JP2016114390A - Gear mechanism, gear mechanism control method, movement and analogue quartz watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear mechanism, a gear mechanism control method, a movement, and an analogue quartz watch capable of accurately and quickly detecting the reference position of a position detection gear.SOLUTION: A gear mechanism includes: a position detection gear 71; a light emission element 81 provided on one side in the axial direction of the position detection gear 71; and a light emission element 83 provided in the position corresponding to the light emission element 81. The position detection gear 71 includes: a light-blocking part 72 incapable of transmitting light; a first transmission part 73 capable of transmitting light and extending in a peripheral direction of the position detection gear 71; and a second transmission part 76 capable of transmitting light and provided in accordance with a reference position of the position detection gear 71. The first transmission part 73 includes: a width expanded part 74; a width narrowed part 75 provided on the upstream side in the rotation direction of the position detection gear 71 in a peripheral direction of the width expanded part 74. The second transmission part 76 is provided on the upstream side U of the first transmission part 73.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a gear mechanism, a gear mechanism control method, a movement, and an analog quartz type timepiece.

Conventionally, an analog quartz timepiece such as a radio timepiece equipped with an automatic hand position correction function is known.
Non-Patent Document 1 discloses a position detection gear to which a watch hand is attached, a light emitting element provided on one side in the axial direction of the position detection gear, and light emission on the other side in the axial direction of the position detection gear. Automatic correction of the needle position using a light receiving element provided at a position corresponding to the element is described. The position detection gear includes a detection hole formed at a position corresponding to the reference position and capable of transmitting light, and undetected areas where light of different widths cannot be transmitted on both sides of the detection hole.

  In the technique described in Non-Patent Document 1, in order to automatically correct the hand position, the reference position of the position detecting gear to which the hand is attached (for example, the position of 0 second in the case of the second hand) is detected. . Specifically, the position detection gear is rotated at a predetermined speed, and the reference position of the position detection gear is detected when the light receiving element receives light emitted from the light emitting element through the detection hole.

  By the way, while detecting the reference position of the position detecting gear, it is necessary to always emit light from the light emitting element. Therefore, in order to reduce the power consumed by the light emitting element, it is required to shorten the detection time of the reference position of the gear.

Nobuhiro Aoki, “Development of Analog Timepiece with Automatic Hand Position Correction Function”, 2010, Micromechatronics (Journal of the Timepiece Society of Japan) Vol 54, No 202, p. 11-p. 16

  However, in the prior art, it is necessary to detect the detection hole and stop the rotating position detection gear at the reference position. For this reason, considering the phase shift and the step-out of the stepping motor that is the driving source, there is a limit to the speed at which the position detecting gear is rotated. Therefore, in the prior art, there is room for improvement in that the reference position is accurately and quickly detected by rotating the position detection gear at high speed.

  The present invention has been made in view of the above circumstances, and provides a gear mechanism, a gear mechanism control method, a movement, and an analog quartz timepiece that can accurately and quickly detect a reference position of a position detection gear. There is.

  In order to solve the above problems, a gear mechanism of the present invention includes a position detection gear that is rotated by the power of a drive source, a light emitting element provided on one side in the axial direction of the position detection gear, and the position detection. A light receiving element provided at a position corresponding to the light emitting element on the other side in the axial direction across the gear for gears, and the position detecting gear is configured to be unable to transmit light from the light emitting element. A light-shielding portion, a first transmission portion that extends along a circumferential direction of the position detection gear, and a light transmission from the light-emitting device that can transmit light from the light-emitting device. A second transmission part provided corresponding to a reference position of the gear for use, wherein the first transmission part is a wide part and the rotational direction of the position detection gear in the circumferential direction than the wide part. A narrow portion provided on the upstream side of It said second transmission section is characterized in that is provided on the upstream side of the first transmission part.

  According to the present invention, the position detection gear includes the first transmission portion having a wide portion, and a narrow portion provided on the upstream side of the rotation direction of the position detection gear in the circumferential direction from the wide portion. Therefore, when the position detection gear is rotating, the light receiving element can obtain different light detection levels in the wide portion and the narrow portion. Thereby, when the position detection gear rotates and the first transmission part passes between the light emitting element and the light receiving element, the rotation part of the position detection gear is obtained by detecting the wide part and the narrow part. be able to. Furthermore, since the second transmission part is provided on the upstream side of the first transmission part, the second transmission part corresponding to the reference position is detected by rotating the position detection gear by a predetermined angle after detecting the narrow part. Can be foreseen. Accordingly, the gear mechanism rotates the position detection gear at a high speed when the wide portion of the first transmission portion is detected, and the position of the position detection gear when the narrow portion of the first transmission portion is detected. The rotational speed can be reduced, and the position detecting gear can be reliably stopped when the second transmission portion is detected. Therefore, it is possible to provide a gear mechanism that can accurately and quickly detect the reference position of the position detecting gear.

  Further, the drive source is a step motor.

  According to the present invention, the rotation angle of the position detection gear can be easily controlled by the number of drive pulses of the step motor. Therefore, the reference position of the position detection gear can be detected accurately and quickly.

  Further, the central angle from the downstream end of the narrow portion in the rotation direction to the upstream end of the narrow portion is obtained when the step motor is rotated by a first predetermined number of steps. The rotation angle of the position detection gear is set according to the rotation angle.

