JP4570145B2 - Optical position detection apparatus having an imaging unit outside a position detection plane - Google Patents

Description

  The present invention relates to an optical position detection apparatus, and more particularly, to an optical position detection apparatus that is easy to install by providing an imaging unit outside a position detection plane and that is simple in appearance and inexpensive.

  There is an apparatus for projecting an image by attaching a hologram screen or the like to a show window. Such a device is not limited to the conventional stationary product display, and can be used as a moving advertisement and has attracted attention.

  There is a projector that can further advance such a projection device on a show window and incorporate a touch panel function so that an interactive advertisement can be performed (Japanese Patent Laid-Open No. 2003-5617). This device adopts a transparent touch panel such as a resistive film type or a capacitance type touch panel as a touch panel, and forms a matrix of infrared by arranging a plurality of infrared light emitting units and light receiving units, and detects the position by blocking infrared rays. Was.

  In the case of such a touch panel system, it is necessary to provide a transparent electrode on the screen as a transparent touch panel, which causes a problem of light transmittance and a problem of durability of the touch panel. In addition, in the position detection using the infrared matrix, there is a problem that it is difficult to align the plurality of infrared light emitting units and the light receiving units, resulting in high manufacturing costs. Furthermore, it is necessary to provide a device for realizing the touch panel function outside the show window, which causes not only durability problems due to exposure to rain and wind but also mischief and theft problems. Furthermore, since it is necessary to install the apparatus outside, it is necessary to make a hole in the wall or glass for drawing in the cable, which is difficult to install in a tenant building or the like.

  As a solution to such problems, there is a combination of a show window and an optical position detection device (Japanese Patent Laid-Open No. 2004-54065). In this device, a sensor unit is installed in a show window using a prism mirror. Light from the light source of the sensor unit is reflected by the prism mirror and guided onto the position detection surface, and the position detection area of the indicator is displayed. The light enters the retroreflective frames provided on the three peripheral sides, retroreflects, passes through the position detection surface again, returns to the prism mirror, and the light reflected thereby is received by the light receiving element of the sensor unit. When the indicator blocks the light from the light source of the sensor unit, a shadow portion is generated in the light received by the light receiving element, and the position of the shadow is detected by the two sensor units. The indicated position is detected. By using a prism mirror, the sensor unit and the retroreflective frame can be provided in the show window, so that reliability and durability can be obtained.

JP2003-5617 JP 2004-54065 A

  The above Japanese Patent Application Laid-Open No. 2004-54065 attempts to solve the problems of the device disclosed in the above Japanese Patent Application Laid-Open No. 2003-5617, but in the case of the device disclosed in the above Japanese Patent Application Laid-Open No. 2004-54065, the light from the sensor is retroreflected and returned. Since the indicated position is detected based on the light blocking position, a retroreflective frame must be provided on the three sides around the position detection area. Therefore, the degree of freedom in design is small, and it is difficult to make the appearance simple.

  Furthermore, since the device disclosed in Japanese Patent Application Laid-Open No. 2004-54065 is a method for detecting the position of a shadow due to blockage as described above, when operating with a plurality of indicators, the portion where the indicators overlap as seen from the sensor It was impossible to discriminate, and operation with a plurality of indicators could not be performed. Therefore, for example, the display screen of the display device cannot be overlaid on the position detection area, and a volume knob or the like can be displayed on the display screen and operated.

  Further, in the case of the position detection device that determines the pointing position by detecting the shadow position of the pointer using the retroreflective frame, if the extraneous light is too strong, the pointer is more than the reflected light from the retroreflective frame. As a result, the shadow of the indicator cannot be detected. The apparatus disclosed in the above Japanese Patent Application Laid-Open No. 2004-54065 discloses a device that turns on and off the light source for such measures against external light. To realize this, a high-speed image sensor and a high-speed A are used. Since a processing circuit such as a / D converter is required, there is a problem that the apparatus becomes expensive.

  Furthermore, the alignment of the sensor and the retroreflective frame is not easy, adjustment is severe, and installation is difficult.

  In view of such circumstances, the present invention is intended to provide an optical position detection device that can be configured inexpensively, can be simply configured in appearance, can be easily installed, and can be applied to various applications.

