JP2016021118A - Coordinate input device and coordinate input system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coordinate input device and coordinate input system that can correctly detect input coordinates without providing any cut at a corner part of a light guide plate.SOLUTION: An optical member (40) which guides and emits propagated light, emitted from a reverse side of a light guide plate (10), to an imaging unit (20) is arranged between the light guide plate (10) and the imaging unit (20) in a manner that the optical member (40) is bonded to the light guide plate (10) with an adhesive (41). The optical member (40) has a through hole (43) for deaerating the adhesive (41).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coordinate input device and a coordinate input system that perform coordinate detection of the position of an object to be detected that is in contact with the surface of a light guide plate.

  2. Description of the Related Art Conventionally, an optical coordinate input device (a “position detection device” having a light guide plate that receives coordinate input from a detection object such as a stick-shaped operation member (hereinafter referred to as “pen”) or a finger, such as a touch pen or a stylus pen. And a coordinate input system such as a tablet or a touch panel in which a coordinate input device and a display panel are combined is known.

  In the coordinate input system, the coordinate input device obtains the coordinates of the approach or contact position of the pen or finger by approaching or contacting the pen or finger with the coordinate input region of the coordinate input device. The obtained coordinates are displayed as an object such as a point image or a straight line image on a display screen such as a liquid crystal display separate from the coordinate input device or a liquid crystal display panel laminated integrally with the coordinate input device. For use.

  As this type of coordinate input device, for example, coordinate input devices disclosed in Patent Literature 1 and Patent Literature 2 are known.

  In the coordinate input device 100 disclosed in Patent Document 1, as shown in FIG. 12, the four corners 101a, 101b, 101c, and 101d of the light guide plate 101 made of a flat plate to which a fluorescent dye (not shown) is uniformly added are formed on the concave surface. The light receivers 102a, 102b, 102c, and 102d are arranged toward the concave surface. The light receivers 102a to 102d are connected to the detection circuit unit 110, respectively.

  Thus, when the pen 120 having a light source (not shown) is touched on the light guide plate 101, the spot light emitted from the pen 120 enters the light guide plate 101 from the upper surface thereof. As a result, incident light hits the fluorescent dye added to the inside of the light guide plate 101, and the fluorescent dye is excited to emit fluorescence radially. The fluorescence propagates through the light guide plate 101, reaches the concave surfaces of the four corners 101a to 101d, and is emitted toward the light receivers 102a to 102d. As a result, the light receivers 102a to 102d receive this fluorescence, and as a result, the position where the fluorescent dye is excited to emit light can be calculated and specified by the triangulation method. The fluorescent light directed toward the four sides of the light guide plate 101 is absorbed by the light absorbing members 103a, 103b, 103c, and 103d disposed on the four sides of the light guide plate 101, respectively.

  Next, as shown in FIGS. 13A and 13B, the touch panel 200 disclosed in Patent Document 2 includes a light guide plate 201, a light source 202 that makes light incident on the light guide plate 201, and a side surface of the light guide plate 201. Are provided with light receiving elements 203 and 204 and an image forming unit 205. The imaging unit 205 is provided between the light guide plate 201 and the light receiving elements 203 and 204, and forms an image on the light receiving elements 203 and 204 from the light source 202 scattered by the detection target 210. Light absorbing means 206 is disposed on the side surface of the light guide plate 201 on which the light receiving elements 203 and 204 are disposed. The light receiving elements 203 and 204 are disposed outside the irradiation range 207 of the light source 202.

  A notch 208 having a surface perpendicular to the surface of the light guide plate 201 is formed at a corner of the light guide plate 201, and the light receiving elements 203 and 204 receive light emitted from the notch 208. ing.

  The principle of coordinate detection of the touch panel 200 is as follows.

  Light emitted from the light source 202 disposed on the side surface of the light guide plate 201 propagates while repeating total reflection inside the light guide plate 201. In a state where the detected object 210 such as a finger is not touched on the light guide plate 201, the light receiving elements 203 and 204 are disposed outside the irradiation range 207 of the light source 202, and thus do not receive the propagation light propagating inside the light guide plate 201. . On the other hand, when the detection object 210 such as a finger is touched on the transparent light guide plate 201, the propagation light in the light guide plate 201 is disturbed at the touch position of the detection object 210, and scattered light is generated. A part of the scattered light propagates in the direction of the light receiving elements 203 and 204 and is received by the light receiving elements 203 and 204. Thereby, the azimuth angle is measured, and the point where the scattered light is generated by the triangulation method, that is, the point where the detected object 210 such as a finger is touched is specified.

Japanese Patent Laid-Open No. 11-327769 (published on November 30, 1999) JP 2009-258967 A (published on November 5, 2009)

  However, both of the conventional coordinate input device 100 disclosed in Patent Document 1 and the touch panel 200 disclosed in Patent Document 2 need to be provided with notches at the corners of the light guide plate. Processing is complicated. In particular, when the light guide plate is made of glass, notch processing is not easy and the cost is high.

  Therefore, for example, in order to extract the propagation light from the light guide plate, it is conceivable to optically couple the optical member and the light guide plate by bonding and fixing the optical member to the light guide plate. However, when the optical member is bonded to the light guide plate, an air layer is formed between the optical member and the light guide plate. If the air layer is cured without escaping, only the air layer portion has a region having a different refractive index. It is formed. Therefore, after the light incident on the light guide plate is propagated to the optical member, the propagation light cannot be guided to the intended optical path due to the difference in the reflection and refractive index of the interface of the air layer. There is a problem that the position coordinates of the position cannot be detected correctly.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a coordinate input device and a coordinate input system that can correctly detect input coordinates without providing notches in corners of a light guide plate. It is to provide.

  In order to solve the above-described problem, a coordinate input device according to an aspect of the present invention includes a light guide plate that propagates light based on a detection target that is in contact with a surface, and a light that is emitted after being propagated through the light guide plate. In the coordinate input device, comprising: a light receiving unit that receives the propagated propagation light; and a detection unit that obtains coordinates of a contact position of the detected body with the surface of the light guide plate based on an output of the light receiving unit. An optical member that guides the propagating light emitted from the back surface of the light guide plate and emits the light to the light receiving portion is adhered to the light guide plate with an adhesive between the light plate and the light receiving portion. In addition, the optical member is formed with a vent hole for venting the air of the adhesive.

  In order to solve the above-described problem, a coordinate input system according to an aspect of the present invention includes the coordinate input device described above and an image display module provided on the back surface of the coordinate input device. It is said.

