WO2014087301A1 - Matrice d'éclairage avec distribution adaptée du rayonnement - Google Patents

Matrice d'éclairage avec distribution adaptée du rayonnement Download PDF

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Publication number
WO2014087301A1
WO2014087301A1 PCT/IB2013/060395 IB2013060395W WO2014087301A1 WO 2014087301 A1 WO2014087301 A1 WO 2014087301A1 IB 2013060395 W IB2013060395 W IB 2013060395W WO 2014087301 A1 WO2014087301 A1 WO 2014087301A1
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WO
WIPO (PCT)
Prior art keywords
array
radiation
radiation elements
view
field
Prior art date
Application number
PCT/IB2013/060395
Other languages
English (en)
Inventor
Mark Carpaij
Stephan Gronenborn
Original Assignee
Koninklijke Philips N.V.
Philips Deutschland Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips N.V., Philips Deutschland Gmbh filed Critical Koninklijke Philips N.V.
Publication of WO2014087301A1 publication Critical patent/WO2014087301A1/fr

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/42—Arrays of surface emitting lasers
    • H01S5/423—Arrays of surface emitting lasers having a vertical cavity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0564—Combinations of cameras with electronic flash units characterised by the type of light source
    • G03B2215/0567—Solid-state light source, e.g. LED, laser
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/19626—Surveillance camera constructional details optical details, e.g. lenses, mirrors or multiple lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06233—Controlling other output parameters than intensity or frequency
    • H01S5/06243—Controlling other output parameters than intensity or frequency controlling the position or direction of the emitted beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
    • H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
    • H01S5/18386—Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface
    • H01S5/18394—Apertures, e.g. defined by the shape of the upper electrode

