JPH11133164A - Radio wave corrected clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clock easy to assemble at a low cost by outputting the detection signal as the output signal from a first photo-sensor to a control system when a first light transfer section of a minute hand wheel, the second light transfer section of an hour hand wheel and the third transfer section of a rotation detecting plate are set to the correctly faced state respectively. SOLUTION: The same type item as the motor 21 of a second hand drive system 20 is reversionally arranged of the stepping motor 21 of a minute hand drive system 30, and it is rotatively driven in the direction of an arrow N. When a minute hand wheel is rotated in the direction of an arrow C, a rotation detecting plate 36 preventing the error caused by the relative backlash between the minute hand wheel and an hour hand wheel is rotated in the direction of an arrow S. When the minute hand wheel, rotation detecting plate 36 and hour hand wheel are rotated, the through hole of the minute and wheel, the through hole of the rotation detecting plate 36 and a light reflecting face formed on the hour hand wheel face each other in the correctly faced state. The light of an hour/minute hand position detecting sensor 80 reaches the light reflecting face formed on the hour hand wheel via the through holes of the minute hand wheel and rotation detecting plate 36, and the reflected light is received by a light receiving element, and the detection signal is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio-controlled timepiece that corrects time by receiving radio signals such as an hour signal and a time code signal.

[0002]

2. Description of the Related Art A radio-controlled timepiece has a function of receiving an hourly signal or a time code signal of a predetermined frequency emitted from a radio station or the like, and performing a so-called zero return based on the received signal. In general, a radio-controlled timepiece is provided with a hand position detecting device for accurately setting the hands to the correct hour at the time of zero return, and the difference between the displayed time with respect to the correct time is indicated by a second hand, an hour hand and a minute hand. And can be modified independently of each other. Therefore, the second hand, the hour hand and the minute hand are driven by separate motors.

In the minute hand wheel of a radio-controlled timepiece, a minute hand gear and a minute hand position detecting plate for detecting the position of the minute hand are generally mounted on a minute hand pipe, respectively. Has a slip structure. This allows the minute hand position detection plate and the minute hand pipe to move when the manual hand correction is performed by engaging the hand correction wheel that performs the manual hand correction with the minute wheel that rotates the hour hand according to the rotation of the minute hand. Since it rotates integrally, the phase shift between the through hole for detecting the position of the hour wheel and the light reflecting plate on the slit of the minute hand position detecting plate is eliminated.

[0004]

However, when a slip structure is used for the minute hand pipe, it is necessary to periodically perform torque management in order to keep the slip torque constant. In addition, in order to form the slip structure on the minute wheel, it is necessary to add various components. For this reason, troublesome torque management is required, and
The increase in cost due to the increase in the number of parts has been forced.

As described above, since the minute hand pipe is provided with the hour / minute hand position detecting plate in addition to the minute hand gear,
To engage the minute hand pinion of the minute hand and the minute wheel, the wheel train is assembled with the wheel teeth of the minute wheel inserted between the minute hand gear and the minute hand position detection plate. There is a need. For this reason, it is necessary to mount the minute hand wheel and the Hino minute wheel in a movement package in a state where they are meshed in advance, and there is a problem that the assembling work of the train wheel cannot be performed efficiently.

Further, in the conventional radio-controlled timepiece, since the above-described pointer position detecting device is mounted on the outer wall of the timepiece housing, the wiring is complicated, which also causes a reduction in work efficiency. Has become.

[0007] The present invention has been made in view of such circumstances, and its object is to facilitate assembly,
It is an object of the present invention to provide a radio-controlled timepiece which is inexpensive and can correct the time with high accuracy.