  According to one aspect of the present invention, there is an effect of providing a coordinate input device and a coordinate input system that can correctly detect input coordinates without providing a cutout at a corner of the light guide plate.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the coordinate input system provided with the coordinate input device in Embodiment 1 of this invention, Comprising: The structure of the optical member of a coordinate input device. It is a perspective view which shows the structure of the coordinate input system provided with the said coordinate input device. (A) is a perspective view which shows the whole structure of the said optical member, (b) is a perspective view which fractures | ruptures and shows a part of said optical member. It is sectional drawing which shows the structure of the light emission pen of the said coordinate input device. (A) is a perspective view explaining the detection principle of the said coordinate input device, (b) is a top view which shows the detection light in the image pick-up element in the imaging unit of the said coordinate input device. It is a sectional view showing the composition of the coordinate input system provided with the coordinate input device in Embodiment 2 of the present invention, and showing the composition of the optical member of the coordinate input device. It is a perspective view which shows the structure of the light-shielding member provided in the surface of the optical member in the said coordinate input device. It is a sectional view showing the composition of the coordinate input system provided with the coordinate input device in Embodiment 3 of the present invention, and showing the composition of the optical member of the coordinate input device. It is a perspective view which shows the structure of the light-shielding member provided in the surface of the optical member in the said coordinate input device. It is a perspective view which shows the structure of the coordinate input system provided with the coordinate input device in Embodiment 4 of this invention. It is a top view which shows the structure of the linear image imaged by the image pick-up element of the said coordinate input device. It is a top view which shows the structure of the conventional coordinate input device. (A) is a perspective view which shows the structure of the touch panel as a coordinate input system provided with the other conventional coordinate input device, (b) is an expansion perspective view which shows the structure of the light receiving element of a coordinate input device.

[Embodiment 1]
An embodiment of the present invention will be described below with reference to FIGS.

(Configuration of coordinate input system)
A configuration of a coordinate input system including the coordinate input device according to the present embodiment will be described with reference to FIG. FIG. 2 is a perspective view showing the configuration of the coordinate input system 1A of the present embodiment.

  As shown in FIG. 2, the coordinate input system 1A according to the present embodiment includes a liquid crystal display module 2 as an image display module and a coordinate input device 3A provided on the front side of the liquid crystal display module 2. ing.

  The liquid crystal display module 2 includes a liquid crystal display panel (not shown). The liquid crystal display panel sandwiches a liquid crystal layer between a pair of substrates, and each substrate is provided with at least various electrodes for changing the orientation of liquid crystal molecules of the liquid crystal layer by applying a voltage. Then, by changing the orientation of the liquid crystal molecules by applying a voltage, the amount of light transmitted through the liquid crystal layer of each pixel is adjusted to perform a desired display. Note that a conventionally known liquid crystal display module can be used as the configuration of the liquid crystal display module 2.

  In the coordinate input system 1A, while viewing the screen displayed on the liquid crystal display panel of the liquid crystal display module 2, for example, light emission as a detected object is performed on the light guide plate 10 of the coordinate input device 3A provided on the front side of the liquid crystal display panel. By bringing the pen 50 into contact, the coordinates of the contact position on the light-emitting pen 50 are specified, and desired data can be input.

(Configuration of coordinate input device)
Next, the configuration of the coordinate input device 3A provided in the coordinate input system 1A will be described with reference to FIG.

  As shown in FIG. 2, the coordinate input device 3A according to the present embodiment includes the light guide plate 10, the imaging units 20 and 30 as light receiving units, and the light guide plate 10 and the imaging units 20 and 30. An optical member 40 that is tightly fixed to the back surface of the optical plate 10, a detection unit 4 as detection means, and a light-emitting pen 50 as a detection object are provided. With this configuration, when the light emitting pen 50 touches (contacts) the touch surface, which is the surface of the light guide plate 10, the touch position coordinates on the touch surface can be obtained.

  The light guide plate 10 is a rectangular flat plate made of a translucent material, and is disposed on the display surface side of the liquid crystal display module 2 as shown in FIG. The light guide plate 10 is configured such that one side where the imaging units 20 and 30 are disposed is larger than the liquid crystal display module 2, and at least a part of each of the imaging units 20 and 30 is disposed on the back surface, that is, the lower surface side. Thereby, the enlargement of the size of the direction which spreads along the touch surface of coordinate input device 3A is controlled, and it contributes to realization of a compact size.

  The surface of the light guide plate 10 opposite to the liquid crystal display module 2 is a touch surface touched by the light emitting pen 50. That is, the light guide plate 10 exists on the outermost surface of the coordinate input device 3A.

  The light guide plate 10 is made of glass. Thereby, compared with the case where it is comprised with a plastic, it is excellent in environmental resistance, and a bending does not arise. The present embodiment is a mechanism that detects the propagation direction of light propagating through the inside of the light guide plate 10 and detects the light incident position on the light guide plate 10, that is, the position coordinates of the touch position based on the detected direction. Therefore, in spite of the environmental resistance, the bending deteriorates the detection accuracy. Therefore, as in the present embodiment, the light guide plate 10 made of glass can contribute to the realization of highly accurate position coordinate detection without bending. However, in the present invention, the material of the light guide plate is not limited to glass, and may be configured using plastic or a conventionally known material as a light guide material other than these.

  The optical member 40 is a translucent member disposed between the back surface of the light guide plate 10 and the imaging units 20 and 30. The structure of the optical member 40 of this Embodiment is demonstrated based on (a) (b) of FIG.1 and FIG.3. FIG. 1 shows the outer shape of the optical member 40 and is a cross-sectional view taken along line AA ′ in FIG. FIG. 3A is a perspective view showing the overall configuration of the optical member 40, and FIG. 3B is a perspective view showing a part of the optical member 40 in a cutaway manner.

  As shown in FIG. 1, the optical member 40 has a flat surface and is bonded and fixed to the back surface of the light guide plate 10 with an adhesive 41. The optical member 40 has a configuration in which light propagating inside the light guide plate 10 is extracted from the back surface of the light guide plate 10, and the extracted light is incident on itself and coupled inside to propagate inside. ing.

  The bonding method between the optical member 40 and the light guide plate 10 is not particularly limited. However, as described above, since the optical member 40 takes out light from the light guide plate 10 and makes it incident, a method or material that does not hinder this is used. It is preferable to use and fix the adhesive. For example, after applying an adhesive 41 made of an ultraviolet curable resin to the adhesive surface 42 of the optical member 40 and pasting the optical member 40 to the light guide plate 10, ultraviolet light is irradiated from the light guide plate 10 side or the optical member 40 side. To harden and bond.

  However, an air layer may be formed on the bonding surface 42 at that time. When the air layer is cured without escape, regions having different refractive indices are formed only in the air layer portion. As a result, after the light incident on the light guide plate 10 is propagated to the optical member 40, the propagation light cannot be guided to the intended optical path due to the reflection by the interface of the air layer and the difference in refractive index. For this reason, the position coordinates of the incident position cannot be correctly detected. In order to prevent this, it is preferable to provide a through hole 43 in the optical member 40 as described later.

