JPS5858898B2 - Electronic clock step motor drive device - Google Patents

Description

Detailed Description of the Invention The present invention provides an electronic timepiece using a step motor in which one of two polarized rotors arranged in relation to each other is placed within a magnetic field generated by an air-core field coil. , relates to the structure of a circuit that controls current to a drive coil.

Conventionally, in such a device, a drive rotor is rotatably supported by, for example, two rotating support plates, and an air-core field coil is inserted and fixed in the support plates to control the current to the coil. The circuit elements used for this purpose were individually assembled into a unit on a printed wiring board or the like. After this unit was attached to the board by a coupling element separate from the coil, the respective circuit elements were electrically connected to each other by lead wires or the like.

However, in such devices, the circuit unit and coil are each assembled separately, so when checking the operation of the circuit, it is necessary to connect the equivalent load and operate it again, and the checking process had a very serious drawback.

Furthermore, if it is desired to check the operation of the rotor before assembling the entire device, it is cumbersome that, contrary to the above, a dummy circuit must be connected to the coil.

Furthermore, in the conventional type, after assembling the drive rotor, the coil had to be inserted from a direction perpendicular to the drive rotor, making the assembly process very complicated.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and includes a drive rotor disposed in the hollow part of a coil frame around which an air-core coil is wound, a circuit element for controlling the current to the coil, and a circuit element for controlling the current to the coil. This is achieved by placing both on the same printed board.

The structure of the present invention will be explained below based on illustrated embodiments.

First, the embodiment shown in FIGS. 1 and 2 will be described.

Pillars 2 are planted on the lower plate 1. This pillar 2 has an upper plate 3
is fixed with screws 4.

The lower plate 1 is fixed to the boss 20a of the case 20 with screws 21.

The shafts 5, 6 and the second hand shaft 7 are rotatably supported by the lower plate 1 and the upper plate 3.

An auxiliary polarized rotor 8 (hereinafter referred to as the 20th rotor) having two poles, N and S, magnetized on its peripheral edge is fixed to the shaft 5, and a first pinion 9 is also fixed thereto.

An intermediate gear 10 meshing with this pinion 9 is fixed to the shaft 6 together with a second pinion 11.

Fixed on the second hand shaft 7 are a seconds unit gear 12 that meshes with the second pinion 11, and a third pinion 13 that meshes with a gear train well known in timepieces, although not shown.

On the other hand, 14 is a coil frame around which a coil L is wound, and a U-shaped guide groove 14b is formed in the brim 14a.

Furthermore, a hollow portion 14e formed at the center of the coil frame 14
A first groove 14c and a second groove 14d are formed on the upper and lower surfaces.

On the other hand, a drive polarized rotor 16 (hereinafter referred to as the 10th rotor) fixed to the shaft 15 has two poles, N and S, magnetized on its peripheral edge.

18 is a rotor holding member with a 1ga collar on top and bottom.
18b is formed in a U-shape.

The tenth rotor 16 and the rotor pressing member 18 formed in this way are first placed against the coil frame.
6 is inserted into the hollow part of the coil frame 14 so that its shaft 15 is associated with the first and second grooves 14c and 14d of the coil frame 14.

Next, the rotor pressing member 18 has a collar 18a.

18b is inserted into the hollow portion of the coil frame 14 while engaging with the groove.

The amount of insertion is determined by the projection 18C of the holding member hitting the end surface of the coil frame.

At this time, a reasonable clearance is maintained between the shaft 15 of the tenth turret and the tip of the buckwheat of the holding member.

Therefore, the tenth rotor 16 is rotatably supported within the hollow portion of the coil frame 14.

Furthermore, the planar positional relationship between the 10th tar 16 and the 20th tar 8 is such that the two terminals 16°8 are magnetically coupled, and the coil L is generated in the direction of the magnetic field in which the two terminals attract each other. They are arranged so that the direction of the magnetic field is shifted by a certain angle as described later.

Next, the configuration of the circuit section that controls the current applied to the coil will be explained.

A crystal resonator X, a frequency divider IC1 capacitor C, and a trimmer capacitor TC are attached to the right half of the printed board 23 by soldering and electrically connected to form a known counter circuit.

On the other hand, the width of the outer periphery of the left half of the printed board is narrower than that of the right half, and a step 23a is formed at the border thereof, and a protrusion 23b is formed at the center of the upper side.