  According to the present invention, the central angle from the downstream end to the upstream end of the narrow portion corresponds to the rotation angle of the position detecting gear when the step motor is rotated by the first predetermined number of steps. Therefore, when the narrow portion passes between the light emitting element and the light receiving element, the rotation angle of the position detecting gear can be controlled by the number of drive pulses. Thus, the narrow portion can pass between the light emitting element and the light receiving element reliably and quickly. Therefore, it is possible to provide a gear mechanism that can accurately and quickly detect the reference position of the position detecting gear.

  The center angle from the upstream end of the narrow portion to the center of the second transmission portion is the rotation angle of the position detecting gear when the step motor is rotated by a second predetermined number of steps. It is characterized by being set corresponding to

  According to the present invention, the center angle from the upstream end of the narrow portion to the center of the second transmission portion is the rotation angle of the position detection gear when the step motor is rotated by the second predetermined number of steps. Since it is set correspondingly, the rotation from the narrow part to the second transmission part can be controlled by the number of drive pulses. Thereby, the light-shielding part between the narrow part and the second transmission part can reliably and quickly pass between the light-emitting element and the light-receiving element. Therefore, it is possible to provide a gear mechanism that can accurately and quickly detect the reference position of the position detecting gear.

  Further, the outer shape of the light emitting element is formed to be larger than the width of the narrow portion.

  According to the present invention, a sufficient amount of light can be obtained, and the difference between the amount of light passing through the wide portion and the amount of light passing through the narrow portion can be increased. Therefore, the light receiving element can reliably detect the wide portion and the narrow portion.

In the gear mechanism control method of the present invention, when the light emitting element is at a position corresponding to the narrow portion, an output obtained from the light receiving element is set as a first predetermined output value, and the upstream of the narrow portion When the light emitting element is at a position straddling the narrow part and the light shielding part at the end on the side, an output obtained from the light receiving element is set as a second predetermined output value, and the light emitting element is When the output obtained from the light receiving element is a third predetermined output value in the position corresponding to the part,
A first driving step of driving the step motor at a first predetermined rotational speed; a first output determining step of determining whether an output obtained from the light receiving element is the first predetermined output value; and the light receiving element A second driving step of driving the step motor at a second predetermined rotational speed lower than the first predetermined rotational speed when the output obtained from the first predetermined output value is obtained, and an output obtained from the light receiving element A second output determination step for determining whether the output is the second predetermined output value; a third output determination step for determining whether the output obtained from the light receiving element is the third predetermined output value; , And a step driving step of rotating the step motor by the second predetermined number of steps is provided between the second output determination step and the third output determination step.

  According to the present invention, since the step drive process for rotating the step motor by the second predetermined number of steps is provided between the second output determination process and the third output determination process, the position detection is performed based on the number of drive pulses. The rotation angle of the gear can be easily controlled, and the reference position of the position detection gear can be detected accurately and quickly.

The movement of the present invention is characterized by including the above-described gear mechanism.
Further, the position detecting gear is characterized by interlocking with at least one of a second hand, a minute hand and an hour hand.
In addition, an analog quartz timepiece of the present invention is characterized by including the above-described movement.

  ADVANTAGE OF THE INVENTION According to this invention, the movement and analog quartz type | mold timepiece which can detect the reference position of the position detection gear correctly and rapidly can be provided. In addition, it is possible to provide a movement and an analog quartz watch that can detect and automatically correct the position of at least one of the second hand, the minute hand, and the hour hand.

  According to the present invention, the position detection gear includes the first transmission portion having a wide portion, and a narrow portion provided on the upstream side of the rotation direction of the position detection gear in the circumferential direction from the wide portion. Therefore, when the position detection gear is rotating, the light receiving element can obtain different light detection levels in the wide portion and the narrow portion. Thereby, when the position detection gear rotates and the first transmission part passes between the light emitting element and the light receiving element, the rotation part of the position detection gear is obtained by detecting the wide part and the narrow part. be able to. Furthermore, since the second transmission part is provided on the upstream side of the first transmission part, the second transmission part corresponding to the reference position is detected by rotating the position detection gear by a predetermined angle after detecting the narrow part. Can be foreseen. Accordingly, the gear mechanism rotates the position detection gear at a high speed when the wide portion of the first transmission portion is detected, and the position of the position detection gear when the narrow portion of the first transmission portion is detected. The rotational speed can be reduced, and the position detecting gear can be reliably stopped when the second transmission portion is detected. Therefore, it is possible to provide a gear mechanism that can accurately and quickly detect the reference position of the position detecting gear.

It is an external view which shows the timepiece which concerns on embodiment. It is the top view which looked at the movement from the front side. It is a fragmentary sectional view of the movement concerning an embodiment. It is a top view of the gear mechanism when seen from the front side of the movement. It is a flowchart of a gear mechanism control method. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is explanatory drawing of the positional relationship of a 1st permeation | transmission part, a 2nd permeation | transmission part, and a position detection sensor. It is a time chart of a gear mechanism control method.

Embodiments of the present invention will be described with reference to the drawings.
In general, a machine body including a driving part of a timepiece is referred to as a “movement”. A state in which a dial and a pointer are attached to the movement, and the dial is put into a watch case to form a finished product is referred to as “complete” of the watch.
Of the both sides of the base plate constituting the base of the watch, the side of the watch case with the glass, that is, the side with the dial is referred to as the “back side” of the movement. Of the two sides of the main plate, the side of the watch case with the case back, that is, the side opposite to the dial is referred to as the “front side” of the movement.

FIG. 1 is an external view showing a timepiece 1 according to an embodiment of the present invention.
As shown in FIG. 1, the timepiece 1 is an analog quartz type timepiece. The complete of the timepiece 1 includes a movement 10, a dial 11, and hands 12, 13, and 14 inside a timepiece case 3 including a case back cover (not shown) and glass 2.
The dial plate 11 has at least a scale indicating information about time. The hands 12, 13, and 14 include an hour hand 12 that indicates the hour, a minute hand 13 that indicates the minute, and a second hand 14 that indicates the second.