  The optical member 40 is made of a material having the same refractive index as that of the light guide plate 10 or a material having a higher refractive index than that of the light guide plate 10. This prevents the light propagating through the light guide plate 10 from being reflected at the boundary surface between the optical member 40 and the light guide plate 10 and returning to the inside of the light guide plate 10 again. The take-out efficiency can be increased. In the present embodiment, since the light guide plate 10 is made of glass, the optical member 40 is made of high refractive index glass or polycarbonate having a higher refractive index than glass. Thereby, light can be efficiently extracted from the light guide plate 10 and can be incident on the inside of the optical member 40.

  In addition, as mentioned above, since this invention can comprise a light-guide plate from materials other than glass, for example, when a light-guide plate is an acrylic, an optical member is similarly comprised from acrylic, high refractive index glass, and a polycarbonate. can do.

  In the present embodiment, as described above, the optical member 40 is made of a material having a refractive index higher than that of the light guide plate 10. However, the present invention is not necessarily limited thereto, and the light propagating through the light guide plate 10 is configured to be reflected at the boundary surface between the optical member 40 and the light guide plate 10 and not return to the light guide plate 10 again. It's enough. For this reason, the optical member 40 may be made of a material having the same refractive index as that of the light guide plate 10.

  As shown in FIGS. 1 and 3A and 3B, the optical member 40 has a conical cutout as a recess in a region near the corner of the light guide plate 10 on the end surface adjacent to the upper surface. 44 is provided. The angle (γ shown in FIG. 1) formed by the conical surface of the notch 44 and the back surface of the optical member 40 is 45 degrees or less, and 30 degrees or 45 degrees is selected. The conical cutout 44 may be provided with a mirror coating (optical path changing portion).

  In the optical member 40 having the above-described configuration, as shown in FIG. 1, the light propagating through the optical member 40 and reaching the notch 44 has its optical path below the optical member 40, that is, below the optical member 40. Change toward the back. That is, the light propagating through the light guide plate 10 travels downward from the lower surface of the light guide plate 10.

  Here, as described above, in the present embodiment, by providing the through hole 43 in the optical member 40, an air layer is generated on the bonding surface 42 when the optical member 40 and the light guide plate 10 are bonded. It is preventing. However, the through hole 43 should not hinder the progress of light propagating through the light guide plate 10 and the optical member 40. The reason is that the through-hole 43 is also a factor that makes it impossible to correctly detect the position coordinates of the incident position.

  Therefore, in the present embodiment, the position where the through hole 43 is provided is an extension of a line segment passing through the center of the optical member 40 from the point where light enters. In other words, the through hole 43 is formed on the outer peripheral side of the light guide plate with respect to the notch 44 of the optical member 40.

  Thereby, generation | occurrence | production of the air layer to the adhesion surface 42 can be prevented, and it can contribute to highly accurate position coordinate detection, without disturbing advancing of light by presence of the through-hole 43. FIG.

  In the present embodiment, the notch 44 is formed in a conical shape, but the present invention is not limited to this. For example, the notch 44 may be configured in a parabolic shape or a polygonal pyramid shape. That is, the notch 44 needs to have an inclined surface.

  In the present embodiment, the shape of the optical member 40 is circular when viewed from the upper surface side as shown in FIGS. 3A and 3B, but is not limited thereto. . For example, the optical member 40 may be a polygonal column or an elliptical column having an elliptical cross section.

  Moreover, the manufacturing method of the optical member 40 is not particularly limited, but can be manufactured at low cost by plastic molding or glass molding.

  As shown in FIG. 2, the optical member 40 is disposed on the back surface in the vicinity of two adjacent corners of the four corners of the rectangular light guide plate 10. However, the arrangement position of the optical member 40 is not limited to this. In the present embodiment, the two imaging units 20 and 30 are arranged apart from each other in order to realize a detection method described later. Therefore, the optical member 40 is in the middle of the path of the light that has propagated through the light guide plate 10 and finally incident on each of the imaging units 20 and 30 in correspondence with the arrangement positions of the imaging units 20 and 30.・ You can arrange 40.

  The imaging units 20 and 30 are disposed immediately below the conical cutout 44 of the optical member 40, and are disposed at two positions apart from each other at the end of the light guide plate 10. Further, the imaging units 20 and 30 do not protrude above the touch surface of the light guide plate 10.

  The imaging unit 20 includes a lens 21, a visible light cut filter 22, and an imaging element 23. Similarly, the imaging unit 30 includes a lens 31, a visible light cut filter 32, and an imaging element 33. The imaging units 20 and 30 are connected to at least one of the light guide plate 10 and the optical member 40, and have a structure in which light that does not propagate through the light guide plate 10 is not coupled to the imaging elements 23 and 33.

  Next, details of the light-emitting pen 50 of the coordinate input device 3A will be described with reference to FIG. FIG. 4 is a cross-sectional view showing the configuration of the light emitting pen 50.

  The light emitting pen 50 of the present embodiment is an operation member called a so-called touch pen or stylus pen. As shown in FIG. 4, the light-emitting pen 50 includes a light-emitting element 52 a that emits infrared light and a light guide member that guides the infrared light to the tip of the light-emitting pen 50. A light emitting unit 52 having 52b, a power supply device 53, and a control device 54 are stored.

  As a characteristic configuration of the light-emitting pen 50 according to the present embodiment, a light-emitting unit 52 is disposed at the tip of the light-emitting pen 50, and a light diffusion member 55 that diffuses light is attached to the light emission side. .

  The light diffusing member 55 is made of a resin containing a light diffusing material. Glass beads can be used as the light diffusion material. Moreover, as resin, fluororesins, such as a polytetrafluoroethylene, or a silicon rubber can be used, for example, and it is preferable to have elasticity. By using the elastic material, the surface of the light guide plate 10 is not damaged when the tip of the light emitting pen 50, that is, the light diffusion member 55 is used in contact with the light guide plate 10 of the coordinate input device 3A. Further, since the contact portion is slightly deformed by the contact and the contact area with the surface of the light guide plate 10 can be increased, the amount of light coupled to the surface of the light guide plate 10 can be increased.

  The light exit surface of the light diffusing member 55 has a curved surface as shown in FIG. That is, the light diffusing member 55 is generally hemispherical. The curved surface does not need to be configured with a uniform curvature, and the curvature may be different between the region that is the most distal end portion of the light-emitting pen 50 and the region that surrounds it. The curved surface may have a fine uneven shape on the surface.

  Further, the light exit surface of the light diffusing member 55 is preferably subjected to wear resistance processing. This is unnecessary when the light diffusing member 55 is made of polytetrafluoroethylene, but when the light diffusing member 55 is made of another material that is not excellent in wear resistance, the light emission It is effective to apply a wear resistant process to the surface. Although there is no restriction | limiting in particular with an abrasion-resistant process, For example, the process which coats the polytetrafluoroethylene on the light-projection surface of the light-diffusion member 55 is mentioned.

