JP2012194130A - 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 preventing occurrence of false detection by eliminating influence of electric noise on a light receiving section, and an input function-equipped display system including the optical position detector.SOLUTION: In an optical position detector 10, when a control IC 70 sequentially supplies high frequency driving pulses to a light source section 12 via a first driving line 125a and a second driving line 125B, the light source section 12 emits detection light L2 in a radiate pattern. At this time, a light receiving section 13 receives detection light L2 which is reflected by a target object Ob located in a detection target space 10R in which the detection light L2 is emitted. The optical position detector 10 is provided with a shielding member 16 that electrically shields the light receiving section 13 from a plurality of light sources 120, driving lines (first driving line 125A, second driving line 125B) and the control IC 70.

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 for optically detecting a target object, for example, a plurality of point light sources are provided at positions separated from each other, and the detection light is reflected from the target object when emitted from each of the plurality of point light sources. There has been proposed one in which detection light is detected by a light receiving unit (see Patent Document 1). In addition, an optical position detection device has been proposed in which detection light emitted from each of a plurality of point light sources is emitted through a light guide plate, and detection light reflected by a target object is detected by a light receiving unit ( (See Patent Documents 2 and 3).

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

  In such an optical position detection device, it is necessary to sequentially turn on a plurality of point light sources in order to detect the position of the target object. Therefore, in order to detect the position of the target object in a short period of time, a point with a high-frequency drive pulse is used. It is necessary to drive the light source. However, with the configuration described in Patent Documents 1 to 3, when a driving pulse is supplied from the light source driving unit to the point light source via the driving line, electrical noise emitted from the light source driving unit, the driving line, and the point light source is reduced. There is a problem that the influence is exerted on the light receiving unit and erroneous detection is likely to occur. In particular, since the signal output when the detection light is received in the light receiving unit is a weak signal, there is a problem that it is easily affected by electrical noise and erroneous detection is likely to occur.

  In view of the above problems, an object of the present invention is to provide an optical position detection device capable of preventing the occurrence of false detection by preventing the influence of electrical noise on the light receiving unit, and the optical position detection device. It is providing the display system with an input function provided with.

  In order to solve the above-described problems, an optical position detection device according to the present invention supplies a light source unit including a plurality of light sources that emit detection light and a driving pulse to the plurality of light sources via a driving line. A light source driving unit, a light receiving unit that receives return light from a space from which the detection light is emitted, and a shield member that electrically shields the light receiving unit from the plurality of light sources, the drive line, and the light source driving unit. It is characterized by having.

  In the optical position detection apparatus according to the present invention, when the light source emits the detection light, the light receiving unit receives the detection light (return light) reflected by the target object located in the space where the detection light is emitted. Here, since the received light intensity at the light receiving unit corresponds to the position of the target object, the optical position detection device can detect the position of the target object based on the received light intensity at the light receiving unit. In the present invention, a shield member that electrically shields the light receiving portion from the plurality of light sources, the drive line, and the light source drive portion is provided. For this reason, even if electrical noise is emitted from the light source drive unit, the drive line, and the light source when the frequency of the drive pulse supplied to the light source is increased to shorten the time required for position detection of the target object It is difficult for the light receiving part to be affected by electrical noise. In particular, the signal that is output when the light receiving unit receives the detection light is quite weak. However, according to the present invention, the signal is not easily affected by electrical noise. Therefore, according to the present invention, it is possible to prevent erroneous detection due to electrical noise.

  In the present invention, the light source unit 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. It is preferable that the detection light is emitted radially along a virtual plane defined from the second direction. According to such a configuration, even when the detection target space is wide, the plurality of light sources can be disposed at relatively close positions, so that the light receiving unit is electrically shielded from the plurality of light sources, the drive line, and the light source drive unit. Is easy.

  In the present invention, the light source driving unit drives the plurality of light sources to reduce the emission intensity of the detection light from one side to the other side of the emission angle range of the detection light during the first period, It is effective to apply to the case where the emission intensity of the detection light is decreased from the other side to the one side of the radiation angle range during the second period. In such a configuration, since the plurality of light sources are driven under different conditions in each of the first period and the second period, the frequency of the driving pulse is increased correspondingly in order to reduce the time required for detecting the position of the target object. Even in this case, according to the present invention, it is possible to prevent the occurrence of erroneous detection due to electrical noise.

  The present invention is effective when applied to a case where the light source unit includes a first light source unit and a second light source unit that emit the detection light in different periods. In such a configuration, since the light source is driven under different conditions in each of the first light source unit and the second light source unit, in order to shorten the time required for detecting the position of the target object, it is necessary to increase the frequency of the drive pulse accordingly. However, even in this case, according to the present invention, it is possible to prevent the occurrence of erroneous detection due to electrical noise.

