JPS60247188A - Electronic wristwatch - Google Patents

Abstract

PURPOSE:To enable the reduction in the thickness of a wristwatch and to attain to reduce the cost of a circuit block by hoop production, by supporting a thin flexible circuit board by an elastic metal plate. CONSTITUTION:The structure of a circuit part is formed of a flexible circuit board 25, an elastic metal plate 21 having a size and shape capable of covering the greater part of said circuit board 25 and a substrate 1. The board 25 forms a configuration interposed between the substrate 1 and the metal plate 21. A contact part by a conductive pattern is provided to the substrate 25 and contacted with the part to be contacted provided to other watch parts under pressure by pressing force due to the elasticity of the metal plate 21 to take continuity. Further, the metal plate 21 holds at least a part of electronic parts by pressing force due to the elasticity thereof. By this mechanism, a connection structure becomes simple and a space also becomes small and large effect is imparted to the thickness reduction, miniaturization and cost reduction of the watch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a circuit section used in an electronic wristwatch.

[Conventional technology and problems]

Conventionally, the structure of the circuit section used in electronic wristwatches has been constructed by mounting necessary electronic components on a circuit board made of ceramic, glass-epoxy resin, etc., and connecting them by means of a circuit board.

However, the above-mentioned circuit boards are no longer able to satisfy the growing need for thinner products.

Flexible Norint substrates have recently appeared in response to this thinning, and good results have been obtained, but flexible Norint substrates alone lack rigidity, so they have problems with ease of installation and retention after installation. .

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a circuit structure suitable for a thin watch.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a plan view of the crystal oscillation wristwatch according to the present invention, viewed from the back cover side. The upper right corner of the figure is the rieus (not shown).

) and a needle alignment mechanism are mainly arranged. The central part of the winding stem 7 is loosely fitted into a horizontal hole in the main plate 1, and a mandarin duck 8 is provided so as to straddle the winding stem 7. The cannula 9, which is screwed to the mandarin duck 8 and has a lever 9b, swings a switching lever 10 around a switching stud 10a planted in the base plate 1. Kotetsu car 11
and the intermediary wheel 12 that meshes with it are placed on the switching lever 10. A backing work 13 that clamps the mandarin duck 8 and a part of the switching lever 10 between the base plate 1 determines the proximity of the one 8a planted in the mandarin duck 8 by its spring force in the vertical direction. the two holes 13m, and the bent portion 1 that presses the battery 38 in the lateral direction to establish continuity and stabilize the position of the battery 38.
3b, and is fixed to the base plate 1 with two screws.

The former is a small and thin mechanism that generates moderating force for the drawer and push-in operations of the winding stem 7, and the latter is a small and thin mechanism that generates moderation force for the drawer and push-in operations of the winding stem 7.
The thickness of the plate is just right, and the cost is reduced because it can be used as a component.

Effective in terms of space. The mandarin duck 8 has an elongated hole 8b in a direction perpendicular to the axial direction of the winding stem 7 that is loosely fitted into the shaft 1c planted in the main plate 1. There is little gap at the joint, in the longitudinal direction of Mandarin Duck 8,
That is, this is because it is necessary to provide play in the direction perpendicular to the axial direction of the winding stem 7. Therefore, even in a thin wristwatch such as the present embodiment, a highly reliable switching mechanism with sufficient engagement between the winding stem 7 and the mandrel 8 can be obtained. Furthermore, the mandarin duck 8 has a welded (+) spring 8c, which is electrically connected to the (→ lead part 25m) of the flexible sheet 25, and is attached to the contact point 26 implanted in the main plate with IK isolation, in the direction of its upper and lower surfaces. 1d is a hole into which the character assumption is loosely fitted, 35b is a dial screw that presses and fixes the character assumption, and 37 is a mechanical screw that secures the clock movement to the watch case (not shown). There is another one at a symmetrical position.The winding stem 7゜Mandarin 8. Cannula 9. Switching lever 1o
, a switching mechanism mainly consisting of a back pusher 13, a winding stem 7. The needle turning mechanism, which mainly consists of the small iron car ti, the intermediate car 12, and the switch mechanism, which mainly consists of the spring 8c and the contact 26, will require a lot of adjustment if a failure occurs, but all of these Since they are located on the back cover side and are exposed so that their relationship to each other can be seen at a glance, the corresponding work is facilitated.

