JP2012108019A - Optical position detection apparatus and device with position detecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical position detection apparatus capable of detecting a position of an object over a wide area even when the number of detecting light source parts is small, and to provide a device with a position detecting function.SOLUTION: An optical position detection apparatus 10 emits detection light L2 from a first detecting light source part 12A and a second detecting light source part 12B and receives a part of the detection light L2 reflected by an object Ob in a detection target space 10R by a light detection part 30 to detect a position of the object Ob. The first detecting light source part 12A and the second detecting light source part 12B are separated from the detection target space 10R in an X-axis direction, and the light detection part 30 is separated from the detection target space 10R in a Y-axis direction further than the first detecting light source part 12A and the second detecting light source part 12B. Thereby, a specific position of the object Ob, at which the detection light L2 is regularly reflected by the object Ob and made incident on the light detection part 30, can be further shifted to the outside in the X-axis direction.

Description

  The present invention relates to an optical position detection device that optically detects the position of a target object, and a device with a position detection function including the optical position detection device.

  As an optical position detection device that optically detects a target object, for example, detection light is emitted from each of a plurality of light source units for detection toward the target object via a translucent member and reflected by the target object. There has been proposed a method in which light is transmitted through a translucent member and detected by a light detection unit. In the optical position detection device having such a configuration, the position of the target object is detected based on the detection result of the detection light in the light detection unit (see, for example, Patent Document 1).

  In addition, a light guide plate is provided in the optical position detection device, and the detection light emitted from each of the plurality of light source units for detection is emitted toward the target object via the light guide plate, and the detection light reflected by the target object is output. A method of detecting by a light detection unit has also been proposed (see Patent Documents 2 and 3).

Special Table 2003-534554 JP 2010-127671 A JP 2009-295318 A

  However, in the optical position detection devices described in Patent Documents 1 to 3, since the range in which the position of the target object can be detected is narrow, the screen surface side of the projection display device, the screen surface side of the electronic blackboard, and digital signage display When detecting the position of the target object in a wide area such as the surface side, there is a problem that the number of light source units for detection and light detection units must be increased.

  In view of the above problems, an object of the present invention is to provide an optical position detection device capable of detecting the position of a target object over a wide area even with a small number of light source units for detection, and such an optical position. The object is to provide a device with a position detection function provided with a detection device.

  In order to solve the above-described problems, the present invention provides an optical position detection device that optically detects at least a position of a target object in a detection target space in a first direction, the second direction intersecting the first direction. And a first detection light source unit that emits detection light toward the detection target space at a position separated from the detection target space in the first direction, and the detection in the direction opposite to the first direction and the second direction. A second detection light source unit that emits detection light toward the detection target space at a position separated from the target space, and between the first detection light source unit and the second detection light source unit in the first direction. A light detection unit that receives the detection light reflected by the target object in the detection target space at a position separated from the detection target space in the second direction, and a first detection light source unit; A light source driving unit for driving the second detection light source unit, and a light reception result of the light detection unit when the light source driving unit sequentially turns on the first detection light source unit and the second detection light source unit. And a position detector that detects a position of the elephant object in the first direction.

  In the present invention, “detecting the position of the target object based on the“ light reception result of the light detection unit ”” refers to detecting the position of the target object using the light reception intensity itself in the light detection unit, and in the light detection unit. This means that both the case where the position of the target object is detected based on the current value (control amount) when the current value supplied to the light source for detection is adjusted so that the received light intensity becomes a predetermined value.

  In the optical position detection device to which the present invention is applied, the first detection light source unit and the second detection light source unit emit detection light toward the detection target space and are reflected by the target object located in the detection target space. Light is received by the light detection unit. Here, the first light source unit for detection and the second light source unit for detection are separated in the first direction. For this reason, if the ratio or difference between the received light intensity at the light detection unit when the first detection light source unit is turned on and the received light intensity at the light detection unit when the second detection light source unit is turned on, A ratio between the distance in the first direction from the first light source for detection to the target object and the distance in the first direction from the second light source for detection to the target object is known. Alternatively, for the first detection, the light reception intensity at the light detection unit when the first detection light source unit is turned on is equal to the light reception intensity at the light detection unit when the second detection light source unit is turned on. The distance and the second detection in the first direction from the first light source unit for detection to the target object can be obtained using the ratio or difference of the current values after adjusting the current value supplied to the light source unit and the second light source unit for detection. A ratio with the distance in the first direction from the light source unit to the target object is known. Therefore, if the geometric line is obtained with reference to the position of the first light source unit for detection and the position of the second light source unit for detection, the target object is positioned on the geometric line, so the first direction of the target object The position at can be determined. Here, the first detection light source unit and the second detection light source unit are separated from the detection target space in the first direction and the direction opposite to the first direction. For this reason, compared with the case where the first light source unit for detection is not spaced apart from the detection target space in the first direction, the detection light emitted from the first light source unit for detection is regularly reflected and the light detection unit. The singular position of the target object that is incident on can be shifted outward in the first direction. Similarly, the detection light emitted from the second detection light source unit is regularly reflected and compared with the case where the second detection light source unit is not separated from the detection target space in the second direction. It is possible to shift the singular position of the target object that is incident on the outside in the direction opposite to the first direction. Therefore, even when the position of the target object is detected by a small number of light source units such as the first detection light source unit and the second detection light source unit, the detection target space can be set wide in the first direction.

  In this invention, it is preferable that the said light detection part is provided in the position away from the said 1st light source part for a detection and the said 2nd light source part for a detection in the said 2nd direction. According to such a configuration, it is possible to shift the singular position of the target object in the first direction so that the detection light emitted from the first detection light source unit is regularly reflected and enters the light detection unit. Similarly, the singular position of the target object in which the detection light emitted from the second light source unit for detection is specularly reflected and enters the light detection unit can be shifted outward in the direction opposite to the first direction. Therefore, even when the position of the target object is detected by a small number of light source units such as the first detection light source unit and the second detection light source unit, the detection target space can be set wider in the first direction.

  In the present invention, the first detection light source unit may be configured to be arranged symmetrically with the second detection light source unit around the light detection unit and the detection target space in the first direction. it can. According to such a configuration, the detection accuracy in the detection target space can be made symmetric.