FIG. 2 is a plan view of the movement viewed from the front side, and FIG. 3 is a partial sectional view of the movement.
As shown in FIGS. 2 and 3, the movement 10 includes a main plate 20 and a train wheel bridge 29 (see FIG. 3). The main plate 20 constitutes the base of the movement 10.
On the back side of the main plate 20, the above-described dial 11 is disposed so as to be visible through the glass 2.
On the front side of the main plate 20, a battery 21, a crystal unit 22, a circuit board 25, a step motor 35 as a power source, a gear train mechanism 23, a gear mechanism 70, and the like are disposed.

The crystal unit 22 has a crystal resonator (not shown) that oscillates at a predetermined frequency. The crystal unit is connected to a circuit board 25 in which a lead portion 22 a is formed on the front side of the ground plane 20.
The circuit board 25 is electrically connected to the positive electrode of the battery 21 through a battery positive terminal (not shown) and the negative pattern is electrically connected to the negative electrode of the battery 21 through a battery negative terminal (not shown).
An integrated circuit 26 is mounted on the circuit board 25. The integrated circuit 26 is composed of, for example, a C-MOS or PLA, and an oscillation unit (oscillator) that outputs a reference signal based on vibration of a crystal resonator, and a frequency dividing unit that divides the output signal of the oscillation unit. (Divider), a drive unit (driver) for outputting a motor drive signal for driving the step motor 35 based on the output signal of the frequency dividing unit, a signal from a position detection sensor 80 (see FIG. 3) described later, and a second hand A signal processing unit for detecting the position of 14 is provided inside.

The step motor 35 includes a coil block 30 including a coil wire wound around a magnetic core, a stator 31 disposed so as to contact both end portions of the magnetic core of the coil block 30, and a rotor 32 disposed in a rotor hole 31a of the stator 31. And having.
The rotor 32 is rotatably supported with respect to the main plate 20 and the train wheel bridge 29. That is, the upper shaft portion of the rotor 32 is pivotally supported by the bearing portion of the train wheel bridge 29, and the lower shaft portion of the rotor 32 is pivotally supported by the bearing portion of the main plate 20.

  The train wheel mechanism 23 includes a plurality of gear bodies such as a fifth wheel 40, a gear mechanism 70 including a fourth wheel 41, a third wheel 42, a second wheel 43, a minute wheel 55, and an hour wheel 44. In the following description, the extending direction of the central axes O1 and O2 of the axle 60 of the fourth wheel 41 and the axle 65 of the third wheel 42 is defined as the axial direction, and the train wheel bridge 29 side (that is, the movement 10) along the axial direction. May be referred to as the upper side, and the base plate 20 side (ie, the back side of the movement 10) may be referred to as the lower side. Moreover, in this embodiment, each gear body mentioned above comprises a reduction gear train (wheel train).

The fifth wheel & pinion 40 has a fifth gear 40a and a fifth upper pinion 40b, and is supported rotatably with respect to the main plate 20 and the train wheel bridge 29. The fifth gear 40 a meshes with the rotor pinion 32 d of the rotor 32 provided in the step motor 35. As a result, the fifth wheel & pinion 40 rotates as the rotor 32 rotates.
The fourth wheel 41 is disposed between the fifth wheel 40 and the third wheel 42, and includes an axle 60, a fourth lower pinion 61 formed on the axle 60, and a fourth gear 62 fixed to the axle 60. Have. The fourth gear 62 functions as a position detection gear 71 described later.
The axle 60 is supported by the main plate 20 and the train wheel bridge 29 so as to be rotatable around the central axis O1.

The axle 60 is rotatably inserted into the center pipe 51. The center pipe 51 extends so as to be coaxial with the center axis O <b> 1 and is held by a second receiver 50 fixed to the upper surface of the main plate 20. The second receiver 50 has a flat plate shape extending in the in-plane direction orthogonal to the axial direction between the main plate 20 and the train wheel bridge 29, and the upper end of the center pipe 51 is press-fitted into a portion overlapping the central axis O1. A hole 50a is formed.
A lower end portion 60 b of the axle 60 projects downward from the center pipe 51. A second hand 14 is attached to the lower end 60 b of the axle 60. An upper end portion 60 a of the axle 60 is pivotally supported by a tenon frame 63 disposed in the train wheel bridge 29.

The fourth lower pinion 61 is disposed above the center pipe 51 in the axle 60 and meshes with the third gear 66 of the third wheel 42.
The third wheel 42 includes an axle 65 rotatably supported by the main plate 20 and the train wheel bridge 29, a third lower pinion 67 formed on the axle 65, and the third gear 66 described above fixed to the axle 65. Have.
The axle 65 is held by the bearing portion of the main plate 20 while the lower end portion penetrates the accommodation hole 50b formed in the second receiver 50 described above.
The third gear 66 meshes with the fourth lower pinion 61 of the fourth wheel 41. As a result, the third wheel & pinion 42 rotates as the fourth wheel & pinion 41 rotates.

The second wheel & pinion 43 is arranged coaxially with the central axis O <b> 1 of the fourth wheel & pinion 41, and is rotatably inserted into the center pipe 51.
The second wheel 43 has a second gear 43 a that meshes with the third lower pinion 67 of the third wheel 42. As a result, the second wheel & pinion 43 rotates as the third wheel & pinion 42 rotates.
The second wheel & pinion 43 is configured to be rotated once per hour while the minute hand 13 is attached to the lower end portion. The minute hand 13 is located closer to the dial 11 than the second hand 14 attached to the fourth wheel & pinion 41.

