JP2008204047A - Display detection device and light detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve virtual display and the obstacle detection of a virtual display section by simple configurations, and to achieve obstacle detection with high position precision. <P>SOLUTION: This display detection device is provided with a light emission light source 1A for emitting visible rays of light 10A; an image formation optical system 2 for forming the image of the light emission part of the light emission light source 1A, and for displaying a virtual emission part 4A on a free space; and a light detector 3 for, when there exists an obstacle 5 in the neighborhood of the virtual light emission part 4A, detecting the rays of light emitted by the light emission light source 1A, and distributed/reflected by the obstacle 5. The light source for virtual display and the light source for obstacle detection are made common so that this display detection device can be configured of the smaller number of components compared with the case using different light sources, and made compact. The image of the light emission part is formed of the image formation optical system 2 to detect an obstacle so that only when the obstacle 5 comes to the neighborhood of the specific position on the free space, it is possible to highly precisely detect this. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display detection device and a light detection device for detecting an obstacle in free space.

  If a virtual image (phantom) is displayed in a free space using a 3D (3 Dimensional) display device or the like, the displayed image is not a substance, and of course, the image cannot be touched. However, if someone tries to touch the virtual image with their finger, if there is an action or reaction as if they had touched the virtual image, it would certainly be Reality must be much bigger. If such a thing can be done, it should be possible to make it appear as if some device is operated through the virtual image. In other words, it should be possible to make a virtual image without an entity work as an actual interface.

  Conventionally, for example, there are devices described in Non-Patent Documents 1 and 2 as such an interface. FIG. 20 shows a conceptual diagram thereof. This apparatus includes a two-dimensional display 101, a 3D lens 102, a spatial sensor device 103, and a PC (personal computer) 105. The 3D lens 102 includes a plurality of microlenses arranged in an array. In this apparatus, an image displayed on the two-dimensional display 101 is condensed by the 3D lens 102 and formed on a virtual screen 104 that is a space in front of the lens. The space sensor device 103 is arranged around the virtual screen 104 and detects the position of an obstacle (finger). The position data is sent to the PC 105, and a stereoscopic video user interface system is constructed by drawing processing in real time and reflecting it in the display on the two-dimensional display 101. The spatial sensor device 103 is considered to be realized by arranging a light source for detection and an optical sensor around the virtual screen 104.

  In addition, there is a device called virtual keyboard (http://www.vkb-tech.com/default.php). This is said to enable comfortable text input in a mobile environment by combining with a PDA (Personal Digital Assistant) or a mobile phone. FIG. 21 shows an overall conceptual diagram thereof. 22A and 22B show the internal configuration. As shown in FIGS. 22A and 22B, this apparatus outputs a projection device 201 that projects a keyboard pattern 301 onto an object to be projected 300, and invisible detection light 302 on a portion where the keyboard pattern 301 is displayed. A light output device 203 for detection, and a detection device 202 for detecting an obstacle (finger) 303 on the keyboard pattern 301. The detection device 202 includes a camera module, and detects the reflected light when the detection light 302 from the light output device 203 is blocked by an obstacle (finger) 303. In this apparatus, the virtual projection screen 104 is not formed in the free space as in the apparatus shown in FIG. 20 described above, but an actual projection object 300 such as a screen is required to project the keyboard pattern 301. Patent Documents 1 to 5 disclose techniques related to this apparatus.

Dai Ishikawa, “Proposal of a miniature garden-like presence and development of a small stereoscopic display without glasses”, PIONEER R & D, Vol. 12, no. 3, p. 47-58 Pioneer Co., Ltd. press release, "-Further development of autostereoscopic system" 3D Floating Vision "-Development of 3D video user interface" Floating Interface "that can draw pictures in the air and operate the windows in the air" [online] , September 30, 2005, Internet <URL: http://www.pioneer.co.jp/press/release512-j.html> US Pat. No. 6,650,318 US Pat. No. 7,084,857 US Patent Application Publication No. 2002/0075240 US Patent Application Publication No. 2006/0187198 US Patent Application Publication No. 2002/0187199

  As described above, conventionally, there is an apparatus that displays a virtual image and performs optical sensing at a place where the virtual image is displayed. The characteristic point of the conventional apparatus is that the light source for image display and the light source for sensing exist separately, and the light for image display propagates from the light source to the target location (position where the image is displayed). This is that the optical path and the optical path from the light source to the destination are completely independent and different. Because of this feature, conventionally, various problems and restrictions are often caused when an apparatus is actually configured. For example, there is a problem of the number of parts. Since the optical system component for virtual image display and the optical system component for sensing are completely independent, both optical systems must be prepared. For this reason, the number of parts will increase. There is also a problem of compactness. Since it is necessary to arrange the optical systems independently, each space is required, and the scale of the apparatus becomes large. There is also an alignment problem. High-precision alignment is required so that the sensing light is accurately guided to the place where the virtual image is displayed. In addition, when the position where the virtual image is displayed is not fixed, or when the sensing position is not fixed, the respective problems as described above are extremely increased. With difficulty. For this reason, in the past, in particular, a device in which both a position for displaying a virtual image and a sensing position are not set in advance, that is, a virtual image in an arbitrary space (free space) instead of a specific place. It seems that no device that realizes display and sensing has been realized.

  The present invention has been made in view of such problems, and a first object of the present invention is to realize obstacle detection with high positional accuracy that can realize virtual display and obstacle detection in the virtual display portion with a simple configuration. It is an object of the present invention to provide a display detection device that can be used. A second object of the present invention is to provide a photodetection device capable of detecting an obstacle with high positional accuracy with a simple configuration.

  A display detection apparatus according to a first aspect of the present invention includes a light source that emits light, an imaging optical system that forms an image of a light emitting part of the light source and displays a virtual light emitting part in free space, and the vicinity of the virtual light emitting part And an optical detector that detects light emitted from the light source and scattered / reflected by the obstacle when an obstacle exists.

  In the display detection apparatus according to the first aspect of the present invention, an image of the light emitting part of the light source is formed by the imaging optical system, and the virtual light emitting unit is displayed in free space. When an obstacle exists in the vicinity of the virtual light emitting unit, the light scattered and reflected by the obstacle is detected by the photodetector. The light source for display and the light source for obstacle detection are shared, and the light for display and the light for detection are emitted from the common light source.

  A display detection apparatus according to a second aspect of the present invention forms an image of a display light source that emits display light, a detection light source that emits obstacle detection light, and a light emitting portion of the display light source. An imaging optical system that displays a virtual light emitting unit in free space and forms an image of the light emitting part of the light source for detection in the vicinity of the virtual light emitting unit in free space, and an obstacle exists in the vicinity of the virtual light emitting unit In some cases, a light detector that detects light emitted from the light source for detection and scattered / reflected by an obstacle is provided.