  Further, the light diffusing member 55 is configured to be detachable from the light emitting pen 50. Even if the light diffusing member 55 is damaged for some reason including deterioration with time, it is possible to continue using the light emitting pen 50 only by replacing the light diffusing member 55. Compared with the configuration in which the entire light emitting pen 50 is replaced, the use can be continued at a low cost. In addition, since it is detachable, a groove structure, an occlusal structure, or a structure that fits into the light guide member 52b that is a member to which the light diffusing member 55 is attached, in a portion that contacts the light diffusing member 55. Is provided. Therefore, the light diffusion member 55 is provided with a structure (not shown) that matches the structure.

  In this embodiment, the light diffusion member 55 is attached to the light guide member 52b. However, the present invention is not limited to this, and the light diffusion member 55 is attached to the housing 51. Or other embodiments.

  As the light emitting element 52a, an LED (light emitting diode) or an LD (laser diode) emitting infrared light can be used. The number of LEDs or LDs is not limited to one provided for one light-emitting pen 50, and a plurality of LEDs or LDs may be mounted.

  Infrared light from the light emitting element 52 a that receives light from the power supply device 53 and enters the light diffusing member 55 through the light guide member 52 b is diffusely reflected by the light diffusing material and fine unevenness of the light diffusing member 55. To do. Then, it is emitted as diffused light from the light emitting surface of the light diffusing member 55.

  The power supply device 53 may be configured to be rechargeable, for example, in addition to a configuration in which a battery is incorporated.

  The control device 54 controls the light emission of the light emitting element 52a. For example, a mechanism for emitting light only when the light emitting element 52a comes into contact with the light guide plate 10 is included. This mechanism is configured by using a pressure-sensitive switch or the like, and can control the light emission time, thereby reducing power consumption and extending battery life.

  As described above, the light emitting pen 50 is provided with a light source that emits infrared light, and has a configuration in which infrared light is diffused and emitted from the pen tip. When the pen tip of the light emitting pen 50 comes into contact with the light guide plate 10, part of the infrared light emitted from the pen tip is coupled to the light guide plate 10 and propagates inside the light guide plate 10. Since the light emitting pen 50 diffuses and emits infrared light from the pen tip, the light coupled to the light guide plate 10 diffuses and radiates the inside of the light guide plate 10. Thereby, a position coordinate can be calculated | required accurately.

  As shown in FIG. 2, infrared light propagating through the inside of the light guide plate 10 (hereinafter referred to as “propagating light 5 a, 5 b”) is captured by the imaging units 20, 30 via the optical member 40. Then, the detection unit 4 obtains the two-dimensional position coordinates of the contact from each image obtained from the imaging elements 23 and 33. The light receiving surfaces of the image sensors 23 and 33 are disposed so as to be parallel to the surface of the light guide plate 10.

(Coordinate detection principle of coordinate input device)
The principle of coordinate detection when pen input is performed in the coordinate input device 3A having the above-described configuration will be described in detail with reference to FIGS. 1 and 5A and 5B. FIG. 5A is a perspective view for explaining the detection principle of the coordinate input device 3A, and FIG. 5B is a plane showing detection light at the image sensor 23 in the imaging unit 20 of the coordinate input device 3A. FIG.

As shown in FIG. 1, when the pen tip of the light-emitting pen 50 comes into contact with the surface of the transparent light guide plate 10 that is the touch surface of the coordinate input device 3 </ b> A, a part of the infrared light emitted from the light-emitting pen 50 is refracted. The light enters the light guide plate 10 at the rate N1. Of this incident light, the propagation angle θ _P in the light guide plate 10 is
sin (90 ° −θ _P )> 1 / N
The light flux that satisfies the conditions shown in FIG. 5 is confined in the light guide plate 10, and is repeatedly reflected on the front and back surfaces of the light guide plate 10, and travels in the light guide plate 10. Then, when reaching the interface between the light guide plate 10 and the optical member 40, the light propagating through the light guide plate 10 enters the optical member 40 having a refractive index N2 (N2> N1).

Inside the optical member 40, the propagation angle θ _P in the optical member 40 is
sin (90 ° −θ _P )> 1 / N
The light beam satisfying the conditions shown in FIG. 5 is confined in the optical member 40, is repeatedly reflected on the front surface and the back surface of the optical member 40, and travels in the optical member 40.

  As a result, the infrared light emitted from the light emitting pen 50 is diffused radially around the pen tip, propagates in the light guide plate 10, and part of the light beams 5a and 5b (see FIG. 2). ) Is guided to the conical cutout 44 of the optical member 40. Thereby, the propagating lights 5a and 5b are reflected by the conical surface of the notch 44 of the optical member 40, guided below the optical member 40, and received by the imaging units 20 and 30.

  In the imaging units 20 and 30, the light emitted from the optical member 40 is first condensed by the lenses 21 and 31. Subsequently, the light passes through the visible light cut filters 22 and 32 and is finally received by the image sensors 23 and 33. The visible light cut filters 22 and 32 transmit infrared light emitted from the light-emitting pen 50 and play a role of blocking light in other wavelength bands. The visible light cut filters 22 and 32 block stray light such as sunlight or liquid crystal display panel backlight light, and can increase the SN ratio.

  Next, as shown in FIG. 5A, the light emitted from the light emitting pen 50 and propagated through the light guide plate 10 and the optical member 40, and then the emitted light passes through the lens 21 and passes through the imaging unit. A linear image 25 is formed on the image sensors 23 and 33 at 20 and 30. The position of the linear image 25 varies depending on the position of the light emitting pen 50. Therefore, by analyzing the acquired images of the image sensors 23 and 33, angles α and β formed by the propagation lights 5a and 5b and one side of the light guide plate 10 are obtained. Thereby, the position coordinate of the point which the pen tip used as a light emission source touched can be calculated | required using the principle of triangulation. For example, in FIG. 5A, when the light-emitting pen 50 is at the position P1, the linear image 25 is formed on the imaging element 23 in the imaging unit 20. When the light emitting pen 50 moves to the position P2, a linear image 27 is formed as shown in FIG.

  Here, when the pen tip of the light-emitting pen 50 in the state of irradiating infrared rays is not in contact with the light guide plate 10, nothing appears in the acquired image of the image sensor 23. On the other hand, when the pen tip of the light-emitting pen 50 in the state of irradiating infrared rays comes into contact with the light guide plate 10 and infrared light is coupled to the light guide plate 10, as shown in FIG. Are propagated to the image sensor 23 via the optical member 40. As a result, as shown in FIGS. 5A and 5B, a linear image is formed on the imaging surface of the imaging element 23, and the linear image 25 appears on the acquired image.

  The position of the linear image 25 shown in FIGS. 5A and 5B changes depending on the position of the contact point of the pen tip of the light-emitting pen 50. The image 25 changes like a linear image 27 indicated by a broken line. The locus of the linear image has a fan shape 26 indicated by a one-dot chain line. The rotation angle α1 ′ of the line segment connecting the center 28 of the fan shape 26 and the line image (with the center 28 of the arc as the rotation center) is the line segment connecting the light-emitting pen 50 and the image sensor 23 and the light guide plate 10 described above. The angle is the same as the angle α1 formed by the side A. The angle α1 ′ is obtained from the acquired image of the image sensor, and the angle α1 is obtained from the angle α1 ′. Similarly, when the pen moves to the position P2, a linear image 27 is formed, and the angle α2 ′ is obtained by obtaining the inclination angle α2 ′ of the linear image 27.

