WO2022149333A1 - 受光装置および通信装置 - Google Patents
受光装置および通信装置 Download PDFInfo
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- WO2022149333A1 WO2022149333A1 PCT/JP2021/039348 JP2021039348W WO2022149333A1 WO 2022149333 A1 WO2022149333 A1 WO 2022149333A1 JP 2021039348 W JP2021039348 W JP 2021039348W WO 2022149333 A1 WO2022149333 A1 WO 2022149333A1
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- light
- light receiving
- optical signal
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- control element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0232—Optical elements or arrangements associated with the device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
- H01L31/10—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors characterised by potential barriers, e.g. phototransistors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
Definitions
- the present disclosure relates to a light receiving device or the like that receives a spatial optical signal.
- optical space communication optical signals propagating in space (hereinafter, also referred to as spatial optical signals) are transmitted and received without using a medium such as an optical fiber.
- a condenser lens as large as possible is required.
- a photodiode having a small capacitance is required for high-speed communication. Since such a photodiode has a very small light receiving surface, it is difficult to collect spatial optical signals coming from various directions toward the light receiving surface with a large condensing lens.
- Patent Document 1 discloses a light receiving device that filters condensed light.
- the apparatus of Patent Document 1 includes a first condensing lens, a collimating lens, a bandpass filter, and a light receiving element.
- the collimating lens has a focal length shorter than the focal length of the first condenser lens, and converts the light focused by the condenser lens into parallel light.
- the parallel light from the collimated lens is incident perpendicular to the filter surface of the bandpass filter.
- the light transmitted through the bandpass filter that transmits only the wavelength of the incident light is received by the light receiving element.
- Patent Document 1 a second condensing lens that condenses light that has passed through a bandpass filter is arranged, or an aperture is arranged at the focal position of the condensing lens, so that the light is condensed by the condensing lens.
- a configuration is disclosed that facilitates light guidance to a light receiving element.
- Patent Document 1 discloses a mechanism for adjusting a condenser lens or an aperture to an optimum position by moving a condenser lens or an aperture in three axial directions according to an incident angle of light.
- the light that has passed through the bandpass filter is focused on the second condenser lens, or the condenser lens or aperture is adjusted to the optimum position according to the incident angle of the light. Allows spatial light to be guided to the light receiving element.
- the intensity of the light guided to the light receiving element changes according to the incident angle of the spatial light. Therefore, in the method of Patent Document 1, the spatial light cannot be efficiently received depending on the arrival direction of the spatial light.
- An object of the present disclosure is to provide a light receiving device or the like that can efficiently receive a spatial optical signal arriving from an arbitrary direction.
- the light receiving device of one aspect of the present disclosure includes a condenser lens that receives a spatial light signal, and a light ray control element that emits an optical signal derived from the spatial light signal condensed by the condenser lens toward a predetermined region.
- a light receiving element is provided, which is arranged with a light receiving unit facing a predetermined area and receives an optical signal.
- the line showing the trajectory of light in the drawing is conceptual and does not accurately represent the actual traveling direction or state of light.
- changes in the traveling direction and state of light due to refraction, reflection, diffusion, etc. at the interface between air and a substance may be omitted, or the luminous flux may be represented by a single line.
- the light receiving device of the present embodiment is used for optical space communication in which optical signals propagating in space (hereinafter, also referred to as spatial optical signals) are transmitted and received without using a medium such as an optical fiber.
- the light receiving device of the present embodiment may be used for applications other than optical space communication as long as it is used for receiving light propagating in space.
- the spatial optical signal is regarded as parallel light because it comes from a position sufficiently distant.
- FIG. 1 is a conceptual diagram showing an example of the configuration of the light receiving device 10 of the present embodiment.
- the light receiving device 10 includes a condenser lens 11, a light ray control element 13, and a light receiving element 15.
- 2 and 3 are conceptual diagrams for explaining an example of the locus of light received by the light receiving device 10.
- 1 and 2 are views of the internal configuration of the light receiving device 10 as viewed from the side.
- FIG. 3 is a perspective view of the internal configuration of the light receiving device 10 as viewed diagonally from the front.
- the condensing lens 11 is an optical element that condenses a spatial optical signal arriving from the outside.
- the light derived from the spatial light signal collected by the condenser lens 11 is condensed toward the incident surface of the light ray control element 13.
- the light derived from the spatial optical signal condensed by the condenser lens 11 is called an optical signal.
- the condenser lens 11 can be made of a material such as glass or plastic.
- the condenser lens 11 is realized by a material such as quartz.
- the spatial optical signal is light in the infrared region (hereinafter, also referred to as infrared rays)
- the condenser lens 11 may be realized by a silicon, germanium, or caucogenide-based material.
- the material of the condenser lens 11 is not limited as long as it can refract and transmit light in the wavelength region of the spatial optical signal.
- the light ray control element 13 is arranged after the condenser lens 11.
- the light ray control element 13 is arranged so that its incident surface faces the exit surface of the condenser lens 11.
- the optical signal incident from the incident surface of the light ray control element 13 is emitted from the emitting surface toward a predetermined region. That is, the light signal incident on the light ray control element 13 is controlled in its emission direction and is emitted toward the light receiving unit 150 of the light receiving element 15 arranged in a predetermined region.
- the spatial optical signal A and the spatial optical signal B arriving from different directions are incident on the condenser lens 11.
- the optical signals derived from the spatial optical signal A and the spatial optical signal B are condensed by the condenser lens 11 and incident on different regions (also referred to as ray control regions) of the light ray control element 13.
- the light ray control element 13 emits an optical signal incident on an arbitrary light ray control region toward the same predetermined region.
- the optical signals derived from the spatial optical signal A and the spatial optical signal B are received by the light receiving element 15 arranged with the light receiving unit 150 directed to the predetermined region.
- the light ray control element 13 is realized by a near-field diffractive optical element, a hologram element, a reflection type diffractive optical element, or the like.
- the light ray control element 13 is not limited to the above example as long as it can emit an optical signal incident from the incident surface toward a predetermined region where the light receiving unit 150 of the light receiving element 15 is located.
- FIG. 4 is a cross-sectional view showing an example of a near-field diffractive optical element (near-field diffractive optical element 131) that realizes the light ray control element 13. Submicron-order irregularities are formed on the exit surface of the near-field diffractive optical element 131.
- the near-field diffractive optical element 131 of FIG. 4 conceptually depicts an element that realizes the light ray control element 13, and is not drawn according to the scale of the actual unevenness.
- the near-field diffractive optical element 131 guides the optical signal condensed by the condenser lens 11 to a predetermined region in which the light receiving portion 150 of the light receiving element 15 is arranged.
- the light receiving element 15 is arranged after the light ray control element 13.
- the light receiving element 15 has a light receiving unit 150 that receives an optical signal emitted from the light ray controlling element 13.
- the light receiving element 15 is arranged so that the light receiving unit 150 faces the emission surface of the light ray control element 13.
- the light receiving element 15 is arranged so that the light receiving unit 150 is located in a predetermined region.
- the optical signal emitted from the light ray control element 13 is received by the light receiving unit 150 of the light receiving element 15 located in a predetermined region.
- the light receiving element 15 receives light in the wavelength region of the optical signal to be received.
- the light receiving element 15 receives an optical signal in an infrared region.
- the light receiving element 15 receives, for example, an optical signal having a wavelength in the 1.5 ⁇ m (micrometer) band.
- the wavelength band of the optical signal received by the light receiving element 15 is not limited to the 1.5 ⁇ m band.
- the wavelength band of the optical signal received by the light receiving element 15 can be arbitrarily set according to the wavelength of the spatial optical signal transmitted from the light transmitting device (not shown).
- the wavelength band of the optical signal received by the light receiving element 15 may be set to, for example, a 0.8 ⁇ m band, a 1.55 ⁇ m band, or a 2.2 ⁇ m band.
- the wavelength band of the optical signal received by the light receiving element 15 may be, for example, a 0.8 to 1 ⁇ m band.
- the shorter the wavelength band of the optical signal the smaller the absorption by moisture in the atmosphere, which is advantageous for optical space communication during rainfall.
- the light receiving element 15 may receive an optical signal in the visible region. Further, when the light receiving element 15 is saturated with intense sunlight, the optical signal derived from the spatial optical signal cannot be read. Therefore, a color filter that selectively passes light in the wavelength band of the spatial optical signal may be installed in front of the light receiving element 15.
- the light receiving element 15 converts the received optical signal into an electric signal.
- the light receiving element 15 outputs the converted electrical signal to a decoder (not shown).
- the light receiving element 15 can be realized by an element such as a photodiode or a phototransistor.
- the light receiving element 15 is realized by an avalanche photodiode.
- the light receiving element 15 realized by an avalanche photodiode can support high-speed communication.
- the light receiving element 15 may be realized by an element other than a photodiode, a phototransistor, or an avalanche photodiode as long as the optical signal can be converted into an electric signal.
- the light receiving portion 150 of the light receiving element 15 is as small as possible.
- the light receiving portion 150 of the light receiving element 15 has a light receiving surface having a diameter of about 0.1 to 0.3 mm (millimeters).
- the optical signal collected by the condenser lens 11 is condensed within a certain range depending on the arrival direction of the spatial optical signal, it cannot be condensed in a predetermined area where the light receiving unit 150 of the light receiving element 15 is arranged. Can not.
- the light signal focused by the condenser lens 11 is received by the light receiving element 15 by using the light ray control element 13 that selectively guides the light signal focused by the condenser lens 11 to a predetermined region. It leads to a predetermined area where the unit 150 is located. Therefore, the light receiving device 10 can efficiently guide the spatial optical signal arriving at the incident surface of the condenser lens 11 from an arbitrary direction to the light receiving unit 150 of the light receiving element 15.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, and a light receiving element.
- the condenser lens receives a spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the ray control measure is a near-field diffractive optical element that diffracts an optical signal focused by a condenser lens toward a predetermined region.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area. The light receiving element receives an optical signal.
- the light signal collected by the condensing lens is guided to a predetermined area by the light ray control element, so that the spatial light arriving from an arbitrary direction can be efficiently received.
- the light receiving device of the present embodiment includes a light pipe that guides an optical signal emitted from a light ray control element to a light receiving unit of the light receiving element.
- the light pipe is a member that guides an optical signal emitted from a light ray control element to a light receiving portion of the light receiving element.
- FIG. 5 is a conceptual diagram showing an example of the configuration of the light receiving device 20 of the present embodiment.
- the light receiving device 20 includes a condenser lens 21, a light ray control element 23, a light pipe 24, and a light receiving element 25.
- FIG. 5 is a side view of the internal configuration of the light receiving device 20.
- FIG. 6 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 20.
- FIG. 6 is a perspective view of the internal configuration of the light receiving device 20 as viewed diagonally from the front.
- the condensing lens 21 is an optical element that condenses a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 21 is condensed toward the incident surface of the light ray control element 23.
- the condenser lens 21 has the same configuration as the condenser lens 11 of the first embodiment.
- the light ray control element 23 is arranged after the condenser lens 21.
- the light ray control element 23 is arranged so that its incident surface faces the emission surface of the condenser lens 21.
- the optical signal incident from the incident surface of the light ray control element 23 is emitted toward a predetermined region at a close distance.
- the emission direction of the optical signal incident from the incident surface of the light ray control element 23 is controlled, and the optical signal is emitted toward the incident surface of the light pipe 24.
- the light ray control element 23 has the same configuration as the light ray control element 13 of the first embodiment.
- the light pipe 24 is provided in association with the light receiving element 25.
- the light pipe 24 has an incident surface on which a spatial optical signal is incident and an outgoing surface on which an optical signal guided inside the light pipe 24 is emitted.
- the exit surface has a smaller area than the entrance surface.
- the light pipe 24 is arranged so that its incident surface is located in a predetermined region.
- the emission surface of the light pipe 24 is arranged so that the light pipe 24 is in contact with the light receiving portion 250 of the associated light receiving element 25.
