JPH0815465A - Electronic wristwatch having vibrating motor - Google Patents

Abstract

PURPOSE:To inform a user of the time set by him, by vibration, without lessening the area of display of a watch, by a construction wherein an eccentric rotation disk of an eccentric rotation disk type vibrating motor and a coil for driving are stored in a cover of a watch outer case storing an electronic watch module. CONSTITUTION:A circuit board 18 is fixed to a back cover 4 by a motor fixing support 20 and a board fixing support 19 by screwing and a rotary weight shaft 7 on which an eccentric weight 10, a rotor magnet 11 and a rotor magnet seat 12 are fixed is rotated around rotary weight bearings 8 and 9 fixed to the back cover 4 and the board 18. When a watch movement 1 generates a rotation instruction signal, in other words, an electronic circuit chip 17 receives this instruction signal as an input and makes a driving current flow through a driving coil 15B, which gives a magnetic field generated in a coil core 14 to the circumference of the rotor magnet 11 through a yoke 13. The eccentric shaft weight 10 is rotated by this magnetic field, so as to generate vibration, and this vibration is transmitted to the back cover 4 and the board 18, so as to inform a user of a set time. According to this constitution, a watch with a sounding alarm can be remodeled into the one with a vibrating alarm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a vibration motor in an electronic timepiece.

[0002]

2. Description of the Related Art There are many commercially available electronic wrist watches with an alarm function that can be notified by sound at a set time. In this technique, a piezoelectric element is fixed to the inner surface of the back cover of the timepiece exterior, and the piezoelectric element drive circuit incorporated in the timepiece module drives the piezoelectric element to emit sound. Also, an electronic timepiece with a vibration alarm has been put on the market, in which a wristwatch starts slightly vibrating at a set time and the arm senses the vibration to know the time. This uses a vibration motor in which an eccentric rotating piece is attached to a rotary shaft of a conventional cylindrical DC motor, and the vibration motor and the timepiece module are two-dimensionally accommodated in a timepiece exterior for accommodating the timepiece module. That is.

[0003]

As described above, in the conventional electronic timepiece with the vibration alarm, the area of the vibration motor invades the flat area of the entire timepiece, which reduces the display area of the timepiece and the entire timepiece. It grows in a plane. Although a sounding alarm clock is structurally superior, it emits sound at the user's arbitrary time, which causes annoyance to the surroundings.

Therefore, it is an object of the present invention to avoid the above-mentioned drawbacks and to notify by vibration at the time set by the user without reducing the timepiece display area.

[0005]

In order to solve the above-mentioned drawbacks in the present invention, in an electronic timepiece having an eccentric rotating disk type vibration motor, the eccentricity is provided on a lid of a timepiece exterior case for accommodating the electronic timepiece module. The eccentric rotating disk of the rotating disk type vibration motor and the driving coil are housed.

[0006]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the cross-sectional structure of the electronic wrist watch of this embodiment. FIG. 2 is a plan view of the back cover seen from the arrow BB direction of the back cover portion shown in the sectional view of FIG.

In FIG. 1, reference numeral 1 is a timepiece movement. Reference numeral 2 is a watch exterior case for housing the watch movement 1. Reference numeral 3 is a windshield for showing the display screen of the clock movement 1. 4 is a clock movement 1
Is a case back for housing the watch exterior case 2. The case back 4 is screwed to the watch case 2. Reference numeral 5 denotes a move fixing ring for fixing the timepiece movement 1 when the timepiece movement 1 is housed in the timepiece outer case 2 and the back cover 4 is screwed. Reference numeral 6 is an O-ring for preventing the entry of water and dust between the move fixing ring 5 and the back cover 4.

Reference numeral 7 is a rotary weight shaft, and 8 and 9 are rotary weight bearings which serve as bearings for rotating the rotary weight shaft 7. Reference numeral 10 is a fan-shaped eccentric weight. Eccentric weight 10
Is fixed to the rotary weight shaft 7, and is rotated by the rotation of the rotary weight shaft 7 to a position of 10A indicated by a thin line. Reference numeral 11 is a cylindrical rotor magnet used in an ordinary electronic timepiece. 1
Reference numeral 2 denotes a rotor magnet seat for fixing the rotor magnet 11 to the rotary weight shaft 7.
Are bonded and fixed, and the rotor magnet seat 12 is fixed to the rotary weight shaft 7. Therefore, the eccentric weight 10 is attached to the rotary weight shaft 7.
The rotor magnet 11 and the rotor magnet seat 12 are fixed and rotate about the rotary weight bearings 8 and 9.