  In order to achieve the above-described object of the present invention, an optical position detection device according to the present invention includes a plate-shaped member having a position detection region on one side and at least a part of which is transparent, Two area image sensors are provided on the side opposite to the surface having the position detection area, and each of the area image sensors is for capturing images of the indicator placed in the position detection area from two different locations in a predetermined imaging field of view. Imaging of the imaging unit so that the imaging member and the plate-like member on the surface side having the position detection region of the plate-like member are provided at positions where the plate-like member has transparency, and the imaging field of view of the imaging unit covers the entire position detection region. Imaging field reflecting means for reflecting the field of view.

  Furthermore, a plate-like member is provided on the surface opposite to the surface having the position detection area of the plate-like member, and the light source for uniformly illuminating the entire position detection area and the plate-like side of the surface having the position detection area of the plate-like member Illumination area reflecting means for reflecting the light from the light source so that the member is provided at a transparent position and the light from the light source uniformly illuminates the entire position detection area may be provided.

  Furthermore, the back surface illumination area reflection is provided on the surface side opposite to the surface having the position detection area of the plate member, at a position where the plate member is transparent, and reflects light from the light source to the illumination area reflection means. In this case, the illumination area reflecting means reflects light from the light source reflected by the back illumination area reflecting means. The back illumination area reflecting means may be a prism mirror or a half mirror. The illumination area reflecting means may be a prism mirror. Furthermore, the light source may be composed of LEDs arranged in a plurality of straight lines laterally with respect to the light emitting direction.

  Still further, the back surface imaging field provided on the surface opposite to the surface having the position detection region of the plate member at a position where the plate member has transparency, and reflects the imaging field of the imaging unit to the imaging field reflection means. In this case, the imaging field reflection unit reflects the imaging field of the imaging unit reflected by the back surface imaging field reflection unit. Here, the back surface imaging visual field reflection means is formed of a half mirror, and may further include a back surface position detection region on a surface opposite to the surface having the position detection region of the plate member.

  Further, the imaging field reflection means may be constituted by a prism mirror.

  Further, the imaging unit may have an automatic sensitivity adjustment function.

  Furthermore, it may have a peripheral frame provided at a position facing the imaging unit and covering at least three sides of the periphery of the position detection region, and the surface of the peripheral frame photographed by the imaging unit is a plate-like member. It suffices if the side close to the surface having the position detection region is dark and the far side is light.

  Furthermore, the plate member may have a display means on the surface opposite to the surface having the position detection area, so that the position detection area overlaps the plate member. What is necessary is just to have it. The display means may be a rear projection type projector, a liquid crystal display, or a plasma display.

  Furthermore, a processing means for performing a predetermined process according to the movement of the indicator when a plurality of indicators are photographed on the imaging unit may be provided. Here, when the movement of the indicator is a rotation operation that turns the knob, the processing means can also perform a predetermined rotation processing operation according to the rotation operation.

  Furthermore, the plate-like member can be a glass plate of a glass table.

  Note that the imaging unit can detect the distance to the captured image by processing by obtaining the correlation of the partial images of the captured images, and can exclude images outside the position detection region. . Here, the partial image may be an image obtained by extracting an edge.

  The optical position detection apparatus of the present invention has the advantages that a retroreflective frame or the like is not required, adjustment is easy, installation is easy, and appearance can be configured simply. Furthermore, when installing in a show window or the like, the imaging field of view of the imaging unit is also reflected, so that all equipment other than the reflective material can be installed outside the window area, and the appearance becomes very simple. There is also an advantage that a touch panel can be formed on both the front and back surfaces of the window at the same time.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1A and 1B are diagrams for explaining a first embodiment of the optical position detection device of the present invention. FIG. 1A is a schematic side view thereof, and FIG. 1B is a schematic plan view thereof. . As shown in the figure, an optical position detection apparatus according to a first embodiment of the present invention includes a glass plate 1 such as a show window, an imaging unit 2 having an area image sensor for imaging in a predetermined imaging field of view, and an imaging unit. The prism mirror 3 reflects the imaging field of view. In the present invention, the entire glass plate 1 does not necessarily have to be transparent depending on the application, and a predetermined portion, that is, a portion sandwiched between the imaging unit 2 and the prism mirror 3 only needs to be transparent.