  In the display detection apparatus according to the second aspect of the present invention, an image of the light emission portion of the display light source is formed by the imaging optical system, the virtual light emission portion is displayed in free space, and the light emission portion of the detection light source. Is formed in the vicinity of the virtual light emitting part in free space. The virtual display light and the detection light are emitted from different light sources, and a common imaging optical system is used for each light source. When an obstacle exists in the vicinity of the virtual light emitting unit, light emitted from the light source for detection and scattered / reflected by the obstacle is detected by the photodetector.

  The light detection device according to the present invention includes a light source that emits light, an imaging optical system that forms an image of the light emitting portion of the light source in free space, and an obstacle in the vicinity of the image of the light emitting portion. And a photodetector for detecting light emitted and scattered / reflected by an obstacle.

  In the photodetecting device according to the present invention, an image of the light emitting portion of the light source is formed in free space by the imaging optical system. When an obstacle exists in the vicinity of the image of the light emitting portion, the light scattered and reflected by the obstacle is detected by the photodetector. Obstacle detection is performed by forming an image of the light-emitting part by the imaging optical system, so only when an obstacle comes near a specific position (image formation position) in free space, it is detected accurately. Is done.

  According to the display detection apparatus according to the first aspect of the present invention, since the light source for virtual display and the light source for obstacle detection are made common, the number is smaller than when separate light sources are used. It can be configured with the number of parts and can be made compact. In addition, since the display light and the detection light are emitted from a common light source, display and detection alignment is easy. Thereby, virtual display and obstacle detection in the virtual display part can be realized with a simple configuration. In addition, since an image of the light emitting part is formed by the imaging optical system and the obstacle is detected, only when an obstacle comes near a specific position (image formation position) in free space. Can be detected with high accuracy. That is, obstacle detection with high position accuracy can be performed.

  According to the display detection apparatus according to the second aspect of the present invention, since the common imaging optical system is used for the display light source and the detection light source, the display light source and the detection light source are separate and independent. Compared to the case of the optical system, the number of parts can be reduced, and the size can be reduced. In addition, since a common imaging optical system is used, alignment between display and detection is easy. Thereby, virtual display and obstacle detection in the virtual display part can be realized with a simple configuration. In addition, since an image of the light emitting part is formed by the imaging optical system and the obstacle is detected, only when an obstacle comes near a specific position (image formation position) in free space. Can be detected with high accuracy. That is, obstacle detection with high position accuracy can be performed.

  According to the light detection device of the present invention, since the obstacle is detected by forming the image of the light emitting portion by the imaging optical system, the obstacle is located near a specific position (image formation position) in free space. Only when it comes, it can be detected accurately. In other words, obstacle detection with high positional accuracy can be performed with a simple configuration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]

  FIG. 1A shows a first configuration example of the display detection apparatus according to the first embodiment of the present invention. This display detection apparatus includes a light emitting light source 1A that emits visible light 10A, and an imaging optical system (projection) such as a condensing lens that forms an image of a light emitting portion of the light emitting light source 1A and displays the virtual light emitting unit 4A in free space. Optical system) 2 and a photodetector 3 that detects light emitted from the light emission source 1A and scattered / reflected by the obstacle 5 when the obstacle 5 exists in the vicinity of the virtual light emitting unit 4A. The light emission source 1A is constituted by a light emitting diode, for example.

  This display detection device first has a function as a space display device that displays a desired point image at a desired place (in free space) in space. In other words, in this display detection device, the visible light 10A from the light emitting light source 1A is condensed at a desired location in the space by the imaging optical system 2, so that the condensing region is punctiform (a point or a certain size). The virtual light emitting unit 4A in the area). Thereby, it can be shown to the observer as if light is emitted from the virtual light emitting unit 4A. This display detection device also has a function as a space detection device. In this display detection device, when an obstacle 5 such as a human finger approaches the virtual light emitting unit 4A displayed in free space, for example, a local region near the virtual light emitting unit 4A in the obstacle 5 A region with extremely large light intensity appears due to light scattering and reflection. By detecting this local increase in luminance by the light detector 3, it is confirmed that the obstacle 5 is very close to the virtual light emitting unit 4A. A simple optical sensor may be used as the photodetector 3, but a two-dimensional sensor such as a CCD (charge coupled device) may be used. In this case, for example, the obstacle 5 can be detected by comparing the surrounding luminance with the luminance from the vicinity of a certain virtual region and detecting that the ratio is equal to or higher than a certain set value by image processing.

FIG. 1B shows a second configuration example of the display detection apparatus according to this embodiment.
This second configuration example is provided with a condensing optical system 6 and an iris (pinhole) 7 in addition to the first configuration example of FIG. The iris 7 is provided with an opening at the center, and blocks light incident on other than the center. The iris 7 is provided in the vicinity of the focal position of the condensing optical system 6. The condensing optical system 6 is provided between the light emitting light source 1 </ b> A and the imaging optical system 2, and condenses the light from the light emitting light source 1 </ b> A near the opening of the iris 7. In the present embodiment, the iris 7 corresponds to a specific example of “light source path limiting means” in the present invention.

  In the second configuration example, by arranging the iris 7, the shape of the virtual light emitting unit 4A can be arranged in a sharper state. That is, a region with high light intensity can be localized in a narrower space. Therefore, it is possible to finely define a region where the light scattering intensity by the obstacle 5 such as a finger is high. Thereby, highly accurate spatial position information is obtained in the photodetector 3.

FIG. 2A shows a third configuration example of the display detection apparatus according to this embodiment.
This third configuration example is provided with an optical filter 8 in addition to the first configuration example of FIG. The optical filter 8 is disposed between the imaging optical system 2 and the virtual light emitting unit 4A. This third configuration example is one method for making the viewer feel as if light is emitted from the virtual light emitting unit 4A more effectively. In the first configuration example of FIG. 1A, the light emitting light source 1 and the imaging optical system 2 are illuminated by the stray light out of the light emitted from the light emitting light source 1, and the reflected scattered light is observed by the observer. May be observed. In this case, the reflected scattered light is observed to overlap with the image of the virtual light emitting unit 4A, and the observer sees the image of the virtual light emitting unit 4A in association with the stray light. Thereby, the display effect as virtual light emission part 4A may be reduced. In the third configuration example, the optical filter 8 is arranged to prevent the display effect from being reduced by stray light and to hide the optical parts such as the light emission source 1 and the imaging optical system 2 from the observer.

FIG. 2B shows a fourth configuration example of the display detection apparatus according to this embodiment.
The fourth configuration example further includes an optical filter 9 arranged on the light incident side of the photodetector 3 with respect to the first configuration example of FIG. The optical filter 9 is a filter that passes only light having the wavelength of the light from the light emitting light source 1. By disposing such an optical filter 9 on the light incident side of the light detector 3, unnecessary light that becomes noise can be prevented from entering the light detector 3, and the detection sensitivity can be increased.