[0008]

In order to achieve the above object, a radio-controlled timepiece according to the present invention rotates a second hand wheel by reducing the rotation speed of a first motor to a predetermined speed by at least one gear. A second drive for reducing the rotation speed of the first drive system and the second motor to a predetermined speed by at least one gear, and rotating a minute wheel having a first light transmission portion formed at a predetermined position. System, an hour wheel in which a second light transmission portion is formed at a predetermined position so as to face the first light transmission portion of the minute hand wheel, and a rotational speed of the minute hand pipe is reduced to a predetermined speed, and A third wheel that rotates the hour wheel and a third light transmitting unit that is formed at a predetermined position so as to face the first light transmitting unit and the second light transmitting unit; A rotation detection plate that rotates according to the first and second rotation detection plates;
And a first optical sensor unit that obtains an output signal when the third optical transmission unit faces directly.

The radio-controlled timepiece of the present invention is preferably
The first light transmitting section of the minute hand and the third light transmitting section of the rotation detecting plate are each a through hole, and the second light transmitting section of the hour wheel is a light reflecting surface. The first optical sensor section is constituted by a reflection type optical sensor, and is arranged so as to exchange light with the third light transmitting section of the hour wheel through the through hole. Further, it is desirable that the rotation detection plate rotates at a high speed at a predetermined speed with respect to the rotation speed of the minute wheel.

According to the radio-controlled timepiece of the present invention, for example,
Upon receiving the hour signal from the radio station, the control system sends a return-to-zero operation instruction to the first drive system and the second drive system. The first drive system of the first drive system that has received the return-to-zero operation instruction
Is rotated clockwise or counterclockwise, for example, at high speed. The rotation speed of the first motor is reduced to a predetermined speed by a predetermined gear and transmitted to the second hand wheel.

Similarly, the second motor of the second drive system that has received the return-to-zero operation instruction is rotated, for example, at a high speed in a clockwise direction or a counterclockwise direction. The rotation speed of the second motor is reduced to a predetermined speed by a predetermined gear and transmitted to the minute wheel. The rotation of the minute hand wheel is transmitted to the Hino minute wheel by its kana portion to rotate the hour hand wheel.

Although the rotation detecting plate also rotates with the rotation of the minute hand pipe, the rotation detecting plate is preset so as to rotate 6 ° with respect to 1 ° rotation of the minute wheel.
Eventually, the first light transmitting portion of the minute hand wheel, the second light transmitting portion of the hour hand wheel, and the third transmitting portion of the rotation detecting plate face each other. At this time, a detection signal is output from the first optical sensor unit to the control system as an output signal. Thereby, the control system recognizes that the minute hand and the hour hand point to the hour. In this case, since the rotation detection plate rotates at a higher speed than the minute hand, the sensor does not erroneously detect light in a state where the phases of the minute hand and the hour hand have shifted due to backlash. You. As a result, the minute hand and the hour hand coincide with those at the time of the initial setting without causing an error, and the accurate hour positions of the minute hand and the hour hand are detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the position of a radio-controlled timepiece according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view for explaining the inside of the movement of the radio-controlled timepiece according to the present invention, FIG. 2 is a cross-sectional view showing the overall configuration of the movement of the radio-controlled timepiece according to the present invention, and FIG. FIG. 4 is a view exemplifying a pattern of forming a through hole of a minute hand wheel or a rotation detecting plate according to the present invention, FIG. 4 is a view exemplifying a light reflecting surface forming pattern of an hour hand wheel according to the present invention, and FIG. FIG. 2 is a side view of a main part of the movement of the radio-controlled timepiece as viewed from an arrow X shown in FIG. 1.

As shown in FIGS. 1 and 2, the radio-controlled timepiece 10 has a middle plate 12 disposed substantially at the center of a space formed by a lower plate 11 and an upper plate 13, and a lower plate in the space. Board 11,
The second hand drive system 20, the minute hand drive system 30, the hour hand wheel 40, the minute wheel 50,
The manual correction shaft 60, the second hand position detection sensor 70, and the hour / minute hand position detection sensor 80 are fixed or pivotally supported. On the upper surface of the middle plate 12, a circuit board 14 is attached in close contact with the middle plate 12, and on the circuit board 14, a second hand position detection sensor 70, an hour / minute hand position detection sensor 80, a control device (not shown), and the like are provided. Are located.