The hour wheel 44 is disposed so as to be coaxial with the central axis O <b> 1 of the fourth wheel 41, and is rotatably inserted into the second wheel 43. The hour wheel 44 has a cylindrical gear 44 a that meshes with the center wheel & pinion 43 via a minute wheel 55 (see FIG. 2) and the like. Thereby, the hour wheel 44 rotates based on the minute wheel 55.
The hour wheel 44 is configured so that the hour hand 12 is attached to the lower end portion and rotates once every 12 hours. The hour hand 12 is located closer to the dial 11 than the minute hand 13.

A winding stem 24 is rotatably supported in a winding stem guide hole (not shown) formed in the main plate 20. The winding stem 24 is used for time adjustment for rotating the minute hand 13 and the hour hand 12 to correct the time display (hour and minute display). A crown 53 located on the side of the watch case 3 is attached to the tip of the winding stem 24. The winding stem 24 can be pulled out in the extending direction stepwise, and the position in the extending direction is determined by a switching device such as a setting lever, a yoke, a spring, etc. (not shown).
When the minute wheel 55 is rotated with the winding stem 24 pulled out, it rotates via a pinion wheel or the like (not shown). The second wheel 43 and the hour wheel 44 are configured to rotate when the minute wheel 55 rotates. Thereby, time adjustment is possible.

(Gear mechanism)
Next, the gear mechanism 70 according to the present embodiment will be described.
In the gear mechanism 70 of this embodiment, the fourth gear 62 of the fourth wheel & pinion 41 interlocked with the second hand 14 is used as a position detection gear 71, and the position of the position detection gear 71 and the second hand 14 interlocked therewith is set as a reference position ( In this embodiment, this is a mechanism for adjusting the second hand 14 to a position indicating 0 second).
As shown in FIG. 3, the gear mechanism 70 includes a position detection gear 71 and a position detection sensor 80 including a light emitting element 81 and a light receiving element 83. In FIG. 3, the light emitting element 81 and the light receiving element 83 are illustrated by a two-dot chain line.

  The position detection gear 71 is rotated by the power of the step motor 35 as a drive source being transmitted via the fifth wheel & pinion 40. The position detection gear 71 is configured to rotate once in the CCW direction when the step motor 35 is driven by a drive pulse and rotates 60 steps. In other words, the rotation angle of the position detection gear 71 corresponding to one step of the step motor 35 is set to 6 °.

  FIG. 4 is a plan view of the gear mechanism as viewed from the front side of the movement. FIG. 4 illustrates a state in which the position detection gear 71 of the gear mechanism 70 is at the reference position. In the following description, in the plan view of the gear mechanism 70 from FIG. 4 onward, the direction along the central axis O1 is referred to as the axial direction, the direction orthogonal to the central axis O1 is referred to as the radial direction, and the circuit travels around the central axis O1. The direction of turning is called the circumferential direction, the direction of turning clockwise around the central axis O1 is called the CW direction, and the direction of turning counterclockwise around the central axis O1 is called the CCW direction. In addition, the light emitting element 81 and the light receiving element 83 are illustrated by a two-dot chain line. Further, the rotation direction of the position detecting gear 71 is indicated by an arrow, the reference symbol U is attached to the upstream side in the rotational direction, and the reference symbol D is attached to the downstream side in the rotational direction.

As shown in FIG. 4, the position detection gear 71 is entirely formed of a resin material, for example, and includes a first transmission part 73, a second transmission part 76, and a light shielding part 72. .
The first transmission part 73 extends in an arc shape along the circumferential direction at the peripheral part of the position detecting gear 71. The first transmission part 73 is formed so that the width direction coincides with the radial direction of the position detection gear 71. The first transmission portion 73 is formed such that an intermediate position in the width direction is separated from the central axis O1 of the position detection gear 71 by a distance r. The first transmission part 73 penetrates the front and back of the position detection gear 71 and allows light to pass therethrough.

The first transmission part 73 has a wide part 74 and a narrow part 75.
The wide portion 74 is formed in an arc shape having a predetermined width in the radial direction of the position detection gear 71. The upstream end portion 74 a and the downstream end portion 74 b of the wide portion 74 are each formed in an arc shape that bulges outward in the circumferential direction of the position detection gear 71 in plan view. The sector central angle formed by the upstream end 74a, the downstream end 74b, and the central axis O1 of the wide portion 74 is set to about 70 °, for example.

  The narrow portion 75 is provided upstream of the wide portion 74 in the rotation direction of the position detecting gear 71 in the circumferential direction, and is formed in an arc shape having a predetermined width in the radial direction of the position detecting gear 71. Has been. In the present embodiment, the width of the narrow portion 75 is about ½ of the width of the wide portion 74. The upstream end 75a of the narrow portion 75 is formed in an arc shape that bulges outward in the circumferential direction of the position detection gear 71 in plan view. The downstream end 75 b of the narrow portion 75 is connected to the upstream end 74 a of the wide portion 74. A central angle α formed by the upstream end 75a, the downstream end 75b, and the central axis O1 of the narrow portion 75, that is, from the downstream end 75b of the narrow portion 75 to the upstream end 75a. The central angle α is set to 48 °, for example. The center angle α of the narrow portion 75 is set corresponding to the rotation angle of the position detection gear 71 when the step motor 35 is rotated by the first predetermined number of steps N1. In the present embodiment, the first predetermined number of steps N1 = 8.