- the optical signal emitted from the light emitting surface of the light pipe 24 is incident on the light receiving unit 250 of the light receiving element 25, the light emitting surface of the light pipe 24 and the light receiving unit 250 of the light receiving element 25 may not be in contact with each other. ..
- FIG. 5 shows an example in which the entrance surface and the emission surface are parallel, but the entrance surface and the emission surface may be non-parallel as long as the optical signal can be guided from the entrance surface to the emission surface.
- the light pipe 24 is preferably made of a material that easily transmits light in the wavelength band of spatial light.
- the light pipe 24 can be made of a general optical fiber material.
- the optical signal incident from the incident surface of the light pipe 24 is guided to the exit surface while being reflected by the side surface of the light pipe 24.
- the optical signal guided to the emission surface is emitted from the emission surface.
- Most of the optical signal guided inside the light pipe may be emitted from the exit surface, and may leak when a part of the optical signal is reflected by the side surface.
- the light receiving element 25 is arranged after the light pipe 24.
- the light receiving element 25 has a light receiving unit 250 that receives an optical signal emitted from the light pipe 24.
- the light receiving element 25 is arranged so that the light receiving portion 250 faces the emission surface of the light pipe 24.
- the optical signal emitted from the light pipe 24 is received by the light receiving unit 250 of the light receiving element 25.
- the light receiving element 25 converts the received optical signal into an electric signal.
- the light receiving element 25 outputs the converted electrical signal to a decoder (not shown).
- the light receiving element 25 has the same configuration as the light receiving element 15 of the first embodiment.
- the optical signal can be guided toward the light receiving unit 250 of the light receiving element 25. Therefore, the area of the light receiving portion 250 of the light receiving element 25 can be reduced. Therefore, a light receiving element 25 having the same light receiving efficiency but a small light receiving surface can be applied. For example, if the light pipe 24 is used, the light receiving element 25 having high sensitivity can be adopted although the area of the light receiving portion 250 is small.
- FIG. 7 is a side view of the first example (light pipe 241) of the light pipe 24.
- the light pipe 241 is formed in a tapered shape so as to narrow from the entrance surface to the exit surface.
- the light pipe 241 is made of a material that transmits light in the wavelength band of an optical signal.
- the side surface of the light pipe 241 reflects light in the wavelength band of the optical signal.
- a reflector that reflects light in the wavelength band of the optical signal may be installed on the outside of the side surface of the light pipe 241.
- FIG. 8 is a side view of the second example (light pipe 242) of the light pipe 24.
- the light pipe 242 includes a light guide portion 2421 on the incident side and an exit portion 2422 on the exit side.
- the light guide unit 2421 and the emission unit 2422 are integrated.
- the light guide portion 2421 is formed in a tapered shape so as to narrow from the incident surface toward the exit portion 2422.
- the emitting portion 2422 has a spherical or ellipsoidal shape.
- the end of the emission portion 2422 (the right end portion of the light pipe 242 in FIG. 8) is the emission surface.
- the connection portion between the light guide unit 2421 and the emission unit 2422 is configured so as not to affect the propagation of the optical signal.
- FIG. 8 In the light pipe 241 (FIG.
- the angle of the taper becomes steep, so that the light signal is easily radiated from the incident surface due to the reflection on the side surface.
- the light pipe 242 (FIG. 8) since the light emitting portion 2422 is provided, the taper of the light guide portion 2421 does not have to be steep. Therefore, the light pipe 242 (FIG. 8) is easier to efficiently guide the optical signal to the small light receiving element 25 of the light receiving unit 250 than the light pipe 241 (FIG. 7).
- the emission unit 2422 may be formed in a shape other than a sphere or an ellipsoid as long as the optical signal entering from the light guide unit 2421 can be easily guided toward the emission surface.
- the light pipe 242 is made of a material that transmits light in the wavelength band of an optical signal.
- the side surface of the light guide unit 2421 and the portion other than the emission surface of the emission unit 2422 reflect light in the wavelength band of the optical signal.
- a reflector that reflects light in the wavelength band of an optical signal may be installed on a portion other than the side surface of the light pipe 242 and the emission surface of the emission unit 2422.
- the incident surface of the light pipe 241 and the light pipe 242 may be provided with an antireflection layer according to the wavelength band of the optical signal. If an antireflection layer is provided on the incident surface, the optical signal reflected on the incident surface can be reduced. Further, a color filter for selectively passing light in the wavelength band of the optical signal may be provided on the incident surface of the light pipe 241 and the light pipe 242. If a color filter is provided on the incident surface, the light in the wavelength band of the optical signal is selectively guided to the light receiving portion 250 of the light receiving element 25, so that the noise component contained in the optical signal can be removed.
- FIG. 9 is a side view of the third example (light pipe 243) of the light pipe 24.
- the inside of the light pipe 243 is hollow.
- the entrance surface and the exit surface of the light pipe 243 are open.
- the side surface of the light pipe 243 reflects light in the wavelength band of the optical signal.
- a reflector that reflects light in the wavelength band of an optical signal may be installed inside the side surface of the light pipe 243.
- the main body of the light pipe 243 may be made of a material that transmits light in the wavelength band of the optical signal, and a reflector that reflects the optical signal may be installed on the side surface of the light pipe 243.
- the optical signal reflected inside the light pipe 243 is emitted from the emission surface and is received by the light receiving unit 250 of the light receiving element 25. Since the optical signal of the light pipe 243 is not attenuated inside the light pipe 243, the intensity of the optical signal reaching the light receiving portion 250 of the light receiving element 25 is higher than that of the light pipes 241 to 242 (FIGS. 7 to 8).
- FIG. 10 is a side view of a fourth example (light pipe 244) of the light pipe 24.
- the inside of the light pipe 244 is hollow.
- the entrance surface and the exit surface of the light pipe 244 are open.
- a directional light guide body 284 that directionally guides light in the wavelength band of an optical signal toward an emission surface is arranged on the inner side surface of the light pipe 244.
- the directional light guide body 284 directionally guides the optical signal incident from the incident surface toward the exit surface.
- the optical signal is shown to be reflected on the surface of the directional light guide 284.
- the directional light guide body 284 directionally guides an optical signal toward an exit surface by reflecting at a reflection angle larger than the incident angle.
- the optical signal that has entered the directional light guide 284 may be configured to propagate inside the directional light guide 284 and be emitted from an exit surface directed to the light receiving portion 250 of the light receiving element 25. ..
- the optical signal reflected on the inner surface may return to the incident surface side and may not reach the light receiving element 25.
- the optical signal entering from the incident surface is directionally guided toward the light receiving element 25. Therefore, it becomes difficult for the optical signal to return to the incident surface side, and the light receiving efficiency of the light receiving element 25 is improved.
- the directional light guide body 284 has a reflection structure including at least one reflecting surface that reflects an optical signal incident from an incident surface toward an emitting surface.
- the reflective structure is formed of a material that reflects light in the wavelength band of the optical signal.
- the reflective structure can be formed of a material such as metal.
- the material of the reflection structure is not particularly limited as long as it can reflect light in the wavelength band of the optical signal.
- the directional light guide 284 may be realized by a reflective diffraction grating (also referred to as a diffraction grating array) having a structure in which a plurality of gratings having a height on the order of micrometers are arranged.
- the diffraction grating array diffracts the optical signal so that the optical signal incident from the upper surface of the directional light guide 284 travels toward the exit surface.
- a diffraction grating array can be realized by a blazed diffraction grating or a holographic diffraction grating.
- the diffraction grating array is preferably adjusted in grid spacing so that the optical signal travels toward the exit surface.
- FIG. 11 is a side view of the fifth example (light pipe 245) of the light pipe 24.
- the inside of the light pipe 245 is hollow.
- the entrance surface and the exit surface of the light pipe 245 are open.
- a directional light guide body 285 that directionally guides light in the wavelength band of the optical signal toward the exit surface is arranged on the inner side surface of the light pipe 245 on the incident surface side.
- the directional light guide body 285 has the same configuration as the directional light guide body 284 of the fourth example (FIG. 10). Similar to the third example (FIG. 9), light in the wavelength band of the optical signal is reflected on the inner side surface of the light pipe 245 on the emission surface side.
- a reflector that reflects light in the wavelength band of the optical signal may be installed inside the light pipe 243 on the emission surface side. Similar to the fourth example (FIG. 10), the directional light guide body 285 directionally guides the optical signal incident from the incident surface toward the exit surface. The directional light guide body 285 directionally guides an optical signal toward an exit surface by reflecting at a reflection angle larger than the incident angle. The optical signal emitted from the directional light guide 285 is reflected inside the emission surface side of the light pipe 245 and is emitted from the emission surface. The optical signal emitted from the emission surface is received by the light receiving unit 250 of the light receiving element 25.
- the optical signal reflected several times inside the light pipe 245 may return to the incident surface side.
- the optical signal incident on the light pipe 245 first enters the directional light guide body 285 and is directionally guided toward the light receiving unit 250, so that the possibility of returning to the incident surface side is reduced.
- FIGS. 7 to 11 are examples, and the configuration of the light pipe 24 is not limited to those forms.
- the light pipe may be configured by arbitrarily combining the configurations of FIGS. 7 to 11.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, a light pipe, and a light receiving element.
- the condenser lens receives a spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the light pipe guides the optical signal emitted from the light ray control element to a light receiving unit arranged in a predetermined region.
- the light pipe has a hollow structure and has a directional light guide body that directionally guides an optical signal toward a light receiving portion arranged in a predetermined region at least in the vicinity of the incident surface on the inner surface. ..
- the light receiving element is arranged so that the light receiving portion faces a predetermined area.
- the light receiving element receives an optical signal.
- the light signal condensed by the condensing lens is guided to the light receiving portion of the light receiving element via the light pipe, so that the optical signal derived from the spatial optical signal is more efficient. It can receive light well.
- the light receiving device of the present embodiment is used in a situation where the direction in which the spatial optical signal arrives is limited to some extent.
- the light receiving device of the present embodiment includes an elongated light ray control element set according to the arrival direction of the spatial optical signal.
- the arrival direction of the spatial optical signal is limited to the horizontal direction, and the shape of the light ray control element is elongated in the horizontal direction according to the arrival direction.
- the light receiving device of the present embodiment may be combined with the light pipe of the second embodiment.
- FIG. 12 is a conceptual diagram showing an example of the configuration of the light receiving device 30 of the present embodiment.
- the light receiving device 30 includes a condenser lens 31, a light ray control element 33, and a light receiving element 35.
- FIG. 12 is a side view of the internal configuration of the light receiving device 30.
- FIG. 13 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 30.
- FIG. 13 is a perspective view of the internal configuration of the light receiving device 30 as viewed diagonally from the front.
- the condensing lens 31 is an optical element that condenses a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 31 is condensed toward the incident surface of the light ray control element 33.
- the condenser lens 31 has the same configuration as the condenser lens 11 of the first embodiment.
- the condensing lens 31 may be configured to condense light according to the shape of the light ray control element 33.
- the light ray control element 33 is arranged after the condenser lens 31.
- the light ray control element 33 is arranged so that its incident surface faces the exit surface of the condenser lens 31.
- the light ray control element 33 is set in a shape that matches the arrival direction of the spatial optical signal. For example, when a spatial light signal arrives from the horizontal direction, the light ray control element 33 is set to have a long axis in the horizontal direction and a short axis in the vertical direction. For example, when a spatial optical signal arrives from a direction perpendicular to the horizontal plane (hereinafter referred to as a vertical direction), the ray control element 33 has a shape having a long axis in the vertical direction and a short axis in the horizontal direction. Set. The shape of the light ray control element 33 may be set according to the arrival direction of the spatial optical signal.
- the optical signal incident from the incident surface of the light ray control element 33 is emitted toward a predetermined region at a close distance.
