JPH0245833Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electronic timepiece having a plurality of step motors.

[Prior art]

The conventional electronic clock of this type was developed in U.S. Pat. No. 57-37488.
As shown in the figure, the distance between the end-processed portions of the coil block is set larger than the distance between the other end portions that are not processed. Further, as in Japanese Patent Application No. 57-234447, the area of the polygon connecting the ends of the coil block is set larger than the area of the polygon connecting the other ends. Therefore, it is well known that the area of the circuit board increases and the cost of the circuit board increases in proportion to the area. On the other hand, multi-function watches that display the time and other information using multiple motors have many patterns for crystal oscillator, power supply, motor, switch, adjustment, and function check.
When MOS-ICs are placed near the outer periphery of a watch, many pattern wirings are extremely difficult, and the pattern width must be made finer. This caused various problems such as pattern breakage.

〔the purpose〕

In view of these conventional problems, the purpose of the present invention is to minimize the area of the circuit board incorporated in an electronic watch equipped with three or more step motors, and to reduce the size of each part. The purpose of the present invention is to enable connecting circuit pattern wiring to be arranged at a low density, thereby realizing a cost reduction of a watch and also realizing a highly reliable watch that does not have circuit pattern breakage or the like.

[Means to achieve the purpose]

In order to achieve the above object, the present invention provides an electronic timepiece having a circuit board mounted on a timepiece body, an IC chip mounted on the circuit board, at least three step motors, and a battery. The circuit board and the battery are arranged at the center of the watch body in an overlapping state in the cross-sectional direction of the watch body. Further, a coil lead board provided with a terminal processing section for connecting both terminals of the coil and the pattern of the circuit board is arranged at the end of the magnetic core of the coil block on the side closer to the center of the watch body. In addition, mounted on the circuit board
The IC chip is placed near the center of the watch body.

〔Example〕

Hereinafter, the present invention will be described in detail based on examples.

FIG. 1, FIG. 2 a, b, and c are plan and cross-sectional views showing one embodiment of the present invention. 1 is a rotor in which a permanent magnet 1a is insert-molded with synthetic resin and has a pincushion, upper and lower handles. A stator 2 is made of a ferromagnetic material and has a hole surrounding the rotor 1 (the notch is omitted). Reference numeral 3 designates a coil block that integrates a magnetic core having joints at both ends of the coil for magnetic coupling with the stator 2, a coil frame, and a coil lead board on which the ends of the coil and coil wire are processed.
Here, the portion of the coil block having the coil lead board 3c will be referred to as an end portion A3a, and the other end will be referred to as an end portion B3b. Further, the rotor 1, stator 2, and coil block 3 are usually called an hour/minute motor for displaying time. The rotation of the rotor 1 consists of the fifth wheel & pinion 4, the fourth wheel & pinion 5, the third wheel & pinion 6, the second wheel & pinion 7 (holding the minute hand 81 for the normal time), the minute wheel 8, and the hour wheel 9 (holding the minute hand 81 for the normal time). (which holds the hour hand 80). 10
is a small second hand wheel that meshes with the fifth wheel 4, and a small second hand 82 that displays the seconds of the normal time. 11, 21, 31 are rotors, 12, 22, 32 are stators, 13, 2
3 and 33 are coil blocks, which are common to the above-mentioned hour and minute motors, and each have a 1/10 block for displaying the measured time of a stop watch (hereinafter abbreviated as SW).
They are called the second SW motor, minute SW motor, and hour SW motor. The rotation of the rotor 11 is 1/10 through the intermediate wheel 14.
Drive the 1/10 second SW wheel 15 holding the second SW hand 90,
Its reduction ratio is set to 1:150. Rotor 2
1 rotation drives the minute SW wheel 25 which holds the minute SW hand 91 via the intermediate wheel 24. The rotation of the rotor 31 drives the time switch wheel 35 via the intermediate wheel 34 while holding the hour switch hand 92. When measuring time, each SW second displays 1/10 second and each digit of seconds, minutes, and hours. Reference numeral 40 indicates an intermediate wheel meshing with the hour wheel 8, 41 a small iron wheel, and 43 a gear wheel loosely fitting into the winding stem 42. The clutch wheel 43 is positioned in multiple stages by a pusher 44 and a bolt 45 that are linked to the pushing and pulling operations of the winding stem 42. When the winding stem 42 is pushed further from its normal position, it also serves as a reset button for the stopwatch. Reference numeral 46 denotes a regulating lever, which regulates the fifth wheel and pinion 4 when the needles are aligned. Reference numerals 50 and 51 designate switch levers that engage with a start/stop button and a split button, respectively, and when the buttons are pressed, contact lead plates A52 and B53 to form switches that are input. The reset lead plate 54 and the reset lead plate 55 of the stopwatch, together with the dowel of the stopwatch 44, each constitute a switch. 58 is a battery which is a power source. 56 and 57 are a battery positive terminal and a battery negative terminal, respectively.
One end of each lead plate is brought into contact with the pattern of the circuit board 61 on which the MOS-IC 60 is mounted to establish electrical continuity. 59 is a crystal resonator.

