JP2009198421A - Position detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detection device capable of accurately detecting the position of a moving member such as a pointer while reducing the thickness of the entire device with a simple structure.
SOLUTION: A sheet-shaped first light transmission member 22 is provided on a support plate 11, and a first light emitting element 20, a first light receiving element 21, and a circuit board 19 facing the support plate 11 with a train wheel mechanism 6 interposed therebetween. Was established. Therefore, when the first light emitting element 20 is caused to emit light, the light from the first light emitting element 20 is taken from the incident end 22a which is one end of the first light transmission member 22 and guided to the other end. The guided light is emitted toward the hour hand wheel 9 of the gear train mechanism 6 from the emission end portion 22 b which is the other end portion of the first light transmission member 22. For this reason, when the hour hand wheel 9 rotates and the first light transmission hole 15 of the hour hand wheel 9 corresponds to the emission end portion 22 b which is the other end portion of the first light transmission member 22, the first light transmission member 22. The light from the first light emitting element 20 can be received by the first light receiving element 21 through the first and second light receiving elements.
[Selection] Figure 1

Description

  The present invention relates to a position detection device that detects the position of a moving member such as a pointer in a timepiece or an instrument.

For example, in a position detection device that detects the position of a pointer of a watch, as described in Patent Document 1, a light transmission hole is provided in a gear of a gear train mechanism that moves a pointer, and a light emitting element is provided on one surface of the gear. When the irradiated light passes through the light transmission hole of the gear, the transmitted light is received by the light receiving element, thereby detecting the position of the gear and detecting the position of the pointer. What is composed is known.
JP 2006-46924 A

  In such a position detection device, a light emitting element and a light receiving element are provided in parallel on a circuit board provided on the upper side of a case in which a train wheel mechanism for moving a pointer is incorporated, and a light guide path portion is provided in the case. The light emitted from the light emitting element is guided to the lower side of the gear of the gear train mechanism through the light guide path portion of the case, and the gear rotates in this state. When the light transmission hole rotates and the irradiated light is transmitted through the light transmission hole of the gear, the transmitted light is received by the light receiving element provided on the circuit board located on the upper side of the case, The position of the pointer is detected by detecting the position of the gear.

  However, in such a position detection device, if the case is not formed of a transparent resin, the light guide path portion cannot be formed in the case, and when the light guide path portion is formed in the case, the light emitting element emits light. Since it is necessary to guide light to the lower side of the gear of the gear train mechanism and irradiate the lower surface of the gear, the structure of the light guide path is complicated, and the light guide efficiency of the light guide path is poor, and the light emitting element If the light emission luminance is not sufficiently increased, there is a problem that the light from the light emitting element cannot be reliably received by the light receiving element, and the position of the gear cannot be accurately detected.

  In order to solve such a problem, in the conventional position detecting device, the light emitting element and the light receiving element are arranged to face each other with the gear of the gear train mechanism interposed therebetween, and the light from the light emitting element is directly transmitted to the gear. The gear rotates in this state, and the light transmission hole of the gear rotates as the gear rotates. When the irradiated light passes through the light transmission hole of the gear, the transmitted light is received. A device configured to receive light with an element has also been developed.

  However, in such a position detection device, since the light emitting element and the light receiving element must be arranged to face each other with the gear of the train wheel mechanism interposed therebetween, it is necessary to provide the light emitting element and the light receiving element on separate circuit boards. For this reason, there is a problem that not only the thickness of the entire apparatus is increased, but also the number of parts is increased and the assembling work becomes complicated.

  The problem to be solved by the present invention is to provide a position detection device that can easily detect the position of a moving member such as a pointer while reducing the thickness of the entire device with a simple structure.

In order to solve the above problems, the present invention includes the following components.
The invention according to claim 1 is a support member, a movable member provided so as to be movable with respect to the support member, and provided with a light transmitting portion at a predetermined position, and opposed to the support member across the movable member. A circuit board disposed on the circuit board, a light emitting element provided on the circuit board for emitting light toward the support member, and a light provided on the circuit board for receiving light from the support member side The light receiving element and one end thereof are opposed to one of the light emitting element and the light receiving element corresponding to the movement trajectory of the light transmitting portion of the moving member, and the other end is located outside the moving region of the moving member. The light-emitting element and the light-receiving element are provided on the support member in a state of being opposed to the other, and the light from the light-emitting element is taken from one end and guided to the other end. Directed light from the other end toward the light receiving element It and a sheet-like optical transmission member to output a position detecting device according to claim.

  According to a second aspect of the present invention, the light receiving element is disposed to face the one end portion of the light transmission member corresponding to a movement locus of the light transmitting portion of the moving member, and the light emitting element is The position detection device according to claim 1, wherein the position detection device is disposed so as to face the other end portion of the optical transmission member located outside the moving region of the moving member.

  According to a third aspect of the present invention, the light emitting element is disposed to face the one end portion of the light transmission member corresponding to a movement locus of the light transmitting portion of the moving member, and the light receiving element is The position detection device according to claim 1, wherein the position detection device is disposed so as to face the other end portion of the optical transmission member located outside the moving region of the moving member.

  The invention according to claim 4 is characterized in that the light transmission member is formed in a sheet shape by providing a plurality of light guide paths in parallel in the sheet member. It is a position detection device.

  According to a fifth aspect of the present invention, light emitted to one surface of the sheet member by the light emitting element is taken into the light guide path at one end of the light guide and directed toward the other end of the light guide. A first reflecting portion that reflects the light and is reflected at the other end portion of the light guide path by the light reflected by the first reflection section and guided by the light guide path with respect to the one surface of the sheet member. The position detecting device according to claim 4, further comprising a second reflecting portion configured to reflect substantially vertically and irradiate the light receiving element.

  According to a sixth aspect of the present invention, in the state where the one end portions of the plurality of light guide paths are positioned in an irradiation region where the light from the light emitting element is irradiated onto the sheet member, The position detecting device according to claim 4 or 5, wherein lengths in a longitudinal direction are different in the irradiation region.

  In the invention according to claim 7, the one end portions of the plurality of light guide paths are provided so as to be concentrated toward a central portion in an irradiation region where the light from the light emitting element is irradiated onto the sheet member. The position detection device according to claim 4, wherein:

  According to the present invention, when the light emitting element provided on the circuit board facing the support member across the moving member emits light, the light from the light emitting element is taken in from one end of the optical transmission member and the other When the guided light is emitted from the other end of the light transmission member, the light transmitting portion of the moving member moves and moves on the support member as the moving member moves. When it corresponds to the end portion of the light transmission member, light from the light emitting element can be irradiated to the light receiving element provided on the circuit board via the light transmission member and received by the light receiving element.

