JP2010281773A - Rotational position detection device and pointer clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational position detection device and a pointer clock capable of detecting accurately each rotational position of a plurality of rotators only by installing a set of a light emitting element and a light receiving element without receiving restriction of an installation position by the light emitting element and the light receiving element, even if the plurality of rotators are divided into a plurality of driving systems. <P>SOLUTION: This device includes: each of first and second light guide members 28, 29 for guiding light from one light emitting element 25 respectively to each upper surface side of each hand wheel 18-20, 23 in each of first and second driving system 11, 13, and emitting the guided light from an emission part of each tip toward each upper surface: and each of third and fourth light guide member 30, 31 for guiding light received by each light receiving part respectively to at least one light receiving element 26, each light receiving part being provided respectively on each under surface side of each hand wheel 18-20, 23, oppositely to each light emitting part of each of the first and second light guide members 28, 29. Consequently, each rotational position of the plurality of rotators can be detected accurately without receiving restriction of the installation position by the light emitting element and the light receiving element. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotational position detection device and a pointer timepiece that detect the rotational position of a rotating body such as a pointer wheel that moves hands such as a second hand, a minute hand, and an hour hand.

  Conventionally, a hand watch has a through-hole formed in a rotating body such as a hand wheel, and includes a rotational position detection device that detects the rotational position of the rotating body by detecting light passing through the through-hole. is there.

As this type of rotational position detection device, as described in Patent Document 1, a light emitting element disposed on one side of a rotating body and light emitted from the light emitting element are guided to the other side of the rotating body. A light guide path that emits light toward the other surface of the rotating body, and a light receiving element that is disposed on one side of the rotating body and receives light emitted from the light guide path and passing through the through hole of the rotating body Things are known.

JP 2006-46924 A

  However, in such a conventional rotational position detecting device for a pointer timepiece, a light guide path that guides the light emitted from the light emitting element disposed on one side of the rotating body to the other side of the rotating body and emits the light toward the light receiving element. Since it is formed integrally with the front case, it is necessary to install a light receiving element at a position to receive light emitted from the light guide path of the front case and passing through the through hole of the rotating body. The position is not limited, and there is a risk of interfering with mounting other components.

Further, in such a rotational position detecting device in the conventional hand clock, when the driving systems of a plurality of rotating bodies are divided into two systems and are separately driven by different driving sources, each driving system In addition, the light emitting element and the light receiving element must be provided separately, which causes a problem that the structure becomes complicated.

The problem to be solved by the present invention is that, even if a plurality of rotating bodies are divided into a plurality of drive systems, the light emitting element and the light receiving element are not restricted by the installation position, and the light emitting element and the light receiving element are combined with each other. It is an object to provide a rotational position detection device and a hand clock that can accurately detect the rotational positions of a plurality of rotating bodies for each of a plurality of drive systems simply by installing them in groups.

In order to solve the above problems, the present invention includes the following components.
According to the first aspect of the present invention, each of the first and second rotating bodies formed with through-holes penetrating in the axial direction, one light emitting element, at least one light receiving element, and the light from the light emitting element. Each of the first and second rotating bodies is guided to one side of each surface where the through holes are formed, and the guided light is directed from the light emitting portion at each end to the one side. The first and second light guide members respectively emitting light and the first and second rotating bodies and the respective through holes of the first and second rotating bodies are formed on the other surface side, and the light receiving portions are respectively provided on the first surface side. And third and fourth light guide members that are provided to face the light emitting portions of the second light guide members and guide the light received by the light receiving portions to the light receiving elements, respectively. This is a rotational position detection device.

  According to a second aspect of the present invention, each of the first and second light guide members guides light of the light emitting element to the one surface side of each of the first and second rotating bodies. Wire-shaped first and second light guide fibers and light emitted from the tips of the first and second light guide fibers are applied to the one surface of each of the first and second rotating bodies. First and second reflecting members that respectively reflect toward each other, and each of the third and fourth light guide members is on the other surface side of each of the first and second rotating bodies. Wire-like third and fourth light-guiding fibers each of which guides light received from each end face located on the side facing each of the first and second reflecting members to the light-receiving element. And facing each of the first and second reflecting members, and the first and second reflecting members, The third and fourth light beams that are reflected and reflected through the through holes of the first and second rotating bodies toward the one end surfaces of the third and fourth light guide fibers, respectively. The rotational position detecting device according to claim 1, further comprising: each reflecting member.

According to a third aspect of the present invention, the light emitting element emits light with a light emission timing shifted with respect to the first rotating body and the second rotating body, and the light receiving element is the light emitting element of the light emitting element. The rotational position detecting device according to claim 1 or 2, wherein the light receiving operation is performed in synchronization with the light emission timing.