  In the present invention, the position detection unit includes a light reception result of the light detection unit when the light source driving unit simultaneously turns on the first light source unit for detection and the second light source unit for detection, or the light source driving unit. Detects a position of the target object in the second direction based on a result of combining light reception results of the light detection unit when the first detection light source unit and the second detection light source unit are sequentially turned on. It is preferable. Here, the result of combining the light reception results of the light detection unit is supplied to the light source unit for detection so that the sum of the light reception intensity itself in the light detection unit and the light reception intensity in the light detection unit become a predetermined value. It means to include both the sum of current values (control amounts) when the current value is adjusted. According to this configuration, the received light intensity at the light detection unit when the first detection light source unit and the second detection light source unit are simultaneously turned on, or the first detection light source unit and the second detection light source unit are sequentially turned on. According to the result of synthesizing the received light intensity at the light detection unit in this case, the position of the target object in the second direction can be known. In addition, the first detection light source unit and the second detection light source unit are arranged so that the received light intensity at the light detection unit when the first detection light source unit and the second detection light source unit are simultaneously turned on becomes a predetermined value. For the first detection, the sum of the current values at the time of driving and the sum of the received light intensity at the light detection unit when the first detection light source unit and the second detection light source unit are sequentially turned on become a predetermined value. The position of the target object in the second direction can also be determined from the sum of the current values when the light source unit and the second light source unit for detection are driven. Therefore, the position of the target object in the first direction and the position in the second direction can be determined simply by using two detection light source units (first detection light source unit and second detection light source unit) as the detection light source unit. Can be detected. In detecting the second position, the light reception result of the light detection unit when the first detection light source unit and the second detection light source unit are turned on simultaneously, or the first detection light source unit and the second detection light source. Since the result of combining the light reception results of the light detection units when the units are sequentially turned on is used, even if the target object is separated from the first detection light source unit and the second detection light source unit, the second target object The position in the direction can be detected, and the detection target range of the second position is wide.

  In the present invention, a light source for reference that emits reference light incident on the light detection unit without passing through an emission space of the detection light is provided, and the position detection unit is based on a light reception result of the light detection unit. The position of the target object is detected based on a result obtained by differentiating the first detection light source unit and the reference light source and a result obtained by differentiating the second detection light source unit and the reference light source. It is preferable. According to this configuration, the position of the target object can be detected without being affected by ambient light.

  In the present invention, the detection light is preferably infrared light. According to such a configuration, since the detection light is not visually recognized, the optical position detection device can be used for various devices, for example, the display is not hindered even when the optical position detection device is provided in the display device.

  The optical position detection device to which the present invention is applied can be used for, for example, a device with a position detection function having a viewing surface constituent member having a viewing surface extending along the first direction and the second direction. Examples of the device with a position detection function include the following devices.

  First, the viewing surface constituent member can adopt a configuration that is a direct-view image generation device that displays an image as information. In this case, the viewing surface is an image on which the image is displayed in the direct-view image generation device. It is a display surface. According to this configuration, the device with a position detection function can be configured as a direct view display device with a position detection function.

  In the present invention, the viewing surface constituting member can adopt a configuration that is a screen or a display plate. In this case, the viewing surface is a display surface on which information is visually recognized on the screen or the display plate.

  In the present invention, an image projection device for projecting an image toward the screen is provided on the viewing surface side with respect to the screen, and the detection light source unit and the light detection unit are arranged integrally with the image projection device. It is also possible to adopt the configuration. According to this configuration, the device with a position detection function can be configured as a projection display device with a position detection function.

  In the present invention, the viewing surface constituent member may employ a configuration that is a translucent member that covers the exhibit as the information. In this case, the viewing surface is arranged on the translucent member. This is the surface on which the exhibit is viewed on the opposite side of the display side. According to this configuration, the device with a position detection function can be configured as a window with a position detection function.

  In the present invention, the viewing surface constituent member may employ a configuration that is a base that supports a moving game medium. In this case, the visual surface is formed between the base and the game medium on the base. The relative position is the surface that is visually recognized as the information. According to such a configuration, the device with a position detection function can be configured as an amusement device such as a pachinko machine or a coin game.

It is explanatory drawing which shows typically the principal part of the apparatus with a position detection function which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the light source device etc. of the optical position detection apparatus used for the apparatus with a position detection function which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows typically the positional relationship of the detection object space in the optical position detection apparatus which concerns on Embodiment 1 of this invention, the light source part for a detection, and a photon detection part. It is explanatory drawing which shows typically the principal part of the apparatus with a position detection function which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows structures, such as a light source device of the optical position detection apparatus used for the apparatus with a position detection function which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows typically the positional relationship of the detection object space, the light source part for a detection, and the light detection part in the optical position detection apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the specific example 1 (projection type display apparatus with a position detection function) of the apparatus with a position detection function to which this invention is applied. It is explanatory drawing of the specific example 2 (window with a position detection function) of the apparatus with a position detection function to which this invention is applied. It is explanatory drawing of the specific example 3 (amusement apparatus with a position detection function) of the apparatus with a position detection function to which this invention is applied.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the directions intersecting each other are defined as the X-axis direction and the Y-axis direction, the directions intersecting the X-axis direction and the Y-axis direction are defined as the Z-axis direction, and the detection light emission direction is defined as the Y-axis direction. To do. In the drawings referred to below, one side in the X-axis direction is the X1 side, the other side is the X2 side, one side in the Y-axis direction is the Y1 side, the other side is the Y2 side, and one side in the Z-axis direction. Is the Z1 side, and the other side is the Z2 side. The “first direction” in the present invention corresponds to one side X1 in the X-axis direction, and the “second direction” in the present invention is one side in the Y-axis direction. Corresponds to Y1.

[Embodiment 1]
(overall structure)
FIG. 1 is an explanatory view schematically showing a main part of a device with a position detection function according to Embodiment 1 of the present invention. FIGS. 1 (a) and 1 (b) show a detection light source unit for detection light. It is explanatory drawing when it sees from the output space side, and explanatory drawing when the light source part for a detection is seen from the side. FIG. 2 is an explanatory diagram showing a configuration of a light source device and the like of the optical position detection device used in the device with a position detection function according to the first embodiment of the present invention, and FIGS. It is a top view when the light source part for a detection is seen from the emission space of detection light, and explanatory drawing which shows an electric structure.

  1 (a), 1 (b), and 2 (a), the device 1 with a position detection function of this embodiment includes a viewing surface constituting member 40 including a viewing surface 41 on which information is visually recognized, and a viewing surface constituting member. And an optical position detection device 10 for detecting the position of the target object Ob located on the viewing surface 41 side (one side Z1 in the Z-axis direction) with respect to 40, and a screen with a position detection function for an electronic blackboard It can be used as a screen device with a position detection function for a device or a projection display device.

  The optical position detection device 10 includes a light source device 11 including a plurality of detection light source units 12 that emit detection light L2 from one side Y1 in the Y-axis direction toward the other side Y2, and one side Y1 in the Y-axis direction. And a photodetector 30 with the detection surface 31 facing the other side Y2. The viewing surface constituent member 40 is made of a sheet-like or plate-like light transmitting member or the like, and includes a viewing surface 41 that extends along the X-axis direction and the Y-axis direction.