  For this reason, a sheet-like light transmission member is provided on the support member, and the light-emitting element and the light-receiving element are provided on the circuit board facing the support member with the moving member interposed therebetween. When the light transmitting part of the moving member corresponds to the end of the light transmission member, the light transmission element irradiates the light receiving element with the light transmission member and receives the light from the light receiving element. Therefore, the position of the moving member can be accurately detected.

(Embodiment 1)
Hereinafter, a first embodiment in which the position detection device of the present invention is applied to a pointer-type wristwatch will be described with reference to FIGS.
This pointer-type wristwatch includes a wristwatch case K as shown in FIG. A bezel B is provided on the upper outer periphery of the watch case K, and a watch glass G is attached to the upper opening of the watch case K. A back cover F is attached to the lower part of the watch case K.

  A watch movement 1 is disposed in the watch case K. The timepiece movement 1 indicates the time by moving the hands 5 such as the second hand 2, the minute hand 3, and the hour hand 4, and a train wheel mechanism 6 for transmitting the rotation of a step motor (not shown) to the hands 5. I have. As shown in FIG. 1, the train wheel mechanism 6 is a second wheel 7 that is a fourth wheel that moves the second hand 2, a minute wheel 8 that is a second wheel that moves the minute hand 3, and a hour wheel that moves the hour hand 4. There are provided various gears such as an intermediate wheel 10 that rotates in mesh with the hour hand wheel 9 and the minute hand wheel 8.

  In this case, a support plate 11 as a support member is disposed on the upper side of the train wheel mechanism 6. The support plate 11 is disposed in the wristwatch case K in a state of being located above the train wheel mechanism 6 and below the pointer 5. A solar panel 12 that receives external light and generates electric power is disposed on the upper surface of the support plate 11, and a transparent or translucent dial 13 is disposed on the upper surface of the solar panel 12. A through-hole 14 through which the cylindrical shaft 9a of the hour hand wheel 9 is inserted is provided in a substantially central portion of the support plate 11, the solar panel 12, and the dial 13 so as to penetrate vertically.

  That is, as shown in FIG. 1, the hour hand wheel 9 of the train wheel mechanism 6 is a hour wheel, and its cylinder shaft 9a is rotatably inserted into the through hole 14 from the lower side of the support plate 11 so that the dial 13 The hour hand 4 protrudes upward, and the hour hand 4 is attached to the protruding upper end portion. The hour hand 4 is configured to be moved above the dial 13. The minute hand wheel 8 has a pipe-shaped minute hand shaft 8a. The minute hand shaft 8a is rotatably inserted into the tube shaft 9a of the hour hand wheel 9 and protrudes above the tube shaft 9a. 3 is attached, and the minute hand 3 is moved above the dial 13.

  Similarly, as shown in FIG. 1, the second hand wheel 7 has a round bar-like second hand shaft 7a, and this second hand shaft 7a is rotatably inserted into the minute hand shaft 8a of the minute hand wheel 8 so as to be located above the minute hand shaft 8a. The second hand 2 is attached to the protruding upper end, and the second hand 2 is configured to be moved above the dial 13. In this case, the hour hand wheel 9 is provided with a first light transmission hole 15 located on a rotational movement locus of a portion that does not overlap with the minute hand wheel 8 and the second hand wheel 7. Further, in the intermediate wheel 10 that meshes with the minute hand wheel 8 and rotates, the second light transmission hole 16 is provided on a rotational movement locus at a position that does not overlap with the hour hand wheel 9 and the second hand wheel 7.

  By the way, the timepiece movement 1 includes first and second position detecting devices 17 and 18 for detecting the position of the pointer 5, as shown in FIG. That is, the first position detection device 17 detects the position of the hour hand 4 by detecting the rotational position of the hour hand wheel 9. The second position detecting device 18 detects the position of the minute hand 3 by detecting the rotational position of the intermediate wheel 10 that meshes with the minute hand wheel 8 and rotates. In this case, one circuit board 19 common to the first and second position detection devices 17 and 18 is disposed below the train wheel mechanism 6 so as to face the support plate 11 with the train wheel mechanism 6 interposed therebetween. Has been.

  As shown in FIG. 1, the first position detection device 17 is provided on the circuit board 19 with a first light emitting element 20 provided on the circuit board 19 and a distance from the first light emitting element 20. A first light receiving element 21 and a first light transmission member 22 provided on the lower surface of the support plate 11 and corresponding to the first light emitting element 20 and the first light receiving element 21 are provided.

  The first light emitting element 20 is formed of a light emitting diode (LED), a semiconductor laser, or the like, and is provided at a position on the circuit board 19 located outside the outer periphery of the hour hand wheel 9 outside the rotation region of the hour hand wheel 9, In this state, the light is emitted toward the lower surface side of the support plate 11. The first light receiving element 21 is made of a photocoupler, and is provided at a location on the circuit board 19 corresponding to the movement locus of the first light transmission hole 15 of the hour hand wheel 9. In this state, the light from the support plate 11 side, That is, when light from the first light transmission member 22 provided on the support plate 11 is irradiated through the first light transmission hole 15 of the hour hand wheel 9, the light is received and an electric signal is output. It is configured.

  The first light transmission member 22 is formed in an elongated sheet shape as shown in FIGS. 1 to 3, and guides light from one end to the other end. One end (in FIGS. 1 to 3) The right end portion is formed at an incident end portion 22a that takes in light, the incident end portion 22a corresponds to the first light emitting element 20, and the other end portion (left end portion in FIGS. 1 to 3) emits light. The light emitting end 22b is formed on the end 22b, corresponds to the first light receiving element 21, and is provided on the lower surface of the support plate 11 in this state.

  That is, the first light transmission member 22 corresponds to the first light emitting element 20 with the incident end portion 22a, which is one end portion thereof, located outside the outer periphery of the hour hand wheel 9 outside the rotation region of the hour hand wheel 9. The emission end portion 22b, which is the other end portion, is arranged in a state of facing the first light receiving element 21 corresponding to the movement locus of the first light transmission hole 15 of the hour hand wheel 9. Accordingly, the first light transmission member 22 takes light from the first light emitting element 20 at the incident end 22a at one end, guides the taken light to the emission end 22b at the other end, and guides the light. The emitted light is emitted toward the first light receiving element 21 from the emission end 22b at the other end.

  In this case, as shown in FIGS. 3 to 6, the first light transmission member 22 has a configuration in which a plurality of light guide paths 24 are integrally formed on the sheet member 23. That is, the sheet member 23 includes a lower clad 23a and an upper clad 23b as shown in FIG. 6 (b). The light guide path 24 is a core for guiding light, and is provided in parallel between the lower clad 23a and the upper clad 23b of the sheet member 23 as shown in FIGS. 6 (a) and 6 (b). Yes. That is, the light guide path 24 is made of a photosensitive epoxy resin, and is patterned on the lower clad 23a in a line shape having a square cross section and covered with the upper clad 23b.