  In the present invention, the shield member may employ a metal casing in which the plurality of light sources, the drive line, and the light source drive unit are housed.

  In this invention, you may employ | adopt the structure provided with the light source holding member holding the said several light source, the said drive line, and the said light source drive part, and the said shield member being comprised by the metal part of the said light source holding member. According to such a configuration, the holding of the plurality of light sources, the driving lines and the light source driving unit, and the electric shield can be performed by the common member (light source holding member), so there is no need to provide a dedicated shield member. There is an advantage.

  In this case, the light receiving unit may be configured to be held by the light source holding member to constitute a light emitting / receiving unit. If the light shield can be electrically shielded by the light source holding member, even if the light receiving unit is also held by the light source holding member to constitute the light receiving / emitting unit, the light receiving unit is electrically connected to the plurality of light sources, drive lines, and light source driving units. Can be shielded.

  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 having a display surface on which an image is displayed and an optical position detection device that optically detects the position of a target object in a direction along the display surface, the optical position detection device In the display system with an input function in which the image is switched based on the position detection result of the target object in the above, the optical position detection device to which the present invention is applied can be used as the input device. Further, the image projection apparatus for projecting an image, and an optical position detection apparatus for optically detecting the position of the target object in a direction intersecting the image projection direction, the optical position detection apparatus In the display system with an input function in which the image is switched based on the position detection result of the target object, the optical position detection device to which the present invention is applied can be used as the input device. 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 of the light source part of 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 position detection principle 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 of the light emitting / receiving unit of the optical position detection apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the light receiving / emitting unit of the optical position detection apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing of the light source part in the light emitting / receiving unit shown in FIG. 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, directions intersecting each other are defined as an X-axis direction and a Y-axis direction, and directions intersecting the X-axis direction and the Y-axis direction are defined as a Z-axis direction. Accordingly, the first direction in the present invention is the X-axis direction, the second direction is the Y-axis direction, and the third direction is the Z-axis 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.

  In FIG. 1, the position detection system 1 of the present embodiment includes an optical position detection device 10 that detects the position of a target object Ob, and the optical position detection device 10 is in the X-axis direction (first direction). And the position of the target object Ob is detected using the detection light L2 radiate | emitted radially along the virtual XY plane (virtual surface) prescribed | regulated by the Y-axis direction (2nd direction). In this embodiment, the position detection system 1 includes a viewing surface constituent member 40 provided with a viewing surface 41 that extends along the XY plane on one side Z1 in the Z-axis direction (third direction). The apparatus 10 emits the detection light L2 along the viewing surface 41, and detects the position of the target object Ob located on the viewing surface 41 side (one side Z1 in the Z-axis direction) with respect to the viewing surface constituent member 40. Accordingly, 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, and the detection target space 10R includes a light intensity distribution of the detection light L2 described later. Is formed. 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 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. The light receiving unit 13 is disposed between the first light source unit 12A and the second light source unit 12B in the X axis direction at a position separated from the viewing surface constituent member 40 on one side Y1 in the Y axis direction. Is directed to the detection target space 10R. Note that the light receiving unit 13 may be arranged in a one-to-one relationship with the first light source unit 12A and the second light source unit 12B, as described later with reference to FIGS.

  As will be described later, each of the two light source units 12 (the first light source unit 12A and the second light source unit 12B) includes a light source (point light source) including a light emitting element such as an LED (light emitting diode), and has a peak wavelength. Detection light L2 (detection light L2a, L2b) composed of infrared light located at 840 to 1000 nm is emitted as diverging light. The light receiving unit 13 includes a light receiving element such as a photodiode or a phototransistor. In this embodiment, the light receiving element is a photodiode having a sensitivity peak in the infrared region.

  In this embodiment, the light source unit 12 (the first light source unit 12A and the second light source unit 12B) and the light receiving unit 13 are in a position protruding from the viewing surface constituent member 40 to the one side Z1 in the Z-axis direction. The first light source unit 12A and the second light source unit 12B are lit during different periods. Therefore, in this embodiment, first, the detection light L2a is emitted from the first light source unit 12A, and at this time, the light receiving unit 13 detects the detection light L2a (reflected light L3) reflected by the target object Ob located in the detection target space 10R. Is received. Next, the detection light L2b is emitted from the second light source unit 12B, and at this time, the light receiving unit 13 receives the detection light L2b (reflected light L3) reflected by the target object Ob located in the detection target space 10R.

  In the optical position detection device 10, as will be described in detail later, the light source unit 12 and the light receiving unit 13 are both electrically connected to the control IC 70, and the control IC 70 is a control device 60 such as a personal computer. Is electrically connected. The control device 60 is provided with a display 66, a keyboard 67, and the like.

