WO2020022149A1 - Electromagnetic wave detection device and information acquisition system - Google Patents

Abstract

This electromagnetic wave detection device comprises an image formation part for forming incident electromagnetic waves into an image, a prism including a reflection surface for reflecting incident electromagnetic waves from the image formation part and a first emission surface for emitting the electromagnetic waves reflected by the reflection surface, and a first detection unit for detecting the electromagnetic waves emitted from the first emission surface.

Description

Electromagnetic wave detection device and information acquisition system Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2018-141782 filed on Jul. 27, 2018, the entire disclosure of which is incorporated herein by reference.

The present invention relates to an electromagnetic wave detection device and an information acquisition system.

(2) An optical system for an endoscope including a prism for guiding a light beam from an objective lens system to an image sensor is known (see Patent Document 1).

JP-A-6-59195

In order to solve the above-described problems, the electromagnetic wave detection device according to the first aspect includes:
An imaging unit for imaging an incident electromagnetic wave;
A prism including a reflection surface that reflects the electromagnetic wave incident from the imaging unit, and a first emission surface that emits the electromagnetic wave reflected by the reflection surface;
A first detection unit that detects an electromagnetic wave emitted from the first emission surface;
With
The traveling direction of the first electromagnetic wave included in the bundle of the first electromagnetic waves incident on and passing through the imaging unit, and the second direction included in the bundle of the second electromagnetic waves incident on and passing through the imaging unit. The angle between the electromagnetic wave and the traveling direction is within a predetermined value,
The electromagnetic wave detectable region by the first detection unit is arranged only on the traveling path of the electromagnetic wave incident from a predetermined angle of view range.

Further, the information acquisition system according to the second aspect includes:
Said electromagnetic wave detection device,
A control unit that obtains information about the surroundings based on a detection result of the electromagnetic wave by the first detection unit;
Is provided.

As described above, the solution of the present disclosure has been described as an apparatus and a system. However, the present disclosure can also be realized as an embodiment including these, and a method, a program, It should be understood that the present invention can also be realized as a storage medium on which a program is recorded, and these are also included in the scope of the present disclosure.

FIG. 1 is a configuration diagram illustrating a schematic configuration of an information acquisition system including an electromagnetic wave detection device according to a first embodiment. FIG. 2 is a configuration diagram illustrating a schematic configuration of the electromagnetic wave detection device of FIG. 1. 3 is a timing chart illustrating the timing of electromagnetic wave radiation and the timing of detection for explaining the principle of distance measurement by a distance measurement sensor configured by the radiation unit, the second detection unit, and the control unit in FIG. 1. It is a lineblock diagram showing the schematic structure of the electromagnetic wave detection device concerning a 2nd embodiment. It is a lineblock diagram showing a schematic structure of an electromagnetic wave detection device concerning a 3rd embodiment. It is a lineblock diagram showing the schematic structure of the electromagnetic wave detection device concerning a 4th embodiment. It is a lineblock diagram showing the schematic structure of the electromagnetic wave detection device concerning a 5th embodiment. It is a lineblock diagram showing the schematic structure of the modification of the electromagnetic wave detection device concerning a 5th embodiment. It is a block diagram which shows the schematic structure of the conventional electromagnetic wave detection apparatus. FIG. 9 is a configuration diagram illustrating a schematic configuration in which a conventional electromagnetic wave detection device includes a light shielding plate.

(4) In an optical system device, detection of an electromagnetic wave with high accuracy is useful.

Accordingly, an object of the present disclosure made in view of the problems of the related art described above is to detect electromagnetic waves with high accuracy.

Hereinafter, an embodiment of an electromagnetic wave detection device to which the present invention is applied will be described with reference to the drawings. An electromagnetic wave detection device having a primary imaging optical system that forms an image of an incident electromagnetic wave and a reflecting surface that reflects the electromagnetic wave transmitted through the primary imaging optical system can detect the reflected electromagnetic wave. In such an electromagnetic wave detection device, a reflection surface is arranged on the image side of the primary imaging optical system, and a surface for causing the electromagnetic wave traveling by reflection to travel to the detection unit is provided. It can be arranged without interference. Thereby, good imaging characteristics such as imaging performance, brightness, and angle of view of the primary imaging optical system can be secured.

As shown in FIG. 9, such an electromagnetic wave detection device is configured such that, out of the electromagnetic waves emitted from the imaging unit 159, the electromagnetic waves incident on the imaging unit 159 from outside the predetermined angle of view range α are reflected by a desired reflection surface. May not be reflected. Specifically, when the electromagnetic wave EW1 that has entered the imaging unit 159 from an object point in a predetermined angle of view range α is emitted from the imaging unit 159, the first surface s19 and the second surface s19 in the prism 169 After being reflected at s29, the light passes through the third surface s39 and reaches the detection unit 179. The electromagnetic wave EW2 that has entered the image forming unit 159 from some object points outside the range of the predetermined angle of view range α is reflected by the first surface s19, and then reflected by the third surface s29 without being reflected by the second surface s29. And reaches the detection unit 179 through the surface s39. For this reason, the electromagnetic wave radiated from the object point within the predetermined angle of view range α and the electromagnetic wave EW2 radiated from some object points outside the predetermined angle of view range α May be reached.

電磁 Also, the electromagnetic wave EW3 that has entered the imaging unit 159 from some other object point outside the predetermined angle-of-view range α may be reflected by a reflection surface other than the desired reflection surface. Also in this case, the electromagnetic wave radiated from the object point within the predetermined angle of view range α and incident on the imaging unit 159 and the electromagnetic wave radiated from some other object points outside the predetermined angle of view range α EW3 may reach the same position in the detection unit 17.

As a result, the detection unit 17 converts the electromagnetic wave EW1 radiated from the object point within the predetermined angle of view range α into the electromagnetic wave EW2, EW3 radiated from the object point outside the predetermined angle of view range α. To detect. Therefore, ghosts and flares are generated in the information based on the detected electromagnetic waves, and it is difficult to detect the electromagnetic waves with high accuracy.

Further, in order to prevent the electromagnetic wave incident on the imaging unit 15 from reaching the detection surface of the first detection unit 17 from an object point outside the predetermined angle of view range α, as shown in FIG. A configuration is conceivable in which a light shielding plate 90 composed of an absorber, a lens hood, and the like is provided on the first surface s19. However, since a part of the electromagnetic wave radiated from the object point within the predetermined angle of view range α is also blocked by the light shielding plate 90, the intensity of the electromagnetic wave radiated from the object point and reaching the detection unit 17 is reduced by the light shielding plate 90. It is lower than when not arranged.

As illustrated in FIG. 1, an information acquisition system 11 including an electromagnetic wave detection device 10 according to the first embodiment of the present disclosure includes an electromagnetic wave detection device 10, a radiation unit 12, a scanning unit 13, and a control unit 14. Have been.

In FIG. 1, the broken lines connecting the functional blocks indicate the flow of control signals or information to be communicated. The communication indicated by the broken line may be wire communication or wireless communication. A solid line protruding from each functional block indicates a beam-like electromagnetic wave.

電磁 As shown in FIG. 2, the electromagnetic wave detection device 10 has an imaging unit 15, a prism 16, and a first detection unit 17. In the following drawings, a solid line crossing each member or within each member travels along a traveling axis which is a central axis of a bundle of electromagnetic waves incident on the imaging unit 15 from an object point within a predetermined angle of view range α. 3 shows a traveling path of an electromagnetic wave. A broken line traversing each member or within each member indicates a traveling path of an electromagnetic wave traveling along a traveling axis among electromagnetic waves incident on the imaging unit 15 from an object point outside the predetermined angle of view range α. Show. The bundle of electromagnetic waves indicates electromagnetic waves that are spreading radially. When the electromagnetic wave on the traveling axis travels in the traveling direction, the electromagnetic wave on the traveling axis travels along the traveling path. Hereinafter, the first electromagnetic wave and the second electromagnetic wave may be simply referred to as “electromagnetic waves”.