  For example, as shown in FIGS. 6A and 6B, the first optical transmission member 22 has a sheet member 23 having a length S of about 25 mm, a width W of about 9 mm, and a thickness T. Is formed in a linear shape having a length H of about 0.05 mm on each side in the light guide path 24 having a quadrangular cross section, and the pitch P is formed in about 0.3 mm and adjacent to each other. The light guide paths 24 are separated from each other by the upper clad 23b.

  In this case, one end of the light guide 24, that is, one end located at the incident end 22a of the first light transmission member 22 is provided on one surface (the lower surface in FIG. 4) as shown in FIGS. ) Is provided in the light guide path 24, and is reflected toward the other end side of the light guide path 24. In addition, the light reflected by the first reflecting portion 24 a and guided by the light guide 24 at the other end of the light guide 24, that is, the other end located on the emission end 22 b side of the first light transmission member 22. Is provided with a second reflecting portion 24b that reflects substantially vertically downward with respect to one surface (the lower surface in FIG. 4) of the sheet member 23.

  The first reflecting portion 24a is formed on one surface of the sheet member 23 by notching one end portion (right end portion in FIG. 4) of the light guide path 24 at an angle of approximately 45 degrees with respect to one surface (lower surface in FIG. 4). The light that is incident substantially perpendicularly from the lower side is reflected substantially at right angles toward the light guide 24 and is taken into the light guide 24. Further, the second reflecting portion 24b is formed by notching the other end portion (left end portion in FIG. 4) of the light guide path 24 at an angle of approximately 45 degrees with respect to one surface (lower surface in FIG. 4) of the sheet member 23. The light guided at 24 is configured to be reflected and emitted substantially vertically downward with respect to one surface of the sheet member 23.

  Further, as shown in FIG. 5, each end portion of the plurality of light guide paths 24 positioned on the incident end portion 22 a side of the first light transmission member 22 is irradiated with light from the first light emitting element 20 to the sheet member 23. The longitudinal lengths of the respective one end portions are provided differently in the irradiation region 25 in a state of being located in the irradiation region 25. For example, each of the five first reflecting portions 24a located at each one end of the plurality of light guide paths 24 has the third longest projection in the middle and is located on the right end portion side in the irradiation region 25, and is first on both the upper and lower sides. And the fifth project the next longest and are located in the middle of the left and right in the irradiation region 25, and the second and fourth between them project the shortest and are located on the left end side in the irradiation region 25 Yes.

  As a result, the five first reflecting portions 24a positioned at the respective one end portions of the plurality of light guide paths 24 are arranged along the inner circumference of the irradiation region 25 as shown in FIG. Further, each other end portion of the plurality of light guide paths 24 (that is, the end portion located on the emission end portion 22b side of the first light transmission member 22) is not shown, but similarly to the first reflection portion 24a, the first light receiving element. In the state located in the substantially circular emission region corresponding to 21 light receiving regions, the lengths of the other end portions in the longitudinal direction are provided differently in the emission region. That is, the second reflecting portion 24b located at each other end of the plurality of light guide paths 24 is in a substantially circular emission region corresponding to the light receiving region of the first light receiving element 21, similarly to the first reflecting portion 24a. It is desirable to arrange | position along the inner periphery circle.

  On the other hand, the second position detection device 18 is provided on the circuit board 19 a little apart from the second light emitting element 30 provided on the circuit board 19 and the second light emitting element 30 similarly to the first position detection apparatus 17. And a second light transmission member 32 provided on the lower surface of the support plate 11 and corresponding to the second light receiving element 30 and the second light receiving element 31. The second light emitting element 30 has the same configuration as the first light emitting element 20 and is on the circuit board 19 located outside the outer periphery of the intermediate wheel 10 that is outside the rotation region of the intermediate wheel 10 that meshes with the minute hand wheel 8 and rotates. It is provided in the place.

  The second light receiving element 31 has the same configuration as the first light receiving element 21 and is provided at a position on the circuit board 19 corresponding to the movement locus of the second light transmission hole 16 of the intermediate wheel 10. Further, the second light transmission member 32 is configured in the same manner as the first light transmission member 22, the incident end 32 a that is one end corresponds to the second light emitting element 30, and the emission end 32 b that is the other end. It is provided on the lower surface of the support plate 11 in a state corresponding to the second light receiving element 31.

  Next, the case where the position of the hour hand 4 is detected by the first position detection device 17 among the first and second position detection devices 17 and 18 will be described. In the first position detection device 17, the position of the hour hand 4 is detected by detecting the position of the hour hand wheel 9 that moves the hour hand 4. At this time, when the first light emitting element 20 is caused to emit light, the light is irradiated to the light incident end portion 22a which is one end portion of the first light transmission member 22, and the emitted light is irradiated to each of the first light transmission members 22. The light enters the light guide 24 and is guided to the other end portion side of the first light transmission member 22.

  That is, when the light from the first light emitting element 20 is irradiated to the incident end 22 a that is one end of the first light transmission member 22, the irradiated light is provided at each one end of each light guide path 24. Then, the light is reflected by the first reflecting portion 24 a and taken into the light guide path 24. The taken light is guided to each other end side by each light guide path 24 and emitted from the emission end portion 22 b side which is the other end portion of the first light transmission member 22. That is, the light guided by each light guide path 24 is reflected by the second reflecting portion 24 b provided at the other end of each light guide path 24 and reflected substantially vertically downward with respect to one surface of the sheet member 23.

  This reflected light is applied to the upper surface of the hour hand wheel 9. In this state, the hour hand wheel 9 rotates, and with the rotation of the hour hand wheel 9, the first light transmission hole 15 of the hour hand wheel 9 rotates and moves, and the emission end which is the other end portion of the first light transmission member 22. Corresponding to the portion 22 b, the light emitted from the emission end portion 22 b of the first light transmission member 22 passes through the first light transmission hole 15 and is irradiated to the first light receiving element 21. Thereby, since the 1st light receiving element 21 receives the light which permeate | transmitted the 1st light transmission hole 15, the position of the hour hand wheel 9 can be detected and the position of the hour hand 4 can be detected.

  On the other hand, when the position of the minute hand 3 is detected by the second position detection device 18, the second light emitting element 30 is caused to emit light as in the first position detection device 17. Then, the light is irradiated to the incident end portion 32a which is one end portion of the second light transmission member 32, and the irradiated light is taken into each light guide path 24 of the second light transmission member 32, and this pickup is performed. The light thus led is guided to the other end side by each light guide path 24 and is emitted from the emission end portion 32 b which is the other end portion of the second optical transmission member 32. The light emitted from the light emitting end portion 32 b of the second light transmission member 32 is irradiated on the upper surface of the intermediate wheel 10 that meshes with the minute hand wheel 8 and rotates.