  In the present embodiment, the light emission source 1A is not limited to a single light emission source, and there may be a plurality of light emission sources. For example, the light emission source 1A may be configured by a display device such as a liquid crystal display. By doing so, an image such as a liquid crystal display is virtually displayed on the free space as the virtual light emitting unit 4A. By using a liquid crystal display or the like, various shapes can be selected as the virtual light emitting unit 4A.

  According to the display detection apparatus according to the present embodiment, if a light emitting point (virtual light emitting point) is arranged in an empty space and an observer of the light emitting point touches it with a finger or the like, for example, It can be detected. Furthermore, what can be arranged in the space is not limited to the light emitting point, and a desired image or the like can be arranged, and this can be detected by touching the image (virtual image) arranged in the space with a finger or the like. . In addition, according to the display detection device according to the present embodiment, using the above-described effect, for example, by starting an operation of a home appliance or the like by touching a virtual image that is not a real object arranged in free space. -It can also be operated as a switch for stopping. In addition to the switch operation, it is possible to provide a television channel function by selecting an image arranged in a space, and to function as an interface between a home appliance and a person. In this case, the switches and channels placed in the space are virtual images that do not exist. Therefore, unlike actual devices, there is no need to worry about being injured or causing them to disappear. Can be realized.

In addition, according to the display detection apparatus according to the present embodiment, since the light source for virtual display and the light source for obstacle detection are made common, there are fewer parts than when separate light sources are used. It can be configured with a number of points and can be made compact. Further, since the light for display and the light for detection are emitted from the common light source 1, the alignment between display and detection is easy. Thereby, virtual display and obstacle detection in the virtual display part can be realized with a simple configuration. In addition, since the imaging optical system 2 forms an image of the light-emitting portion and performs obstacle detection, only when the obstacle 5 comes near a specific position (image formation position) in free space. It can be detected with high accuracy. That is, obstacle detection with high position accuracy can be performed.
[Second Embodiment]

  Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the first embodiment (FIGS. 1A and 1B and FIGS. 2A and 2B), the visible light 10A is used as the light emission source 1A, and the virtual light emitting unit 4A that can be visually recognized by an observer. However, the present embodiment relates to a light detection apparatus that performs only obstacle detection without performing virtual display.

FIG. 3A illustrates a first configuration example of the light detection device according to this embodiment.
This configuration example includes a light emission source 1B that emits invisible light (infrared light or the like) 10B instead of the light emission source 1A in the configuration example of FIG. In this configuration example, the imaging optical system 2 forms an image 4B of the light emitting portion of the light emitting light source 1B on a free space. The light detector 3 detects the light emitted from the light emitting light source 1B and scattered / reflected by the obstacle 5 when the obstacle 5 exists in the vicinity of the image 4B of the light emitting portion.

FIG. 3B illustrates a second configuration example of the light detection device according to this embodiment.
This configuration example includes a light emission source 1B that emits invisible light 10B similar to that in FIG. 3A, instead of the light emission source 1A in the configuration example of FIG.

FIG. 3C illustrates a third configuration example of the light detection device according to this embodiment.
This configuration example includes a light emission source 1B that emits invisible light 10B similar to that in FIG. 3A, instead of the light emission source 1A in the configuration example of FIG.

  In the first embodiment, the virtual light emitting unit 4A is displayed, but there may be a case where it is desired to know that the obstacle 5 has come near the virtual light emitting point in a state where the virtual light emitting point is not visible. It is done. For example, an invisible virtual light emitting point is arranged at the focal position of the photographing camera, and an apparatus that detects and photographs only when an object such as an animal comes to the place can be considered. The photodetection device according to the present embodiment can cope with such a usage pattern. Even if the invisible light 10B is used, the configuration examples of FIGS. 3A and 3B and FIG. 3C in the present embodiment are the same as those in FIGS. 1A and 1B in the first embodiment, respectively. B) When the obstacle 5 is present in the vicinity of the image 4B of the light emitting portion by the invisible light 10B, it can be detected in the same manner as in the configuration example of FIG. 2B.

As described above, according to the photodetector according to the present embodiment, the obstacle 4 is detected by forming the image 4B of the light emitting portion by the imaging optical system 2, and thus the first embodiment described above. Similar to the embodiment, only when the obstacle 5 comes near a specific position (image formation position) in free space, it can be detected with high accuracy. In other words, obstacle detection with high positional accuracy can be performed with a simple configuration.
[Third Embodiment]

  Next, a third embodiment of the present invention will be described. Note that components that are substantially the same as those in the first and second embodiments are given the same reference numerals, and descriptions thereof are omitted as appropriate.

FIG. 4A shows a first configuration example of the display detection apparatus according to this embodiment.
This configuration example is a combination of the configuration of FIG. 1A in the first embodiment and the configuration of FIG. 3A in the second embodiment. That is, in the configuration example of FIG. 4A, a light emitting source 1A that emits visible light 10A and a light emitting source 1B that emits invisible light 10B are provided as light sources. The light emitting light source 1A and the light emitting light source 1B are arranged close to each other. In the present embodiment, the imaging optical system 2 forms an image of the light emitting part of the light emitting light source 1A, displays the virtual light emitting part 4A in free space, and freely displays the image 4B of the light emitting part of the light emitting light source 1B. It is formed in the vicinity of the virtual light emitting unit 4A in space. The light detector 3 detects the light emitted from the light emitting light source 1B and scattered / reflected by the obstacle 5 when the obstacle 5 exists in the vicinity of the image 4B of the light emitting portion (that is, in the vicinity of the virtual light emitting unit 4A). .
In the present embodiment, the light emission source 1A that emits visible light 10A corresponds to a specific example of “display light source” in the present invention, and the light emission light source 1B that emits invisible light 10B is a specific example of “detection light source”. Corresponding to

  In the present embodiment, the virtual light emitting unit 4A using the visible light 10A of the light emitting light source 1A serves as a mark for the observer. On the other hand, the image 4B of the light emission part by the invisible light 10B of the light emission light source 1B has a role of obstacle detection. In the configuration example of FIG. 4A, the light emission source 1A and the light emission source 1B are each a single light emission source. However, the light emission source 1A and the light emission source 1B are not limited to a single light emission source. There may be more than one. For example, the light emission source 1A that is a display light source may be configured by a display device such as a liquid crystal display. And you may be the structure which embedded the light emission light source 1B which is a light source for detection in it. By doing so, an image such as a liquid crystal display is virtually displayed on the free space as the virtual light emitting unit 4A. By using a liquid crystal display or the like, various shapes can be selected as the virtual light emitting unit 4A.