  Similarly, for the image sensor 33 of the image pickup unit 30, the position of the light emitting point is specified from the analysis of the acquired image, and the angle β formed by the line segment connecting the light emitting pen 50 and the image sensor 33 and the side A is obtained.

The distance between the image sensors 23 and 33 is L, the bright spot displacement angle obtained by reading the image from the image sensor 23 is α, and the bright spot displacement angle obtained by reading the acquired image from the image sensor 33. Where β is β, the coordinates (X, Y) of the bright spot are the following relational expressions (1)
Y = tan α · X (1)
Y = tan β · (L−X) (2)
Satisfied.

Solving this, the coordinates (X, Y) of the bright spot are
X = tan β · L / (tan α + tan β) (3)
Y = (tan α · tan β) · L / (tan α + tan β) (4)
It is expressed.

  Based on the angles α and β obtained as described above and the interval L that can be obtained in advance, the coordinates X and Y of the point where the pen tip contacts are obtained. Among these, the space | interval L is a space | interval between the image pick-up element 23 and the image pick-up element 33, and is a fixed value. By obtaining the angles α and β, the pen input coordinates X and Y (position coordinates) can be obtained.

  Note that the distance L between the imaging elements 23 and 33 is a distance between the optical axis center of the lens 21 and the optical axis center of the lens 31.

  In order to obtain the position coordinates of the light emitting pen 50 by the above method, the coordinate input system 1A is provided with a detection unit 4 as shown in FIG. The detection unit 4 can be provided in the coordinate input device 3A.

  Further, based on the position coordinates of the light-emitting pen 50 obtained by the above method, the user drives the pixels at the position corresponding to the position coordinates of the liquid crystal display module 2 so as to shine, for example, and the user It is possible to make the touch position visible. For this purpose, a control unit (not shown) that controls driving of the liquid crystal display module 2 may acquire information on the position coordinates obtained by the detection unit 4 and drive the liquid crystal display module 2 based on the information.

  As described above, the coordinate input system 1 </ b> A according to the present embodiment can obtain the position coordinates of the light-emitting pen 50 by capturing the propagated light at at least two locations apart from each other in the light guide plate 10.

  In addition, according to the configuration of the coordinate input device 3 </ b> A of the present embodiment, the imaging units 20 and 30 are provided at positions that do not protrude upward from the touch surface of the light guide plate 10. For this reason, the touch surface of the light guide plate 10 becomes the uppermost surface of the coordinate input device 3A, and the imaging unit does not protrude above the touch surface. Therefore, even when the coordinate input device 3A of the coordinate input system 1A of the present embodiment is applied to a table type terminal, the table surface can be made completely flat without the surroundings rising like a bank. .

  In addition, the coordinate input system 1A according to the present embodiment is not a light shielding method, but has a configuration in which light propagating through the light guide plate 10 is received by the image pickup devices 23 and 33, so that stray light including sunlight is used. Accurate position detection can be realized without the possibility of erroneous recognition. For this reason, it is possible to place the device outdoors or near a window.

  Further, in the coordinate input device 3A of the coordinate input system 1A of the present embodiment, the imaging units 20 and 30 that receive radiated light from the tip of the light emitting pen 50 are connected to the light guide plate 10 and propagate through the light guide plate 10. The light not to be connected is not coupled to the image sensors 23 and 33. As a result, even if illumination light is applied from the normal direction of the touch surface of the light guide plate 10, the light is not coupled to the light guide plate 10, so stray light is not guided to the image sensor. For this reason, the coordinate input device 3A is not easily affected by external light and can be disposed outdoors or near a window.

  In the present embodiment, the light emitted from the tip of the light-emitting pen 50 is configured to diffuse by the light diffusion member 55 provided at the tip of the light-emitting pen 50. Thereby, a sufficient amount of light can be coupled to the light guide plate 10 without depending on the inclination angle of the light emitting pen 50. Therefore, accurate position detection can be realized.

  In the present embodiment, the configuration using a total of two image sensors, that is, the image sensors 23 and 33 has been described. However, the present invention is not limited to this, and from each location at the end of the light guide plate 10. You may collect on one image pick-up element using a mirror and a shutter.

  Further, in the present embodiment, the configuration using one light-emitting pen 50 has been described, but the present invention is not limited to this, and even when a plurality of pens are used, for example, the light emission of each pen If the timing is varied, the position coordinates can be obtained even if a plurality of pens are simultaneously in contact with the touch surface of the light guide plate 10.

  As described above, the coordinate input device 3A of the present embodiment has the light guide plate 10 that propagates the light based on the light emitting pen 50 as the detection target in contact with the surface, and the light guide plate 10 after being propagated through the light guide plate 10. Based on the outputs of the imaging units 20 and 30 that receive the emitted propagation lights 5a and 5b, and the outputs of the imaging units 20 and 30, the light-emitting pen 50 as the detection target contacts the surface of the light guide plate 10 And a detection unit 4 as detection means for obtaining the coordinates of the position. Between the light guide plate 10 and the imaging units 20 and 30, an optical member 40 that guides the propagation lights 5a and 5b emitted from the back surface of the light guide plate 10 and emits the light to the imaging units 20 and 30 is guided. The optical plate 10 is disposed by being bonded with an adhesive 41. In addition, the optical member 40 is formed with a through hole 43 as a vent hole through which the air of the adhesive 41 is removed.

  According to said structure, between the light-guide plate 10 and imaging unit 20 * 30, the light which propagates the propagation light 5a * 5b radiate | emitted from the back surface of the light-guide plate 10, and radiate | emits to the imaging unit 20 * 30. The member 40 is disposed by being bonded to the light guide plate 10 with an adhesive 41.

  Thereby, since it is not necessary to provide a notch in the corner | angular part of the light-guide plate 10, the manufacture process of the light-guide plate 10 is easy. That is, even if the light guide plate 10 itself is not provided with a structure for extracting the propagation lights 5a and 5b, the propagation lights 5a and 5b are extracted from a plurality of locations apart from each other in the light guide plate 10, and the light guide plate 10 It is possible to provide a highly reliable coordinate input device 3A capable of detecting the position coordinates of the light incident position on the upper surface, and a coordinate input system 1A including the coordinate input device 3A.

  Here, in the present embodiment, the optical member 40 is fixed to the light guide plate 10 with an adhesive 41 in order to extract the propagation lights 5 a and 5 b from the light guide plate 10. However, when the optical member 40 is bonded to the light guide plate 10, an air layer is formed between the optical member 40 and the light guide plate 10. If the air layer is cured without escaping, only the air layer portion is formed. Regions having different refractive indexes are formed. Therefore, after the light incident on the light guide plate 10 is propagated to the optical member 40, the propagation light 5a and 5b cannot be guided to the intended optical path due to the reflection by the interface of the air layer and the difference in refractive index. As a result, the position coordinates of the incident position cannot be correctly detected.