  In this state, the intermediate wheel 10 rotates, and with the rotation of the intermediate wheel 10, the second light transmission hole 16 of the intermediate wheel 10 rotates and moves, and the emission end which is the other end portion of the second light transmission member 32. Corresponding to the portion 32 b, the light emitted from the emission end portion 32 b passes through the second light transmission hole 16 and is irradiated to the second light receiving element 31. Thereby, since the second light receiving element 31 receives the light transmitted through the second light transmission hole 16, the position of the minute hand 3 is detected by detecting the position of the intermediate wheel 10 and detecting the position of the minute hand wheel 8. Can be detected.

  Thus, of the first and second position detection devices 17 and 18, the first position detection device 17 is provided on the circuit board 19 that faces the support plate 11 with the train wheel mechanism 6 interposed therebetween. When the first light emitting element 20 is caused to emit light, the light is taken from the incident end portion 22a which is one end portion of the first light transmission member 22 provided on the lower surface of the support plate 11, and is emitted on the other end side. The guided light is guided to the end 22b side, and the guided light is emitted from the emitting end 22b, which is the other end of the first optical transmission member 22, toward the hour hand wheel 9 of the train wheel mechanism 6, thereby causing an hour hand wheel. When the first light transmission hole 15 of the hour hand wheel 9 rotates and moves with the rotation of 9 and corresponds to the emission end portion 22b which is the other end portion of the first light transmission member 22, the first light transmission member 22 The first light receiving element 21 provided on the circuit board 19 is irradiated with the light emitted from the emission end 22b. Since bets can, can receive light emitted by the first light emitting element 20 through the first optical transmission member 22 by the first light receiving element 21.

  For this reason, according to the first position detection device 17, the sheet-shaped first light transmission member 22 is provided on the support plate 11, and the first light emission is performed on the circuit board 19 that faces the support plate 11 with the hour hand wheel 9 interposed therebetween. Since only the element 20 and the first light receiving element 21 are provided, the structure is simple, the entire apparatus can be thinned, and the first light transmission hole 15 of the hour hand wheel 9 is provided with the first light transmission. When corresponding to the emission end 22 b which is the other end of the member 22, the light from the first light emitting element 20 is irradiated to the first light receiving element 21 by the first light transmission member 22 and received by the first light receiving element 21. As a result, the position of the hour hand wheel 9 can be detected and the position of the hour hand 4 can be accurately detected.

  Further, according to the second position detection device 18, similarly to the first position detection device 17, when the second light emitting element 30 provided on the circuit board 19 facing the support plate 11 with the train wheel mechanism 6 interposed therebetween is caused to emit light. The light is taken in from the incident end 32a which is one end of the second optical transmission member 32 provided on the lower surface of the support plate 11, and is guided to the emission end 32b which is the other end. The emitted light is emitted from the emission end portion 32b, which is the other end portion of the second light transmission member 32, toward the intermediate wheel 10 that rotates while meshing with the minute hand wheel 8 of the gear train mechanism 6. When the second light transmission hole 16 of the intermediate wheel 10 rotates and moves with the rotation and corresponds to the emission end 32b which is the other end of the second light transmission member 32, the emission end of the second light transmission member 32 is obtained. The light emitted from the part 32 b is irradiated onto the second light receiving element 31 provided on the circuit board 19. Since it is possible to, it can receive light emitted by the second light emitting element 30 through the second optical transmission member 32 in the second light receiving element 31.

  Therefore, also in the second position detection device 18, the sheet-like second light transmission member 32 is provided on the support plate 11, and the second light emitting element is provided on the circuit board 19 that faces the support plate 11 with the intermediate wheel 10 interposed therebetween. 30 and the second light receiving element 31 are simply provided, the structure is simple, the entire apparatus can be thinned, and the second light transmission hole 16 of the intermediate wheel 10 is the second light transmission member. When the light emitting element 32 corresponds to the light emitting end 32 b that is the other end of the light emitting element 32, the light from the second light emitting element 30 is irradiated to the second light receiving element 31 by the second light transmission member 32 and received by the second light receiving element 31. Therefore, the position of the minute hand 3 can be accurately detected by detecting the position of the intermediate wheel 10 and detecting the position of the minute hand wheel 8 rotated by the intermediate wheel 10.

  In this case, since each of the first and second light transmission members 22 and 32 is formed in a sheet shape by providing a plurality of light guide paths 24 in parallel in the sheet member 23, the first and second light transmission members 22 and 32 are provided on the lower surface of the support plate 11. However, it is possible to reduce the thickness of the entire apparatus without interfering with the train wheel mechanism 6. That is, each of the first and second optical transmission members 22 and 32 has a sheet member 23 having a length S of about 25 mm, a width W of about 9 mm, and a thickness T of about 0.1 mm. Since the length H of each side of the rectangular light guide 24 is approximately 0.05 mm, the thickness T of each of the first and second light transmission members 22 and 32 is small. Each of the second optical transmission members 22 and 32 can be formed in a compact manner, whereby further reduction in thickness and size of the entire apparatus can be achieved.

  In addition, light irradiated on one surface of the sheet member 23 by the first and second light emitting elements 20 and 30 is guided to one end portion of the light guide path 24 of each of the first and second light transmission members 22 and 32. A first reflecting portion 24a that is taken into the optical path 24 and reflects toward the other end side of the light guide path 24 is provided, and the other end portion of the light guide path 24 is reflected by the first reflecting portion 24a. And a second reflecting portion 24b for reflecting the light guided by the light guide path 24 substantially vertically downward with respect to one surface of the sheet member 23 and irradiating the first and second light receiving elements 21 and 31 with each other. As a result, the light emitted from each of the first and second light emitting elements 20 and 30 can be efficiently taken into the light guide 24 by the first reflector 24a and guided. The light is reflected by the second reflecting portion 24b and efficiently applied to the first and second light receiving elements 21 and 31. It is possible to Isa.

  Furthermore, the light from each of the first and second light emitting elements 20 and 30 is irradiated on each sheet member 23 at each end of each light guide path 24 of each of the first and second light transmission members 22 and 32. The first light emission and the second light emission emitted in the irradiation region 25 are provided in the irradiation region 25 because the lengths in the longitudinal direction of the respective one end portions are different in the irradiation region 25 while being positioned in the irradiation region 25. Light from the elements 20 and 30 can be efficiently taken into each light guide path 24 from each end of each light guide path 24. For this reason, even if the luminance of each of the first and second light emitting elements 20 and 30 is suppressed to be low by a low voltage circuit to reduce power consumption, light can be efficiently taken into each light guide path 24.