(Schematic configuration of the light source device 11)
The light source device 11 includes, as a plurality of detection light source units 12, a first detection light source unit 12 </ b> A arranged along a side portion extending in the X-axis direction on one side Y <b> 1 in the Y-axis direction of the viewing surface constituting member 40. And a second light source unit 12B for detection. The first detection light source unit 12A and the second detection light source unit 12B are separated in the X-axis direction and are in the same position in the Y-axis direction.

  In addition, the optical position detection device 10 includes a photodetector 30 at a side portion extending in the X-axis direction on one side Y1 in the Y-axis direction in the viewing surface constituting member 40. The photodetector 30 is disposed between the first detection light source unit 12A and the second detection light source unit 12B in the X-axis direction, and includes the first detection light source unit 12A and the second detection light source unit 12B. They are separated from each other in the X-axis direction. In this embodiment, the photodetector 30 is located at the same position as the first detection light source unit 12A and the second detection light source unit 12B in the Y-axis direction. Therefore, the first detection light source unit 12A, the photodetector 30, and the second detection light source unit 12B are arranged in this order on the same straight line in the X-axis direction. Further, the photodetector 30, the first light source unit 12A for detection, and the second light source unit 12B for detection are in a position protruding from the viewing surface constituent member 40 to the one side Z1 in the Z-axis direction.

  Here, the center optical axes of the detection light source unit 12 (the first detection light source unit 12A and the second detection light source unit 12B) are parallel to each other. Further, the central optical axis of the light source unit for detection 12 is also parallel to the viewing surface 41 of the viewing surface constituent member 40. For this reason, the detection light source unit 12 (the first detection light source unit 12A and the second detection light source unit 12B) has the detection light L2 (detection light L2a, L2b) along the viewing surface 41 side in the viewing surface constituent member 40. ). Therefore, as shown by the dotted lines in FIGS. 1A and 1B, in this embodiment, the entire space on the side of the viewing surface constituting member 40 where the viewing surface 41 is located is the emission space of the detection light L2. The emission space constitutes a detection target space 10R in which the position of the target object Ob is detected. When the target object Ob exists in the detection target space 10R set in this way, the detection light L2 (detection light) emitted from the detection light source unit 12 (the first detection light source unit 12A and the second detection light source unit 12B). Part of L2a and L2b) is reflected by the target object Ob, and part of the reflected light L3 is received by the photodetector 30.

  Each of the first detection light source unit 12A and the second detection light source unit 12B is configured by an LED (light emitting diode) or the like, and emits detection light L2a and L2b made of infrared light having a peak wavelength of 840 to 1000 nm. To release as. In the first detection light source unit 12A and the second detection light source unit 12B, an optical sheet (not shown) such as a scattering sheet is preferably disposed on the front surface of the LED. The photodetector 30 includes a photodiode, a phototransistor, and the like. In this embodiment, the photodetector 30 is a photodiode having a sensitivity peak in the infrared region. The light detector 30 and the detection light source unit 12 are electrically connected to the light source driving unit 14 and the position detection unit 50 shown in FIG.

  In the optical position detection device 10, the light source device 11 includes a reference light source 12R having a light emitting portion directed to the photodetector 30 between the photodetector 30 and the first detection light source portion 12A. The light source 12R for reference is also in the position which protruded from the visual recognition surface structural member 40 to the one side Z1 of the Z-axis direction like the photodetector 30, the first light source unit 12A for detection, and the second light source unit 12B for detection. Therefore, the first detection light source unit 12A, the reference light source 12R, the photodetector 30, and the second detection light source unit 12B are arranged in this order on the same straight line in the X-axis direction. The reference light source 12R is configured by an LED (light emitting diode) or the like, and the reference light source 12R emits reference light Lr composed of infrared light having a peak wavelength of 840 to 1000 nm as divergent light. However, the reference light Lr emitted from the reference light source 12R is on the side of the visual recognition surface 41 of the visual recognition surface component 40 due to the orientation of the reference light source 12R, a light shielding cover (not shown) provided on the reference light source 12R, and the like. The light does not enter the (detection target space 10R) and enters the photodetector 30 without passing through the detection target space 10R.

  In the optical position detection device 10 configured as described above, the light detector 30 and the light source device 11 (the first detection light source unit 12A, the second detection light source unit 12B, and the reference light source 12R) are configured as viewing surfaces. It is disposed along one side portion of the member 40. Therefore, in this embodiment, the photodetector 30 and the light source device 11 are housed in a common housing 19 indicated by a two-dot chain line, and are integrated as an optical unit 18.

(Configuration of position detector, etc.)
As illustrated in FIG. 2B, the light source device 11 includes a light source driving unit 14 that drives a plurality of detection light source units 12. The light source drive unit 14 drives the detection light source unit 12 and the reference light source 12R, and the lighting patterns of the plurality of detection light source units 12 and the reference light source 12R via the light source drive circuit 140. And a light source control unit 145 for controlling. The light source drive circuit 140 includes light source drive circuits 140a and 140b for driving the first detection light source unit 12A and the second detection light source unit 12B, and a light source drive circuit 140r for driving the reference light source 12R. The light source drive circuits 140a and 140b may employ a configuration in which a plurality of light source units for detection 12 are driven by a common light source drive circuit 140 by using a switching circuit or the like.

  A position detector 50 is electrically connected to the photodetector 30, and the detection result of the photodetector 30 is output to the position detector 50. The position detection unit 50 includes a signal processing unit 55 for detecting the position of the target object Ob based on the detection result of the photodetector 30, and the X coordinate (position in the first direction (first position) of the target object Ob. ) And a Y coordinate (a position in the second direction (second position)) and an XY coordinate detection unit 52. The position detection unit 50 and the light source driving unit 14 configured as described above operate in conjunction with each other and perform position detection described later.

(X-coordinate information detection principle)
In the optical position detection device 10 of the present embodiment, as described below, two detection light sources are obtained by the differential between the detection light source units 12 or the differential between the detection light source unit 12 and the reference light source 12R. The ratio of the distance between one detection light source unit 12 and the target object Ob of the unit 12 and the distance between the other detection light source unit 12 and the target object Ob is obtained, and based on the ratio, the target object Ob Get X coordinate information. Hereinafter, based on the light reception result of the photodetector 30, the X coordinate information of the target object Ob is obtained using the result obtained by differentiating the first detection light source unit 12A and the second detection light source unit 12B. The basic principle will be described.