The imaging unit 15 includes, for example, at least one of a lens and a mirror. The imaging unit 15 forms an image of an electromagnetic wave incident from a target ob which is a subject. The imaging unit 15 may be a retrofocus type lens system.

Further, the imaging unit 15 includes a traveling direction of the first electromagnetic wave included in the bundle of the first electromagnetic waves incident on and passing through the imaging unit 15, and a second electromagnetic wave incident on the imaging unit 15 and passing through the bundle. Are designed and manufactured so that the angle between the second electromagnetic wave included in the bundle and the traveling direction of the second electromagnetic wave is within a predetermined value. For example, the imaging unit 15 may be arranged so that the traveling axis of the electromagnetic wave incident from each angle of view passes through the center of the imaging unit in the preceding stage and then passes through the imaging unit in the subsequent stage. The first electromagnetic wave and the second electromagnetic wave are electromagnetic waves radiated from arbitrary object points different from each other.

角度 The angle between the traveling direction of the first electromagnetic wave and the traveling direction of the second electromagnetic wave may be, for example, within 15 °. The angle between the traveling direction of the first electromagnetic wave and the traveling direction of the second electromagnetic wave may be, for example, 0 °.

Alternatively or additionally, the imaging unit 15 may be configured such that an angle between the traveling direction of the electromagnetic wave included in the bundle of electromagnetic waves incident on and passing through the imaging unit 15 and the main axis of the imaging unit 15 is within a predetermined value. Designed and manufactured to be. For example, the traveling direction of the electromagnetic wave included in the bundle of electromagnetic waves that has entered and passed the imaging unit 15 may be substantially parallel to the main axis of the imaging unit 15. The optical system constituted by the imaging unit 15 may be image-side telecentric. For this purpose, an opening may be arranged in the vicinity of the position of the front focal point by the imaging unit 15.

The prism 16 is provided on the image side of the image forming unit 15. The prism 16 reflects the electromagnetic wave traveling from the image forming unit 15 and emits the reflected electromagnetic wave toward the first detecting unit 17. The detailed structure of the prism 16 will be described below.

The prism 16 has at least a reflection surface including a first reflection surface and a second reflection surface, and a first emission surface. In the first embodiment, the prism 16 includes a first surface s1, which is a first reflection surface, a second surface s2, which is a second reflection surface, and a third surface s3, which is a first exit surface. At least.

The prism 16 may have the first surface s1, the second surface s2, and the third surface s3 as different different surfaces. The prism 16 includes, for example, a triangular prism, and the first surface s1, the second surface s2, and the third surface s3 may intersect each other.

The prism 16 may be arranged such that the traveling axis of the electromagnetic wave incident on the second surface s2 from the first direction d1 is perpendicular to the second surface s2. Further, the prism 16 is disposed such that the first surface s1 is located in the second direction d2 in which the electromagnetic wave travels through the prism 16 by transmitting or refracting the second surface s2 from the first direction d1. May be. In addition, the prism 16 may be arranged such that the second surface s2 is located in the third direction d3 in which the electromagnetic wave reflected on the first surface s1 travels. For example, the first direction d1 is parallel to the main axis of the imaging unit 15 and includes a direction from the object plane to the imaging unit 15 and a direction from the imaging unit 15 to the image plane.

The first surface s1 causes the electromagnetic wave traveling in the second direction d2 from the second surface s2 to travel in the third direction d3. For example, the first surface s1 may internally reflect an electromagnetic wave traveling in the second direction d2 from the second surface s2 and cause the electromagnetic wave to travel in the third direction d3. Furthermore, the first surface s1 may cause the electromagnetic wave traveling from the second surface s2 in the second direction d2 to be totally internally reflected and travel in the third direction d3. The incident angle of the electromagnetic wave traveling from the first surface s1 in the third direction d3 to the second surface s2 may be equal to or greater than the critical angle.

The second surface s2 allows the electromagnetic wave incident on the prism 16 from the first direction d1 to travel in the second direction d2. The second surface s2 may be perpendicular to the traveling axis of the electromagnetic wave incident on the second surface s2 from the first direction d1. As described above, since the first direction d1 is parallel to the main axis of the imaging unit 15, the main axis of the imaging unit 15 is perpendicular to the second surface s2, in other words, the main surface of the imaging unit 15 and the second surface s2. The plane s2 may be parallel. The second surface s2 may transmit or refract an electromagnetic wave incident from the first direction d1 to travel in the second direction d2.

The second surface s2 causes the electromagnetic wave traveling from the first surface s1 in the third direction d3 to travel in the fourth direction d4. For example, the second surface s2 may internally reflect an electromagnetic wave that has traveled in the third direction d3 from the first surface s1 and travel in the fourth direction d4. Furthermore, the second surface s2 may cause the electromagnetic wave traveling from the first surface s1 in the third direction d3 to undergo total internal reflection and travel in the fourth direction d4. The incident angle of the electromagnetic wave traveling from the first surface s1 in the third direction d3 to the second surface s2 may be equal to or greater than the critical angle.

電磁 The third surface s3 emits, from the prism 16, an electromagnetic wave traveling from the second surface s2 in the fourth direction d4. The third surface s3 may be perpendicular to the traveling axis of the electromagnetic wave traveling in the fourth direction d4 from the second surface s2, that is, perpendicular to the fourth direction d4.

The first detector 17 detects the electromagnetic wave emitted from the third surface s3. In order to detect the electromagnetic wave emitted from the third surface s3, the first detection unit 17 is provided on the path of the electromagnetic wave traveling from the prism 16 in the fourth direction d4. In addition, in order to detect an electromagnetic wave that is incident on the imaging unit 15 from an object point in a predetermined angle of view range α and is emitted from the third surface s3, the first detection unit 17 uses the predetermined angle of view α Are provided on the path of the electromagnetic wave that enters the image forming unit 15 from the object point and travels from the prism 16 in the fourth direction d4.

Furthermore, the first detection unit 17 may be provided at or near the imaging position of the object ob by the imaging unit 15 in the fourth direction d4 from the prism 16. Therefore, the image of the electromagnetic wave of the target ob which reaches the detection surface of the first detection unit 17 via the first surface s1, the second surface s2, and the third surface s3 may be formed.

The first detector 17 may be arranged so that the detection surface is parallel to the third surface s3. As described above, the third surface s3 can be perpendicular to the traveling axis of the electromagnetic wave that travels and exits in the fourth direction d4, and the detection surface of the first detection unit 17 is separated from the third surface s3. It may be perpendicular to the traveling axis of the emitted electromagnetic wave.

に お い て In the first embodiment, the first detection unit 17 includes a passive sensor. In the first embodiment, the first detection unit 17 more specifically includes an element array. For example, the first detection unit 17 may include an image sensor such as an image sensor or an imaging array, capture an image of an electromagnetic wave formed on the detection surface, and generate image information corresponding to the captured object ob. .

In the first embodiment, the first detection unit 17 may more specifically capture a visible light image. The first detection unit 17 may transmit the generated image information to the control unit 14 as a signal.

The first detector 17 may detect electromagnetic waves in bands other than visible light. For example, the first detection unit 17 may include an infrared sensor that detects electromagnetic waves in an infrared band. For example, the first detection unit 17 may include a sensor that detects at least one of ultraviolet light and radio waves.

Moreover, the first detection unit 17 may include a distance measurement sensor. In this configuration, the electromagnetic wave detection device 10 can acquire image-like distance information using the first detection unit 17. Further, the first detection unit 17 may include a thermosensor or the like. In this configuration, the electromagnetic wave detection device 10 can acquire image-like temperature information by the first detection unit 17.