FIG. 4B shows a second configuration example of the display detection apparatus according to this embodiment.
The light emission source 1A that emits visible light 10A does not have to be self-luminous, and may be a normal object (reflection / scattering body) that scatters light irradiated by an illumination lamp. In the second configuration example of FIG. 4 (B), instead of the light emission source 1A in FIG. 4 (A), an illumination lamp 11 that emits visible light 10A, and the visible light 10A that is illuminated by the illumination lamp 11 is reflected / reflected. A reflection / scattering body 12 for scattering is provided. The light emitting light source 1 </ b> B that is a light source for detection is disposed in the vicinity of the reflector / scatterer 12. In the second configuration example, the optical filter 9 similar to the configuration example of FIG. 2B in the first embodiment is provided on the light incident side of the photodetector 3. In this configuration example, the imaging optical system 2 forms an image of the reflecting / scattering body 12 as a light emitting portion instead of the light emitting light source 1A and displays the virtual light emitting unit 4A in free space. By using the reflecting / scattering body 12 as a light emitting portion, it is possible to dispose the virtual light emitting portion 4A in the free space even if the configuration is difficult for a normal light emitting element.

FIG. 4C shows a third configuration example of the display detection apparatus according to this embodiment.
In the second configuration example of FIG. 4B, the light emission source 1B, which is a light source for detection, and the reflection / scattering body 12 are arranged close to each other. However, in the third configuration example of FIG. A reflection / scattering body iris (pinhole) 7A that is disposed apart from the light source 1B and is reflected by the illumination lamp 11 to reflect / scatter the visible light 10A is provided. The reflection / scattering body iris 7A is provided with an opening at the center, and shields the invisible light 10B from the light emitting light source 1B incident on the area other than the center. A condensing optical system 6 is provided between the reflecting / scattering body iris 7A and the light emitting light source 1B, and condenses light from the light emitting light source 1B near the opening of the reflecting / scattering body iris 7A. In the present embodiment, the iris 7A corresponds to a specific example of “light source optical path limiting means” in the present invention.

  In this third configuration example, the imaging optical system 2 forms an image of the reflecting / scattering body iris 7A as a light emitting portion instead of the light emitting light source 1A, and has an opening in the free space. The virtual light emitting unit 4C is displayed. On the other hand, the invisible light 10B from the light emitting light source 1B, which is a light source for detection, is once condensed near the opening of the reflecting / scattering body iris 7A by the condensing optical system 6. Thereafter, an image is formed by the imaging optical system 2 in the vicinity of the opening at the center of the virtual light emitting unit 4C. Thereby, the image 4B of the light emission part of the light emission source 1B is arranged at the center of the virtual light emission part 4C visible to the observer, and this is an area for detecting an obstacle. In the configuration example of FIG. 4C, the iris is configured by a reflector / scatterer. However, as described in the description of the configuration example of FIG. 4A, the iris is configured by, for example, a liquid crystal display or an LED. It doesn't matter.

  As described above, according to the display detection apparatus according to the present embodiment, since the image 4B of the light emitting part for detecting the obstacle is formed in the vicinity of the virtual light emitting unit 4A, the first embodiment described above. Similarly to the above, for example, by touching a virtual image that is not a real thing arranged in free space, it can be operated as a switch for starting / stopping home appliances and the like. In addition to the switch operation, it is possible to provide a television channel function by selecting an image arranged in a space, and to function as an interface between a home appliance and a person. In this case, the switches and channels placed in the space are virtual images that do not exist. Therefore, unlike actual devices, there is no need to worry about being injured or causing them to disappear. Can be realized.

Moreover, according to the display detection apparatus according to the present embodiment, the common imaging optical system 2 is used for the display light source (light emission light source 1A) and the detection light source (light emission light source 1B). Compared to the case where the light source and the light source for detection are separate and independent optical systems, the number of parts can be reduced, and the size can be reduced. In addition, since the common imaging optical system 2 is used, alignment between display and detection is easy. Thereby, virtual display and obstacle detection in the virtual display part can be realized with a simple configuration. Further, since the image formation system 4B is formed by the imaging optical system 2 to detect the obstacle, when the obstacle 5 comes near a specific position (image formation position) in free space. Only it can be detected accurately. That is, obstacle detection with high position accuracy can be performed.
[Fourth Embodiment]

  Next, a fourth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the present embodiment, with respect to the display detection apparatus according to the first embodiment, the positions of the light emitting portion of the light emitting light source 1A and the photodetector 3 are arranged substantially confocal with each other, so-called “confocal optics”. System ".

FIG. 5A shows a first configuration example of the display detection apparatus according to this embodiment.
In this configuration example, the photodetector 3 is arranged in the vicinity of the light emission source 1A with respect to the configuration example of FIG. In this configuration example, when the obstacle 5 exists in the vicinity of the virtual light emitting unit 4A, the light emitted from the light source 1A and scattered / reflected by the obstacle 5 is detected by the photodetector 3 via the imaging optical system 2. Is detected. In the confocal optical system, the light scattered by the obstacle 5 is focused in the vicinity of the light emitting point only when the obstacle 5 is at the position where the light emitting point (the light emitting portion of the light emitting light source 1A) is focused. Only the light intensity in the vicinity of the light emitting point is greatly increased. For this reason, as shown in FIG. 5A, an obstacle 5 is located near the virtual light emitting unit 4A by disposing the photodetector 3 near the light emitting light source 1A and observing the light intensity near the light emitting point. I can know if.

FIG. 5B shows a second configuration example of the display detection apparatus according to this embodiment.
In this configuration example, the photodetector 3 is arranged in the vicinity of the light emitting light source 1A as in the configuration example in FIG. 5A, and the condensing optical system 6 and the iris 7 are the same as those in the configuration example in FIG. Are arranged. The effect of arranging the iris 7 is the same as that of the configuration example of FIG.

FIG. 6A shows a third configuration example of the display detection apparatus according to this embodiment.
This configuration example includes a photodetector 3A having a shape surrounding the periphery of the light emitting light source 1A. By providing the photodetector 3A having such a shape, the light scattered and reflected by the obstacle 5 and returned to the vicinity of the light emission source 1A can be efficiently detected.

FIG. 6B shows a fourth configuration example of the display detection apparatus according to this embodiment.
This configuration example includes the iris 7 as in the configuration example of FIG. 5B, but light having a shape surrounding the opening of the iris 7 with respect to the configuration example of FIG. 5B. A detector 3A is provided. In this configuration example, a virtual light emitting point localized as the virtual light emitting unit 4 </ b> A can be formed by the iris 7, and light scattered and reflected by the obstacle 5 and returned to the vicinity of the opening of the iris 7 can be efficiently detected.

