JP2014142892A - Optical position detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical position detection device capable of efficiently receiving light emitted from a light emission part by a light reception part corresponding to the light emission part.SOLUTION: A position detection device 1 includes a plurality of light emission parts 7, a plurality of light reception parts 8, and an operation screen 511 on which a touch operation is performed. For each light emission part 7, a light incident part 57 on which light emitted from the light emission part 7 is incident is provided. For each light emission part 7, a light guide part 5 is provided which is configured to guide the light emitted from the light emission part 7 and incident on the light incident part 57 corresponding to the light emission part 7 to the light reception part 8 corresponding to the light emission part 7 among the plurality of light reception parts 8. For each light emission part 7, a first reflection part 910 having a reflection surface for reflecting light so that at least a part of light emitted from the light emission part 7 in directions other than the direction toward the light incident part 57 corresponding to the light emission part 7 is incident on the light incident part 57, is provided in a space between the light emission part 7 and the light guide part 5.

Description

  The present invention relates to an optical position detection device including a light emitting unit, a light receiving unit, a touch operation surface, and a light guide unit that guides light from the light emitting unit to the light receiving unit.

  Conventionally, a light guide plate formed in a rectangular plate shape, a plurality of light emitters arranged in parallel along the upper and left sides of the rectangle of the light guide plate, and a light guide plate arranged in parallel along the lower and right sides of the rectangle of the light guide plate. There is known an optical position detection device including a plurality of light receiving elements that receive light from facing light emitters guided by an optical plate (Patent Document 1). In this optical position detection device, the light received by some of the light receiving elements among the plurality of light receiving elements is reduced by touching a predetermined position on the surface of the light guide plate. For this reason, the optical position detection device detects the touch-operated position based on the position where the light receiving element in which the received light is reduced is arranged.

JP-A 61-43326

  In the optical position detection device described in Patent Document 1, in consideration of an arrangement error at the time of manufacture or expansion / contraction of each member due to a temperature change, a “light guide unit” and a “light emitting unit or light receiving unit” A predetermined space is provided between the two.

  For this reason, for example, light from the light emitting unit is emitted in a direction toward the light guide (light incident on the light guide) and light emitted in a direction other than the direction toward the light guide (guide). Light that does not enter the light portion). In addition, for example, light emitted from the light guide unit is emitted in a direction toward the light receiving unit (light received by the light receiving unit) and light emitted in a direction other than the direction toward the light receiving unit (light receiving unit). Light that is not received).

  When there is a lot of light that is not incident on the light guide unit or when there is a lot of light that the light receiving unit does not receive, the ratio of the light received by the light receiving unit to the light from the light emitting unit decreases, and the light receiving unit cannot receive light efficiently. .

  The present invention has been made in view of the above points, and in an optical position detection device including a light emitting unit, a light receiving unit, and a light guide unit that guides light from the light emitting unit to the light receiving unit, An object of the present invention is to provide an optical position detection device that can efficiently receive the light at a light receiving unit corresponding to the light emitting unit.

  In the first aspect of the present invention, a plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, a touch-operated operation surface, and light emitted from each of the plurality of light emitting units A light guide configured to guide light incident on the light incident unit corresponding to the light emitting unit from the light emitting unit to the light receiving unit corresponding to the light emitting unit; An optical position detection device including a light unit, wherein a first reflection unit that reflects light to each of the plurality of light emitting units is provided, and the first reflection unit is configured to transmit light from the light emitting unit. Among these, at least a part of the light emitted in a direction other than the direction toward the incident portion corresponding to the light emitting portion is configured to be incident on the incident portion.

  According to the first aspect of the present invention, in each of the plurality of light emitting units, in addition to the light emitted from the light emitting unit in the direction toward the incident unit corresponding to the light emitting unit, the light emitting unit At least a part of the light emitted in a direction other than the direction toward the corresponding incident part is incident on the incident part by being reflected by the first reflecting part. As described above, when the light incident on the incident portion increases, light from the light emitting portion corresponding to the incident portion can be efficiently received by the light receiving portion corresponding to the light emitting portion.

  1st aspect of this invention WHEREIN: The light emission part mounting board | substrate with which these light emission parts are mounted is provided, The said light emission part mounts the said light emission part so that light may be radiate | emitted in the surface direction of the said light emission part mounting board | substrate. Mounted on a substrate, the first reflecting portion is located at a position opposite to the light emitting portion mounting substrate between the light emitting portion and the incident portion, and the light reflected by the first reflecting portion is incident on the incident portion. It is preferably provided so as to be incident.

  As a result, in the light from the light emitting unit, a part of the light in the direction other than the direction toward the incident unit corresponding to the light emitting unit is directed to the side opposite to the light emitting unit mounting substrate by the first reflecting unit. The light is reflected and enters the incident portion corresponding to the light emitting portion. As described above, when the light incident on the incident portion increases, light from the light emitting portion corresponding to the incident portion can be efficiently received by the light receiving portion corresponding to the light emitting portion.

  1st aspect of this invention WHEREIN: The said 1st reflection part is the light-emitting part mounting substrate side position between the said light emission part and the said incident part, and the light which the said 1st reflection part reflected in the said incident part. It is preferable that it is further provided so as to be incident.

  Thereby, in the light from the light emitting unit, a part of the light from the light emitting unit toward the light emitting unit mounting substrate is reflected by the first reflecting unit without being absorbed by the light emitting unit mounting substrate. Is incident on an incident portion corresponding to the portion. As described above, when the light incident on the incident portion increases, light from the light emitting portion corresponding to the incident portion can be efficiently received by the light receiving portion corresponding to the light emitting portion.