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

  As shown in FIG. 2, in the optical position detection device 10 of the present embodiment, the first light source unit 12A and the second light source unit 12B have the same configuration. More specifically, the first light source unit 12A 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.

  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. Since the 2nd light source part 12B also has the structure similar to 12A of 1st light source parts, description is abbreviate | omitted.

  As shown in FIG. 3, in the first light source unit 12A and the second light source unit 12B, each of the first light source module 126 and the second light source module 127 includes a light source 120 made of a light emitting element such as a light emitting diode, and an arc-shaped A light guide LG is provided. Also in the second light source unit 12B, as 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 made of a light emitting element such as a light emitting diode, and an arc-shaped light guide LG. I have.

  As shown in FIG. 4, in the first light source unit 12 </ b> A and the second light source unit 12 </ b> B, the first light source module 126 uses the first light source 121 made of a light emitting element such as a light emitting diode that emits infrared light as the light source 120. In addition, an arc-shaped light guide LG is 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. Similarly to the first light source module 126, the second light source module 127 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, and an arcuate light guide LG. The second light source 122 is arranged 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.

(Configuration of position detector, etc.)
FIG. 5 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, and FIGS. 5A and 5B are explanations showing the configuration of the control IC. It is explanatory drawing of the drive signal supplied to a figure and a light source. In the optical position detection apparatus 10 used in the position detection system 1 of the present embodiment, the light source unit 12 (first light source unit 12A, second light source unit 12B) and light receiving unit 13 described with reference to FIGS. Is electrically connected to a control IC 70 shown in FIG. 5A, and the control IC 70 is electrically connected to a host control device 60 such as a personal computer via a signal line 69.

  The control IC 70 has a plurality of circuits (not shown) 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. Further, the control IC 70 includes a pulse generator 75a that generates a predetermined drive pulse based on the A-phase reference pulse and a pulse generator 75b that generates a predetermined drive pulse based on the B-phase reference pulse. Yes. Further, the control IC 70 includes a switch unit 76 that is electrically connected to the first light source unit 12A via the first drive line 125A, and the switch unit 76 is connected to the second light source unit 12B. It is electrically connected via the drive line 125B. The switch unit 76 includes the first light source 121 of the first light source unit 12A, the second light source 122 of the first light source unit 12A, the first light source 121 of the second light source unit 12B, and the second light source 122 of the second light source unit 12B. It controls which drive pulse is supplied. The pulse generators 75 a and 75 b and the switch unit 76 constitute the light source driving unit 51.

  The control IC 70 is electrically connected to the light receiving unit 13 via the light reception signal output line 135, and the control IC 70 is connected to the control IC 70 via the light reception signal output line 135. A received light amount measuring unit 73 including an amplifying unit for amplifying the detection result is provided. Further, the control IC 70 controls the pulse generators 75a and 75b based on the measurement result of the received light amount measurement unit 73 to control the first light source 121 of the first light source unit 12A and the second light source 122 of the first light source unit 12A. And an adjustment amount calculation unit 74 that adjusts the drive current value of the drive pulse supplied to the first light source 121 of the second light source unit 12B and the second light source 122 of the second light source unit 12B. The received light amount measurement unit 73 and the adjustment amount calculation unit 74 have a partial function of the position detection unit 50.

  The control IC 70 is controlled by a control unit 61 of a host control device 60 such as a personal computer. The control device 60 includes coordinates that constitute the position detection unit 50 together with the received light amount measurement unit 73 and the adjustment amount calculation unit 74. A data acquisition unit 55 is included. Therefore, in this embodiment, the position detection unit 50 is configured by the received light amount measurement unit 73 and the adjustment amount calculation unit 74 of the control IC 70 and the coordinate data acquisition unit 55 of the host control device 60 (personal computer). .

  In this embodiment, the light source unit 12 includes a first light source unit 12A and a second light source unit 12B that are disposed at positions separated from each other. Therefore, the coordinate data acquisition unit 55 includes a first angular position detection unit 551 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 the second And a second angular position detection unit 552 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 light source unit 12B. In addition, the coordinate data acquisition unit 55 performs object detection based on the angular position of the target object Ob obtained by the first angular position detection unit 551 and the angular position of the target object Ob obtained by the second angular position detection unit 552. A coordinate data determination unit 553 is provided for determining the XY coordinate data of the object Ob.

  In this embodiment, the control IC 70 is multi-channeled, and the first light source unit 12A and the second light source unit 12B are driven by one control IC 70. However, the first light source unit 12A and the second light source unit 12B are driven. Two control ICs 70 having a one-to-one relationship may be used.