The second hand drive system 20 includes a stepping motor 2
1, a first fifth wheel 22 and a second hand wheel 23. The stepping motor 21 is mounted on the circuit board 14, and is arranged so as to surround the rotor 21b.
A stator 21a for forming a magnetic field and generating a rotational force according to the direction of the magnetic field to rotate the rotor 21b, and a rotor 21 for transmitting a driving force to the wheel train based on the rotational force
b, and a bobbin 21c forming a motor coil,
Both ends of the rotor 21b are pivotally supported between the upper plate 13 and the middle plate 12.

The stator 21a is connected to two motor lead pins 21d for supplying a drive current to a motor coil.
It is mounted on a circuit board 14. First 5th car 2
2 is rotatably supported by the middle plate 12 and the upper plate 13, and the wheel teeth are meshed with the rotor 21 b of the stepping motor 21,
The rotation speed of the rotor 21b is reduced to a predetermined speed.

The second hand wheel 23 has one end of its shaft portion
The other end penetrates the middle plate 12 to the lower plate 11 side,
The second hand shaft 23a is press-fitted to the other end side, and the wheel teeth portion is meshed with the pinion of the first fifth wheel & pinion 22 so that the second hand shaft 23a makes one rotation in 60 seconds, that is, one step becomes 6 °. Second hand axis 2
3a is inserted through a through hole 35b of a minute hand pipe 35a which penetrates a lower plate 11 to be described later and protrudes to a surface side on which a timepiece dial and the like are formed, and a second hand (not shown) is attached to a tip end thereof.

A light reflecting surface 23b is formed on the second hand wheel 23 so as to face the second hand position detecting sensor 70 disposed on the circuit board 14. The second hand drive system 20 described above is configured so that the second hand points to the hour when the light reflecting surface 23b faces the second hand position detection sensor 70.

The second hand position detecting sensor 70 has a light emitting element composed of a light emitting diode and a light receiving element composed of an npn transistor arranged side by side. The light emitting part of these light emitting elements and the light receiving surface of the light receiving element are formed on the second hand wheel 23. Light reflecting surface 2
3b is provided on the circuit board 14 so as to be opposed to 3b. The second hand position detection sensor 70 controls the not-shown high-level detection signal only when the light emitted from the light emitting element is reflected by the light reflecting surface 23b formed on the second hand wheel 23 and when the reflected light is received. Output to the system.

The minute hand drive system 30 includes a stepping motor 21 of the same type as that used in the second hand drive system 20,
It is constituted by a second wheel 32, a third wheel 33 and a minute hand wheel 35. In the present embodiment, as shown in FIG.
A rotation detection plate 36 that is supported on the lower plate 11 and meshes only with the minute hand wheel 35 is provided.

The stepping motor 21 has a second hand drive system 2
0, the stator 21a being mounted on the circuit board 14 and disposed to surround the rotor 21b, as described above, and the rotor 21b transmitting the driving force to the wheel train. , And both ends of the rotor 21b are pivotally supported between the upper plate 13 and the middle plate 12. Stator 2
Similarly to the second hand drive system 20, 1a is mounted on the circuit board 14 via two motor lead pins 21d.

The second fifth wheel & pinion 32, like the first fifth wheel & pinion 22, is pivotally supported by the middle plate 12 and the upper plate 13, and the wheel teeth are meshed with the rotor 21b of the stepping motor 21. The rotation speed of the rotor 21b is reduced to a predetermined speed.
The stepping motor 21 is controlled so that one step is performed in 10 seconds. The third wheel & pinion 33 is provided with one end of a shaft portion pivotally supported by the upper plate 13 and the other end thereof penetrating the middle plate 12 to the lower plate 11 side. It is engaged with the kana portion of the car 32.