  Moreover, the imaging part 2 has an area image sensor, and is installed in two places on the back surface side of the glass plate 1 as shown in FIGS. 1 (a) and 1 (b). In the present specification, the terms “back surface” and “front surface” are for convenience, and in the drawings, the left side in the side view, the front side in the plan view is “front surface”, and the opposite side is “back surface”. It is defined as

  By taking an image of the indicator 5 placed in the position detection area 4 by the two imaging units 2 installed at predetermined positions, the indication position of the indicator is detected by the principle of triangulation. Here, the area image sensor does not use all the pixels, but is a region from the glass plate 1 to a predetermined height, for example, a region from the surface of the glass plate 1 to a height of about 10 mm, The pixels in the range of the area that covers the entire detection area are selected and used. As a result, useless data transfer / processing for an unnecessary image outside the area is not required, so that even an area image sensor can perform high-speed processing. The height from the glass plate surface can be variously changed depending on the application.

  Further, the alignment of the imaging field of the imaging unit 2 in the height direction with respect to the glass plate 1 can be performed very easily by automatically selecting only necessary portions of pixels. Therefore, even if the installation position of the imaging unit 2 is shifted due to, for example, bending of a glass plate and the imaging visual field is changed, the height of the imaging visual field can be adjusted without physically moving the imaging unit. If it is difficult to detect the boundary surface of the glass plate 1, it is of course possible to detect the boundary with the glass plate 1 with a predetermined mark. For example, an ordinary show window or the like is embedded in the wall surface 10 but is usually covered with a dark material such as rubber packing between the wall surface, and therefore, a predetermined imaging field of view is set using the dark color portion as a mark. It may be defined. Instead of using such rubber packing or the like as a peripheral frame, a peripheral frame configured so that the side close to the glass plate 1 is dark and the far side is light is used around the position detection region for a boundary detection mark. Of course, it may be provided. Since the part imaged by the imaging unit 2 is the three sides of the position detection area, the peripheral frame may be provided so as to cover at least three sides around the position detection area 4.

  A prism mirror 3 for reflecting the imaging field of the imaging unit 2 provided on the back surface of the glass plate 1 so as to cover the entire position detection region 4 is provided on the front side of the glass plate 1. The prism mirror 3 may be a normal mirror, but the prism mirror is employed in the first embodiment because of ease of installation and durability. Note that the reflecting surface of the prism mirror may be formed by aluminum vapor deposition in order to prevent deterioration of reflection characteristics due to dirt. The angle of the reflecting surface of the prism mirror 3 is set to about 45 degrees so that the imaging field is refracted to about 90 degrees so that the imaging field runs in parallel on the glass plate 1. In order to prevent the imaging unit 2 from being reflected on the glass plate 1, as shown in FIG. 2, the imaging unit 2 is installed obliquely with respect to the glass plate 1, and the imaging field of view is parallel to the glass plate 1. Alternatively, the prism mirror 3 whose reflection surface is adjusted to a predetermined angle so as to run may be used.

  Furthermore, in the position detection apparatus according to the first embodiment of the present invention, a hologram screen 6 may be provided on the back side of the position detection area 4 so as to overlap the position detection area as shown in FIG. The image from the rear projection type projector 7 is projected onto the hologram screen 6. The projector 7 is connected to the computer 8, and the imaging unit 2 is also connected to the computer 8. By controlling input / output by the computer 8, a display device with a touch panel function can be realized. In the illustrated example, an example of a rear projection type projector and a hologram screen is shown, but the present invention is not limited to this, and any display such as a liquid crystal display or a plasma display can be applied.

  The imaging unit 2 preferably has an automatic sensitivity adjustment function as a measure against external light. In the present invention, since the image of the indicator is directly photographed, it is difficult to cause the problem due to the external light as in the prior art, but the indicator 5 and the surrounding image become too bright or dark due to a change in ambient brightness. If it passes, the indicator 5 may not be detected. For this reason, the sensitivity may be automatically adjusted by the imaging unit 2 so that the indicator 5 is always photographed with a constant contrast. This eliminates the need for measures against external light as mentioned in the problem of the device disclosed in the conventional Japanese Patent Application Laid-Open No. 2004-54065, and makes it possible to manufacture the device at low cost.

