applies in each voltage
In the time that adduction maintains, light source and synchronous receiver part are opened respectively in different time points.
It further include light source in optical scanning device, light source can be laser, such as semiconductor laser (VCSEL, LD etc.)
Or laser array.It can also include other optical devices, such as lens in optical scanning device, lens group is used to collimated light source,
Zoom image etc. further includes beam combiner part (such as Amici prism, devating prism, optical fiber etc.).
Above-mentioned optical scanning device can also cascade use, for increasing scanning angle and/or realizing two-dimensional scanning.
Above-mentioned optical device can be with muti-piece parallel connection, to solve monolithic device at the time point that cannot achieve modulation
(such as after certain block device applies certain voltage, equal materials is needed to return to original state in some cases, or when using the
A kind of driving method, when material is during reaction in some cases), it still can pass through another piece of device of driving and correspondence
By light source open realize scanning.For example, having A, B totally 2 pieces of devices in system, two light sources are respectively corresponded, the B when A work
During reaction or recovery, open the corresponding light source of A at this time and export synchronization signal, when B work A be in reaction or
During recovery, open the corresponding light source of B and simultaneously export synchronization signal, so by temporal difference may be implemented sometimes
Carve the periodical output that can realize rule.
Embodiment 2 can be interpreted as the change case and preference of embodiment 1 by those skilled in the art.
Embodiment 2
A kind of device for optical scanner, is wedge-shaped waveguide, and upper substrate, lower substrate (abbreviation upper and lower base plate) use ITO
Glass, it is not parallel between upper and lower base plate, and it is formed with electrode.It is prepared with PI film on the inside of substrate, it is fixed to carry out orientation by rubbing manipulation
Specific direction friction (is pressed to the PI film on glass substrate using felt) in position, and the alignment direction of upper and lower base plate is consistent (ecb mode),
Processing is sealed to four sides, and in central filler liquid crystal material.With folding same or similar with lower substrate on the lower substrate of device
The optical cement for penetrating rate is bonded with the triangular prism of same or similar refraction materials production, is imported incident light by triangular prism
Waveguide.Light source uses semiconductor laser, such as the laser of 808nm or 1550nm, polarization direction when laser light incident waveguide
It is set as consistent with substrate surface alignment direction (consistent with the long axis direction of liquid crystal material when being not powered on).When light incidence waveguide
Afterwards, multiple total reflection can be undergone in device, since waveguide is wedge shape, enter when light arrives again at same surface after total reflection every time
Firing angle will reduce, its angle will be less than the angle of total reflection after multiple reflections, and finally (can be from upper base from waveguide outgoing
Plate outgoing, can also be emitted from lower substrate, can also be by plating reflectance coating, and the measures such as anti-reflection film limitation light only goes out from a surface
It penetrates.Propagation of the light in waveguide can also being designed to, every process is primary complete using the scheme of outgoing is controlled by plating reflectance coating
The framework that incident angle increases after reflection, i.e. duct thickness increase along optical propagation direction, and shooting angle increases, and help modulating
Transmissivity is improved while shooting angle), it is assumed that when applying 20V voltage liquid crystal material to the incident light of the polarization direction etc.
Effect refractive index will become 1.65 from 1.4 in 500us, and be consecutive variations.Due to refractive index difference, will make in the 500us
The light pulse of interior different time points incidence is at different angles and/or position is emitted from waveguide.Pass through record time and outgoing
The relationship of angle is simultaneously recorded/stored in control system, so that it may which control emits light pulse in the corresponding time, to realize not
With the scanning of the light of angle, if while synchronous reception system, the feedback of different scanning angle can be detected in different time points
Information (such as spatial position that exterior object is judged using TOF method combination launch angle).