- the emission direction of the optical signal incident from the incident surface of the light ray control element 33 is controlled, and the optical signal is emitted toward the light receiving unit 350 of the light receiving element 35.
- the light ray control element 33 has the same configuration as the light ray control element 13 of the first embodiment except for the shape.
- the light receiving element 35 is arranged after the light ray control element 33.
- the light receiving element 35 has a light receiving unit 350 that receives an optical signal emitted from the light ray controlling element 33.
- the light receiving element 35 is arranged so that the light receiving unit 350 faces the emission surface of the light ray control element 33.
- the optical signal emitted from the light ray control element 33 is received by the light receiving unit 350 of the light receiving element 35.
- the light receiving element 35 converts the received optical signal into an electric signal.
- the light receiving element 35 outputs the converted electrical signal to a decoder (not shown).
- the light receiving element 35 has the same configuration as the light receiving element 15 of the first embodiment.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, and a light receiving element.
- the condenser lens receives a spatial optical signal.
- the light ray control element has a shape that matches the arrival direction of the spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area.
- the light receiving element receives an optical signal.
- the light receiving device of the present embodiment by using a light ray control element having a shape matched to the arrival direction of the spatial optical signal, it is possible to efficiently receive a spatial optical signal having a limited arrival direction.
- the arrival direction of the spatial optical signal from the communication target is limited to the horizontal direction, the vertical direction, or the like, it is not necessary to receive the light arriving from a direction different from those.
- the arrival direction of the spatial optical signal is limited to the horizontal direction
- the shape of the light ray control element is elongated along the horizontal direction according to the arrival direction.
- the shape of the light ray control element may be elongated along the vertical direction according to the arrival direction.
- the light arriving from a direction different from the arriving direction of the spatial optical signal from the communication target can be regarded as a noise component or a disturbing component. Therefore, according to the present embodiment, since the light of the noise component and the disturbing component is not received, the spatial optical signal from the communication target can be received more efficiently.
- the light receiving device of the present embodiment includes a light ray control element that diffracts an optical signal collected by a condenser lens and reflects it to a predetermined region to guide the light signal.
- a light ray control element that diffracts an optical signal collected by a condenser lens and reflects it to a predetermined region to guide the light signal.
- an example including an elongated ray control element set according to the arrival direction of the spatial optical signal will be described, but the ray control element capable of corresponding to the spatial optical signal arriving from an arbitrary direction (No. 1). 1) may be applied.
- the light receiving device of the present embodiment may be combined with the light pipe of the second embodiment.
- FIG. 14 is a conceptual diagram showing an example of the configuration of the light receiving device 40 of the present embodiment.
- the light receiving device 40 includes a condenser lens 41, a light ray control element 43, and a light receiving element 45.
- FIG. 14 is a side view of the internal configuration of the light receiving device 40.
- FIG. 15 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 40.
- FIG. 15 is a perspective view of the internal configuration of the light receiving device 40 as viewed diagonally from the front.
- the condenser lens 41 is an optical element that concentrates a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 41 is condensed toward the incident surface of the light ray control element 43.
- the condenser lens 41 has the same configuration as the condenser lens 11 of the first embodiment.
- the condensing lens 41 may be configured to condense light according to the shape of the light ray control element 43.
- the light ray control element 43 is arranged after the condenser lens 41.
- the light ray control element 43 is a reflection type diffractive optical element.
- the light ray control element 43 has a reflecting surface that diffracts and reflects light in the wavelength band of an optical signal.
- the ray control element 43 is realized by LCOS (Liquid Crystal On Silicon).
- the base material of the light ray control element 43 is quartz.
- a reflective layer made of silicon, gold, or the like is formed on the reflective surface of the light ray control element 43.
- the reflective layer formed on the reflective surface of the light ray control element 43 is preferably formed of gold.
- the reflective surface of the light ray control element 43 is arranged so that the optical signal emitted from the condensing lens 41 is reflected toward the light receiving portion 450 of the light receiving element 45.
- the light ray control element 43 is set in a shape that matches the arrival direction of the spatial optical signal. For example, when the spatial optical signal arrives from the horizontal direction, the light ray control element 43 is set to have a long axis in the horizontal direction and a short axis in the vertical direction. For example, when the spatial optical signal arrives from the vertical direction, the light ray control element 43 is set to have a long axis in the vertical direction and a short axis in the horizontal direction.
- the shape of the light ray control element 43 may be set according to the arrival direction of the spatial optical signal.
- the shape of the light ray control element 43 is not particularly limited when it is configured to correspond to a spatial optical signal arriving from an arbitrary direction.
- the optical signal collected by the condenser lens 41 is incident on the reflecting surface of the light ray control element 43.
- the optical signal incident on the reflecting surface of the light ray control element 43 is diffracted and reflected toward a predetermined region at a close distance.
- the traveling direction of the optical signal diffracted / reflected by the reflecting surface of the light ray control element 43 is controlled, and the light signal is emitted toward the light receiving unit 450 of the light receiving element 45.
- the light receiving element 45 is arranged after the light ray control element 43.
- the light receiving element 45 has a light receiving unit 450 that receives an optical signal reflected by the light ray controlling element 43.
- the light receiving element 45 is arranged so that the light signal reflected by the light ray controlling element 43 is received by the light receiving unit 450.
- the optical signal reflected by the light ray control element 43 is received by the light receiving unit 450 of the light receiving element 45.
- the light receiving element 45 converts the received optical signal into an electric signal.
- the light receiving element 45 outputs the converted electrical signal to a decoder (not shown).
- the light receiving element 45 has the same configuration as the light receiving element 15 of the first embodiment.
- FIG. 16 is a conceptual diagram for explaining a modified example of the light receiving device 40 of the present embodiment.
- the light receiving device of the modified example of FIG. 16 includes a light ray control element 43-2 curved in a curved shape.
- the light ray control element 43-2 is curved according to a curved surface or a curve in which the position of the light receiving portion 450 of the light receiving element 45 is the focal point.
- An optical signal incident on a position away from the center of the light ray control element 43 (FIG. 15) is not reflected toward the position (predetermined region) of the light receiving unit 450 of the light receiving element 45, so that the light signal is not received by the light receiving element 45.
- the light ray control element 43-2 (FIG.
- the light ray control element 43-2 (FIG. 16) has a curved shape, so that the optical signal is incident at an angle close to vertical incidence with respect to the incident surface. Therefore, in the light ray control element 43-2 (FIG. 16), the optical signal incident at a position away from the center is also reflected toward the position (predetermined region) of the light receiving portion 450 of the light receiving element 45, so that the light receiving element 45 Can receive light. That is, the light ray control element 43-2 (FIG. 16) can collect a wide range of optical signals on the light receiving unit 450 of the light receiving element 45 as compared with the light ray control element 43 (FIG. 15).
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, and a light receiving element.
- the condenser lens receives a spatial optical signal.
- the light ray control element is a reflection type diffractive optical element that reflects an optical signal focused by a condenser lens toward a predetermined region.
- the light ray control element is a reflection type diffractive optical element that diffracts and reflects an optical signal derived from a spatial light signal condensed by a condenser lens toward a predetermined region.
- the ray control element has a curved shape having a focal point in a predetermined area.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area.
- the light receiving element receives an optical signal.
- the light signal collected by the condensing lens is reflected by the light ray control element so as to be guided to a predetermined region, so that the spatial optical signal arriving from an arbitrary direction is efficiently received. can.
- the light receiving device of the present embodiment includes a fiber bundle that guides an optical signal emitted from a light ray control element to a light receiving unit of the light receiving element.
- the fiber bundle is a member that guides an optical signal emitted from a light ray control element to a light receiving portion of the light receiving element.
- FIG. 17 is a conceptual diagram showing an example of the configuration of the light receiving device 50 of the present embodiment.
- the light receiving device 50 includes a condenser lens 51, a light ray control element 53, a fiber bundle 54, and a light receiving element 55.
- FIG. 17 is a side view of the internal configuration of the light receiving device 50.
- FIG. 18 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 50.
- FIG. 19 is a perspective view of the fiber bundle 54 included in the light receiving device 50 as viewed diagonally from the front.
- the condensing lens 51 is an optical element that condenses a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 51 is condensed toward the incident surface of the light ray control element 53.
- the condenser lens 51 has the same configuration as the condenser lens 11 of the first embodiment.
- the light ray control element 53 is arranged after the condenser lens 51.
- the light ray control element 53 is arranged so that its incident surface faces the exit surface of the condenser lens 51.
- the optical signal incident from the incident surface of the light ray control element 53 is emitted toward a predetermined region at a close distance.
- the emission direction of the optical signal incident from the incident surface of the light ray control element 53 is controlled, and the optical signal is emitted toward the incident surface of the fiber bundle 54.
- the light ray control element 53 has the same configuration as the light ray control element 13 of the first embodiment.
- the fiber bundle 54 is provided in association with a plurality of light receiving elements 55.
- the fiber bundle 54 has a structure in which a plurality of optical fibers 540 are bundled.
- the fiber bundle 54 has an incident surface on which a spatial optical signal is incident and an outgoing surface on which an optical signal guided inside the fiber bundle 54 is emitted.
- incident ends of a plurality of optical fibers 540 are arranged on the incident surface of the fiber bundle 54.
- a plurality of emission ends of optical fibers 540 are arranged on the emission surface of the fiber bundle 54.
- the bundle of optical fibers 540 constituting the fiber bundle 54 is arranged in association with each of the plurality of light receiving elements 55.
- the fiber bundle 54 may be configured in association with a single light receiving element 55.
- the fiber bundle 54 is arranged so that the incident surface is located in a predetermined region to which the optical signal emitted from the light ray control element 53 is irradiated.
- the emission surface of the fiber bundle 54 is arranged so as to be in contact with the light receiving portion 550 of any of the plurality of associated light receiving elements 55.
- the emission surface of the fiber bundle 54 and the light receiving portion 550 of the light receiving element 55 may not be in contact with each other. ..
- FIG. 17 shows an example in which the entrance surface and the emission surface are parallel, but the entrance surface and the emission surface may be non-parallel as long as the optical signal can be guided from the entrance surface to the emission surface.
- the bundle of the plurality of optical fibers 540 is bundled so as to taper from the entrance surface to the emission surface of the fiber bundle 54 toward the light receiving portion 550 of the associated light receiving element 55.
- the plurality of optical fibers 540 may be arranged linearly or curvedly from the incident end to the emitted end.
- the optical fiber 540 constituting the fiber bundle 54 may have the same diameter at the incident end and the emitted end, or may have different diameters at the incident end and the emitted end.
- a fiber having a smaller diameter at the exit end than the incident end may be used as the optical fiber 540 constituting the fiber bundle 54.
- the optical fiber 540 is preferably made of a material that easily transmits light in the wavelength band of spatial light.
- the optical fiber 540 can be made of a general optical fiber material.
- the incident end of the optical fiber 540 may be antireflection coated so that light in the frequency band of the optical signal is not easily reflected.
- the optical signal incident from the incident surface of the fiber bundle 54 is guided to the exit surface while being totally reflected by the side surface of the optical fiber 540 constituting the fiber bundle 54.
- the optical signal guided to the emission surface is emitted toward the light receiving unit 550 of the light receiving element 55. Since the optical signal guided inside the optical fiber 540 constituting the fiber bundle 54 does not leak from the side surface of the optical fiber 540, most of the optical signal is emitted from the exit surface.
- the light receiving element 55 is arranged after the fiber bundle 54.
- the light receiving element 55 has a light receiving unit 550 that receives an optical signal emitted from the fiber bundle 54.
- the light receiving element 55 is arranged so that the light receiving portion 550 faces the emission surface of the fiber bundle 54.
- the optical signal emitted from the fiber bundle 54 is received by the light receiving unit 550 of the light receiving element 55.
- the light receiving element 55 converts the received optical signal into an electric signal.
- the light receiving element 55 outputs the converted electrical signal to a decoder (not shown).
