JP2012194127A - Optical position detector and input function equipped-display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical position detector that is capable of optically detecting a three-dimensional position of a target object in a wide range, and an input function-equipped display system.SOLUTION: In an optical position detector 10, when a light source section 12 emits detection light L2 along a X-Y plane in a radial pattern, a first light receiving section 13 receives the detection light L2 which is reflected by a target object Ob located in a detection target space 10R, and detects X-Y coordinate data of the target object Ob based on the light receiving intensity at the first light receiving section 13. A second light receiving section 14 is provided in a position which is separated from the first light receiving section 13 in a Z-axis direction, and receives the detection light L2 reflected by the target object Ob. At this time, since comparison results such as difference and ratio between the light receiving intensities at the first light receiving section 13 and the second light receiving section 14 are varied depending on the position of the target object Ob in the Z-axis direction, the position of the target object Ob in the z-axis direction is detected based on the comparison results.

Description

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

  As an optical position detection device that optically detects a target object, for example, a plurality of light source units and light receiving units that are point light sources are provided at positions separated from each other, and a light transmitting member is provided from each of the plurality of light source units. When detection light is emitted toward a target object, the detection light reflected by the target object is transmitted through a translucent member and detected by a light receiving unit (see Patent Document 1). In such an optical position detection device, the position of the target object is detected by utilizing the fact that the received light intensity at the light receiving unit changes depending on the distance from the light source through the target object to the light receiving unit.

  Further, the light intensity whose intensity changes in the in-plane direction of the light guide plate to one surface side with respect to the light guide plate by emitting the detection light emitted from each of the plurality of light source units including the point light source through the light guide plate. There has also been proposed an optical position detection device that forms a distribution and detects detection light reflected by a target object located in a space in which such a light intensity distribution is formed by a light receiving unit (see Patent Documents 2 and 3). . In such an optical position detection apparatus, the position of the target object in the in-plane direction of the light guide plate is detected by utilizing the fact that the amount of reflected light at the target object changes depending on the position of the target object.

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

  However, the optical position detection devices described in Patent Documents 1, 2, and 3 have a problem that the range in which the position of the target object can be detected is narrow. That is, in the optical position detection device described in Patent Document 1, since the detection light emitted from the point light source is used, the detection light emission angle range itself is narrow, and the range in which the position of the target object can be detected is narrow. Moreover, in the optical position detection devices described in Patent Documents 2 and 3, it is necessary to enlarge the light guide plate in order to expand the space in which the position of the target object can be detected. When using such a large light guide plate, Attenuation when the detection light propagates inside the light guide plate is large. For this reason, it is difficult to form a predetermined light intensity distribution with a sufficient intensity level over a wide range, and the range in which the position of the target object can be detected is narrow.

  Further, in the optical position detection device described in Patent Document 1, when it is attempted to detect the three-dimensional position of the target object, a plurality of light source units composed of point light sources are three-dimensionally arranged. Since the emission angle range of the detection light emitted from the light source unit itself is narrow, the range in which the position of the target object can be detected becomes extremely narrow. In addition, when trying to detect the three-dimensional position of the target object in the optical position detection devices described in Patent Documents 2 and 3, it is necessary to form an intensity distribution that changes in the normal direction with respect to the light guide plate. It is difficult to form the distribution with a large light guide plate. Therefore, the range in which the position of the target object can be detected is extremely narrow.

  In view of the above problems, an object of the present invention includes an optical position detection device capable of optically detecting a three-dimensional position of a target object over a wide range, and such an optical position detection device. It is to provide a display system with an input function.

  In order to solve the above problems, an optical position detection device according to the present invention includes a first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction. A light source portion that emits detection light radially along a virtual plane defined by the first direction and the second direction, and a detection light emission space where the detection light is emitted from the light source portion. A first light-receiving unit that receives the detection light reflected by the target object positioned; and the detection that is separated from the first light-receiving unit in the third direction and reflected by the target object located in the detection light emission space. A position of the target object in the first direction and the second direction is detected on the basis of a second light receiving unit that receives light and at least light reception intensity in the first light receiving unit, and light reception by the first light receiving unit The ratio between the intensity and the received light intensity at the second light receiving part A position detector for detecting a position of the target object in the third direction based on the result, characterized in that it has a.

  In the present invention, “detecting the position of the target object in the first direction and the second direction based on at least the received light intensity in the first light receiving unit” means that the first light receiving unit receives light. In addition to the configuration for detecting the position of the target object in the first direction and the second direction based on the intensity, based on the sum of the received light intensity at the first light receiving part and the received light intensity at the second light receiving part. This means that the position of the target object in the first direction and the second direction is detected.

  In the optical position detection device according to the present invention, the light source unit emits detection light radially along a virtual plane defined by the first direction and the second direction, and the first light receiving unit is The detection light reflected by the target object located in the detection light emission space (detection target space) is received. Therefore, the position detection unit can detect the position of the target object in the first direction and the second direction based on the received light intensity at the first light receiving unit. At this time, since the detection light emitted radially from the light source unit is used, the detection light can be emitted with sufficient intensity to the entire detection target space. Therefore, according to the present invention, the detection target space is wide. In the optical position detection device according to the present invention, the second light receiving unit is provided at a position separated in the third direction from the first light receiving unit, and the second light receiving unit also emits the detection light from the light source unit. The detection light reflected by the target object located in the space is received. At this time, a comparison result such as a difference or a ratio between the received light intensity at the first light receiving unit and the received light intensity at the second light receiving unit varies depending on the position of the target object in the third direction. Accordingly, the position detection unit detects the position of the target object in the third direction over the entire wide detection target space by using the comparison result between the light reception intensity at the first light reception unit and the light reception intensity at the second light reception unit. can do.

  In the present invention, the position detection unit is configured to compare the received light intensity at the first light receiving unit and the second light receiving unit as a comparison result between the received light intensity at the first light receiving unit and the received light intensity at the second light receiving unit. A configuration for detecting the position of the target object in the third direction can be employed based on the difference from the received light intensity at. As a result of comparison between the received light intensity at the first light receiving part and the received light intensity at the second light receiving part, if the difference between the received light intensity at the first light receiving part and the received light intensity at the second light receiving part is used, It is possible to simplify the circuit configuration and the like.

  In the present invention, in the light source unit, the emission intensity of the detection light decreases from one side to the other side of the emission angle range of the detection light during the first period, and the detection light is emitted during the second period. The intensity decreases from the other side of the emission angle range of the detection light toward the one side, and the position detection unit receives the light reception intensity of the first light receiving unit in the first period and the first light reception in the second period. Based on the comparison result with the received light intensity of the unit, a configuration can be adopted in which the angular position of the target object with respect to the light source unit is detected as the position of the target object in the first direction and the second direction. According to such a configuration, the light intensity distribution can be formed over a wide space, so that the detection target space is wide.

  In the present invention, the position detection unit is configured to compare the light receiving intensity of the first light receiving unit in the first period with the light receiving intensity of the first light receiving unit in the second period. The first driving current value for the light source unit in the first period and the light source in the second period when the light receiving intensity of one light receiving unit is equal to the light receiving intensity of the first light receiving unit in the second period A configuration for detecting the position of the target object based on a result of comparison with the second drive current value for the unit may be employed.

  In the present invention, it is preferable that the light source unit includes a first light source unit and a second light source unit provided at a position separated from the first light source unit in the first direction. According to such a configuration, from the position corresponding to the intersection of the angular position of the target object with respect to the first light source unit and the angular position of the target object with respect to the second light source unit, as the position in the first direction and the position in the second direction, Two-dimensional coordinate data (coordinate data in the first direction and coordinate data in the second direction) of the target object can be obtained.

  In the present invention, the first light receiving unit and the second light receiving unit may be configured to be provided between the first light source unit and the second light source unit in the first direction. According to this configuration, it is easy to accommodate the light source unit (the first light source unit and the second light source unit), the first light receiving unit, and the second light receiving unit in a common housing.

  In this case, it is preferable that the first light receiving portion and the second light receiving portion are provided at positions overlapping in the third direction. According to this configuration, the comparison result between the received light intensity at the first light receiving unit and the received light intensity at the second light receiving unit is affected only by the position of the target object in the third direction, and the first direction of the target object and There is an advantage that it is hardly affected by the position in the second direction.

  In the present invention, the first light receiving unit is located at a position overlapping with the radiation center position of the detection light in the first light source unit in the third direction, and at a radiation center position of the detection light in the second light source unit. On the other hand, the structure provided in each of the position which overlaps with the said 3rd direction is employable. According to such a configuration, it is convenient to unitize the first light source unit together with the first light receiving unit, and to unitize the second light source unit together with the first light receiving unit.

  In this case, the second light receiving unit may employ a configuration provided between the first light source unit and the second light source unit in the first direction. According to this configuration, it is easy to accommodate the light source unit (the first light source unit and the second light source unit), the first light receiving unit, and the second light receiving unit in a common housing.