  In addition, when the position detection area 4 is not provided with a peripheral frame or the like, it may not be possible to determine whether the indicator is within the position detection area or outside the position detection area from the video imaged by the imaging unit 2. Therefore, for example, if the left hand is placed outside the position detection area and an attempt is made to operate the position detection area with the right hand, an image of the left hand is also captured, which may cause a malfunction. In order to prevent this, it is possible to detect the distance to the indicator and eliminate the image outside the position detection area by obtaining the correlation between the partial images of the images captured by the two imaging units 2 by the correlation method. Anyway. That is, in each imaging unit, an image in which two elongated images detected as indicators are captured is obtained. By processing the position of the image in these images by the correlation method, the center between the imaging units is obtained. Therefore, the image outside the position detection area may be excluded from the distance information. In addition, if the partial image used for the correlation method is an image from which an edge is extracted, the correlation can be easily obtained. For example, if the absolute value of the spatial differentiation of the original image is obtained and an image obtained by removing the absolute value lower than a predetermined threshold value is used in the correlation method, the edge of the indicator is emphasized and the correlation becomes easier to obtain.

  When the indicator is placed in the position detection region of such a position detection device, the image of the indicator is taken as it is on the imaging unit 2. More specifically, the image of the tip portion of the indicator that has entered the slightly height region on the glass plate 1 in the position detection region 4 is taken as it is. Then, by capturing the image of the indicator with the two imaging units 2 placed at predetermined positions, the indicated position coordinates of the indicator can be detected from the position of the captured image by the principle of triangulation. The designated position coordinates may be calculated by the computer 8 or the like using an image photographed by the imaging unit 2, or may be calculated by providing a DSP or the like in the imaging unit 2. Here, since the imaging unit 2 of the present invention uses an area image sensor and captures the image of the indicator as it is, it can be determined whether the indicator is a finger, a pen, or even a palm. The so-called hand-held state that is not intended to be operated can be instantly determined from the captured image on the imaging unit side. Therefore, it becomes very convenient in operation. If all the pixels of the area image sensor are used, the amount of data to be processed becomes enormous and a high-speed processing device is required. In the case of the position detection device of the present invention, it is necessary for position detection among the pixels of the area image sensor. Since it is possible to perform detection processing using only pixels of a predetermined necessary part, it is possible to realize a position detection device having a level with no problem in detection speed without using a high-speed processing device. .

  Further, according to the present invention, since the image of the indicator is taken as it is by the area image sensor, for example, even a fine movement of the fingertip can be accurately detected. Therefore, a predetermined process may be performed according to the movement of the indicator. That is, the movement of the photographed indicator 5 is analyzed by the computer 8, for example, when two indicators are input and when they move, the display screen 6 performs zoom display according to the operation. Is possible. Furthermore, according to the position detection device of the present invention, even when a volume knob-like object is displayed on the display screen and the operation of pinching the object with a finger is performed, the image of the indicator is kept as it is. Since shooting is performed, it is possible to detect the movement. Then, in response to this, the computer 8 performs a predetermined rotation processing operation, and for example, processing such as increasing the volume of the sound becomes possible. The position detection device using the retroreflective frame described in the prior art is a method for detecting a shadow portion, so that it is not detected when the pointers overlap each other, and it is particularly difficult to detect such a rotation operation. However, according to the present invention, such an operation can be easily detected.

  Next, a position detection apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3A shows a schematic side view of the position detection apparatus of the second embodiment, and FIG. 3B shows a schematic plan view thereof. In the figure, the same reference numerals as those in FIG. 1 denote the same components, and the basic configuration is the same as that of the first embodiment shown in FIG. As shown in FIG. 3, the imaging unit 2 is provided outside the area of the glass plate 1, and a back prism mirror 3 'for reflecting the imaging field on the back side is further provided.