Next, Figure 4 shows each motor, circuit board and
The arrangement of ICs is shown. The arrangement of the coil blocks constituting each motor will be described with reference to this figure as well. Since each coil block is arranged so that the end A having the coil lead board is located closer to the center of the watch, the area of the circuit board 61 becomes extremely small. For example, as shown in the figure, polygon a is drawn by connecting the coil terminal processing parts of each coil block. The area of the rectangle b (connecting the axis of the set screw) formed by this polygon a and the end B is a<b
Therefore, the area of the circuit board 61 becomes extremely small. In this explanation, the coil terminals are processed using a coil lead board, but the coil 64
The same applies to the case where the terminal is directly soldered to the circuit board 65 (as shown in FIG. 3).

Next, the arrangement of MOS-IC60 will be described. M.O.S.
- The planar position of the IC60 is located approximately in the center of the clock, and in cross section it is located between the center wheel & pinion 7 and the 1/10 second SW wheel 15. Furthermore, a part of MOS-IC60 is polygon a
It is located inside. Therefore, each pattern of the motor, switch, battery 58, crystal oscillator 59, etc.
-Can be routed uniformly from each side of IC60.
Therefore, since the pattern density can be reduced, the degree of freedom in turning the pattern can be increased, and the pattern width can also be increased. Therefore, pattern strength increases and reliability improves. Also, when a watch is configured with two motors, for example, an hour/minute motor and a minute motor (this combination does not work as a watch specification, so the two motor specifications are changed as appropriate).
Similar effects can be obtained even if part of the MOS-IC 60 is placed within the rectangle e formed by the terminal processing portions of the coil blocks 3 and 23. Another advantage is that even if the number of patterns increases like in a multi-function watch, sufficient wiring can be achieved. Since the MOS-IC 60 is housed in the train wheel part by the train wheel bridge 63, it is not exposed to outside light while the watch body is in place, and the IC has a structure with excellent light resistance.

Next, we will discuss the arrangement of the block that displays the digits at SW (the cross section is the same as the block that displays the minute digits, so the drawing is omitted). A portion of the coil block 33, stator 32, and rotor 31 that constitute the hour switch motor are arranged closer to the center of the watch body than the hour switch wheel 35. This allows the area of the circuit board 65 to be reduced. In addition, in a clock that requires a certain size, such as a stopwatch, it is possible to create an excellent design by increasing the distance from the center of the clock to the axis of the hour switch wheel 35, which is the secondary hand.

[Effect of idea]

As explained above, the present invention provides an electronic watch equipped with three or more step motors.
The battery and circuit board are stacked in the center of the watch body, thereby securing space around the watch body.In this area, the coil blocks that make up each step motor are arranged, and the coil blocks are arranged in this area. A terminal processing portion for connecting the block side and the circuit board side is formed at the end of the coil block on the side closer to the center of the watch body. In addition to this, an IC chip is also placed near the center of the watch body.

In this way, in the present invention, the circuit board is placed at the center of the watch body, and the IC chip is mounted on the circuit board near the center of the watch body.
Since the closer ends of the coil blocks placed on the outer periphery of these coil blocks are connected to the circuit board side, the area of the required circuit board can be reduced, and this board and the coil The circuit connection pattern between blocks etc. can be shortened. Furthermore, since the circuit connection pattern can be shortened in this way, it is no longer necessary to route the pattern for a long time as in the past, and the pattern shape is simplified, which frees up space for installing the circuit connection pattern and eliminates the possibility of wire breakage. It becomes possible to arrange a wide pattern without fear of Furthermore, since the circuit connection pattern can be shortened and simplified in this way, the noise resistance characteristics can also be improved.

In summary, according to the present invention, the area of the circuit board can be reduced, so that the cost of the watch can be reduced. Further, since the circuit connection pattern can be easily routed and the pattern width can be increased, pattern breakage does not occur, and the reliability of the watch can be improved.

[Brief explanation of the drawing]

1 and 2 are plan and sectional views showing one embodiment of the present invention. FIG. 3 is a sectional view showing another embodiment of the present invention.
FIG. 4 is an explanatory diagram showing the arrangement relationship of each motor, circuit board, and IC in the embodiment shown in FIGS. 1 and 2. FIG. 1, 11, 21, 31...rotor, 2, 12,
22, 32... Stator, 3, 13, 23, 33
...Coil block, 3a, 13a, 23a, 3
3a...Coil lead board, 34...Intermediate wheel, 3
5...Time SW car, 60...MOS-IC, 65...
circuit board.

Claims (1)

[Claims for Utility Model Registration] A circuit board mounted on a watch body and having a pattern to which an IC chip is fixed, the IC chip mounted on this circuit board, at least three step motors, and a battery. Each of the step motors includes a coil block including a coil and a magnetic core excited by a signal from the circuit board, a stator magnetically coupled to both ends of the magnetic core, and a permanent magnet including a permanent magnet. a rotor that rotates within the coil block; the circuit board and the battery are arranged in an overlapping state in a cross-sectional direction of the watch body at a central position of the watch body; and the magnetic core of the coil block A coil lead board equipped with a terminal processing section for connecting both terminals of the coil and the pattern of the circuit board is disposed at an end near the center of the watch body, and the coil lead board is mounted on the circuit board. The IC chip was
An electronic watch characterized by being placed near the center of the watch body.