  Therefore, in the present embodiment, the optical member 40 is formed with a through hole 43 through which the air of the adhesive 41 is removed. The vent hole is formed as a through hole 43 penetrating from the front surface to the back surface of the optical member 40 as in the present embodiment, for example. Alternatively, for example, a through hole penetrating from the surface of the optical member 40 to the side surface or a through hole penetrating from the surface of the optical member 40 to the inside of the notch 44 can be formed.

  As a result, it is possible to contribute to highly accurate position coordinate detection by preventing the generation of an air layer of the adhesive 41 and preventing the disturbance of the optical path at the interface between the light guide plate 10 and the optical member 40.

  Therefore, it is possible to provide the coordinate input device 3A that can correctly detect the input coordinates without providing a cutout at the corner of the light guide plate 10.

  Moreover, the yield at the time of manufacture can be improved by the air remaining prevention of the adhesive surface 42. FIG. Furthermore, it is only necessary to stick the optical member 40 to the light guide plate 10 at the time of bonding, and no special jig is required.

  In the coordinate input device 3 </ b> A in the present embodiment, the optical member 40 has an inclined surface that guides the propagation lights 5 a and 5 b emitted from the back surface of the light guide plate 10 and emits them to the imaging units 20 and 30. A notch 44 as a recess is formed on the light guide plate side surface of the optical member 40, and the through hole 43 formed in the optical member 40 is formed on the outer periphery side of the light guide plate with respect to the notch 44. Is preferred.

  Thereby, the propagating lights 5a and 5b emitted from the back surface of the light guide plate 10 are incident on the inside of the optical member 40, guided in the inside, and then reflected on the inclined surface of the notch 44 to be captured by the imaging unit. It can be emitted toward 20.30.

  Here, when the through hole 43 exists in the optical path of the light guided inside the optical member 40, the light guided is disturbed in the through hole 43.

  On the other hand, in the present embodiment, the through hole 43 formed in the optical member 40 is formed on the outer side of the light guide plate with respect to the notch 44, so the through hole 43 is formed inside the optical member 40. The light path of the light to be guided exists on the opposite side of the notch 44.

  Therefore, the through hole 43 does not adversely affect the optical path of the light guided inside the optical member 40, and as a result, can contribute to highly accurate position coordinate detection.

  In the coordinate input system 1A of the present embodiment, a coordinate input device 3A and a liquid crystal display module 2 as an image display module provided on the back surface of the coordinate input device 3A are provided.

  Therefore, a plurality of pixels of the liquid crystal display panel in the liquid crystal display module 2 can be driven based on the position coordinates detected by the detection unit 4.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention. For example, in the above-described embodiment, the detection object has been described by exemplifying the light-emitting pen 50 that emits light.

  However, in the present invention, the detection target is not limited to the light emitting pen 50 that emits light, but can be applied to a non-light emission detection target including a finger and a hand. That is, when using a non-light-emitting detection target, for example, an illumination light source for illuminating the inside of the light guide plate 10 is provided at the edge of the light guide plate 10. As a result, the coordinate input device 3A and the coordinate input system 1A in which the through hole 43 as a vent hole is formed in the optical member 40 of the present invention are applied to the detection of the coordinate position where the non-light emitting detection object including the finger and the hand is in contact. It becomes possible to do.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and explanation thereof is omitted.

  In addition to the configuration of the coordinate input system 1A provided with the coordinate input device 3A according to the first embodiment, the coordinate input system 1B provided with the coordinate input device 3B according to the present embodiment has a light guide plate as shown in FIG. 10 is different from the optical member 40 in that a light shielding member 60 is disposed.

  A configuration of a coordinate input system 1B including the coordinate input device 3B according to the present embodiment will be described with reference to FIGS. FIG. 6 is a cross-sectional view showing the configuration of the coordinate input device 3B in the coordinate input system 1B of the present embodiment. FIG. 7 is a perspective view showing a configuration of the light shielding member 60 provided on the surface of the optical member 40 of the coordinate input device 3B in the coordinate input system 1B of the present embodiment.

  In the coordinate input device 3B in the coordinate input system 1B according to the present embodiment, a light shielding member 60 is provided between the light guide plate 10 and the optical member 40, as shown in FIG. In the present embodiment, the light shielding member 60 is provided at the same position as the outer peripheral circle of the conical notch 44 in the optical member 40, as shown in FIG. The same circumferential circular groove 61 as a groove is formed.

  Since the other configuration is the same as the configuration of the coordinate input system 1A provided with the coordinate input device 3A described in the first embodiment, the description thereof is omitted.

  In the coordinate input device 3B and the coordinate input system 1B of the present embodiment, as described above, since the light shielding member 60 is provided between the light guide plate 10 and the optical member 40, unintended external light is excluded. Can do. As a result, the accuracy of position coordinate detection can be improved.

  Further, since the same circumferential circular groove 61 is formed in the light shielding member 60, the spreading of the adhesive 41 can be suppressed by the same circumferential circular groove 61. As a result, it is possible to prevent a decrease in accuracy of position coordinate detection due to the adhesive 41 adhering to the notch 44.

[Embodiment 3]
The following will describe another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first embodiment and the second embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiment 1 and Embodiment 2 are given the same reference numerals, and explanation thereof is omitted.

  In addition to the configuration of the coordinate input system 1B having the coordinate input device 3B of the second embodiment, the coordinate input system 1C having the coordinate input device 3C of the present embodiment has an optical member as shown in FIG. The difference is that a step 45 is provided on the upper surface of 40.

  A configuration of a coordinate input system 1C including the coordinate input device 3C according to the present embodiment will be described with reference to FIGS. FIG. 8 is a cross-sectional view showing the configuration of the coordinate input device 3C in the coordinate input system 1C of the present embodiment. FIG. 9 is a perspective view showing the configuration of the light shielding member 60 of the coordinate input device 3B in the coordinate input system 1B of the present embodiment.

  As shown in FIG. 8, the coordinate input device 3 </ b> C in the coordinate input system 1 </ b> C according to the present embodiment is provided with a step 45 on the outer peripheral edge of the optical member 40 on the bonding surface 42 side. Therefore, the bonding surface 42 of the optical member 40 is a recess.

  Thus, in the coordinate input system 1C provided with the coordinate input device 3C according to the present embodiment, the step 45 is provided on the outer peripheral edge of the optical member 40 on the bonding surface 42 side. As a result, the thickness of the adhesive 41 can be controlled according to the height of the step 45. Further, since the adhesive 41 can be confined in the step 45, it is possible to prevent the adhesive 41 from leaking into the notch 44. Therefore, it is possible to contribute to ensuring the reliability of position coordinate detection and improving the yield during production.