  In addition, the second light receiving unit is located at a position overlapping the radiation center position of the detection light in the first light source unit in the third direction and the radiation center position of the detection light in the second light source unit. A configuration provided at each of the overlapping positions in the third direction can be employed. According to such a configuration, since two pairs of the first light receiving unit and the second light receiving unit are provided, two comparison results between the light receiving intensity at the first light receiving unit and the light receiving intensity at the second light receiving unit are obtained. Therefore, the position detection accuracy of the target object in the third direction can be increased. Since the first light receiving unit and the second light receiving unit overlap in the third direction, the comparison result between the light receiving intensity at the first light receiving unit and the light receiving intensity at the second light receiving unit is There is an advantage that it is influenced only by the position in the three directions and is not easily influenced by the position of the target object in the first direction and the second direction.

  The optical position detection apparatus according to the present invention can be used in various systems such as a display system with an input function. For example, a display device that displays an image, and an optical position detection device that detects the position of a target object on the side where the image is displayed with respect to the display device. In the display system with an input function in which an image displayed by the display device is switched based on the position detection result of the target object, the optical position detection device according to the present invention can be used. A display device that displays an image; and an optical position detection device that detects a position of a target object on the side where the image is displayed with respect to the display device. In the display system with an input function in which an image displayed by the display device is switched based on the position detection result of the target object, the optical position detection device according to the present invention can be used. Furthermore, as another system, it can be used for an input system for electronic paper, a window system with an input function, and an amusement system with an input function.

It is explanatory drawing which shows typically the principal part of the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing when the principal part of the optical position detection apparatus which concerns on Embodiment 1 of this invention is seen from the side. It is explanatory drawing of the light source part used for the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the principal part of the light source part shown in FIG. It is explanatory drawing which shows typically the detailed structure of the light source part shown in FIG. It is explanatory drawing which shows the electrical structure etc. of the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the principle which detects the angular position of a target object in the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the principle which acquires the XY coordinate data of a target object in the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the principle which detects the Z coordinate data of a target object in the optical position detection apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows typically the principal part of the optical position detection apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the light source part used for the optical position detection apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the structure of the principal part of the light source part shown in FIG. It is explanatory drawing which shows typically the principal part of the optical position detection apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing of the light source part used for the optical position detection apparatus which concerns on Embodiment 4 of this invention. It is explanatory drawing which shows the structure of the principal part of the light source part shown in FIG. It is explanatory drawing of the light source part used for the optical position detection apparatus which concerns on Embodiment 5 of this invention. It is explanatory drawing which shows typically the detailed structure of the light source part shown in FIG. It is explanatory drawing of the light source part used for the optical position detection apparatus which concerns on Embodiment 6 of this invention. It is explanatory drawing of the specific example 1 (display system with an input function) of the position detection system to which this invention is applied. It is explanatory drawing of the specific example 2 (display system with an input function / projection type display system with an input function) of the position detection system 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 (first direction) and the Y-axis direction (second direction), and the directions intersecting the X-axis direction and the Y-axis direction are defined as the Z-axis direction (third direction). Direction). 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.

[Embodiment 1]
(overall structure)
FIG. 1 is an explanatory view schematically showing the main part of an optical position detection apparatus according to Embodiment 1 of the present invention. FIGS. 1 (a) and 1 (b) show the detection light of the optical position detection apparatus. It is explanatory drawing when it sees from the diagonal direction by the side of radiation | emission space, and explanatory drawing when an optical position detection apparatus is seen from the front. FIG. 2 is an explanatory diagram when the main part of the optical position detection device according to the first embodiment of the present invention is viewed from the side.

  1 and 2, the position detection system 1 according to the present embodiment includes an optical position detection device 10 that detects the position of the target object Ob. The optical position detection device 10 includes the X-axis direction and the Y-direction. The position of the target object Ob is detected using the detection light L2 emitted radially along the virtual XY plane (virtual plane) defined by the axial direction. In this embodiment, the position detection system 1 includes a viewing surface constituent member 40 that includes a viewing surface 41 that extends along the XY plane on one side Z1 in the Z-axis direction. The detection light L2 is emitted along the surface 41, and 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 constituent member 40 is detected. Therefore, the detection target space 10R of the position detection system 1 is a detection light emission space from which the detection light L2 is emitted in the optical position detection device 10. The position detection system 1 can be used as a display system with an input function such as an electronic blackboard, which will be described later, or a projection display system with an input function, by the optical position detection device 10.

  In the position detection system 1 of this embodiment, the optical position detection device 10 includes a light source unit 12 (linear light source unit) that emits the detection light L2 radially along the viewing surface 41 (XY plane), and the detection light L2. And a first light receiving unit 13 that receives the detection light L2 (reflected light L3) reflected by the target object Ob located in the emission space (detection target space 10R).

  In the present embodiment, as the light source unit 12, two light source units 12 (the first light source unit 12A and the second light source unit 12A) that face the detection target space 10R at positions separated from the viewing surface constituent member 40 on one side Y1 in the Y-axis direction. The light source unit 12B) is used, and the first light source unit 12A and the second light source unit 12B are separated in the X-axis direction and are in the same position in the Y-axis direction. As will be described later, each of the light source units 12 (the first light source unit 12A and the second light source unit 12B) includes a light source composed of an LED (light emitting diode), and from infrared light having a peak wavelength of 840 to 1000 nm. The detection light L2 (detection light L2a, L2b) is emitted radially.

  The first light receiving unit 13 is disposed between the two light source units 12 (the first light source unit 12A and the second light source unit 12B) in the X-axis direction. In the present embodiment, the first light receiving unit 13 is configured with the X axis It arrange | positions in the intermediate position of the two light source parts 12 (1st light source part 12A and 2nd light source part 12B) in a direction. The first light receiving unit 13 is at the same position as the first light source unit 12A and the second light source unit 12B in the Y-axis direction, and is also at the same position as the first light source unit 12A and the second light source unit 12B in the Z-axis direction. It is in.

  Moreover, the optical position detection apparatus 10 has the 2nd light-receiving part 14 in the position spaced apart in the Z-axis direction with respect to the 1st light-receiving part 13, and the 2nd light-receiving part 14 is 1st in this form. It arrange | positions with respect to the light-receiving part 13 at the one side Z1 of a Z-axis direction. Similarly to the first light receiving unit 13, the second light receiving unit 14 also receives the detection light L2 (reflected light L3) reflected by the target object Ob located in the emission space (detection target space 10R) of the detection light L2. In this embodiment, the second light receiving unit 14 is disposed at a position overlapping the second light receiving unit 14 in the Z-axis direction. Accordingly, the first light receiving unit 13 and the second light receiving unit 14 are disposed at an intermediate position between the two light source units 12 (the first light source unit 12A and the second light source unit 12B) in the X-axis direction.

  Each of the first light receiving unit 13 and the second light receiving unit 14 includes a photodiode, a phototransistor, or the like as a light receiving element. In this embodiment, the first light receiving unit 13 and the second light receiving unit 14 have a sensitivity peak in the infrared region. A photodiode including

  In the optical position detection device 10 configured as described above, the two light source units 12 (the first light source unit 12A and the second light source unit 12B), the first light receiving unit 13 and the second light receiving unit 14 are located in the detection target space 10R. The housing 16 is housed in a common housing 16 having a translucent portion facing the housing 16, and the housing 16 is located at a position protruding from the viewing surface constituent member 40 to one side Z <b> 1 in the Z-axis direction. The two light source units 12 (the first light source unit 12A and the second light source unit 12B) operate in different periods. Therefore, when the detection light L2a is emitted from the first light source unit 12A, the first light receiving unit 13 and the second light receiving unit 14 detect the detection light L2a (reflected light L3) reflected by the target object Ob located in the detection target space 10R. ) Is received. When the detection light L2b is emitted from the second light source unit 12B in a period different from the operation, the first light receiving unit 13B and the second light receiving unit 14 are detected by the target object Ob positioned in the detection target space 10R. Light L2b (reflected light L3) is received.

(Specific configuration of the light source unit 12)
FIG. 3 is an explanatory diagram of the light source unit 12 used in the optical position detection device 10 according to the first embodiment of the present invention. FIG. 4 is an explanatory diagram illustrating a configuration of a main part of the light source unit 12 illustrated in FIG. 3. FIG. 5 is an explanatory diagram schematically illustrating a detailed configuration of the light source unit 12 illustrated in FIG. 4, and an explanatory diagram illustrating a state in which the detection light L2 is emitted during the first lighting operation (first period). It is explanatory drawing which shows a mode that the detection light L2 is radiate | emitted at the time of 2 lighting operation | movement (2nd period).

  As shown in FIG. 3, in the optical position detection device 10 of the present embodiment, each of the first light source unit 12A and the second light source unit 12B has a fan shape or a semicircular shape when viewed from the Z-axis direction. 150. The light source support member 150 has a structure in which a first light source support member 151 and a second light source support member 152 are stacked in the Z-axis direction, and each of the first light source support member 151 and the second light source support member 152 has a structure. The fan-shaped or semi-circular flanges 156a and 156b are provided. The portion sandwiched between the flange portions 156a and 156b is an emission portion from which the detection light L2 is emitted from the first light source portion 12A, and the flange portions 156a and 156b define the emission range of the detection light L2 in the Z-axis direction. Restricted. In the first light source part 12A, the central angle of the light source support member 150 is approximately 180 °, and the first light source part 12A is formed over an angle range of approximately 180 °. 12 A of 1st light source parts are provided with the 1st light source module 126 and the 2nd light source module 127 which were arrange | positioned and overlapped with the Z-axis direction as an emission part of the detection light L2.