  More specifically, the imaging unit 2 is provided at a predetermined position outside the area of the glass plate 1, for example. Of course, this may be provided in the region of the glass plate 1, but it is preferably provided outside the region of the glass plate 1 in order to obtain an effect of simplifying the appearance. A back-surface prism mirror 3 ′ for reflecting the imaging field is provided on the surface of the glass plate 1 opposite to the surface of the position detection region 4. The back prism mirror 3 ′ is provided in a portion where the glass plate 1 is transmissive, and is configured such that the imaging field of view is reflected on the prism mirror 3 on the front side of the glass plate 1.

  The imaging field of the imaging unit 2 is incident on the back prism mirror 3 ′, where it is refracted by approximately 90 degrees, enters the prism mirror 3 through the transparent portion of the glass plate 1, and further is approximately 90 here. By being refracted each time, the entire position detection area 4 is covered. Similarly to the prism mirror 3, the back prism mirror 3 ′ may be formed by aluminum deposition with a reflective surface of about 45 degrees. Further, like the prism mirror 3, this is not limited to a prism mirror, but may be a normal mirror.

  With this configuration, only the prism mirror is installed in the region of the glass plate 1, so that it is not necessary to consider a method for fixing the imaging unit to the glass plate and the installation is easy. Moreover, since it becomes unnecessary to arrange | position the apparatus which is conspicuous in a glass plate area | region, it looks very simple.

  In the illustrated example, a planar prism mirror is used, so that the imaging field of view is a mirror wider than the mirror illustrated in FIG. 1 so as to cover the entire position detection region. However, the present invention is not limited to this, and by making the mirror a curved mirror and making the angle of view of the imaging unit narrower, the width can be made narrower than the prism mirror shown in FIG. Is possible.

  Furthermore, as shown in FIG. 4, it is also possible to use a half mirror 30 as a back reflector in place of the back prism mirror 3. By using the half mirror 30, the imaging field refracted by the half mirror 30 enters the prism mirror 3 on the front side, while the imaging field transmitted through the half mirror goes to the back side of the glass plate 1. By configuring the imaging field on the back side so as to proceed in parallel with the glass plate 1, it is possible to provide a position detection region on the back side. As a result, both sides of the glass plate can be used as position detection regions, and a user-friendly device that can be applied to various applications can be realized.

  Next, a position detection apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5A shows a schematic side view of the position detection apparatus according to the third embodiment, and FIG. 5B shows a schematic plan view thereof. In the figure, the same reference numerals as those in FIG. 1 denote the same components, and the basic configuration is the same as that of the first embodiment shown in FIG. As shown in FIG. 5, a light source and a prism mirror for uniformly illuminating the entire position detection region are further provided. In the first embodiment, surrounding natural light is used as a light source, and the illuminated indicator is photographed. However, since the indicator may be difficult to detect when the surroundings are dark, such as at night, in this embodiment, the entire position detection region is uniformly illuminated with a light source such as an LED. Hereinafter, it will be described in more detail with reference to the drawings. As shown in the drawing, the third embodiment of the present invention includes a light source 20 provided on the side opposite to the surface having the position detection region 4 and an illumination prism mirror 21 provided on the surface side having the position detection region 4. And are provided. The light source 20 and the illumination prism mirror 21 are provided at a position where the glass plate 1 between them has transparency.

  In the example of illustration, the light source 20 has shown what consists of LED arranged in multiple linear form horizontally. The LED is, for example, an infrared light emitting LED. However, the light source of the present invention is not limited to this, and any light source that can uniformly illuminate the entire position detection region, such as a surface light source or a fluorescent tube, may be used. Furthermore, in the case of an example in which a display device such as a liquid crystal display or a plasma display is provided on the back surface of the position detection region, the light itself emitted from the display device illuminates the entire position detection region uniformly, and thus a separate LED or the like There is a case where it is not necessary to provide.

  The illumination prism mirror 21 may be formed by aluminum vapor deposition with a reflective surface of about 45 degrees as in the case of the prism mirror 3 provided for the imaging unit 2. Further, like the imaging unit prism mirror 3, this is not limited to a prism mirror but may be a normal mirror.