Definitions

  • the invention relates to the field of illumination devices and methods for camera applications, such as for illuminating a field of view of a camera for surveillance or observation purposes.
  • Camera observation is omnipresent, and is more and more being used for surveillance of traffic, crowds, and security-relevant industry sites.
  • the cameras are equipped with near-infrared illuminators, to be able to observe during nighttime or other low light level conditions as well.
  • near-infrared illuminators to be able to observe during nighttime or other low light level conditions as well.
  • Usually light between 760 and 940 nm is used, since the human eye is hardly or not at all sensitive to light at this wavelength, whereas silicon, of which the light-sensitive camera pixels are made, still has sufficient quantum efficiency.
  • the camera is directly equipped with near-infrared (NIR) illuminators (which are often based on light emitting diodes (LEDs), and in other cases (halogen) lamps are installed on light poles around the observation area.
  • NIR near-infrared
  • LEDs light emitting diodes
  • halogen halogen
  • Illuminators especially when mounted close to the camera, illuminate the field of view (FOV) of the camera.
  • the illuminator itself radiates uniformly or almost uniformly into the scene. Due to spreading of the light beam (in connection with the FOV), the light of the illuminator is spread over a larger area, the larger the travel distance. As a result, the radiance of the objects illuminated by the illuminator decreases, and hence objects at a larger distance will appear darker in the camera image. For example, in case of a front-lid camera, objects that are close to the camera appear much brighter in the picture.
  • a small diaphragm is required to avoid over-exposure, which is disadvantageous in that sensitivity to light of the camera is not fully exploited, thus spilling light of the illuminator and rendering sub-optimal images, in which the background or other objects located further away from the camera are not visible.
  • Fig. 1 shows a schematic diagram indicating actual light levels of a conventional illuminator 310 on ground 300 over a distance of 100 m from the illuminator 310.
  • lux light intensity
  • the relationship is expressed by an inverse square law. The ratio from 100 m to 10 m is thus 100: 1.
  • the illustration in Fig. 1 is for a white light because infrared light cannot be measured in lux. The effect of this law though, affects infrared light in exactly the same way.
  • the array is adapted so that the density or aperture or both of the radiation elements changes in at least one portion of the array, or the emission power of individual ones or clusters of the radiation elements is controlled based on the output image and/or the diaphragm settings of the camera device so as to provide an adapted distribution of radiation.
  • Light distribution of the array can thereby be configured so that less light is sent to brighter objects close to the camera.
  • the diaphragm of the camera can be kept maximally open during every image capture, ensuring that the sensitivity of the camera is always fully used, and no light and thus electrical energy is spoiled.
  • the array may be divided into different zones arranged one after the other along a dimension of the array, wherein each zone has a different density of the radiation elements so that the density decreases or increases in a stepwise manner along said dimension of the array.
  • the radiation power projected on the illuminated area can be stepwise increased or decreased, respectively, along the projection of the dimension.
  • the array may be divided into different zones arranged one after the other along a dimension of the array, wherein each zone has radiation elements with a different aperture size, so that the aperture size decreases or increases in a stepwise manner along the dimension of the array. Similar to the first aspect, the radiation power projected on the illuminated area can be stepwise increased or decreased, respectively, along the projection of the dimension.
  • the array may be provided in an illumination device, wherein a lens may be arranged in front of the array and adapted to project the radiation of the radiation elements to predetermined angles, e.g, of an area to be illuminated.
  • the illumination device can be enhanced to provided an adapted illumination characteristic.
  • the illumination device may comprise a switched transistor matrix for controlling current supplied to the radiation elements of the array.
  • the switched matrix allows an individual voltage-based control of the current flowing through each of the radiation elements and thus the radiation output power of each radiation element.
  • three-dimensional information of a scene of the field of view may be derived from a matrix of controlled currents supplied to the radiation elements.
  • the emission power of the radiation elements may be adjusted so that bright areas of the field of view of the associated camera device receive less radiation power and dark areas of the field of view receive more radiation power, if the diaphragm settings indicate that the diaphragm of the camera device is not fully open. Thereby, it can be ensured that the field of view is illuminated in a manner so that the camera diaphragm can be kept fully open while overexposure is prevented.
  • the above array of radiation elements can be implemented as an integrated or monolithic chip or chip module or chip-set which may be distributed or supplied separately so as to be integrated into various types of illumination devices.
  • the control unit of the illumination device may be implemented by a computer or signal processing device or chip controlled by a software routine or program stored in a memory, written on a computer readable medium, or downloaded from a network, such as the Internet.