  1st aspect of this invention WHEREIN: The 2nd reflection part which reflects light is provided with respect to each of the said several light-receiving part, and the said 2nd reflection part is the light from the said light emission part corresponding to the said light reception part. Is configured such that the light receiving unit can receive at least a part of light emitted in a direction other than the direction toward the light receiving unit among the light guided by the light guide unit and emitted. preferable.

  Accordingly, in each of the plurality of light receiving units, at least a part of the light in the direction other than the direction toward the light receiving unit in the light from the light emitting unit corresponding to the light receiving unit emitted from the light guide unit is the second. By being reflected by the reflecting portion, the light receiving portion can receive the reflected light. Therefore, the light received by the light receiving unit can be increased, and the light from the light emitting unit can be received efficiently by the light receiving unit.

  In the first aspect of the present invention, the light receiving unit mounting substrate on which the plurality of light receiving units are mounted is provided, and the plurality of light receiving units receive the light from the surface direction of the light receiving unit mounting substrate. Mounted on a mounting substrate, the second reflecting portion receives light reflected by the second reflecting portion at a position opposite to the light receiving portion mounting substrate between the light receiving portion and the light guide portion. It is preferable to be provided so as to enter the portion.

  Accordingly, in each of the plurality of light receiving units, the light from the light emitting unit corresponding to the light receiving unit emitted from the light guide unit, and the light receiving unit mounting substrate out of the light in the direction other than the direction toward the light receiving unit A part of the light traveling toward the opposite side is reflected by the second reflecting portion, so that the light receiving portion can receive the reflected light. Therefore, the light received by the light receiving unit can be increased, and the light from the light emitting unit can be received efficiently by the light receiving unit.

  1st aspect of this invention WHEREIN: The said 2nd reflection part is the said light-receiving part in the position by the side of the said light-receiving-part mounting board | substrate side between the said light-receiving part and the said light guide part. It is preferable that it is further provided so that it may inject into.

  As a result, in each of the plurality of light receiving units, the light from the light emitting unit corresponding to the light receiving unit emitted from the light guide unit is directed to the light receiving unit mounting substrate out of the light in the direction other than the direction toward the light receiving unit. Part of the light is reflected by the second reflecting portion without being absorbed by the light receiving portion mounting substrate. As a result, the light receiving unit can receive the reflected light. Therefore, the light received by the light receiving unit can be increased, and the light from the light emitting unit can be received efficiently by the light receiving unit.

  According to a second aspect of the present invention, a plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, a touch-operated operation surface, and light emitted from each of the plurality of light emitting units are provided. A light guide configured to guide light incident on the light incident unit corresponding to the light emitting unit from the light emitting unit to the light receiving unit corresponding to the light emitting unit; An optical position detection device comprising an optical part, wherein the incident part is a concave part having an arcuate cross section, and the concave part is a predetermined part of the light emission part of the light emitting part corresponding to the incident part. It is characterized in that it is formed in a virtual spherical partial shape having a radius of a predetermined length.

  According to the second aspect of the present invention, the concave portion of the incident portion is centered on a predetermined point of the portion where the light of the light emitting portion corresponding to the incident portion is emitted and has a virtual radius of a predetermined length. Therefore, the incident angle when the light from the light emitting portion enters the incident portion is 0 ° or close to 0 °.

  For this reason, the light reflected in the surface of an incident part among the lights which go to an incident part from a light emission part reduces, and the light which injects into a light guide part increases. As described above, when the light incident on the incident portion increases, light from the light emitting portion corresponding to the incident portion can be efficiently received by the light receiving portion corresponding to the light emitting portion.

  The third aspect of the present invention has a plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, and an operation surface that is touch-operated, and the light emitted from the light emitting unit, And a light guide unit configured to guide light to the light receiving unit corresponding to the light emitting unit, and reflects light to each of the plurality of light receiving units. A second reflecting part is provided, and the second reflecting part is other than the direction toward the light receiving part out of the light emitted from the light emitting part corresponding to the light receiving part guided by the light guiding part. The light receiving unit is configured to receive at least part of the light emitted in the direction.

  According to the third aspect of the present invention, in each of the plurality of light receiving parts, in the light from the light emitting part corresponding to the light receiving part emitted from the light guide part, the light in a direction other than the direction toward the light receiving part Since at least a part of the light is reflected by the second reflecting portion, the light receiving portion can receive the reflected light. Thereby, the light which the said light-receiving part receives can be increased. Therefore, the light from the light emitting unit can be efficiently received by the light receiving unit corresponding to the light emitting unit.

  In the third aspect of the present invention, in each of the plurality of light emitting portions, an incident portion into which light emitted from the light emitting portion is incident is a concave portion having an arcuate cross section, and the concave portion corresponds to the incident portion. It is preferable that the light emitting portion is formed in a virtual spherical partial shape centered on a predetermined point and having a predetermined length in the portion where light is emitted.

  As a result, the concave portion of the incident portion has a virtual spherical partial shape centered on a predetermined point in a portion where the light of the light emitting portion corresponding to the incident portion is emitted and having a predetermined radius. Since it is formed, the incident angle when the light from the light emitting portion enters the incident portion is 0 ° or an angle close to 0 °.

  For this reason, the light reflected in the surface of an incident part among the lights which go to an incident part from a light emission part reduces, and the light which injects into a light guide part increases. As described above, when the light incident on the incident portion increases, light from the light emitting portion corresponding to the incident portion can be efficiently received by the light receiving portion corresponding to the light emitting portion.