The minute hand wheel 35 has a substantially T-shape with a through hole 35b formed in the center. One end of the minute hand pipe 35a is supported by the middle plate 12 and the other end of the minute hand pipe 35a is supported by the lower plate 11. The hour hand wheel 40 is inserted through a through hole 40b of an hour hand pipe 40a of the hour wheel 40, and a minute hand (not shown) is attached to a tip end of the hour hand wheel 40. The minute hand wheel 35 makes one rotation every 60 minutes, that is, 1 ° per step.
Further, as described above, the second hand shaft 23a is inserted through the through hole 35b, and its ring tooth portion is meshed with the pinion portion of the third wheel & pinion 33. As shown in FIG. 3, the minute hand 35 has a through hole 35c for transmitting the light generated by the hour / minute hand position detection sensor 80 to a light reflecting surface 40c formed in the hour hand 40 described later.

The rotation detecting plate 36 is supported by a projection 11a formed on the lower plate 11, and the wheel teeth of the rotation detecting plate 36 are engaged with the minute hand wheel 35. Rotation detection plate 36
Is configured to rotate once every 10 minutes, that is, at 6 ° per step. Therefore, the rotation detection plate 36 rotates at the same step angle as the second hand wheel 23. As shown in FIG. 3, similarly to the minute hand wheel 35, the rotation detecting plate 36 transmits light generated by the hour / minute hand position detection sensor 80 to a light reflecting surface 40c formed on the hour wheel 40 described later. A hole 36a is formed.

The hour wheel 40 has a substantially T-shape with a through hole 40b formed in the center, and the wheel teeth are disposed in the timepiece body 10, and the hour hand pipe 40a extends through the lower plate 11. An hour hand (not shown) is attached to the tip of the watch, protruding toward the dial of the watch. The wheel tooth portion of the hour wheel 40 is configured to rotate 30 ° in one hour and one rotation in 12 hours, and the minute hand pipe 35a is inserted through the through hole 40b as described above.

As shown in FIG. 4, a surface 40c of the hour hand wheel 40 facing the minute hand wheel 35 and the rotation detecting plate 36 is provided.
One light reflection surface 23b is formed so as to face the hour / minute hand position detection sensor 80 embedded in the middle plate 12.

The minute wheel 50 is pivotally supported by a protruding portion 11b formed on the lower plate 11, and its wheel teeth mesh with the minute hand pinion of the minute hand wheel 35, and the pinion part is the wheel tooth of the hour hand wheel 40. The rotation speed of the minute hand wheel 35 is reduced to a predetermined speed and transmitted to the hour wheel 40. The Hino reverse wheel 50 is N
(N is a positive integer) and is configured to make one revolution in time.
It is arranged to mesh with.

The manual correction shaft 60 has a substantially T-shape, and the correction pin 60a at the tip is pivotally supported by a protrusion 11c formed on the lower plate 11. Head 60b of manual correction shaft 60
Is arranged so as to be accessible from the outside of the watch main body 10 through a hole (not shown) provided in the upper plate 13.

The manual correction shaft 60 is configured to rotate once every 60 minutes in the same phase as that of the minute hand wheel 35, and as described above, the wheel tooth portion of the Hino minute wheel 50 with respect to the correction pinion 60a. When the minute hand wheel 35 is driven by the minute hand drive system 30, the minute hand wheel 3 is
5, and when the minute hand drive system 30 is not operated, by rotating the head 60b, the positions of the hour hand and the minute hand can be manually corrected.

The hour / minute hand position detecting sensor 80 includes a light emitting element composed of a light emitting diode and a light receiving element composed of an npn transistor arranged side by side. A light emitting portion of the light emitting element and a light receiving surface of the light receiving element are formed on the minute hand wheel 35. Through hole 35
c, through holes 36 formed in the rotation detecting plate 36
It is arranged on the substrate 14 so as to face the light reflecting surface 40c formed on the hour wheel 40 via a.

The hour / minute hand position detecting sensor 80 detects that light emitted from the light emitting element reaches the light reflecting surface 40c formed in the hour wheel 40 through the through hole 35c and the through hole 36a, and the light reflecting surface 40c Through the hole 3
A high-level detection signal is output to a control system (not shown) only when light is received by the light receiving element through the hole 5c and the through hole 36a.