- the light receiving element 55 has the same configuration as the light receiving element 15 of the first embodiment.
- the optical signal can be guided toward the light receiving unit 550 of the light receiving element 55. Therefore, the area of the light receiving portion 550 of the light receiving element 55 can be reduced. Therefore, a light receiving element 55 having the same light receiving efficiency but a small light receiving surface can be applied. For example, if the fiber bundle 54 is used, the light receiving element 55 having high sensitivity can be adopted although the area of the light receiving unit 550 is small.
- FIG. 20 is a conceptual diagram showing an example of the configuration of the light receiving device 50-2 of the modified example of the present embodiment.
- the light receiving device 50-2 includes a condenser lens 51, a light ray control element 53, a fiber bundle 54-2, and a light receiving element 55.
- FIG. 20 is a side view of the internal configuration of the light receiving device 50.
- the conceptual traveling direction (optical axis) of the optical signal emitted from the light ray control element 53 and traveling toward the emitting surface of the fiber bundle 54-2 is indicated by an arrow.
- the light receiving device 50-2 of this modification is different from the light receiving device 50 in the configuration of the plurality of optical fibers 545 included in the fiber bundle 54-2.
- the fiber bundle 54-2 includes a plurality of optical fibers 545.
- the fiber bundle 54-2 has a structure in which a plurality of optical fibers 545 are bundled together.
- a plurality of optical fibers 545 are arranged so that the optical axis of the optical signal emitted from the light ray control element 53 is incident from a substantially vertical direction with respect to the cross section of the incident end arranged on the incident surface of the fiber bundle 54-2. Will be done.
- the plurality of optical fibers 545 are arranged so as to draw a smooth curve from the incident end to the emitted end.
- the optical signal that has entered from the incident end of the plurality of optical fibers 545 travels inside the plurality of optical fibers 545 toward the emission end, and is emitted from the emission end of the plurality of optical fibers 545.
- the optical signal emitted from the emission end of the plurality of optical fibers 545 is received by the light receiving element 55.
- optical fiber 545 is arranged so that the incident direction of the optical signal emitted from the light ray control element 53 is substantially perpendicular to the cross section of the incident end of the optical fiber 545. Therefore, according to this modification, the reflection ratio of the optical signal at the incident end of the optical fiber 545 is reduced, and the optical signal is likely to be incident inside from the incident end of the optical fiber 545. Therefore, according to this modification, the light receiving efficiency by the light receiving element 55 is improved.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, a fiber bundle, and a light receiving element.
- the condenser lens receives a spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the fiber bundle includes a bundle of a plurality of optical fibers that guide an optical signal emitted from a light ray control element to a light receiving unit arranged in a predetermined region.
- each of the plurality of optical fibers is arranged so that the cross section of each incident end of the plurality of optical fibers included in the fiber bundle is substantially perpendicular to the optical axis of the optical signal emitted from the light control element. Will be done.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area. The light receiving element receives an optical signal.
- the optical signal condensed by the condensing lens is guided to the light receiving portion of the light receiving element via the fiber bundle, so that the optical signal derived from the spatial optical signal is more efficient. It can receive light well.
- the light receiving device of the present embodiment includes a decoder that decodes the optical signal received by the light receiving element.
- a decoder that decodes the optical signal received by the light receiving element.
- an example including an elongated light ray control element set according to the arrival direction of the spatial optical signal will be described, but a light ray control element capable of corresponding to the spatial optical signal arriving from an arbitrary direction is applied. You may.
- a reflection type light ray control element may be applied to the light receiving device of the present embodiment.
- the light receiving device of the present embodiment may be combined with the light pipe of the second embodiment or the fiber bundle of the fifth embodiment.
- FIG. 21 is a conceptual diagram showing an example of the configuration of the light receiving device 60 of the present embodiment.
- the light receiving device 60 includes a condenser lens 61, a light ray control element 63, a light receiving element 65, and a decoder 66.
- FIG. 21 is a side view of the internal configuration of the light receiving device 60.
- FIG. 22 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 60.
- FIG. 22 is a perspective view of the internal configuration of the light receiving device 60 as viewed diagonally from the front.
- the position of the decoder 66 is not particularly limited.
- the decoder 66 may be arranged inside the light receiving device 60, or may be arranged outside the light receiving device 60.
- the condenser lens 61 is an optical element that concentrates a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 61 is condensed toward the incident surface of the light ray control element 63.
- the condenser lens 61 has the same configuration as the condenser lens 11 of the first embodiment.
- the condensing lens 61 may be configured to condense an optical signal according to the shape of the light ray control element 63.
- the light ray control element 63 is arranged after the condenser lens 61.
- the light ray control element 63 is arranged so that its incident surface faces the emission surface of the condenser lens 61.
- the light ray control element 63 is set to have a shape that matches the arrival direction of the spatial optical signal, as in the third embodiment.
- the light ray control element 63 may be configured to correspond to a spatial optical signal arriving from an arbitrary direction as in the first embodiment. Further, the light ray control element 63 may be a reflection type as in the fourth embodiment. Since the light ray control element 63 is the same as any one of the first to fifth embodiments, detailed description thereof will be omitted.
- the light receiving element 65 is arranged after the light ray control element 63.
- the light receiving element 65 has a light receiving unit 650 that receives an optical signal emitted from the light ray controlling element 63.
- the light receiving element 65 is arranged so that the light receiving unit 650 faces the emission surface of the light ray control element 63.
- the optical signal emitted from the light ray control element 63 is received by the light receiving unit 650 of the light receiving element 65.
- the light receiving element 65 converts the received optical signal into an electric signal (hereinafter, also referred to as a signal).
- the light receiving element 65 outputs the converted signal to the decoder 66.
- the light receiving element 65 has the same configuration as the light receiving element 15 of the first embodiment.
- the decoder 66 acquires the signal output from the light receiving element 65.
- the decoder 66 amplifies the signal from the light receiving element 65.
- the decoder 66 decodes the amplified signal and analyzes the signal from the communication target.
- the signal decoded by the decoder 66 is used for any purpose. The use of the signal decoded by the decoder 66 is not particularly limited.
- FIG. 23 is a block diagram showing an example of the configuration of the decoder 66.
- the decoder 66 has an amplifier circuit 661 and a decode circuit 665.
- the amplifier circuit 661 acquires the signal from the light receiving element 65.
- the amplifier circuit 661 amplifies the selected signal.
- the amplifier circuit 661 may selectively pass a signal in the wavelength band of the spatial optical signal.
- the amplifier circuit 661 may cut a signal derived from ambient light such as sunlight from the acquired signals, and selectively pass a signal having a high frequency component corresponding to the wavelength band of the spatial optical signal.
- the amplifier circuit 661 outputs the amplified signal to the decode circuit 665.
- the decoding circuit 665 acquires a signal from the amplifier circuit 661.
- the decoding circuit 665 decodes the acquired signal.
- the decoding circuit 665 may be configured to add some signal processing to the decoded signal, or may be configured to output to an external signal processing device or the like (not shown).
- the second processing circuit may be configured to read those signals in a time division manner.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, a light receiving element, and a decoder.
- the condenser lens receives a spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the light control measure is a near-field diffractive optical element that diffracts an optical signal focused by a condenser lens toward a predetermined region.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area.
- the light receiving element receives an optical signal.
- the decoder decodes the signal based on the optical signal received by the light receiving element.
- the light receiving device of the present embodiment it is possible to decode a signal based on a spatial optical signal arriving from an arbitrary direction.
- a single channel receiving device can be realized.
- a multi-channel receiving device can be realized by decoding a signal based on a spatial optical signal in a time division manner.
- the light receiving device of the present embodiment includes a plurality of decoders that decode the optical signal received by the light receiving element.
- a light ray control element capable of corresponding to the spatial optical signal arriving from an arbitrary direction is applied. You may.
- a reflection type light ray control element may be applied to the light receiving device of the present embodiment.
- the light receiving device of the present embodiment may be combined with the light pipe of the second embodiment or the fiber bundle of the fifth embodiment.
- FIG. 24 is a conceptual diagram showing an example of the configuration of the light receiving device 70 of the present embodiment.
- the light receiving device 70 includes a condenser lens 71, a light ray control element 73, a plurality of light receiving elements 75-1 to M, and a decoder 76 (M is a natural number of 2 or more).
- FIG. 24 is a plan view of the internal configuration of the light receiving device 70 as viewed from above.
- FIG. 25 is a conceptual diagram for explaining an example of the locus of light received by the light receiving device 70.
- FIG. 25 is a perspective view of the internal configuration of the light receiving device 70 as viewed diagonally from the front.
- the position of the decoder 76 is not particularly limited.
- the decoder 76 may be arranged inside the light receiving device 70, or may be arranged outside the light receiving device 70.
- the condenser lens 71 is an optical element that concentrates a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 71 is condensed toward the incident surface of the light ray control element 73.
- the condenser lens 71 has the same configuration as the condenser lens 11 of the first embodiment.
- the condensing lens 71 may be configured to condense light according to the shape of the light ray control element 73.
- the light ray control element 73 is arranged after the condenser lens 71.
- the light ray control element 73 is arranged so that its incident surface faces the emission surface of the condenser lens 71.
- the light ray control element 73 is set in a shape that matches the arrival direction of the spatial optical signal, as in the third embodiment.
- the light ray control element 73 may be configured to correspond to a spatial optical signal arriving from an arbitrary direction as in the first embodiment. Further, the light ray control element 73 may be a reflection type as in the fourth embodiment.
- the optical signal condensed by the condenser lens 71 is incident on the incident surface of the light ray control element 73.
- a plurality of ray control regions 730-1 to M are set in the ray control element 73.
- Each of the plurality of ray control regions 730-1 to M set in the ray control element 73 is associated with each of the plurality of light receiving elements 75-1 to M.
- the optical signals incident on each of the plurality of light ray control areas 730-1 to M are emitted toward a predetermined area in which the light receiving portions 750 of the light receiving elements 75-1 to M corresponding to the respective light ray control areas 730 are arranged.
- the spatial optical signal A and the spatial optical signal B arriving from different directions are incident on the condenser lens 71.
- the optical signals derived from the spatial light signal A and the spatial optical signal B are condensed by the condenser lens 71 and incident on different ray control regions 730 of the ray control element 73.
- the light ray control element 13 emits an optical signal incident on different light ray control areas 730 toward a predetermined area associated with each light ray control area 730.
- the optical signals derived from the spatial optical signal A and the spatial optical signal B are received by different light receiving elements 75.
- the plurality of light receiving elements 75-1 to M are arranged after the light ray control element 73.
- Each of the plurality of light receiving elements 75-1 to M has a light receiving unit 750 that receives an optical signal emitted from the light ray control element 73.
- the plurality of light receiving elements 75-1 to M are arranged so that the emission surface of the light ray control element 73 and the light receiving unit 750 face each other.
- Each light receiving unit 750 of the plurality of light receiving elements 75-1 to M is arranged so as to face each of the plurality of light ray control regions 730-1 to M.
- the optical signals emitted from each of the plurality of light ray control regions 730-1 to M of the light ray control element 73 are received by the light receiving units 750 of each of the plurality of light receiving elements 75-1 to M.
- Each of the plurality of light receiving elements 75-1 to M converts the received optical signal into an electric signal (hereinafter, also referred to as a signal).
- Each of the plurality of light receiving elements 75-1 to M outputs the converted signal to the decoder 76.
- Each of the plurality of light receiving elements 75-1 to M has the same configuration as the light receiving element 15 of the first embodiment.
- the decoder 76 acquires the signals output from each of the plurality of light receiving elements 75-1 to M.
- the decoder 76 amplifies the signals from each of the plurality of light receiving elements 75-1 to M.
- the decoder 76 decodes the amplified signal and analyzes the signal from the communication target. For example, the decoder 76 collectively analyzes the signals for each of the plurality of light receiving elements 75-1 to M.