  As shown in FIG. 4, in the first light source unit 12A, each of the first light source module 126 and the second light source module 127 includes a light source 120 including a light emitting element such as a light emitting diode, and an arc-shaped light guide LG. Yes. Similarly to the first light source unit 12A, both the first light source module 126 and the second light source module 127 include a light source 120 made of a light emitting element such as a light emitting diode, and an arc-shaped light guide LG. ing.

  More specifically, as shown in FIG. 5A, in the first light source unit 12A, the first light source module 126 is a first light source 120 made of a light emitting element such as a light emitting diode that emits infrared light. The light source 121 and the arc-shaped light guide LG are provided, and the first light source 121 is disposed at one end LG1 of the light guide LG. The first light source module 126 includes an arc-shaped irradiation direction setting unit LE including the optical sheet PS, the louver film LF, and the like along the arc-shaped outer peripheral surface LG3 of the light guide LG. An arcuate reflecting sheet RS is provided along the arcuate inner circumferential surface LG4. As shown in FIG. 5B, the second light source module 127 also includes a second light source 122 made of a light emitting element such as a light emitting diode that emits infrared light as the light source 120, similarly to the first light source module 126. In addition, an arc-shaped light guide LG is provided, and the second light source 122 is disposed at the other end LG2 of the light guide LG. Similarly to the first light source module 126, the second light source module 127 also has an arcuate irradiation direction setting unit LE provided with an optical sheet PS, a louver film LF, and the like along the arcuate outer circumferential surface LG3 of the light guide LG. And an arcuate reflection sheet RS is provided along the arcuate inner circumferential surface LG4 of the light guide LG. Note that at least one of the outer peripheral surface LG3 and the inner peripheral surface LG4 of the light guide LG is subjected to processing for adjusting the emission efficiency of the detection light L2 from the light guide LG. For example, it is possible to employ a method of printing reflective dots, a molding method of attaching irregularities by a stamper or injection, or a groove processing method. Since the second light source unit 12B has the same configuration as the first light source unit 12A, the description thereof is omitted.

(Configuration of position detector, etc.)
FIG. 6 is an explanatory diagram showing an electrical configuration and the like of the optical position detection device 10 according to the first embodiment of the present invention. In the optical position detection apparatus 10 of the present embodiment, the first light source unit 12A, the second light source unit 12B, the first light receiving unit 13 and the second light receiving unit 14 described with reference to FIGS. The control IC 70 is electrically connected to a control device 60 including a control unit 61. The control IC 70 includes a plurality of circuits that generate a reference clock, an A-phase reference pulse, a B-phase reference pulse, a timing control pulse, a synchronous clock, and the like, and a pulse generator 75a that generates a predetermined drive pulse based on the A-phase reference pulse. And a pulse generator 75b for generating a predetermined drive pulse based on the B-phase reference pulse. Further, the control IC 70 generates drive pulses generated by the pulse generator 75a and the pulse generator 75b from the first light source 121 of the first light source unit 12A, the second light source 122 of the first light source unit 12A, and the second light source unit 12B. The switch unit 76 controls which of the first light source 121 and the second light source 122 of the second light source unit 12B is applied, and the pulse generators 75a and 75b and the switch unit 76 are the light source driving unit 51. Is configured.

  Further, the control IC 70 generates a pulse based on the first received light amount measuring unit 73 including an amplifying unit for amplifying the detection result in the first light receiving unit 13 and the measurement result in the first received light amount measuring unit 73. The devices 75a and 75b are controlled and supplied to the light source 120 (first light source 121 and second light source 122) of the first light source unit 12A and the light source 120 (first light source 121 and second light source 122) of the second light source unit 12B. And an adjustment amount calculation unit 74 that adjusts the drive current value (first drive current value) of the drive pulse to be adjusted. The first received light amount measuring unit 73 and the adjustment amount calculating unit 74 have a partial function of the position detecting unit 50.

  Further, the control IC 70 includes a second received light amount measuring unit 77 including an amplifying unit that amplifies the detection result of the second light receiving unit 14, the received light intensity of the first light receiving unit 13, and the second received light unit 14. A received light intensity comparing section 78 for comparing the received light intensity with the received light intensity. The second received light amount measuring unit 77 and the received light intensity comparing unit 78 also have a part of the function of the position detecting unit 50. In this embodiment, the received light intensity comparing unit 78 compares the received light intensity at the first light receiving unit 13 with the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14. 14 is detected.

  The control device 60 has a coordinate data acquisition unit 55 that constitutes the position detection unit 50 together with the first received light amount measurement unit 73, the adjustment amount calculation unit 74, the second received light amount measurement unit 77, and the received light intensity comparison unit 78. . Therefore, the position detection unit 50 includes the first received light amount measurement unit 73, the adjustment amount calculation unit 74, the second received light amount measurement unit 77, the received light intensity comparison unit 78, and the coordinates of the control device 60 (personal computer). It is comprised by the data acquisition part 55. FIG.

  Here, the coordinate data acquisition unit 55 includes an XY coordinate data acquisition unit 556 that acquires the XY coordinates of the target object Ob, a Z coordinate data acquisition unit 552 that acquires the Z coordinates of the target object Ob, and an XY coordinate data acquisition unit 556. And an XYZ coordinate data acquisition unit 554 that acquires the XYZ coordinates of the target object Ob based on the XY coordinates acquired in step S1 and the Z coordinate data acquired by the Z coordinate data acquisition unit 552. Further, the XY coordinate data acquisition unit 556 includes a first angular position detection unit 557 that detects the angular position of the target object Ob with respect to the radiation center of the first light source unit 12A based on the driving result for the first light source unit 12A, And a second angular position detection unit 558 that detects the angular position of the target object Ob with respect to the radiation center of the second light source unit 12B based on the driving result for the two light source units 12B. Further, the XY coordinate data acquisition unit 556 is based on the angular position of the target object Ob obtained by the first angular position detection unit 557 and the angular position of the target object Ob obtained by the second angular position detection unit 558. An XY coordinate data determination unit 559 for determining XY coordinate data of the target object Ob is provided. The Z coordinate data acquisition unit 552 includes the XY coordinate data acquired by the XY coordinate data acquisition unit 556, the received light intensity at the first light receiving unit 13 and the received light at the second light receiving unit 14 obtained by the received light intensity comparison unit 78. A storage unit 552a in which the Z coordinate data of the target object Ob specified by the relationship with the comparison result (the difference between the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14) is stored. have. The Z coordinate data acquisition unit 552 includes the XY coordinate data acquired by the XY coordinate data acquisition unit 556, the received light intensity at the first light receiving unit 13 obtained by the received light intensity comparison unit 78, and the second light receiving unit 14. When the comparison result with the received light intensity is obtained, the contents stored in the storage unit 552a are used as a lookup table to acquire the Z coordinate data of the target object Ob.

  In this embodiment, the driving for the first light source unit 12A and the driving for the second light source unit 12B are performed by one control IC 70, but the first light source unit 12A and the second light source unit 12B are controlled separately. It may be driven by an IC.

(XY coordinate data detection principle)
As shown in FIG. 5, in the optical position detection device 10 of this embodiment, the light source driving unit 51 described with reference to FIG. 6 includes two light source units 12 (a first light source unit 12A and a second light source unit 12B). In either case, the first lighting operation in which the emission intensity of the detection light L2 decreases from one side to the other side of the emission angle range of the detection light L2, and the emission intensity of the detection light L2 is the emission angle range of the detection light L2. The second lighting operation that decreases from the other side to the one side is performed.

  More specifically, the light source driving unit 51 turns on the first light source 121 of the first light source module 126 and detects the first light source unit 12A during the first lighting operation (first period). The detection light L2 is emitted to the space 10R. At that time, the second light source 122 is in an extinguished state. As a result, the first light intensity distribution LID1 is formed in the detection target space 10R. The first light intensity distribution LID1 has an angular direction corresponding to the other end LG2 from an angular direction corresponding to one end LG1, as shown by the length of the arrow in FIG. 5A. It is an intensity distribution in which the intensity decreases monotonously toward the point.

  In addition, the light source driving unit 51 turns on the second light source 122 of the second light source module 127 and detects it in the detection target space 10R during the second lighting operation (second period) with respect to the first light source unit 12A. Light L2 is emitted. At that time, the first light source 121 is in a light-off state. As a result, the second light intensity distribution LID2 is formed in the detection target space 10R. The second light intensity distribution LID2 has an angular direction corresponding to the one end LG1 from an angular direction corresponding to the other end LG2, as shown in FIG. 5B by the length of the arrow. It is an intensity distribution in which the intensity decreases monotonously toward the point.

  In the second light source unit 12B, during the first lighting operation (first period) when the first light source 121 of the first light source module 126 is lit, and second lighting when the second light source 122 of the second light source module 127 is lit. Also during operation (second period), the first light intensity distribution LID1 and the second light intensity distribution LID2 are formed as in the first light source unit 12A. Therefore, as will be described later, if the first light intensity distribution LID1 and the second light intensity distribution LID2 are used, the distance DS (see FIG. 8) between the center PEs of the first light source unit 12A and the second light source unit 12B is fixed. Therefore, the XY coordinate data of the target object Ob can be detected.