  • the software routine or program may comprise program code (i.e. code means) for producing the steps of method claim 11 when run on the computer or signal processing device.
  • the array of claim 1 , the illumination device of claim 7, the method of claim 11 and the computer program product of claim 13 have similar and/or identical preferred embodiments, in particular, as defined in the dependent claims.
  • Fig. 1 shows a schematic diagram indicating actual light levels of a
  • Fig. 2A shows a schematic cross-sectional side view and light output
  • Fig. 2B shows a schematic top view of the illuminator device according to the first embodiment
  • Fig. 3 shows different zones of light projected by the illuminator device of the first embodiment at different distances
  • Fig. 4 shows a schematic top view of an illuminator device according to a second embodiment with different radiator aperture
  • Fig. 5 shows a characteristic of voltage versus current for various radiator elements with different apertures
  • Fig. 6 shows a characteristic of output power versus current for various radiator elements with different apertures
  • Fig. 7 shows a schematic top view of an illuminator device which can be used in a third embodiment
  • Fig. 8 shows a schematic diagram indicating optical paths of a radiator array imaged with a positive lens to a field of view
  • Fig. 9 shows a schematic block diagram of an illumination control system according to the third embodiment.
  • Fig. 10 shows a schematic circuit diagram of a parallel circuit of controllable radiation elements according to the third embodiment.
  • VCSELs vertical-cavity surface-emitting lasers
  • edge-emitting semiconductor lasers also in-plane lasers
  • VCSELs emit the beam perpendicular to the active region of the laser as opposed to parallel as with an edge emitter
  • tens of thousands of VCSELs can be processed simultaneously on a three inch Gallium Arsenide (GaAs) wafer.
  • GaAs Gallium Arsenide
  • the yield can be controlled to a more predictable outcome.
  • Light output of the VCSEL array is provided by mesa structures.
  • a mesa is an elevated area of land with a flat top, surrounded on all sides by steep cliffs.
  • a semiconductor structure with a shape similar to this geological formation is called mesa structure.
  • VCSEL array are modified or controlled, so that they can solve irregularities in apparent brightness of an object in a camera image.
  • the mesa density and/or the mesa aperture is increased in some parts of the array which may be provided on a chip.
  • Additional optics e.g. lens design
  • a control unit may be provided which analyses camera images and the diaphragm setting of the camera, and allows an adjustment of the VCSEL array of the illuminator such that less light is sent to objects close to the camera.
  • the VCSEL array may be used as a NIR illuminator, where the array is designed such that single emitters on the chip or clusters thereof can be controlled externally, e.g., by the control unit.
  • the array may consist by design of thousands (>2000 for a 4 mm chip) single emitters (i.e. radiation elements or radiators). With proper optical design, light from neighboring emitters is mixed, yet small clusters of emitters are projected to different angles in the scene. In this way, more light can be sent to background regions of an illuminated area (e.g., field of view of the camera), illuminating the background strongly for a more even brightness in the whole image. By proper adaption of the light distribution of the array less light is sent to objects close to the camera.
  • FIG. 2A shows a schematic cross-sectional side view and light output characteristic of an illuminator device according to a first embodiment with different density of radiators (i.e. VCSEL mesas) 10 of a VCSEL array 100 (VCSEL chip) and with three different zones A, B and C arranged one after the other in the x-direction indicated in Fig. 2A.
  • Zone A has a higher filling ratio, and thus more active (emitting) area per chip area.
  • Zone B has less active area density, and zone C again less.
  • the density and light intensity (I) is stepwise decreased in the x-direction along the areas A, B and C, as indicated in the lower left diagram of Fig. 2A.
  • the light from neighboring lasers of VCSELs will start to mix.
  • the point pattern of the chip is not visible anymore, since enough light mixing has taken place.
  • the zones A, B and C will have different brightness, since light from different zones has hardly mixed.
  • Fig. 2B shows a schematic top view of the illuminator device according to the first embodiment.
  • the zones A, B and C cover the whole width of the array 100 in the horizontal direction of Fig. 2B (i.e. z-direction in Fig. 2A).
  • Fig. 3 shows different zones of light projected by the illuminator device of the first embodiment of Figs. 2A and 2B at different distances on a ground plane 300, where light from zone A with the highest emitter density travels the longest distance from the VCSEL array 100 and lens 200 to the ground plane. Thereby, with suitable settings, a constant level of brightness can be achieved throughout the three projected zones of light on the ground plane 300.
  • Fig. 4 shows a schematic top view of an illuminator device with a VCSEL array 100 with different radiator apertures according to a second embodiment.
  • the radiator aperture i.e. laser aperture of the VCSEL
  • the radiation density i.e. laser mesa density
  • the chip size can be kept small.
  • VCSEL emitters (or mesas) 12, 14 with different aperture sizes e.g. aperture diameters
  • the apertures are constant along the horizontal direction or rows of the VCSEL array 100, while they change along the vertical direction or columns of the VCSEL array 100.
  • the emitters 12 on the upper row of the VCSEL array 100 have the smallest aperture and the emitters 14 in the lowest row of the VCSEL array 100 have the largest aperture.