  The light emitted from the light source 20 is applied to the illumination prism mirror 21 through the transparent portion of the glass plate 1 and is refracted by 90 degrees by the illumination prism mirror 21 so that the entire position detection region 4 is uniform. Illuminate. The indicator 5 placed in the position detection region 4 is illuminated by this illumination, and the image is taken by the imaging unit 2. Similar to the configuration of the image pickup unit, since the light source can be provided inside the window, there is no problem in drawing in the cable.

  In the third embodiment shown in FIG. 5, the light source and the illuminating prism mirror are provided between the two image pickup units. However, the present invention is not limited to this, and the position where the entire position detection area can be illuminated uniformly. If so, the positions of the light source and the illumination prism mirror may be any positions.

  Furthermore, as shown in FIG. 6, the light source 20 may be provided on a wall surface outside the glass plate region, for example, and a back surface illumination prism mirror 21 ′ may be provided on the back surface side of the glass plate 1. The light from the light source 20 is incident on the backside illumination prism mirror 21 ′, where it is refracted approximately 90 degrees, enters the illumination prism mirror 21 through the transparent portion of the glass plate 1, and further here. The entire position detection area is illuminated uniformly by being refracted at approximately 90 degrees.

  Note that the backside illumination prism mirror 21 ′ may be a half mirror. By using the half mirror, the light from the light source refracted by the half mirror enters the prism mirror 21 on the front side, while the light from the light source transmitted through the half mirror goes to the back side of the glass plate 1. By configuring the light on the back surface side so as to travel parallel to the glass plate 1, when the position detection region is also provided on the back surface side as described in FIG. It becomes possible to illuminate uniformly.

  Although all the above illustrated examples show that the position detection device is installed on a vertically standing glass plate such as a show window, the following examples will explain examples in which the position detection device is installed on something other than a window. FIG. 7 is a schematic perspective view when the position detection device of the present invention is applied to a glass table whose table surface is made of a glass plate. As shown in the figure, the prism mirror 3 is provided on the glass plate 1 of the glass table 11, the imaging unit 2 and the display device 9 are provided on the back side, and these are connected to the computer 8. Thereby, the position detection apparatus which uses the glass plate of a glass table as a position detection area | region is realizable. Similar to the examples described so far, it is also possible to apply a configuration in which the position of the imaging unit 2 is set on the edge portion of the glass table using a back prism mirror so that it is not noticeable or a light source is provided.

  When the position detection device of the present invention is applied to a glass table, the imaging unit is an area image sensor, and the image of the indicator is captured as it is, so that an image of the palm other than that indicated by the indicator or a right-handed person Even when the left hand is attached to the position detection area, it is possible to configure so as not to malfunction.

  The optical position detection device of the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a diagram for explaining a first embodiment of the position detecting device of the present invention, in which FIG. 1 (a) is a schematic side view thereof, and FIG. 1 (b) is a schematic plan view thereof. FIG. 2 is a schematic side view for explaining an example in which the imaging unit of the position detection device of the present invention is installed obliquely with respect to the glass plate. FIG. 3 is a view for explaining a second embodiment of the position detecting device of the present invention, FIG. 3 (a) is a schematic side view thereof, and FIG. 3 (b) is a schematic plan view thereof. FIG. 4 is a schematic side view for explaining an example in which the back prism mirror of the second embodiment of FIG. 3 is constituted by a half mirror. FIG. 5 is a view for explaining a third embodiment of the position detecting device of the present invention, FIG. 5 (a) is a schematic side view thereof, and FIG. 5 (b) is a schematic plan view thereof. FIG. 6 is a schematic side view for explaining an example in which the light source of the position detection device of the present invention is provided on the wall surface outside the glass plate. FIG. 7 is a schematic perspective view for explaining an example in which the position detection device of the present invention is applied to a glass table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass plate 2 Image pick-up part 3 Prism mirror 3 'Back surface prism mirror 4 Position detection area 5 Indicator 6 Display screen 7 Projector 8 Computer 9 Display apparatus 10 Wall surface 11 Glass table 20 Light source 21 Illumination prism mirror 21' Back surface illumination prism mirror 30 half mirror

Claims (16)