(Detection of angular position of target object Ob)
FIG. 7 is an explanatory diagram showing the principle of detecting the angular position of the target object Ob in the optical position detection device 10 according to the first embodiment of the present invention, and FIGS. 7A and 7B show the light intensity distribution. FIG. 5 is an explanatory diagram of the method of acquiring position information (azimuth information) where the target object exists. FIG. 8 is an explanatory diagram showing the principle of acquiring the XY coordinate data of the target object Ob in the optical position detection device 10 according to the first embodiment of the present invention.

  In this embodiment, when the first light intensity distribution LID1 is formed in the first light source module 126 of the first light source unit 12A, the irradiation direction of the detection light L2 and the intensity of the detection light L2 are shown in FIG. A linear relationship indicated by a line E1 is established. In addition, when the second light intensity distribution LID2 is formed in the second light source module 127 of the first light source unit 12A, the irradiation direction of the detection light L2 and the intensity of the detection light L2 are represented by a line E2 in FIG. It is in the linear relationship shown by. Here, as shown in FIG. 7B and FIG. 8, the target object is in the direction of the angle θ as seen from the center PE of the first light source unit 12A (center of the first light source module 126 / radiation center position of the detection light L2). Suppose that Ob is present. In this case, when the first light intensity distribution LID1 is formed, the intensity of the detection light L2 at the position where the target object Ob is present is INTa. On the other hand, when the second light intensity distribution LID2 is formed, the intensity of the detection light L2 at the position where the target object Ob is present is INTb. Therefore, the light reception intensity at the first light receiving portion 13 when the first light intensity distribution LID1 is formed is compared with the light reception intensity at the first light receiving portion 13B when the second light intensity distribution LID2 is formed. If the relationship between the intensities INTa and INTb is determined, as shown in FIGS. 7B and 8, the angle θ (angle θ1 / angle position) in the direction in which the target object Ob is located with reference to the center PE of the first light source unit 12A. ).

  In detecting the angular position (angle θ1) of the target object Ob using this principle, in the present embodiment, in the first light source unit 12A, the first light intensity distribution LID1 is formed by the first light source module 126. The received light intensity at the first light receiving unit 13 during operation (first period) and the first light receiving unit 13 during the second operation (second period) when the second light intensity distribution LID2 is formed by the second light source module 127. The first drive current value for the first light source 121 and the second drive current value for the second light source 122 are adjusted so that the received light intensity becomes equal. Here, the emission intensity of the detection light L <b> 2 from the first light source unit 12 </ b> A is proportional to the first drive current value for the first light source 121 and the second drive current value for the second light source 122. Therefore, the ratio or difference between the first drive current value and the second drive current value after adjusting the first drive current value for the first light source 121 and the second drive current value for the second light source 122, or the drive current. The angle θ (angle θ1) in the direction in which the target object Ob is located can be obtained from the ratio or difference in the adjustment amount when the value is adjusted.

  More specifically, first, the light source driving unit 51 of the control IC 70 shown in FIG. 6 turns on the first light source 121 as the first lighting operation in the first period to form the first light intensity distribution LID1. In the second period, the second light source 122 is turned on as the second lighting operation to form the second light intensity distribution LID2. At this time, since the first drive current value for the first light source 121 and the second drive current value for the second light source 122 are equal, the first light intensity distribution LID1 and the second light intensity distribution LID2 are in the direction of intensity change. In the opposite direction, the intensity level is the same.

  The adjustment amount calculation unit 74 of the position detection unit 50 illustrated in FIG. 6 includes the light reception intensity INTa of the first light receiving unit 13 during the first lighting operation and the light reception intensity INTb of the first light receiving unit 13 during the second lighting operation. And compare. As a result, when the light receiving intensities INTa and INTb match, the angle θ in the direction in which the target object Ob is positioned is θ = 0 ° shown in FIG. 7B. On the other hand, when the light reception intensities INTa and INTb are different, the adjustment amount calculation unit 74 causes the light reception intensity INTa of the first light receiving unit 13 during the first lighting operation and the first light reception during the second lighting operation. The first drive current value for the first light source 121 and the second drive current value for the second light source 122 are adjusted so that the received light intensity INTb of the unit 13 becomes equal. Then, when the first lighting operation and the second lighting operation are performed again, the light reception intensity INTa of the first light receiving unit 13 during the first lighting operation and the light reception of the first light receiving unit 13 during the second lighting operation. If the intensity INTb is equal, the first angular position detection unit 557 shown in FIG. 6 performs the adjustment and the drive current ratio or difference with respect to the first light source 121 and the second light source 122 after the adjustment. The angle θ (angle θ1) in the direction in which the target object Ob is located is obtained from the ratio and the difference.

  If such an operation is also performed in the second light source unit 12B, the second angular position detection unit 558 shown in FIG. / Angular position). Therefore, the XY coordinate data determination unit 559 shown in FIG. 6 has the angular position (direction of the angle θ1) detected by the first angular position detection unit 557 and the angular position (the angle θ2 of the angle θ2) detected by the second angular position detection unit 558. The position corresponding to the intersection of (direction) is acquired as XY coordinate data where the target object Ob is located.

(Z coordinate data detection principle)
FIG. 9 is an explanatory diagram illustrating the principle of detecting the Z coordinate data of the target object Ob in the optical position detection device 10 according to the first embodiment of the present invention, and FIGS. ) Is an explanatory diagram of the reflected light L3 in a state where the target object Ob is in contact with the viewing surface constituting member 40, and an explanatory diagram of the reflected light L3 in a state where the target object Ob is separated from the viewing surface constituting member 40, It is explanatory drawing which shows the relationship between Z coordinate data and the light reception intensity difference in a light-receiving part.

  In this embodiment, as described below with reference to FIG. 9, the Z coordinate data of the target object Ob is detected by using the detection operation of the XY coordinate data. For example, in the first light source unit 12 </ b> A, a comparison between the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14 when the first light source 121 is driven with a drive current value equal to that of the second light source 122. Using the result, the Z coordinate data of the target object Ob is detected. More specifically, when the first light source unit 12A is driven, the reflected light L3e indicated by a solid line among the detected light L2 (reflected light L3) reflected by the target object Ob is detected by the first light receiving unit 13, and is shown by a dotted line. The reflected light L3f indicated by is detected by the second light receiving unit. At that time, the first light source unit 12A has the central optical axis directed in the direction along the viewing surface 41, and the detection light L2 emitted from the first light source 121 is light that diverges in the Z-axis direction. For this reason, the detection light L <b> 2 emitted from the first light source 121 includes a light component that travels in an oblique direction with respect to the viewing surface 41. Accordingly, of the detection light L2 (reflected light L3) reflected by the target object Ob, the intensity of the reflected light L3 (reflected light L3e) toward the first light receiving unit 13 and the reflected light L3 (reflected) toward the second light receiving unit 14 are reflected. The intensity of the light L3f) is different. As a result, the received light intensity of the reflected light L3 (reflected light L3e) detected by the first light receiving unit 13 is different from the received light intensity of the reflected light L3 (reflected light L3f) detected by the second light receiving unit 14.

  Here, the difference or ratio between the received light intensity of the reflected light L3 (reflected light L3e) detected by the first light receiving part 13 and the received light intensity of the reflected light L3 (reflected light L3f) detected by the second light receiving part 14 9A, the target object Ob is in contact with the viewing surface constituting member 40, and the target object Ob is separated from the viewing surface constituting member 40 as shown in FIG. 9B. It is different from the state. That is, even if the XY coordinate data of the target object Ob is the same, if the position of the target object Ob in the Z-axis direction is different, the received light intensity at the first light receiving unit 13 and the received light intensity D at the second light receiving unit 14 are different. The difference and ratio are different. For example, as shown in FIG. 9C, the difference (ΔD) between the received light intensity D13 at the first light receiving unit 13 and the received light intensity D14 at the second light receiving unit 14 is the position of the target object Ob in the Z-axis direction. It changes monotonously. The relationship shown in FIG. 9C (the relationship between the position of the target object Ob in the Z-axis direction and the difference (ΔD)) varies depending on the position of the target object Ob in the X-axis direction and the position in the Y-axis direction. In any case, the relationship is similar to the relationship shown in FIG.

  Therefore, in this embodiment, in the Z coordinate data acquisition unit 552 described with reference to FIG. 6, the storage unit 552 a stores the XY coordinate data acquired by the XY coordinate data acquisition unit 556 and the light reception by the first light receiving unit 13. Data indicating the difference between the intensity and the received light intensity at the second light receiving unit 14 and the relationship with the Z coordinate data of the target object Ob is stored. Therefore, the Z coordinate data acquisition unit 552 includes the XY coordinate data acquired by the XY coordinate data acquisition unit 556, the received light intensity at the first light receiving unit 13 obtained by the received light intensity comparison unit 78, and the second light receiving unit 14. When the difference from the received light intensity is obtained, the content stored in the storage unit 552a can be used as a lookup table to obtain the Z coordinate data of the target object Ob. Therefore, the XYZ coordinate data acquisition unit 554 acquires the XYZ coordinates of the target object Ob based on the XY coordinates acquired by the XY coordinate data acquisition unit 556 and the Z coordinate data acquired by the Z coordinate data acquisition unit 552. be able to.