The invention according to claim 4 is characterized in that the pointer is attached to the pointer shaft and each of the first and second pointer wheels formed with a through hole penetrating in the axial direction of the pointer shaft, one light emitting element, At least one light receiving element and light from the light emitting element are respectively guided to one surface side where each through hole of each of the first and second pointer wheels is formed, and the guided light is The other of the first and second light guide members respectively emitting from the light emitting portion at the tip toward the one surface and the through holes of the first and second pointer wheels. A light receiving portion is provided on each surface side of the first and second light guide members to face each light emitting portion, and the light received by each light receiving portion is guided to the light receiving element. 3 and 4 each light guide member.

  According to a fifth aspect of the present invention, each of the first and second light guide members guides light of the light emitting element to the one surface side of each of the first and second pointer wheels. Wire-shaped first and second light guiding fibers and light emitted from the tips of the first and second light guiding fibers are applied to the one surface of each of the first and second pointer wheels. Each of the first and second reflecting members reflecting toward each other, and each of the third and fourth light guide members is on the other surface side of each of the first and second pointer wheels. Wire-like third and fourth light-guiding fibers each of which guides light received from each end face located on the side facing each of the first and second reflecting members to the light-receiving element. And facing each of the first and second reflecting members, and the first and second reflecting members, The third and fourth light beams reflected and reflected toward the one end surfaces of the third and fourth light guide fibers are reflected by the light beams transmitted through the through holes of the first and second pointer wheels. The pointer timepiece according to claim 4, further comprising each reflecting member.

According to a sixth aspect of the present invention, the light emitting element emits light with a light emission timing shifted with respect to the first pointer wheel and the second pointer wheel, and the light receiving element is the light emitting element of the light emitting element. 6. The pointer timepiece according to claim 4, wherein the light receiving operation is performed in synchronization with the light emission timing.

  According to this invention, when detecting the rotational position of each of the first and second rotating bodies, when one light emitting element is caused to emit light, the light is transmitted by the first and second light guide members to the first and second light guiding members. Each of the second rotating bodies is guided to one side where each through hole is formed, and the guided light is emitted from the light emitting portion at each end of each of the first and second light guiding members. When the emitted light is emitted toward one surface of each of the first and second rotating bodies and the emitted light passes through each through hole of each of the first and second rotating bodies, the transmitted light is transmitted. The light received by each light receiving portion of each of the third and fourth light guide members is guided to the light receiving element, and the light guided can be received by the light receiving element. .

For this reason, even if a plurality of rotating bodies are divided into a plurality of drive systems, the light emitting element and the light receiving element are not restricted by the installation position, and the light emitting element and the light receiving element can be installed at arbitrary positions. In addition, it is possible to accurately detect the rotational positions of the plurality of rotating bodies in the plurality of driving systems only by installing one set of the light emitting element and the light receiving element.

1 is an enlarged front view showing an embodiment of a pointer-type wristwatch to which the present invention is applied. It is the expanded sectional view which showed the principal part in the AA arrow of FIG.

Hereinafter, an embodiment of a pointer-type wristwatch to which the present invention is applied will be described with reference to FIGS. 1 and 2.
This pointer-type wristwatch includes a wristwatch case 1 as shown in FIG. A watch module 2 is arranged inside the watch case 1. As shown in FIG. 2, the timepiece module 2 includes an upper housing 3 and a lower housing 4, and a timepiece movement 5 is provided between them.

In this case, as shown in FIG. 2, the dial 6 is provided on the upper surface of the upper housing 3, and the circuit board 7 is provided on the upper surface which is the inner surface of the lower housing 4. As shown in FIGS. 1 and 2, the timepiece movement 5 includes a first drive system 11 that moves the second hand 8, the minute hand 9, and the hour hand 10 located at the center of the timepiece module 2, and 3 o'clock side of the timepiece module 2. A second drive system 13 for moving the position of the secondary hand 12 and a detection unit 14 for detecting the position of the second hand 8, the minute hand 9, the hour hand 10 and the position of the secondary hand 12 are provided.

As shown in FIG. 2, each of the first and second drive systems 11, 13 is assembled between the upper housing 3 and the lower housing 4 while being assembled to the main plate 15, the train wheel bridge 16, and the middle frame 17. Has been placed. In this case, as shown in FIG. 2, the first drive system 11 includes a second hand wheel 18 that is the fourth wheel for moving the second hand 8, a minute hand wheel 19 that is the second wheel for moving the minute hand 9, and the hour hand 10. An hour wheel 20 that is an hour wheel that moves the second hand, and an intermediate wheel 21 that is a third wheel that decelerates the rotation of the second hand wheel 18 and transmits it to the minute hand wheel 19, and is driven by a first stepping motor (not shown). It is configured to be.

That is, in the first drive system 11, the second hand wheel 18 is driven to rotate by the first stepping motor, the intermediate wheel 21 is rotated by the rotation of the second hand wheel 18, and the minute hand wheel 19 is decelerated by the intermediate wheel 21. The hour hand wheel 20 is decelerated and rotated by the rotation of the minute hand wheel 19, thereby moving the second hand 8, the minute hand 9 and the hour hand 10 above the dial 6.