  1st aspect-3rd aspect of this invention WHEREIN: The said light guide part protrudes from the said operation part toward the opposite side to the said operation surface from the said operation surface side with the plate-shaped operation part containing the said operation surface. The outer surface of the side wall portion is continuous with a surface including the operation surface among the surfaces of the operation portion via an inclined surface inclined toward the operation surface, and the side wall The light from the light emitting part is incident on the side of the side wall part opposite to the operation part side, or the incident light is guided to receive the light from the light guiding part. The third reflective surface that reflects light is provided on the inclined surface so that the light reflected by the third reflective surface is directed into the light guide unit. Is preferred.

  Thereby, when the light incident from the incident part is guided to the light receiving part through the inside of the operation part, the third reflection occurs when the light passing between the side wall part and the operation part is incident on the inclined surface. Reflected by the surface. Thereby, the light which passes between a side wall part and an operation part is prevented from radiate | emitting out of a light guide part from an inclined surface. Therefore, in a plurality of light receiving parts, the light guided to the light receiving part can be increased, and the light from the light emitting part can be efficiently received by the light receiving part.

1 is an exploded perspective view of an optical position detection device according to a first embodiment of the present invention. The perspective view of the board | substrate of the optical position detection apparatus of FIG. III-III sectional view taken on the line of FIG. (A) is an enlarged view of region A in FIG. 3, and (b) is an enlarged view of region B in FIG. 4A is an enlarged view showing a light emitting portion and a side wall portion in FIG. 4A, and FIG. 4B is an enlarged view showing a light receiving portion and a side wall portion in FIG. The disassembled perspective view of the optical position detection apparatus of 2nd Embodiment of this invention. (A) is a figure which shows the light emission part of the optical position detection apparatus of FIG. 6, and the side wall part of a light guide part, (b) is a V7B direction ("the side opposite to the light emission surface of a light emission part) in (a). The figure when viewed from the direction of “the surface of the light source” toward the “light emitting surface”. The figure when it sees in the V8 direction in FIG.

[First Embodiment]
With reference to FIGS. 1-5, the optical position detection apparatus (henceforth a "position detection apparatus") of 1st Embodiment of this invention is demonstrated. The position detection device 1 includes a chassis 2, a substrate (light emitting unit mounting substrate and light receiving unit mounting substrate) 3, a spacer 41, a display unit 42, a buffer material 43, a light guide unit 5, and a bezel 6. (See FIG. 1).

  The chassis 2 is formed in a rectangular parallelepiped box shape with one surface opened. A substrate 3 is fixed to the chassis 2 at the opening of the chassis 2 with screws or the like.

  The board 3 is a printed board (for example, a glass epoxy board) on which electronic circuit components and the like are mounted, and is formed in a rectangular plate shape that can be fixed to the opening of the chassis 2. On the substrate 3, a plurality of light emitting portions 7 made of light emitting elements such as light emitting diode packages and a plurality of light receiving portions 8 made of light receiving elements such as photodiodes are mounted.

  Specifically, a plurality of light emitting sections 7 are arranged in parallel along the sides 31 and 32 on the two adjacent sides 31 and 32 on the substrate 3 (see FIG. 2). A plurality of light receiving portions 8 are arranged in parallel along the sides 33 and 34 on the two sides 33 and 34 facing the two adjacent sides 31 and 32 (see FIG. 2). .

  At this time, each light emitting section 7 is mounted on the substrate 3 such that the light emission direction is emitted in the surface direction of the substrate 3. Specifically, the light emission direction of each light emitting unit 7 is a direction from the inside to the outside of the side where the light emitting unit 7 is disposed. That is, each light emitting unit 7 is mounted on the substrate 3 such that the light emitting surface 71 from which the light from the light emitting unit 7 is emitted is directed from the inside to the outside of the side where the light emitting unit 7 is disposed.

  Each light receiving portion 8 is mounted on the substrate 3 so as to receive light from the surface direction of the substrate 3. Specifically, the light received by each light receiving unit 8 is light in a direction from the outside to the inside of the side where the light receiving unit 8 is disposed. That is, each light receiving unit 8 is mounted on the substrate 3 such that the light receiving surface 81 that receives the light of the light receiving unit 8 is directed from the inside to the outside of the side where the light receiving unit 8 is disposed.

  Each of the plurality of light emitting units 7 and the plurality of light receiving units 8 has a predetermined light emitting unit 7 (for example, 7a in FIG. 2) when viewed from the top to the bottom of FIG. Of the plurality of light receiving units 8 arranged in parallel to the side (33 or 34) facing the side (31 or 32) on which the light emitting unit 7 is arranged, the side (31 or 31) on which the light emitting unit 7 is arranged 32) is arranged such that a predetermined light receiving unit 8 (for example, 8a in FIG. 2) is positioned on a straight line (for example, L in FIG. 2) parallel to the side (33 or 34) adjacent to 32).

  Hereinafter, when referring to “the light receiving unit 8 corresponding to the light emitting unit 7”, the light receiving unit 8 is arranged on the same straight line L as the light emitting unit 7 when viewed from the top to the bottom of FIG. 3. The light receiving unit 8 is represented. Further, in the case of “the light emitting unit 7 corresponding to the light receiving unit 8”, the light emitting unit 7 is disposed on the same straight line L as the light receiving unit 8 when viewed from the top to the bottom of FIG. 3. The light emission part 7 is represented.

  The spacer 41 is disposed between the substrate 3 and the display unit 42 in order to secure a predetermined space between the substrate 3 and the display unit 42, and is fixed to the substrate 3 and the display unit 42. At this time, the spacer 41 is on the side opposite to the light emitting surface 71 of each light emitting unit 7 and on the side opposite to the light receiving surface 81 of each light receiving unit 8 (that is, on the substrate 3, each light emitting unit 7 and each light receiving unit). 8 is disposed inside) and is fixed in contact with the surface of the substrate 3.

  The display unit 42 is a display configured to display predetermined information on the upper surface in FIG.