- the decoder 76 analyzes the signal individually for each of the plurality of light receiving elements 75-1 to M.
- the signal decoded by the decoder 76 is used for any purpose.
- the use of the signal decoded by the decoder 76 is not particularly limited.
- FIG. 26 is a block diagram showing an example of the configuration of the decoder 76.
- the decoder 76 has a plurality of first processing circuits 761-1 to M, a control circuit 762, a selector 763, and a plurality of second processing circuits 765-1 to N (N is a natural number).
- N is a natural number.
- the internal configuration of only the first processing circuit 761-1 among the plurality of first processing circuits 761-1 to M is shown, but the internal configuration of the plurality of first processing circuits 761-2 to M is shown. Is the same as that of the first processing circuit 761-1.
- the first processing circuit 761 is associated with any one of the plurality of light receiving elements 75-1 to M.
- the first processing circuit 761 includes a high-pass filter 7611, an amplifier 7613, and an integrator 7615.
- the high-pass filter 7611 is referred to as HPF (High Path Filter)
- the amplifier 7613 is referred to as AMP (Amplifier)
- the integrator 7615 is referred to as INT (Integrator).
- Each high-pass filter 7611 of the plurality of first processing circuits 761-1 to M receives a signal from any of the light receiving elements 75-1 to M associated with each of the plurality of first processing circuits 761-1 to M. get.
- Each of the plurality of light receiving elements 75-1 to M and each of the plurality of first processing circuits 761-1 to M corresponding thereto constitutes a unit unit.
- the signal that has passed through each of the high-pass filters 7611 of the plurality of first processing circuits 761-1 to M is input to the amplifier 7613 and the integrator 7615 in parallel.
- the high-pass filter 7611 acquires a signal from the light receiving element 75.
- the high-pass filter 7611 selectively passes a signal having a high frequency component corresponding to the wavelength band of the spatial optical signal among the acquired signals.
- the high-pass filter 7611 cuts signals derived from ambient light such as sunlight.
- a band-pass filter that selectively passes a signal in the wavelength band of the spatial optical signal may be configured.
- a color filter that selectively passes light in the wavelength band of the spatial optical signal may be installed in front of the light receiving surface of the light receiving element 75.
- the signal that has passed through the high-pass filter 7611 is supplied to the amplifier 7613 and the integrator 7615.
- the amplifier 7613 acquires the signal output from the high-pass filter 7611.
- the amplifier 7613 amplifies the acquired signal.
- the amplifier 7613 outputs the amplified signal to the selector 763.
- the signal to be received is assigned to any of the plurality of second processing circuits 765-1 to N according to the control of the control circuit 762.
- the signal to be received is a spatial optical signal from a communication device (not shown) to be communicated.
- the signal from the light receiving element 75 that is not used for receiving the spatial optical signal is not output to the second processing circuit 765.
- the integrator 7615 acquires the signal output from the high-pass filter 7611.
- the integrator 7615 integrates the acquired signal.
- the integrator 7615 outputs the integrated signal to the control circuit 762.
- the integrator 7615 is arranged to measure the intensity of the spatial optical signal received by the light receiving element 75.
- the speed of searching for a communication target is increased by receiving a spatial optical signal having a wide beam diameter on the incident surface of the condenser lens 71. Since the intensity of the spatial optical signal received when the beam diameter is not narrowed is weaker than that when the beam diameter is narrowed, it is difficult to measure the voltage of the signal amplified only by the amplifier 7613. ..
- the integrator 7615 for example, the voltage of the signal can be increased to a level at which the voltage can be measured by integrating from several msec (millisecond) to several tens of msec.
- the control circuit 762 acquires the signal output from the integrator 7615 included in each of the plurality of first processing circuits 761-1 to M. In other words, the control circuit 762 acquires a signal derived from an optical signal received by each of the plurality of light receiving elements 75-1 to M. For example, the control circuit 762 compares the readings of the signals from the plurality of light receiving elements 75 adjacent to each other, and selects the light receiving element 75 having the maximum signal intensity. The control circuit 762 controls the selector 763 so that the signal derived from the selected light receiving element 75 is assigned to any of the plurality of second processing circuits 765-1 to N.
- the selection of the light receiving element 75 by the control circuit 762 corresponds to estimating the arrival direction of the spatial optical signal. That is, selecting the light receiving element 75 by the control circuit 762 corresponds to specifying the communication device from which the spatial optical signal is transmitted. Further, assigning the signal from the light receiving element 75 selected by the control circuit 762 to any of the plurality of second processing circuits is a light receiving element that receives the specified communication target and the spatial optical signal from the communication target. Corresponds to associating with 75. That is, the control circuit 762 identifies the communication device from which the optical signal (spatial optical signal) is transmitted, based on the optical signals received by the plurality of light receiving elements 750-1 to M. When the position of the communication target is specified in advance, the signals output from the light receiving elements 75-1 to M may be decoded as they are without performing the process of estimating the arrival direction of the spatial optical signal.
- the signal amplified by the amplifier 7613 included in each of the plurality of first processing circuits 761-1 to M is input to the selector 763.
- the selector 763 outputs the signal to be received among the input signals to any one of the plurality of second processing circuits 765-1 to N according to the control of the control circuit 762.
- a signal that is not a reception target is not output from the selector 763.
- a signal from any of the plurality of light receiving elements 75-1 to N assigned by the control circuit 762 is input to the plurality of second processing circuits 765-1 to N.
- Each of the plurality of second processing circuits 765-1 to N decodes the input signal.
- Each of the plurality of second processing circuits 765-1 to N may be configured to add some signal processing to the decoded signal, or may be configured to output to an external signal processing device or the like (not shown). You may do it.
- one second processing circuit 765 is assigned to one communication target. That is, the control circuit 762 transfers the signal derived from the spatial optical signal from the plurality of communication targets received by the plurality of light receiving elements 75-1 to M to any of the plurality of second processing circuits 765-1 to N. assign.
- the light receiving device 70 can simultaneously read signals derived from spatial optical signals from a plurality of communication targets on individual channels.
- spatial optical signals from the plurality of communication targets are read in time division in one channel.
- the spatial optical signals from a plurality of communication targets are read simultaneously in a plurality of channels, so that the transmission speed is improved.
- the signal may be received in a time-division manner depending on the situation.
- the scan of the communication target may be performed as a primary scan, and the arrival direction of the spatial optical signal may be specified with coarse accuracy. Then, a secondary scan with fine accuracy may be performed in the specified direction to specify a more accurate position of the communication target.
- the exact position of the communication target can be determined by exchanging signals with the communication target. If the position of the communication target is specified in advance, the process of specifying the position of the communication target may be omitted.
- the light receiving device of the present embodiment includes a condenser lens, a light ray control element, a plurality of light receiving elements, and a plurality of decoders.
- the condenser lens receives a spatial optical signal.
- the ray control element includes a plurality of ray control regions associated with each of the plurality of predetermined regions.
- the ray control element emits an optical signal incident on each of the plurality of ray control regions toward a predetermined region associated with the ray control region.
- Each of the plurality of light receiving elements is arranged so that the light receiving portion faces any one of the plurality of predetermined areas.
- Each of the plurality of light receiving elements receives an optical signal.
- Each of the plurality of decoders is connected to any one of the plurality of light receiving elements. The decoder decodes the signal based on the optical signal received by the light receiving element.
- a signal based on a spatial optical signal arriving from an arbitrary direction can be decoded for each arriving direction.
- the communication device of the present embodiment includes the light receiving device of the sixth embodiment and a light transmitting unit that transmits a spatial optical signal corresponding to the received spatial optical signal.
- a communication device including a light transmission unit including a phase modulation type spatial light modulator will be described.
- the communication device of the present embodiment may include a light transmitting unit including a light transmitting function, which is not a phase modulation type spatial light modulator.
- the communication device of the present embodiment may be provided with a wireless communication function.
- the communication device of the present embodiment may be configured by combining the light receiving device of the seventh embodiment and the light transmitting unit.
- a reflection type light ray control element may be applied to the communication device of the present embodiment.
- the communication device of the present embodiment may be combined with the light pipe of the second embodiment or the fiber bundle of the fifth embodiment.
- FIG. 27 is a conceptual diagram showing an example of the configuration of the communication device 80 of the present embodiment.
- the communication device 80 includes a condenser lens 81, a light ray control element 83, a light receiving element 85, a decoder 86, and a light transmitting unit 87.
- FIG. 27 is a side view of the internal configuration of the communication device 80.
- the positions of the decoder 86 and the light transmitting unit 87 are not particularly limited.
- the decoder 86 and the light transmitting unit 87 may be arranged inside the communication device 80, or may be arranged outside the communication device 80.
- the condenser lens 81 is an optical element that concentrates a spatial optical signal arriving from the outside.
- the optical signal collected by the condenser lens 81 is condensed toward the incident surface of the light ray control element 83.
- the condenser lens 81 has the same configuration as the condenser lens 11 of the first embodiment.
- the condensing lens 81 may be configured to condense light according to the shape of the light ray control element 83.
- the light ray control element 83 is arranged after the condenser lens 81.
- the light ray control element 83 is arranged so that its incident surface faces the emission surface of the condenser lens 81.
- the light ray control element 83 is set to a shape that matches the arrival direction of the spatial light, as in the third embodiment.
- the light ray control element 83 may be configured to correspond to the spatial light arriving from an arbitrary direction as in the first embodiment.
- the light ray control element 83 may be a reflection type as in the fourth embodiment.
- the ray control element 83 may include a plurality of ray control regions as in the seventh embodiment. Since the light ray control element 83 is the same as any one of the first to seventh embodiments, detailed description thereof will be omitted.
- the light receiving element 85 is arranged after the light ray control element 83.
- the light receiving element 85 has a light receiving unit 850 that receives an optical signal emitted from the light ray controlling element 83.
- the light receiving element 85 is arranged so that the light receiving unit 850 faces the emission surface of the light ray control element 83.
- the optical signal emitted from the light ray control element 83 is received by the light receiving unit 850 of the light receiving element 85.
- the light receiving element 85 converts the received optical signal into an electric signal (hereinafter, also referred to as a signal).
- the light receiving element 85 outputs the converted signal to the decoder 86.
- the light receiving element 85 has the same configuration as the light receiving element 15 of the first embodiment.
- a plurality of light receiving elements 85 may be arranged as in the seventh embodiment.
- the decoder 86 acquires the signal output from the light receiving element 85.
- the decoder 86 amplifies the signal from the light receiving element 85.
- the decoder 86 decodes the amplified signal and analyzes the signal from the communication target.
- the decoder 86 outputs a control signal for transmitting an optical signal according to the analysis result of the signal to the light transmitting unit 87.
- the light transmitting unit 87 acquires a control signal from the decoder 86.
- the light transmitting unit 87 projects a spatial optical signal corresponding to the control signal.
- the spatial optical signal projected from the light transmitting unit 87 is received by a communication target (not shown).
- the light transmitting unit 87 includes a phase modulation type spatial light modulator.
- the light transmitting unit 87 may include a light transmitting function that is not a phase modulation type spatial light modulator.
- FIG. 28 is a conceptual diagram showing an example of the detailed configuration of the light transmitting unit 87.
- the light transmitting unit 87 includes an irradiation unit 871, a spatial light modulator 873, a control unit 875, and a projection optical system 877.
- the irradiation unit 871, the spatial light modulator 873, and the projection optical system 877 constitute the light projection unit 800.
- the light projecting unit 800 projects a spatial optical signal according to the control of the control unit 875. Note that FIG. 28 is conceptual and does not accurately represent the positional relationship between each component, the traveling direction of light, and the like.
- the irradiation unit 871 emits coherent light 802 having a specific wavelength.
- the irradiation unit 871 includes a light source 8711 and a collimating lens 8712.
- the light 801 emitted by the irradiation unit 871 passes through the collimating lens 8712 to become coherent light 802, and is incident on the modulation unit 8730 of the spatial light modulator 873.