Above system is to expand the variation range of the angle of emergence, can also take and plate reflectance coating in some regions of waveguide,
It is emitted incident light can not in a certain region having reached shooting angle, and be to continue with and propagate a distance in the waveguide
(angle is decreased or increased) could be emitted after reaching the Exit positions designed.The light part quilt that should be emitted in design in order to prevent
Waveguide substrate surface reflection echo leads (angle has been less than the angle of total reflection, and part is emitted, and part is reflected), can also be in waveguide substrate
Surface or portion surface area plate anti-reflection film, the partial region of the ratio or another surface that increase emergent light also plates
Anti-reflection film makes the light that should be all emitted in design, in practice by the reflected part energy of waveguide surface at another
(due to exit surface difference, this part is easily handled, such as is covered, or by another for outgoing or most of outgoing on surface
A shooting angle utilization), in this way, energy is very weak when this part luminous energy again returns to first surface, it is not enough to original
It is interfered with the light that target angle is emitted.
The incident light of above system can be one or several hot spots, one or several line segment shaped light beam, corresponding to be emitted
Scanning light beam also can be at forms such as point, dot matrix, line, linear arrays.In order to achieve the purpose that beam shaping, light may include in light source
Source shaping device, such as lens etc..Light source can be one or more lasers, can also be comprising combining device in light source, will
The combiner that light beam imports coupling optical path or issues multiple lasers.
Can also be comprising other optical devices, such as lens system in above system, it can be by the light of scanner output
Angle enlargement or diminution, or reception system is also coupled into optical path, it is made into the received coaxial system of transmitting.
In addition, using liquid crystal as intermediate layer material when, the driving of liquid crystal needs to keep DC balance (in certain time week
The sum of both end voltage is that 0), control system can use the driving strategy of DC balance to upper and lower base plate in phase.Such as the last week
Phase applies 15V voltage to upper substrate, and lower substrate applies 0V voltage, and next period to upper substrate time 0V voltage, applies lower substrate
Add 15V voltage.Or upper substrate applies 1,2,3 to 10V voltage respectively in each cycle in preceding 10 periods, lower substrate voltage is
0V, upper substrate voltage is 0 in rear 10 periods, applies 1,2,3 in lower substrate each cycle respectively to 10V voltage, realizes that direct current is flat
Weighing apparatus.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (28)
1. a kind of optical device, which is characterized in that there are at least two not parallel surfaces, filled between two surfaces birefringent
Material.
2. optical device according to claim 1, which is characterized in that be formed with electrode on two surfaces, voltage can be applied.
3. optical device according to claim 2, which is characterized in that the birefringent material can be according to applied voltage
Size and/or voltage action time length change effective refractive index.
4. optical device according to claim 1, which is characterized in that the birefringent material is liquid crystal.
5. optical device according to claim 1, which is characterized in that the liquid crystal uses ECB or VA Mode encapsulations.
6. optical device according to claim 1, which is characterized in that described two surfaces face the side of birefringent material
It is formed with alignment film, the alignment direction of the alignment film on described two surfaces is consistent.
7. optical device according to claim 1, which is characterized in that surface all or part region is formed with reflection
Area.
8. optical device according to claim 1, which is characterized in that surface all or part region is formed with anti-reflection
Film.
9. optical device according to claim 1, which is characterized in that prolong the change of light incident direction thickness in described two surfaces
Change.
10. optical device according to claim 1, which is characterized in that the section of waveguide device where described two surfaces
For triangle or wedge shape.
11. a kind of optical system, which is characterized in that including an at least optics device described in any one of claims 1 to 10
Part further includes light source, wherein the incident light of the optical device is from light source.
12. optical system according to claim 11, which is characterized in that the light source is laser.
13. optical system according to claim 11, which is characterized in that the incident light is directional light or less parallel
Light.
14. optical system according to claim 11, which is characterized in that the incident light polarization direction and alignment direction one
It causes.
15. optical system according to claim 11, which is characterized in that further include coupled apparatus, coupled apparatus is by light source
What is issued is optically coupled into the optical device.
16. optical system according to claim 15, which is characterized in that the coupled apparatus be triangular prism and/or
Grating device.
17. optical system according to claim 11, which is characterized in that further include the optical element in optical path.