In this case, as shown in FIG. 2, the second hand wheel 18 has a lower part of a second hand shaft 18a which is a pointer shaft rotatably attached to the train wheel bridge 16, and an upper end portion of the second hand shaft 18a is a dial. The second hand 8 protrudes upward through the through-hole 6a, and the second hand 8 is attached to the protruding upper end portion. In this state, the second hand 8 is configured to move the dial 6 above.

The minute hand wheel 19 has a minute hand shaft 19a, which is a pointer shaft, formed in a pipe shape, and the second hand shaft 18a is inserted into the pipe-shaped minute hand shaft 19a so that the minute hand shaft 19a can rotate to the second hand shaft 18a. At the same time, the upper end portion of the minute hand shaft 19a protrudes upward through the through hole 6a of the dial 6 and the protruded upper end portion is located slightly below the upper end portion of the second hand shaft 18a. The minute hand 9 is attached to the upper end located at the position, and the minute hand 9 is configured to move the dial 6 above the dial 6 in this state.

The hour hand wheel 20 has an hour hand shaft 20a, which is a pointer shaft, formed in a cylindrical shape. By inserting the minute hand shaft 19a into the cylindrical hour hand shaft 20a, the hour hand shaft 20a is rotatable about the minute hand shaft 19a. At this time, the upper end portion of the needle shaft 20a protrudes upward through the through hole 6a of the dial plate 6, and the protruded upper end portion is located slightly below the upper end portion of the minute hand shaft 19a. The hour hand 10 is attached to the upper end located at the position, and the hour hand 10 is configured to move the dial 6 above the dial 6 in this state.

Thereby, as shown in FIG. 2, the second hand wheel 18, the minute hand wheel 19, and the hour hand wheel 20 are rotatably inserted into the hour hand shaft 20a, and the second hand shaft 18a can be rotated into the minute hand shaft 19a. It is comprised so that it may each rotate centering on the same axis | shaft. The intermediate wheel 21 has a rotating shaft 21a rotatably attached to the main plate 15 and the train wheel bridge 16, and a part thereof is disposed between the second hand wheel 18 and the minute hand wheel 19, and in this state the second hand wheel The rotation of 18 is transmitted to the minute hand wheel 19.

Further, as shown in FIG. 2, the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 are provided with through holes 18b, 19b, 20b, and 21b, respectively. That is, the through hole 18b of the second hand wheel 18 is provided through a predetermined position of the second hand wheel 18, for example, a position corresponding to the reference position where the second hand 8 is at the 12 o'clock position. The through-hole 18b of the minute hand wheel 19 is vertically moved to a predetermined position of the minute hand wheel 19 at a position corresponding to the rotation locus of the through-hole 18b of the second hand wheel 18, for example, a position corresponding to a reference position where the minute hand 9 is at the 12 o'clock position. It is provided through.

Similar to the minute hand wheel 19, the through-hole 20 b of the hour hand wheel 20 is at a predetermined position of the hour hand wheel 20 at a position corresponding to the rotation locus of the through-hole 18 b of the second hand wheel 18, for example, at a reference position where the hour hand 10 is at the 12 o'clock position. It is provided in a corresponding location penetrating up and down. The through hole 21b of the intermediate wheel 21 is provided so as to penetrate vertically at a predetermined position of the intermediate wheel 21 at a position corresponding to the rotation locus of the through hole 18b of the second hand wheel 18. As a result, each of the through holes 18b, 19b, 20b, and 21b is located at the 12 o'clock position where the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 are the reference positions, that is, at 12:00:00. , All correspondingly configured to transmit light.

On the other hand, as shown in FIG. 2, the second drive system 13 includes a sub-needle wheel 23 for moving the sub-needle 12 and a transmission wheel 24 for rotating the sub-needle wheel 23, and includes a second stepping motor. (Not shown). That is, the second drive system 13 is rotated by the transmission wheel 24 being driven by the second stepping motor, and the sub-hand wheel 23 is decelerated and rotated by the rotation of the transmission wheel 24. It is configured to move the hands.

In this case, as shown in FIG. 2, the auxiliary needle wheel 23 has an auxiliary needle shaft 23 a that is a pointer shaft rotatably attached to the train wheel bridge 16 and the main plate 15, and the auxiliary needle shaft 23 a The upper end protrudes upward through the through-hole 6b of the dial 6 and the secondary needle 12 is attached to the protruding upper end, and the secondary needle 12 is configured to move the dial 6 above in this state. The transmission wheel 24 is configured such that its rotation shaft 24 a is rotatably attached to the train wheel bridge 16 and the main plate 15, and transmits the rotation of the second stepping motor to the sub-hand wheel 23.