  In the optical position detection device 10 configured as described above, the light source driving unit 51 of the control IC 70 is configured to have the first light source unit 12A in the first period (during the first lighting operation) as shown in FIG. A high-frequency drive pulse is applied to the first light source 121, and in the second period (during the second lighting operation), the drive pulse applied to the first light source 121 is opposite to the second light source 122 of the first light source unit 12A. Apply a phase drive pulse. Thereafter, the light source drive unit 51 of the control IC 70 applies a high-frequency drive pulse to the first light source 121 of the second light source unit 12B in the first period (during the first lighting operation), and the second period (second In the second lighting operation), a driving pulse having a phase opposite to that of the driving pulse applied to the first light source 121 is applied to the second light source 122 of the second light source unit 12B. In the optical position detection device 10, voltage modulation and pulse width variation are performed when controlling the drive current value for the light source unit 12.

(Coordinate detection principle)
As shown in FIG. 4, in the optical position detection device 10 of the present embodiment, the light source driving unit 51 described with reference to FIG. 5A is the light source unit 12 (the first light source unit 12A and the second light source unit 12B). ), The first lighting operation (first period) in which the emission intensity of the detection light L2 decreases from one side to the other side of the radiation angle range of the detection light L2, and the emission intensity of the detection light L2 is detected. A second lighting operation (second period) that decreases from the other side of the radiation angle range of the light L2 toward 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 one end LG2 from an angular direction corresponding to one end LG1, as shown by the length of the arrow in FIG. 4A. 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. 4B 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, the first light source 121 of the first light source module 126 is turned on and the second light source 122 of the second light source module 127 is turned on. Similar to the first light source unit 12A, the first light intensity distribution LID1 and the second light intensity distribution LID2 are formed. 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. 7) between the center PEs of the first light source unit 12A and the second light source unit 12B is fixed. Therefore, the position of the target object Ob can be detected.

(Detection of angular position of target object Ob)
FIGS. 6A and 6B are explanatory diagrams showing the position detection principle in the optical position detection device 10 according to the first embodiment of the present invention. FIGS. 6A and 6B are explanatory diagrams of the light intensity distribution and the target object. It is explanatory drawing of the method of acquiring the positional information (azimuth | direction information) in which there exists. FIG. 7 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 Embodiment 1 of the present invention.

  First, 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 represented by a line E1 in FIG. It is in the linear relationship shown by. 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 shown by a line E2 in FIG. It is in the linear relationship shown by. Here, as shown in FIGS. 6B and 7, 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 detection intensity at the light receiving unit 13 when the first light intensity distribution LID1 is formed and the detection intensity at the light receiving unit 13 when the second light intensity distribution LID2 is formed are compared, and the intensity INTa, INTb. 6 (b) and FIG. 7, 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 is obtained. Can do.

  In detecting the angular position (angle θ1) of the target object Ob using this principle, in this embodiment, the first light intensity distribution LID1 is formed by the first light source module 126 in the first light source unit 12A. The first drive current value for the first light source 121 so that the detected intensity at the light receiving unit 13 is equal to the detected intensity at the light receiving unit 13 when the second light intensity distribution LID2 is formed by the second light source module 127. , And the second drive current value for the second light source 122 is adjusted. 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. Accordingly, the ratio or difference between the first 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 and the second light source 122, or the drive current value is determined. The angle θ (angle θ1) in the direction in which the target object Ob is located can be obtained from the ratio or difference of the adjustment amounts at the time of adjustment.

  More specifically, first, the light source driving unit 51 of the control IC 70 shown in FIG. 5A turns on the first light source 121 as the first lighting operation to form the first light intensity distribution LID1, and then As the second lighting operation, the second light source 122 is turned on to form the second light intensity distribution LID2. At this time, the first light intensity distribution LID1 and the second light intensity distribution LID2 have opposite intensity changes, but the intensity levels are the same. The adjustment amount calculation unit 74 of the position detection unit 50 illustrated in FIG. 5A includes the light reception intensity INTa of the light receiving unit 13 during the first lighting operation and the light reception intensity INTb of the light receiving unit 13 during the second lighting operation. Compare As a result, if the light reception intensity INTa of the light receiving unit 13 during the first lighting operation and the light reception intensity INTb of the light receiving unit 13 during the second lighting operation are equal, it can be seen that the angular position of the target object Ob is 0 °. .

  On the other hand, when the received light intensity INTa and INTb are different, the received light intensity INTa of the light receiving unit 13 during the first lighting operation is equal to the received light intensity INTb of the light receiving unit 13 during the second lighting operation. In addition, 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. Then, when the first lighting operation and the second lighting operation are performed again, the light reception intensity INTa of the light receiving unit 13 during the first lighting operation and the light reception intensity INTb of the light receiving unit 13 during the second lighting operation are If they are equal, the first angular position detection unit 551 shown in FIG. 5A indicates the ratio or difference of the drive currents with respect to the first light source 121 and the second light source 122 after such adjustment, or the adjustment amount of 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 and the difference.

