JPH0215838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movement structure of a small hand display type electronic wristwatch equipped with a step motor as an electromechanical converter.

The recent proliferation of high-precision quartz watches has led to rapid progress in making watch movements thinner and smaller in pursuit of aesthetic design. Among these, analog quartz watches have great requirements in terms of external design, and in particular for products such as women's bracelet watches, where the size of the watch movement has a large effect on the external design, ultra-compact and thin analog watches are required. There was an urgent need to create a movement for a crystal wristwatch.

The biggest factor hindering miniaturization and thinning is that analog quartz wristwatches are powered by batteries, which must be replaced when the battery life reaches its end. In other words, the miniaturization of watches
As batteries become smaller and thinner, their lifespans will inevitably become shorter.
Even in that case, if the battery life beyond a certain level (for example, one year or more) is not guaranteed, the product will not be viable. FIG. 1 is a plan view schematically showing the arrangement of main elements in a conventional analog quartz watch used as a women's bracelet watch. The watch board 1 includes each element that makes up the watch movement, namely a battery 2, an electronic circuit block 3, a step motor 4,
The wheel train mechanism 5, display correction mechanism 6, etc. are accommodated in a substantially planarly shifted and dispersed arrangement state, except for some overlap. Regarding the step motor 4, the coil 4a and the stator 4b are arranged planarly shifted from each other.

By the way, there would be no problem if ultra-miniaturization and thinning of the timepiece movement as intended by the present invention could be achieved by reducing the size of all elements as is, but the above-mentioned hindrance factors arise.
In other words, as batteries become smaller, the battery capacity decreases significantly, and the current consumption of the step motor increases significantly. Therefore, in order to guarantee a certain battery life, the rate of reduction in the size of the battery and step motor must be The size of the watch movement must be made smaller than that of other elements, and in the end, sufficient ultra-compactness and thinness cannot be achieved with the conventional arrangement structure of each element. .

An object of the present invention is to provide the most effective movement structure for an analog timepiece for achieving ultra-miniaturization, and to provide an optimal arrangement structure for battery lead plates in an ultra-miniaturized analog timepiece.

Therefore, the present invention has the following configuration. That is, a watch base plate such as a main plate constituting a watch movement, a gear train mechanism disposed approximately at the center of the watch base plate, and two or three sides of the periphery of the gear train mechanism are formed in a substantially L-shape or an electronic circuit block disposed on the outer periphery of the watch board so as to surround it in a U-shape; batteries stacked on top of the electronic circuit block and most of the gear train mechanism; In an area adjacent to the battery and the gear train mechanism, a coil of a step motor is stacked on the stator and rotor, and an anode lead plate and a cathode lead configured to contact the anode and cathode of the battery, respectively. a plate, a motor fastening member for fixing the coupling parts provided at both ends of the coil to the watch board, a conductive pattern connecting the ends of the winding part of the coil, and the anode lead plate or the cathode lead plate. A conductive pattern is provided for connecting one of the coils, and a power supply connection member is provided for guiding each of the coils to the electronic circuit block, and a part of the power supply connection member is provided on the coupling portion of one of the coils. is disposed with the conductive pattern for connecting one of the anode or cathode lead plate facing upward, one of the anode or cathode lead plate is disposed on the conductive pattern, and the motor fastening member and fixing one of the anode or cathode lead plates, the power supply connecting member, and the coupling portion of one of the coils, and further fixing the coupling portion of the anode or cathode lead plate on the other of the coils. Place the other directly,
The motor fastening member is characterized in that the other of the anode or cathode lead plates and the coupling portion of the other coil are fixed.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic plan view for modeling and illustrating the movement structure of an analog quartz wristwatch according to an embodiment of the present invention, and FIG. 3 is a detailed plan view thereof. 4 to 6 are sectional views of essential parts of FIG. 3 above. In this example, the base plate 10, which is a watch board, has a shape similar to a rectangle or an ellipse, and has a major axis A direction and a minor axis B direction. Further, a timepiece movement constructed using the base plate 10 as a substrate also has a shape similar to a rectangle or an ellipse, and has a major axis A and a minor axis B.

Approximately at the center of the main plate 10, a gear train mechanism 11 is provided.
An electronic circuit block 12 is arranged on the outer periphery of the main plate 10 so as to surround two sides of the wheel train mechanism 11 in a substantially L-shape.
Further, a display time adjustment member 13 is disposed near the outer periphery of the main plate 10 along the major axis A direction so as to surround the gear train mechanism 11 in a substantially U-shape together with the electronic circuit block 12. There is. Furthermore, a battery block 14 made of batteries 33 and the like having a diameter D is stacked and arranged on top of these so as to cover most of the gear train mechanism 11, electronic circuit block 12, and display time adjustment member 13. A step motor 15 is disposed on the outer periphery of the main plate 10 in the remaining direction surrounding the wheel train mechanism 11. Note that the electronic circuit block 12 includes an IC chip 121 and a crystal resonator 122.
etc. have been implemented.