In a configuration in which the first detection unit 17 captures an image other than infrared light, an IR (infrared) cut coat is applied to at least one of the first surface s1, the second surface s2, and the third surface s3. It may be. Further, in a configuration in which the first detection unit 17 captures an image of an arbitrary electromagnetic wave, an AR (Anti-Reflection) coat may be applied to the third surface s3.

In the first embodiment, the first detection unit 17 may be an active sensor that detects a reflected wave of the electromagnetic wave emitted from the radiation unit 12 toward the target ob from the target ob. Note that, in the first embodiment, the first detection unit 17 is a reflected wave of the electromagnetic wave radiated toward the target ob by being radiated from the radiation unit 12 and reflected by the scanning unit 13. May be detected. As described later, the electromagnetic wave radiated from the radiating unit 12 may be at least one of infrared light, visible light, ultraviolet light, and radio wave.

に お い て In the first embodiment, the first detection unit 17 more specifically includes an element constituting a distance measurement sensor. For example, the first detection unit 17 includes a single element such as an APD (Avalanche PhotoDiode), a PD (PhotoDiode), a SPAD (Single Photon Avalanche Diode), a millimeter wave sensor, a submillimeter wave sensor, and a ranging image sensor. . Further, the first detection unit 17 may include an element array such as an APD array, a PD array, an MPPC (Multi Photo Pixel Pixel), a ranging imaging array, and a ranging image sensor.

In the first embodiment, the first detection unit 17 transmits detection information indicating that a reflected wave from a subject has been detected to the control unit 14 as a signal.

Note that the first detection unit 17 is only required to be able to detect an electromagnetic wave in the configuration that is a single element constituting the above-described distance measuring sensor, and does not need to be imaged on the detection surface. Therefore, the first detection unit 17 does not necessarily have to be provided in the vicinity of the imaging position of the imaging unit 15. In other words, in this configuration, the first detecting unit 17 can detect the third position of the prism 16 if the electromagnetic wave incident on the image forming unit 15 from an object point in the predetermined angle of view range α can be incident on the detecting surface. May be placed anywhere on the path of the electromagnetic wave that travels after exiting from the surface s3.

In FIG. 1, the radiating unit 12 may radiate, for example, at least one of infrared light, visible light, ultraviolet light, and radio waves. In the first embodiment, the radiating unit 12 radiates infrared rays. The radiating unit 12 may radiate the radiated electromagnetic wave directly or indirectly via the scanning unit 13 toward the target ob. In the first embodiment, the radiating unit 12 may radiate the radiated electromagnetic wave indirectly to the target ob via the scanning unit 13.

In the first embodiment, the radiating section 12 may radiate a beam-shaped electromagnetic wave having a small width, for example, 0.5 °. Further, in the first embodiment, the radiating unit 12 may radiate the electromagnetic wave in a pulse shape. For example, the radiating unit 12 includes, for example, an LED (Light Emitting).
Diode) and LD (Laser Diode). The radiating unit 12 may switch between radiating and stopping electromagnetic waves based on the control of the control unit 14 described below.

The scanning unit 13 has, for example, a reflecting surface that reflects the electromagnetic wave, and changes the radiation position of the electromagnetic wave applied to the target ob by reflecting the electromagnetic wave radiated from the radiation unit 12 while changing its direction. Good. That is, the scanning unit 13 may scan the target ob using the electromagnetic waves radiated from the radiation unit 12. Therefore, in the first embodiment, the first detection unit 17 may constitute a scanning distance measuring sensor in cooperation with the scanning unit 13. Note that the scanning unit 13 may scan the object ob in a one-dimensional direction or a two-dimensional direction. In the first embodiment, the scanning unit 13 scans the target ob in a two-dimensional direction.

The scanning unit 13 may be configured such that at least a part of the irradiation region of the electromagnetic wave radiated and reflected from the radiation unit 12 is included in the electromagnetic wave detection range of the electromagnetic wave detection device 10. Therefore, at least a part of the electromagnetic wave applied to the target ob via the scanning unit 13 can be detected by the electromagnetic wave detection device 10.

The scanning unit 13 includes, for example, a MEMS (Micro Electro Mechanical Systems) mirror, a polygon mirror, a galvano mirror, and the like. In the first embodiment, the scanning unit 13 includes a MEMS mirror.

The scanning unit 13 may change the direction in which the electromagnetic wave is reflected based on the control of the control unit 14 described later. The scanning unit 13 may include an angle sensor such as an encoder, for example, and may notify the control unit 14 of the angle detected by the angle sensor as direction information for reflecting electromagnetic waves. In such a configuration, the control unit 14 can calculate the radiation position based on the direction information acquired from the scanning unit 13. In addition, the control unit 14 can calculate the irradiation position based on a drive signal input to cause the scanning unit 13 to change the direction in which the electromagnetic wave is reflected.

In the first embodiment, the scanning unit 13 is configured such that at least a part of the irradiation area of the electromagnetic wave radiated from the radiation unit 12 and reflected by the scanning unit 13 is included in the detection range of the first detection unit 17. It is configured. Therefore, in the first embodiment, at least a part of the electromagnetic wave radiated to the target ob via the scanning unit 13 can be detected by the first detection unit 17.

The control unit 14 includes one or more processors and a memory. The processor may include at least one of a general-purpose processor that reads a specific program and executes a specific function, and a dedicated processor specialized for a specific process. The special purpose processor may include an application specific integrated circuit (ASIC; Application \ Specific \ Integrated \ Circuit). The processor may include a programmable logic device (PLD; Programmable Logic Device). The PLD may include an FPGA (Field-Programmable Gate Array). The control unit 14 may include at least one of an SoC (System-on-a-Chip) in which one or a plurality of processors cooperate, and a SiP (System \ In \ a \ Package).

The control unit 14 may acquire information about the periphery of the electromagnetic wave detection device 10 based on the detection result of the electromagnetic wave detected by the first detection unit 17. The information about the surroundings is, for example, image information, distance information, and temperature information. In the first embodiment, as described above, the control unit 14 acquires, as image information, the electromagnetic wave detected by the first detection unit 17 as an image. Further, in the first embodiment, the control unit 14 performs the ToF (Time-of-Flight) method based on the detection information detected by the first detection unit 17 in a ToF (Time-of-Flight) manner as described below. The distance information of the radiation position radiated to the camera may be acquired.

(3) As shown in FIG. 3, the control unit 14 radiates a pulsed electromagnetic wave to the radiating unit 12 by inputting the electromagnetic wave radiating signal to the radiating unit 12 (see the “Electromagnetic radiation signal” column). The radiating unit 12 irradiates an electromagnetic wave based on the input electromagnetic wave radiation signal (see the “radiation unit radiation amount” column). An electromagnetic wave emitted from the radiation unit 12 and reflected by the scanning unit 13 and applied to an arbitrary radiation region is reflected in the radiation region. When detecting the electromagnetic wave reflected in the radiation area and traveling through the imaging unit 15 and the prism 16 (see the “electromagnetic wave detection amount” column), the first detection unit 17 detects the detection information as described above. Is notified to the control unit 14.

The control unit 14 has, for example, a time measurement LSI (Large Scale Integrated circuit), and obtains detection information from the time T1 at which the radiation unit 12 emits the electromagnetic wave (see the “detection information acquisition” column). The time ΔT until T2 is measured. The control unit 14 calculates the distance to the radiation position by multiplying the time ΔT by the speed of light and dividing by 2. In addition, the control unit 14 calculates the radiation position based on the direction information acquired from the scanning unit 13 or the drive signal output to the scanning unit 13 as described above. The control unit 14 creates image-like distance information by calculating the distance to each radiation position while changing the radiation position.