- the light source 8711 includes a laser light source.
- the light source 8711 is configured to emit light 801 in the infrared region.
- the light source 8711 may be configured to emit light 801 other than the infrared region such as the visible region and the ultraviolet region.
- the irradiation unit 871 is connected to a power source (also referred to as a light source drive power source) that is driven according to the control of the control unit 875.
- a power source also referred to as a light source drive power source
- light 801 is emitted from the light source 8711.
- the spatial light modulator 873 sets a pattern (phase distribution corresponding to the spatial light signal) for projecting the spatial light signal in its own modulation unit 8730 according to the control of the control unit 875.
- the modulation unit 8730 is irradiated with light 802 in a state where a predetermined pattern is displayed on the modulation unit 8730 of the spatial light modulator 873.
- the spatial light modulator 873 emits the reflected light (modulated light 803) of the light 802 incident on the modulation unit 8730 toward the projection optical system 877.
- the incident angle of the light 802 is not perpendicular to the incident surface of the modulation unit 8730 of the spatial light modulator 873. That is, in the present embodiment, the emission axis of the light 802 from the irradiation unit 871 is slanted with respect to the modulation unit 8730 of the spatial light modulator 873, and the modulation unit 8730 of the spatial light modulator 873 is used without using the beam splitter. Light 802 is incident. In the configuration of FIG. 28, since the light 802 is not attenuated by passing through the beam splitter, the utilization efficiency of the light 802 can be improved.
- the spatial light modulator 873 can be realized by a phase modulation type spatial light modulator that receives the incident of coherent light 802 having the same phase and modulates the phase of the incident light 802. Since the light emitted from the projection optical system 877 using the phase modulation type spatial light modulator 873 is focus-free, it is necessary to change the focus for each projection distance even if the light is projected to a plurality of projection distances. There is no.
- the modulation section 8730 of the phase modulation type spatial light modulator 873 displays the phase distribution corresponding to the spatial light signal according to the drive of the control section 875.
- the modulated light 803 reflected by the modulator 8730 of the spatial light modulator 873 whose phase distribution is displayed becomes an image as if a kind of diffraction grating formed an aggregate, so that the light diffracted by the diffraction grating gathers. An image is formed on.
- the spatial light modulator 873 is realized by, for example, a spatial light modulator using a ferroelectric liquid crystal display, a homogenius liquid crystal display, a vertically oriented liquid crystal display, or the like.
- the spatial light modulator 873 can be realized by LCOS (Liquid Crystal on Silicon).
- the spatial light modulator 873 may be realized by a MEMS (Micro Electro Mechanical System).
- phase modulation type spatial light modulator 873 energy can be concentrated on the image portion by operating so as to sequentially switch the locations where the projected light is projected. Therefore, if the phase modulation type spatial light modulator 873 is used, the display information can be displayed brighter than those of other methods if the output of the light source is the same.
- the control unit 875 causes the modulation unit 8730 of the spatial light modulator 873 to display a pattern corresponding to the spatial optical signal according to the control signal from the decoder 86.
- the control unit 875 performs spatial light modulation so that the parameters that determine the difference between the phase of the light 801 irradiated to the modulation unit 8730 of the spatial light modulator 873 and the phase of the modulation light 803 reflected by the modulation unit 8730 change.
- the parameters that determine the difference between the phase of the light 802 irradiated to the modulator 8730 of the phase modulation type spatial light modulator 873 and the phase of the modulated light 803 reflected by the modulator 8730 are, for example, the refractive index and the optical path length. It is a parameter related to optical characteristics such as.
- the control unit 875 changes the refractive index of the modulation unit 8730 by changing the voltage applied to the modulation unit 8730 of the spatial light modulator 873. If the refractive index of the modulation section 8730 is changed, the light 802 irradiated to the modulation section 8730 is appropriately diffracted based on the refractive index of each section of the modulation section 8730.
- phase distribution of the light 802 irradiated to the phase modulation type spatial light modulator 873 is modulated according to the optical characteristics of the modulation unit 8730.
- the method of driving the spatial light modulator 873 by the control unit 875 is not limited to the above.
- the projection optical system 877 projects the modulated light 803 modulated by the spatial light modulator 873 as the projected light 807 (also referred to as a spatial optical signal).
- the projection optical system 877 includes a Fourier transform lens 8771, an aperture 8773, and a projection lens 8775.
- the modulated light 803 modulated by the spatial light modulator 873 is irradiated as projected light 807 by the projection optical system 877.
- any of the components of the projection optical system 877 may be omitted.
- the Fourier transform lens 8771 can be omitted.
- configurations other than the Fourier transform lens 8771, the aperture 8773, and the projection lens 8775 may be added to the projection optical system 877.
- the Fourier conversion lens 8771 is an optical lens for forming an image formed when the modulated light 803 reflected by the modulation unit 8730 of the spatial light modulator 873 is projected to infinity at a nearby focal point.
- the focal point is formed at the position of the aperture 8773.
- the aperture 8773 shields the higher-order light contained in the light focused by the Fourier transform lens 8771, and specifies the range in which the projected light 807 is displayed.
- the opening of the aperture 8773 is opened smaller than the outermost circumference of the display area at the position of the aperture 8773, and is installed so as to block the peripheral area of the display information at the position of the aperture 8773.
- the opening of the aperture 8773 is formed in a rectangular or circular shape.
- the aperture 8773 is preferably installed at the focal position of the Fourier transform lens 8771, but may be deviated from the focal position as long as it can exert a function of erasing higher-order light.
- the projection lens 8775 is an optical lens that magnifies and projects the light focused by the Fourier transform lens 8771.
- the projection lens 8775 projects the projected light 807 so that the display information corresponding to the phase distribution displayed on the modulation unit 8730 of the spatial light modulator 873 is projected within the projection range.
- the projected light 807 projected from the projection optical system 877 is not uniformly projected over the entire projection range, but the characters, symbols, frames, etc. that make up the image are displayed. It is projected intensively on the part. Therefore, according to the communication device 80 of the present embodiment, the amount of light emitted from the light 801 can be substantially reduced, so that the overall light output can be suppressed. That is, since the communication device 80 can be realized by the small and low power irradiation unit 871, the light source drive power supply (not shown) for driving the irradiation unit 871 can be reduced in output, and the overall power consumption can be reduced.
- the irradiation unit 871 is configured to emit light having a plurality of wavelengths, the wavelength of the light emitted from the irradiation unit 871 can be changed. By changing the wavelength of the light emitted from the irradiation unit 871, the color of the spatial optical signal can be multicolored. Further, if the irradiation unit 871 that simultaneously emits light of different wavelengths is used, communication using spatial optical signals of a plurality of colors becomes possible.
- FIG. 29 is a conceptual diagram for explaining an application example of the communication device 80 of the present embodiment.
- the communication device 80 is arranged on the upper part of the utility pole.
- the communication device 80 shall have a function of wireless communication.
- the upper part of the utility pole is suitable for installing the communication device 80. Further, if the communication device 80 is installed at the same height as the upper part of the electric pole, the arrival direction of the spatial optical signal is limited to the horizontal direction. Therefore, as in the third to seventh embodiments, the shape of the light ray control element. Can be made into a horizontally elongated structure.
- the two communication devices 80 for exchanging communication are arranged so that one communication device 80 receives a spatial optical signal transmitted from the other communication device 80. When there are only two communication devices 80, they may be arranged so as to send and receive spatial optical signals to and from each other.
- a communication network of spatial optical signals is configured by a plurality of communication devices 80, the communication device 80 located in the middle relays the spatial optical signals transmitted from the other communication devices 80 to another communication device 80. It may be arranged as follows.
- communication using spatial optical signals becomes possible between a plurality of communication devices 80 installed on different utility poles.
- communication by wireless communication is performed between a wireless device installed in a car or a house and the communication device 80 according to communication between communication devices 80 installed on different utility poles. You can also do it.
- the communication device of the present embodiment includes a condenser lens, a light ray control element, a light receiving element, a decoder, and a light transmitting unit.
- the condenser lens receives a spatial optical signal.
- the light ray control element emits an optical signal derived from a spatial optical signal condensed by a condenser lens toward a predetermined region.
- the light receiving element is arranged so that the light receiving portion faces a predetermined area.
- the light receiving element receives an optical signal.
- the decoder decodes the signal based on the optical signal received by the light receiving element.
- the light transmitting unit transmits a spatial optical signal corresponding to the signal decoded by the decoder.
- communication using a spatial optical signal becomes possible. For example, if a plurality of communication devices are arranged so that spatial optical signals can be transmitted and received, a communication network using spatial optical signals can be constructed.
- the light transmitting unit includes a light source, a spatial light modulator, a control unit, and a projection optical system.
- the light source emits parallel light.
- the spatial light modulator has a modulator that modulates the phase of parallel light emitted from a light source.
- the control unit sets a phase image corresponding to the spatial optical signal in the modulation unit, and controls the light source so that parallel light is emitted toward the modulation unit in which the phase image is set.
- the projection optical system projects the light modulated by the modulation unit.
- the communication device of this embodiment includes a phase modulation type spatial light modulator, it can transmit a spatial optical signal having the same brightness as a communication device including a general light transmission mechanism with low power consumption. ..
- the light receiving device of the present embodiment has a simplified configuration of the light receiving device of the first to eighth embodiments.
- FIG. 30 is a conceptual diagram showing an example of the configuration of the light receiving device 90 of the present embodiment.
- the light receiving device 90 includes a condenser lens 91, a light ray control element 93, and a light receiving element 95.
- the condenser lens 91 receives a spatial optical signal.
- the light ray control element 93 emits an optical signal derived from the spatial optical signal condensed by the condenser lens 91 toward a predetermined region.
- the light receiving element 95 is arranged so that the light receiving portion faces a predetermined area, and receives an optical signal.
- the light receiving device of the present embodiment by guiding the optical signal collected by the condensing lens to a predetermined region by the light ray control element, it is possible to efficiently receive the spatial optical signal arriving from an arbitrary direction.
- the information processing apparatus 100 of FIG. 31 is a configuration example for executing control and processing of each embodiment, and does not limit the scope of the present disclosure.
- the information processing device 100 includes a processor 101, a main storage device 102, an auxiliary storage device 103, an input / output interface 105, and a communication interface 106.
- the interface is abbreviated as I / F (Interface).
- the processor 101, the main storage device 102, the auxiliary storage device 103, the input / output interface 105, and the communication interface 106 are connected to each other via the bus 108 so as to be capable of data communication. Further, the processor 101, the main storage device 102, the auxiliary storage device 103, and the input / output interface 105 are connected to a network such as the Internet or an intranet via the communication interface 106.
- the processor 101 expands the program stored in the auxiliary storage device 103 or the like to the main storage device 102, and executes the expanded program.
- the software program installed in the information processing apparatus 100 may be used.
- the processor 101 executes control and processing according to each embodiment.
- the main storage device 102 has an area in which the program is expanded.
- the main storage device 102 may be a volatile memory such as a DRAM (Dynamic Random Access Memory). Further, a non-volatile memory such as MRAM (Magnetoresistive Random Access Memory) may be configured / added as the main storage device 102.
- DRAM Dynamic Random Access Memory
- MRAM Magnetic Random Access Memory
- the auxiliary storage device 103 stores various data.
- the auxiliary storage device 103 is composed of a local disk such as a hard disk or a flash memory. It is also possible to store various data in the main storage device 102 and omit the auxiliary storage device 103.
- the input / output interface 105 is an interface for connecting the information processing device 100 and peripheral devices.
- the communication interface 106 is an interface for connecting to an external system or device through a network such as the Internet or an intranet based on a standard or a specification.
- the input / output interface 105 and the communication interface 106 may be shared as an interface for connecting to an external device.