The second transmission part 76 is provided corresponding to the reference position of the position detection gear 71. More specifically, the second transmission portion 76 is configured to have a position detection gear 71 when the position of a position detection sensor 80 constituted by a light emitting element 81 and a light receiving element 83 described later coincides with the position of the second transmission portion 76. The second hand 14 (see FIG. 1) interlocked with is provided so as to be a reference position indicating 0 second.
The second transmission portion 76 is provided at a peripheral portion of the position detection gear 71 upstream of the first transmission portion 73 and separated from the first transmission portion 73 by a predetermined distance. The second transmission part 76 is formed in a circular shape in plan view. The diameter of the second transmission part 76 is smaller than the width of the wide part 74 and larger than the width of the narrow part 75. Further, the second transmission portion 76 is formed such that its center C is separated from the central axis O1 of the position detection gear 71 by a distance r. The second transmission part 76 passes through the front and back of the position detection gear 71 and allows light to pass therethrough.

A region other than the first transmission portion 73 and the second transmission portion 76 in the position detection gear 71 is a light shielding portion 72 in which light cannot be transmitted.
Here, the central angle β formed by the upstream end 75a of the narrow portion 75, the center C of the second transmission portion 76, and the central axis O1, that is, the upstream end 75a of the narrow portion 75 is The central angle β up to the center of the two transmission parts 76 is set to 36 °, for example. The central angle β from the upstream end 75a of the narrow portion 75 to the center of the second transmission portion 76 is the rotation angle of the position detecting gear 71 when the step motor 35 is rotated by the second predetermined number of steps N2. Correspondingly set. In the present embodiment, the second predetermined number of steps N2 = 6.

The position detection sensor 80 includes a light emitting element 81 and a light receiving element 83.
The light emitting element 81 and the light receiving element 83 are each formed to have, for example, a circular shape having the same diameter in plan view. The centers of the light emitting element 81 and the light receiving element 83 are arranged at positions separated from the central axis O1 of the position detecting gear 71 by a distance r, and the light emitting element 81 and the light receiving element 83 are positioned at the position detecting gear 71. It is provided so that it may mutually oppose on both sides of. The diameters of the light emitting element 81 and the light receiving element 83 are smaller than the width of the wide part 74 of the first transmission part 73, larger than the width of the narrow part 75 of the first transmission part 73, and the diameter of the second transmission part 76. It is almost the same.

  As shown in FIG. 3, the light emitting element 81 is disposed on the front side of the movement 10 in the axial direction of the position detecting gear 71, and is fixed to the train wheel bridge 29, for example. The light emitting element 81 is configured by a semiconductor element such as an LED (Light Emitting Diode) capable of generating light or an LD (Laser Diode).

  The light receiving element 83 is disposed at a position corresponding to the light emitting element 81 on the back side of the movement 10 in the axial direction of the position detecting gear 71, and is fixed to the ground plane 20, for example. The light receiving element 83 is formed of a semiconductor element such as a photodiode having a photovoltaic effect by receiving light emitted from the light emitting element 81.

  As shown in FIG. 4, the position detection sensor 80 includes a light emitting element 81 and a light receiving element 83. When the position detection gear 71 rotates the position detection gear 71 at a predetermined speed, the light receiving element 83 receives the light emitted from the light emitting element 81 through the first transmission part 73 or the second transmission part 76, thereby The electromotive force is output as a signal to the integrated circuit 26 (see FIG. 2). In the present embodiment, the light receiving element 83 outputs a different voltage corresponding to the amount of light received through the first transmission portion 73 or the second transmission portion 76.

  Specifically, when the output of the light receiving element 83 is P (hereinafter simply referred to as “output P”), when the light shielding portion 72 is located between the light receiving element 83 and the light emitting element 81, the output P Becomes 0 (V). When the wide portion 74 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, and when the second transmission portion 76 is located between the light receiving element 83 and the light emitting element 81. , P is the maximum output value Pmax (V). When the narrow portion 75 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, the output P is larger than 0 (V) and smaller than the maximum output value Pmax (V). The first predetermined output value P1 (V) is obtained. In addition, when the boundary portion between the narrow portion 75 and the light shielding portion 72 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, the output P is larger than 0 (V). The second predetermined output value P2 (V) is smaller than the first predetermined output value P1 (V). When the boundary between the second transmission part 76 and the light shielding part 72 is located between the light receiving element 83 and the light emitting element 81, the output P is larger than the first predetermined output value P1 (V) and the maximum output. The third predetermined output value P3 (V) is smaller than the value Pmax (V).

FIG. 5 is a flowchart of the gear mechanism control method.
6 to 13 are plan views of the gear mechanism when viewed from the front side of the movement, and are explanatory views of the positional relationship between the first transmission part 73, the second transmission part 76, and the position detection sensor 80. In each drawing after FIG. 6, the light emitting element 81 and the light receiving element 83 are shown by two-dot chain lines.
Subsequently, the gear mechanism control method for detecting the reference position of the position detection gear 71 and the second hand 14 (see FIG. 1) by the gear mechanism 70 configured as described above will be described with reference to FIGS. It explains using. In the following description, refer to FIGS. 1 to 4 and FIGS. 6 to 13 for the reference numerals of the components.
As shown in FIG. 5, the gear mechanism control method includes a high-speed drive step S11 (corresponding to “first drive step” in the claims), a high-speed drive section determination step S13, a first output determination step S15, and a low-speed drive step. It includes a drive step S17 (corresponding to “second drive step” in the claims), a second output determination step S19, a step drive step S21, and a third output determination step S23.