In the first embodiment, as described above, the information acquisition system 11 is configured to generate distance information by using Direct @ ToF which directly radiates an electromagnetic wave and directly measures a time required to return. However, the information acquisition system 11 is not limited to such a configuration. For example, the information acquisition system 11 emits an electromagnetic wave at a fixed cycle, and obtains distance information by Flash @ ToF which indirectly measures a time until the electromagnetic wave is returned from a phase difference between the emitted electromagnetic wave and the returned electromagnetic wave. May be created. The information acquisition system 11 may create the distance information by another ToF method, for example, Phased @ ToF.

In the electromagnetic wave detection device 10 according to the first embodiment having the above-described configuration, the traveling direction of the first electromagnetic wave included in the bundle of first electromagnetic waves that has entered and passed the imaging unit 15 and the imaging unit 15 The angle between the second electromagnetic wave included in the bundle of the second electromagnetic waves that has entered and passed through and the traveling direction of the second electromagnetic wave is within a predetermined value. With such a configuration, the electromagnetic wave detection device 10 of the first embodiment reduces the spread of the electromagnetic waves radiated from a plurality of object points within the predetermined angle of view range α and transmitted through the imaging unit 15, and Is not reflected by the reflecting surface of the above, or is reflected by a reflecting surface other than the desired reflecting surface. For this reason, the electromagnetic wave detection device 10 can reduce the intersection of the electromagnetic wave with the traveling path of the electromagnetic wave that enters the imaging unit 15 within the predetermined angle of view range α and is reflected by the desired reflection surface. As a result, the position of the electromagnetic wave incident on the imaging unit 15 from the object point outside the predetermined angle of view range α and the position of the electromagnetic wave incident on the imaging unit 15 from the object point α within the predetermined angle of view range Reaching the same location can be reduced. Therefore, the electromagnetic wave detection device 10 can reduce ghost caused by the electromagnetic wave incident on the imaging unit 15 from an object point outside the predetermined angle of view range α, and can detect the electromagnetic wave with high accuracy. Note that such configurations and effects are the same for the electromagnetic wave detection devices according to the second to fifth embodiments to be described later.

The electromagnetic wave detection device 10 according to the first embodiment does not require the use of a light-shielding plate to reduce the number of electromagnetic waves intersecting on the detection surface of the detection unit 17. Therefore, a decrease in the amount of electromagnetic waves reaching the detection surface from the object point within the predetermined angle of view range α can be reduced. Note that such configurations and effects are the same for the electromagnetic wave detection devices according to the second to fifth embodiments to be described later.

In the first embodiment, the angle between the traveling direction of the electromagnetic wave included in the bundle of electromagnetic waves incident on and passing through the imaging unit 15 and the main axis of the imaging unit 15 is within a predetermined value. It is. With such a configuration, as described above, the electromagnetic wave detection device 10 according to the first embodiment allows the electromagnetic wave detection device 10 according to the first embodiment to move the object point within a predetermined angle of view range α to the image forming unit 15. The arrival of the incident electromagnetic wave and the electromagnetic wave incident on the imaging unit 15 from an object point outside the predetermined angle-of-view range α at the same position in the detection unit 17 can be reduced.

In the electromagnetic wave detection device 10 of the first embodiment, the imaging unit 15 forms an image-side telecentric optical system. With such a configuration, as described above, the electromagnetic wave detection device 10 according to the first embodiment is configured such that the electromagnetic wave incident on the imaging unit 15 from the object point in the predetermined angle of view range α And the electromagnetic wave incident on the imaging unit 15 from an object point outside the range of the angle of view α can reach the same position in the detection unit 17.

Further, the electromagnetic wave detection device 10 of the first embodiment includes a first surface s1, a second surface s2, and a third surface s3, and the first surface s1 detects electromagnetic waves incident from the imaging unit 15. Reflecting, the second surface s2 reflects the electromagnetic wave reflected by the first surface s1, and the third surface s3 emits the electromagnetic wave reflected by the second surface s2. For this reason, even if the angle between the main axis of the imaging unit 15 and the first surface s1 is close to 90 °, the electromagnetic wave detection device 10 can detect the electromagnetic wave reflected by the first surface s1 by the second surface s1. Can travel in a direction different from the direction toward the imaging unit 15 by the surface s2. Therefore, the electromagnetic wave detection device 10 can avoid the interference between the imaging unit 15 and the first detection unit 17 even when the angle between the second direction d2 and the first surface s1 approaches 90 °. As a result, the electromagnetic wave detection device 10 can avoid the restriction on the design of the first imaging unit 15 and can ensure good imaging characteristics of the first imaging unit 15. Note that such configurations and effects are the same for the electromagnetic wave detection device according to the third embodiment described later.

Next, an electromagnetic wave detection device according to the second embodiment of the present disclosure will be described. In the second embodiment, the configuration of the prism is different from that of the first embodiment. Hereinafter, the second embodiment will be described focusing on the differences from the first embodiment. Parts having the same configuration as the first embodiment are denoted by the same reference numerals.

電磁 As shown in FIG. 4, the electromagnetic wave detection device 100 according to the second embodiment includes an imaging unit 15, a prism 160, and a first detection unit 17. The configuration and functions of the information acquisition system 11 according to the second embodiment other than the electromagnetic wave detection device 100 are the same as those of the first embodiment. The configurations and functions of the imaging unit 15 and the first detection unit 17 of the electromagnetic wave detection device 100 according to the second embodiment are the same as those of the first embodiment.

に お い て In the second embodiment, the prism 160 has at least a first surface s10, a second surface s20, and a third surface s30. The prism 160 may have the first surface s10, the second surface s20, and the third surface s30 as different different surfaces. The prism 160 includes a rectangular prism, and the first surface s10, the second surface s2, and the third surface s30 may intersect each other.

The first surface s10 causes the electromagnetic wave traveling from the second surface s20 in the second direction d2 to travel in the fifth direction d5. For example, the first surface s10 may internally reflect an electromagnetic wave that has traveled in the second direction d2 from the second surface s20 and travel in the fifth direction d5. Furthermore, the first surface s10 may cause the electromagnetic wave traveling from the second surface s20 in the second direction d2 to be totally internally reflected and travel in the fifth direction d5. The first surface s10 has a distance at which the electromagnetic wave incident from the second surface s20 and reflected by the first surface s10 can reach the third surface s30 instead of the second surface s20. Away from

The second surface s20 allows the electromagnetic wave incident on the prism 16 from the first direction d1 to travel in the second direction d2. The second surface s20 may be perpendicular to the traveling axis of the electromagnetic wave incident on the second surface s20 from the first direction d1. As described above, since the first direction d1 is parallel to the main axis of the imaging unit 15, the main axis of the imaging unit 15 is perpendicular to the second surface s20, in other words, the main surface of the imaging unit 15 and the second surface s20. The plane s20 may be parallel. The second surface s20 may transmit or refract an electromagnetic wave incident from the first direction d1 to travel in the second direction d2.

電磁 The third surface s30 emits, from the prism 16, an electromagnetic wave traveling from the first surface s1 in the fifth direction d5. The third surface s30 may be perpendicular to the traveling axis of the electromagnetic wave traveling in the fifth direction d5 from the second surface s20, that is, perpendicular to the fifth direction d5.

Next, an electromagnetic wave detection device according to a third embodiment of the present disclosure will be described. In the third embodiment, the configuration of the prism is different from that of the second embodiment. Hereinafter, the third embodiment will be described focusing on the differences from the second embodiment. Parts having the same configuration as the second embodiment are denoted by the same reference numerals.