In the optical position detection device 10 of the present embodiment, a target is obtained by utilizing the difference between the detection light L2a emitted from the first detection light source unit 12A and the detection light L2b emitted from the second detection light source unit 12B. In order to obtain the position information of the object Ob, the first detection light source unit 12A and the second detection light source unit 12B are sequentially turned on. More specifically, while the first detection light source unit 12A is turned on in the first period, the second detection light source unit 12B is turned off, and in the second period, the first detection light source unit 12A is turned off. 2 The light source unit 12B for detection is turned on. During this period, when the target object Ob is placed in the detection target space 10R, the detection lights L2a and L2b are reflected by the target object Ob, and a part of the reflected light L3 is detected by the photodetector 30. At that time, the control amount (drive current) for the first detection light source unit 12A so that the detection value of the photodetector 30 in the first period is equal to the detection value of the photodetector 30 in the second period. The drive current when adjusting the drive current and the drive current when adjusting the control amount (drive current) for the second detection light source unit 12B are adjusted. Then, the ratio and adjustment amount of the control amount (drive current I _A ) for the first light source unit 12A after adjustment and the control amount (drive current I _B ) for the second light source unit 12B after adjustment. If the ratio is used, it is possible to detect at which position the target object Ob exists in the X-axis direction.

  Here, the optical position detection apparatus 10 includes a reference light source 12R. Therefore, in this embodiment, instead of direct differential between the detection lights L2a and L2b, the differential between the detection light L2a and the reference light Lr and the differential between the detection light L2b and the reference light Lr are used. Finally, the same result as that obtained when the detection lights L2a and L2b are differentiated is derived. The differential between the detection light L2a and the reference light Lr and the differential between the detection light L2b and the reference light Lr are performed as follows.

First, the received light intensity of the reference light Lr emitted from the reference light source 12R at the photodetector 30 is constant regardless of the position of the target object Ob. Accordingly, in the first period, the light receiving intensity of the detection light L2a at the light detector 30 and the light receiving intensity of the reference light Lr at the light detector 30 are equal to the first detection light source unit 12A. The drive current I _A is obtained. Further, in the second period, the light detection intensity of the detection light L2b at the photodetector 30 and the light reception intensity of the reference light Lr at the photodetector 30 are equal to the second detection light source unit 12B. The drive current I _B is obtained. Then, the ratio or difference between the drive current I _A for the first detection light source unit 12A and the drive current I _B for the second detection light source unit 12B is obtained, and the first or second difference in the X-axis direction is obtained using the ratio or difference. It is detected at which position between the detection light source unit 12A and the second detection light source unit 12B the target object Ob exists.

The above detection principle can be mathematically explained using an optical path function as follows. First, it emitted the parameters from the following T = reflectivity of the target object Ob A _t = the first detection light source unit 12A
A distance function in which the detection light L2 is reflected by the target object Ob and reaches the light detector 30 A = first detection light source unit 12A in a state where the target object Ob exists in the detection target space 10R
Received light intensity of the light detector 30 when is turned on B _t = emitted from the second light source unit 12B for detection
A distance function in which the detection light L2 is reflected by the target object Ob and reaches the light detector 30 B = the second detection light source unit 12B in a state where the target object Ob exists in the detection target space 10R
The light reception intensity R _s of the light detector 30 when is turned on R _s = the optical path coefficient from the reference light source 12R to the light detector 30 R = the light reception intensity of the light detector 30 when only the reference light source 12R is turned on . Note that the light emission intensity of the first detection light source unit 12A, the second detection light source unit 12B, and the reference light source 12R is represented by the product of the drive current and the light emission coefficient. And In the above-described differential, the driving current for the first detection light source unit 12A when the received light intensity at the photodetector 30 is equal is I _A, and the driving current for the second detection light source unit 12B is I _B And the drive current for the reference light source 12R is I _R. In addition, regarding the light receiving intensity of the photodetector 30 when only the reference light source 12R is turned on during differential, the difference between the differential with the first detection light source unit 12A and the second detection light source unit 12B. Are assumed to be the same.

When the above-described differential is performed in a state where the target object Ob exists in the detection target space 10R,
A = T × A _t × I _A + Ambient Light ・ ・ Formula (1)
B = T × B _t × I _B + Ambient Light ・ ・ Formula (2)
R = R _s × I _R + Ambient Light ・ ・ Formula (3)
The relationship is obtained.

Here, since the received light intensity of the photodetector 30 at the time of the differential is equal, from the formulas (1) and (3), the following formula T × A _t × I _A + ambient light = R _s × I _R + ambient light T × A _t × I _A = R _s × I _R
T × A _t = R _s × I _R / I _A ... (4)
From the formulas (2) and (3), the following formula T × B _t × I _B + environment light = R _s × I _R + environment light T × B _t × I _B = R _s × I _R
T × B _t = R _s × I _R / I _B ... (5)
Is guided.

Further, the ratio P _AB of the distance functions A _t and B _t is expressed by the following equation: P _AB = A _t / B _t.
From the formulas (4) and (5), the ratio P _{AB of the} distance function is P _AB = I _B / I _A ··· Formula (7)
It is expressed as In the equation (7), there is no term of ambient light and no term of reflectance of the target object Ob. Therefore, the ambient light and the reflectance of the target object Ob do not affect the ratio P _AB of the distance functions A _t and B _t . In addition, about said mathematical model, you may correct | amend in order to cancel the influence etc. of the detection light L2 which entered without reflecting with the target object Ob. Further, in the differential with the first detection light source unit 12A and the differential with the second detection light source unit 12B, the received light intensity of the photodetector 30 when only the reference light source 12R is turned on is different. Even if it is set, basically the same principle holds.

Here, the light source used in the detection light source unit 12 is a point light source, and the light intensity at a certain point is inversely proportional to the square of the distance from the light source. Therefore, the ratio of the separation distance P1 between the first detection light source unit 12A and the target object Ob and the separation distance P2 between the second detection light source unit 12B and the target object Ob is expressed by the following equation: P _AC = (P1) ² : (P2) ²
Is required. Therefore, the target object Ob may exist on a contour line passing through a position obtained by dividing the virtual line connecting the first detection light source unit 12A and the second detection light source unit 12B by P1: P2. Recognize.