The battery block 14 includes a battery 33 which is formed by welding an anode lead plate 31 and a cathode lead plate 32 to an anode and a cathode, respectively, and a battery support member 34 made of synthetic resin that positions the battery 33 in the diametrical direction. , and a battery insulating sheet 35. The battery support member 34 has two protrusions 34a and 34b downward.
One is engaged with the outer peripheral notch 10c of the base plate 10, and the other is engaged with the notch 16f of the train wheel bridge 16 for positioning. The anode lead plate 31 has an insulating plate 31a adhered to the top surface of the tip (in this embodiment, the base plate 1
This is because 0 is the pole). The cathode lead plate 32 is formed so as to cover almost the entire surface of the battery 33 in a plan view, and has various marks engraved on the top surface, and is bent upward to make contact with the watch case so as to use the watch case as a pole. It also has a spring protrusion 32a. Step motor 15 has coil 3
6, a stator 37, a rotor 38, and a battery connection member 39, and the coil 36 is stacked on the stator 37, which accommodates the rotor 38 inside, in a substantially planar manner. The rotor 38 has a permanent magnet piece 38a, and the support plate 3 is integrated with the stator 37 by welding.
The upper and lower shafts are supported by the upper and lower shafts 7a and the main plate 10, and the rotation is transmitted to the fourth wheel & pinion 17 that meshes with the upper and lower shafts. Magnetic coupling between the coil 36 and the stator 37 is achieved through at least one (three in the figure) spacers 36b and 36c each made of a magnetically permeable material and integrated into the coil core 36a at two locations. The power supply connection member 39 has two arms 39b and 39c, and the middle part 39a connects the winding part 36 of the coil 36.
It is adhesively fixed to the outer periphery of the lower surface of d. The two ends of the winding portion 36d of the coil 36 are processed to establish electrical continuity with the conductive pattern of the power supply connection member 39, which also serves as a terminal processing plate.
The arm 39b having a conductive pattern on its upper surface connects the coil 36 and the battery 33 within the gap between the connecting portion 34 of the battery support member 34 which is also connected within this gap.
The coil winding portion 36d is guided from the lower surface of the outer periphery of the coil winding portion 36d to the upper surface of one of the fastening portions 36e of the coil magnetic core 36a and is bonded thereto. other arm 3
9c is guided to a screw tube 10a planted in the base plate 10, which positions the switch spring 29 and the circuit board 24 in an overlapping manner. At this time, each pattern (two terminals of the coil winding portion 36d,
The three conductive cathode patterns of the battery 33 are pressed together and electrically connected by the method described below. The arm 39c has a hole 39d that engages with the switch spring rivet 30, which prevents rotation when the screw 40 is fastened. 2 planted on the base plate 10
The screw tubes 10d and 10e are connected to a connecting portion 36e at both ends of the stator 37 and the coil core 36a,
36f are positioned one on top of the other, and are pressed together by a pair of screws 41 and 42, which are members for fastening the step motor to the main plate 10, to effect magnetic coupling. At this time, the anode lead plate 31 is also screwed to the screw tube 10d, and the cathode lead plate 32 is screwed to the screw tube 10e with screws 41 and 42, respectively, so that they are insulated from the screw 41 by the insulating plate 31a. The anode lead plate 31 is pressed against the pattern of the battery connection member 39 to establish electrical continuity, and the cathode lead plate 32 is connected to the coil core 3.
The ground plate 10 is also polarized at the same time by being pressed against the ground plate 6a. The battery support member 34 has two L-shaped notches 34d and 34e arranged so that the gaps between them are very small with respect to parts of the fastening parts 36e and 36f at both ends of the coil magnetic core 36a, respectively.

In ultra-compact and thin watches, where the planar size of the watch board is determined by the adjacent batteries and coils, the above-mentioned structure around the battery makes it easy to (1) position the battery, and (2) position the battery. Electrical continuity between the anode and the circuit board (in this example, the ground plane), (3) Electrical continuity between the cathode of the battery and the ground plane, (4) Regulation of horizontal movement of the battery toward the coil in response to external shocks. (The other direction can be regulated by the exterior), etc., can be effectively done in a very small amount of space. With the present invention, the size of the watch movement can be dramatically reduced, making it possible to create full-scale ultra-small women's bracelet watches, as well as ultra-small wristwatches and other ultra-small watches that require an ultra-small movement. A small analog crystal clock can be easily provided.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main element arrangement structure of a conventional women's analog crystal watch, FIG. 2 is a plan view of the arrangement structure of an analog crystal watch according to an embodiment of the present invention, and FIG. 3 is a specific plan view. 4 to 6 are sectional views of main parts of FIG. 3. DESCRIPTION OF SYMBOLS 10... Base plate, 24... Circuit board, 31... Anode lead plate, 32... Cathode lead plate, 33... Battery, 34... Battery support member, 36... Coil, 3
6a... Coil magnetic core, 36d... Winding part, 36
e, 36f... Fastening portion, 39... Power supply connection member, 40, 41, 42... Screw.

Claims (1)

[Scope of Claims] 1. A watch base plate such as a base plate constituting a watch movement, a gear train mechanism disposed approximately at the center of the watch base plate, two or three sides of the periphery of the gear train mechanism, An electronic circuit block is arranged on the outer periphery of the watch board so as to surround it in a substantially L-shape or a U-shape, and is stacked on top of the electronic circuit block so as to cover most of the electronic circuit block and the gear train mechanism. a battery arranged therein, a coil of a step motor stacked on a stator and a rotor in an area adjacent to the battery and the gear train mechanism, an anode configured to contact the anode and cathode of the battery, respectively; A lead plate and a cathode lead plate, a motor fastening member for fixing the coupling portions provided at both ends of the coil to the watch board, a conductive pattern connecting the ends of the winding portions of the coil, and the anode lead plate. or a conductive pattern for connecting one of the cathode lead plates, and a power supply connection member for guiding each of the conductive patterns to the electronic circuit block; A part of the member is disposed with the conductive pattern for connecting one of the anode or cathode lead plate facing upward, and one of the anode or cathode lead plate is disposed on the conductive pattern, The motor fastening member fixes one of the anode or cathode lead plate, the power supply connection member, and the coupling portion of one of the coils, and further, the anode is fixed on the coupling portion of the other coil. Or directly arrange the other side of the cathode lead plate,
A movement structure for a small pointer display type electronic wristwatch, characterized in that the motor fastening member fixes the other of the anode or cathode lead plates and the coupling portion of the other coil.