  In the above description, the Z coordinate data of the target object Ob is acquired using the first light source unit 12A. However, the second light source unit 12B or both the first light source unit 12A and the second light source unit 12B are used. Then, the Z coordinate data of the target object Ob may be acquired.

(Usage example of Z coordinate data)
Here, the detection accuracy of the Z coordinate data may be lower than that of the XY coordinates due to the influence of the inclination of the target object Ob or the like. In this case, the XYZ coordinate data acquisition unit 554 may determine the positions of the target object Ob in the Z-axis direction as two ranges based on the Z coordinate data.

  For example, if the Z coordinate data of the target object Ob is within a certain range, the XYZ coordinate data acquisition unit 554 determines the viewing surface configuration as the position of the target object Ob in the Z-axis direction, as shown in FIG. When it is determined that the position is away from the member 40 and the Z coordinate data of the target object Ob is in another range, as shown in FIG. 9A, as the position of the target object Ob in the Z-axis direction, You may determine with the position which is in contact with the visual recognition surface structural member 40. FIG.

  According to such a usage example, when the position detection system 1 is used as an input device, the XY coordinate data of the target object Ob is determined as the planned input position when the target object Ob is separated from the viewing surface constituent member 40. When the position of the target object Ob in the Z-axis direction becomes a position in contact with the viewing surface constituting member 40, it can be determined that the XY coordinate data (input position) of the target object Ob is fixed.

(Main effects of this form)
As described above, in the optical position detection device 10 of the present embodiment, when the light source unit 12 emits the detection light L2 radially along the XY plane, the first light receiving unit 13 emits the detection light L2 emission space ( The detection light L2 (reflected light L3) reflected by the target object Ob located in the detection target space 10R) is received, and the position detection unit 50 determines the XY of the target object Ob based on the received light intensity at the first light receiving unit 13. Detect coordinate data. According to this configuration, since the detection light L2 emitted radially from the light source unit 12 is used, the detection light can be emitted with sufficient intensity to the entire detection target space 10R. Therefore, according to the present embodiment, the detection target space 10R is wide.

  Further, in the optical position detection device 10 of the present embodiment, the second light receiving unit 14 is provided at a position separated from the first light receiving unit 13 in the Z-axis direction, and the second light receiving unit 14 is also provided from the light source unit 12. The detection light L2 (reflected light L3) reflected by the target object Ob located in the detection light emission space (detection target space 10R) is received. At this time, the difference (comparison result) between the light receiving intensity at the first light receiving unit 13 and the light receiving intensity at the second light receiving unit 14 varies depending on the position of the target object Ob in the Z-axis direction. Therefore, the position detection unit 50 can detect the position of the target object Ob in the Z-axis direction based on the comparison result between the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14. According to such a configuration, the position of the target object Ob in the Z-axis direction can be detected over the entire wide detection target space 10R.

  In this embodiment, the light source unit 12 includes a first light source unit 12A and a second light source unit 12B provided at a position spaced apart from the first light source unit 12A in the X-axis direction. Accordingly, from the position corresponding to the intersection of the angular position (θ1) of the target object Ob with respect to the first light source unit 12A and the angular position (θ1) of the target object Ob with respect to the second light source unit 12B, the position in the X-axis direction and Y As the position in the axial direction, XY coordinate data of the target object can be obtained.

  Further, since the first light receiving unit 13 and the second light receiving unit 14 are provided between the first light source unit 12A and the second light source unit 12B in the X-axis direction, the light source unit 12 (first light source unit 12A and It is easy to accommodate the second light source unit 12B), the first light receiving unit 13 and the second light receiving unit 14 in a common housing 16.

  In addition, since the first light receiving unit 13 and the second light receiving unit 14 are provided at positions overlapping in the Z-axis direction, the comparison between the light receiving intensity at the first light receiving unit 13 and the light receiving intensity at the second light receiving unit 14 is performed. The result is advantageous in that it is affected only by the position of the target object Ob in the Z-axis direction and is not easily affected by the position of the target object Ob in the X-axis direction and the Y-axis direction.

[Embodiment 2]
FIG. 10 is an explanatory view schematically showing the main part of the optical position detection device 10 according to Embodiment 2 of the present invention. FIGS. 10 (a) and 10 (b) show the optical position detection device 10 in FIG. It is explanatory drawing when it sees from the diagonal direction by the side of detection light emission space, and explanatory drawing when the optical position detection apparatus 10 is seen from the front. FIG. 11 is an explanatory diagram of the light source unit 12 used in the optical position detection device 10 according to Embodiment 2 of the present invention. FIG. 12 is an explanatory diagram illustrating a configuration of a main part of the light source unit 12 illustrated in FIG. 11. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  Also in the position detection system 1 shown in FIG. 10, as in the first embodiment, the optical position detection device 10 emits the detection light L2 radially along the viewing surface 41 (XY plane) (linear shape). Light source unit / first light source unit 12A and second light source unit 12B) and detection light L2 (reflected light L3) reflected by the target object Ob located in the emission space (detection target space 10R) of the detection light L2. 1 light receiving unit 13. Moreover, the optical position detection apparatus 10 has the 2nd light-receiving part 14 arrange | positioned in the position spaced apart in the Z-axis direction with respect to the 1st light-receiving part 13 similarly to Embodiment 1, and this 2nd Similar to the first light receiving unit 13, the light receiving unit 14 also receives the detection light L2 (reflected light L3) reflected by the target object Ob located in the detection target space 10R. Also in the present embodiment, as in the first embodiment, the second light receiving unit 14 includes the first light source unit 12A and the second light source unit among the first light source unit 12A and the second light source unit 12B in the X-axis direction. 12B is arranged at an intermediate position.

  In this embodiment, as the first light receiving unit 13, two light receiving units (first light receiving units 13A and 13B) facing the detection target space 10R at positions separated from the viewing surface constituting member 40 on one side Y1 in the Y axis direction. )have. Of the two first light receiving parts 13 (first light receiving parts 13A and 13B), the first light receiving part 13A is the emission center of the detection light L2 (detection light L2a) emitted radially from the first light source part 12A. The first light receiving unit 13A and the first light source unit 12A are integrated as a first light receiving / emitting unit 15A. In addition, the first light receiving unit 13B is disposed at the radiation center position of the detection light L2 (detection light L2b) emitted radially from the second light source unit 12B, and the first light receiving unit 13B and the second light source unit 12B. Are integrated as a second light emitting / receiving unit 15B. The first light receiving / emitting unit 15 </ b> A and the second light receiving / emitting unit 15 </ b> B configured in this way are housed in a common housing 16 together with the second light receiving unit 14.

  The first light emitting / receiving unit 15A and the second light emitting / receiving unit 15B are located at positions projecting from the viewing surface constituting member 40 to one side Z1 in the Z-axis direction. The first light emitting / receiving unit 15A and the second light emitting / receiving unit 15B operate at different timings. More specifically, in the first light emitting / receiving unit 15A, when the detection light L2a is emitted from the first light source unit 12A, the first light receiving unit 13A is detected by the target object Ob located in the detection target space 10R. Light L2a (reflected light L3) is received. In a period different from this operation, when the detection light L2b is emitted from the second light source unit 12B in the second light receiving and emitting unit 15B, the first light receiving unit 13B is reflected by the target object Ob located in the detection target space 10R. The detected light L2b (reflected light L3) is received.

  As shown in FIGS. 11 and 12, the first light emitting / receiving unit 15A includes a light source support member 150 having a fan shape or a semicircular shape when viewed from the Z-axis direction. The light source support member 150 has a structure in which a first light source support member 151 and a second light source support member 152 are stacked in the Z-axis direction, and each of the first light source support member 151 and the second light source support member 152 has a structure. The fan-shaped or semi-circular flanges 156a and 156b are provided. The portion sandwiched between the flange portions 156a and 156b is an emission portion from which the detection light L2 is emitted from the first light source portion 12A, and the flange portions 156a and 156b define the emission range of the detection light L2 in the Z-axis direction. Restricted.

  Further, in the first light emitting / receiving unit 15A, the first light source unit 12A includes a first light source module 126 and a second light source module 127, which are arranged to overlap in the Z-axis direction, as the emission unit of the detection light L2. . In the first light source unit 12 </ b> A, a portion sandwiched between the first light source module 126 and the second light source module 127 in the Z-axis direction is a translucent light guide unit 128. A first light receiving unit 13A including a photodiode is disposed. Since the second light emitting / receiving unit 15B also has the same configuration as the first light emitting / receiving unit 15A, description thereof is omitted.

  Also in the optical position detection device 10 configured as described above, the second light receiving unit 14 is provided at a position separated from the first light receiving unit 13 in the Z-axis direction, as in the first embodiment. The position of the target object Ob in the Z-axis direction can be detected over the entire large detection target space 10R based on the comparison result between the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14. The same effects as those of the first embodiment are obtained.