Other operations and effects of the display detection apparatus according to the present embodiment are the same as those of the first embodiment.
[Fifth Embodiment]

  Next, a fifth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

As in the second embodiment, the present embodiment relates to a light detection apparatus that includes a light emission source 1B that emits invisible light (infrared light or the like) 10B, and that performs only obstacle detection without performing virtual display. FIGS. 7A and 7B and FIGS. 8A and 8B show first to fourth configuration examples of the photodetecting device according to the present embodiment, respectively. This is an example in which the configuration example described in FIGS. 5A and 5B and FIGS. 6A and 6B in the embodiment is configured by an optical system using invisible light 10B. The utility of the optical system using the invisible light 10B is the same as that of the second embodiment.
[Sixth Embodiment]

  Next, a sixth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the present embodiment, by combining the fourth embodiment and the fifth embodiment, the visible light 10A and the invisible light 10B are used in combination as in the third embodiment. It is a thing. The usefulness of using the visible light 10A and the invisible light 10B together is the same as in the third embodiment.

FIG. 9A shows a first configuration example of the display detection apparatus according to this embodiment.
This configuration example is a combination of the configuration of FIG. 5A in the third embodiment and the configuration of FIG. 7A in the fourth embodiment. That is, the configuration example of FIG. 9A includes a light emission source 1A that emits visible light 10A and a light emission source 1B that emits invisible light 10B as light sources. The light emitting light source 1A and the light emitting light source 1B are arranged close to each other. The photodetector 3 is arranged in the vicinity of the light emitting light source 1B as in the configuration example of FIG. Thereby, the light emission part of the light emission light source 1B and the photodetector 3 form a substantially confocal optical system. In the present embodiment, the imaging optical system 2 forms an image of the light emitting part of the light emitting light source 1A, displays the virtual light emitting part 4A in free space, and freely displays the image 4B of the light emitting part of the light emitting light source 1B. It is formed in the vicinity of the virtual light emitting unit 4A in space. When the obstacle 5 exists in the vicinity of the image 4B of the light emitting part (that is, in the vicinity of the virtual light emitting unit 4A), the light emitted from the light emitting light source 1B and scattered / reflected by the obstacle 5 passes through the imaging optical system 2. And is detected by the photodetector 3.
In the present embodiment, the light emission source 1A that emits visible light 10A corresponds to a specific example of “display light source” in the present invention, and the light emission light source 1B that emits invisible light 10B is a specific example of “detection light source”. Corresponding to

  FIG. 9B shows a second configuration example of the display detection apparatus according to this embodiment. This configuration example is a configuration form in which the configuration of FIG. 5B in the third embodiment is combined with the configuration of FIG. 7B in the fourth embodiment.

  FIG. 10A shows a third configuration example of the display detection apparatus according to this embodiment. This configuration example is a combination of the configuration of FIG. 6A in the third embodiment and the configuration of FIG. 8A in the fourth embodiment. In this configuration example, the photodetector 3A is provided so as to surround the light emitting light source 1A and the light emitting light source 1B.

FIG. 10B shows a fourth configuration example of the display detection apparatus according to this embodiment. This configuration example is a configuration form combining the configuration of FIG. 6B in the third embodiment and the configuration of FIG. 8B in the fourth embodiment.
[Seventh Embodiment]

  Next, a seventh embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the present embodiment, as in the fourth embodiment, the light emitting portion of the light emission source 1A and the photodetector 3 are arranged so as to form a substantially confocal optical system.

FIG. 11A shows a first configuration example of the display detection apparatus according to this embodiment.
In the configuration example of FIG. 5A of the fourth embodiment, the photodetector 3 is arranged in the vicinity of the light emitting portion of the light emission source 1A to form a substantially confocal optical system. 11A includes a beam splitter 13 that reflects the light scattered and reflected by the obstacle 5 and returning to the imaging optical system 2 side in a direction different from that of the light emission source 1A. Are provided in the direction of light reflection by the beam splitter 13.
In the present embodiment, the beam splitter 13 corresponds to a specific example of “reflection optical member” in the present invention.

  In the configuration example of FIG. 11A, the photodetector 3 is provided at a position where the optical path length from the beam splitter 13 is substantially the same as the optical path length from the light emitting light source 1A to the beam splitter 13. Thereby, the light emission source 1A and the photodetector 3 are divided into separate confocal optical systems and arranged independently. By doing so, the photodetector 3 can be accurately arranged at the confocal position of the virtual light emitting unit 4A. In the confocal optical system in the configuration example of FIG. 5A of the fourth embodiment, the light scattered and reflected by the obstacle 5 is collected at the position of the light emitting light source 1A. Therefore, the light intensity becomes the strongest at the position of the light emitting light source 1A. Ideally, the photodetector 3 is desirably disposed at that position. However, it is difficult to arrange the light emitting light source 1A and the photodetector 3 so as to completely overlap with each other. In the configuration example of FIG. 11A, the light scattered and reflected by the obstacle 5 is reflected by the beam splitter 13 to create another point of confocal position. Since there is no light emitting light source 1A at the newly formed confocal position, the photodetector 3 can be accurately arranged at the position where the light intensity is the strongest. This makes it possible to accurately detect that the obstacle 5 has come to a position near the virtual light emitting unit 4A.

FIG. 11B shows a second configuration example of the display detection apparatus according to this embodiment.
In the configuration example of FIG. 11B, a beam splitter 13 similar to the configuration example of FIG. 11A is provided for the configuration example of FIG. 5B of the fourth embodiment. . In the configuration example of FIG. 11B, the photodetector 3 is provided at a position where the optical path length from the beam splitter 13 is substantially the same as the optical path length from the iris 7 to the beam splitter 13. Thereby, since the intermediate image of the light emission part of the light emission light source 1A is formed by the condensing optical system 6 in the opening part of the iris 7, the intermediate image of the light emission part formed in the opening part of the iris 7 is used as the light emission light source 1A. Therefore, it can be considered that the light emission source 1A and the light detector 3 are divided into separate confocal optical systems and arranged independently.

Another advantage of separating the confocal optical system by the beam splitter 13 as shown in FIGS. 11A and 11B is that the two confocal optical systems can be designed relatively independently. For example, as shown in the third configuration example in FIG. 12, a condensing optical system 14 such as a lens is disposed in front of the photodetector 3. Thereby, the freedom degree which chooses the position which arrange | positions the photodetector 3 can be raised by changing the focal distance of the condensing optical system 14 suitably.
[Eighth Embodiment]

  Next, an eighth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

As in the second embodiment, the present embodiment relates to a light detection apparatus that includes a light emission source 1B that emits invisible light (infrared light or the like) 10B, and that performs only obstacle detection without performing virtual display. FIGS. 13A and 13B show first and second configuration examples of the photodetecting device according to the present embodiment. FIGS. 11A and 11B in the seventh embodiment, respectively. This is an example in which the configuration example described in (B) is configured with an optical system using invisible light 10B. The utility of the optical system using the invisible light 10B is the same as that of the second embodiment.
[Ninth Embodiment]

  Next, a ninth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the present embodiment, by combining the seventh embodiment and the eighth embodiment, the visible light 10A and the invisible light 10B are used in combination as in the third embodiment. It is a thing. The usefulness of using the visible light 10A and the invisible light 10B together is the same as in the third embodiment.