The light reflecting surface 4 formed on the hour wheel 40
0c, the relationship between the through hole 35c of the minute hand wheel 35 and the through hole 36a of the rotation detecting plate 36 is such that the minute hand and the hour hand (not shown) are correct when the light reflecting surface 40c is directly opposed to the through hole 35c and the through hole 36a. It is set to point to the hour.

Next, the positional relationship between the two stepping motors 21 according to the present embodiment and a method of attaching the two stepping motors 21 to the circuit board 14 will be described. As shown in FIG. 1, the stepping motor 21 constituting the second hand drive system 20 is disposed at one end of the circuit board 14 such that the rotor 21b meshes with the wheel teeth of the first fifth wheel & pinion 22. The stepping motor 21 constituting the minute hand drive system 30 is disposed on the other end side of the circuit board 14 so that the rotor 21b meshes with the wheel teeth of the second fifth wheel & pinion 32.

[0034] The two stepping motors 21 are disposed with a substantially line-symmetric positional relationship with respect to a perpendicular passing through the rotation center O. In such an arrangement,
Bobbin 2 of stepping motor 21 of each drive system
1c is in a state facing outward.

That is, assuming that the stator 21a of the stepping motor 21 of the second hand drive system 20 shown in FIG. 1 faces the front surface, the stator 21a of the stepping motor 21 of the minute hand drive system 30 faces the back surface. . Therefore, as can be seen from the directions of the arrows L and N shown in FIG. 1, the rotation directions are also opposite. Thus, when the timepiece is viewed from the front of a dial (not shown), the second hand, the minute hand and the hour hand have the same hand movement direction.

Each stepping motor 21
Is mounted on the circuit board 14 via the motor lead pins 21d as described above. In addition, the motor lead pin 21d passes through the bobbin 21c,
The tip protrudes from both sides of the bobbin 21c. The motor lead pin 21d supplies a drive current to the stator 21a of the stepping motor 21.
4 is soldered through the back surface side.

As shown in FIG. 5, the bobbin 21c of the stepping motor 21 is provided with receiving surfaces 210c for abutting the circuit board 14 to stabilize the stepping motor 21 on both sides of the bobbin 21c. This allows
Regardless of which side of the stepping motor 21 faces the surface of the stator 21a, the circuit board 1
4 can be soldered. Therefore, if the bobbin 21c is disposed on the circuit board 14 by inverting the minute hand side stator 21a with respect to the second hand side stator 21a, the second hand and the hour / minute hand move in the same direction, and the second hand drive system 20 A common motor can be used for the minute hand drive system 30 and the minute hand drive system 30.

Next, the operation of the radio-controlled timepiece 10 according to the above configuration will be described. For example, when an hour signal from a radio station is received by a radio wave reception system (not shown), a return-to-zero operation instruction is sent from a control system (not shown) to the second hand drive system 20 and the minute hand drive system 30.

The stepping motor 21 of the second hand drive system 20 that has received the return-to-zero operation instruction is rotated, for example, at a high speed in the clockwise direction or the counterclockwise direction indicated by the arrow L in FIG. In the present embodiment, the stepping motor 21 of the second hand drive system 20 is driven to rotate clockwise. Stepping motor 21 of second hand drive system 20
The rotation speed of the rotor 21b is reduced to a predetermined speed by the first fifth wheel & pinion 22 and transmitted to the second hand wheel.

Rotation of the first fifth wheel & pinion 22 in the direction of arrow M;
With the rotation of the second hand wheel 23 in the direction of the arrow C, the light reflecting surface 23b of the second hand wheel 23 and the second hand position detection sensor 70 embedded in the circuit board 14 are opposed to each other, and are in a state of being directly opposed. At this time, the light emitted from the light emitting element of the second hand position detection sensor 70 is applied to the light reflecting surface 23 of the second hand wheel 23.
b, where it is reflected. This reflected light is received by the light receiving element. As a result, a high-level detection signal is output to a control system (not shown).