  The light guide unit 5 is made of, for example, an acrylic transparent plastic. The light guide unit 5 guides light incident inside from a predetermined part (an incident part 57 to be described later) by totally reflecting the light from the side surface of the light guide part 5, and a part corresponding to the predetermined part ( It is configured to emit the guided light from the light emitting unit 58 described later to the outside of the light guiding unit 5 (for example, the light guiding path R in FIGS. 4A and 4B). reference).

  Note that the light guide path R shown in FIG. 4 and the like (FIGS. 5 and 8) is an example, and actually, when viewed from the top to the bottom of FIG. There are many light guide paths R along a straight line connecting the light receiving unit 8 corresponding to the light emitting unit 7.

  The light guide unit 5 includes a plate-shaped operation unit 51 including an operation surface 511, and a side wall unit 52 protruding from the operation unit 51 from the operation surface 511 side toward the side opposite to the operation surface 511.

  An outer surface of the side wall portion 52 (hereinafter referred to as “side wall portion outer surface”) 521 is connected to a surface including the operation surface 511 through an inclined surface 53 inclined toward the operation surface 511. The inclined surface 53 is formed so that an angle formed with the operation surface 511 is approximately 135 °, and an angle formed with the side wall portion outer surface 521 is also approximately 135 °. In addition, this angle should just be an angle which the light guide part 5 can guide the light from the light emission part 7 to the light-receiving part 8. FIG.

  In the space surrounded by the side wall 52 of the light guide 5, the display 42 is stored such that the display surface (upper surface in FIG. 1) of the display 42 faces the operation surface 511. . Thereby, the user of the position detection device 1 can see the information displayed on the display unit 42 via the operation surface 511.

  Further, at this time, the buffer material 43 is disposed between the light guide unit 5 and the display unit 42 so that the content displayed on the display unit 42 is not obstructed when viewed from the operation surface 511 side. By disposing the buffer material 43 as described above, the impact transmitted between the display unit 42 and the light guide unit 5 is reduced.

  Further, the tip of the end portion of the side wall portion 52 of the light guide portion 5 on the side opposite to the operation surface 511 side is in contact with the surface on which the light emitting portion 7 and the light receiving portion 8 of the substrate 3 are mounted. At this time, the light guide 5 has a surface 522 opposite to the side wall outer surface 521 of the side wall 52 (hereinafter referred to as “side wall inner surface”) 522 of the light emitting surface 71 of each light emitting unit 7 or each light receiving unit 8. It is arranged so as to face the light receiving surface 81. Thereby, the light guide unit 5 guides the light from the light emitting unit 7 so that the light receiving unit 8 corresponding to the light emitting unit 7 can receive the light.

  In each light emitting unit 7, a region when the light emitting surface 71 of the light emitting unit 7 is projected onto the side wall inner surface 522 along the irradiation direction of the light emitting unit 7 is defined as an incident unit 57. That is, one incident portion 57 is defined for one light emitting portion 7. In addition, the incident part 57 is not restricted to the aspect prescribed | regulated as mentioned above, For example, considering the breadth of the light radiate | emitted from the light emission part 7, the light emission surface 71 of the said light emission part 7 is made into the said light emission part 7's. It may be a mode defined wider than the area when projected onto the side wall inner surface 522 along the irradiation direction.

  Further, in each light emitting unit 7, a portion from which light incident from the incident unit 57 corresponding to the light emitting unit 7 (for example, 7 a in FIG. 2) is guided and emitted is an emission unit 58. Thus, the light emitting unit 7, the incident unit 57, the emitting unit 58, and the light receiving unit 8 correspond to each other.

  In each light emitting unit 7, the light from the light emitting unit 7 enters the incident unit 57 corresponding to the light emitting unit 7. The light incident on the incident portion 57 is totally reflected in the “side wall portion 52 of the light guide portion 5 where the incident portion 57 is provided” and guided toward the operation portion 51. Then, the light is totally reflected by the inclined surface 53 and guided into the operation unit 51, and further, the light is totally reflected inside the operation unit 51 to “to the light guide unit 5 provided with the incident unit 57. The light is guided toward the opposite side wall portion 52 ". Further, the light is totally reflected by the inclined surface 53 and guided into the side wall portion 52, and the light is totally reflected from the side wall portion 52 and light is guided from the emission portion 58 corresponding to the light emitting portion 7. 5 is emitted to the outside. As a result, the light receiving unit 8 corresponding to the light emitting unit 7 receives light.

  In each light emitting unit 7, at least a part of the light emitted from the light emitting unit 7 in a direction other than the direction toward the incident unit 57 corresponding to the light emitting unit 7 is incident on the incident unit 57. Thus, the 1st reflection part 910 which reflects light is provided.

  Thereby, in each incident portion 57, at least a part of the light emitted from the light emitting unit 7 corresponding to the incident portion 57 is emitted in a direction other than the direction toward the incident portion 57. (For example, see the light guide paths R1u and R1d in FIG. 5A), the light incident on the incident portion 57 increases. And the light radiate | emitted from the output part 58 corresponding to the said incident part 57 increases. Therefore, the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8 corresponding to the light emitting unit 7 as compared with the case where the upper first reflecting unit 911 is not provided.

  Specifically, the first reflection unit 910 includes an upper first reflection unit 911 and a lower first reflection unit 913. The upper first reflecting portion 911 and the lower first reflecting portion 913 are formed in a plate shape. An upper first reflecting surface 912 that reflects light is formed on one surface of the upper first reflecting portion 911, and a lower first reflecting surface 914 that reflects light is formed on one surface of the lower first reflecting portion 913. Is formed.