  • a p-contact area 20 of the VCSEL chip is shown in Fig. 4. Since the VCSEL emitters 12, 14 (i.e. mesas) share the same p-contact 20 (top) and n-contact (bottom, not shown), they are connect in parallel, and will operate at an identical laser voltage.
  • Fig. 5 shows a characteristic of voltage versus current for various radiator elements (i.e. VCSELs) with different apertures (values 4 ⁇ , 6 ⁇ , 8 ⁇ and 10 ⁇ ). As can be gathered from Fig. 5, lower currents are drawn by radiator elements with smaller apertures.
  • Fig. 6 shows a characteristic of output power versus current for the various radiator elements with different apertures of Fig. 5. As can be gathered from Fig. 6, higher optical output powers can be achieved with radiator elements with larger apertures.
  • Fig. 7 shows a schematic top view of an illuminator with a controllable VCSEL array 110 with VCSEL emitters 10, which can be used in a third embodiment where images and diaphragm setting of a camera are analyzed, and the VCSEL emitters 10 of the illuminator are adjusted.
  • the illuminator may be an NIR illuminator and the VCSEL array 110 is designed such that single VCSEL emitters 10 or clusters thereof on the illuminator chip can be controlled externally.
  • the VCSEL array 110 may consist by design of thousands (>2000 for a 4 mm chip) single VCSEL emitters 10.
  • Fig. 8 shows a schematic diagram indicating optical paths of a radiator array imaged with a positive lens 200 to a field of view.
  • the optical paths of two different exemplary emitters 1, 2 of the VCSEL array 110 of Fig. 7 are shown. It is clear that radiation beams LI of the emitter 1 on top of the array are emitted or projected via the lens 200 to the lower part of the illuminated scene after the focal length f, whereas light beams L2 of the emitter 2 on the bottom of the array are sent to the top of the illuminated scene.
  • emitters on the top portion of the array are controlled to increase their output power, illumination of lower portions of the illuminated scene will be stronger and they will appear brighter to the camera.
  • FIG. 9 shows a schematic block diagram of an illumination control system according to the third embodiment.
  • a camera 500 with an optical system (e.g. lens) 600 takes pictures of a scene which is artificially lit by an illuminator with a VCSEL array 110 and a lens 200 or other optical system.
  • the camera 500 is configured to automatically adapt its diaphragm 700 so as to avoid overexposure of the scene in its field of view.
  • a control unit 400 e.g. a software-controlled microcontroller or microcomputer
  • control unit 400 determines, based on the diaphragm settings, that the diaphragm 700 of the camera 500 is not fully opened, the control unit 400 supplies control signals or control information to the illuminator with the VCSEL array 110 so as to control or adjust the output power of the VCSEL emitters such that bright areas of the illuminated scene receive less light and dark areas receive more light.
  • the illuminator may be adapted to apply less current to those VCSEL emitters projecting their light to the bright areas (e.g. close objects of the scene) and vice versa, in response to the control signal or control information received from the control unit 400.
  • Fig. 10 shows a schematic circuit diagram of a parallel circuit of controllable radiation elements (e.g. laser diodes such as VCSEL emitters) 10 which can be used in the third embodiment.
  • controllable radiation elements e.g. laser diodes such as VCSEL emitters
  • VCSEL array 100 an exemplary and simplified electrical circuit of a portion of the radiator array (e.g. VCSEL array 100) is shown.
  • six laser diodes (e.g. VCSEL emitters) 10 are depicted and connected in parallel. By supplying adjusting currents il to i6, the different lasers diodes 10 will emit an amount of light proportional to the respective current.
  • the VCSEL array 100 may be combined with a switched matrix of transistors or other voltage-controlled semiconductor elements, such that the current through each laser diode (e.g. VCSEL emitter) can be controlled by a respective voltage.
  • the switched matrix example might provide (e.g., by the control unit 400 of Fig. 9) rough three-dimensional (3D) map information of the scene in the field of view. If the laser currents are arranged such that uniform illumination is reached, the matrix of currents corresponds to a rough representation of the 3D scene in front of the camera. This 3D information can be used for various purposes such as control of the camera position and/or viewing direction based on closest objects, or conversion of the 2D camera image into a 3D image.
  • an illumination device and method of illuminating a predetermined field of view have been described, wherein an array of radiation elements solves irregularities in apparent brightness of an object in a camera image by providing an adapted distribution of radiation towards the field of view. This is achieved by increasing or decreasing density and/or aperture of radiation elements in some parts of the array or by controlling emission power of single radiation elements or clusters thereof.
  • a suitable design of a lens in front of the array it can be ensured that the radiation of these radiation elements is projected to angles which reach further in the scene, and thus lead to a camera image with constant brightness.
  • the invention is not limited to the disclosed embodiments. It can be applied in any field of illumination devices or illumination arrays with all types of radiation elements.
  • the different apertures or densities of the radiation elements may be achieved by lens systems or other optics by which the light distribution generated by the array can be modified.
  • the control unit may be integrated in the camera or in the illuminator. Moreover, the illuminator may be integrated in the camera together with the control unit.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Stroboscope Apparatuses (AREA)
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Abstract