Reference numeral 13 is a yoke used in a normal timepiece. The yoke 13 forms two bodies and supplies a magnetic field around the rotor magnet 11. Reference numeral 14 indicates a coil winding core. The two yokes 13 and the coil winding core 14 are made of a high magnetic permeability material and guide the magnetic force around the rotor magnet 11. Reference numeral 15 is a coil wound around the coil winding core 14, and 15A is a rotor magnet 1
A detection coil for detecting the counter magnetomotive force due to the rotation of 1.
Reference numeral 15B is a drive coil for generating a magnetic force that gives a rotational force to the rotor magnet 11. 16A is a detection coil 15A
16B is a drive coil terminal plate for fixing the coil end of the drive coil 15B and connecting it to an electronic circuit. is there.

Reference numeral 17 is an electronic circuit chip for inputting the signal from the above-mentioned detection coil 15A and outputting the drive signal to the drive coil 15B. Reference numeral 18 is an electronic circuit chip 17 mounted and has the above-mentioned detection coil terminal plate 16A and drive coil terminal plate 1
6B is a circuit board for electrical connection with 6B. The aforementioned rotary weight bearing 9 is fixed to the circuit board 18, and the circuit board 18 serves as an intermediary member for inputting the rotation instruction signal and the power supply voltage from the timepiece movement 1 to the electronic circuit chip 17. The circuit board 18 is screw-fixed to a board-fixing column 19 which is planted in the back cover 4. 20 is the back cover 4 in the same manner
It is a motor fixed column planted in the
3, the coil winding core 14, and the detection coil terminal plate 16A or the drive coil terminal plate 16B are fixed by screws.

In the above structure, the circuit board 18 is screwed to the back cover 4 of the timepiece by the motor fixing column 20 and the substrate fixing column 19. An eccentric weight 10 centered on rotary weight bearings 8 and 9 fixed to the back cover 4 and the circuit board 18.
The rotary weight shaft 7 that fixes the rotor magnet 11 and the rotor magnet seat 12 rotates. As the eccentric weight 10 rotates, vibration is transmitted to the back cover 4 and the circuit board 18.

When the timepiece movement 1 generates a rotation instruction signal, the electronic circuit chip 17 inputs this rotation instruction signal via the circuit board 18. Therefore, the electronic circuit chip 1
7 outputs a predetermined drive signal to drive coil terminal plate 16B
A drive current is passed through the drive coil 15B via. A magnetic field is generated in the coil winding core 14 by the drive current. This magnetic field passes through the coil winding core 14 and the yoke 13 and is applied to the periphery of the rotor magnet 11. As a result, the rotary weight shaft 18 described above obtains a rotational force and rotates. As described above, the rotary weight shaft 18 that generates the vibration force for forming the vibration motor and the electronic circuit chip 17 that controls the rotation thereof are integrally housed in the back cover 4.

[0013]

By implementing the present invention as described above, the timepiece module 1 uses a conventional timepiece having an alarm function, and the back cover is a timepiece module having a back cover accommodating the vibration motor of this embodiment. By housing 1 in the watch exterior case 2, it is not necessary to newly install the structure of the conventional watch module 1, and the development cost can be reduced. Also in terms of electric circuits, the instruction signal for sounding the buzzer having the conventional alarm function can be used as it is as the rotation instruction signal. Further, it is clear that, even in the arrangement of the timepiece, it is very good in terms of vibration efficiency that the vibration motor, which is a source of vibration, is housed in the back cover 4 that is in contact with the arm that senses vibration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cross-sectional structure of an electronic wrist watch according to an embodiment.

FIG. 2 is a plan view of the back cover seen from the arrow BB direction of the back cover portion shown in the cross-sectional view of FIG.

[Explanation of symbols]

 1 Clock Module 4 Back Lid 7 Rotating Weight Shaft 10 Eccentric Weight 11 Rotor Magnet 13 Yoke 14 Coil Winding Core

Claims (4)

[Claims] 1. An electronic timepiece having an eccentric rotary disk type vibration motor, wherein an eccentric rotary disk and a drive coil of the eccentric rotary disk type vibration motor are mounted on a lid of a timepiece outer case that houses the electronic timepiece module. An electronic wristwatch characterized by containing a. 2. The electronic wristwatch according to claim 1, wherein a circuit board having a drive circuit for driving the eccentric rotary disk type vibration motor is housed in the lid of the timepiece exterior case. 3. An eccentric rotating disk type vibration motor has an eccentric rotating disk having one end which rotates around a receiving bush fixed to a lid of a watch case and the other end which rotates around a receiving bush fixed to the circuit board. The electronic wrist watch according to claim 2, wherein: 4. An electronic device according to claim 3, wherein an eccentric rotary disk type vibration motor is used in which a rotary plane of the eccentric rotary disk and a winding plane of the winding of the drive coil are orthogonal to each other. Watches.