  That is, each of the five first reflecting portions 24a located at each one end of the plurality of light guide paths 24 has the third longest projection in the middle and is located on the right end portion side in the irradiation region 25, and is first on both the upper and lower sides. And the fifth project the next longest and are located in the middle of the left and right in the irradiation region 25, and the second and fourth between them project the shortest and are located on the left end side in the irradiation region 25. Thus, since the light is disposed along the inner circumference in the irradiation region 25, the light irradiated in the irradiation region 25 can be taken into each light guide path 24 almost evenly.

  In this case, the second reflecting portion 24b located on the other end side of each light guide path 24 also substantially corresponds to each light receiving region of each of the first and second light receiving elements 21 and 31, like the first reflecting portion 24a. In the state where it is located in the circular emission region, the longitudinal position of each of the other end portions is provided differently in the emission region, so that light can be emitted almost uniformly in the substantially circular emission region. Can be released. For this reason, the first and second light receiving elements 21 and 31 can be irradiated with light almost evenly, so that the first and second light receiving elements 21 and 31 can receive light well. . Also by this, even if the luminance of each of the first and second light emitting elements 20 and 30 is suppressed to be low by a low voltage circuit and the power consumption is reduced, the first and second light receiving elements 21 are efficiently emitted. , 31 can be irradiated.

  In the first embodiment, the five first reflecting portions 24a positioned at the respective one end portions of the plurality of light guide paths 24 in the first and second light transmission members 22 and 32 are the third in the middle. It protrudes long and is located on the right end side in the irradiation region 25, and the first and fifth sides on both sides of the upper and lower sides protrude next long and are located in the middle of the left and right in the irradiation region 25, and the second between these Although the fourth is the shortest projecting and located on the left end side in the irradiation region 25, the case where the fourth is arranged along the inner circumferential circle in the irradiation region 25 has been described. You may comprise like the 1st-3rd modification shown to 7 (a)-FIG.7 (c).

  That is, in the first modified example shown in FIG. 7A, the five first reflecting portions 24a positioned at the respective one end portions of the plurality of light guide paths 24 in the light transmission member 35 are set as the first on both the upper and lower sides. The fifth is the longest protruding and is located on the right side in the irradiation region 25, the middle third is the next longest protruding and is located at the approximate center in the irradiation region 25, and the second and fourth between these Projecting shortest and positioned on the left end side in the irradiation region 25, it is arranged at different positions in the irradiation region 25. Also in such a first modified example, the light irradiated in the irradiation region 25 can be taken into each light guide path 24 efficiently.

  Moreover, in the 2nd modification shown by FIG.7 (b), the 5 1st reflection parts 24a located in each one end part of the some light guide 24 in the optical transmission member 35 are the 3rd in the middle most. It protrudes long and is located on the right end side in the irradiation area 25, and the second and fourth positions located on both upper and lower sides thereof protrude long and are located approximately in the middle on the left and right in the irradiation area 25, and on the outside thereof. The first and fifth positions that are positioned are the shortest and are located on the left end side in the irradiation area 25, so that they are arranged at different positions in the irradiation area 25. Also in such a second modified example, the light irradiated into the irradiation region 25 can be taken into each light guide path 24 efficiently.

  Further, in the third modified example shown in FIG. 7C, each end portion of the plurality of light guide paths 24 in the light transmission member 35 is formed with the same length in the longitudinal direction, so that 5 Each of the first reflecting portions 24 a is arranged in a linear shape in a direction orthogonal to the longitudinal direction of the sheet member 23 in the irradiation region 25. Also in the third modified example, the light irradiated in the irradiation region 25 can be favorably taken into each light guide path 24.

  In this case, each of the other end portions of the plurality of light guide paths 24 in the light transmission member 35 (that is, the end portion of the light guide path 24 located on the second reflecting portion 24b side) is not shown, but the first to third modifications. As in the example, the length in the longitudinal direction of each of the other end portions is within the emission region in a state of being located in the substantially circular emission region corresponding to each of the light receiving regions of the first and second light receiving elements 21 and 31. The configuration may be differently provided. That is, the 2nd reflection part 24b located in each other end part of the some light guide path 24 is each 1st, 2nd light receiving element similarly to each 1st reflection part 24a in each 1st-3rd modification. A configuration may be adopted in which the light emitting areas 21 and 31 are arranged at different positions in the substantially circular emission areas corresponding to the light receiving areas.

  In the first embodiment and the first to third modifications, the first and second light transmission members 22, 32, and 35 have a plurality of light guide paths 24 on the sheet member 23 with a predetermined pitch P. Although the case where the structure is formed integrally at intervals has been described, the present invention is not limited thereto, and the cross-sectional shapes of the plurality of light guide paths 37 are formed to be small like the light transmission member 36 of the fourth modification shown in FIG. In addition, the pitch P1 may be shortened.

  That is, in the light transmission member 36 of the fourth modification shown in FIG. 8, after the light guide layer is formed on the lower clad 38a of the sheet member 38 and a plurality of grooves are formed in the light guide layer, the plurality of light transmission members 36 are formed. By forming the upper clad 38b in the groove and on the upper surface of the light guide layer, a plurality of light guide paths 37 are formed in the sheet member 38. In this case, the upper clad 38b provided in each groove of the light guide layer does not reach the upper surface of the lower clad 38a, and a slight gap may be provided. Such an optical transmission member 36 is formed such that the length H1 of each side of the light guide path 37 is about 0.015 mm and the pitch P1 is about 0.02 mm.

  Thereby, in the light transmission member 36 of the fourth modified example, a large number of light guide paths 37 can be formed close to the sheet member 38, so that the lighting efficiency and the light guide efficiency can be increased as compared with the first embodiment. In addition, since the length H1 of one side in the height direction of the light guide path 37 is significantly shorter than the length H of each side in the light guide path 24 of the first embodiment, the thickness T1 of the sheet member 38 is set to the sheet member of the first embodiment. Therefore, the thickness can be made much thinner than that of the first embodiment.

  Further, in the first embodiment and the first to fourth modifications thereof, one end portion of the plurality of light guide paths 24 in the first and second light transmission members 22, 32, 35, and 36 is applied to the irradiation region 25. Although the case where it is the structure extended linearly in was described, it is not restricted to this, For example, as shown in the 5th modification shown in FIG. 9, the one end part of each light guide path 24 is the center part in the irradiation area | region 25. The structure which concentrated and provided radially toward the side may be sufficient.