  The upper first reflecting part 911 is directed from the light emitting part 7 toward the light guide part 5 on the upper side in FIG. 3 of the light emitting part 7 along the sides 31 and 32 where the light emitting parts 7 are arranged in parallel. It sticks to the light emission part 7 so that it may protrude. At this time, the surface of the protruding portion on the substrate 3 side is the upper first reflecting surface 912. In addition, the lower first reflecting portion 911 is arranged so that the lower first reflecting surface 914 faces upward in FIG. 3 along the sides 31 and 32 where the light emitting portions 7 are arranged in parallel. It is stuck on the surface between the light guide 5 and the light guide 5.

  The upper first reflecting portion 911 and the lower first reflecting portion 913 are emitted from each light emitting portion 7 in a direction other than the direction toward the incident portion 57 corresponding to the light emitting portion 7 out of the light from the light emitting portion 7. As long as at least part of the emitted light is provided so as to be incident on the incident portion 57, an aspect that is not formed in a plate shape may be used.

  Further, in the present embodiment, the upper first reflecting portion 911 and the lower first reflecting portion 913 are configured by one member on each side so as to be along the sides 31 and 32 where the light emitting unit 7 is arranged in parallel. However, in each light emitting unit 7, at least a part of the light emitted from the light emitting unit 7 in a direction other than the direction toward the incident unit 57 corresponding to the light emitting unit 7 is transmitted to the incident unit 57. As long as it is the aspect provided so that it may inject, the aspect provided separately with respect to each light emission part 7 may be sufficient, for example.

  The upper first reflecting surface 912 is a position between the light emitting portion 7 and the side wall portion 52 in the left-right direction of FIG. 5A, and the light emitting portion 7 (more specifically, the light emitting surface in the vertical direction of FIG. 5A). 71 (center portion of 71) is provided at a position opposite to the substrate 3 (that is, a position on the upper end side of the light emitting portion 7) in parallel with the substrate 3 and toward the lower side of FIG. ing. Thereby, in the light from the light emitting unit 7, a part of the light traveling in the direction other than the direction toward the incident unit 57 corresponding to the light emitting unit 7 is directed to the upper first reflection. The light is reflected by the surface 912 and enters the incident portion 57 corresponding to the light emitting portion 7 (for example, the light guide path R1u in FIG. 5A). As described above, when the light incident on the incident portion 57 increases, the light from the light emitting portion 7 corresponding to the incident portion 57 can be efficiently received by the light receiving portion 8 corresponding to the light emitting portion 7.

  Further, the lower first reflecting surface 914 is a position between the light emitting portion 7 and the side wall portion 52 in the left-right direction in FIG. 5A, and the light emitting surface 71 (in more detail in the up-down direction in FIG. 5A). Is provided at a position on the substrate 3 side (that is, a position on the lower end side of the light emitting portion 7) with respect to the light emitting surface 71) in parallel with the substrate 3 and toward the upper side in FIG. Yes. As a result, a part of the light emitted from the light emitting unit 7 toward the substrate 3 is reflected by the lower first reflecting surface 914 without being absorbed by the substrate 3 and is incident on the incident unit corresponding to the light emitting unit 7. Incident light (for example, the light guide path R1d in FIG. 5A). Therefore, the light incident on the incident portion 57 corresponding to the light emitting portion 7 can be increased. Thereby, the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8 corresponding to the light emitting unit 7.

  In the present embodiment, the upper first reflection surface 912 and the lower first reflection surface 914 are provided in parallel with the substrate 3. The upper first reflecting surface 912 has at least part of the light emitted from each light emitting unit 7 emitted in a direction other than the direction toward the incident unit 57 corresponding to the light emitting unit 7 to the incident unit 57. An aspect that is not provided in parallel with the substrate 3 may be used as long as it is configured to be incident. Further, the lower first reflecting portion 913 is a part of the light from the light emitting portion 7 toward the substrate 3 is reflected by the lower first reflecting portion 913 and enters the incident portion 57 corresponding to the light emitting portion 7. If it is an aspect to do, the aspect which is not provided in parallel with the board | substrate 3 may be sufficient.

  Each light receiving portion 8 is provided with a second reflecting portion 920 that reflects light. The second reflecting unit 920 is light emitted in a direction other than the direction toward the light receiving unit 8 among the light from the light emitting unit 7 corresponding to the light receiving unit 8 guided and emitted by the light guide unit 5. The light receiving unit 8 is configured to receive at least a part of the light.

  Thereby, in each light receiving part 8, at least a part of the light in the direction other than the direction toward the light receiving part 8 in the light from the light emitting part 7 corresponding to the light receiving part 8 emitted from the light guide part 5. Reflected by the second reflecting portion 920, the reflected light can be received by the light receiving portion 8 (see, for example, the light guide paths R2u and R2d in FIG. 5B). Therefore, the light received by the light receiving unit 8 can be increased, and the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8.

  Specifically, the second reflection unit 920 includes an upper second reflection unit 921 and a lower second reflection unit 923. The upper second reflecting portion 921 and the lower second reflecting portion 923 are formed in a plate shape. An upper second reflecting surface 922 that reflects light is formed on one surface of the upper second reflecting portion 921, and a lower second reflecting surface 924 that reflects light is formed on one surface of the lower second reflecting portion 923. Is formed.

  The upper second reflecting portion 921 extends from the light receiving portions 8 toward the light guide portion 5 on the upper side of the light receiving portions 8 in FIG. 3 along the sides 33 and 34 where the light receiving portions 8 are arranged in parallel. It sticks to the light-receiving part 8 so that it may protrude. At this time, the surface of the protruding portion on the substrate 3 side is the upper second reflecting surface 922. Further, the lower second reflecting portion 923 includes the light receiving portion 8 of the substrate 3 such that the lower second reflecting surface 924 faces upward in FIG. 3 along the sides 33 and 34 where the light receiving portions 8 are arranged in parallel. It is stuck on the surface between the light guide 5 and the light guide 5.