The auxiliary needle wheel 23 and the transmission wheel 24 are provided with through holes 23b and 24b, respectively. That is, the through-hole 23b of the sub needle wheel 23 is provided so as to penetrate vertically at a predetermined position of the sub needle wheel 23, for example, a position corresponding to the reference position where the sub needle 12 is at the 12 o'clock position. The through-hole 24b of the transmission wheel 24 is provided so as to penetrate vertically at a predetermined position of the transmission wheel 24 corresponding to the rotation locus of the through-hole 23b of the sub-hand wheel 23. Thereby, each through-hole 23b, 24b is comprised so that light may be permeate | transmitted corresponding to each other, when the sub-hand wheel 23 is a 12 o'clock position which is a reference position.

By the way, as shown in FIG. 2, the detection unit 14 includes one light emitting element 25 and one light receiving element provided on the circuit board 7 positioned below the first and second drive systems 11 and 13. 26, and the light of the light emitting element 25 is guided to the upper side of the first and second drive systems 11 and 13, respectively. The first and second light guide members 28 and 29 radiate toward the upper surfaces of the two drive systems 11 and 13, respectively, and the light receiving portions on the lower surfaces of the first and second drive systems 11 and 13, respectively. Is provided opposite to the light emitting portions of the first and second light guide members 28 and 29, and the light received by the light receiving portions is guided to one light receiving element 26, respectively. Each light guide member 30 and 31 is provided.

That is, as shown in FIG. 2, the light emitting element 25 and the light receiving element 26 are located on a circuit board 7 provided at a position that does not interfere with the first and second drive systems 11, 13, that is, on the upper surface of the lower housing 4. Is provided at a location located between the first drive system 11 and the second drive system 13.

In this case, one light emitting element 25 is controlled by a control means such as a CPU (Central Processing Unit) so that the first driving system 11 and the second driving system 13 emit light at different light emission timings. It is controlled. Further, one light receiving element 26 is controlled by a control means such as a CPU (Central Processing Unit) so as to perform a light receiving operation in synchronization with the light emission timing of the light emitting element 25.

As shown in FIG. 2, the first light guide member 28 includes a wire-shaped first light guide fiber 28a that guides light from the light emitting element 25 to the upper side of the first drive system 11, and the first light guide fiber 28a. And a first reflecting member 28 b that reflects light emitted from the tip of the first hand toward the upper surface of the hour hand wheel 20 positioned at the uppermost portion of the first drive system 11.

In this case, the first reflecting member 28b has a predetermined position on the lower surface of the dial 6, that is, when the second hand 8, the minute hand 9, and the hour hand 10 indicate the 12 o'clock position, the second hand wheel 18, the minute hand wheel 19, the hour hand It is provided at a position corresponding to each through-hole 18b, 19b, 20b of the vehicle 20. As a result, the first reflecting member 28b reflects the light emitted from the tip of the first light guide fiber 28a toward the upper surface of the hour hand wheel 20, and irradiates the spot on the rotation locus of the through hole 20b of the hour hand wheel 20. It is configured to let you.

As shown in FIG. 2, the second light guide member 29 includes a wire-shaped second light guide fiber 29a that guides light from the light emitting element 25 to the upper side of the second drive system 13, and the second light guide fiber 29a. And a second reflecting member 29b that reflects the light emitted from the tip of the head toward the upper surface of the transmission wheel 24 located at the top of the second drive system 13.

In this case, the second reflecting member 29 b is provided at a predetermined position on the lower surface of the dial 6, that is, at a position corresponding to the through hole 23 b of the sub-hand wheel 23 when the sub-hand 12 is in the state of indicating the 12 o'clock position. It has been. Thereby, the second reflecting member 29b reflects the light emitted from the tip of the second light guide fiber 29a toward the upper surface of the transmission wheel 24, and irradiates the spot on the rotation locus of the through hole 24b of the transmission wheel 24. It is configured to let you.

As shown in FIG. 2, the third light guide member 30 is disposed on the circuit board 7 positioned below the first drive system 11, and one end portion on the light receiving portion side is the first light guide member. 28 is located on the side facing the first reflecting member 28b, and the other end thereof is provided close to the light receiving element 26. A third reflecting member 30b provided to face the first reflecting member 28b in the optical member 28 is provided.

In this case, the third reflecting member 30b is provided on the circuit board 7 so as to face the first reflecting member 28b in the first light guide member 28, and the light reflected by the first reflecting member 28b is provided. When passing through the through holes 20b, 19b, 21b, and 18b of the hour hand wheel 20, the minute hand wheel 19, the intermediate wheel 21, and the second hand wheel 18, one end face of the third light guide fiber 30a on the light receiving portion side It is comprised so that it may reflect toward. The third light guide fiber 30a guides the light reflected by the third reflecting member 30b from one end surface on the light receiving unit side, and irradiates the light receiving element 26 with the guided light from the other end surface. It is configured.