  That is, in the optical transmission member 40 of the fifth modified example shown in FIG. 9, the one end side of the light guide path 24 approaching the outer periphery of the irradiation region 25 is guided radially toward the center in the irradiation region 25. One end portion of the light guide path 24 guided radially is arranged along the circumference of a small circle 25 a located on the center side of the irradiation region 25. In the optical transmission member 40 of the fifth modified example, light can be taken in more efficiently than in the first embodiment.

  In the first embodiment and the first to fifth modifications thereof, the first and second light emitting elements 20 and 30 and the first and second light emitting elements 20 and 30 in the first and second position detection devices 17 and 18 are used. The case where the two light receiving elements 21 and 31 are provided on the circuit board 19 in a state of being slightly separated from each other has been described. However, the present invention is not limited to this. For example, as shown in a sixth modification shown in FIG. A configuration in which a light shielding wall 41 is provided between the first light emitting element 20 and the first light receiving element 21 in the position detection device 17 may be employed.

  As described above, if the light shielding wall 41 is provided between the first light emitting element 20 and the first light receiving element 21 in the first position detection device 17, the light emitted from the first light emitting element 20 is directly reflected on the first light receiving element 21. Therefore, the position of the hour hand 4 can be more accurately detected. In this case, it is desirable that the light shielding wall 41 is also provided between the second light emitting element 30 and the second light receiving element 31 in the second position detecting device 18, as shown in FIG.

  Further, in the first embodiment and the first to sixth modifications thereof, the first optical transmission unit is provided outside the rotational movement region of the hour hand wheel 9 when the first optical transmission member 22 is provided on the lower surface of the support plate 11. The incident end portion 22a which is one end portion of the second hand 22 is made to correspond, and the emission end portion 22b which is the other end portion of the first light transmission member 22 is positioned on the movement locus of the first light transmission hole 15 of the hour hand wheel 9 In the above description, the first optical transmission member 22 is formed short and provided on the lower surface of the support plate 11. However, the present invention is not limited to this, and the optical transmission member 42 is elongated as in the seventh modification shown in FIG. It may be formed.

  That is, the light transmission member 42 of the seventh modified example has the emission end 42b, which is the other end (right end in FIG. 11), corresponding to the movement locus of the first light transmission hole 15 of the hour hand wheel 9, The incident end 42a, which is the one end (by the left end in FIG. 11), is led to a position located on the opposite side of the through hole 14 located substantially at the center of the support plate 11. The configuration is such that 42 a is provided on the lower surface of the support plate 11 in a state of being far away from the hour hand wheel 9.

  With this configuration, the first light emitting element 20 can be separated from the first light receiving element 21, so that the first light emitting element 20 emits light without providing the light shielding wall 41 as in the sixth modification. Thus, it is possible to surely prevent the first light receiving element 21 from being directly irradiated with the light. Such an optical transmission member 42 can also be applied to the second position detection device 18.

(Embodiment 2)
Next, with reference to FIG. 12, a second embodiment of the pointer type wristwatch to which the position detecting device of the present invention is applied will be described. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
In this wristwatch, the installation positions of the first and second light emitting elements 52 and 54 and the first and second light receiving elements 53 and 55 in the first and second position detecting devices 50 and 51 are embodiments. The configuration is different from that of the first embodiment, and the other configuration is substantially the same as that of the first embodiment.

  That is, of the first and second position detection devices 50 and 51, the first position detection device 50 is a circuit in which the first light emitting element 52 corresponds to the movement locus of the first light transmission hole 15 of the hour hand wheel 9. The first light receiving element 53 is provided at a location on the circuit board 19 and is provided at a location on the circuit board 19 located outside the rotational movement region of the hour hand wheel 9. In this case, the first light transmission member 22 is provided on the lower surface of the support plate 11 as in the first embodiment, and the incident end 22a, which is one end thereof, corresponds to the first light emitting element 52, and the other end. A certain emitting end 22 b is configured to correspond to the first light receiving element 53.

  Similarly, the second position detection device 51 is provided at a position on the circuit board 19 corresponding to the movement locus of the second light transmission hole 16 of the intermediate wheel 10 in which the second light emitting element 54 is rotated by meshing with the minute hand wheel 8. The second light receiving element 55 is provided at a position on the circuit board 19 located outside the rotational movement region of the intermediate wheel 10. Also in this case, the second optical transmission member 32 is provided on the lower surface of the support plate 11 as in the first embodiment, and the incident end portion 32a which is one end thereof corresponds to the second light emitting element 54 and the other end. The emission end portion 32 b which is a portion is configured to correspond to the second light receiving element 55.

  Next, the case where the position of the hour hand 4 is detected by the first position detection device 50 among the first and second position detection devices 50 and 51 will be described. As in the first embodiment, the first position detecting device 50 detects the position of the hour hand 4 by detecting the position of the hour hand wheel 9 that moves the hour hand 4. At this time, when the first light emitting element 52 is caused to emit light, the light is directly applied to the lower surface of the hour hand wheel 9.

  In this state, the hour hand wheel 9 rotates, and when the hour hand wheel 9 rotates, the first light transmitting hole 15 of the hour hand wheel 9 rotates and corresponds to the first light emitting element 52. Is transmitted through the first light transmission hole 15 of the hour hand wheel 9 and is applied to the incident end 22 a which is one end of the first light transmission member 22. Then, the irradiated light is taken into each light guide path 24 of the first light transmission member 22. That is, when the light from the first light emitting element 52 is applied to the incident end portion 22 a of the first light transmission member 22, the irradiated light is provided in each end portion of each light guide path 24. The light is reflected by the portion 24 a and taken into the light guide 24.

  The taken light is guided to each other end side by each light guide path 24 and emitted from the emission end portion 22 b side which is the other end portion of the first light transmission member 22. That is, the light guided by each light guide path 24 is reflected by the second reflecting portion 24b provided at the other end of each light guide path 24 and is emitted substantially vertically downward with respect to one surface of the sheet member 23. The emitted light is applied to the first light receiving element 53. Thereby, since the 1st light receiving element 53 light-receives the light discharge | released from the 1st optical transmission member 22, the position of the hour hand wheel 9 can be detected and the position of the hour hand 4 can be detected.

  On the other hand, when the position of the minute hand 3 is detected by the second position detection device 51, when the second light emitting element 54 emits light as in the first position detection device 50, the light meshes with the minute hand wheel 8 and rotates. The lower surface of the intermediate wheel 10 is directly irradiated. In this state, when the intermediate wheel 10 rotates and the second light transmission hole 16 of the intermediate wheel 10 rotates and moves with the rotation of the intermediate wheel 10 to correspond to the second light emitting element 54, the second light emitting element 54. Is transmitted through the second light transmission hole 16 of the intermediate wheel 10 and applied to the incident end 32 a that is one end of the second light transmission member 32.