電磁 As shown in FIG. 5, the electromagnetic wave detection device 101 according to the third embodiment has an imaging unit 15, a prism 161, and a first detection unit 17. The configuration and functions of the information acquisition system 11 according to the third embodiment other than the electromagnetic wave detection device 101 are the same as those of the first embodiment. The configuration and functions of the third embodiment other than the prism 161 are the same as those of the second embodiment.

In the third embodiment, the prism 161 has at least a first surface s10, a second surface s20, a third surface s30, and the reflection suppressing unit 22. In the third embodiment, the configurations and functions of the first surface s10, the second surface s20, and the third surface s30 are the same as those in the second embodiment.

In the third embodiment, the reflection suppressing unit 22 suppresses the reflection of the electromagnetic wave at a position other than the traveling path of the electromagnetic wave incident on the imaging unit 15 from the object point in the predetermined angle of view range α. The reflection suppressing unit 22 may, for example, suppress the reflection of the electromagnetic wave by absorbing the electromagnetic wave. In the third embodiment, the reflection suppressing unit 22 is a portion of the prism on which black paint is applied. The reflection suppressing unit 22 may be a black plate-like member arranged on the incident surface of the prism on the electromagnetic wave. The reflection suppressing unit 22 may be a member having a sanding surface, a spherical surface, an aspheric surface, or an uneven surface that suppresses reflection of electromagnetic waves.

The reflection suppressing unit 22 is arranged in a region other than a region of the traveling path of the prism 161 where the electromagnetic wave travels from the object point within the predetermined angle of view range α in the traveling path of the electromagnetic wave. . For example, the reflection suppressing unit 22 is disposed on a seventh surface s7 that is an interface of the prism 161.

In the third embodiment, as in the second embodiment, the first surface s10, the second surface s20, and the third surface s30 allow the electromagnetic waves incident on the imaging unit 15 to travel. Thereby, the electromagnetic wave enters the prism 161 from the first direction d1 on the second surface s20, and travels in the second direction d2. Then, the electromagnetic wave traveling in the second direction d2 travels in the fifth direction d5 by the first surface S10. Further, the electromagnetic wave traveling in the fifth direction d5 is emitted from the prism 161 through the third surface S30.

The electromagnetic wave detection device 101 according to the third embodiment having the above-described configuration includes the reflection suppression unit 22 that suppresses the reflection of the electromagnetic wave at a position other than the traveling path of the electromagnetic wave incident from the object point in the predetermined angle of view range α. And a prism having the same. For this reason, the reflection suppressing unit 22 is disposed at a position on the traveling path of the electromagnetic wave incident from an object point outside the predetermined angle of view range α, and the electromagnetic wave detecting device 101 It is possible to suppress the reflection of the electromagnetic wave incident from an object point outside the range α. For this reason, the electromagnetic wave detection device 102 is configured such that the electromagnetic wave that enters from an object point outside the predetermined angle of view range α and reaches the interface is the first electromagnetic wave that enters from the object point within the predetermined angle of view range α. Reaching the same position as the position in the detection unit 17 can be reduced. As a result, the electromagnetic wave detection device 101 can reduce ghosts and flares caused by electromagnetic waves incident on the imaging unit 15 from object points outside the predetermined angle-of-view range α, and can detect electromagnetic waves with high accuracy.

Next, an electromagnetic wave detection device according to a fourth embodiment of the present disclosure will be described. In the fourth embodiment, the configuration of the prism is different from that of the second embodiment. Hereinafter, the fourth embodiment will be described focusing on the differences from the second embodiment. Parts having the same configuration as the second embodiment are denoted by the same reference numerals.

電磁 As shown in FIG. 6, the electromagnetic wave detection device 102 according to the fourth embodiment has an imaging unit 15, a prism 162, and a first detection unit 17. The configuration and functions of the information acquisition system 11 according to the fourth embodiment other than the electromagnetic wave detection device 102 are the same as those of the first embodiment. The configuration and functions of the fourth embodiment other than the prism 162 are the same as those of the second embodiment.

に お い て In the fourth embodiment, the prism 162 has at least a first surface s11, a second surface s21, and a third surface s30. In the fourth embodiment, the configuration and function of the third surface s30 are the same as those in the second embodiment.

The prism 162 may have the first surface s11, the second surface s21, and the third surface s30 as different different surfaces. The prism 162 includes a rectangular prism, and the first surface s11, the second surface s21, and the third surface s30 may intersect each other.

プ リ ズ ム In the fourth embodiment, the prism 162 has the reflection suppressing unit 220. The reflection suppressing unit 220 suppresses reflection of electromagnetic waves. The reflection suppressing unit 220 includes a region in the prism 162 from the traveling path of the electromagnetic wave incident on the imaging unit 15 to the interface. Specifically, the reflection suppressing unit 220 is a region of the prism 162 from the end of the region where the electromagnetic wave incident on the imaging unit 15 can travel to the interface. More specifically, the reflection suppressing unit 220 is a region in the prism 162 from the end of the region where the electromagnetic wave incident on the imaging unit 15 can travel to the interface. In other words, after the linear electromagnetic wave incident on the imaging unit 15 at the widest angle of view is incident on the second surface s21, the reflection suppressing unit 220 does not reach the other interface, but the first surface s11 Is the area of the prism 162 that can be reached. The distance L from the traveling path of the electromagnetic wave to the interface of the prism 162 is equal to or longer than a predetermined distance.

The first surface s11 is a region where the electromagnetic wave incident on the image forming unit 15 from an object point within a predetermined angle of view range α and is incident on the prism 162 on the second surface s21 is reflected. And a region constituting the unit 220. The first surface s11 causes an electromagnetic wave traveling in the second direction d2 from the second surface s21 to travel in the fifth direction d5. For example, the first surface s11 may internally reflect an electromagnetic wave traveling in the second direction d2 from the second surface s21 and cause the electromagnetic wave to travel in the fifth direction d5. Further, the first surface s11 may cause the electromagnetic wave traveling in the second direction d2 from the second surface s21 to be totally internally reflected and travel in the fifth direction d5.

２The second surface s21 includes a region through which the electromagnetic wave incident on the imaging unit 15 from an object point in the predetermined angle of view range α is transmitted, and a region constituting the reflection suppressing unit 220 continuous with the region. The second surface s21 reflects an electromagnetic wave traveling in the second direction d2 and causes the electromagnetic wave to travel in the fifth direction d5. The second surface s20 causes the electromagnetic wave incident on the prism 162 from the first direction d1 to travel in the second direction d2. The second surface s21 may be perpendicular to the traveling axis of the electromagnetic wave incident on the second surface s21 from the first direction d1. As described above, since the first direction d1 is parallel to the main axis of the imaging unit 15, the main axis of the imaging unit 15 is perpendicular to the second surface s21, in other words, the main surface of the imaging unit 15 and the second surface s21. The plane s21 may be parallel. The second surface s21 may transmit or refract an electromagnetic wave incident from the first direction d1 to travel in the second direction d2.

In the electromagnetic wave detection device 102 according to the fourth embodiment having the above-described configuration, the reflection suppressing unit 220 determines the area of the prism 162 from the traveling path of the electromagnetic wave incident from an object point within a predetermined angle of view range α to the interface. Including, the distance from the traveling path to the interface is equal to or longer than a predetermined distance. Since the distance from the traveling path of the electromagnetic wave incident from the object point in the predetermined angle of view range α to the interface is greater than or equal to the predetermined distance, the electromagnetic wave reflected at the interface other than the desired reflection surface can be reduced. . Therefore, the electromagnetic wave detection device 102 can reduce the electromagnetic waves reflected at the interface that has entered the prism 162 from an object point outside the predetermined angle-of-view range α. As a result, the electromagnetic wave detection device 102 performs the first detection in which the electromagnetic wave from an object point outside the predetermined angle of view range α reaches the electromagnetic wave incident on the prism 162 from the object point within the predetermined angle of view range α. Reaching the same position as the position in the part 17 can be reduced. Therefore, the electromagnetic wave detection device 101 can reduce ghost caused by the electromagnetic wave incident on the imaging unit 15 from an object point outside the predetermined angle of view range α, and can detect the electromagnetic wave with high accuracy.