Thus, the control system recognizes that the second hand (not shown) points to the hour. Since the step angle of the second hand wheel 23 is as large as 6 ° and the second hand drive system 20 does not have a slipping mechanism, the hour position of the second hand is detected very accurately and the second hand is returned to zero.

Similarly, the stepping motor 21 of the minute hand drive system 30 which has received the return-to-zero operation instruction is rotated, for example, at a high speed in a clockwise direction or a counterclockwise direction indicated by an arrow N in FIG. In the present embodiment, the minute hand drive system 3
Since the zero stepping motor 21 is the same type of the stepping motor 21 of the second hand drive system 20 and is arranged upside down, the shape of the stator is upside down and is rotated counterclockwise.

Stepping motor 41 of minute hand drive system 30
The rotation speed of the rotor 41b is reduced to a predetermined speed by a second fifth wheel & pinion 42, further reduced by a third wheel & pinion 33, and transmitted to the minute hand wheel. Due to the arrangement of the motors and the meshing of the gear train, the minute hand wheel is driven in the same direction as the second hand wheel.

Rotation of the second fifth wheel & pinion 32 in the direction of arrow P;
Also, with the rotation of the third wheel & pinion 33 in the direction of the arrow Q, the minute hand wheel 35 is rotated in the direction of the arrow C similarly to the second hand wheel 23. Note that, with the rotation of the minute hand wheel 35 in the direction of arrow C, the rotation detection plate 36 provided in the present embodiment for preventing an error due to a relative backlash between the minute hand wheel 35 and the hour hand wheel 40 is provided by an arrow. It is rotated in the S direction.

The rotation of the minute hand wheel 35 in the direction of arrow C is transmitted to the minute wheel 50 by the minute hand pinion portion of the minute wheel 35, and the minute wheel 50 is rotated in the direction of arrow R. 5
Correction pinion 60a of the manual correction axis 60 via the 0 tooth portion
Is transmitted to Then, it is finally transmitted to the hour hand wheel 40 via the pinion of the minute wheel 50. At this time, since the manual correction shaft 60 has the same phase as the minute hand pinion of the minute hand wheel 35, it rotates at the same speed as the minute hand wheel 35, and the hour wheel 40 rotates at the reduced speed.

With the rotation of the minute hand wheel 35, the rotation detecting plate 36 and the hour wheel 40, the through hole 35 c of the minute hand wheel 35, the through hole 36 a of the rotation detecting plate 36, and the light reflecting surface 40 c formed on the hour wheel 40 are formed. However, they face each other and face each other. At this time, the light emitted from the light emitting element of the hour / minute hand position detection sensor 80 reaches the light reflecting surface 40c formed on the hour wheel 40 via the through holes 35c and 36a, and is reflected there. This reflected light is received by the light receiving element through the through holes 35c and 36a. As a result, a high-level detection signal is output to a control system (not shown).

Thus, the control system recognizes that the minute hand and the hour hand (not shown) point to the hour. The minute hand wheel 35 is decelerated to 1 ° per step by a train of wheels, but a rotation detecting plate 36 that rotates at 6 ° one step 6 ° is disposed between the through hole 35c and the light reflecting surface 40c. Since the through hole 36a of the rotation detecting plate 36 has the same step angle as that of the second hand wheel 23, the opposing positions of the through holes 35c and 36a and the light reflecting surface 40c coincide with each other without an error at the time of initial setting. Therefore, the exact positions of the minute hand 35 and the hour hand 40 are detected very accurately.

At the time of manual correction, the manual correction axis 6
The zero head 60b is manually rotated clockwise or counterclockwise. The rotation of the manual correction shaft 60 is transmitted to the minute hand pipe 35a of the minute hand wheel 35 via the minute wheel 50 and the hour hand wheel 40 is
Is transmitted to At this time, the minute hand gear, minute hand pinion and minute hand pipe 35a of the minute hand wheel 35 are integrally formed, and there is no slip mechanism.
The center wheel & pinion 33, the second fifth wheel & pinion 32, and the rotor 21b rotate.