An optical position detection device for detecting a specified position coordinate of a pointer placed in a position detection region, the device comprising:
A plate-like member having a position detection region on one side thereof and having at least a part of transparency;
Provided on the surface of the plate-like member opposite to the surface having the position detection region, for photographing each of the images of the indicator placed in the position detection region in a predetermined imaging field from two different locations, Two imaging units consisting of area image sensors;
The surface side of the plate-like member having the position detection region is provided at a position where the plate-like member has transparency, and an imaging field of view of the imaging unit is through a portion where the plate-like member is transparent, An imaging field reflecting means for reflecting an imaging field of the imaging unit so as to cover the entire position detection region;
A light source for illuminating the entire position detection region, provided on the surface of the plate-like member opposite to the surface having the position detection region and between the imaging units, A light source composed of LEDs arranged in a straight line,
The surface side of the plate-like member having the position detection region is provided at a position where the plate-like member has transparency, and the light from the light source passes through the portion where the plate-like member is transparent. Illumination area reflecting means for reflecting light from the light source so as to illuminate the entire position detection area;
An optical position detection apparatus having an imaging unit outside the position detection plane. The optical position detection device according to claim 1 , wherein the plate-like member is further provided at a position where the plate-like member is transmissive on the opposite side of the surface of the plate-like member having the position detection region. A back illumination area reflecting means for reflecting the light from the light source to the illumination area reflecting means, and the illumination area reflecting means reflects the light from the light source reflected by the back illumination area reflecting means. An optical position detection device characterized by the above. 3. The optical position detection apparatus according to claim 2 , wherein the back illumination area reflecting means is formed of a prism mirror or a half mirror. The optical position detection apparatus according to any one of claims 1 to 3, wherein the illumination area reflecting means, the optical position detection apparatus characterized by comprising a prism mirror. An optical position detection apparatus according to any one of claims 1 to 4, further of the plate above the position detection region surface having opposite side of the member, the plate-like member permeable A back surface imaging field reflection unit that reflects the imaging field of the imaging unit to the imaging field reflection unit, and the imaging field reflection unit reflects the imaging reflected by the back surface imaging field reflection unit. An optical position detection apparatus that reflects an imaging field of view of a part. 6. The optical position detection apparatus according to claim 5 , wherein the back surface imaging visual field reflection means is formed of a half mirror, and further, a back surface position detection is performed on the surface of the plate member opposite to the surface having the position detection region. An optical position detection device comprising a region. The optical position detection apparatus according to any one of claims 1 to 6, wherein the imaging field reflecting means, the optical position detection apparatus characterized by comprising a prism mirror. The optical position detection apparatus according to any one of claims 1 to 7, wherein the imaging unit, the optical position detection apparatus characterized by having an automatic sensitivity adjustment function. The optical position detection device according to any one of claims 1 to 8 , further provided at a position facing the imaging unit and surrounding at least three sides around the position detection area. An optical system characterized in that the surface of the peripheral frame that has a frame and is photographed by the imaging unit has a dark color on the side close to the surface having the position detection region of the plate-like member and a light color on the far side. Position detection device. An optical position detection apparatus according to any one of claims 1 to 9, further so as to overlap with the position detection region on the opposite side of the surface having the position detection area of the plate-like member The optical position detection device according to claim 1, further comprising display means, wherein the position of the position detection region of the plate member is transparent. 11. The optical position detection apparatus according to claim 10 , wherein the display means is a rear projection type projector, a liquid crystal display, or a plasma display. An optical position detection apparatus according to any one of claims 1 to 11, further performs predetermined processing according to the movement of the pointer when the plurality of pointer to the imaging unit was taken An optical position detection device comprising processing means. 13. The optical position detection device according to claim 12 , wherein when the movement of the indicator is a rotation operation that turns a knob, the processing means performs a predetermined rotation processing operation according to the rotation operation. An optical position detection device. The optical position detection apparatus according to any one of claims 1 to 13, wherein the plate-like member, the optical position detection apparatus which is a glass plate of the glass table. The optical position detection apparatus according to any one of claims 1 to 14, wherein the imaging unit until captured image by processing by correlating the partial image of the captured image in each An optical position detection apparatus that detects a distance and eliminates an image outside the position detection region. 16. The optical position detection apparatus according to claim 15 , wherein the partial image is an image obtained by extracting an edge.