(Detection principle of Y coordinate information and determination of XY coordinates)
Next, the principle of detecting information related to the Y coordinate of the target object Ob will be described. In the present embodiment, information related to the Y coordinate of the target object Ob is detected using the same differential as that used when obtaining the X coordinate information. That is, Y coordinate information is obtained based on a result obtained by differentiating the first detection light source unit 12A, the second detection light source unit 12B, and the reference light source 12R. More specifically, when both the first detection light source unit 12A and the second detection light source unit 12B are turned on in a state where the target object Ob exists in the detection target space 10R, the Y-axis direction of the target object Ob And the received light intensity of the detection light L2a at the photodetector 30 have a monotonously changing relationship. Therefore, at least one of the drive current for the first detection light source unit 12A and the second detection light source unit 12B and the drive current for the reference light source 12R is adjusted, and the light receiving intensity of the detection light L2a at the photodetector 30 is adjusted. And the received light intensity of the reference light Lr at the photodetector 30 are matched. In such a differential, the first detection light source unit 12A at the time when the received light intensity of the detection lights L2a and L2b at the photodetector 30 is equal to the received light intensity of the reference light Lr at the photodetector 30. If the difference or ratio between the drive current for the second detection light source unit 12B and the drive current for the reference light source 12R is obtained, Y coordinate information indicating where the target object Ob exists in the Y-axis direction is obtained. Obtainable. Note that the first detection light source unit 12A and the second detection light source unit 12B are sequentially turned on, and the received light intensity of the detection light L2a at the photodetector 30 and the received light intensity of the reference light Lr at the photodetector 30. Even if the value obtained by combining the drive currents for the first detection light source unit 12A and the second detection light source unit 12B at the time of matching is used, it indicates which position in the Y-axis direction the target object Ob exists Y coordinate information can be obtained.

  Therefore, the X coordinate and Y coordinate of the target object Ob can be determined by using the X coordinate information and the Y coordinate information obtained by the method described above. More specifically, if the intersection of the line corresponding to the X coordinate information and the line corresponding to the Y coordinate information is obtained, the X coordinate and the Y coordinate of the target object Ob can be determined. Note that the concept of intersection points geometrically describes the position of the target object Ob, and actually the X and Y coordinates of the target object Ob are calculated by calculation.

(Layout of light source unit 12 for detection and photodetector 30)
FIG. 3 is an explanatory diagram schematically showing a positional relationship among the detection target space 10R, the detection light source unit 12, and the photodetector 30 in the optical position detection device 10 according to Embodiment 1 of the present invention. (A) is explanatory drawing of the layout in Embodiment 1 of this invention, FIG.3 (b) is explanatory drawing of the layout in the reference example with respect to Embodiment 1 of this invention.

  As shown in FIG. 3A, in the optical position detection device 10 of this embodiment, the first detection light source unit 12A and the second detection light source unit 12B are separated in the X-axis direction and in the Y-axis direction. In the same position. More specifically, the first detection light source unit 12A is separated from the end of the detection target space 10R by a separation distance dy1 toward one side Y1 (second direction) in the Y-axis direction. It is separated from the end of the detection target space 10R by a separation distance dx1 toward one side X1 (first direction) in the X-axis direction. The second detection light source unit 12B is separated from the end of the detection target space 10R by a separation distance dy1 toward one side Y1 (second direction) in the Y-axis direction, and the detection target space 10R. Are separated from each other by a separation distance dx1 toward the other side X2 in the X-axis direction (the direction opposite to the first direction). Accordingly, the first detection light source unit 12A and the second detection light source unit 12B are arranged symmetrically around the detection target space 10R in the X-axis direction.

  The photodetector 30 is disposed at an intermediate position between the first detection light source unit 12A and the second detection light source unit 12B in the X-axis direction, and the first detection light source unit 12A and the second detection light source. The portions 12B are separated from each other by an equal distance in the X-axis direction. Accordingly, the first detection light source unit 12A and the second detection light source unit 12B are arranged symmetrically about the photodetector 30 in the X-axis direction. Further, the photodetector 30 is in the same position as the first detection light source unit 12A and the second detection light source unit 12B in the Y-axis direction, and is Y from the detection target space 10R to the end of the detection target space 10R. It is spaced apart with a separation distance dy1 toward one side Y1 (second direction) in the axial direction.

  According to such a layout, as described below, the first detection light source unit 12A and the second detection light source unit 12B move from the detection target space 10R toward the one side X1 and the other side X2 in the X-axis direction. Since they are separated from each other, the detection target space 10R can be set wide in the X-axis direction. This operation will be described by taking the detection light L2b emitted from the second detection light source unit 12B as an example. In the reference example shown in FIG. 3B, the first detection light source unit 12A and the second detection light source unit 12B are arranged at positions that overlap the end of the detection target space 10R in the X axis direction in the X axis direction. Has been.

  In the reference example shown in FIG. 3B, even when the target object Ob is inside the detection target space 10R in the X-axis direction, the target object Ob is in the X-axis direction and the second detection light source unit 12B and the photodetector 30. , The incident angle Θ1 of the detection light L2b to the target object Ob is equal to the emission angle Θ2 of the reflected light L3 from the target object Ob, and the reflected light L3 specularly reflected by the target object Ob is the light. The light enters the detector 30. Therefore, when the target object Ob is at an intermediate position between the second detection light source unit 12B and the photodetector 30 in the X-axis direction, the position of the target object Ob becomes a singular point at the time of position detection. The position detection accuracy of the target object Ob is low. For this reason, in the reference example shown in FIG. 3B, the intermediate position between the second detection light source unit 12B and the photodetector 30 in the X-axis direction, and the first detection light source unit 12A and the light detection in the X-axis direction. Only the region 10R1 sandwiched by the intermediate position with the container 30 can be used as an effective region as the detection target space 10R.

  On the other hand, in the first embodiment shown in FIG. 3A, the incident angle Θ11 of the detection light L2b to the target object Ob is equal to the emission angle Θ12 of the reflected light L3 from the target object Ob. The detection light L2b specularly reflected by the target object Ob is incident on the photodetector 30 because the target object Ob is the other side X2 in the X axis direction in the detection target space 10R and the other side in the Y axis direction. When it is located on the side. Therefore, when the target object Ob is at another position in the detection target space 10R, the detection light L2b specularly reflected by the target object Ob does not enter the photodetector 30. Therefore, in the first embodiment shown in FIG. 3A, the entire region in the X-axis direction of the detection target space 10R can be used as an effective region, and compared with the reference example shown in FIG. There is an advantage that the detection target space 10R effective in the direction is wide.