(High-speed driving process S11)
In the high-speed driving process S11, the step motor 35 is rotated at the first predetermined rotation speed. Here, the first predetermined rotational speed is set to 96 Hz to 128 Hz, for example.

(High-speed drive section determination step S13)
In the high speed drive section determination step S13, it is determined whether or not the output P is 0 (V) (S13A), or whether or not the output P is the maximum output value Pmax (V) (S13B).
As shown in FIG. 6, when the light shielding portion 72 is located between the light receiving element 83 and the light emitting element 81, the output P = 0 (V), so “YES” is determined in step S <b> 13 </ b> A, The process proceeds to the first output determination step S15 while rotating the position detection gear 71 at the first predetermined rotation speed. Further, as shown in FIG. 8, when the wide portion 74 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, the output P = Pmax (V), and therefore in step S13A. It determines with "YES" and it progresses to 1st output determination process S15, rotating the position detection gear 71 by 1st predetermined rotation speed. On the other hand, for example, as shown in FIG. 7, when the boundary portion between the first transmission portion 73 and the light shielding portion 72 is located between the light receiving element 83 and the light emitting element 81, or as shown in FIG. When the narrow portion 75 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, it is determined as “NO” in Step S13A and Step S13B, and the high speed drive section determination step S13 is repeated. .

(First output determination step S15)
In the first output determination step S15, it is determined whether or not the output P is the first predetermined output value P1 (V) (S15A), and whether or not the output P = P1 (V) has continued for a predetermined time (S15B). To do.
As shown in FIG. 10, when the narrow part 75 of the first transmission part 73 is located between the light receiving element 83 and the light emitting element 81, the output P = P1 (V). "YES" is determined, and the process proceeds to step S15B. On the other hand, for example, as shown in FIG. 8, when the wide portion 74 of the first transmission portion 73 is positioned between the light receiving element 83 and the light emitting element 81, the output P = Pmax (V). In step S15A, “NO” is determined, and step S15A is repeated.
Next, in step S15B, for example, by counting the time t with a timer in the integrated circuit 26, it is determined whether or not the output P = P1 (V) has continued for a predetermined time tn. Here, the predetermined time tn is, for example, after detecting the output P = P1 (V) (that is, after the upstream end 75a of the narrow portion 75 is positioned between the light receiving element 83 and the light emitting element 81). The time until the intermediate portion between the upstream end portion 75a and the downstream end portion 75b of the narrow portion 75 is positioned between the light receiving element 83 and the light emitting element 81. When the output P = P1 (V) continues for the predetermined time tn, “YES” is determined in the step S15B, and the process proceeds to the low speed driving step S17. On the other hand, when the output P = P1 (V) does not continue for the predetermined time tn, it is determined as “NO” in step S15B, and step S15B is repeated.

(Low speed driving process S17)
In the low speed driving step S17, the step motor 35 is rotated at a second predetermined rotational speed lower than the first predetermined rotational speed. Here, the second predetermined rotation speed is set to 64 Hz to 96 Hz, for example.

(Second output determination step S19)
In the second output determination step S19, it is determined whether or not the output P is the second predetermined output value P2 (V). As shown in FIG. 11, when the boundary between the narrow portion 75 and the light shielding portion 72 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, the output P = P2 (V) Therefore, it determines with "YES" by 2nd output determination process S19, and progresses to step drive process S21. On the other hand, for example, as shown in FIG. 10, when the narrow portion 75 of the first transmission portion 73 is positioned between the light receiving element 83 and the light emitting element 81, the output P = P1 (V). Therefore, it determines with "NO" in 2nd output determination process S19, and 2nd output determination process S19 is repeated.

(Step drive process S21)
In step drive process S21, as shown in FIG. 12, after the second output determination process S19, the step motor 35 is rotated by a second predetermined number of steps N2.

(Third output determination step S23)
In the third output determination step S23, it is determined whether or not the output P is the third predetermined output value P3 (V). As shown in FIG. 13, when the boundary part between the second transmission part 76 and the light shielding part 72 is located between the light receiving element 83 and the light emitting element 81, the output P = P3 (V). It is determined as “YES” in the three-output determination step S23. After that, as shown in FIG. 14, the rotation of the step motor 35 is stopped, and the position detection gear 71 is set so that the center C of the second transmitting portion 76 and the centers of the light emitting element 81 and the light receiving element 83 coincide with each other. It is arranged at the reference position (see FIG. 4). This completes the gear mechanism control method. On the other hand, if the output P = P3 (V) is not satisfied due to a drive failure such as step-out of the step motor, for example, the gear mechanism control method is performed again as an error, and the flow is repeated.

FIG. 14 is a time chart of the gear mechanism control method. In FIG. 14, the vertical axis represents the output P, and the horizontal axis represents the timing T.
Next, a processing timing chart in the flowchart of the gear mechanism control method described above will be described. Refer to FIG. 5 for the process at each timing in the following description.

(Timing T101)
After starting the time chart, the position detecting gear 71 is rotated by driving the step motor 35 at the first predetermined rotational speed (high-speed driving step S11). Thereafter, when the wide portion 74 of the first transmission portion 73 is positioned between the light receiving element 83 and the light emitting element 81 (timing T101 in FIG. 14), the output P = Pmax (V).

(Timing T102)
After timing T101, as shown in FIG. 8, the step motor 35 is continuously driven at the first predetermined rotation speed (high-speed drive section determination step S13). After that, as shown in FIG. 9, when the boundary portion between the wide portion 74 and the narrow portion 75 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81, the output P decreases from Pmax. Begin to. Thereafter, when the narrow portion 75 of the first transmission portion 73 is positioned between the light receiving element 83 and the light emitting element 81 (timing T102 in FIG. 14), the output P = P1 (V) is obtained (step S15A).