Then, the guide groove 14b of the coil frame is inserted into the printed board configured as described above while being guided by the upper and lower sides of the printed board 23 and its thickness, and the guide groove 14b guides the protrusion 23b of the printed board. He is pushed until he gets over it.

Thereby, the coil frame 14 is fixedly attached to the printed board 23.

At this time, the rotor holding member 18 is held down by the printed board 23, so that it will not be pulled out by the coil frame 14.

Thereafter, the terminals of the coil L are connected to the patterns 23c and 2 of the output end of the counter circuit formed on the printed board 14.
3d is soldered.

In this manner, the printed board unit including the coil L is fixed by pushing the printed board 23 into the bifurcated boss 20b protruding from the case 20 described above.

Next, the operation of the device constructed as described above will be explained.

When no current flows through the coil L, the N and S poles of the 10th turner 16 and the N and S poles of the 20th turner 8 are on a straight line connecting their respective axes at 15°5 when viewed in plan. The straight lines are arranged at an angle of about 45° to the direction of the magnetic field generated by the coil L.

When a current is applied to the coil L in this state, a magnetic field is generated in the coil L, and the 10th-tar 16 starts rotating due to the magnetic field, and the 20th-tar 16, which is in an attractive relationship with the 10th-tar 16, starts rotating.
The 10th motor 8 also follows the pole of the 10th motor 16.
- starts rotating in the opposite direction to the motor 16.

As a result, the 10th target 16 and the second
The 0-tar 8 is rotated half a turn and then stopped.

Then, until a current is applied to the coil L in the opposite direction to the magnetic field generated by the coil L described above, the terminals 16
, 8 continues to stop.

Therefore, when a power source is connected to the input cover turns 23e and 23f formed on the printed board 23, an alternating current is applied from the electric circuit to the coil L every second, and the magnetic field causes the tenth turner 16 to generate an alternating current of 1800 per second. This rotation is transmitted to the 20th turret 8 which is magnetically coupled to the 10th turret, and the 20th turret 8 is rotated at a rate of 1800 per second.

This rotation is transmitted to the intermediate gear 10 via the first pinion 9 fixed to the 20th gear 8, and further transmitted to the second gear 12 via the second pinion 11, so that the second gear 12 rotates every second. It can be rotated by 6 degrees.

Since the wheel train is configured to rotate in a manner generally known for watches, a description of its operation will be omitted.

In FIG. 1 of the above embodiment, the 10th turner is placed in the hollow part of the coil frame around which the coil is wound, one end of the hollow part is sealed with a printed board, and the other end is open. By forming a sealed wall integrally with the coil frame at the other end of the coil frame, it is possible to prevent foreign matter such as dust from entering the shaft of the 10th turner, which is the drive source, so the printed board, coil, etc. are connected. The unit is excellent in dust resistance, easy to handle during the assembly process, and has high reliability against malfunction of the 10-ter due to foreign matter such as dust.

In addition, since the coil frame is formed of a non-magnetic material such as a plastic material, even if the above-mentioned sealing wall is provided, the 10th-couple and the 20th-couple
There is no effect on Ku's magnetic coupling.

As described above, the present invention not only achieves the above objects, but also facilitates the construction of an electronic timepiece, is economical, and has excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the first embodiment, and FIG. 2 is a partial side view of FIG. 1. In the figure, 1...lower plate, 3...upper plate, 8...20th ter, 12...second unit wheel, 16... ...10th-ter 14...
...Coil frame, 23...Printed board.

Claims (1)

[Claims] 1. An air-core field coil, a driving polarized rotor, an auxiliary polarized rotor arranged in a state of magnetic coupling with the driving polarized rotor, and a hollow part provided in the center around which the air-core field coil is wound. a coil frame, the direction of the magnetic field generated when the air-core field coil is energized relative to the direction of the magnetic field in which the driving polarized rotor and the auxiliary polarized rotor attract each other when the air-core field coil is in a non-excited state; In an electronic timepiece using a step motor, the step motor is arranged such that the coils are shifted by a certain angle, and output is obtained from an auxiliary polarized rotor that is interlocked with a drive polarized rotor that rotates synchronously by the magnetic field of the air-core field coil. The drive polarized rotor is rotatably housed in a coil frame around which the coil is wound, and a wiring board is provided to seal one end of the hollow part of the coil frame, and the coil is controlled on the wiring board. A step motor drive device characterized by having a circuit element installed therein.