FIG. 14A shows a first configuration example of the display detection apparatus according to this embodiment.
This configuration example is a configuration form in which the configuration of FIG. 11A in the seventh embodiment and the configuration of FIG. 13A in the eighth embodiment are combined. That is, the configuration example of FIG. 14A includes a light emission source 1A that emits visible light 10A and a light emission source 1B that emits invisible light 10B as light sources. The light emitting light source 1A and the light emitting light source 1B are arranged close to each other. As in the configuration example of FIG. 13A, the photodetector 3 is provided at a position where the optical path length from the beam splitter 13 is substantially the same as the optical path length from the light emission source 1B to the beam splitter 13. Thereby, the light emission part of the light emission light source 1B and the photodetector 3 form a substantially confocal optical system. In the present embodiment, the imaging optical system 2 forms an image of the light emitting part of the light emitting light source 1A, displays the virtual light emitting part 4A in free space, and freely displays the image 4B of the light emitting part of the light emitting light source 1B. It is formed in the vicinity of the virtual light emitting unit 4A in space. When the obstacle 5 exists in the vicinity of the image 4B of the light emitting part (that is, in the vicinity of the virtual light emitting unit 4A), the light emitted from the light emitting light source 1B and scattered / reflected by the obstacle 5 is reflected by the imaging optical system 2 and The light is detected by the photodetector 3 through the beam splitter 13.
In the present embodiment, the light emission source 1A that emits visible light 10A corresponds to a specific example of “display light source” in the present invention, and the light emission light source 1B that emits invisible light 10B is a specific example of “detection light source”. Corresponding to

FIG. 14B illustrates a second configuration example of the display detection apparatus according to the present embodiment. This configuration example is a configuration in which the configuration of FIG. 11B in the seventh embodiment is combined with the configuration of FIG. 13B in the eighth embodiment. In the configuration example of FIG. 14B, a light emission source 1 </ b> A that emits visible light 10 </ b> A is disposed in the vicinity of the opening of the iris 7. The arrangement of the optical elements that guide the invisible light 10B is the same as that in FIG. In the configuration example of FIG. 14B, the photodetector 3 is provided at a position where the optical path length from the beam splitter 13 is substantially the same as the optical path length from the iris 7 to the beam splitter 13. Thereby, since the intermediate image of the light emission part of the light emission light source 1B is formed by the condensing optical system 6 in the opening part of the iris 7, the intermediate image of the light emission part formed in the opening part of the iris 7 is used as the light emission light source. By considering it as 1B, it can be considered that the light emitting light source 1B emitting the invisible light 10B and the photodetector 3 are divided into separate confocal optical systems and arranged independently.
[Tenth embodiment]

  Next, a tenth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as the said 1st Embodiment, and description is abbreviate | omitted suitably.

FIG. 15A shows a first configuration example of the display detection apparatus according to this embodiment.
The configuration example of FIG. 15A further includes a pinhole 15 between the beam splitter 13 and the photodetector 3 in addition to the configuration example of FIG. 11A of the seventh embodiment. It is. The pinhole 15 is provided with an opening at the center, and shields the visible light 10 </ b> A that has entered the area other than the center.
In the present embodiment, the pinhole 15 corresponds to a specific example of “detection optical path limiting means” in the present invention.

  In the configuration example of FIG. 11A, it is desirable that the light receiving area of the photodetector 3 is equivalent to the spot area where the return light is collected. However, in that case, since only a minute region is received, dirt and defects on the light receiving surface must be highly controlled. There is also a problem that the light receiving area cannot be easily changed. The configuration example in FIG. 15A solves this problem. In the configuration example of FIG. 15A, the opening of the pinhole 15 instead of the photodetector 3 is arranged at the confocal position of the virtual light emitting unit 4A. That is, the pinhole 15 is provided between the beam splitter 13 and the photodetector 3 at a position where the optical path length from the beam splitter 13 is substantially the same as the optical path length to the light emitting light source 1 </ b> A and the beam splitter 13.

FIG. 15B shows a second configuration example of the display detection apparatus according to this embodiment.
The configuration example in FIG. 15B further includes a pinhole 15 between the beam splitter 13 and the photodetector 3 in addition to the configuration example in FIG. 11B of the seventh embodiment. It is. The effect by providing the pinhole 15 is the same as that of the structural example of FIG. In the configuration example of FIG. 15B, the optical path length from the beam splitter 13 to the opening of the pinhole 15 is arranged to be substantially the same as the optical path length from the opening of the iris 7 to the beam splitter 13. .

After the light passes through the pinhole 15, the diameter of the light beam on the light receiving surface of the photodetector 3 is set to a desired beam by arranging the condenser lens 16 as shown in a configuration example of FIG. You may adjust so that it may become a diameter.
[Eleventh embodiment]

  Next, an eleventh embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

As in the second embodiment, the present embodiment relates to a light detection apparatus that includes a light emission source 1B that emits invisible light (infrared light or the like) 10B, and that performs only obstacle detection without performing virtual display. FIGS. 16A and 16B show first and second configuration examples of the photodetector according to the present embodiment, respectively, and FIGS. 15A and 15B in the tenth embodiment, respectively. This is an example in which the configuration example described in (B) is configured with an optical system using invisible light 10B. The utility of the optical system using the invisible light 10B is the same as that of the second embodiment.
[Twelfth embodiment]

  Next, a twelfth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  In the present embodiment, by combining the tenth embodiment and the eleventh embodiment, the visible light 10A and the invisible light 10B are used in combination as in the third embodiment. It is a thing. The usefulness of using the visible light 10A and the invisible light 10B together is the same as in the third embodiment.