An electromechanical converter serving as a prime mover is placed in the upper left portion of FIG. 1. The coil 19, which fits into a slightly larger hole provided in the main plate 1, is attached to the dial side of the main plate 1 with screws at both ends of the winding core 191. In addition to being held by fixing with , it is held by a coil holder 29 made of front rear acetal resin or the like in the center and silicone rubber 31 inserted into the gap between the base plate 1 and the coil 19. The structure of the upper left portion prevents deformation of the soft magnetic winding core 19a that occurs upon impact. 30 is a magnetic shield plate and coil holder 2
9 is fixed with a pin 29a, and these integrated parts are attached to the main plate 1 with screws 29b. 17a is a notch in the stator 17 that determines the initial position of the rotor 6, and the rotor 6 is not placed in a symmetrical position suddenly. Although not shown, it is shaped to have the same effect. Reference numeral 18 denotes a stator plate, which is made of brass and has approximately the same shape as the stator 1'7. Reference numeral 2o designates a terminal plate made of a glint plate attached to a protruding portion of the coil winding core 19a that is apart from the magnetic circuit.

The center part of Figure 1 shows the deceleration wheel train and the instruction wheel train.
In this embodiment, all of them are located in the lower surface of the main plate 1, that is, in the milling part on the dial side. A rotor 6 of the prime mover is rotated by a stator 17 which receives an alternating magnetic flux excited by a coil 19. Fourth wheel and pinion, which is a reduction gear train 5. Third wheel 4. The second wheel & pinion 3 decelerates the rotation of the rotor 6.Rotor 6, fourth wheel & pinion 5. The shaft support in the upper surface direction of the third wheel 4 is a bushing made of polyacecool resin that is pressed and fixed to the main plate 1, and may not be lubricated, but a very small amount of lubricant will give better results in terms of rust. Fourth wheel 5. The shaft support in the lower surface direction of the third wheel & pinion 4 is a bush similar to that described above, which is embedded in the train wheel bridge 2 screwed to the lower surface side of the main plate 1. The center wheel 3 is loosely fitted onto a central shaft 1a planted in the main plate 1. The indicator wheel train 15 and hour wheel 16 receive rotation from the deceleration wheel train. The hino-ura wheel 15 is located between the main plate 1 and the hino-ura support 14 fixed to the main plate 1, and is also rotated by the intermediary wheel 12 of the needle turning mechanism when setting the hands. Rotor 6 on main plate 1
The hole 1h located at the overlapped position is for operation confirmation. The reduction gear train is almost invisible from the back cover side.

The bottom side of Figure 1 is the electronic circuit section, and the right side is the battery section.

The circuit base 21 on which the electronic circuit components are mounted is made of nickel silver material and has a thin flexible conductive sheet 25 having conductive patterns attached to the lower surface thereof. The circuit base 21 is placed on the milling part 1j of the base plate 1, and the upper surface of the base plate 1 is at the same height as the upper surface thereof, and is arranged substantially in a plane with the reduction gear train. 22 is a crystal resonator, 23 is an IC chinograph, 24 is a temperature compensation capacitor, and 28 is a trimmer capacitor. The end face of the crystal resonator 22 is pressed and held by the spring force of the bent portion 21e provided on the circuit base 21 and the bridge 21f. Temperature compensation capacitor 24
is similarly held by the spring force of the bent portion 21i.

The trimmer capacitor 28 is fixed to the stepped portion 21h of the circuit base 21, where that portion of the conductive sheet 25 can also be bent, and can be adjusted from the top side by removing the back cover.

Reference numeral 21g denotes a coil connection portion in which the conductive sheet 25 also has the same shape, and presses the coil terminal plate 20 with spring force. 25
a is a + lead portion extending to the contact point 26 of the sheet 25, 25C
is a cable in which a conductive turn that does not fit within the plane of the circuit base 21 of the conductive sheet 25 is provided along the side surface of the crystal resonator 22. 27 is a spring for the battery 38,
It is fixed by caulking the studs 27m to the circuit base 21. 21e is a mark engraved on the circuit board 21. Taking advantage of the fact that the circuit board 21 is made of nickel silver, its surface is mirror-finished and has beautiful lines.
Since the surface of the main plate 1 is flat and wide as described above, if the surface of the main plate 1 is finished in the same manner, the movement state can be made to have an extremely high-class feel. The circuit base 21 is fixed to the base plate 1 with screws 21a and the like. Countersinking of screws 21a, etc., the above-mentioned mark engraving, surface finishing, strength as a base, spring function due to bending and flat shape, and installation by drawing and bending, which can be freely designed at the height of the part. The effect of using metal as the material for the circuit board 21 is significant in terms of step formation, component bonding strength, etc., including electrostatic shielding, reinforcement of thin parts of the base plate 1, gear train bridge 2, Japanese-Soviet rear wheel bridge 14, etc. You can also consider using it in combination with