  The upper second reflecting portion 921 and the lower second reflecting portion 923 are the light receiving portions of the light from the light emitting portion 7 corresponding to the light receiving portion 8 emitted from the light guide portion 5 in each light receiving portion 8. As long as the light receiving unit 8 is configured to receive at least a part of the light emitted in a direction other than the direction toward 8, the plate may not be formed in a plate shape.

  Further, in the present embodiment, the upper second reflecting portion 921 and the lower second reflecting portion 923 are configured by one member on each side so as to be along the sides 33 and 34 where the light receiving portion 8 is arranged in parallel. However, in each light receiving unit 8, light emitted from the light emitting unit 7 corresponding to the light receiving unit 8 emitted from the light guide unit 5 is emitted in a direction other than the direction toward the light receiving unit 8. As long as at least a part is configured so that the light receiving unit 8 can receive light, for example, a mode provided individually for each light receiving unit 8 may be used.

  The upper second reflecting surface 922 is a position between the light receiving portion 8 and the side wall portion 52 in the left-right direction of FIG. 5B, and the light receiving portion 8 (more specifically, light receiving in the vertical direction of FIG. 5B). The center of the surface 81 is provided at a position opposite to the substrate 3 (that is, a position on the upper end side of the light receiving portion 8) in parallel with the substrate 3 and toward the lower side of FIG. It has been.

  Thereby, in each light receiving part 8, in the light from the light emitting part 7 corresponding to the light receiving part 8 emitted from the light guiding part 5, out of the light in the direction other than the direction toward the light receiving part 8, A part of the light traveling toward the opposite side is reflected by the upper second reflecting surface 922 (see, for example, the light guide path R2u in FIG. 5B), and the light receiving unit 8 receives the reflected light. Can receive light. Therefore, the light received by the light receiving unit 8 can be increased, and the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8.

  Further, the lower second reflecting surface 924 is a position between the light receiving portion 8 and the side wall portion 52 in the left-right direction in FIG. 5B, and the light receiving surface 81 (in more detail in the up-down direction in FIG. 5B). Is provided at a position on the substrate 3 side relative to the center of the light receiving surface 81 (that is, a position on the lower end side of the light receiving portion 8) in parallel with the substrate 3 and toward the upper side in FIG. Yes.

  Thereby, in each light receiving part 8, in the light from the light emitting part 7 corresponding to the light receiving part 8 emitted from the light guide part 5, the light toward the substrate 3 out of the light in the direction other than the direction toward the light receiving part 8. A part of the light is reflected by the lower second reflecting surface 924 without being absorbed by the substrate 3 (see, for example, the light guide path R2d in FIG. 5B). Thus, the light receiving unit 8 can receive the reflected light. Therefore, the light received by the light receiving unit 8 can be increased, and the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8.

  In the present embodiment, the upper second reflecting surface 922 and the lower second reflecting surface 924 are provided in parallel with the substrate 3. The upper second reflecting surface 922 is configured to transmit light emitted from the light emitting unit 7 corresponding to the light receiving unit 8 emitted from the light guide unit 5 in a direction other than the direction toward the light receiving unit 8. An aspect that is not provided in parallel with the substrate 3 may be used as long as at least a part is configured so that the light receiving unit 8 can receive light. Further, the lower second reflecting surface 924 is configured to transmit light emitted from the light emitting unit 7 corresponding to the light receiving unit 8 emitted from the light guide unit 5 in a direction other than the direction toward the light receiving unit 8. An aspect that is not provided in parallel with the substrate 3 may be used as long as at least a part is configured so that the light receiving unit 8 can receive light.

  The bezel 6 is formed in a rectangular frame shape. The bezel 6 covers the side wall 52 of the light guide 5 and the side wall of the chassis 2. At this time, the chassis 2 is fitted in the opening of the bezel 6.

  Further, the bezel 6 is provided with an inclined portion 61 that contacts the inclined surface 53 on the operation surface 511 side of the light guide portion 5. The inclined portion 61 prevents the light guide portion 5 from moving relative to the chassis 2 and the substrate 3 in the upward direction of FIG.

  In addition, the inclined portion 61 is provided with a third reflecting surface 93 that reflects light at a portion in contact with the inclined surface 53 of the bezel 6 so as to go into the light guide portion 5. Thereby, when the light incident from the incident portion 57 is guided to the light receiving portion 8 through the operation portion 51, the light passing between the side wall portion 52 and the operation portion 51 is applied to the inclined surface 53. When incident, the light is reflected by the third reflecting surface 93 (for example, a portion reflected by the third reflecting surface 93 of the light guide path R in FIG. 4). This prevents light passing between the side wall portion 52 and the operation portion 51 from being emitted from the inclined surface 53 to the outside of the light guide portion 5. Therefore, in each light receiving unit 8, the light guided to the light receiving unit 8 can be increased, and the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8.

  For the first reflecting portion 910, the second reflecting portion 920, and the inclined portion 61, resin (for example, polymethyl methacrylate resin, polycarbonate, or polystyrene) or the like is used as a material. Then, by depositing a metal thin film (for example, gold, aluminum and silver alloy) on these resins by vapor deposition or the like, an upper first reflecting surface 912, a lower first reflecting surface 914, an upper second reflecting surface 922, Reflective surfaces such as the lower second reflective surface 924 and the third reflective surface 93 (hereinafter collectively referred to simply as “reflective surfaces”) are formed. At this time, if necessary, a protective film such as silicon oxide may be formed on the metal thin film by vapor deposition or the like.