  If such an operation is also performed in the second light source unit 12B in different periods, the second angular position detection unit 552 shown in FIG. 5A is the direction in which the target object Ob is positioned with reference to the center PE of the second light source unit 12B. Angle θ (angle θ2 / angle position) can be obtained. Accordingly, the coordinate data determination unit 553 illustrated in FIG. 5A includes the angular position (the direction of the angle θ1) detected by the first angular position detection unit 551 and the angular position (angle) detected by the second angular position detection unit 552. A position corresponding to the intersection of (direction of θ2) is acquired as XY coordinate data where the target object Ob is located.

(Configuration of shield member)
As shown in FIG. 1 and FIG. 5A, the optical position detection device 10 of the present embodiment includes a light source unit 12, a light receiving unit 13, a control IC 70, and a control device 60. The first light source unit 12A, the second light source unit 12B) and the control IC 70 are electrically connected via the first drive line 125A and the second drive line 125B, and the light receiving unit 13 and the control IC 70 output light reception signals. They are electrically connected via a line 135. Here, a driving pulse is supplied from the light source driving unit 51 of the control IC 70 to the light source unit 12 (the first light source unit 12A and the second light source unit 12B) via the first driving line 125A and the second driving line 125B. The In addition, in this embodiment, since the position of the target object Ob is detected by sequentially turning on the plurality of light sources 120, the drive pulse has a high frequency for the purpose of detecting the position of the target object Ob in a short period of time. A driving current of 200 to 300 mA is supplied per light source by a driving pulse, for example, a driving pulse of 125 kHz. On the other hand, the signal output when the light receiving unit 13 receives the detection light L2 is a weak signal and is easily affected by electrical noise.

  Therefore, in the optical position detection apparatus 10 of this embodiment, the light receiving unit 13 is electrically shielded from the plurality of light sources 120, the first drive line 125A, the second drive line 125B, and the control IC 70 (light source drive unit 51). A shield member 16 is provided, and the shield member 16 is disposed between the light receiving unit 13 and the plurality of light sources 120, the first drive line 125A, the second drive line 125B, and the control IC 70 (light source drive unit 51). Intervene.

  In realizing this configuration, in this embodiment, first, a control IC 70 is provided on the opposite side of the second light source unit 12B from the side where the light receiving unit 13 is located. Also, the first light source unit 12A, the second light source unit 12B, the first drive line 125A, the second drive line 125B, and the control IC 70 (light source drive unit 51) are housed in a metal housing 16a, and the housing The casing 16a functions as the shield member 16 by applying a shield potential (for example, a ground potential) to 16a. Here, the casing 16a is generally closed except for the emission part of the detection light L2 from the first light source part 12A and the emission part of the detection light L2 from the second light source part 12B. The light reception signal output line 135 is disposed outside the housing 16a. Therefore, electrical noise is emitted from the light source 120 of the first light source unit 12A, the light source 120 of the second light source unit 12B, the first drive line 125A, the second drive line 125B, and the control IC 70 (light source drive unit 51). Even so, the influence of the electrical noise hardly reaches the light receiving unit 13 and the light receiving signal output line 135.

(Main effects of this form)
As described above, when the light source 120 emits the detection light L2 in the optical position detection device 10 of the present embodiment, the light receiving unit 13 is the target object Ob positioned in the detection target space 10R from which the detection light L2 is emitted. The detection light L2 (return light) reflected by is received. Here, since the light reception intensity at the light receiving unit 13 corresponds to the position of the target object Ob, the position detection unit 50 can detect the position of the target object based on the light reception intensity at the light reception unit 13.

  In this embodiment, the shield member 16 that electrically shields the light receiving unit 13 from the plurality of light sources 120, the drive lines (first drive line 125 </ b> A, second drive line 125 </ b> B), and the control IC 70 (light source drive unit 51). Is provided. For this reason, when the frequency of the drive pulse supplied to the light source 120 is increased to shorten the time required for detecting the position of the target object Ob, the light source 120, the drive line (first drive line 125A, second drive line 125B) Even if the electrical noise is emitted from the control IC 70 (light source driving unit 51), the influence of the electrical noise hardly reaches the light receiving unit 13. In particular, the signal output when the light receiving unit 13 receives the detection light L2 is very weak. However, according to the present embodiment, the influence of electrical noise is less likely to be exerted on the signal. Therefore, according to this embodiment, it is possible to prevent erroneous detection due to electrical noise.