The milling part 1j of the main plate 1 in which the circuit board 21 is accommodated is
Thick parts is, If, and Ig are left on the outer periphery of the main plate to match the recesses of the circuit board 21. These parts abut against the inner periphery of the case, and the position of the movement is aligned with other parts. Has the ability to decide. One 1g thick part has a mechanical screw,
Dial screws are provided.

FIG. 2 is a sectional view taken along line A-A in FIG.

The winding stem 7 is loosely fitted into a horizontal hole in the main plate 1, and a stepped portion 7b formed at the cut-up portion of the tooth splitter of the tooth portion 7a at the tip engages with the mandrel 8. This makes it possible to make a thin wristwatch by reducing the diameter of the winding stem 7, and it also makes it possible to make a small wristwatch by shortening the length of the winding stem 7. 7C is a beveled part at the tip of the winding stem 7, which allows the mandrel 8 to be pushed up when the winding stem 7 is installed. Although a large external force is applied to the winding stem 7 from the rieus (not shown), the tip including the tapered step 7b that engages with the mandarin duck 8 is not loosely fitted into the main plate 1, etc.
There is no danger of the stepped portion 7b breaking, and the winding stem 7 can be designed to have a smaller diameter in the same way as described above. The crown gear part of the small iron wheel 11 meshes with the tooth part 7a of the winding stem 7, and since the mandarin pin 8 and the cannula 9 are integrated, they continue to mesh even when the winding stem 7 is pulled out or pushed in, and is switched. Prevents crushing of the teeth, which tends to occur during operation. The small iron car 11 is rotatably switched between the seat 11a and the stud 11b so as to provide an appropriate axial clearance.
-10, and the intermediate vehicle 12 is similarly attached to the switching lever 10 with studs 12a. The switching lever 10 is a stud 10a.
It is held on the main plate 1. The portion 11b' of the stud 11b of the small iron car 11 that protrudes beyond the switching lever 10 is provided with a reverse slope to prevent it from slipping out from the hook 9b of the cannula 9. Therefore, the pivot 9 can correct the tilt in the upper surface direction (back cover direction) of the switching lever 10, and prevent the teeth 7a of the winding stem 7 and the small iron wheel 11 from coming out of engagement. From the right end of FIG. 2, a rotor 6 has a magnet 6a inserted in a hole in a stator 17 and a pinion 6C that fixes it via a nylon resin seat 6b.
and the fourth wheel of the reduction gear train 5. Third wheel 4. The center wheel 3 is shown. The shaft support in the lower surface direction (dial direction) of the rotor 6 is
This is a polyacetal resin bushing 18b embedded in the stator plate 18. IhFi rotor 6 operation confirmation hole,
2 is a train wheel bridge located close to the dial 35. The center shaft 1a is installed perpendicularly to the plane of the main plate 1 with high precision so that the tilting of the center wheel 3 and the hour wheel 16, that is, the deflection of the hour hand 332 and the minute hand 34, is minimized. 3IL is a washer that softens the friction between the hour wheel 16 and the center wheel 3, and 32 is a dial washer. The Japanese-Soviet rear wheel 15 is regulated downwardly by three protrusions 14a provided on the Japanese-Soviet supporter 14 in three directions approximately equally spaced from its center of rotation.

39 is the back cover, 36 is the windshield. When the winding stem 7 is pulled out and rotated, the rotation is transmitted to the rotor 6, and a needle setting operation is performed.

FIG. 3 is a sectional view taken along line B-H in FIG.