18. a kind of control system, which is characterized in that control or at least one described in any one of claims 1 to 10
Two surfaces of optical device apply electric signal.
19. control system according to claim 18, which is characterized in that be directed to muti-piece optical device, control system difference
Voltage is applied to different optical devices in different time, and exports synchronization signal and/or the corresponding optics of control light source input
Device.
20. control system according to claim 18, which is characterized in that the electric signal is fixed voltage, variation voltage
At least one of, or at least one of setting waveform, variation waveform.
21. control system according to claim 18, which is characterized in that the control system connects light source, and/or receives
Optical device.
22. control system according to claim 18, which is characterized in that the control system applies the period to optical device
The electric signal of property.
23. control system according to claim 18, which is characterized in that the control system is to two surfaces of optical device
The sum of voltage difference applied within the setting period is 0.
24. control system according to claim 18, which is characterized in that the control system exports synchronization signal.
25. control system according to claim 24, which is characterized in that the control system has pre-stored data, is applying
At least one setting time point after electric signal exports synchronization signal.
26. control system according to claim 24, which is characterized in that the synchronization signal for control light source and/or
Reception system.
27. control system according to claim 18, which is characterized in that the control system uses FPGA, CPLD,
At least one of chip in AISC, DSP, CPU, GPU, MCU.
28. control system according to claim 19, which is characterized in that the control system also includes FLASH, in DDR
It deposits, at least one of ROM memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595554.5A CN109557702B (en) | 2018-12-25 | 2018-12-25 | Photoelectric scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595554.5A CN109557702B (en) | 2018-12-25 | 2018-12-25 | Photoelectric scanner |
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| CN109557702A true CN109557702A (en) | 2019-04-02 |
| CN109557702B CN109557702B (en) | 2022-04-08 |
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| CN201811595554.5A Active CN109557702B (en) | 2018-12-25 | 2018-12-25 | Photoelectric scanner |
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| JPH0634937A (en) * | 1992-05-26 | 1994-02-10 | Samsung Electron Devices Co Ltd | Plasma address type liquid crystal display and driving method |
| CN1216140A (en) * | 1996-12-24 | 1999-05-05 | 皇家菲利浦电子有限公司 | Optical system having increased angular scan range |
| CN105009002A (en) * | 2013-03-01 | 2015-10-28 | 西铁城控股株式会社 | Luminous flux splitting element |
| CN105006656A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Electric control scanning waveguide leaky-wave antenna based on liquid crystal |
| CN105511179A (en) * | 2016-03-03 | 2016-04-20 | 京东方科技集团股份有限公司 | Liquid crystal display |
| US20170110074A1 (en) * | 2014-08-13 | 2017-04-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Array substrate and method for driving the same |
| CN108898998A (en) * | 2018-09-10 | 2018-11-27 | 江苏慧光电子科技有限公司 | Driving method, varying frequency drive method and system, medium and chip |
-
2018
- 2018-12-25 CN CN201811595554.5A patent/CN109557702B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0634937A (en) * | 1992-05-26 | 1994-02-10 | Samsung Electron Devices Co Ltd | Plasma address type liquid crystal display and driving method |
| CN1216140A (en) * | 1996-12-24 | 1999-05-05 | 皇家菲利浦电子有限公司 | Optical system having increased angular scan range |
| CN105009002A (en) * | 2013-03-01 | 2015-10-28 | 西铁城控股株式会社 | Luminous flux splitting element |
| US20170110074A1 (en) * | 2014-08-13 | 2017-04-20 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Array substrate and method for driving the same |
| CN105006656A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Electric control scanning waveguide leaky-wave antenna based on liquid crystal |
| CN105511179A (en) * | 2016-03-03 | 2016-04-20 | 京东方科技集团股份有限公司 | Liquid crystal display |
| CN108898998A (en) * | 2018-09-10 | 2018-11-27 | 江苏慧光电子科技有限公司 | Driving method, varying frequency drive method and system, medium and chip |
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| CN109557702B (en) | 2022-04-08 |
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