- the information processing device 100 may be configured to connect an input device such as a keyboard, a mouse, or a touch panel, if necessary. These input devices are used to input information and settings. When the touch panel is used as an input device, the display screen of the display device may also serve as the interface of the input device. Data communication between the processor 101 and the input device may be mediated by the input / output interface 105.
- the information processing apparatus 100 may be equipped with a display device for displaying information.
- a display device it is preferable that the information processing device 100 is provided with a display control device (not shown) for controlling the display of the display device.
- the display device may be connected to the information processing apparatus 100 via the input / output interface 105.
- the information processing device 100 may be equipped with a drive device.
- the drive device mediates between the processor 101 and the recording medium (program recording medium), such as reading data and programs from the recording medium and writing the processing result of the information processing device 100 to the recording medium.
- the drive device may be connected to the information processing device 100 via the input / output interface 105.
- the above is an example of the hardware configuration for executing the control and processing related to each embodiment.
- the hardware configuration of FIG. 31 is an example of a hardware configuration for executing control and processing according to each embodiment, and does not limit the scope of the present invention.
- a program for causing a computer to execute control and processing according to each embodiment is also included in the scope of the present invention.
- a program recording medium on which a program according to each embodiment is recorded is also included in the scope of the present invention.
- the recording medium can be realized by, for example, an optical recording medium such as a CD (Compact Disc) or a DVD (Digital Versatile Disc).
- the recording medium may be realized by a semiconductor recording medium such as a USB (Universal Serial Bus) memory or an SD (Secure Digital) card, a magnetic recording medium such as a flexible disk, or another recording medium.
- a semiconductor recording medium such as a USB (Universal Serial Bus) memory or an SD (Secure Digital) card
- a magnetic recording medium such as a flexible disk, or another recording medium.
- the components that execute the control and processing of each embodiment can be arbitrarily combined. Further, the components that execute the control and processing of each embodiment may be realized by software or may be realized by a circuit.
- Appendix 1 A condenser lens that collects spatial optical signals and A ray control element that emits an optical signal derived from the spatial optical signal condensed by the condenser lens toward a predetermined region, A light receiving device including a light receiving element that is arranged with a light receiving unit facing the predetermined area and receives the optical signal.
- Appendix 2 The ray control element is The light receiving device according to Appendix 1, which is a near-field diffractive optical element that diffracts the optical signal collected by the condenser lens toward the predetermined region.
- the ray control element is The light receiving device according to Appendix 1, which is a reflective diffractive optical element that diffracts and reflects the optical signal collected by the condenser lens toward the predetermined region.
- Appendix 4 The light receiving device according to any one of Supplementary note 1 to 3, further comprising a light pipe for guiding the optical signal emitted from the light ray control element to the light receiving unit arranged in the predetermined region.
- Appendix 5 The light pipe is Appendix 4 has a hollow structure and has a directional light guide body that has a hollow structure and directionally guides the optical signal toward the light receiving portion arranged in the predetermined region at least in the vicinity of the incident surface on the inner surface. The light receiving device described.
- the ray control element is The light receiving device according to any one of Supplementary note 1 to 7, which has a shape corresponding to the arrival direction of the spatial optical signal.
- Appendix 10 With the plurality of light receiving elements, With the plurality of said decoders, Each of the plurality of light receiving elements The light receiving portion is arranged so as to face any one of the plurality of predetermined areas.
- the ray control element is A plurality of ray control regions associated with each of the plurality of predetermined regions are included, and the optical signal incident on each of the plurality of ray control regions is transferred to the predetermined region associated with the ray control region.
- the light receiving device according to Appendix 9, which emits light toward the light beam. (Appendix 11) With the light receiving device of Appendix 9 or 10, A communication device including a light transmitting unit that transmits a spatial optical signal corresponding to a signal decoded by a decoder.
- the light transmitter A light source that emits parallel light and A spatial light modulator having a modulator that modulates the phase of parallel light emitted from the light source, and A control unit that sets a phase image corresponding to the spatial optical signal in the modulation unit and controls the light source so that the parallel light is irradiated toward the modulation unit in which the phase image is set.
- the communication device further comprising a projection optical system for projecting light modulated by the modulation unit.
- Light receiving device 11, 21, 31, 41, 51, 61, 71, 81, 91 Condensing lens 13, 23, 33, 43, 53, 63, 73, 83 , 93 Light control element 15, 25, 35, 45, 55, 65, 75, 85, 95 Light receiving element 24 Light pipe 54 Fiber bundle 66, 76, 86 Decoder 80 Communication device 87 Light transmitter 661 Amplification circuit 665 Decoding circuit 761 1st processing circuit 765 2nd processing circuit 762 Control circuit 763 Selector 800 Floodlight 871 Irradiation unit 873 Spatial light modulator 877 Projection optical system 7611 High pass filter 7613 Amplifier 7615 Integrator 8711 Light source 8712 Collimated lens 8771 Fourier conversion lens 8773 Aperture 8775 Projection lens
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Abstract
Description
まず、第1の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、光ファイバなどの媒体を用いずに、空間を伝播する光信号(以下、空間光信号とも呼ぶ)を送受信し合う光空間通信に用いられる。本実施形態の受光装置は、空間を伝搬する光を受光する用途であれば、光空間通信以外の用途に用いられてもよい。以下において、空間光信号は、十分に離れた位置から到来するために平行光とみなす。
図1は、本実施形態の受光装置10の構成の一例を示す概念図である。受光装置10は、集光レンズ11、光線制御素子13、および受光素子15を備える。図2および図3は、受光装置10によって受光される光の軌跡の一例について説明するための概念図である。図1および図2は、受光装置10の内部構成を横方向から見た図である。図3は、受光装置10の内部構成を、斜め前方から見た斜視図である。
次に、第2の実施形態の受光装置について図面を参照しながら説明する。本実施形態の受光装置は、光線制御素子から出射された光信号を、受光素子の受光部に導くライトパイプを備える。ライトパイプは、光線制御素子から出射された光信号を、受光素子の受光部に導光する部材である。
図5は、本実施形態の受光装置20の構成の一例を示す概念図である。受光装置20は、集光レンズ21、光線制御素子23、ライトパイプ24、および受光素子25を備える。図5は、受光装置20の内部構成を横方向から見た図である。図6は、受光装置20によって受光される光の軌跡の一例について説明するための概念図である。図6は、受光装置20の内部構成を、斜め前方から見た斜視図である。
次に、第3の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、空間光信号が到来する方向がある程度限定される状況で用いられる。本実施形態の受光装置は、空間光信号の到来方向に合わせて設定された、細長い形状の光線制御素子を含む。本実施形態では、空間光信号の到来方向が水平方向に限定されるものとし、その到来方向に合わせて、光線制御素子の形状を水平方向に細長い形状とする。本実施形態の受光装置は、第2の実施形態のライトパイプと組み合わせてもよい。
図12は、本実施形態の受光装置30の構成の一例を示す概念図である。受光装置30は、集光レンズ31、光線制御素子33、および受光素子35を備える。図12は、受光装置30の内部構成を横方向から見た図である。図13は、受光装置30によって受光される光の軌跡の一例について説明するための概念図である。図13は、受光装置30の内部構成を、斜め前方から見た斜視図である。
次に、第4の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、集光レンズによって集光された光信号を、回折して、所定領域に反射して導光する光線制御素子を含む。本実施形態においては、空間光信号の到来方向に合わせて設定された、細長い形状の光線制御素子を含む例について説明するが、任意の方向から到来する空間光信号に対応できる光線制御素子(第1の実施形態)を適用してもよい。また、本実施形態の受光装置は、第2の実施形態のライトパイプと組み合わせてもよい。
図14は、本実施形態の受光装置40の構成の一例を示す概念図である。受光装置40は、集光レンズ41、光線制御素子43、および受光素子45を備える。図14は、受光装置40の内部構成を横方向から見た図である。図15は、受光装置40によって受光される光の軌跡の一例について説明するための概念図である。図15は、受光装置40の内部構成を、斜め前方から見た斜視図である。