  Thereby, the irradiated light is taken into each light guide path 24 of the second light transmission member 32. That is, when the light from the second light emitting element 54 is applied to the incident end portion 32 a of the second light transmission member 32, the irradiated light is provided in each end portion of each light guide path 24. The light is reflected by the portion 24 a and taken into the light guide 24. The taken light is guided to each other end side by each light guide path 24 and emitted from the emission end portion 32 b side which is the other end portion of the second light transmission member 32.

  That is, the light guided by each light guide path 24 is reflected by the second reflecting portion 24b provided at the other end of each light guide path 24 and is emitted substantially vertically downward with respect to one surface of the sheet member 23. The emitted light is applied to the second light receiving element 55. Thereby, since the second light receiving element 55 receives the light emitted from the second light transmission member 32, the position of the minute hand 3 is detected by detecting the position of the intermediate wheel 10 and the position of the minute hand wheel 8. Can be detected.

  As described above, of the first and second position detection devices 50 and 51, according to the first position detection device 50, the support plate 11 is opposed to the train wheel mechanism 6, as in the first embodiment. When the first light emitting element 52 provided on the circuit board 19 is caused to emit light, the light is applied to the lower surface of the hour hand wheel 9 of the train wheel mechanism 6, and the hour hand wheel 9 rotates in this state. When the first light transmitting hole 15 corresponds to the first light emitting element 52, the light from the first light emitting element 52 passes through the first light transmitting hole 15 of the hour hand wheel 9 and is an incident end that is one end of the first light transmission member 22. The portion 22a is irradiated, and the irradiated light is taken from the incident end portion 22a which is one end portion of the first light transmission member 22 and guided to the other end portion side, and the guided light is transmitted to the first light transmission portion. A first light receiving element that is emitted from the emission end 22 b that is the other end of the member 22 and provided on the circuit board 19. It is possible to irradiate the 3, it can receive light from the first light emitting element 52 through the first optical transmission member 22 in the first light receiving element 53.

  Therefore, also in the first position detection device 50, the sheet-like first light transmission member 22 is provided on the support plate 11, and the first light emitting element is provided on the circuit board 19 facing the support plate 11 with the hour hand wheel 9 interposed therebetween. 52 and the first light receiving element 53, the structure is simple as in the first embodiment, the entire device can be made thin, and the hour hand wheel 9 rotates to rotate the hour hand wheel 9 When the first light transmission hole 15 corresponds to the first light emitting element 52, the light from the first light emitting element 52 can be received by the first light receiving element 53 via the first light transmission member 22. The position of the hour hand 4 can be accurately detected by detecting the position of the vehicle 9.

  Further, according to the second position detection device 51, as with the first position detection device 50, when the second light emitting element 54 provided on the circuit board 19 facing the support plate 11 with the train wheel mechanism 6 interposed therebetween is caused to emit light. The lower wheel of the intermediate wheel 10 that rotates while meshing with the minute hand wheel 8 of the train wheel mechanism 6 is irradiated. In this state, the intermediate wheel 10 rotates, and the second light transmission hole 16 of the intermediate wheel 10 becomes the second light emitting element. 54, the light from the second light emitting element 54 is irradiated to the incident end 32a, which is one end of the second light transmission member 32, through the second light transmission hole 16 of the intermediate wheel 10, and the irradiated light. Is taken from the incident end portion 32 a which is one end portion of the second light transmission member 32 and guided to the other end portion side, and the guided light is emitted to the other end portion of the second light transmission member 32. The second light receiving element 55 provided on the circuit board 19 is irradiated with the light emitted from 32b. Since bets can, can receive light from the second light emitting element 54 through the second optical transmission member 32 in the second light receiving element 55.

  Therefore, also in the second position detection device 51, the sheet-like second light transmission member 32 is provided on the support plate 11, and the second light emitting element is provided on the circuit board 19 facing the support plate 11 with the intermediate wheel 10 interposed therebetween. 54 and the second light receiving element 55, the structure is simple as in the first position detection device 50, the overall device can be made thin, and the intermediate wheel 10 rotates. When the second light transmission hole 16 of the intermediate wheel 10 corresponds to the second light emitting element 54, the light from the second light emitting element 54 can be received by the second light receiving element 55 via the second light transmission member 32. Thus, the position of the minute hand 3 can be accurately detected by detecting the position of the intermediate wheel 10 and detecting the position of the minute hand wheel 8 rotated by the intermediate wheel 10.

  In the second embodiment, each of the first and second light transmission members 22 and 32 has the five first reflecting portions 24a at the one end portions of the plurality of light guide paths 24, the third being the longest in the middle. It protrudes and is located on the right end side in the irradiation region 25, and the first and fifth sides on both the upper and lower sides protrude longer and are located in the middle on the left and right in the irradiation region 25, and the second and fourth between them. The second projection may be the shortest and located on the left end side in the irradiation region 25, so that the configuration may be arranged along the inner circumferential circle in the irradiation region 25. a) to each of the first reflecting portions 24a of the plurality of light guide paths 24 at different positions in the irradiation region 25 as in the first to third modifications in the first embodiment shown in FIG. The configuration may be acceptable.

  In this case, each of the other end portions of the plurality of light guide paths 24 (that is, the end portion of the light guide path 24 located on the second reflecting portion 24b side) is not shown, but as in the first to third modifications, The first and second light receiving elements 53 and 55 are provided so that the lengths in the longitudinal direction of the other end portions are different in the emission region in a state of being located in the substantially circular emission region corresponding to the light receiving region of each of the second light receiving elements 53 and 55. A configuration may be used. That is, the 2nd reflection part 24b located in each other end part of the some light guide path 24 is each 1st, 2nd light receiving element similarly to each 1st reflection part 24a in each 1st-3rd modification. What is necessary is just to make it the structure arrange | positioned in a different position in the substantially circular discharge | release area | region corresponding to each light reception area | region 53,55.

  In the second embodiment, each of the first and second light transmission members 22 and 32 may have a structure in which a plurality of light guide paths 24 are integrally formed on the sheet member 23 at a predetermined pitch P. Not only this but the structure which formed the cross-sectional shape of the some light guide path 37 small like the light transmission member 36 of the 4th modification in Embodiment 1 shown in FIG. 8, for example, and formed the pitch P1 short. But it ’s okay.

  Also in the second embodiment, each of the first and second light transmission members 22, 32, and 35 may have a configuration in which one end portions of the plurality of light guide paths 24 are linearly extended into the irradiation region 25. Not limited to this, for example, as shown in the fifth modified example in the first embodiment shown in FIG. 9, one end portion of each light guide path 24 is provided radially concentrated toward the central portion in the irradiation region 25. It may be configured. In this case, the other end portions of the plurality of light guide paths 24 (that is, the end portions of the light guide paths 24 located on the second reflecting portion 24b side) are also as shown in the fifth modification example of the first embodiment shown in FIG. Alternatively, the first and second light receiving elements 53 and 55 may be provided so as to be radially concentrated toward the central portion in the substantially circular emission region corresponding to each light receiving region.