Next, an electromagnetic wave detection device according to a fifth embodiment of the present disclosure will be described. The fifth embodiment differs from the first embodiment in that the electromagnetic wave detection device includes a traveling unit and a second detection unit. In the fifth embodiment, the configuration of the prism is different from that of the first embodiment. Hereinafter, the fifth embodiment will be described focusing on the differences from the first embodiment. Parts having the same configuration as the first embodiment are denoted by the same reference numerals.

As shown in FIG. 7, the electromagnetic wave detection device 103 according to the fifth embodiment includes an imaging unit 15, a prism unit 163, a first detection unit 17, a traveling unit 20, and a second detection unit 21. ing. The configuration and functions of the information acquisition system 11 according to the fifth embodiment other than the electromagnetic wave detection device 103 are the same as those of the first embodiment. The configurations and functions of the imaging unit 15 and the first detection unit 17 in the electromagnetic wave detection device 103 of the fifth embodiment are the same as those of the first embodiment.

The advancing unit 20 is provided on a path of an electromagnetic wave that enters from the second surface s2 of the prism unit 163 and exits from the fourth surface s4. Further, the advancing unit 20 may be provided at or near the primary imaging position of the target ob which is separated from the imaging unit 15 by a predetermined distance.

In the fifth embodiment, the advancing unit 20 is provided at the primary imaging position. The advancing unit 20 has a reference surface ss on which the electromagnetic wave passing through the imaging unit 15 and the prism unit 163 is incident. The reference plane ss is configured by a plurality of pixels px arranged along a two-dimensional shape. The reference surface ss is a surface that causes an electromagnetic wave to have an action such as reflection and transmission in at least one of a first state and a second state described later. The advancing unit 20 may form an image of the electromagnetic wave of the target ob by the imaging unit 15 on the reference plane ss. The reference plane ss may be perpendicular to the traveling axis of the electromagnetic wave emitted from the fourth plane s4.

The reference plane ss is arranged on the traveling path of the electromagnetic wave incident on the imaging unit 15 from an object point within a predetermined angle of view range α. The plurality of pixels px are arranged on the traveling path of the electromagnetic wave incident on the imaging unit 15 from an object point in a predetermined angle of view range α.

The advancing unit 20 causes the electromagnetic wave emitted from the fourth surface s4 and incident on the reference surface ss to travel in a specific direction for each pixel px. The advancing unit 20 sets, for each pixel px, a first state of advancing in the first selection direction ds1 as a specific direction and a second state of advancing in the second selection direction ds2 as another specific direction. It can be switched. In the fifth embodiment, the first state includes a first reflection state in which an electromagnetic wave incident on the reference surface ss is reflected in a first direction d1. Further, the second state includes a second reflection state in which the electromagnetic wave incident on the reference surface ss is reflected in the second direction d2.

In the fifth embodiment, more specifically, the advancing unit 20 may include a reflection surface that reflects an electromagnetic wave for each pixel px. The advancing unit 20 may switch the first reflection state and the second reflection state for each pixel px by changing the direction of the reflection surface for each pixel px.

In the fifth embodiment, the advancing unit 20 is, for example, a DMD (Digital Micro).
(mirror Device: digital micromirror device). The DMD can switch the reflection surface to any one of + 12 ° and −12 ° with respect to the reference surface ss for each pixel px by driving the minute reflection surface forming the reference surface ss. . Note that the reference surface ss may be parallel to the plate surface of the substrate on which the minute reflecting surface of the DMD is placed.

The advancing unit 20 may switch the first state and the second state for each pixel px based on the control of the control unit 14 described later. For example, the traveling unit 20 can simultaneously advance an electromagnetic wave incident on the pixel px in the first selection direction ds1 by switching a part of the pixels px to the first state, and change another part of the pixels px. By switching to the second state, the electromagnetic wave incident on the pixel px can be advanced in the second selection direction ds2.

The prism unit 163 is provided between the imaging unit 15 and the traveling unit 20. The prism unit 163 separates the electromagnetic wave traveling from the image forming unit 15 and emits the electromagnetic wave toward the first detection unit 17 and the traveling unit 20. The prism unit 163 emits the electromagnetic wave whose traveling direction has been changed by the traveling unit 20 toward the second detection unit 21. The detailed structure of the prism section 163 will be described below.

In the fifth embodiment, the prism unit 163 includes at least a first surface s12, a second surface s2, a third surface s3, a fourth surface s4, a fifth surface s5, and a sixth surface s6. Have. In the fifth embodiment, the configurations and functions of the first surface s1 and the third surface s3 are the same as those in the first embodiment.

プ リ ズ ム In the fifth embodiment, the prism section 163 has a first prism 163a, a second prism 163b, and a third prism 163c.

機能 The function and configuration of the first prism 163a are the same as those of the prism 16 of the first embodiment.

２The second prism 163b may have at least the fourth surface s4, the fifth surface s5, and the sixth surface s6 as different different surfaces. The second prism 163b includes, for example, a rectangular prism, and the fourth surface s4 and the fifth surface s5 may intersect with the sixth surface s6.

The second prism 163b may be arranged such that the fifth surface s5 faces the first surface s12 of the first prism 163a. In addition, the second prism 163b is connected to the first surface s12 of the first prism 163a, and the fourth surface in the traveling direction of the electromagnetic wave traveling inside the second prism 163b via the fifth surface s5 via the fifth surface s5. It may be arranged so that s4 is located. The second prism 163b is arranged such that the sixth surface s6 is located in the eighth direction d8, which is a reflection angle equal to the incident angle of the electromagnetic wave from the seventh direction d7 on the fifth surface s5. May be.

５The fifth surface s51 internally reflects the electromagnetic wave traveling inside the second prism 163b with the seventh direction d7 as the traveling axis and causes the electromagnetic wave to travel in the eighth direction d8. In the configuration in which the incident angle of the electromagnetic wave from the seventh direction d7 is equal to or larger than the critical angle, the fifth surface s5 totally internally reflects the electromagnetic wave traveling internally in the seventh direction d7 and moves in the eighth direction d8. Let go.

３The third prism 163c may be arranged between the first prism 163a and the second prism 163b.

For example, the third prism 163c is arranged close to the second prism 163b via the air layer. Further, the third prism 163c may be disposed between the first prism 163a and the second prism 163b via an air layer by disposing a spacer between the third prism 163c and the second prism 163b. . In such a configuration, the above-described second prism 163b may have an arbitrary refractive index larger than the refractive index of the air layer so that the electromagnetic wave is internally reflected by the fifth surface s5.

The third prism 163c may be arranged so as to be in surface contact with the second prism 163b at the fifth surface s5. In such a configuration, the second prism 163b has a refractive index larger than the refractive index of the third prism 163c so that the electromagnetic wave is internally reflected by the fifth surface s5.

In the fifth embodiment, the first surface s12 separates the electromagnetic wave traveling in the second direction d2 from the second surface s2 and causes the electromagnetic wave to travel in the third direction d3 and the sixth direction d6. The first surface s12 makes the electromagnetic wave of a specific wavelength among the electromagnetic waves that have traveled in the second direction d2 travel in the third direction d3, and makes the electromagnetic waves other than the specific wavelength band travel in the sixth direction d6. Good. The first surface s12 reflects an electromagnetic wave of a specific wavelength out of the electromagnetic waves that have traveled in the second direction d2 to travel in the third direction d3, and transmits or refracts electromagnetic waves outside the specific wavelength band to form a sixth surface. In the direction d6. The angle of incidence of the electromagnetic wave traveling in the second direction d2 on the first surface s12 may be less than the critical angle.