A stator plate 18 that determines the planar position of the stator 17 including the stator 17 by means of pins 1b planted in the main plate 1
A shaft portion 18a, which is integrated with an extruded portion 17b and has a threaded end, is pushed into a hole in the stator 17. Both bent ends of the winding core 19a of the coil 19 are tightly coupled to the stator 17 by countersunk screws 19e on the shaft portion 18a. 19d is a winding frame. A sectional view perpendicular to the axial direction of the coil 19 shows the outer protective sheath 19b of the coil winding and its coupling surface 19b', and shows the silicon dem 31. Also shown are the coil holder 29, the shield plate 30, and their setscrews 29b. The right end in FIG. 3 is the terminal connection part of the coil 19, and the terminal plate 2 is attached to the unbent protrusion 19a' of the coil winding core 19m, which is joined to the main plate IK.
0 through the flexible conductive sheet 25 by the respective members m21g of the circuit base 21. The coil protection sheet 19b is a more stable and thinner protection means than a heat-shrinkable coating or an adhesive coating.

FIG. 4 is a sectional view taken along line CC in FIG. 1.

Pull-out portion 2 of the conductive sheet 25 that has passed through the lower surface side of the battery 38
5& is connected to a contact 26 fixed to the ground plate 1 via an insulating bushing 26a with a node 26b. Mandarin duck axis I
The contact spring 8C, which is point-welded to the mandarin duck 8 located between the back pusher 13 and the main plate 1 with C as the center of rotation, is normally connected to the contact 2.
It is in contact with 6.

35 is a dial plate, 35g is a character assumption, and 35b is a dial screw.

FIG. 5 is a sectional view taken along line D-D in FIG. 1.

A cannula 9 for swinging the small iron car 11 and the like is fastened to the mandarin duck 8 with screws 9a. Step part 7 of winding stem 7 of mandarin duck 8
The portion 8d that engages with the winding stem 8d is cut into a semicircular shape, which eliminates the incomplete engagement between the winding stem 7 and the mandrel 8 as described above. With this structure, by pulling out and pushing in the winding stem 7,
The mandarin duck 8 has the disadvantage that displacement noise is generated in the direction perpendicular to the axis of the winding stem 7, but as mentioned above, the hole 8 that loosely fits into the mandarin shaft IC
The problem is solved by making b an ellipse. 1 is a hole into which a jig is inserted to push up the winder 98 and release it from the winding stem 7. The bottle 8a planted in the mandarin duck 8 slides on the edges of the two holes 13a of the back pusher 13, and the winding stem 7 is pulled out.
Performs click operation during push operation. 13b is battery 3
13d is a set screw of the back press 13. 38a is placed on the caulked part of the lid of the battery 38,
It is a conductive rubber cushion that absorbs machining errors at the caulking part, and its cross section is located in a nearly triangular space with no extra gap between the milling part of the main plate 1, so it has a strong repulsive force against excessive compression. This has the effect of minimizing the movement of the battery 38 toward the dial 35, which occurs when the wristwatch is dropped. Conducting with the cathode part of the battery 38, the battery 38
The spring 27 that presses the
The underside is coated with insulation, and the circuit board 21 has studs 27.
It is fixed at a. 27b is solder which further increases this fixation and provides conduction, and 25a is a drawn-out portion of the conductive sheet 25 extending to the contact point 26.

FIG. 6 is a sectional view taken along line E-E in FIG.

The circuit base 21 has a shape that matches the outer peripheral side surface of the battery 38, and is fixed to the base plate 1 by screws 21j inserted into 921b located near the base plate 21 to assist in positioning the battery 38. The temperature compensation capacitor 24 is connected to the circuit board 21.
Conductivity is established at the folded portion 25b of the conductive sheet 25 supported by the two folded portions 21i.
? There is a resin adhesive 24a. The temperature compensation capacitor 24 made of barium titanate material changes its temperature characteristics even when heated with solder, but this structure does not have this problem, and it is possible to solder long lead material to the capacitor body in advance as in the conventional case. There is a significant difference in the amount of effort and space required when mounting the capacitor on the board, compared to soldering the ends of the lead material without applying heat to the capacitor body. In the center of FIG. 6, a bent conductive sheet cable portion 25a passing outside the crystal resonator 22 is shown, and its conductive glossy turns are coated with an insulating coating. A circuit base 21 is fixed to the main plate 1 with screws 21 nearby.
A trimmer capacitor 28 is attached to the stepped portion 21h that has been processed with zero aperture.
is fixed with solder 28h. Trimmer board 2
8d and a trimaro 28c made of a dielectric material are integrated in such a way as to generate an appropriate sliding torque between the upper and lower springs 28e, 28f, the shaft 28m, and the stud 28b. The upper spring 28e connects the trimmer rotor 28c and the solder 28.
g, and the trimmer rotor 28e is fixed from the direction of the back cover 39.
can be rotated together. The lower spring 28f is the base plate 1
The capacitor comes into contact with the milling part of the capacitor, and receives the force directed toward the bottom surface generated during the capacitor adjustment process described above. The position of the stepped portion 21h of the circuit base 21 can be set according to the standard trip yy"y that is desired to be commonly used in various watches.