(Main effects of this form)
As described above, in the optical position detection device 10 of the present embodiment, the first detection light source unit 12A and the second detection light source unit 12B are detected light L2a from one side Y1 to the other side Y2 in the Y direction. A part of the detection lights L2a and L2b that are emitted from L2b and reflected by the target object Ob located in the detection target space 10R from which the detection lights L2a and L2b are emitted are received by the photodetector 30. Here, the first detection light source unit 12A and the second detection light source unit 12B are separated in the X-axis direction. For this reason, the light reception intensity at the photodetector 30 when the first detection light source section 12A is turned on, the light reception intensity at the light detector 30 when the second detection light source section 12B is turned on, and the light detection section If the ratio or difference between the current values after adjusting the current values supplied to the first detection light source unit 12A and the second detection light source unit 12B so that the received light intensity becomes equal, the first detection light source unit The ratio between the distance in the X-axis direction from 12A to the target object Ob and the distance in the X-axis direction from the second detection light source unit 12B to the target object Ob is known.

  The first detection light source unit 12A and the second detection light source unit 12B are disposed at the same position in the Y-axis direction. Therefore, the first detection light source unit 12A and the second detection light source unit 12A and the second detection light source unit 12A and the second detection light source unit 12B are set so that the received light intensity at the photodetector 30 when the first detection light source unit 12A and the second detection light source unit 12B are simultaneously turned on. The position of the target object Ob in the Y-axis direction can be determined from the sum of the current values when the detection light source unit 12B is driven.

  Therefore, the X coordinate (first position) and Y of the target object Ob can be obtained only by using two detection light source units (the first detection light source unit 12A and the second detection light source unit 12B) as the detection light source unit 12. Coordinates (second position) can be detected.

  In this embodiment, when detecting the Y coordinate, the light reception intensity at the photodetector 30 when the first detection light source unit 12A and the second detection light source unit 12B are simultaneously turned on becomes a predetermined value. The sum of the current values when the first detection light source unit 12A and the second detection light source unit 12B are driven is used. Therefore, even when the target object Ob is separated from the first detection light source unit 12A and the second detection light source unit 12B, the position of the target object Ob in the Y-axis direction can be detected, and the detection range of the Y coordinate is wide. .

  In this embodiment, the first detection light source unit 12A and the second detection light source unit 12B are separated from the detection target space 10R in the X-axis direction. For this reason, as described with reference to FIGS. 3A and 3B, the first detection light source unit A and the second detection light source unit 12B are separated from the detection target space 10R in the X-axis direction. The specific position of the target object Ob is such that the detection light L2 emitted from the first detection light source unit 12A and the second detection light source unit 12B is regularly reflected and enters the light detection unit. , It can be shifted more outward in the X-axis direction. Therefore, even when the position of the target object Ob is detected by a small number of light source units such as the first detection light source unit 12A and the second detection light source unit 12B, the detection target space 10R can be set wide in the X-axis direction. it can.

  Further, in the present embodiment, the first detection light source unit 12A and the second detection light source unit 12B are arranged symmetrically in the X-axis direction with the photodetector 30 and the detection target space 10R as the center, so that the detection target The detection accuracy in the space 10R can be made symmetric in the X-axis direction.

  In this embodiment, the reference light source 12R that emits the reference light incident on the light detection unit without passing through the emission space (detection target space 10R) of the detection lights L2a and L2b is provided. The position of the target object Ob is detected based on the result obtained by differentiating the detection light source unit 12 and the reference light source 12R based on the light reception result of the device 30. For this reason, the Y coordinate of the target object Ob can be detected without being affected by the ambient light.

  Moreover, since the detection light L2 (detection light L2a, L2b) is infrared light, the detection light L2 is not visually recognized. Therefore, even when the optical position detection device 10 is provided in the display device, the optical position detection device 10 can be used for various devices, such as not hindering the display.

  Further, the detection light source unit 12 (the first detection light source unit 12 </ b> A and the second detection light source unit 12 </ b> B) and the photodetector 30 are integrated as an optical unit 18. For this reason, there exists an advantage that the optical position detection apparatus 10 can be easily added to various apparatuses.

[Embodiment 2]
FIG. 4 is an explanatory view schematically showing the main part of the device with a position detection function according to the second embodiment of the present invention. FIGS. 4 (a) and 4 (b) show the detection light source unit of the detection light. It is explanatory drawing when it sees from the output space side, and explanatory drawing when the light source part for a detection is seen from the side. FIG. 5 is an explanatory diagram showing the configuration of the light source device and the like of the optical position detection device used in the device with a position detection function according to the second embodiment of the present invention, and the detection light source unit from the detection light emission space. It is a top view when seen. FIG. 6 is an explanatory diagram schematically showing the positional relationship among the detection target space 10R, the detection light source unit 12, and the photodetector 30 in the optical position detection device 10 according to Embodiment 1 of the present invention. (A) is explanatory drawing of the layout in Embodiment 2 of this invention, FIG.6 (b) is explanatory drawing of the layout in Embodiment 1 of this invention. Since the basic configuration of the present embodiment is substantially the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 4 (a), 4 (b), and 5, the device 1 with a position detection function of this embodiment is also a viewing surface constituent member having a viewing surface 41 on which information is visually recognized, as in the first embodiment. 40 and an optical position detector 10 that detects the position of the target object Ob located on the viewing surface 41 side (one side Z1 in the Z-axis direction) with respect to the viewing surface component member 40, and an electronic blackboard It can be used as a screen device with a position detection function for use, a screen device with a position detection function for a projection display device, or the like.

  In the optical position detection device 10 having such a configuration, in this embodiment, the layout of the light source unit for detection 12 and the photodetector 30 is described below with reference to FIGS. 4, 5, and 6A. It has become.

  First, in the optical position detection device 10 of the present embodiment, the first detection light source unit 12A and the second detection light source unit 12B are separated in the X-axis direction and are in the same position in the Y-axis direction. More specifically, the first detection light source unit 12A is separated from the end of the detection target space 10R by a separation distance dy1 toward one side Y1 (second direction) in the Y-axis direction. It is separated from the end of the detection target space 10R by a separation distance dx2 (dx2 <dx1) toward one side X1 (first direction) in the X-axis direction. The second detection light source unit 12B is separated from the end of the detection target space 10R by a separation distance dy1 toward one side Y1 (second direction) in the Y-axis direction, and the detection target space 10R. Are separated from each other by a separation distance dx2 (dx2 <dx1) toward the other side X2 in the X-axis direction (a direction opposite to the first direction). Accordingly, the first detection light source unit 12A and the second detection light source unit 12B are arranged symmetrically around the detection target space 10R in the X-axis direction.

  The photodetector 30 is disposed at an intermediate position between the first detection light source unit 12A and the second detection light source unit 12B in the X-axis direction, and the first detection light source unit 12A and the second detection light source. The portions 12B are separated from each other by an equal distance in the X-axis direction. Accordingly, the first detection light source unit 12A and the second detection light source unit 12B are arranged symmetrically about the photodetector 30 in the X-axis direction.