  In the second embodiment, the first light-emitting element 52 and the first light-receiving element 53 in the first position detection device 50 may be provided on the circuit board 19 in a state of being slightly separated from each other. For example, as shown in a sixth modification of the first embodiment shown in FIG. 10, a configuration in which a light shielding wall 41 is provided between the first light emitting element 52 and the first light receiving element 53 may be adopted. Such a light shielding wall 41 is desirably provided between the second light emitting element 54 and the second light receiving element 55 in the second position detection device 51.

  Further, also in the second embodiment, when the first light transmission member 22 is provided on the lower surface of the support plate 11, one end portion of the first light transmission portion 22 is on the movement locus of the first light transmission hole 15 of the hour hand wheel 9. The first light transmission member 22 is shortened with the incident end portion 22a corresponding thereto and the emission end portion 22b being the other end portion of the first light transmission member 22 positioned outside the rotational movement region of the hour hand wheel 9. Although it may be formed and provided on the lower surface of the support plate 11, the present invention is not limited to this, and the optical transmission member 42 may be formed long as in the seventh modification example in the first embodiment shown in FIG. 11. Such a configuration can also be applied to the second optical transmission member 32.

  In addition, in the first and second embodiments and the first to seventh modifications thereof, the case where the present invention is applied to a pointer-type wristwatch has been described, but it is not necessarily a wristwatch. For example, a travel watch, an alarm clock, The present invention can be applied to various pointer-type clocks such as table clocks and wall clocks, and can be applied not only to clocks but also to instruments having hands.

It is an expanded sectional view of the principal part in Embodiment 1 which applied the position detection apparatus of this invention to the wristwatch. It is an expansion perspective view of the principal part which showed the 1st position detection part in FIG. FIG. 3 is an enlarged perspective view showing a first optical transmission member in FIG. 2. FIG. 4 is an enlarged perspective view schematically showing an optical path for guiding light from a first light emitting element to a first light receiving element by a light guide path in the first light transmission member of FIG. 3. FIG. 4 is an enlarged plan view of a main part illustrating an arrangement state of each first reflecting portion at an incident end that is one end of the first optical transmission member in FIG. 3. The 1st optical transmission member of FIG. 3 is shown, (a) is the enlarged plan view, (b) is the expanded sectional view in the AA arrow. Each modification of the arrangement state of each 1st reflection part in the incident end part which is the one end part of the 1st optical transmission member of Embodiment 1 is shown, (a) is an enlarged plane of the principal part which showed the 1st modification FIG. 4B is an enlarged plan view of the main part showing the second modification, and FIG. 5C is an enlarged plan view of the main part showing the third modification. FIG. 10 is an enlarged cross-sectional view of a main part illustrating a fourth modification of the first optical transmission member in the first embodiment. FIG. 10 is an enlarged plan view of a main part illustrating a fifth modification of the arrangement state on one end portion side in each light guide path of the first light transmission member of the first embodiment. It is an expanded sectional view of the important section showing the 6th modification of each of the 1st and 2nd position detecting devices in Embodiment 1. It is an expansion perspective view of the principal part showing the 7th modification of the 1st position detection part in Embodiment 1. It is an expanded sectional view of the principal part in Embodiment 2 which applied the position detection apparatus of this invention to the wristwatch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clock movement 2 Second hand 3 Minute hand 4 Hour hand 5 Pointer 6 Wheel train mechanism 7 Second hand wheel 8 Minute hand wheel 9 Hour hand wheel 10 Intermediate wheel 11 Support plate 13 Dial 15 First light transmitting hole 16 Second light transmitting hole 17, 50 First Position detection device 18, 51 Second position detection device 19 Circuit board 20, 52 First light emitting element 21, 53 First light receiving element 22 First light transmission member 22a, 32a Incident end 22b, 32b Emission end 23, 38 Sheet Member 24, 37 Light guide 24a 1st reflection part 24b 2nd reflection part 25 Irradiation area 30, 54 2nd light emitting element 31, 55 2nd light receiving element 32 2nd light transmission member 35, 36, 40, 42 Light transmission member

Claims (7)

A support member;
A movable member provided so as to be movable with respect to the support member and having a light transmitting portion provided at a predetermined position;
A circuit board disposed opposite to the support member across the moving member;
A light emitting element that is provided on the circuit board and emits light toward the support member;
A light receiving element that is provided on the circuit board and receives light from the support member side;
One end portion of the moving member is opposed to one of the light emitting element and the light receiving element corresponding to the movement trajectory of the light transmitting portion, and the other end portion is positioned outside the moving region of the moving member. The light receiving element is provided on the support member in a state of facing the other of the element and the light receiving element, and takes light from the light emitting element from one end and guides the light to the other end. And a sheet-like light transmission member that emits toward the light receiving element from the other end.   The light receiving element is disposed to face the one end portion of the light transmission member corresponding to a movement locus of the light transmitting portion of the moving member, and the light emitting element is located outside the moving region of the moving member. The position detection device according to claim 1, wherein the position detection device is disposed to face the other end portion of the optical transmission member positioned.   The light emitting element is disposed to face the one end portion of the light transmission member corresponding to a movement locus of the light transmitting portion of the moving member, and the light receiving element is outside a moving region of the moving member. The position detection device according to claim 1, wherein the position detection device is disposed to face the other end portion of the optical transmission member positioned.   The position detection device according to claim 1, wherein the light transmission member is formed in a sheet shape by providing a plurality of light guide paths in parallel on the sheet member.   At one end of the light guide path, there is a first reflection part that takes light irradiated on one surface of the sheet member by the light emitting element into the light guide path and reflects it toward the other end side of the light guide path. The other end portion of the light guide path is configured to reflect light reflected by the first reflection section and guided by the light guide path substantially perpendicularly to the one surface of the sheet member. The position detection device according to claim 4, further comprising a second reflection unit for irradiating the element.   Each of the one end portions of the plurality of light guide paths is positioned in an irradiation region where light from the light emitting element is irradiated onto the sheet member, and the length in the longitudinal direction of the one end portion is within the irradiation region. 6. The position detecting device according to claim 4, wherein the position detecting device is provided differently.   5. The respective one end portions of the plurality of light guide paths are provided so as to be concentrated toward a central portion in an irradiation region where light from the light emitting element is irradiated onto the sheet member. Or the position detection apparatus of 5.

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