(4) The fourth surface s4 emits the electromagnetic wave traveling in the sixth direction d6 from the first surface s12 to the reference surface ss of the traveling unit 20. In addition, the fourth surface s4 travels in the first selection direction ds1 as a specific direction from the reference surface ss of the advancing part 20, and re-enters the electromagnetic wave in the seventh direction d7. The fourth surface s4 may be perpendicular to the traveling axis of the electromagnetic wave traveling in the sixth direction d6 from the first surface s12, that is, perpendicular to the sixth direction d6. The fourth plane s4 may be parallel to the reference plane ss of the traveling section 20. The fourth surface s4 may transmit or refract an electromagnetic wave that is re-entered from the reference surface ss and travel in the seventh direction d7.

(5) The fifth surface s5 allows the electromagnetic wave traveling from the fourth surface s4 in the seventh direction d7 to travel in the eighth direction d8. For example, the fifth surface s5 may internally reflect an electromagnetic wave traveling in the seventh direction d7 from the fourth surface s4 and cause the electromagnetic wave to travel in the eighth direction d8. Furthermore, the fifth surface s5 may cause the electromagnetic wave traveling from the fourth surface s4 in the seventh direction d7 to be totally internally reflected and travel in the eighth direction d8. The incident angle of the electromagnetic wave traveling from the fourth surface s4 to the fifth surface s5 in the seventh direction d7 may be equal to or greater than the critical angle. The incident angle of the electromagnetic wave traveling in the seventh direction d7 from the fourth surface s4 to the fifth surface s5 is determined by the angle of incidence of the electromagnetic wave traveling in the second direction d2 from the second surface s2 to the first surface s12. It may be different from the angle of incidence.

６The sixth surface s6 is a second emission surface that emits an electromagnetic wave traveling in the eighth direction d8 from the fifth surface s5. The sixth surface s6 may be perpendicular to the traveling axis of the electromagnetic wave traveling in the eighth direction d8 from the fifth surface s5, that is, perpendicular to the eighth direction d8.

The second detection unit 21 detects the electromagnetic wave emitted from the first surface s12. In the fifth embodiment, the second detection unit 21 detects the electromagnetic wave emitted from the first surface s1 and then traveling through the traveling unit 20 and emitted from the sixth surface s6. In order to detect the electromagnetic wave emitted from the sixth surface s6, the second detector 21 detects the electromagnetic wave that travels from the prism portion 163 in the eighth direction d8 and then travels from the sixth surface s6. It may be located on the route. The second detection unit 2 is arranged such that the electromagnetic wave detectable area overlaps the traveling path of the electromagnetic wave incident on the imaging unit 15 from an object point within a predetermined angle of view range α. The second detection unit 21 may be arranged at the secondary imaging position or near the secondary imaging position of the electromagnetic wave image formed on the reference surface ss of the traveling unit 20.

The second detector 21 may be arranged so that the detection surface is parallel to the sixth surface s6. As described above, the sixth surface s6 can be perpendicular to the traveling axis of the electromagnetic wave that travels and exits in the eighth direction d8, and the detection surface of the second detection unit 21 is different from the sixth surface s6. It may be perpendicular to the traveling axis of the emitted electromagnetic wave.

In the fifth embodiment, the second detection unit 21 is a sensor of a different type or the same type as the first detection unit 17, and detects a different type or the same type of electromagnetic wave.

The second detection unit 21 is only required to be able to detect an electromagnetic wave in a single element constituting the distance measurement sensor, and does not need to form an image on the detection surface. Therefore, the second detection unit 21 does not necessarily need to be provided at the secondary imaging position or near the secondary imaging position. That is, in this configuration, if the electromagnetic wave incident on the imaging unit 15 from an object point in the predetermined angle of view range α can enter the detection surface, the second detection unit 21 6 may be arranged anywhere on the path of the electromagnetic wave that travels after being emitted from the surface s6.

{Circle around (2)} The second detection unit 21 transmits detection information indicating that the reflected wave from the subject has been detected to the control unit 14 as a signal.

Although the present invention has been described with reference to the drawings and embodiments, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

For example, in the first to fifth embodiments, the radiation unit 12, the scanning unit 13, and the control unit 14 configure the information acquisition system 11 together with the electromagnetic wave detection devices 10, 100, 101, 102, and 103. However, the electromagnetic wave detection devices 10, 100, 101, 102, and 103 may be configured to include at least one of them.

In the fifth embodiment, the traveling unit 20 can switch the traveling direction of the electromagnetic wave incident on the reference surface ss into two directions, a first selection direction ds1 and a second selection direction ds2. May be switchable in three or more directions.

Further, in the fifth embodiment, the first state and the second state are a first reflection state in which the electromagnetic wave incident on the reference surface ss is reflected in the first selection direction ds1, and a second reflection state, respectively. Although this is the second reflection state in which the light is reflected in the selection direction ds2, another mode may be used.

For example, as shown in FIG. 8, the second state may be a transmission state in which electromagnetic waves incident on the reference surface ss are transmitted and travel in the second selection direction ds2. More specifically, the prism 167 may include a shutter having a reflection surface that reflects an electromagnetic wave in the first selection direction ds1 for each pixel px. In the prism 167 having such a configuration, the reflection state as the first state and the transmission state as the second state can be switched for each pixel px by opening and closing the shutter for each pixel px.

進行 As the traveling section 20 having such a configuration, for example, a switching section including a MEMS shutter in which a plurality of shutters that can be opened and closed is arranged in an array is exemplified. Further, as the advancing unit 20, a switching unit including a liquid crystal shutter capable of switching between a reflection state in which electromagnetic waves are reflected and a transmission state in which electromagnetic waves are transmitted in accordance with the liquid crystal orientation is exemplified. In the traveling section 20 having such a configuration, the reflection state as the first state and the transmission state as the second state can be switched for each pixel px by switching the liquid crystal alignment for each pixel px.

In the first to fifth embodiments, the information acquisition system 11 scans the second detection unit 21 by causing the scanning unit 13 to scan the beam-shaped electromagnetic waves emitted from the emission unit 12. It has a configuration to function as a scanning type active sensor in cooperation with the unit 13. However, the information acquisition system 11 is not limited to such a configuration. For example, in a radiating unit 12 having a plurality of radiation sources capable of radiating a radial electromagnetic wave, a scanning type active without a scanning unit 13 is provided by a phased scanning method in which electromagnetic waves are radiated from each radiation source while shifting the radiation timing. With the configuration that functions as a sensor, effects similar to those of the first to fifth embodiments can be obtained. Further, for example, even in a configuration in which the information acquisition system 11 does not include the scanning unit 13 and emits a radial electromagnetic wave from the radiation unit 12 to acquire information without scanning, the information acquisition system 11 includes the first to fifth embodiments. A similar effect is obtained.

In addition, in the fifth embodiment, the information acquisition system 11 has a configuration in which the first detection unit 17 is a passive sensor and the second detection unit 21 is an active sensor. However, the information acquisition system 11 is not limited to such a configuration. For example, in the information acquisition system 11, an effect similar to that of the fifth embodiment can be obtained regardless of whether the first detection unit 17 and the second detection unit 21 are both active sensors or passive sensors. In a configuration in which the first detection unit 17 and the second detection unit 21 are both active sensors, the radiating units 12 that radiate the electromagnetic wave to the target ob may be different or the same. Further, different radiating parts 12 may radiate different or the same type of electromagnetic waves, respectively.