FIG. 17A shows a first configuration example of the display detection apparatus according to this embodiment.
This configuration example is a configuration form combining the configuration of FIG. 15A in the tenth embodiment and the configuration of FIG. 16A in the eleventh embodiment. That is, in the configuration example of FIG. 17A, a light emitting source 1A that emits visible light 10A and a light emitting source 1B that emits invisible light 10B are provided as light sources. The light emitting light source 1A and the light emitting light source 1B are arranged close to each other. As in the configuration example of FIG. 16A, the pinhole 15 has an optical path length from the beam splitter 13 between the beam splitter 13 and the photodetector 3 such that the optical path length to the light emitting light source 1B and the beam splitter 13 is the same. They are provided at substantially the same position. Thereby, the light emission part of the light emission source 1B and the opening part of the pinhole 15 mutually form a substantially confocal optical system. In the present embodiment, the imaging optical system 2 forms an image of the light emitting part of the light emitting light source 1A, displays the virtual light emitting part 4A in free space, and freely displays the image 4B of the light emitting part of the light emitting light source 1B. It is formed in the vicinity of the virtual light emitting unit 4A in space. When the obstacle 5 exists in the vicinity of the image 4B of the light emitting part (that is, in the vicinity of the virtual light emitting unit 4A), the light emitted from the light emitting light source 1B and scattered / reflected by the obstacle 5 is converted into the imaging optical system 2, The light is detected by the photodetector 3 through the beam splitter 13 and the pinhole 15.
In the present embodiment, the light emission source 1A that emits visible light 10A corresponds to a specific example of “display light source” in the present invention, and the light emission light source 1B that emits invisible light 10B is a specific example of “detection light source”. Corresponding to

FIG. 17B illustrates a second configuration example of the display detection apparatus according to the present embodiment. This configuration example is a combination of the configuration of FIG. 15B in the tenth embodiment and the configuration of FIG. 16B in the eleventh embodiment. In the configuration example of FIG. 17B, a light emission source 1 </ b> A that emits visible light 10 </ b> A is disposed in the vicinity of the opening of the iris 7. The arrangement of the optical elements that guide the invisible light 10B is the same as that in FIG. In the configuration example of FIG. 17B, the optical path length from the beam splitter 13 to the opening of the pinhole 15 is arranged to be substantially the same as the optical path length from the opening of the iris 7 to the beam splitter 13. . Thereby, since the intermediate image of the light emission part of the light emission light source 1B is formed by the condensing optical system 6 in the opening part of the iris 7, the intermediate image of the light emission part formed in the opening part of the iris 7 is used as the light emission light source. By considering it as 1B, it can be considered that the light emitting source 1B emitting invisible light 10B and the opening of the pinhole 15 are divided into separate confocal optical systems and arranged independently.
[Thirteenth embodiment]

  Next, a thirteenth embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component substantially the same as previous embodiment, and description is abbreviate | omitted suitably.

  FIG. 18 shows the configuration of the display detection apparatus according to the present embodiment. In this display detection device, a condensing lens 16 and an optical filter 8 are further arranged with respect to the configuration example of FIG. 15A of the tenth embodiment. The optical filter 8 is disposed between the imaging optical system 2 and the virtual light emitting unit 4A. The operations and effects of providing the optical filter 8 are the same as those in the configuration example of FIG. 2A of the first embodiment. The condenser lens 16 is provided between the photodetector 3 and the pinhole 15. Providing the condensing lens 16 makes it easy to adjust the diameter of the light beam on the light receiving surface of the photodetector 3 so as to have a desired beam diameter.

  FIG. 19A shows a result of an experiment to determine what kind of detection signal is actually obtained using the display detection apparatus according to the present embodiment. In the configuration of FIG. 18, as shown in FIG. 19 (B), the position of the finger as the obstacle 5 with respect to the virtual light emitting unit 4A is continuous as point A → B point → C point → B point → A point. Moved. FIG. 19A shows the change in the amount of light observed by the photodetector 3 in this case. In FIG. 19A, the vertical axis indicates the amount of light and the horizontal axis indicates time. As can be seen from FIG. 19A, the amount of light returning to the photodetector 3 increases only when the position of the finger is at the position (point B) of the virtual light emitting unit 4A. That is, it is possible to accurately know the presence or absence of the obstacle 5 in the vicinity of the virtual light emitting unit 4A. Similar detection results can be obtained for the detection devices of the first to twelfth embodiments.

In addition, this invention is not limited to said each embodiment, A various deformation | transformation implementation is possible.
For example, the number of the light emitting unit images 4B (for example, FIG. 16A) for obstacle detection is not limited to one, and a plurality of images may be arranged as necessary. For example, a desired number of devices shown in FIG. 16A may be arranged, or a desired number of obstacle detection light sources (light emitting light source 1B) and a desired number of obstacle detection light sources in the device shown in FIG. A corresponding number of photodetectors 3 may be arranged.

It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 1st Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 3rd structural example (A) and 4th structural example (B) of the display detection apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the 1st structural example (A), the 2nd structural example (B), and the 3rd structural example (C) of the photodetector which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the 1st structural example (A), the 2nd structural example (B), and the 3rd structural example (C) of the display detection apparatus which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 4th Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 3rd structural example (A) of the display detection apparatus which concerns on the 4th Embodiment of this invention, and a 4th structural example (B). It is a block diagram which shows the 1st structural example (A) and 2nd structural example (B) of the photodetector which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the 3rd structural example (A) and 4th structural example (B) of the photodetector which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 6th Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 3rd structural example (A) and the 4th structural example (B) of the display detection apparatus which concerns on the 6th Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 7th Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 3rd structural example of the display detection apparatus which concerns on the 7th Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) and 2nd structural example (B) of the photodetector which concerns on the 8th Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 9th Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 1st structural example (A) of the display detection apparatus which concerns on the 10th Embodiment of this invention, and the 2nd structural example (B). It is a block diagram which shows the 1st structural example (A) and 2nd structural example (B) of the photodetector which concerns on the 11th Embodiment of this invention. It is a block diagram which shows the 1st structural example (A) and the 2nd structural example (B) of the display detection apparatus which concerns on the 12th Embodiment of this invention. It is a block diagram which shows the display detection apparatus based on the 13th Embodiment of this invention. It is a figure which shows an example (A) of a detection signal detected by the display detection apparatus concerning the 13th Embodiment of this invention, and the operation | movement (B) of the finger | toe at the time of detection. It is a block diagram which shows an example of the conventional display detection apparatus. It is a whole block diagram which shows the other example of the conventional display detection apparatus. It is an internal block diagram which shows the other example of the conventional display detection apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A ... Light emission light source (light source for display), 1B ... Light emission light source (light source for detection), 2 ... Imaging optical system, 3, 3A ... Photo detector, 4A ... Virtual light emission part, 4B ... Image of light emission part, 6 ... Condensing optical system, 7 ... Iris (light path limiting means for light source), 7A ... Reflector / scattering body iris, 8, 9 ... Optical filter, 10A ... Visible light, 10B ... Invisible light, 11 ... Illuminating lamp, 12 ... Reflection / Scattering body, 13 ... beam splitter (reflection optical member), 14 ... condensing optical system, 15 ... pinhole (detection optical path limiting means).