[Embodiment 4]
The following will describe another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first to third embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  In addition to the configuration of the coordinate input system 1A provided with the coordinate input system 1A according to the first embodiment, the coordinate input system 1D provided with the coordinate input device D according to the present embodiment includes two components as shown in FIG. The difference is that the light-emitting pens 50A and 50B can be detected simultaneously.

  A configuration of a coordinate input system 1D including the coordinate input device 3D according to the present embodiment will be described with reference to FIGS. FIG. 10 is a perspective view showing the configuration of the coordinate input device 3D in the coordinate input system 1D of the present embodiment. FIG. 11 is a plan view showing the configuration of the linear image 25 imaged by the imaging devices 23 and 33 of the coordinate input device 3D in the coordinate input system 1D of the present embodiment.

  As shown in FIG. 10, the coordinate input device 3D in the coordinate input system 1D according to the present embodiment can detect two light emitting pens 50A and 50B at the same time.

  In order to obtain such an effect, first, in the present embodiment, the light emitting elements 52a of the light emitting pens 50A and 50B each emit light of a different wavelength.

  In the present embodiment, the visible light cut filters 22 and 32 of the imaging units 20 and 30 are, as shown in FIG. 11, the first filter F1 corresponding to the wavelength of the first propagation light L1 from the light emitting pen 50A. The second filter F2 corresponding to the wavelength of the second propagation light L2 from the light emitting pen 50B is laminated so as to cross the emitted light of the first propagation light L1 and the second propagation light L2 emitted linearly. The filters 22A and 32A are arranged. The first filter F1 and the second filter F2 are continuously and integrally provided.

  As a result, in the image sensors 23 and 33, as shown in FIG. 11, the light emitted from the light emitting pen 50A appears as a linear image 25A in the emitted light of the first propagation light L1. Further, the light emitted from the light emitting pen 50B appears as a linear image 25B in the emitted light of the second propagation light L2. In both cases, an image of two parallel lines appears as parallel lines. The two lines appear in a staggered manner corresponding to the passage of the first filter F1 and the second filter F2.

  Therefore, if two light-emitting pens 50A and 50B are arranged in the line-of-sight direction of one image sensor 23, the light emitted from the light-emitting pen 50A positioned in front of the image sensor 23 in the image sensor 23, As shown in FIG. 11, the light emitted from the light emitting pen 50B located behind the image pickup device 23 appears simultaneously and on the same line as divided linear images 25A and 25B. . The same applies to the other imaging elements 33.

  Therefore, it is possible to obtain one side and both corners of the light-emitting pens 50A and 50B in the light-emitting pens 50A and 50B with the respective image-capturing elements 23 and 33. The plane coordinates of the position on the light guide plate 10 in contact with the pen can be detected.

  As described above, in the coordinate input device 3D of the present embodiment, the light guide plate 10, the imaging units 20 and 30 as the light receiving units that receive the propagation light propagating through the light guide plate 10, and the surface of the light guide plate 10 are covered. Based on the output of the imaging units 20 and 30 that detect the propagation light based on the contact when the light-emitting pens 50A and 50B as the detection bodies are contacted, the positions of the contact positions of the light-emitting pens 50A and 50B on the surface of the light guide plate 10 And a detection unit 4 as detection means for obtaining coordinates. And in this Embodiment, the to-be-detected body consists of the light emitting pen 50A as a 2nd to-be-detected body and the light-emitting pen 50B as a 2nd to-be-detected body. The first propagation light L1 based on the contact of the light emitting pen 50A and the second propagation light L2 based on the contact of the light emitting pen 50B have different wavelengths. Further, the light guide plate 10 is provided with an inclined surface of the notch 44 of the optical member 40 as an optical path changing unit that linearly emits the first propagation light L1 or the second propagation light L2 to the two imaging units 20 and 30, respectively. The first filter F1 corresponding to the wavelength of the first propagation light L1 and the second filter F2 corresponding to the wavelength of the second propagation light L2 are provided between the optical paths of the light guide plate 10 and the imaging units 20 and 30. The first and second propagating light beams L1 and L2 emitted in a linear shape are arranged side by side so as to cross each other.

  As a result, when two types of light-emitting pens 50A and 50B are used at the same time, the light-emitting pens 50A and 50B are easily and reliably identified without being affected by the light-emitting pens 50A and 50B. The coordinate input device 3D and the coordinate input system 1D can be provided.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention. For example, in the above-described embodiment, the case where two types of light-emitting pens 50A and 50B that all emit light are simultaneously used as the plurality of detection objects has been described.

  However, in the present invention, the detection object is not limited to the case where the two types of light emitting pens 50A and 50B that emit light are used at the same time, and when the non-light emission target including two types of fingers and hands is used simultaneously, Alternatively, the present invention can be applied to the case where the light-emitting pen 50 that emits light and the non-light-emitting target are used at the same time. That is, when using a non-light-emitting detection target, for example, an illumination light source for illuminating the inside of the light guide plate 10 is provided at the edge of the light guide plate 10. Further, the light emission wavelength of the illumination light source and the light emission wavelength of the light-emitting pen 50 are made different. Accordingly, when the coordinate input device 3D and the coordinate input system 1D in which the through hole 43 as a vent hole is formed in the optical member 40 of the present invention are used simultaneously with a non-light-emitting detection target including two types of fingers and hands, Alternatively, the present invention can be applied to the case where the light emitting pen 50 that emits light and the non-light emitting detection object are used at the same time.

[Summary]
The coordinate input devices 3A to 3D according to the first aspect of the present invention include a light guide plate 10 that propagates light based on an object to be detected (light emitting pens 50, 50A, and 50B) in contact with the surface, and the light guide plate 10 described above. A light receiving unit (imaging units 20 and 30) that receives the propagation light (propagation light 5a, 5b, first propagation light L1, second propagation light L2) emitted after being propagated, and the light reception unit (imaging unit 20. 30) In a coordinate input device including detection means (detection unit 4) for obtaining coordinates of a position of contact with the surface of the light guide plate 10 in the detected object (light emitting pen 50, 50A, 50B) based on the output of 30) The propagating light (propagating light 5a, 5b, first propagating light L1, second) emitted from the back surface of the light guiding plate 10 is interposed between the light guide plate 10 and the light receiving unit (imaging units 20, 30). Propagating light L2) and receiving the light An optical member 40 that emits light to the (imaging units 20 and 30) is disposed on the light guide plate 10 by being bonded to the light guide plate 10 with an adhesive 41. It is characterized in that pores (through holes 43) are formed. The object to be detected that is in contact with the surface is not limited to the case where the object to be detected is in direct contact with the light guide plate, and in the case of an electrostatic method, the object to be detected approaches the coordinate input area of the light guide plate. Including cases.