  In the present embodiment, the light source unit 12 is a linear light source unit that emits the detection light L2 radially, and the first light receiving unit 13 is disposed at the radiation center position (center PE) of the detection light L2. For this reason, it is convenient to unitize the first light source unit 12A together with the first light receiving unit 13A and unitize the second light source unit 12B together with the first light receiving unit 13B. Further, since the first light receiving unit 13 is arranged at the radiation center position (center PE) of the detection light L2, when the detection light L2 (detection light L2a) is emitted from the first light source unit 12A, the target object Ob. The detection light L2a reflected by the first light receiving portion 13A can be efficiently detected, and the detection light L2b reflected by the target object Ob when the detection light L2 (detection light L2b) is emitted from the second light source portion 12B. Can be efficiently detected by the first light receiving unit 13B.

[Embodiment 3]
FIG. 13 is an explanatory view schematically showing the main part of the optical position detection device 10 according to Embodiment 3 of the present invention. FIGS. 13 (a) and 13 (b) show the optical position detection device 10. It is explanatory drawing when it sees from the diagonal direction by the side of detection light emission space, and explanatory drawing when the optical position detection apparatus 10 is seen from the front.

  Also in the position detection system 1 shown in FIG. 13, as in the first embodiment, the optical position detection device 10 emits the detection light L2 radially along the viewing surface 41 (XY plane) (linear shape). Light source unit / first light source unit 12A and second light source unit 12B) and detection light L2 (reflected light L3) reflected by the target object Ob located in the emission space (detection target space 10R) of the detection light L2. 1 light receiving unit 13. Moreover, the optical position detection apparatus 10 has the 2nd light-receiving part 14 arrange | positioned in the position spaced apart in the Z-axis direction with respect to the 1st light-receiving part 13 similarly to Embodiment 1, and this 2nd Similar to the first light receiving unit 13, the light receiving unit 14 also receives the detection light L2 (reflected light L3) reflected by the target object Ob located in the detection target space 10R. Also in this embodiment, as in the second embodiment, two first light receiving portions 13 (first light receiving portions 13A and 13B) are used as the first light receiving portion 13. The first light receiving unit 13A is disposed at the radiation center position of the detection light L2 (detection light L2a) emitted radially from the first light source unit 12A. The first light receiving unit 13A and the first light source unit 12A are It is integrated as a single light emitting / receiving unit 15A. The first light receiving unit 13B is disposed at the radiation center position of the detection light L2 (detection light L2b) emitted radially from the second light source unit 12B. The first light receiving unit 13B and the second light source unit 12B are The two light emitting / receiving units 15B are integrated.

  In the present embodiment, two second light receiving units 14 (second light receiving units 14A and 14B) are also used for the second light receiving unit 14. 14 A of 2nd light-receiving parts are arrange | positioned in the position which overlaps with the Z-axis direction with respect to 13 A of 1st light-receiving parts arrange | positioned in the radiation | emission center position of the detection light L2 (detection light L2a) radiate | emitted radially from the 1st light source part 12A. The first light receiving unit 13A, the second light receiving unit 14A, and the first light source unit 12A are integrated as a first light receiving / emitting unit 15A. The second light receiving unit 14B is arranged at a position overlapping the first light receiving unit 13B arranged at the radiation center position of the detection light L2 (detection light L2b) emitted radially from the second light source unit 12B in the Z-axis direction. The first light receiving unit 13B, the second light receiving unit 14B, and the second light source unit 12B are integrated as a second light receiving / emitting unit 15B. The first light emitting / receiving unit 15 </ b> A and the second light emitting / receiving unit 15 </ b> B configured as described above are accommodated in a common housing 16.

  Also in the optical position detection device 10 configured as described above, the second light receiving unit 14 is provided at a position separated from the first light receiving unit 13 in the Z-axis direction, as in the first and second embodiments. The position of the target object Ob in the Z-axis direction can be detected over the entire large detection target space 10R based on the comparison result between the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14. it can.

  In addition, second light receiving portions 14A and 14B are disposed at positions overlapping the first light receiving portions 13A and 13B in the Z-axis direction, respectively. For this reason, the difference between the received light intensity at the first light receiving unit 13A and the received light intensity at the second light receiving unit 14A when the first light source unit 12A is turned on, and the second when the second light source unit 12B is turned on. The position in the Z-axis direction of the target object Ob can be detected by using both the difference between the received light intensity at the first light receiving unit 13B and the received light intensity at the second light receiving unit 14B. Further, the first light receiving unit 13A and the second light receiving unit 14A are provided at positions overlapping in the Z-axis direction, and the first light receiving unit 13B and the second light receiving unit 14B are provided at positions overlapping in the Z-axis direction. Therefore, the comparison result between the light receiving intensity at the first light receiving unit 13A and the light receiving intensity at the second light receiving unit 14A is affected only by the position of the target object Ob in the Z-axis direction, and the X-axis direction of the target object Ob. And hardly affected by the position in the Y-axis direction. The comparison result between the light reception intensity at the first light receiving unit 13B and the light reception intensity at the second light receiving unit 14B is influenced only by the position of the target object Ob in the Z-axis direction, and the X-axis direction of the target object Ob and Insensitive to position in the Y-axis direction. Therefore, the position of the target object Ob in the Z-axis direction can be detected with relatively high accuracy.

  In the present embodiment, the light source unit 12 is a linear light source unit that emits the detection light L2 radially, and the first light receiving unit 13 is disposed at the radiation center position (center PE) of the detection light L2. In addition, second light receiving portions 14A and 14B are disposed at positions overlapping the first light receiving portions 13A and 13B in the Z-axis direction, respectively. Therefore, the first light source unit 12A is unitized with the first light receiving unit 13A and the second light receiving unit 14A, and the second light source unit 12B is also unitized with the first light receiving unit 13B and the second light receiving unit 14B. Is good.

[Embodiment 4]
FIG. 14 is an explanatory diagram of the light source unit 12 used in the optical position detection device 10 according to the fourth embodiment of the present invention. FIG. 15 is an explanatory diagram illustrating a configuration of a main part of the light source unit illustrated in FIG. 14. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first to third embodiments, the two light source units 12 (the first light source unit 12A and the second light source unit 12B) are both overlapped in the Z-axis direction with the first light source module 126 and the second light source module 127. 14 and FIG. 15, in this embodiment, each of the two light source units 12 (the first light source unit 12A and the second light source unit 12B) is a single light source. It consists of modules. That is, in both of the two light source parts 12 (the first light source part 12A and the second light source part 12B), the light source 120 (first light source 120 (first light source part) is connected to each of one end LG1 and the other end LG2 of one light guide LG. A light source 121 and a second light source 122) are arranged. Other configurations are the same as those of the first embodiment.

  Even in such a configuration, when the first light source 121 is turned on during the first lighting operation (first period), the first light intensity distribution LID1 shown in FIGS. 5A and 7A can be formed. When the second light source 122 is turned on during the two lighting operation (second period), the second light intensity distribution LID2 shown in FIGS. 5B and 7A can be formed.

  14 and 15, as described in the second embodiment, the light source unit 12 and the first light receiving unit 13 constitute a light emitting / receiving unit, and the first light source unit 12A and the second light source unit 12B. An example in which the second light receiving unit 14 is disposed between the two is shown. In such a configuration, if the first light receiving unit 13 is provided at the radiation center of the light source unit 12, the light source unit 12 prevents the detection light L <b> 2 from entering the first light receiving unit 13. Therefore, in such a case, the first light receiving unit 13 may be provided at a position overlapping the Z axis direction with respect to the radiation center position of the light source unit 12.

  14 and 15, the light source unit 12 having the configuration shown in FIG. 14 is overlapped with the first light receiving unit 13 in the Z-axis direction (Z with respect to the radiation center position of the light source unit 12) as in the third embodiment. When the second light receiving unit 14 is disposed at a position overlapping in the axial direction), or as in the first embodiment, the first light receiving unit 13 and the first light receiving unit 13 are disposed between the first light source unit 12A and the second light source unit 12B. You may employ | adopt when the 2 light-receiving part 14 is arrange | positioned.

[Embodiment 5]
FIG. 16 is an explanatory diagram of the light source unit 12 used in the optical position detection device 10 according to the fifth embodiment of the present invention. FIG. 17 is an explanatory diagram schematically illustrating a detailed configuration of the light source unit 12 illustrated in FIG. 16, and an explanatory diagram illustrating a state in which the detection light L2 is emitted during the first lighting operation (first period). It is explanatory drawing which shows a mode that the detection light L2 is radiate | emitted at the time of 2 lighting operation | movement (2nd period). Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first to fourth embodiments, the light guide LG is used for the light source unit 12, but in this embodiment, the XY coordinates of the target object Ob are detected based on the same principle as in the first embodiment without using the light guide. More specifically, as illustrated in FIG. 16, the light source unit 12 (the first light source unit 12 </ b> A and the second light source unit 12 </ b> B) of the optical position detection device 10 according to the present embodiment each includes a plurality of light sources 120 (first Fan-shaped or semicircular light source support including a strip-shaped flexible substrate 180 on which the light source 121 and the second light source 122) are mounted, and a convex curved surface 155 extending in a shape curved in the length direction (circumferential direction). Member 150. In this embodiment, the convex curved surface 155 has a shape curved in an arc shape in the length direction (circumferential direction).