As shown in FIG. 2, the fourth light guide member 31 is disposed on the circuit board 7 positioned below the second drive system 11, and one end portion on the light receiving portion side is the second light guide member. 29 is located on the side facing the second reflecting member 29 b and the other end is provided close to the light receiving element 26, and a wire-shaped fourth light guiding fiber 31 a is provided on the circuit board 7. And a fourth reflecting member 31b provided to face the second reflecting member 29b in the optical member 29.

In this case, the fourth reflecting member 31b is provided on the circuit board 7 so as to face the second reflecting member 29b in the second light guide member 29, and the light reflected by the second reflecting member 29b is provided. When passing through the through holes 24b, 23b of the transmission wheel 24 and the auxiliary needle wheel 23, the light passing therethrough is reflected toward one end surface of the fourth light guide fiber 31a on the light receiving part side. . Further, the fourth light guide fiber 31a guides the light reflected by the fourth reflecting member 31b from one end surface on the light receiving unit side, and irradiates the light receiving element 26 with the guided light from the other end surface. It is configured.

Next, in this pointer-type wristwatch, the rotational position of the second hand wheel 18, the minute hand wheel 19 and the hour hand wheel 20 in the first drive system 11 and the rotational position of the auxiliary hand wheel 23 in the second drive system 13 are detected. The case will be described.
In this case, in the first drive system 11, the second hand wheel 18 is driven and rotated by the first stepping motor, the intermediate wheel 21 is rotated by the rotation of the second hand wheel 18, and the minute hand wheel 19 is decelerated by the intermediate wheel 21. The hour hand wheel 20 is decelerated and rotated by the rotation of the minute hand wheel 19, so that the second hand 8, the minute hand 9, and the hour hand 10 respectively move the dial 6 above.

At this time, as shown in FIG. 2, in the second hand wheel 18, the minute hand wheel 19, and the hour hand wheel 20, the minute hand shaft 19a is rotatably inserted into the hour hand shaft 20a, and the second hand shaft 18a is rotatable in the minute hand shaft 19a. Are rotated around the same axis. The second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 are provided in the through holes 18 b, 19 b, 20 b, and 21 b respectively. Each rotates and corresponds to a reference position at 12 o'clock position, that is, at 12:00:00 position, so that all light can be transmitted correspondingly.

On the other hand, in the second drive system 13, the transmission wheel 24 is driven and rotated by the second stepping motor, and the rotation of the transmission wheel 24 causes the sub-hand wheel 23 to decelerate and rotate, so that the sub-needle 12 becomes the character. The needle is moved above the plate 6. At this time, the through holes 24b and 25b provided in the sub-hand wheel 24 and the transmission wheel 25 are respectively positioned at the 12:00 position when the sub-hand wheel 24 and the transmission wheel 25 rotate and the sub-hand 12 is the reference position. In this case, light can be transmitted corresponding to each other.

As described above, when the first and second drive systems 11 and 13 are operated to be at the 12 o'clock position as the reference positions, the second hand wheel 18 and the minute hand wheel 19 of the first drive system 11 are detected by the detection unit 14. The rotational position of the hour hand wheel 20 and the rotational position of the sub-hand wheel 23 in the second drive system 13 are detected at different timings. At this time, the light emitting element 25 emits light with a light emission timing shifted with respect to the first drive system 11 and the second drive system 13, and the light receiving element 26 receives light in synchronization with the light emission timing of the light emitting element 25. To do.

When the light emitting element 25 emits light, the light is guided to the upper side of the first and second drive systems 11 and 13 by the first and second light guide members 28 and 29. That is, the first light guide member 28 guides the light of the light emitting element 25 to the upper side of the first drive system 11 by the first light guide fiber 28a, and emits the guided light from the tip of the first light guide fiber 28a. Then, the emitted light is reflected by the first reflecting member 28b toward the upper surface of the hour hand wheel 20 located at the uppermost part of the first drive system 11, and on the rotation locus of the through hole 20b of the hour hand wheel 20. Spot irradiation.

At this time, if the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 are respectively rotated to be the 12 o'clock position as the reference position, that is, the position of 12:00:00, each of the through holes 18 b, 19 b, Since all of 20b and 21b are in a state where light can be transmitted correspondingly, the light reflected by the first reflecting member 28b in the first light guide member 28 is transmitted through each of the through holes 18b, 19b, 20b, The third light guide member 30 is irradiated with the third reflection member 30b through the light 21b.

Then, the light transmitted through each of the through holes 18b, 19b, 20b, and 21b is reflected by the third reflecting member 30b, and one end surface of the third light guiding member 30 on the light receiving unit side in the third light guiding fiber 30a. The received light is guided by the third light guide fiber 30a and irradiated to the light receiving element 26 from the other end surface, and the received light is received by the light receiving element 26. Thereby, it can be determined that the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 are respectively at the 12 o'clock position which is the reference position, that is, at 12:00:00.