  Further, the light source unit 12 emits the detection light L2 radially, and the light intensity distribution (the first light intensity distribution LID1 and the second light intensity distribution LID1 and the second light intensity change in intensity from one side to the other side in the radiation angle range of the detection light L2. A light intensity distribution LID2) is formed, and the light receiving unit 13 receives the detection light L2 reflected by the target object Ob located in the detection target space 10R where the light intensity distribution is formed. According to this method, since the light intensity distribution of the detection light L2 emitted radially from the light source unit 12 is used, the light intensity distribution can be formed over a wide space, and the detection target space 10R is wide. Even in the case where the detection target space 10R is wide, according to the present embodiment, the plurality of light sources 120 can be arranged at relatively close positions, so that the light receiving unit 13 is replaced with the light source 120, the drive line (first drive line 125A, It is easy to electrically shield from the second drive line 125B) and the control IC 70 (light source drive unit 51).

  Further, in this embodiment, the position detection unit 50 is configured such that the received light intensity at the light receiving unit 13 is equal during the first lighting operation (first period) and the second lighting operation (second period) of the light source unit 12. The first driving current value during the first lighting operation and the second driving current value during the second lighting operation supplied to the light source unit 12 are adjusted, and the angular position is detected based on the adjustment result. For this reason, since the light source 120 is driven under different conditions in each of the first period and the second period, in order to reduce the time required for detecting the position of the target object Ob, it is necessary to increase the frequency of the drive pulse accordingly. However, even in this case, according to this embodiment, it is possible to prevent occurrence of erroneous detection due to electrical noise.

  Moreover, in this embodiment, the light source unit 12 includes the first light source unit 12A and the second light source unit 12B that emit the detection light L2 in different periods, and the first light source unit 12A and the second light source unit 12B. In each, the light source 120 is driven under different conditions. For this reason, in order to shorten the time required to detect the position of the target object Ob, it is necessary to increase the frequency of the drive pulse accordingly, but even in this case, according to the present embodiment, erroneous detection due to electrical noise is caused. Occurrence can be prevented.

  Furthermore, since the detection light L2 is infrared light, it is not visually recognized. Therefore, even when information is displayed on the viewing surface 41, there is an advantage that the detection light L2 does not hinder the viewing of information.

[Embodiment 2]
FIG. 8 is an explanatory diagram of a light emitting / receiving unit of the optical position detection device 10 according to the second embodiment of the present invention. 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.

  As in the first embodiment, the optical position detection device 10 of the present embodiment shown in FIG. 8 is also detected in a radial manner along a virtual XY plane (virtual plane) defined by the X-axis direction and the Y-axis direction. The position of the target object Ob is detected using the light L2. Also in the present embodiment, as in the first embodiment, the optical position detection device 10 includes a light source unit 12 (linear light source unit) that emits the detection light L2 radially and an emission space (detection target) of the detection light L2. And a light receiving unit 13 that receives the detection light L2 (reflected light L3) reflected by the target object Ob located in the space 10R). The light source unit 12 is the same as the first light source unit 12A in the first embodiment. And the 2nd light source part 12B is used.

  In this embodiment, as the light receiving unit 13, a first light receiving unit 13A and a second light receiving unit 13B that face the detection target space 10R at a position separated from one side Y1 in the Y-axis direction are used. 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 second 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 second light receiving unit 13B, the second light source unit 12B, Are integrated as a second light emitting / receiving unit 15B. Accordingly, 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 detects the detection light L2a (reflected) reflected by the target object Ob located in the detection target space 10R. 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 second 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.

  In this embodiment, the first light emitting / receiving unit 15A and the second light emitting / receiving unit 15B have the same configuration. More specifically, 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. In the light source support member 150, a space 158 is provided at the radiation center position of the detection light L2 (detection light L2a) emitted radially from the first light source unit 12A, and the first light receiving unit 13A is disposed in the space 158. ing. Further, in the first light emitting / receiving unit 15A, 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, and the light guide unit 128. The first light receiving portion 13A is arranged in the back of the.

  In this embodiment, the control IC 70 is disposed inside the light source support member 150. Here, the light source support member 150 is made of metal, and the light receiving unit 13 is electrically shielded from the control IC 70, the plurality of light sources 120 shown in FIG. 3 and the like, and the first drive line 125A shown in FIG. The shield member 16 is used. More specifically, in the light source support member 150, the light source 120 shown in FIG. 3 and the first drive line 125A shown in FIG. The control IC 70 is disposed on one side X2 in the X-axis direction with respect to the light receiving unit 13, but the metal wall portion of the light source support member 150 is disposed on both sides in the X-axis direction with respect to the light receiving unit 13. 159 is located. For this reason, the side where the control IC 70, the plurality of light sources 120, and the first drive line 125 </ b> A are located is covered with the metal wall portion 159 with respect to the light receiving unit 13. Therefore, if a shield potential (for example, ground potential) is applied to the light source support member 150 to function as the shield member 16, the light source 120, the first drive line 125A, and the control IC 70 (light source drive) of the first light source unit 12A. Even if the electrical noise is emitted from the part 51), the influence of the electrical noise hardly reaches the first light receiving part 13A and the like. In addition, since the second light emitting / receiving unit 15B has the same configuration as the first light receiving / emitting unit 15A, the influence of electrical noise hardly affects the second light receiving unit 13B and the like. Therefore, the optical position detection device 10 of the present embodiment also has substantially the same effect as that of the first embodiment.