10, 100, 101, 102, 103 Electromagnetic wave detection device 11 Information acquisition system 12 Emission unit 13 Scanning unit 14 Control unit 15 Imaging unit 16, 160, 161, 162 Prism 163 Prism unit 163a First prism 163b Second prism 163c Third prism 17 First detection unit 20 Progression unit 21 Second detection unit 22, 220 Reflection suppression unit d1, d2, d3, d4, d5, d6, d7, d8 First direction, second direction , Third direction, fourth direction, fifth direction, sixth direction, seventh direction, eighth direction ds1, ds2 first selection direction, second selection direction ob target px pixel s1, s10, s11, s12 First surface s2, s20, s21 Second surface s3, s30 Third surface s4, s5, s6, s7 Fourth surface, fifth surface, sixth surface, seventh surface Face ss reference plane

Claims (33)

1. An imaging unit for imaging an incident electromagnetic wave;
   A prism including a reflection surface that reflects the electromagnetic wave incident from the imaging unit, and a first emission surface that emits the electromagnetic wave reflected by the reflection surface;
   A first detection unit that detects an electromagnetic wave emitted from the first emission surface;
   With
   The traveling direction of the first electromagnetic wave included in the bundle of the first electromagnetic waves incident on and passing through the imaging unit, and the second direction included in the bundle of the second electromagnetic waves incident on and passing through the imaging unit. The angle between the electromagnetic wave and the traveling direction is within a predetermined value,
   The electromagnetic wave detectable region by the first detection unit is arranged only on a traveling path of the electromagnetic wave incident from a predetermined angle of view range,
   Electromagnetic wave detection device.
2. An imaging unit for imaging an incident electromagnetic wave;
   A prism including a reflection surface that reflects the electromagnetic wave incident from the imaging unit, and a first emission surface that emits the electromagnetic wave reflected by the reflection surface;
   A first detection unit that detects an electromagnetic wave emitted from the first emission surface;
   With
   The angle between the traveling direction of the electromagnetic wave included in the bundle of electromagnetic waves incident on and passing through the imaging unit and the main axis of the imaging unit is within a predetermined value,
   The electromagnetic wave detectable region by the first detection unit is arranged only on a traveling path of the electromagnetic wave incident from a predetermined angle of view range,
   Electromagnetic wave detection device.
3. The angle is within 15 °;
   The electromagnetic wave detection device according to claim 1.
4. The angle is 0 °;
   The electromagnetic wave detection device according to claim 1.
5. The imaging unit constitutes an image-side telecentric optical system,
   The electromagnetic wave detection device according to claim 1.
6. The reflection surface includes a first reflection surface and a second reflection surface,
   The first reflection surface reflects an electromagnetic wave incident from the imaging unit,
   The second reflection surface reflects the electromagnetic wave reflected by the first reflection surface,
   The first emission surface emits the electromagnetic wave reflected by the second reflection surface,
   The electromagnetic wave detection device according to claim 1.
7. The prism includes a reflection suppression unit that suppresses reflection of electromagnetic waves at positions other than the traveling path,
   The electromagnetic wave detection device according to claim 1.
8. The reflection suppressing section is provided at an interface at the position.
   The electromagnetic wave detection device according to claim 1.
9. The distance from the traveling path to the interface is equal to or longer than a predetermined distance.
   An electromagnetic wave detection device according to claim 8.
10. The reflection suppressing unit includes a region from the traveling path of the prism to the interface,
    The distance from the traveling path to the interface is equal to or longer than a predetermined distance.
    The electromagnetic wave detection device according to claim 7.
11. The reflection surface reflects an electromagnetic wave of a specific wavelength band and emits an electromagnetic wave other than the specific wavelength band,
    The electromagnetic wave detection device according to claim 1.
12. A second detection unit that detects the electromagnetic wave emitted by the reflection surface,
    An electromagnetic wave detection device according to claim 11.
13. A second emission surface that emits the electromagnetic wave emitted by the reflection surface,
    The second detection unit detects an electromagnetic wave emitted from the second emission surface,
    An electromagnetic wave detection device according to claim 12.
14. A region where the electromagnetic wave can be detected by the second detection unit is arranged only on the traveling path,
    An electromagnetic wave detection device according to claim 12.
15. The second detection unit includes a sensor of the same type or a different type from the first detection unit,
    An electromagnetic wave detection device according to any one of claims 12 to 14.
16. The second detection unit detects the same type or different types of electromagnetic waves as the first detection unit,
    An electromagnetic wave detection device according to any one of claims 12 to 15.
17. A plurality of pixels are arranged along a reference plane, and a traveling unit that causes an electromagnetic wave emitted from the second emission plane and incident on the reference plane to travel in a specific direction for each pixel,
    With
    The second detection unit detects an electromagnetic wave that has traveled in the specific direction,
    An electromagnetic wave detection device according to any one of claims 12 to 16.
18. The reference plane is arranged only on the traveling path,
    The electromagnetic wave detection device according to claim 17.
19. The plurality of pixels are arranged only on the traveling path,
    An electromagnetic wave detection device according to claim 17.
20. The advancing unit includes a first reflection state in which the electromagnetic wave incident on the reference surface is reflected in the specific direction, and a second reflection state in which the electromagnetic wave is reflected in a direction different from the specific direction. Switch,
    The electromagnetic wave detection device according to claim 17.
21. The advancing unit includes a reflection surface that reflects an electromagnetic wave for each of the pixels, and switches between the first reflection state and the second reflection state by changing an orientation of the reflection surface for each of the pixels.
    The electromagnetic wave detection device according to claim 20.
22. The advancing unit includes a digital micromirror device,
    An electromagnetic wave detection device according to any one of claims 17 to 21.
23. The advancing unit switches between a transmission state where the electromagnetic wave incident on the reference surface is transmitted and a reflection state where the electromagnetic wave is reflected,
    The electromagnetic wave detection device according to claim 17.
24. 24. The advancing unit according to claim 23, wherein the advancing unit includes a shutter including a reflection surface that reflects an electromagnetic wave for each of the pixels, and switches between the reflection state and the transmission state by opening and closing the shutter for each of the pixels. Electromagnetic wave detection device.
25. The advancing unit includes a MEMS shutter in which the shutters are arranged in an array.
    The electromagnetic wave detection device according to claim 23 or 24.
26. The advancing unit includes a liquid crystal shutter capable of switching the reflection state and the transmission state for each pixel according to liquid crystal light distribution.
    The electromagnetic wave detection device according to claim 25.
27. The first detection unit includes at least one of a distance measurement sensor, an image sensor, and a thermo sensor,
    The electromagnetic wave detection device according to any one of claims 1 to 26.
28. 28. The electromagnetic wave detection device according to claim 1, wherein the electromagnetic wave includes at least one of infrared light, visible light, ultraviolet light, and radio wave.
29. A control unit that obtains information on surroundings based on a detection result of the electromagnetic wave by the first detection unit;
    An electromagnetic wave detection device according to any one of claims 1 to 28.
30. A control unit that obtains information on surroundings based on a detection result of the electromagnetic wave by the second detection unit;
    The electromagnetic wave detection device according to any one of claims 12 to 26.
31. The control unit acquires at least one of image information, distance information, and temperature information as the information about the surroundings,
    The electromagnetic wave detection device according to claim 29.
32. An electromagnetic wave detection device according to any one of claims 1 to 28,
    A control unit that obtains information about the surroundings based on a detection result of the electromagnetic wave by the first detection unit;
    Comprising,
    Information acquisition system.
33. An electromagnetic wave detection device according to any one of claims 12 to 26,
    A control unit configured to acquire information on surroundings based on a detection result of the electromagnetic wave by the first detection unit and the second detection unit;
    Comprising,
    Information acquisition system.

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