  The reflective surface may be a white film having a high reflectance such as foamed PET. Furthermore, a highly reflective white resist may be used for the lower first reflecting surface 914 and the lower second reflecting surface 924. Even if the material of the inclined portion 61 is not resin, a metal thin film (for example, gold, aluminum, and silver alloy) is formed on the surface of the inclined portion 61 by vapor deposition or the like, and the third reflecting surface 93 is formed. It may be formed.

  Next, position detection of the position detection device 1 configured as described above will be described.

  In a state where the operation surface 511 is not touched, each light receiving unit 8 receives light from the light emitting unit 7 corresponding to the light receiving unit 8.

  When a predetermined position of the operation surface 511 is touch-operated by a user's finger or the like of the position detection device 1, the predetermined position of the operation surface 511 is in contact with grease attached to the surface of the user's finger. Will do.

  The absolute refractive index of such fat is closer to the absolute refractive index of the plastic forming the light guide portion 5 than the absolute refractive index of air. Therefore, at the position where the finger is in contact with the operation surface 511, the critical angle becomes larger than when the finger is in contact with the oil of the finger. Thereby, the light guided into the light guide unit 5 (operation unit 51) is emitted from the operation surface 511 without being totally reflected at a predetermined position, and is scattered by a user's finger or the like. Accordingly, the light receiving unit corresponding to the light emitting unit 7 that has emitted light scattered without being totally reflected by the predetermined position where the touch operation is performed (hereinafter, such a light receiving unit is referred to as a “light receiving unit corresponding to the touch position”). ) Light received at 8 is reduced.

  In the present embodiment, the light receiving unit 8 in which light received by a predetermined position on the operation surface 511 is touched is reduced, is one of the plurality of light receiving units 8 arranged on the side 33 side of the substrate 3. There are two, one light receiving unit 8 and one of the plurality of light receiving units 8 arranged on the side 34 side of the substrate 3.

  For this reason, the position detection device 1 detects the intersection of the two light guide paths R connecting the two light receiving units 8 and the light emitting units 7 corresponding to the two light receiving units 8 as a touch-operated position. .

  In addition, you may comprise so that the operation surface 511 of the operation part 51 may deform | transform toward this press direction in the vicinity of a predetermined position, when the operation part 51 is pressed by predetermined force or more. In this case, the light guided into the operation unit 51 is emitted without being totally reflected by the operation surface 511 due to the deformation of the operation unit 51 in the vicinity of the predetermined position. The light received by the light receiving unit 8 corresponding to the position decreases.

  In addition, in this embodiment, although it is the aspect in which the 1st reflection part 910 and the 2nd reflection part 920 are provided, even if it is an aspect in which any one of the 1st reflection part 910 and the 2nd reflection part 920 is provided. The effect of the present invention is obtained that the light from the light emitting unit 7 can be efficiently received by the light receiving unit 8 corresponding to the light emitting unit 7.

  Further, in the present embodiment, the first reflecting portion 910 is configured by the upper first reflecting portion 911 and the lower first reflecting portion 913, but the first reflecting portion of the present invention is the upper first reflecting portion. Even if only one of 911 and the lower first reflecting portion 913 is provided, the light from the light emitting portion 7 can be efficiently received by the light receiving portion 8 corresponding to the light emitting portion 7. An effect is obtained.

  In the present embodiment, the second reflecting portion 920 is configured by the upper second reflecting portion 921 and the lower second reflecting portion 923. However, the second reflecting portion of the present invention is the upper second reflecting portion. Even in a mode in which only one of 921 and the lower second reflecting portion 923 is provided, the light from the light emitting portion 7 can be efficiently received by the light receiving portion 8 corresponding to the light emitting portion 7. An effect is obtained.

  In the present embodiment, the third reflective surface 93 is provided. However, even if the third reflective surface is not provided, the light from the light emitting unit 7 corresponds to the light emitting unit 7. The effect of the present invention that light can be efficiently received by the light receiving unit 8 is obtained.

[Second Embodiment]
Next, an optical position detection device (position detection device) according to a second embodiment of the present invention will be described with reference to FIGS.

  The position detection device 101 of the present embodiment is not provided with the first reflecting portion 910 (see FIG. 6), and the incident portion 57 is a concave portion having an arcuate cross section, as compared with the position detection device 1 of the first embodiment. 501 is different (refer to FIGS. 7 and 8).

  The concave portion 501 is centered on a predetermined point (hereinafter referred to as “light emitting point”) 72 in a portion where the light of the light emitting unit 7 corresponding to the incident portion 57 is emitted, and has a radius having a predetermined length (hereinafter referred to as “light emitting point”) It is formed into a virtual spherical partial shape of Br (referred to as “virtual sphere radius”).

  Thereby, the incident angle when the light from the light emitting unit 7 enters the incident unit 57 becomes 0 ° or an angle close to 0 ° (see the light guide path R in FIG. 8). For this reason, the light reflected on the surface of the incident part 57 among the light which goes to the incident part 57 from the light emission part 7 reduces, and the light which injects into the light guide part 5 (side wall part 52) increases. As described above, when the light incident on the incident portion 57 increases, the light from the light emitting portion 7 corresponding to the incident portion 57 can be efficiently received by the light receiving portion 8 corresponding to the light emitting portion 7.

  The light emitting point 72 is defined at, for example, the center point of the light emitting surface 71 of the light emitting unit 7 or the vicinity thereof. The length of the phantom sphere radius Br is defined in advance by experiments or the like so that the light from the light emitting unit 7 can be efficiently guided.

  In the present embodiment, the second reflection unit 920 is provided. However, even if the second reflection unit is not provided, the light from the light emitting unit 7 corresponds to the light emitting unit 7. The effect of the present invention that light can be efficiently received by the light receiving unit 8 is obtained.