(Timing T103)
After timing T102, the step motor 35 is driven for a predetermined time tn at the first predetermined rotation speed (low speed driving step S17). After a predetermined time tn has elapsed, the intermediate portion between the upstream end portion 75a and the downstream end portion 75b of the narrow portion 75 is positioned between the light receiving element 83 and the light emitting element 81 (timing T103 in FIG. 14). Thus, the step motor 35 is driven at a second predetermined rotational speed lower than the first predetermined rotational speed (low speed driving step S17).

(Timing T104)
After timing T103, the step motor 35 is driven at the second predetermined rotational speed. Thereafter, as shown in FIG. 11, at the time when the boundary portion between the narrow portion 75 and the light shielding portion 72 of the first transmission portion 73 is located between the light receiving element 83 and the light emitting element 81 (timing T104 in FIG. 14). , Output P = P2 (V) (second output determination step S19).

(After timing T104 to T106)
After timing T104, the step motor 35 is rotated by the second predetermined number of steps N2 (step drive step S21). At this time, as shown in FIG. 12, the position detecting gear 71 rotates in a state where the light shielding portion 72 is positioned between the light receiving element 83 and the light emitting element 81. The light receiving element 83 has an output P = 0 (V).
Subsequently, the output P of the light receiving element 83 starts to increase when the edge of the second transmission portion 76 reaches between the light receiving element 83 and the light emitting element 81 (timing T105 in FIG. 14).
Subsequently, as shown in FIG. 13, when the boundary portion between the second transmission part 76 and the light shielding part 72 is located between the light receiving element 83 and the light emitting element 81 (timing T <b> 106 in FIG. 14), the light receiving element 83. Output P = P3. The position detecting gear 71 is arranged at the reference position so that the center C of the second transmitting portion 76 of the position detecting gear 71 and the centers of the light emitting element 81 and the light receiving element 83 coincide (FIG. 4). reference). As a result, the second hand 14 (see FIG. 1) interlocked with the position detection gear 71 is disposed at the reference position indicating 0 second.

  According to the present invention, the position detecting gear 71 has a first transmission part 73 having a wide part 74 and a narrower part provided on the upstream side U in the rotational direction of the position detecting gear 71 in the circumferential direction than the wide part 74. Therefore, when the position detecting gear 71 is rotating, the light receiving element 83 has outputs 0, P1, P2, and P3 having different detection levels in the wide portion 74 and the narrow portion 75. , Pmax can be obtained. Thus, when the position detecting gear 71 rotates and the first transmitting portion 73 passes between the light emitting element 81 and the light receiving element 83, the wide portion 74 and the narrow portion 75 are detected to detect the position. The rotational position of the gear 71 can be obtained. Furthermore, since the second transmission part 76 is provided on the upstream side U from the first transmission part 73, after detecting the narrow part 75, the position detection gear 71 rotates to a reference position by rotating a predetermined angle. It can be foreseen that the corresponding second transmission part 76 is detected. Thereby, the gear mechanism 70 rotates the position detection gear 71 at a high speed when the wide portion 74 of the first transmission portion 73 is detected, and when the narrow portion 75 of the first transmission portion 73 is detected. Thus, the rotational speed of the position detecting gear 71 can be decreased, and the position detecting gear 71 can be reliably stopped when the second transmitting portion 76 is detected. Therefore, it is possible to provide the gear mechanism 70 that can accurately and quickly detect the reference position of the position detection gear 71.

  Further, since the drive source is the step motor 35, the rotation angle of the position detection gear 71 can be easily controlled by the number of drive pulses of the step motor 35. Therefore, the reference position of the position detecting gear 71 can be detected accurately and quickly.

  The central angle β from the upstream end 75a of the narrow portion 75 to the center C of the second transmission portion 76 is the rotation of the position detecting gear 71 when the step motor is rotated by the second predetermined number of steps N2. Since the angle is set according to the angle, the rotation from the narrow portion 75 to the second transmission portion 76 can be controlled by the number of drive pulses. Thereby, the light shielding part 72 between the narrow part 75 and the second transmission part 76 can pass between the light emitting element 81 and the light receiving element 83 reliably and quickly. Therefore, it is possible to provide the gear mechanism 70 that can accurately and quickly detect the reference position of the position detection gear 71.

  Further, since the outer shape of the light emitting element 81 is formed so as to be larger than the width of the narrow portion 75, a sufficient amount of light can be obtained, and the amount of light passing through the wide portion 74 and the narrow portion 75 can be obtained. The difference with the amount of light can be increased. Therefore, the light receiving element 83 can reliably detect the wide portion 74 and the narrow portion 75.

  Further, according to the gear mechanism control method of the present invention, the step drive step S21 for rotating the step motor 35 by the second predetermined number of steps N2 is performed between the second output determination step S19 and the third output determination step S23. Thus, the rotation angle of the position detection gear 71 can be easily controlled by the number of drive pulses, and the reference position of the position detection gear 71 can be detected accurately and quickly.

  Further, according to the present invention, it is possible to provide the movement 10 and the analog quartz timepiece 1 that can accurately and quickly detect the reference position of the position detecting gear 71. In addition, the movement 5 and the analog quartz type timepiece 1 capable of detecting and automatically correcting the position of the second hand 14 can be provided.

    The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.