  In this embodiment, unlike Embodiment 1, the photodetector 30 is located farther from the detection target space 10R than the first detection light source unit 12A and the second detection light source unit 12B in the Y-axis direction. It is separated from the end of the detection target space 10R by a separation distance dy2 (dy1 <dy2) toward one side Y1 (second direction) in the Y-axis direction. Therefore, in this embodiment, the wiring material 15 bent at a plurality of places or the wiring material 15 connecting a plurality of members is used.

  According to such a layout, as described below, the first detection light source unit 12A and the second detection light source unit 12B move from the detection target space 10R toward the one side X1 and the other side X2 in the X-axis direction. Since they are separated from each other, the detection target space 10R can be set wide in the X-axis direction. Furthermore, since the photodetector 30 is located farther from the detection target space 10R than the first detection light source unit 12A and the second detection light source unit 12B in the Y-axis direction, the photodetector 30 in the X-axis direction of the detection target space 10R. When the size is set to the same size as in the first embodiment, the separation distance dx2 between the first detection light source unit 12A and the detection target space 10R and the separation between the second detection light source unit 12B and the detection target space 10R. The distance dx2 can be narrower than the separation distance dx1 in the first embodiment.

  More specifically, in the first embodiment shown in FIG. 6B, the incident angle Θ11 of the detection light L2b to the target object Ob is equal to the emission angle Θ12 of the reflected light L3 from the target object Ob. In order to avoid the detection light L2b specularly reflected by the target object Ob from entering the photodetector 30, the separation distance between the first detection light source unit 12A and the detection target space 10R, and the second detection The separation distance between the light source unit 12B and the detection target space 10R needs to be set to the separation distance dx1. However, in this embodiment, the photodetector 30 is located farther from the detection target space 10R than the first detection light source unit 12A and the second detection light source unit 12B in the Y-axis direction. For this reason, the incident angle Θ21 of the detection light L2b to the target object Ob is equal to the emission angle Θ22 of the reflected light L3 from the target object Ob, and the detection light L2b regularly reflected by the target object Ob is detected by the photodetector 30. In order to avoid incident on the first detection light source section 12A and the detection target space 10R, and the second detection light source section 12B and the detection target space 10R are separated by a separation distance dx2. (Dx2 <dx1) may be set.

  Therefore, according to the present embodiment, even when the position of the target object Ob is detected by a small number of light source units such as the first detection light source unit 12A and the second detection light source unit 12B, the detection target space 10R is moved in the X-axis direction. And the distance dx2 between the first detection light source unit 12A and the detection target space 10R, and the second detection light source unit 12B and the detection target space, as compared with the first embodiment. The separation distance dx2 from 10R may be narrow. Therefore, there is an advantage that the dimension of the optical position detection device 10 in the X-axis direction can be shortened.

  In the present embodiment, the separation distance between the first detection light source unit 12A and the detection target space 10R and the separation distance between the second detection light source unit 12B and the detection target space 10R are separated as in the first embodiment. Setting the distance dx1 has an advantage that the effective detection target space 10R can be expanded in the X-axis direction as compared with the first embodiment.

[Other embodiments]
In the above embodiment, the light source unit for detection 12 and the light detector 30 are unitized. However, in this embodiment, the light source for detection 12 and the light detector 30 are separated from each other. The unit 12 and the photodetector 30 may be arranged separately without being unitized.

[Configuration of equipment with position detection function]
The optical position detection device 10 described with reference to FIGS. 1 to 6 is, for example, a screen device with a position detection function if a screen of a projection display device or a screen of an electronic blackboard is used as the viewing surface constituent member 40. A device with a position detection function) can be configured. Further, if a direct-view display device is used as the viewing surface constituent member 40, a direct-view display device with a position detection function (device with a position detection function) can be configured. Further, if digital signage is used as the viewing surface constituting member 40, a digital signage with position detection function (apparatus with position detection function) can be configured. Furthermore, the optical position detection device 10 described with reference to FIGS. 1 to 6 can be used to configure the device with a position detection function shown in FIGS.

(Specific example 1 of the device 1 with a position detection function)
With reference to FIG. 7, the example which comprised the apparatus 1 with a position detection function to which this invention was applied as a projection type display apparatus using a screen as the visual recognition surface structural member 40 is demonstrated. FIG. 7 is an explanatory diagram of a specific example 1 (a projection display device with a position detection function) of the device 1 with a position detection function to which the present invention is applied. In addition, in the apparatus 1 with a position detection function of this form, since the structure of the optical position detection apparatus 10 is the same as the structure demonstrated with reference to FIGS. 1-6, the same code | symbol is used about a common part. It attaches and shows, The description is abbreviate | omitted.

  The position detection function-equipped device 1 shown in FIG. 7 is a position at which an image is projected onto the screen 80 (viewing surface constituent member 40) from an image projection device 250 (image generation device) called a liquid crystal projector or a digital micromirror device. This is a projection display device 200 with a detection function. In the projection display apparatus 200 with a position detection function, the image projection apparatus 250 enlarges and projects the image display light Pi from the projection lens system 210 provided in the housing 240 toward the screen 80. Here, the image projection device 250 projects the image display light Pi toward the screen 80 from a direction slightly inclined with respect to the Y-axis direction. Therefore, the screen surface 80a on which an image is projected on the screen 80 constitutes a viewing surface 41 on which information is visually recognized.

  In the projection display device 200 with a position detection function, the optical position detection device 10 (optical unit 18) is configured integrally with the image projection device 250. Therefore, the optical position detection device 10 emits the detection light L2 along the screen surface 80a and detects the reflected light L3 reflected by the target object Ob. For this reason, if the target object Ob such as a fingertip is brought close to a part of the image projected on the screen 80, the position of the target object Ob can be detected. Etc. can be used as input information.

(Specific example 2 of the device 1 with a position detection function)
Referring to FIG. 8, device 1 with a position detection function is configured as a window with a position detection function by using a translucent member that covers exhibits as information as viewing surface component member 40 of device 1 with a position detection function. An example will be described. FIG. 8 is an explanatory diagram of a specific example 2 (a window with a position detection function) of the device 1 with a position detection function to which the present invention is applied, and FIGS. 8A and 8B show the window with a position detection function outside. It is explanatory drawing which shows a mode seen from the (viewing surface side), and explanatory drawing which shows the cross section typically. In addition, in the apparatus 1 with a position detection function (window with a position detection function) of this form, since the structure of the optical position detection apparatus 10 is the same as the structure demonstrated with reference to FIGS. 1-6, it is common. Parts are denoted by the same reference numerals, and description thereof is omitted.