Since the minute hand wheel 35 does not have a slip mechanism, the minute hand pipe 35a, the rotation detecting plate 36, and the hour hand wheel 40 have the same phase, so that the opposing positions of the through holes 35c, 36a and the light reflecting surface 40c. Match at the time of initial setting without causing an error. Therefore, the minute hand 35
And the hour position of the hour hand 40 is detected.

As described above, according to the present embodiment, the stepping motor 21 is disposed at a position substantially symmetrical with respect to a straight line passing through the rotation center O of the hands, and the stepping motor 21 for the second hand drive system 20 is provided. The motor 21 is used as the stepping motor 21 of the minute hand drive system 30. Thereby, since the stepping motor 21 is shared, diversification due to a difference in the arrangement position of the stepping motor 21 is prevented. Further, by the arrangement of the stepping motor 21 described above, the stepping motor 2
Since the direction of rotation of 1 is reversed in each drive system, an intermediate wheel that has conventionally been interposed between the minute hand wheel 35 and the third wheel 33 is unnecessary, and the hand movement directions of the second, minute and hour hands are the same. Become. As a result, manufacturing costs are reduced, the movement is easily assembled, and work efficiency is improved.

According to the present embodiment, the rotation detecting plate 36 is provided in an empty space of the wheel train instead of the above-described conventional intermediate wheel. Thereby, an error due to the relative backlash between the minute hand wheel 35 and the hour hand wheel 40 that occurs when the hour and minute hands return to zero is suppressed. As a result, the zero-return accuracy of the hour and minute hands is improved.

According to the present embodiment, the stepping motor 21 is mounted on the circuit board 14 with the motor lead pins 21d through the lead pin holes formed in the bobbin 21c. Thus, the stepping motor 21 can be easily assembled to the circuit board 14 and the unitization of the stepping motor 21 can be realized. As a result,
Assembly work is simplified, and work efficiency is improved.

According to the present embodiment, the bobbin 21c of the stepping motor 21 has the receiving surfaces 210c abutting on the circuit board 14 formed on both sides of the bobbin 21c. Accordingly, the stepping motor 21 can be stably fixed regardless of which surface is brought into contact with the circuit board 14.

According to the present embodiment, the two stepping motors 21, the second hand position detection sensor 70, and the hour / minute hand position detection sensor 80 are all disposed on one circuit board 14. As a result, complicated wiring can be collected in one place, so that the efficiency of assembly work is improved.

In this embodiment, the through hole 36a of the rotation detecting plate 36 is arranged between the through hole 35c of the minute hand wheel 35 and the light reflecting surface 40c of the hour wheel 40. The position of the through hole 36a is not limited to this. For example, it may be arranged between the through hole 35c and the hour / minute hand position detection sensor 80.

The wheel train is arranged as shown in FIGS. 6 and 7, and a third wheel 133 and a minute hand 135 are provided between the third wheel 133 and the minute hand wheel 135.
And the same through hole as the third wheel 33 shown in FIG.
4 and may be disposed so as to face each other between the through hole of the minute hand wheel 135 and the light reflecting surface of the hour wheel 140. FIG. 6 is a front view for explaining the positions of the position detecting through-hole and the light reflecting surface in the radio-controlled timepiece according to another embodiment, and FIG. 7 is a side view of the radio-controlled timepiece shown in FIG. FIG.

[0057]

According to the present invention, the minute hand and the hour wheel each provided with the light transmitting section, and the light transmitting section for detecting the position of the hour / minute hand are provided, and rotate at high speed in accordance with the rotation of the minute hand. A rotation detection plate, and detects the position of the hour / minute hand when each light transmission unit faces the rotation detection plate. As a result, an error caused by the relative backlash between the minute hand and the hour hand that occurs at the time of returning to zero is suppressed, and as a result, the accuracy of returning the hour and minute hands to zero is improved.