  In this embodiment, as the flexible substrate 180, a strip-shaped first flexible substrate 181 and a strip-shaped second flexible substrate 182 that is parallel to the first flexible substrate 181 in the width direction (Z-axis direction) are used. . A plurality of first light sources 121 are mounted on the first flexible substrate 181 as a plurality of light sources 120 in the length direction, and a plurality of light sources 120 are mounted on the second flexible substrate 182 in the length direction. As shown, a plurality of second light sources 122 are mounted. As the light source 120, an LED is used.

  In any of the two light source units 12 (the first light source unit 12A and the second light source unit 12B), the light source support member 150 includes the first light source support member 151 and the second light source support member 152 in the Z-axis direction. The first light source support member 151 and the second light source support member 152 are symmetrical with each other in the Z-axis direction. The first light source support member 151 has an arcuate convex curved surface 155a constituting the upper half of the convex curved surface 155, and a convex curved surface at the end of the convex curved surface 155a opposite to the side where the second light source support member 152 is located. And a fan-shaped or semi-circular flange 156a projecting from 155a, and the first flexible substrate 181 is disposed on the convex curved surface 155a. The second light source support member 152 has an arcuate convex curved surface 155b constituting the lower half of the convex curved surface 155, and a convex curved surface at the end of the convex curved surface 155b opposite to the side where the first light source support member 151 is located. And a fan-shaped or semi-circular flange 156b protruding from 155b, and a second flexible substrate 182 is disposed on the convex curved surface 155b. Here, a portion sandwiched between the first flexible substrate 181 and the second flexible substrate 182 in the Z-axis direction is a translucent light guide unit 128, and a photodiode is provided in the back of the light guide unit 128. Further, the first light receiving unit 13 is disposed.

  In the optical position detection device 10 configured as described above, in order to detect the position of the target object Ob in the detection target space 10R, the plurality of first light sources 121 mounted on the first flexible substrate 181 and the second flexible light source The plurality of second light sources 122 mounted on the substrate 182 are turned on in different periods, and the drive currents supplied to each of the plurality of first light sources 121 are made different to be supplied to each of the plurality of second light sources 122. Different drive currents are used. Then, in the first lighting operation (first period) in which all of the plurality of first light sources 121 are turned on and all of the plurality of second light sources 122 are turned off, the level of the emission intensity is indicated by an arrow Pa in FIG. Further, the emission intensity of the first light source 121 is decreased from the side where the one end 181f in the length direction of the first flexible substrate 181 is located toward the side where the other end 181e is located. Therefore, in the first light intensity distribution LID1 of the detection light L2 emitted to the detection target space 10R, the light intensity is high in the angular direction in which the one end 181f in the length direction of the first flexible substrate 181 is located. Thus, the light intensity continuously decreases in the angular direction in which the other end 181e is located.

  On the other hand, in the second lighting operation (second period) in which all of the plurality of second light sources 122 are turned on and all of the plurality of first light sources 121 are turned off, the level of the emission intensity is indicated by the arrow Pb in FIG. As shown, the emission intensity of the second light source 122 is increased from the side where the one end 182f in the length direction of the second flexible substrate 182 is located toward the side where the other end 182e is located. Therefore, in the second light intensity distribution LID2 of the detection light L2 emitted to the detection target space 10R, the light intensity is high in the angular direction in which the other end 182e of the second flexible substrate 182 in the length direction is located. Accordingly, the light intensity continuously decreases in the angular direction in which the one end 182f is located.

  Therefore, if the first lighting operation and the second lighting operation are performed in each of the first light source unit 12A and the second light source unit 12B, the position (XY coordinate) of the target object Ob is determined based on the same principle as in the first embodiment. Can be detected. At that time, the target object is based on the sum of drive currents supplied to the plurality of first light sources 121 (first drive current value) and the sum of drive currents supplied to the plurality of second light sources 122 (second drive current values). What is necessary is just to detect the angular position of Ob. In changing the emission intensity of the plurality of light sources 120, the drive current may be changed for each light source 120 by a resistance element or the like. According to such an embodiment, there is an advantage that the detection light can be emitted with sufficient intensity even at a position separated from the light source unit 12.

  In FIG. 16 and FIG. 17, as described in the second embodiment, the light source unit 12 and the first light receiving unit 13 constitute a light emitting / receiving unit, and the first light source unit 12A and the second light source unit 12B. An example in which the second light receiving unit 14 is disposed between the two is shown. However, the light source unit 12 having the configuration shown in FIGS. 16 and 17 is overlapped with the first light receiving unit 13 in the Z-axis direction (Z with respect to the radiation center position of the light source unit 12) as in the third embodiment. When the second light receiving unit 14 is disposed at a position overlapping in the axial direction), or as in the first embodiment, the first light receiving unit 13 and the first light receiving unit 13 are disposed between the first light source unit 12A and the second light source unit 12B. You may employ | adopt when the 2 light-receiving part 14 is arrange | positioned.

[Embodiment 6]
FIG. 18 is an explanatory diagram of the light source unit 12 used in the optical position detection device 10 according to the sixth embodiment of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiments 1 and 5, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the fifth embodiment, the first light source 121 is turned on in the first lighting operation, and the second light source 122 is turned on in the second lighting operation. However, in this embodiment, as shown in FIG. Only is used. Even in such a configuration, the position of the target object Ob (XY coordinate data) is detected by the same principle as in the first and second embodiments if the drive current supplied to the light source 120 is changed during the first lighting operation and the second lighting operation. can do. That is, in the first lighting operation (first period), as shown by the arrow Pa in FIG. 17A, the intensity of the emission intensity is indicated by the arrow Pa, and the other side from the side where the end of one side in the length direction of the flexible substrate 180 is located. The emission intensity of the light source 120 is decreased toward the side where the end of the side is located. Therefore, in the first light intensity distribution LID1 of the detection light L2 emitted to the detection target space 10R, the light intensity is high in the angular direction in which one end of the length direction of the flexible substrate 180 is located, and from there, The light intensity continuously decreases in the angular direction in which the side end is located. Further, in the second lighting operation (second period), as shown by the arrow Pb in FIG. 17B, the intensity of the emission intensity is indicated by the arrow Pb, and one side from the side where the other end in the length direction of the flexible substrate 180 is located. The emission intensity of the light source 120 is decreased toward the side where the end of the side is located. Therefore, in the second light intensity distribution LID2 of the detection light L2 emitted to the detection target space 10R, the light intensity is high in the angular direction in which the other end portion in the length direction of the flexible substrate 180 is located. The light intensity continuously decreases in the angular direction in which the side end is located.

  Therefore, if the first lighting operation and the second lighting operation are performed in each of the first light source unit 12A and the second light source unit 12B, the XY coordinate data of the target object Ob is obtained on the same principle as in the first and fifth embodiments. Can be detected. At that time, the target object is based on the sum of the drive currents to the light source 120 in the first lighting operation (first drive current value) and the sum of the drive currents to the light source 120 in the second lighting operation (first drive current value). What is necessary is just to detect the angular position of Ob.

  In FIG. 18, as described in the second embodiment, a light emitting / receiving unit is configured by the light source unit 12 and the first light receiving unit 13, and between the first light source unit 12A and the second light source unit 12B. An example in which the second light receiving unit 14 is arranged is shown. In such a configuration, if the first light receiving unit 13 is provided at the radiation center of the light source unit 12, the light source unit 12 prevents the detection light L <b> 2 from entering the first light receiving unit 13. Therefore, the first light receiving unit 13 may be provided at a position overlapping the Z axis direction with respect to the radiation center position of the light source unit 12.

  Further, as in the third embodiment, the light source unit 12 having the configuration shown in FIG. 18 overlaps the first light receiving unit 13 in the Z axis direction (in the Z axis direction with respect to the radiation center position of the light source unit 12). When the second light receiving unit 14 is disposed at an overlapping position), or as in the first embodiment, the first light receiving unit 13 and the second light receiving unit are provided between the first light source unit 12A and the second light source unit 12B. You may employ | adopt when 14 is arrange | positioned.

[Other embodiments]
In the above embodiment, the two light source units 12 are used. However, the position of the target object Ob in the XY plane may be detected using one light source unit 12.

  In the above embodiment, the XY coordinate data of the target object Ob is detected based on the received light intensity at the first light receiving unit 13. However, the received light intensity at the first light receiving unit 13 and the received light intensity at the second light receiving unit 14 are detected. Based on the sum, the XY coordinate data of the target object Ob may be detected.

  In the above embodiment, the light receiving intensity at the first light receiving unit 13 during the first lighting operation is directly compared with the light receiving intensity at the first light receiving unit 13 during the second lighting operation. You may provide the reference light source which radiate | emits the reference light which injects into the 1st light-receiving part 13 without interposing. In such a configuration, the light receiving intensity at the first light receiving unit 13 is compared with the light receiving intensity of the reference light at the first light receiving unit 13 during the first lighting operation, and the first light receiving unit 13 is also used during the second lighting operation. The received light intensity at 1 is compared with the received light intensity of the reference light at the first light receiving unit 13. Therefore, based on the light receiving intensity of the reference light, the light receiving intensity at the first light receiving unit 13 during the first lighting operation and the light receiving intensity at the first light receiving unit 13 during the second lighting operation are indirectly compared. Can do. More specifically, for example, the difference between the received light intensity of the detection light L2 (reflected light L3) of the first light receiving unit 13 and the received light intensity of the reference light of the first light receiving unit 13 during the first lighting operation is expressed as follows. It is processed as the light reception intensity of the first light receiving unit 13 during the lighting operation, and the light reception intensity of the detection light L2 (reflected light L3) of the first light receiving unit 13 and the light reception of the reference light of the first light receiving unit 13 during the second lighting operation. The difference from the intensity is processed as the received light intensity of the first light receiving unit 13 during the second lighting operation. According to such a configuration, there is an advantage that the influence of external light or the like can be offset by the intensity when the reference light is received.