At this time, if any of the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 is not at the 12 o'clock position which is the reference position, that is, the position at 12:00:00, the first light guide The light reflected by the first reflecting member 28b in the member 28 does not pass through all the through holes 18b, 19b, 20b, 21b, and any of the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20, and the intermediate wheel 21 It is shaded by.

For this reason, since the light reflected by the first reflecting member 28b in the first light guide member 28 does not reach the third light guide member 30, the light receiving element 26 does not receive the light. . Thereby, it can be determined that the rotational position of any of the second hand wheel 18, the minute hand wheel 19, the hour hand wheel 20 and the intermediate wheel 21 is shifted.

On the other hand, the second light guide member 29 guides the light emitted from the light emitting element 25 to the upper side of the third drive system 13 by the second light guide fiber 29a, and guides the guided light from the tip of the second light guide fiber 29a. The emitted light is reflected by the second reflecting member 29b toward the upper surface of the transmission wheel 24 located at the uppermost part of the second drive system 13, and on the rotation locus of the through hole 24b of the transmission wheel 24. Let spot irradiation.

At this time, if the sub-hand wheel 23 and the transmission wheel 24 are respectively rotated and are at the 12 o'clock position, which is the reference position, the second through holes 23b and 24 are in a state in which light can be transmitted correspondingly. The light reflected by the second reflecting member 29 b in the light guiding member 29 passes through the through holes 23 b and 24 b and is irradiated to the fourth reflecting member 31 b in the fourth light guiding member 31.

Then, the light transmitted through the through holes 23b and 24b is reflected by the fourth reflecting member 31b and taken in from the one end surface of the fourth light guide member 31 on the light receiving unit side of the fourth light guide fiber 31a. The introduced light is guided by the fourth light guide fiber 31a and applied to the light receiving element 26, and the light receiving element 26 receives the irradiated light. At this time, when the light receiving element 26 receives light with a timing shift with respect to the first drive system 11, it can be determined that the auxiliary hand wheel 23 and the transmission wheel 24 are at the 12 o'clock position, which is the reference position. .

At this time, when either the auxiliary hand wheel 23 or the transmission wheel 24 is not at the 12 o'clock position which is the reference position, the light reflected by the second reflecting member 29b in the second light guide member 29 is All of the through holes 23b and 24b do not pass through and are shielded from light by either the auxiliary needle wheel 23 or the transmission wheel 24. For this reason, the light reflected by the second reflecting member 29b in the second light guide member 29 does not reach the fourth light guide member 31, and the light receiving element 26 does not receive the light. It can be determined that one of the rotational positions of the transmission wheel 24 is shifted.

Thus, according to this pointer-type wristwatch, the light of one light emitting element 25 is guided to the upper surface side of each of the indicator wheels 18 to 20 and 23 in the first and second drive systems 11 and 13, respectively. Each of the first and second light guide members 28 and 29 for emitting the guided light from the light emitting portion at each end toward the top surface, and the first and second drive systems 11 and 13, respectively. A light receiving portion is provided on each lower surface side of the indicator wheels 18 to 20 and 23 to face the light emitting portions of the first and second light guide members 28 and 29, and the light received by the light receiving portions is received. Since the third and fourth light guide members 30 and 31 respectively guide the light to one light receiving element 26, the light emitting element 25 and the light receiving element 26 are not limited by the installation position. The rotational positions of the pointer wheels 18 to 20 and 23 in the first and second drive systems 11 and 13 are detected. Can.

That is, according to this pointer-type wristwatch, when detecting the rotational position of the pointer wheels 18 to 20 and 23 in the first and second drive systems 11 and 13, when one light emitting element 25 is caused to emit light. The light is guided to the top surfaces of the first and second drive systems 11 and 13 by the first and second light guide members 28 and 29, respectively, and the guided light is the first and second light. The respective light guide members 28 and 29 are emitted from the light emitting portions at the tips thereof toward the upper surfaces thereof, and the emitted light is respectively indicated by the indicator wheels 18 to 20 in the first and second drive systems 11 and 13. , 23 are transmitted through the respective through holes 18b to 20b, 23b, and the transmitted light is taken in by the light receiving portions of the third and fourth light guide members 30, 31, respectively. Since the light is guided to one light receiving element 26, the light receiving element 26 It can be received.

Therefore, even if the pointer wheels 18 to 20 and 23 are divided into the first and second drive systems 11 and 13, the light emitting element 25 and the light receiving element 26 are not restricted by the installation position, and the light emission. The element 25 and the light receiving element 26 can be installed at arbitrary positions on the circuit board 7, so that the light emitting element 25 and the light receiving element 26 do not interfere with the first and second drive systems 11 and 13. Can be installed. Further, even if each of the indicator wheels 18 to 20 and 23 is divided into the first and second drive systems 11 and 13, it is only necessary to install one light emitting element 25 and one light receiving element 26. The rotational positions of the pointer wheels 18 to 20 and 23 of the second drive systems 11 and 13 can be accurately detected.