La présente invention concerne un dispositif d'éclairage et un procédé d'éclairage d'un champ de vision prédéterminé, une matrice (100) d'éléments rayonnants corrigeant les irrégularités de la luminosité apparente d'un objet dans l'image d'une caméra en réalisant une distribution adaptée du rayonnement en direction du champ de vision. Cela est réalisé en augmentant ou en diminuant la densité et/ou l'ouverture des éléments rayonnants dans certaines parties de la matrice ou en commandant la puissance d'émission des éléments rayonnants individuels ou les grappes de ceux-ci. Une construction appropriée d'une lentille (200) à l'avant de la matrice (100) permet de garantir que le rayonnement de ces éléments rayonnants est projeté à des angles qui pénètrent plus loin dans la scène et donne ainsi lieu à une image de caméra ayant une luminosité constante.
PCT/IB2013/060395 2012-12-05 2013-11-26 Matrice d'éclairage avec distribution adaptée du rayonnement WO2014087301A1 (fr)

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US201261733530P 2012-12-05 2012-12-05
US61/733,530 2012-12-05

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CN106412434A (zh) * 2016-10-11 2017-02-15 中国人民解放军陆军军官学院 一种激光助视成像图像亮度与焦距自适应的方法
WO2018119345A1 (fr) * 2016-12-23 2018-06-28 Lumileds Llc Compensation de vignettage
KR20190099044A (ko) * 2016-12-23 2019-08-23 루미레즈 엘엘씨 비네팅에 대한 보상
US10416289B2 (en) 2015-02-19 2019-09-17 Philips Photonics Gmbh Infrared laser illumination device
CN110940995A (zh) * 2019-11-08 2020-03-31 复旦大学 一种天基空间的感知装置及方法
WO2020184638A1 (fr) * 2019-03-14 2020-09-17 Ricoh Company, Ltd. Dispositif de source de lumière, dispositif de détection et appareil électronique
WO2020224811A1 (fr) * 2019-05-09 2020-11-12 Lumileds Holding B.V. Dispositif électroluminescent
EP3627638A4 (fr) * 2017-05-19 2021-04-07 LG Innotek Co., Ltd. Diode laser
US20210320478A1 (en) * 2018-09-04 2021-10-14 Ams Sensors Asia Pte. Ltd. Linear vcsel arrays
CN113614604A (zh) * 2019-03-14 2021-11-05 株式会社理光 光源装置、检测装置和电子设备
CN113725722A (zh) * 2020-05-24 2021-11-30 苹果公司 图案化和泛光照明的投射

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EP1818685A1 (fr) * 2006-02-14 2007-08-15 Takata Corporation Système de détection optique pour gagner des informations sur un objet occupant un siège de véhicule
JP2008311499A (ja) * 2007-06-15 2008-12-25 Ricoh Co Ltd 面発光レーザアレイ、光走査装置、画像形成装置、光伝送モジュール及び光伝送システム
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EP1818685A1 (fr) * 2006-02-14 2007-08-15 Takata Corporation Système de détection optique pour gagner des informations sur un objet occupant un siège de véhicule
JP2008311499A (ja) * 2007-06-15 2008-12-25 Ricoh Co Ltd 面発光レーザアレイ、光走査装置、画像形成装置、光伝送モジュール及び光伝送システム
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Cited By (22)

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US10416289B2 (en) 2015-02-19 2019-09-17 Philips Photonics Gmbh Infrared laser illumination device
CN106412434A (zh) * 2016-10-11 2017-02-15 中国人民解放军陆军军官学院 一种激光助视成像图像亮度与焦距自适应的方法
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