[Modification of Embodiment 2]
In the first and second embodiments, the light source 120 is provided in each of the two ride guides LG. However, the light source 120 is provided at both ends of the one ride guide LG, and the light sources 120 are alternately turned on, Light intensity distributions in opposite directions may be formed in the second period. In this case, when the 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 light receiving unit 13. Even in such a configuration, the detection light L <b> 2 can be incident on the light receiving unit 13 if the light receiving unit 13 is provided at a position overlapping with the radiation center of the light source unit 12 in the Z-axis direction.

[Embodiment 3]
FIG. 9 is an explanatory diagram of a light emitting / receiving unit of the optical position detection device 10 according to the third embodiment of the present invention. FIG. 10 is an explanatory diagram of the light source unit in the light emitting / receiving unit shown in FIG. 9, and FIGS. 10A and 10B show how the detection light L2 is emitted during the first lighting operation in the first period. It is explanatory drawing and explanatory drawing which shows a mode that the detection light L2 is radiate | emitted at the time of the 2nd lighting operation of a 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 and second 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. 9, 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 A light source 121 and a second light source 122), a strip-shaped flexible substrate 180 on which a plurality of light sources 120 are mounted, and a fan-shaped shape including a convex curved surface 155 extending in a shape curved in the length direction (circumferential direction) or And a semicircular light source support 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 (first light source module) and a strip-shaped second flexible substrate 182 that is parallel to the first flexible substrate 181 in the width direction (Z-axis direction). (Second light source module) is 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 both the first light emitting / receiving unit 15A and the second light receiving / emitting unit 15B, the light source support member 150 has a structure in which the first light source support member 151 and the second light source support member 152 are stacked in the Z-axis direction. Thus, 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 lower 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 upper 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.

  In the light source support member 150, a space 158 is provided at the radiation center position of the detection light L2 (detection light L2a) emitted radially from the first light source unit 12A, and the first light receiving unit 13A is disposed in the space 158. Yes. Further, in the first light emitting / receiving unit 15A, 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 portion 128, and the light guide portion 128. The first light receiving portion 13A is arranged in the back of the.

  In this embodiment, the control IC 70 is disposed inside the light source support member 150. Here, the light source support member 150 is made of metal, and the light receiving unit 13 is electrically shielded from the control IC 70, the plurality of light sources 120 shown in FIG. 3 and the like, and the first drive line 125A shown in FIG. The shield member 16 is used. More specifically, on the front side of the light receiving unit 13, the first light source 121, the first flexible substrate 181 (first drive line 125A), the second light source 122, and the second flexible substrate 182 (first drive line 125A). However, convex curved surfaces 155 a and 155 b of a metal light source support member 150 are interposed between these noise generation sources and the light receiving unit 13. Further, the control IC 70 is arranged on one side X2 in the X-axis direction with respect to the light receiving unit 13, but on the both sides in the X-axis direction with respect to the light receiving unit 13, the wall of the metal light source support member 150 is provided. Portion 159 is located. Therefore, if a shield potential (for example, ground potential) is applied to the light source support member 150 to function as the shield member 16, the light source 120, the first drive line 125A, and the control IC 70 (light source) of the first light source unit 12A. Even if the electrical noise is emitted from the drive unit 51), the influence of the electrical noise hardly reaches the first light receiving unit 13A and the like. In addition, since the second light emitting / receiving unit 15B has the same configuration as the first light receiving / emitting unit 15A, the influence of electrical noise hardly affects the second light receiving unit 13B and the like. Therefore, the optical position detection device 10 of the present embodiment also has substantially the same effect as that of the first embodiment.

  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. At that time, 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. As described above, 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 an 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. Further, when 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.

[Modification of Embodiment 3]
In the above embodiment, two light sources 120 are provided, but one light source 120 is provided, and the magnitude relationship of the drive currents supplied to the plurality of light sources 120 is reversed between the first period and the second period. Light intensity distributions in opposite directions may be formed in the first period and the second period. In this case, when the 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 light receiving unit 13. Even in such a configuration, the detection light L <b> 2 can be incident on the light receiving unit 13 if the light receiving unit 13 is provided at a position overlapping with the radiation center of the light source unit 12 in the Z-axis direction.