[Configuration example of position detection system]
(Specific example 1 of the position detection system 1)
FIG. 19 is an explanatory diagram of a specific example 1 (display system with an input function) of the position detection system 1 to which the present invention is applied. In the display system with an input function of this embodiment, the configurations of the position detection system 1 and the optical position detection device 10 are the same as those described with reference to FIGS. The same reference numerals are attached and the description thereof is omitted.

  In the position detection system 1 according to the above embodiment, as shown in FIG. 19, the display device 110 is used as the viewing surface constituting member 40, and the optical device described with reference to FIGS. If the position detection device 10 is provided, it can be used as a display system 100 with an input function such as an electronic blackboard or digital signage. Here, the display device 110 is a direct-view display device or a rear projection display device using the viewing surface constituent member 40 as a screen.

  In the display system 100 with an input function, the optical position detection device 10 emits the detection light L2 along the display surface 110a (viewing surface 41) and also detects the detection light L2 (reflected light L3) reflected by the target object Ob. Is detected. For this reason, if the target object Ob is brought close to a part of the image displayed on the display device 110, the position of the target object Ob can be detected. It can be used as input information.

(Specific example 2 of the position detection system 1)
With reference to FIG. 20, the example which comprised the projection type display system with a position function using a screen as the visual recognition surface structural member 40 is demonstrated. FIG. 20 is an explanatory diagram of a specific example 2 (a display system with an input function / a projection display system with an input function) of the position detection system 1 to which the present invention is applied. In the projection display system with a position function of the present embodiment, the configurations of the position detection system 1 and the optical position detection device 10 are the same as the configurations described with reference to FIGS. Are denoted by the same reference numerals and description thereof is omitted.

  In the projection display system 200 with an input function shown in FIG. 20 (display system with an input function), an image projection apparatus 250 (image generation apparatus) called a liquid crystal projector or a digital micromirror device is used as a screen 80 (viewing surface constituent member). 40) An image is projected. In the projection display system 200 with an input function, the image projection device 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 system 200 with an input function, the optical position detection device 10 is added to the image projection device 250 and configured integrally. For this reason, the optical position detection device 10 emits the detection light L2 along the screen surface 80a from a location different from the projection lens system 210, and detects the reflected light L3 reflected by the target object Ob. For this reason, if the target object Ob is brought close to a part of the image projected on the screen 80, the position of the target object Ob can be detected. Therefore, the position of the target object Ob is input as an image switching instruction or the like. It can be used as information.

  If the optical position detection device 10 and the screen 80 are integrated, a screen device with an input function can be configured.

(Other specific examples of the position detection system 1)
In the present invention, the viewing surface constituent member 40 can employ a configuration that is a translucent member that covers the exhibit. In this case, the viewing surface 41 is opposite to the side on which the exhibit is arranged in the translucent member. This is the surface on which the exhibits can be seen. According to such a configuration, a window system with an input function can be configured.

  Further, the viewing surface constituting member 40 can adopt a configuration that is a base that supports a moving game medium. In this case, the visual recognition surface 41 is such that the relative position between the base and the game medium is visually recognized on the base. This is the surface on the other side. According to this configuration, an amusement device such as a pachinko machine or a coin game can be configured as an amusement system with an input function.

DESCRIPTION OF SYMBOLS 1 ... Position detection system 10 ... Optical position detection apparatus 10R ... Detection target space, 12 ... Light source part, 12A ... 1st light source part, 12B ... 2nd light source part, 13, 13A, 13B ··· First light-receiving unit, 14, 14A, 14B ··· Second light-receiving unit, 40 ·· Viewing surface component, 41 ·· Viewing surface, 50 ·· Position detection unit, 100 ·· Display system with input function, 120 ... Light source 121 ... First light source 122 ... Second light source 200 ... Projection display system with input function 250 ... Image projection device Ob ... Target object

Claims (12)

Of the first direction, the second direction orthogonal to the first direction, and the third direction orthogonal to the first direction and the second direction, a virtual plane defined by the first direction and the second direction A light source unit that emits detection light radially along
A first light receiving unit that receives the detection light reflected by a target object located in a detection light emission space from which the detection light is emitted from the light source unit;
A second light receiving unit that receives the detection light reflected by a target object that is spaced apart from the first light receiving unit in the third direction and is located in the detection light emitting space;
The position of the target object in the first direction and the second direction is detected based on at least the received light intensity at the first light receiving unit, and the received light intensity at the first light receiving unit and the received light at the second light receiving unit. A position detector that detects a position of the target object in the third direction based on a comparison result with intensity;
An optical position detection device characterized by comprising:   The position detection unit is configured to compare a light reception intensity at the first light receiving unit and a light reception intensity at the second light receiving unit as a comparison result between the light reception intensity at the first light receiving unit and the light reception intensity at the second light receiving unit. The optical position detection apparatus according to claim 1, wherein the position of the target object in the third direction is detected based on a difference between the optical position detection apparatus and the target object. In the light source unit, the emission intensity of the detection light decreases from one side to the other side of the emission angle range of the detection light during the first period, and the emission intensity of the detection light decreases during the second period. Decreasing from the other side of the light emission angle range to one side,
The position detection unit is configured to detect the first direction and the second direction based on a comparison result between a light reception intensity of the first light receiving unit in the first period and a light reception intensity of the first light receiving unit in the second period. 3. The optical position detection apparatus according to claim 1, wherein an angular position of the target object with respect to the light source unit is detected as the position of the target object.   In the comparison result between the light receiving intensity of the first light receiving unit in the first period and the light receiving intensity of the first light receiving unit in the second period, the position detection unit is configured to detect the position of the first light receiving unit in the first period. The first drive current value for the light source unit in the first period and the second for the light source unit in the second period when the received light intensity is equal to the received light intensity in the first light receiving unit in the second period. The optical position detection device according to claim 3, wherein the position of the target object is detected based on a comparison result with a drive current value.   The first light source unit and the second light source unit provided at a position separated from the first light source unit in the first direction as the light source unit. 5. The optical position detection device according to claim 4.   The optical system according to claim 5, wherein the first light receiving unit and the second light receiving unit are provided between the first light source unit and the second light source unit in the first direction. Position detection device.   The optical position detection device according to claim 5, wherein the first light receiving unit and the second light receiving unit are provided at positions overlapping in the third direction.   The first light receiving unit overlaps with the detection light emission center position of the first light source unit in the third direction, and the detection light emission center position of the second light source unit with respect to the detection light emission center position. The optical position detection device according to claim 5, wherein the optical position detection device is provided at each of the overlapping positions in three directions.   The optical position detection device according to claim 8, wherein the second light receiving unit is provided between the first light source unit and the second light source unit in the first direction.   The second light receiving unit overlaps the detection light emission center position in the first light source unit in the third direction and the detection light emission center position in the second light source unit. The optical position detection device according to claim 8, wherein the optical position detection device is provided at each of the overlapping positions in the direction. A display device that displays an image, and an optical position detection device that detects a position of a target object on the side where the image is displayed with respect to the display device, and the optical position detection device includes the optical position detection device. A display system with an input function in which an image displayed by the display device is switched based on a position detection result of a target object,
The optical position detection device includes a first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction. A light source unit that radiates detection light radially along a virtual plane defined from two directions, and the detection light reflected by a target object located in a detection light emission space from which the detection light is emitted from the light source unit. A first light-receiving unit that receives light, and a second light-receiving unit that is provided at a position spaced apart from the first light-receiving unit in the third direction and receives the detection light reflected by a target object located in the detection light emission space And the position of the target object in the first direction and the second direction based on the received light intensity at the first light receiving unit and the received light intensity at the first light receiving unit and the second light receiving unit. In the third direction based on the comparison result with the received light intensity of Display system with an input function, characterized in that a, a position detector for detecting the position of the target object. An image projection device that projects an image, and an optical position detection device that optically detects a position of a target object located on a side on which the image is projected with respect to the image projection device. A display system with an input function in which the image projected by the image projection device is switched based on a position detection result of the target object in a position detection device,
The optical position detection device includes a first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction. A light source unit that radiates detection light radially along a virtual plane defined from two directions, and the detection light reflected by a target object located in a detection light emission space from which the detection light is emitted from the light source unit. A first light receiving unit that receives light, and a second light receiving unit that is provided at a position spaced in the third direction with respect to the first light receiving unit, and that receives the detection light reflected by a target object located in the detection light emission space. And the position of the target object in the first direction and the second direction based on the received light intensity at the first light receiving unit and the received light intensity at the first light receiving unit and the second light receiving unit. In the third direction based on the comparison result with the received light intensity of Display system with an input function, characterized in that a, a position detector for detecting the position of the target object.

Images