  Moreover, in this embodiment, about the structure similar to 1st Embodiment, while the effect similar to 1st Embodiment is acquired, the deformation | transformation aspect similar to 1st Embodiment is applicable.

  DESCRIPTION OF SYMBOLS 1 ... Position detection apparatus (optical position detection apparatus), 3 ... Board | substrate (light emission part mounting substrate and light-receiving part mounting board | substrate), 5 ... Light guide part, 51 ... Operation part, 511 ... Operation surface, 52 ... Side wall part, 521 ... Side wall portion outer surface (surface outside sidewall portion) 53. Inclined surface 57. Incident portion 58 .. Emission portion 7. Light emitting portion 8. Reflector (first reflector), 913 ... lower first reflector (first reflector), 920 ... second reflector, 921 ... upper second reflector (second reflector), 923 ... lower second reflector Part (second reflecting part), 93 ... third reflecting surface, 101 ... position detecting device (optical position detecting device), 501 ... concave portion, 72 ... light emitting point (predetermined point), Br ... virtual sphere radius (predetermined Length radius).

Claims (10)

A plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, an operation surface operated by touch operation, and a plurality of incident units on which light emitted from each of the plurality of light emitting units is incident. And a light guide configured to guide light incident on the incident portion corresponding to the light emitting portion from the light emitting portion to the light receiving portion corresponding to the light emitting portion. A detection device,
A first reflecting part that reflects light is provided for each of the plurality of light emitting parts, and the first reflecting part is other than the direction from the light emitting part toward the incident part corresponding to the light emitting part. An optical position detection device, wherein at least part of the light emitted in the direction of is incident on the incident portion. The optical position detection device according to claim 1,
A light emitting unit mounting substrate on which the plurality of light emitting units are mounted,
The plurality of light emitting units are mounted on the light emitting unit mounting substrate so as to emit light in a surface direction of the light emitting unit mounting substrate,
The first reflecting part is provided at a position opposite to the light emitting part mounting substrate between the light emitting part and the incident part so that the light reflected by the first reflecting part is incident on the incident part. An optical position detection device characterized by the above.   3. The optical position detection device according to claim 2, wherein the first reflecting portion is light reflected by the first reflecting portion at a position on the light emitting portion mounting substrate side between the light emitting portion and the incident portion. Is further provided so as to be incident on the incident portion.   The optical position detection device according to any one of claims 1 to 3, wherein a second reflecting portion that reflects light is provided for each of the plurality of light receiving portions, and the second reflecting portion includes: At least part of the light emitted in a direction other than the direction toward the light receiving part among the light emitted from the light emitting part corresponding to the light receiving part is guided by the light guide part. An optical position detection device configured to receive light at a portion. In the optical position detection device according to claim 4,
A light receiving unit mounting substrate on which the plurality of light receiving units are mounted;
The plurality of light receiving units are mounted on the light receiving unit mounting substrate so as to receive light from the surface direction of the light receiving unit mounting substrate,
The second reflection unit is arranged such that light reflected by the second reflection unit is incident on the light receiving unit at a position opposite to the light receiving unit mounting substrate between the light receiving unit and the light guide unit. An optical position detection device provided.   6. The optical position detection device according to claim 5, wherein the second reflecting portion is reflected by the second reflecting portion at a position on the light receiving portion mounting substrate side between the light receiving portion and the light guiding portion. An optical position detection device, further provided so that light enters the light receiving portion. A plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, an operation surface operated by touch operation, and a plurality of incident units on which light emitted from each of the plurality of light emitting units is incident. And a light guide configured to guide light incident on the incident portion corresponding to the light emitting portion from the light emitting portion to the light receiving portion corresponding to the light emitting portion. A detection device,
The incident part is a concave part having an arc shape in cross section,
The concave portion is formed in a virtual spherical partial shape having a predetermined radius and having a predetermined point as a center in a portion where the light of the light emitting portion corresponding to the incident portion is emitted. An optical position detection device characterized by the above. A plurality of light emitting units, a plurality of light receiving units corresponding to each of the plurality of light emitting units, and an operation surface to be touch-operated, and the light received from the light emitting unit corresponding to the light emitting unit. An optical position detection device comprising a light guide configured to guide light to the unit,
Each of the plurality of light receiving units is provided with a second reflecting unit that reflects light, and the second reflecting unit guides light from the light emitting unit corresponding to the light receiving unit by the light guide unit. An optical position detection device configured so that the light receiving unit can receive at least a part of the light emitted in a direction other than the direction toward the light receiving unit. . The optical position detection device according to claim 8,
In each of the plurality of light emitting portions, the incident portion where the light emitted from the light emitting portion is incident is a concave portion having an arcuate cross section,
The concave portion is formed in a virtual spherical partial shape having a predetermined radius and having a predetermined point as a center in a portion where the light of the light emitting portion corresponding to the incident portion is emitted. An optical position detection device characterized by the above. In the optical position detection device according to any one of claims 1 to 9,
The light guide part includes a plate-shaped operation part including the operation surface, and a side wall part protruding from the operation part toward the opposite side of the operation surface from the operation surface side,
The outer surface of the side wall portion is continuous with a surface including the operation surface among the surfaces of the operation portion through an inclined surface inclined toward the operation surface,
The side wall portion receives light from the light emitting portion on the side of the side wall portion opposite to the operation portion side or guides the incident light from the light guide portion. Configured to emit to the light receiving unit,
3. The optical position detection device according to claim 1, wherein the inclined surface is provided with a third reflecting surface for reflecting light so that the light reflected by the third reflecting surface is directed into the light guide section.