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

  In the above embodiment, the light reception result at the time of the first lighting operation and the light reception result at the time of the second lighting operation are directly compared, but the reference that emits the reference light incident on the light receiving unit without passing through the detection target space 10R. A light source may be provided. In such a configuration, the light reception result during the first lighting operation is compared with the light reception result of the reference light, the light reception result during the second lighting operation is compared with the light reception result of the reference light, and the light reception result of the reference light is used as a reference. In addition, the light reception result during the first lighting operation and the light reception result during the second lighting operation are indirectly compared. More specifically, the difference between the detection intensity of the detection light L2 (reflected light L3) of the light receiving unit 13 during the first lighting operation and the detection intensity of the reference light of the light receiving unit 13 is expressed as the light receiving unit during the first lighting operation. The difference between the detection intensity of the detection light L2 (reflected light L3) of the light receiving unit 13 during the second lighting operation and the detection intensity of the reference light of the light receiving unit 13 during the second lighting operation The detected intensity of the light receiving unit 13 is processed. 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. 11 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 addition, 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 the configurations described with reference to FIGS. The same reference numerals are used for illustration, and descriptions thereof are omitted.

  In the position detection system 1 according to the above embodiment, as shown in FIG. 11, the display device 110 is used as the viewing surface constituent 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. 12, the example which comprised the projection type display system with an input function using a screen as the visual recognition surface structural member 40 is demonstrated. FIG. 12 is an explanatory diagram of a specific example 2 (display system with an input function / projection type 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 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 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. 12 (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 changed to 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. In such a configuration, the housing 240 of the image projection device 250 may be used as a shield member.

  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 unit, 12A ... First light source unit, 12B ... Second light source unit, 13 .... Light receiving unit , 13A ··· First light receiving portion, 13B · · Second light receiving portion, 15A · · First light emitting and receiving unit, 15B · · Second light emitting and receiving unit, 16 · · Shield member, 16a · · Case, 40 · · · Viewing surface constituting member, 41 ..Viewing surface, 50 ..Position detection unit, 51 ..Light source driving unit, 70 ..Control IC, 100 ..Display system with input function, 120. 1 drive line, 125B ... second drive line, 150 ... light source holding member, 200 ... projection type display system with input function, 250 ... image projection device, Ob ... target object

Claims (9)

A light source unit including a plurality of light sources for emitting detection light;
A light source driving unit for supplying a driving pulse to the plurality of light sources via a driving line;
A light receiving unit that receives return light from the space from which the detection light is emitted;
A shield member that electrically shields the light receiving unit from the plurality of light sources, the drive line, and the light source drive unit;
An optical position detection device characterized by comprising:   The light source unit 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, from the first direction and the second direction. The optical position detection apparatus according to claim 1, wherein the detection light is emitted radially so as to follow a defined virtual plane.   The light source driving unit drives the plurality of light sources to decrease the emission intensity of the detection light from one side to the other side of the emission angle range of the detection light during the first period, and during the second period The optical position detection device according to claim 2, wherein the emission intensity of the detection light is decreased from the other side of the radiation angle range toward the one side.   The optical position according to any one of claims 1 to 3, wherein the light source unit includes a first light source unit and a second light source unit that emit the detection light in different periods. Detection device.   5. The optical type according to claim 1, wherein the shield member is a metal housing that accommodates the plurality of light sources, the drive line, and the light source drive unit therein. 6. Position detection device. A light source holding member that holds the plurality of light sources, the drive line, and the light source drive unit;
The optical position detection device according to any one of claims 1 to 4, wherein the shield member is configured by a metal portion of the light source holding member.   The optical position detection device according to claim 6, wherein the light receiving unit is held by the light source holding member to constitute a light receiving and emitting unit. A display device including a display surface on which an image is displayed; and an optical position detection device that optically detects a position of a target object in a direction along the display surface. The display system with an input function, wherein the image is switched based on the position detection result of the target object,
The optical position detection device includes a light source unit including a plurality of light sources that emit detection light, a light source driving unit that supplies a driving pulse to the plurality of light sources via a driving line, and the detection light is emitted. A light receiving portion that receives return light from the space formed, and a metal shield member that electrically shields the light receiving portion from the plurality of light sources, the drive line, and the light source drive portion. A display system with an input function. An image projection device that projects an image; and an optical position detection device that optically detects a position of a target object in a direction that intersects a projection direction of the image, and the target object in the optical position detection device A display system with an input function in which the image is switched based on the position detection result of
The optical position detection device includes a light source unit including a plurality of light sources that emit detection light, a light source driving unit that supplies a driving pulse to the plurality of light sources via a driving line, and the detection light is emitted. A light receiving portion that receives return light from the space formed, and a metal shield member that electrically shields the light receiving portion from the plurality of light sources, the drive line, and the light source drive portion. A display system with an input function.