  According to the above invention, the optical member that guides the propagation light emitted from the back surface of the light guide plate and emits it to the light receiving portion is bonded to the light guide plate with the adhesive between the light guide plate and the light receiving portion. Arranged.

  Thereby, since it is not necessary to provide a notch in the corner | angular part of a light-guide plate, the manufacturing process of a light-guide plate is easy.

  In the present invention, the optical member is formed with a vent hole for venting the adhesive air. As a result, it is possible to contribute to highly accurate position coordinate detection by preventing the generation of an air layer of the adhesive and preventing the disturbance of the optical path at the interface between the light guide plate and the optical member.

  Therefore, it is possible to provide a coordinate input device that can correctly detect input coordinates without providing a cutout at a corner of the light guide plate.

  The coordinate input devices 3A to 3D according to aspect 2 of the present invention are the coordinate input device according to aspect 1, in which the optical member 40 has propagating light (propagating light 5a, 5b, first light) emitted from the back surface of the light guide plate 10. A concave portion (notch 44) having an inclined surface that guides the propagating light L1 and the second propagating light L2 and emits the propagating light L1 and the second propagating light L2 to the light receiving section (imaging units 20 and 30) is formed on the light guide plate side surface of the optical member 40. In addition, the vent hole (through hole 43) formed in the optical member 40 is preferably formed on the outer peripheral side of the light guide plate with respect to the concave portion (notch 44).

  Further, in the present invention, the vent hole formed in the optical member is formed on the outer peripheral side of the light guide plate with respect to the concave portion. Therefore, the vent hole is the concave portion of the optical path of the light guided inside the optical member. It exists in the position on the opposite side across.

  Therefore, the vent hole does not adversely affect the optical path of the light guided inside the optical member, and as a result, it can contribute to highly accurate position coordinate detection.

  The coordinate input devices 3B and 3C according to Aspect 3 of the present invention are the same as those of the coordinate input device according to Aspect 2, but the propagation of light incident on the optical member 40 from the light guide plate 10 is performed between the optical member 40 and the light guide plate 10. It is preferable that a light shielding member 60 for shielding outside light other than light (propagating light 5a, 5b, first propagating light L1, second propagating light L2) is provided.

  Thereby, between the optical member and the light guide plate, the external light is shielded by disposing a light shielding member that shields external light other than the propagating light incident on the optical member from the light guide plate.

  Therefore, since the light receiving unit does not affect the external light, the detection accuracy of the light receiving unit does not decrease.

  The coordinate input devices 3B and 3C according to aspect 4 of the present invention are the coordinate input device according to aspect 3, in which the light shielding member 60 is connected to the concave portion (notch 44) of the optical member 40 on the surface on the optical member side. It is preferable that an adhesive penetration preventing groove (same circumferential circular groove 61) for preventing the penetration of the adhesive 41 is formed.

  That is, when the adhesive that bonds the light guide plate and the optical member enters the optical path conversion unit such as the inclined surface of the concave portion of the optical member, the reflection direction at the optical path conversion unit changes, so that detection by the light receiving unit is possible. Adversely affected.

  On the other hand, in the present invention, the light shielding member is provided with an adhesive penetration preventing groove for preventing the adhesive 41 from penetrating into the concave portion of the optical member on the surface of the optical member. Has been. This prevents the adhesive applied to the surface of the optical member from penetrating the adhesive formed on the light shielding member when the light guide plate and the optical member are adhered to each other via the light shielding member. It does not soak into the groove and enter further into the optical path conversion section such as the inclined surface of the recess.

  Therefore, the detection accuracy of the light receiving unit does not decrease.

  The coordinate input systems 1A to 1D according to the fifth aspect of the present invention are provided with the coordinate input devices 3A to 3D according to any one of the first to fourth aspects and an image display module provided on the back surface of the coordinate input devices 3A to 3D. It is characterized by being.

  According to the above invention, since the image display module is provided on the back surface of the coordinate input device, a plurality of pixels of the image display panel in the image display module are driven based on the position coordinates detected by the detection means. can do.

  Moreover, in this invention, a coordinate input system provided with the coordinate input device which can detect an input coordinate correctly, without providing a notch in the corner | angular part of a light-guide plate can be provided.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and technical means disclosed in different embodiments are appropriately combined. Embodiments obtained in this manner are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a coordinate input device and a coordinate input system that obtain a coordinate position of a detected object using a detected object such as a light emitting pen or a finger.

1A coordinate input system 1B coordinate input system 1C coordinate input system 1D coordinate input system 2 liquid crystal display module (image display module)
3A Coordinate input device 3B Coordinate input device 3C Coordinate input device 3D Coordinate input device 4 Detector 5a, 5b Propagated light 10 Light guide plate 20 Imaging unit (light receiver)
21 Lens 22 Visible Light Cut Filter 22A Filter 23 Image Sensor 25 Line Image 26 Fan Shape 27 Line Image 28 Center 30 Imaging Unit (Light Receiving Unit)
31 Lens 32 Visible Light Cut Filter 33 Image Sensor 40 Optical Member 41 Adhesive 42 Adhesive Surface 43 Through-hole (Vent Hole)
44 Notch (recess)
45 Step 50 Light emitting pen (object to be detected)
50A Light-emitting pen (object to be detected)
50B Light-emitting pen (object to be detected)
51 Housing 52 Light-emitting portion 52a Light-emitting element 52b Light-guiding member 60 Light-shielding member 61 Same circumferential circular groove (groove for preventing adhesive penetration)
F1 1st filter F2 2nd filter L interval L1 1st propagation light L2 2nd propagation light P1 and P2 position

Claims (5)

Based on the light guide plate that propagates the light based on the detected object in contact with the surface inside, the light receiving unit that receives the propagation light emitted after being propagated through the light guide plate, and the output of the light receiving unit, In a coordinate input device comprising detection means for obtaining the coordinates of the contact position on the surface of the light guide plate in the detected body,
An optical member that guides the propagating light emitted from the back surface of the light guide plate and emits the light to the light receiving portion is bonded to the light guide plate with an adhesive between the light guide plate and the light receiving portion. Being arranged,
The coordinate input device according to claim 1, wherein the optical member is formed with a vent hole for removing air from the adhesive. In the optical member, a concave portion having an inclined surface that guides propagation light emitted from the back surface of the light guide plate and emits the light to the light receiving portion is formed on the light guide plate side surface of the optical member,
The coordinate input device according to claim 1, wherein the vent hole formed in the optical member is formed on the outer peripheral side of the light guide plate with respect to the concave portion.   The light shielding member for shielding outside light other than propagating light incident on the optical member from the light guide plate is disposed between the optical member and the light guide plate. Coordinate input device.   The adhesive member penetration preventing groove for preventing the penetration of the adhesive agent into the concave portion of the optical member is formed in the light shielding member on the surface on the optical member side. 3. The coordinate input device according to 3. The coordinate input device according to any one of claims 1 to 4,
A coordinate input system, comprising: an image display module provided on a back surface of the coordinate input device.

Images