  A window 400 with position detection function (device 1 with position detection function) shown in FIGS. 8A and 8B includes a translucent member 440 (viewing surface constituent member 40) that covers an exhibit 450 as information. The viewing surface (viewing surface 41) of the exhibit 450 is constituted by the outer surface 441 of the translucent member 440. In the window 400 with a position detection function, the exhibit 450 is held by an actuator (not shown) that causes the exhibit 450 to perform operations such as advancing and turning.

  The window 400 with a position detection function includes the optical position detection device 10 described with reference to FIGS. 1 to 6 on the outer surface 441 side of the translucent member 440. The optical position detection device 10 emits the detection light L2 along the outer surface 441 (viewing surface 41) of the translucent member 440, and detects the light reflected by the target object Ob. Therefore, the detection target space 10 </ b> R of the optical position detection device 10 is set on the outer surface 441 side of the translucent member 440. Therefore, if a target object Ob such as a fingertip enters the detection target space 10R, the position of the target object Ob can be used as input information such as an instruction to switch the direction of the exhibit 450. For example, if the position of the target object Ob such as a fingertip is shifted downward (the other side Y2 in the Y-axis direction), the exhibit 450 is moved closer to the translucent member 440 and the position of the target object Ob such as the fingertip is moved to the right side ( By shifting to one side X1) in the X-axis direction, the orientation of the exhibit 450 can be changed, for example, the exhibit 450 can be turned clockwise.

(Specific example 3 of the device 1 with a position detection function)
Referring to FIG. 9, as the viewing surface constituting member 40 of the device 1 with a position detection function, a base that supports game media in an amusement device such as a pachinko machine is used, and the amusement device is configured as an amusement device with a position detection function. An example will be described. FIG. 9 is an explanatory diagram of a specific example 3 (amusement device with position detection function) of the device 1 with position detection function to which the present invention is applied, and FIGS. 9A and 9B are amusement devices with position detection function. It is explanatory drawing which shows a mode that it looked at from the front (viewing surface side), and explanatory drawing which shows the cross section typically. In addition, in the apparatus 1 with a position detection function (amusement apparatus with a position detection function) of this embodiment, the configuration of the optical position detection device 10 is the same as the configuration described with reference to FIGS. The same reference numerals are assigned to the parts to be described, and the description thereof is omitted.

  An amusement device 500 with position detection function (device 1 with position detection function) shown in FIGS. 9A and 9B is a plate-like base 520 (viewing surface constituent member 40) that supports a game medium 501 such as a pachinko ball. An outer frame 510 for holding the base 520, a handle 570 for setting a position for sending the game medium 501 onto the base 520, a tray 560 for receiving the game medium 501, and the like. The surface 521 (viewing surface 41) of the base 520 is covered with a glass plate 530. On the surface 521 of the base 520, the guide rail 525 with respect to the game medium 501 and the movement of the game medium 501 are inside the glass plate 530. Are provided, nails 528 for changing the game, winning openings 580, 590, and the like. In addition, on the surface 521 of the base 520, a liquid crystal device 540 that displays a result of a lottery performed each time the game medium 501 enters the winning opening 580 is provided inside the glass plate 530.

  In such an amusement device 500 with a position detection function, the optical position detection device 10 described with reference to FIGS. 1 to 6 is provided on the upper end side of the outer surface 531 of the glass plate 530, and such optical position detection is performed. The apparatus 10 emits the detection light L2 along the outer surface 531 of the glass plate 530 and the surface 521 (viewing surface 41) of the base 520, and detects the light reflected by the target object Ob. Therefore, the detection target space 10 </ b> R of the optical position detection device 10 is set on the outer surface 441 side of the glass plate 530. Therefore, if the player brings the target object Ob such as a fingertip close to the detection target space 10R in accordance with the content displayed on the liquid crystal device 540 or the game, the position of the target object Ob is changed to the liquid crystal device 540. It can be used as input information such as an instruction to switch the contents displayed in.

1 .... Equipment with position detection function, 10 .... Optical position detection device, 10R ... Space to be detected, 11. Light source device, 12 .... Light source unit for detection, 12A ... Light source unit for first detection, 12B ... Second light source for detection, 12R ... Light source for reference, 30 ... Light detector, 40 ... Viewing surface component, 41 ... Viewing surface, 50 ... Position detector, 52 ... XY coordinates Detection unit, 200 ... Projection type display device with position detection function (equipment with position detection function), 400 ... Window with position detection function (equipment with position detection function), 500 ... Amusement apparatus with position detection function (position detection) Equipment with function), Ob ...

Claims (7)

An optical position detection device that optically detects a position of at least a first direction of a target object in a detection target space,
A first light source section for emitting detection light toward the detection target space at a position separated from the detection target space in a second direction intersecting the first direction and in the first direction;
A second light source unit for detection that emits detection light toward the detection target space at a position separated from the detection target space in a direction opposite to the first direction and in the second direction;
The target object located between the first detection light source unit and the second detection light source unit in the first direction and spaced from the detection target space in the second direction. A light detection unit that receives the detection light reflected by
A light source driving unit for driving the first detection light source unit and the second detection light source unit;
The position of the elephant object in the first direction is detected based on a light reception result of the light detection unit when the light source driving unit sequentially turns on the first detection light source unit and the second detection light source unit. A position detector;
An optical position detection device characterized by comprising:   2. The optical position detection according to claim 1, wherein the light detection unit is provided at a position spaced apart from the first detection light source unit and the second detection light source unit in the second direction. apparatus.   The first light source unit for detection is arranged symmetrically with the second light source unit for detection with the light detection unit and the detection target space as a center in the first direction. An optical position detection apparatus according to 1.   The position detection unit includes a light reception result of the light detection unit when the light source driving unit lights the first detection light source unit and the second detection light source unit simultaneously, or the light source driving unit is the first light source driving unit. The position of the target object in the second direction is detected based on a result of combining light reception results of the light detection unit when the detection light source unit and the second detection light source unit are sequentially turned on. The optical position detection device according to any one of claims 1 to 3. A reference light source that emits reference light incident on the light detection unit without going through the detection light emission space;
The position detection unit is configured to make a difference between the first detection light source unit and the reference light source based on a light reception result of the light detection unit, and the second detection light source unit and the reference light source. 5. The optical position detection device according to claim 1, wherein the position of the target object is detected based on a result obtained by differentiating the position of the target object. 6.   The optical position detection apparatus according to claim 1, wherein the detection light is infrared light. A device with a position detection function comprising the optical position detection device according to any one of claims 1 to 6,
A device with a position detection function, comprising a viewing surface constituent member having a viewing surface along the first direction and the second direction.

Images