FIG. 7 is a sectional view taken along line FF in FIG.

The crystal oscillator 22, which is attached to the bending part 21e of the circuit base 21 and the bending part of the bridge part 21f while absorbing the length error, is attached with a glass 22 at the end of a cylinder 22b made of copal material.
22h has a structure in which the sealed lead plate 22f and the pin 22e fixed to the crystal resonator piece 22a with solder 22g are pressed together in the hole 22d' of the ceramic block 22d. It is a vacuum sealing stopper made of metal, and it is also possible to change the structure to a structure in which a concave portion is provided and the structure is firmly fixed to the bent portion 21e. The lead plate 22f of the crystal resonator 22 is connected to the conductive sheet 25 with solder 22i. The right side of FIG. 7 shows an IC chip f23 mounted using the fritsunochirano method.

23a is an epoxy resin coating.

〔Effect of the invention〕

As described above, according to the present invention, even if a flexible circuit board is assembled into a watch by itself, it has no strength and will undulate, but by supporting this with a metal plate, a thin flexible circuit board can be used, and a watch can be fitted with a thin flexible circuit board. It becomes possible to reduce the thickness of the circuit board, and it also becomes possible to reduce the cost of the circuit block through the production of fugues, which is possible with a thin circuit board.

Furthermore, when connecting circuit boards and electronic components including the ground plate, it is extremely difficult to separate the parts that are joined by soldering, and the soldering process itself is difficult when connecting the ground plate or crystal resonator tube. It becomes difficult. On the other hand, even when connecting with screws, there are disadvantages such as increased space and cost, but since the present application has a structure in which conductivity is achieved by the elasticity of the elastic metal plate, the connection structure is It is simple and requires a small space, and has a great effect on making watches thinner, smaller, and cheaper.

In addition, by using the elastic force of the elastic metal plate to hold other parts on the elastic metal plate, a separate holding member for holding the parts can be omitted, and the elastic metal plate and flexible circuit board can be If it is fixed, the elastic metal plate can hold large electronic parts such as crystal oscillators, and the circuit board can be connected for continuity, such as by soldering, making it convenient to disassemble and reassemble the watch. It can have many effects, such as:

[Brief explanation of the drawing]

FIG. 1 is a plan view of a crystal oscillation wristwatch according to an embodiment of the present invention, and FIGS. 2 to 7 are A-A and B of FIG. 1, respectively.
-B, C-C, D-D, E-E. A cross-sectional view along FF. l...Main plate 3...Second wheel 4...Third wheel 5...Fourth wheel 6...Rotor 21...Circuit base 35...Dial plate 39...Back cover patent Applicant Citizen Watch Co., Ltd. Agent Patent Attorney Kojibe Kawai Toshihiko Kanayama

Claims (2)

[Claims] (1) Consisting of a flexisol circuit board, an elastic metal plate having a size and shape that can cover most of the flexible circuit board, and a base plate, the flexible circuit board is between the base plate and the elastic metal plate. The flexible circuit board is provided with a conductive contact portion, and the contact portion provided on another watch component is pressed by the elasticity of the elastic metal plate. An electronic wristwatch characterized in that it is configured to be brought into contact with each other by pressure to establish continuity. (2) Consisting of a flexible circuit board, an elastic metal plate having a size and shape that can cover most of the flexible circuit board, and a base plate, the flexible circuit board being between the base plate and the elastic metal plate. 1. An electronic wristwatch characterized in that the elastic metal plate is formed with an elastic holding portion that holds at least a part of the electronic component by the pressing force of the elastic metal plate.