According to the present invention, the minute hand wheel and the rotation detecting plate have through holes as light transmitting portions, and the hour hand wheel has light reflecting surfaces as light transmitting portions. This allows
Since the light from the reflection type optical sensor is transmitted and received through each through hole and the light reflection surface, the position of the hour and minute hands is detected, and errors due to the relative backlash between the minute and hour hands are suppressed. . As a result, the zero-return accuracy of the hour and minute hands is improved.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining the inside of a movement of a radio-controlled timepiece according to the present invention.

FIG. 2 is a cross-sectional view showing the entire configuration of the movement of the radio-controlled timepiece according to the present invention.

FIG. 3 is a view exemplifying a formation pattern of a through hole of a minute hand wheel or a rotation detecting plate according to the present invention.

FIG. 4 is a diagram illustrating a pattern for forming a light reflecting surface of the hour wheel according to the present invention.

5 is a side view of a main part of the movement of the radio-controlled timepiece according to the present invention, as viewed from the direction of arrow X shown in FIG. 1;

FIG. 6 is a front view for explaining positions of a through hole for position detection and a light reflecting surface in a radio-controlled timepiece according to another embodiment.

FIG. 7 is a side view of the radio-controlled timepiece shown in FIG. 6;

[Explanation of symbols]

 10, 100 ... radio-controlled timepiece 11, 111 ... lower plate 11a to 11c ... protruding portion 12, 112 ... middle plate 13, 113 ... upper plate 14, 114 ... substrate 20, 120 ... second hand drive system 21, 121 ... first Stepping motor 21a Stator 21b Rotor 21c Bobbin 21d Motor lead pin 22, 122 First fifth wheel 23, 123 Second hand wheel 23a Second hand shaft 23b Light reflecting surface 30, 130 Minute hand drive system 32, 132 ... second fifth wheel 33,133 ... third wheel 35,135 ... minute hand wheel 35a ... minute hand pipe 35b ... through hole 35c ... through hole 36 ... rotation detection plate 36a ... through hole 40, 140 ... hour hand wheel 40a hour hand pipe 40b penetrating opening 40c: light reflecting surface 50, 150: Hino wheel 60, 160: manual correction shaft 60a: correction kana part 60b: head 70, 170 ... seconds Position detection sensor 80, 180 ... time minute hand position detection sensor 134 ... intermediate wheel

Claims (3)

[Claims] 1. A first drive system for rotating a second hand wheel by reducing a rotation speed of a first motor to a predetermined speed by at least one gear, and a rotation speed of a second motor by at least one gear. A second drive system for decelerating to a predetermined speed and rotating a minute hand wheel having a first light transmitting portion formed at a predetermined position, facing a first light transmitting portion of the minute wheel at a predetermined position; An hour wheel in which the second light transmitting portion is formed as described above; a Hino minute wheel that rotates the minute wheel to reduce the rotation speed of the minute hand pipe to a predetermined speed; and the first light in a predetermined position. A third light transmission unit formed to face the transmission unit and the second light transmission unit, and a rotation detection plate that rotates in accordance with the rotation of the minute hand wheel; the first, second, and third rotation detection plates; A radio wave having a first optical sensor unit for obtaining an output signal when the optical transmission unit faces directly Positive watch. 2. The first light transmitting portion of the minute hand wheel and the third light transmitting portion of the rotation detecting plate are through holes, respectively, and the second light transmitting portion of the hour hand wheel is a light reflecting surface. The first optical sensor unit is configured by a reflective optical sensor, and is arranged so as to exchange light with a third optical transmission unit of the hour wheel via the through hole. Radio correction clock. 3. The rotation detection plate according to claim 1, wherein the rotation detection plate rotates at a predetermined speed with respect to the rotation speed of the minute hand wheel.
The radio-corrected clock described.