Claims (33)

A light source that emits light;
An imaging optical system for forming an image of a light emitting part of the light source and displaying a virtual light emitting part in free space;
And a photodetector that detects light emitted from the light source and scattered / reflected by the obstacle when an obstacle is present in the vicinity of the virtual light emitting unit. The display detection device according to claim 1, further comprising: an optical filter disposed between the imaging optical system and the virtual light emitting unit. The display detection apparatus according to claim 1, further comprising: an optical filter disposed on a light incident side of the photodetector. The display detection according to claim 1, wherein the photodetector is disposed in the vicinity of the light source, and detects light scattered and reflected by the obstacle through the imaging optical system. apparatus. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
The display detection apparatus according to claim 1, wherein the photodetector is provided in a direction in which light is reflected by the reflective optical member. The display according to claim 5, wherein the optical detector is provided at a position where an optical path length from the reflective optical member is substantially the same as an optical path length from the light source to the reflective optical member. Detection device. Optical path limiting means for detection provided between the reflective optical member and the photodetector at a position where the optical path length from the reflective optical member is substantially the same as the optical path length from the light source to the reflective optical member. The display detection apparatus according to claim 5, further comprising: A condensing optical system that is provided between the light source and the imaging optical system and condenses light from the light source;
The display detection apparatus according to claim 1, further comprising: an optical path limiting unit for a light source provided in the vicinity of a focal position of the condensing optical system. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
The photodetector is provided in the direction of light reflection by the reflective optical member, and the optical path length from the reflective optical member is substantially the same as the optical path length from the light source optical path limiting means to the reflective optical member. The display detection apparatus according to claim 8, wherein the display detection apparatus is provided at a position. A reflective optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
A detection optical path limiting means provided between the reflective optical member and the photodetector;
The photodetector is provided in the direction of light reflection by the reflective optical member,
The detection optical path limiting means is provided at a position where an optical path length from the reflective optical member is substantially the same as an optical path length from the light source optical path limiting means to the reflective optical member. Item 9. The display detection device according to Item 8. The display detection apparatus according to claim 8, wherein the photodetector is provided in the vicinity of a light source optical path limiting unit. A display light source that emits display light;
A light source for detection that emits light for detecting obstacles;
An image of a light emitting part of the display light source is formed to display a virtual light emitting part in free space, and an image of the light emitting part of the detection light source is formed in the vicinity of the virtual light emitting part in free space. An image optical system;
And a photodetector for detecting light emitted from the detection light source and scattered / reflected by the obstacle when an obstacle is present near the virtual light emitting unit. The display detection device according to claim 12, further comprising: an optical filter disposed on a light incident side of the photodetector. The light emitted from the display light source is visible light,
The display detection apparatus according to claim 12, wherein the light emitted from the detection light source is invisible light. The display detection apparatus according to claim 12, wherein the light emitted from the light source for detection is infrared light. The said photodetector is arrange | positioned in the vicinity of the said light source for a detection, and detects the light scattered and reflected by the said obstacle through the said imaging optical system. Display detection device. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source for detection;
The display detection apparatus according to claim 12, wherein the photodetector is provided in a direction in which light is reflected by the reflective optical member. The optical detector further includes: an optical path length from the reflective optical member provided at a position where the optical path length from the detection light source to the reflective optical member is substantially the same. Item 18. The display detection device according to Item 17. An optical path for detection provided between the reflective optical member and the photodetector at a position where the optical path length from the reflective optical member is substantially the same as the optical path length from the light source for detection to the reflective optical member. The display detection apparatus according to claim 17, further comprising a limiting unit. It is provided between at least one of the display light source and the imaging optical system, or between the detection light source and the imaging optical system, and collects light from the display light source or the detection light source. A condensing optical system,
The display detection apparatus according to claim 12, further comprising: an optical path limiting unit for a light source provided in the vicinity of a focal position of the condensing optical system. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source for detection;
The condensing optical system and the light source optical path limiting means are provided between the detection light source and the imaging optical system;
The photodetector is provided in the direction of light reflection by the reflective optical member, and the optical path length from the reflective optical member is substantially the same as the optical path length from the light source optical path limiting means to the reflective optical member. The display detection apparatus according to claim 20, wherein the display detection apparatus is provided at a position. A reflective optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system side in a direction different from the light source for detection;
A detection optical path limiting means provided between the reflective optical member and the photodetector;
The condensing optical system and the light source optical path limiting means are provided between the detection light source and the imaging optical system;
The photodetector is provided in the direction of light reflection by the reflective optical member,
The detection optical path limiting means is provided at a position where an optical path length from the reflective optical member is substantially the same as an optical path length from the light source optical path limiting means to the reflective optical member. Item 20. The display detection device according to Item 20. A light source that emits light;
An imaging optical system for forming an image of a light emitting portion of the light source on a free space;
And a photodetector that detects light emitted from the light source and scattered / reflected by the obstacle when an obstacle exists in the vicinity of the image of the light emitting portion. The optical detection device according to claim 23, further comprising an optical filter disposed on a light incident side of the photodetector. The light detection apparatus according to claim 23, wherein the light emitted from the light source is infrared light. 24. The light detection according to claim 23, wherein the light detector is disposed in the vicinity of the light source, and detects light scattered and reflected by the obstacle through the imaging optical system. apparatus. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
The photodetection device according to claim 23, wherein the photodetector is provided in a direction in which light is reflected by the reflective optical member. 28. The light according to claim 27, wherein the optical detector is provided at a position where an optical path length from the reflective optical member is substantially the same as an optical path length from the light source to the reflective optical member. Detection device. Optical path limiting means for detection provided between the reflective optical member and the photodetector at a position where the optical path length from the reflective optical member is substantially the same as the optical path length from the light source to the reflective optical member. 28. The photodetecting device according to claim 27, further comprising: A condensing optical system that is provided between the light source and the imaging optical system and condenses light from the light source;
24. The light detection device according to claim 23, further comprising: a light source path limiting unit provided in the vicinity of a focal position of the condensing optical system. A reflection optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
The photodetector is provided in the direction of light reflection by the reflective optical member, and the optical path length from the reflective optical member is substantially the same as the optical path length from the light source optical path limiting means to the reflective optical member. The photodetection device according to claim 30, wherein the photodetection device is provided at a position. A reflective optical member that reflects the light scattered and reflected by the obstacle and returned to the imaging optical system in a direction different from the light source;
A detection optical path limiting means provided between the reflective optical member and the photodetector;
The photodetector is provided in the direction of light reflection by the reflective optical member,
The detection optical path limiting means is provided at a position where an optical path length from the reflective optical member is substantially the same as an optical path length from the light source optical path limiting means to the reflective optical member. Item 30. The light detection device according to Item 30. 31. The light detection device according to claim 30, wherein the light detector is provided in the vicinity of the light path limiting means for the light source.

Images