In this case, each of the first and second light guide members 28 and 29 guides the light from the light emitting element 25 to the upper surfaces of the first and second drive systems 11 and 13, respectively. The second light guide fibers 28a and 29a and the light emitted from the tips of the first and second light guide fibers 28a and 29a on the upper surfaces of the first and second drive systems 11 and 13, respectively. Since each of the first and second reflecting members 28b and 29b that reflect toward each other is provided, the first and second light guiding fibers 28a and 29a allow the light from the light emitting element 25 to be reflected in the first and second light beams, respectively. The light can be easily and surely guided to the upper surface sides of the drive systems 11 and 13, and the light guided by the first and second light guiding fibers 28a and 29a can be guided to the first and second reflecting members 28b, 29b toward the upper surfaces of the first and second drive systems 11 and 13. It can be excellently illuminated Te.

The third and fourth light guide members 30 and 31 are provided on the lower surfaces of the first and second drive systems 11 and 13, respectively, and are connected to the first and second reflection members 28b and 29b. The wire-like third and fourth light guiding fibers 30a and 31a for guiding the light received from the respective one end faces located on the opposite sides to the light receiving element 26, respectively, and the first and second reflecting members 28b. , 29b, respectively, and the light transmitted through the through holes 18b to 20b, 23b of the first and second drive systems 11, 13 is respectively transmitted to the third and fourth light guide fibers 30a, 31a. Since each of the third and fourth reflecting members 30b and 31b that reflect toward one end surface is provided, the light passes through the through holes 18b to 20b and 23b of the first and second drive systems 11 and 13, respectively. The third and fourth reflecting members 30b and 31b The four light guide fibers 30a and 31a can be reflected toward one end face, and the reflected light is reliably guided to the light receiving element 26 by the third and fourth light guide fibers 30a and 31a to be received. be able to.

Furthermore, in this pointer-type wristwatch, the light emitting element 25 emits light with the light emission timing shifted with respect to the first drive system 11 and the second drive system 13, and the light is received in synchronization with the light emission timing of the light emitting element 25. With the light receiving operation of the element 26, the rotational positions of the second hand wheel 18, the minute hand wheel 19, and the hour hand wheel 20, which are the first drive system 11, can be obtained only by providing one light emitting element 25 and one light receiving element 26. The rotational position of the sub-hand wheel 23 that is the second drive system 13 can be accurately and reliably detected by the single light receiving element 26.

In the above-described embodiment, the light emission timing of the light emitting element 25 is shifted with respect to the first drive system 11 and the second drive system 13, and the light receiving element 26 performs a light receiving operation in synchronization with this. Although the case where each light receiving element 26 is configured to detect each rotational position of the first drive system 11 and the second drive system 13 has been described, the present invention is not limited to this, and two light receiving elements are arranged, One light receiving element may detect the rotational position of the first drive system 11 and the other light receiving element may detect the rotational position of the second drive system 13.

In the above-described embodiment, the first and second light guide members 28 and 29 include the first and second light guide fibers 28a and 29a and the first and second reflection members 28b and 29b. The case where the third and fourth light guide members 30 and 31 include the third and fourth light guide fibers 30a and 31a and the third and fourth reflection members 30b and 31b will be described. However, the present invention is not limited to this. For example, each of the first and second light guide members 28 and 29 includes only the first and second light guide fibers 28a and 29a, and the third and fourth light guide members. 30 and 31 may be composed of only the third and fourth light guide fibers 30a and 31a.

In this case, the tips of the first and second light guide fibers 28a and 29a in the first and second light guide members 28 and 29 are respectively connected to the upper surfaces of the first and second drive systems 11 and 13. And directing the light from the light emitting element 25 directly onto the top surfaces of the first and second drive systems 11 and 13, and the third and fourth surfaces. The first and second light guide fibers 28a with the tips of the third and fourth light guide fibers 30a and 31a in the light guide members 30 and 31 facing the lower surfaces of the first and second drive systems 11 and 13, respectively. The light transmitted through the through holes 18b to 21b, 23b, and 24b may be directly taken from the tips of the third and fourth light guide fibers 30a and 31a. If comprised in this way, since each 1st-4th reflection member 28b-31b becomes unnecessary, a number of parts can be reduced.

In the above-described embodiment and its modification, the first drive system 11 has a second hand wheel 18, a minute hand wheel 19, and an hour hand wheel 20, and the second drive system 13 has a sub-hand wheel 23. Although a certain case has been described, the present invention is not limited to this, and the first drive system 11 is composed of a minute hand wheel 19 and an hour hand wheel 20, and the second drive system 13 is composed of a second hand wheel 18 instead of the sub-hand wheel 23. You may do it.

Furthermore, in the above-described embodiment, the first drive system 11 has the second hand wheel 18, the minute hand wheel 19, and the hour hand wheel 20, and the case where these are driven by one stepping motor has been described. Not limited to this, the first drive system 11 may be divided into a drive system of only the second hand wheel 18 and a drive system of the minute hand wheel 19 and the hour hand wheel 20.