  In the gear mechanism 70 of the embodiment, the fourth gear 62 of the fourth wheel 41 that is interlocked with the second hand 14 is used as a position detection gear 71, and the position of the second hand 14 that is interlocked with the position detection gear 71 is adjusted to the reference position. Although it is a mechanism, the pointer to be adjusted to the reference position is not limited to the second hand 14. Therefore, a gear mechanism for adjusting the hour hand 12 and the minute hand 13 to the reference position may be used. Further, the position detecting gear 71 may be a gear other than the fourth gear 62.

In the embodiment, the gear mechanism control method includes the first output determination step S15, and by counting the time t, it is determined whether or not the output P = P1 (V) has continued for a predetermined time tn, and the low speed driving is performed. The process has moved to step S17. On the other hand, for example, instead of the time t, the number of drive pulses of the step motor 35 is counted to determine whether the step motor 35 has rotated by a predetermined step and to shift to the low speed drive step S17. Also good.
In this case, the central angle α from the downstream end 75b to the upstream end 75a of the narrow portion 75 is the rotation of the position detecting gear 71 when the step motor 35 is rotated by the first predetermined number of steps N1. Since the angle is set according to the angle, the rotation angle of the position detecting gear 71 can be controlled by the number of drive pulses when the narrow portion 75 passes between the light emitting element 81 and the light receiving element 83. As a result, the narrow portion 75 can reliably and quickly pass between the light emitting element 81 and the light receiving element 83. Therefore, it is possible to provide the gear mechanism 70 that can accurately and quickly detect the reference position of the position detection gear 71.

  In the embodiment, the first transmission part 73 and the second transmission part 76 are each provided by forming a through hole in the position detection gear 71. On the other hand, for example, the position detecting gear 71 is formed of a light-transmitting member, and a region other than the first transmitting portion 73 and the second transmitting portion 76 is coated with a light-shielding paint or the like. The light shielding part 72, the first transmission part 73, and the second transmission part 76 may be provided.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Timepiece (Analog quartz type timepiece) 10 ... Movement 35 ... Step motor (drive source) 70 ... Gear mechanism 71 ... Position detecting gear 72 ... Shading part 73 ... First transmission part 74 ... Wide part 75 ... Narrow part 75a ... Upstream end part 75b ... Downstream end part 81 ... Light emitting element 83 ... Light receiving element N1 ... First 1 predetermined step number N2 ... second predetermined step number P1 ... first predetermined output value P2 ... second predetermined output value P3 ... third predetermined output value S11 ... high-speed driving process (first Driving process) S13: First driving process S15: First output determining process S17: Low speed driving process (second driving process) S19: Second output determining process S21: Step driving process S19 ... Third output judgment process

Claims (9)

A position detection gear that rotates by the power of the drive source;
A light emitting element provided on one side in the axial direction of the position detecting gear;
A light receiving element provided at a position corresponding to the light emitting element on the other side in the axial direction across the position detection gear;
With
The position detecting gear is
A light-shielding portion in which light from the light-emitting element is not transmitted;
A first transmission part that is capable of transmitting light from the light emitting element and extends along a circumferential direction of the position detection gear;
Light transmitted from the light emitting element can be transmitted; and a second transmission portion provided corresponding to a reference position of the position detection gear;
Have
The first transmission part has a wide part, and a narrow part provided on the upstream side in the rotation direction of the position detecting gear in the circumferential direction from the wide part,
The gear mechanism, wherein the second transmission part is provided on the upstream side of the first transmission part. The gear mechanism according to claim 1,
A gear mechanism characterized in that the drive source is a step motor. The gear mechanism according to claim 2,
The central angle from the downstream end of the narrow portion in the rotational direction to the upstream end of the narrow portion is the position when the step motor is rotated by a first predetermined number of steps. A gear mechanism characterized in that it is set in accordance with the rotation angle of the detection gear. The gear mechanism according to claim 2 or 3,
The central angle from the upstream end of the narrow portion to the center of the second transmission portion corresponds to the rotation angle of the position detecting gear when the step motor is rotated by a second predetermined number of steps. A gear mechanism characterized by being set as above. The gear mechanism according to any one of claims 1 to 4,
A gear mechanism, wherein an outer shape of the light emitting element is formed to be larger than a width of the narrow portion. A gear mechanism control method for controlling a gear mechanism according to claim 4,
When the light emitting element is at a position corresponding to the narrow portion, the output obtained from the light receiving element is a first predetermined output value,
When the light emitting element is at a position straddling the narrow part and the light shielding part at the upstream end of the narrow part, the output obtained from the light receiving element is a second predetermined output value,
When the light emitting element is at a position corresponding to the second transmission part, when the output obtained from the light receiving element is a third predetermined output value,
A first driving step of driving the step motor at a first predetermined rotational speed;
A first output determination step for determining whether the output obtained from the light receiving element is the first predetermined output value;
A second driving step of driving the step motor at a second predetermined rotational speed lower than the first predetermined rotational speed when the output obtained from the light receiving element is the first predetermined output value;
A second output determination step of determining whether or not the output obtained from the light receiving element is the second predetermined output value;
A third output determination step of determining whether or not the output obtained from the light receiving element is the third predetermined output value;
With
A gear mechanism control method comprising a step driving step of rotating the step motor by the second predetermined number of steps between the second output determination step and the third output determination step.   A movement comprising the gear mechanism according to any one of claims 1 to 5. The movement according to claim 7,
The movement according to claim 1, wherein the position detecting gear is interlocked with at least one of a second hand, a minute hand and an hour hand.   An analog quartz type timepiece comprising the movement according to claim 7 or 8.

Images