次に、第5の実施形態の受光装置について図面を参照しながら説明する。本実施形態の受光装置は、光線制御素子から出射された光信号を、受光素子の受光部に導くファイババンドルを備える。ファイババンドルは、光線制御素子から出射された光信号を、受光素子の受光部に導光する部材である。
図17は、本実施形態の受光装置50の構成の一例を示す概念図である。受光装置50は、集光レンズ51、光線制御素子53、ファイババンドル54、および受光素子55を備える。図17は、受光装置50の内部構成を横方向から見た図である。図18は、受光装置50によって受光される光の軌跡の一例について説明するための概念図である。図19は、受光装置50に含まれるファイババンドル54を、斜め前方から見た斜視図である。
図20は、本実施形態の変形例の受光装置50-2の構成の一例を示す概念図である。受光装置50-2は、集光レンズ51、光線制御素子53、ファイババンドル54-2、および受光素子55を備える。図20は、受光装置50の内部構成を横方向から見た図である。図20には、光線制御素子53から出射され、ファイババンドル54-2の出射面に向けて進行する光信号の概念的な進行方向(光軸)を矢印で示す。本変形例の受光装置50-2は、ファイババンドル54-2に含まれる複数の光ファイバ545の構成が、受光装置50とは異なる。
次に、第6の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、受光素子によって受光された光信号をデコードするデコーダを備える。本実施形態においては、空間光信号の到来方向に合わせて設定された、細長い形状の光線制御素子を含む例について説明するが、任意の方向から到来する空間光信号に対応できる光線制御素子を適用してもよい。また、本実施形態の受光装置には、第4の実施形態のように、反射型の光線制御素子を適用してもよい。また、本実施形態の受光装置は、第2の実施形態のライトパイプや、第5の実施形態のファイババンドルと組み合わせてもよい。
図21は、本実施形態の受光装置60の構成の一例を示す概念図である。受光装置60は、集光レンズ61、光線制御素子63、受光素子65、およびデコーダ66を備える。図21は、受光装置60の内部構成を横方向から見た図である。図22は、受光装置60によって受光される光の軌跡の一例について説明するための概念図である。図22は、受光装置60の内部構成を、斜め前方から見た斜視図である。なお、デコーダ66の位置については、特に限定を加えない。デコーダ66は、受光装置60の内部に配置されてもよいし、受光装置60の外部に配置されてもよい。
次に、受光装置60が備えるデコーダ66の詳細構成の一例について図面を参照しながら説明する。図23は、デコーダ66の構成の一例を示すブロック図である。デコーダ66は、増幅回路661およびデコード回路665を有する。
次に、第7の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、受光素子によって受光された光信号をデコードするデコーダを複数備える。本実施形態においては、空間光信号の到来方向に合わせて設定された、細長い形状の光線制御素子を含む例について説明するが、任意の方向から到来する空間光信号に対応できる光線制御素子を適用してもよい。また、本実施形態の受光装置には、第4の実施形態のように、反射型の光線制御素子を適用してもよい。また、本実施形態の受光装置は、第2の実施形態のライトパイプや、第5の実施形態のファイババンドルと組み合わせてもよい。
図24は、本実施形態の受光装置70の構成の一例を示す概念図である。受光装置70は、集光レンズ71、光線制御素子73、複数の受光素子75-1~M、およびデコーダ76を備える(Mは、2以上の自然数)。図24は、受光装置70の内部構成を上方向から見た平面図である。図25は、受光装置70によって受光される光の軌跡の一例について説明するための概念図である。図25は、受光装置70の内部構成を、斜め前方から見た斜視図である。なお、デコーダ76の位置については、特に限定を加えない。デコーダ76は、受光装置70の内部に配置されてもよいし、受光装置70の外部に配置されてもよい。
次に、受光装置70が備えるデコーダ76の詳細構成の一例について図面を参照しながら説明する。図26は、デコーダ76の構成の一例を示すブロック図である。デコーダ76は、複数の第1処理回路761-1~M、制御回路762、セレクタ763、および複数の第2処理回路765-1~Nを有する(Nは自然数)。図26においては、複数の第1処理回路761-1~Mのうち、第1処理回路761-1のみ内部構成を図示しているが、複数の第1処理回路761-2~Mの内部構成も第1処理回路761-1と同様である。
次に、第8の実施形態に係る通信装置について図面を参照しながら説明する。本実施形態の通信装置は、第6の実施形態の受光装置と、受光された空間光信号に応じた空間光信号を送光する送光部とを備える。以下においては、位相変調型の空間光変調器を含む送光部を備える通信装置の例について説明する。なお、本実施形態の通信装置は、位相変調型の空間光変調器ではない送光機能を含む送光部を備えてもよい。また、本実施形態の通信装置は、無線通信機能を備えてもよい。本実施形態の通信装置は、第7の実施形態の受光装置と、送光部とを組み合わせた構成としてもよい。本実施形態の通信装置には、第4の実施形態のように、反射型の光線制御素子を適用してもよい。本実施形態の通信装置は、第2の実施形態のライトパイプや、第5の実施形態のファイババンドルと組み合わせてもよい。
図27は、本実施形態の通信装置80の構成の一例を示す概念図である。通信装置80は、集光レンズ81、光線制御素子83、受光素子85、デコーダ86、および送光部87を備える。図27は、通信装置80の内部構成を横方向から見た図である。なお、デコーダ86および送光部87の位置については、特に限定を加えない。デコーダ86および送光部87は、通信装置80の内部に配置されてもよいし、通信装置80の外部に配置されてもよい。
次に、送光部87の詳細構成の一例について図面を参照しながら説明する。図28は、送光部87の詳細構成の一例を示す概念図である。送光部87は、照射部871、空間光変調器873、制御部875、および投射光学系877を備える。照射部871、空間光変調器873、および投射光学系877は、投光部800を構成する。投光部800は、制御部875の制御に応じて、空間光信号を投射する。なお、図28は概念的なものであり、各構成要素間の位置関係や、光の進行方向などを正確に表したものではない。
図29は、本実施形態の通信装置80の適用例について説明するための概念図である。本適用例では、通信装置80を電柱の上部に配置する。なお、本適用例において、通信装置80は、無線通信する機能を有するものとする。
次に、第9の実施形態に係る受光装置について図面を参照しながら説明する。本実施形態の受光装置は、第1~第8の実施形態の受光装置を簡略化した構成である。図30は、本実施形態の受光装置90の構成の一例を示す概念図である。受光装置90は、集光レンズ91、光線制御素子93、および受光素子95を備える。
ここで、本開示の各実施形態に係る制御や処理を実行するハードウェア構成について、図31の情報処理装置100を一例として挙げて説明する。なお、図31の情報処理装置100は、各実施形態の制御や処理を実行するための構成例であって、本開示の範囲を限定するものではない。
(付記1)
空間光信号を集光する集光レンズと、
前記集光レンズによって集光された前記空間光信号に由来する光信号を、所定領域に向けて出射する光線制御素子と、
前記所定領域に受光部を向けて配置され、前記光信号を受光する受光素子と、を備える受光装置。
(付記2)
前記光線制御素子は、
前記集光レンズによって集光された前記光信号を、前記所定領域に向けて回折するニアフィールド回折光学素子である付記1に記載の受光装置。
(付記3)
前記光線制御素子は、
前記集光レンズによって集光された前記光信号を、前記所定領域に向けて回折して反射する反射型の回折光学素子である付記1に記載の受光装置。
(付記4)
前記光線制御素子から出射された前記光信号を、前記所定領域に配置された前記受光部に導光するライトパイプを備える付記1乃至3のいずれか一項に記載の受光装置。
(付記5)
前記ライトパイプは、
中空構造であり、内側の面上のうち少なくとも入射面近傍に、前記所定領域に配置された前記受光部に向けて前記光信号を指向的に導光する指向性導光体を有する付記4に記載の受光装置。
(付記6)
前記光線制御素子から出射された前記光信号を、前記所定領域に配置された前記受光部に導光する複数の光ファイバの束を含むファイババンドルを備える付記1乃至3のいずれか一項に記載の受光装置。
(付記7)
前記ファイババンドルに含まれる複数の前記光ファイバの各々の入射端の断面が、前記光線制御素子から出射された前記光信号の光軸に対して略垂直になるように、複数の前記光ファイバの各々が配置される付記6に記載の受光装置。
(付記8)
前記光線制御素子は、
前記空間光信号の到来方向に合わせた形状を有する付記1乃至7のいずれか一項に記載の受光装置。
(付記9)
前記受光素子によって受光された前記光信号に基づく信号をデコードするデコーダを備える付記1乃至8のいずれか一項に記載の受光装置。
(付記10)
複数の前記受光素子と、
複数の前記デコーダと、を備え、
複数の前記受光素子の各々は、
複数の前記所定領域のうちいずれかに前記受光部を向けて配置され、
複数の前記デコーダの各々は、
複数の前記受光素子のうちいずれかに接続され、
前記光線制御素子は、
複数の前記所定領域の各々に対応付けられた複数の光線制御領域を含み、複数の前記光線制御領域の各々に入射された前記光信号を、前記光線制御領域に対応付けられた前記所定領域に向けて出射する付記9に記載の受光装置。
(付記11)
付記9または10の受光装置と、
デコーダによってデコードされた信号に応じた空間光信号を送光する送光部と、を備える通信装置。
(付記12)
前記送光部は、
平行光を出射する光源と、
前記光源から出射された平行光の位相を変調する変調部を有する空間光変調器と、
前記空間光信号に対応する位相画像を前記変調部に設定し、前記位相画像が設定された前記変調部に向けて前記平行光が照射されるように前記光源を制御する制御部と、
前記変調部で変調された光を投射する投射光学系と、を有する付記11に記載の通信装置。
11、21、31、41、51、61、71、81、91 集光レンズ
13、23、33、43、53、63、73、83、93 光線制御素子
15、25、35、45、55、65、75、85、95 受光素子
24 ライトパイプ
54 ファイババンドル
66、76、86 デコーダ
80 通信装置
87 送光部
661 増幅回路
665 デコード回路
761 第1処理回路
765 第2処理回路
762 制御回路
763 セレクタ
800 投光部
871 照射部
873 空間光変調器
877 投射光学系
7611 ハイパスフィルタ
7613 増幅器
7615 積分器
8711 光源
8712 コリメートレンズ
8771 フーリエ変換レンズ
8773 アパーチャ
8775 投射レンズ
Claims (12)
- 空間光信号を集光する集光レンズと、
前記集光レンズによって集光された前記空間光信号に由来する光信号を、所定領域に向けて出射する光線制御素子と、
前記所定領域に受光部を向けて配置され、前記光信号を受光する受光素子と、を備える受光装置。 - 前記光線制御素子は、
前記集光レンズによって集光された前記光信号を、前記所定領域に向けて回折するニアフィールド回折光学素子である請求項1に記載の受光装置。 - 前記光線制御素子は、
前記集光レンズによって集光された前記光信号を、前記所定領域に向けて回折して反射する反射型の回折光学素子である請求項1に記載の受光装置。 - 前記光線制御素子から出射された前記光信号を、前記所定領域に配置された前記受光部に導光するライトパイプを備える請求項1乃至3のいずれか一項に記載の受光装置。
- 前記ライトパイプは、
中空構造であり、内側の面上のうち少なくとも入射面近傍に、前記所定領域に配置された前記受光部に向けて前記光信号を指向的に導光する指向性導光体を有する請求項4に記載の受光装置。 - 前記光線制御素子から出射された前記光信号を、前記所定領域に配置された前記受光部に導光する複数の光ファイバの束を含むファイババンドルを備える請求項1乃至3のいずれか一項に記載の受光装置。
- 前記ファイババンドルに含まれる複数の前記光ファイバの各々の入射端の断面が、前記光線制御素子から出射された前記光信号の光軸に対して略垂直になるように、複数の前記光ファイバの各々が配置される請求項6に記載の受光装置。
- 前記光線制御素子は、
前記空間光信号の到来方向に合わせた形状を有する請求項1乃至7のいずれか一項に記載の受光装置。 - 前記受光素子によって受光された前記光信号に基づく信号をデコードするデコーダを備える請求項1乃至8のいずれか一項に記載の受光装置。
- 複数の前記受光素子と、
複数の前記デコーダと、を備え、
複数の前記受光素子の各々は、
複数の前記所定領域のうちいずれかに前記受光部を向けて配置され、
複数の前記デコーダの各々は、
複数の前記受光素子のうちいずれかに接続され、
前記光線制御素子は、
複数の前記所定領域の各々に対応付けられた複数の光線制御領域を含み、複数の前記光線制御領域の各々に入射された前記光信号を、前記光線制御領域に対応付けられた前記所定領域に向けて出射する請求項9に記載の受光装置。 - 請求項9または10の受光装置と、
デコーダによってデコードされた信号に応じた空間光信号を送光する送光部と、を備える通信装置。 - 前記送光部は、
平行光を出射する光源と、
前記光源から出射された平行光の位相を変調する変調部を有する空間光変調器と、
前記空間光信号に対応する位相画像を前記変調部に設定し、前記位相画像が設定された前記変調部に向けて前記平行光が照射されるように前記光源を制御する制御部と、
前記変調部で変調された光を投射する投射光学系と、を有する請求項11に記載の通信装置。
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PCT/JP2021/039348 WO2022149333A1 (ja) | 2021-01-05 | 2021-10-25 | 受光装置および通信装置 |
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US (1) | US20240105867A1 (ja) |
JP (1) | JPWO2022149333A1 (ja) |
WO (1) | WO2022149333A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61128639A (ja) * | 1984-11-27 | 1986-06-16 | Nippon Soken Inc | 受光器 |
JPH0851400A (ja) * | 1994-08-05 | 1996-02-20 | Nippon Columbia Co Ltd | 光受信機 |
JPH1051378A (ja) * | 1996-07-26 | 1998-02-20 | Matsushita Electric Ind Co Ltd | 通信符号化方法 |
JP2004096155A (ja) * | 2002-08-29 | 2004-03-25 | Canon Inc | 光空間通信装置 |
JP2005274305A (ja) * | 2004-03-24 | 2005-10-06 | Victor Co Of Japan Ltd | 光検出装置 |
JP2006003636A (ja) * | 2004-06-17 | 2006-01-05 | Canon Inc | 照明光学系およびそれを用いた投写型表示装置 |
JP2015184581A (ja) * | 2014-03-25 | 2015-10-22 | 大日本印刷株式会社 | 照明装置、投射装置および照射装置 |
-
2021
- 2021-10-25 WO PCT/JP2021/039348 patent/WO2022149333A1/ja active Application Filing
- 2021-10-25 US US18/270,267 patent/US20240105867A1/en active Pending
- 2021-10-25 JP JP2022573923A patent/JPWO2022149333A1/ja active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61128639A (ja) * | 1984-11-27 | 1986-06-16 | Nippon Soken Inc | 受光器 |
JPH0851400A (ja) * | 1994-08-05 | 1996-02-20 | Nippon Columbia Co Ltd | 光受信機 |
JPH1051378A (ja) * | 1996-07-26 | 1998-02-20 | Matsushita Electric Ind Co Ltd | 通信符号化方法 |
JP2004096155A (ja) * | 2002-08-29 | 2004-03-25 | Canon Inc | 光空間通信装置 |
JP2005274305A (ja) * | 2004-03-24 | 2005-10-06 | Victor Co Of Japan Ltd | 光検出装置 |
JP2006003636A (ja) * | 2004-06-17 | 2006-01-05 | Canon Inc | 照明光学系およびそれを用いた投写型表示装置 |
JP2015184581A (ja) * | 2014-03-25 | 2015-10-22 | 大日本印刷株式会社 | 照明装置、投射装置および照射装置 |
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JPWO2022149333A1 (ja) | 2022-07-14 |
US20240105867A1 (en) | 2024-03-28 |
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