In this case, a stepping motor for driving only the second hand wheel 18 and a stepping motor for driving the minute hand wheel 19 and the hour hand wheel 20 are provided, and the first hand corresponding to the drive system of the minute hand wheel 19 and the hour hand wheel 20 is provided. The third light guide members 28 and 30 may be arranged, and the second and fourth light guide members 29 and 31 may be arranged corresponding to the drive system of the second hand wheel 18.

In addition, in the above-described embodiment and each modification thereof, the case where it is applied to a pointer type wristwatch has been described, but it is not necessarily a wristwatch. It can be applied to the watch of the formula.

DESCRIPTION OF SYMBOLS 1 Watch case 2 Watch module 5 Watch movement 6 Dial 7 Circuit board 8 Second hand 9 Minute hand 10 Hour hand 11 First drive system 12 Sub needle 13 Second drive system 14 Detection part 18 Second hand wheel 18b Second hand wheel 19th hand Wheel 19b Minute hand wheel through hole 20 Hour hand wheel 20b Hour hand wheel through hole 23 Sub needle wheel 23b Sub needle wheel through hole 25 Light emitting element 26 Light receiving element 28-31 First to fourth light guide members 28a-31a 1st-4th each light guide fiber 28b-31b 1st-4th each reflection member

Claims (6)

First and second rotating bodies each having a through-hole penetrating in the axial direction;
One light emitting element;
At least one light receiving element;
The light from the light emitting element is guided to each side of each of the first and second rotating bodies where the respective through holes are formed, and the guided light is transmitted from the light emitting portion at each tip. First and second light guide members respectively emitting toward one of the surfaces;
On the other side of each of the first and second rotating bodies where the through holes are formed, a light receiving portion faces the light emitting portions of the first and second light guide members, respectively. A third light guide member and a fourth light guide member, each of which guides light received by each light receiving portion to the light receiving element;
A rotational position detecting device comprising: Each of the first and second light guide members is a wire-like first and second light guide for guiding the light of the light emitting element to the one surface side of each of the first and second rotating bodies. The first and second light reflecting each light guide fiber and the light emitted from each tip of the first and second light guide fibers toward the one surface of each of the first and second rotating bodies. 2 reflective members,
The third and fourth light guide members are provided on the other surfaces of the first and second rotating bodies, respectively, on the sides facing the first and second reflecting members, respectively. Each of the third and fourth light guide fibers that guide light received from the respective one end faces to the light receiving element, and the first and second reflecting members, respectively. The light reflected by the first and second reflecting members and transmitted through the through holes of the first and second rotating bodies is applied to the one end surfaces of the third and fourth light guiding fibers. The rotational position detection device according to claim 1, further comprising third and fourth reflecting members that respectively reflect toward the surface. The light emitting element emits light with a light emission timing shifted with respect to the first rotating body and the second rotating body, and the light receiving element performs a light receiving operation in synchronization with the light emitting timing of the light emitting element. The rotational position detection device according to claim 1 or 2, wherein First and second pointer wheels each having a pointer attached to the pointer shaft and formed with a through-hole penetrating in the axial direction of the pointer shaft;
One light emitting element;
At least one light receiving element;
The light from the light-emitting element is guided to one side of each of the first and second pointer wheels where the through holes are formed, and the guided light is transmitted from the light-emitting portion at each tip. First and second light guide members respectively emitting toward one of the surfaces;
On the other side of each of the first and second pointer wheels where the through holes are formed, a light receiving portion faces the light emitting portions of the first and second light guide members, respectively. A third light guide member and a fourth light guide member, each of which guides light received by each light receiving portion to the light receiving element;
A pointer clock characterized by comprising: Each of the first and second light guide members guides the light of the light emitting element to the one surface side of each of the first and second pointer wheels. Each of the light guide fibers and the first and second light beams that reflect the light emitted from the tips of the first and second light guide fibers toward the one surface of the first and second pointer wheels, respectively. 2 reflective members,
The third and fourth light guide members are provided on the other surface sides of the first and second pointer wheels, respectively, on the sides facing the first and second reflecting members, respectively. Each of the third and fourth light guide fibers that guide light received from the respective one end faces to the light receiving element, and the first and second reflecting members, respectively. The light reflected by the first and second reflecting members and transmitted through the through holes of the first and second pointer wheels is applied to the end surfaces of the third and fourth light guide fibers. 5. The pointer timepiece according to claim 4, further comprising third and fourth reflecting members that respectively reflect toward each other. The light emitting element emits light with a light emission timing shifted with respect to the first pointer wheel and the second pointer wheel, and the light receiving element performs a light receiving operation in synchronization with the light emission timing of the light emitting element. The pointer timepiece according to claim 4 or 5, characterized in that.

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