JPS6344788Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch structure for a digital electronic watch.

Conventionally, this type of switch structure was developed in 1983.
143633 (Jitsugan 56-31968) is known. In this switch structure, in an electronic watch that uses a circuit board with a wiring electrode pattern formed on only one side, a fixing plate with an integrally formed switch spring is placed on the other side of the circuit board, and the switch spring part is connected to the circuit. The feature is that the switch circuit is turned on and off by hooking it to the wiring electrode pattern side of the board and sliding it in the plane direction while pressing the circuit board. With this structure, the fixed board can be attached to the circuit board. To prevent the switch springs from hitting the circuit board when stacking them, consideration must be given to letting them escape to the side.Moreover, letting them go to the side has disadvantages such as bending and changing the switch stroke, and is also difficult to assemble. Automatic assembly machines were simply not suitable for mass production.

The present invention has been developed in view of the above-mentioned drawbacks, and its purpose is to eliminate the above-mentioned conventional drawbacks and provide an inexpensive assembly structure, which will be described in detail below with reference to the drawings.

Reference numeral 1 denotes a so-called circuit board on which a MOS-IC chip 2, a boost capacitor chip 3, a crystal resonator 4, etc. are mounted, and as shown on one side, an appropriate number of electrodes facing the electrodes of a liquid crystal panel described later are provided above. It is being Reference numeral 5 denotes a liquid crystal panel, and on one side thereof, an equal number of electrodes are provided so as to face the aforementioned circuit board 1. The lower polarizing plate 5A of this liquid crystal panel 5 is a generally known type with a reflecting plate, and is of a type that does not require a reflecting plate below the lower polarizing plate. A connector 6 electrically connects the electrodes of the liquid crystal panel 5 and the circuit board 1, and the connector and the liquid crystal panel are housed in a panel frame 7 made of plastic material. From the panel frame 7, there are dowels 7A for positioning,
7A are formed as protrusions, and the dowels 7A penetrate through holes 1A of the circuit board 1 and protrude to serve for fixation by heat caulking, which will be described later. 7B is a screw hole provided in the panel frame 7, and this positioning dowel 7
The same number of screw holes 1B as A, 7A, etc. are provided in the immediate vicinity of the dowels in a slightly smaller number, and the circuit board 1 is also provided with opposing screw holes 1B. Furthermore, the panel frame 7 is provided with a display window 7C for the liquid crystal panel 5, a storage recess 7D for the liquid crystal display panel 5, and a surface 7E around the recess on which a switch spring 8 and a circuit board 1, which will be described later, are sequentially placed. ing. The switch spring 8 is clamped and fixed to the panel frame 7 and the circuit board 1 using the aforementioned dowels 7A, and is used to supply power to the electronic components 2, 3, and 4 of the circuit board 1 from a power source such as a silver battery 9. battery fixing part 8 that comes into contact with the positive electrode case of the battery;
A, a conductive contact portion 8B that contacts the positive electrode pattern 1C of the circuit board, and switch input arm portions 8C, 8C.
have. This switch input arm 8C, 8C
is the switch input pattern section 1 of the circuit board 1 described above.
It has a predetermined stroke l relative to the switch input arms 8C and 1D, and presses against the circuit board with spring force, and is connected to the switch input arm parts 8C and 8C. It is designed to accept switch input from buttons. Reference numeral 10 denotes a battery negative terminal, which establishes conduction from the negative electrode of the silver battery 9 to the negative electrode pattern of the circuit board 1. Also, the switch spring 8 is connected to the tab 7A of the panel frame 7.
It has a hole 8E that engages with the panel frame 7 and becomes a positioning part, and a flat part 8F that is pressed and held between the surface 7E of the panel frame 7 and the surface of the circuit board 1.

For a watch with this structure, first insert the liquid crystal panel 5 into the panel frame 7, then insert the connector 6, fit the switch spring 8 into the dowel 7A, and then connect the battery negative terminal 10. Then, the circuit boards 1 are placed one on top of the other, and heat caulking is performed. This thermal caulking involves melting and crushing the tips of the dowels 7A, 7A, 7A with a hot chisel to create a larger diameter portion 7' than the hole 1A of the circuit board 1 and fixing the panel frame 7, as described above. LCD panel 5, connector 6, circuit board 1, switch spring 8,
The battery negative terminal 10 is integrated.
At this time, the switch spring 8 is laminated on the pattern of the circuit board 1, but since an insulating layer 1' such as a solder resist is provided directly under the switch spring 8 to increase the insulation of the circuit board 1, the short It does not cause such problems. The conductive contact portion 8B of the switch spring 8 contacts the positive electrode pattern 1C with a desired spring pressure to supply power to the electronic components 2, 3, and 4, and the conductive contact portion 8B contacts the electrode of the liquid crystal panel 5, especially in the illustration. Since it is close to the back surface of the opposite side (lower side), even if the lower side of the liquid crystal panel 5 falls down and tilts due to a shock when the user is carrying it, it will not touch this conductive contact part 8B and prevent further damage. Since it prevents tilting, the appearance does not deteriorate significantly, and there is no need for dummy rubber for tilt prevention, which was additionally used in the past, and tilt prevention can be achieved at low cost.

In addition, if some of the parts, such as the liquid crystal panel 5 or the circuit board 1, break down due to long-term use by the user, the large diameter part 7' of the heat crimping can be cut off with a cutter knife, etc., and the product can be disassembled and replaced with a new one. Simply replace it, insert the screw 11 into the screw hole 7B immediately adjacent to this dowel, and complete the assembly. By doing this, after-sales service can be performed easily, and the dealer does not need to keep a large number of expensive finished movements in stock, but only needs to have the required number of each part, and the user can purchase the product at a low price. All you have to do is cover the repair costs.

This integrally assembled electronic timepiece movement displays a common and well-known timekeeping function on the liquid crystal panel 5 by inserting a silver battery 9. If the user wants to see the "month/day" or "seconds" display in addition to the so-called "time display," he/she can press a side button provided on the exterior. For example, by pressing the upper right side button, the switch spring 8
The side button receiving portion 8D receives this and slides the switch input arm portion 8C on the circuit board 1.

There is a switch input pattern section 1D at the tip of the switch input arm section 8C, and switch input is achieved by the switch input arm section 8 riding on this pattern, and the "month/day" display format changes to "seconds" display. It changes. When the user releases his/her finger from the side button, the switch input arm 8C returns to its original position due to the spring force, maintaining the predetermined switch stroke 1 and taking the next input opportunity. By making the switch input pattern part 1D into a fan shape with the center on the switch input arm part 8C side, the switch stroke due to mutual positional variations between the tip of the switch input arm part 8C and the switch input pattern part 1D during processing and assembly can be reduced. There is less variation.
For example, in FIG. 6, if 1E is the variation range of the tip of the switch input arm 8C with respect to the switch input pattern section, then the tip of the switch input arm 8C is 8
If it is near C', the tip of the switch input arm 8C will come into contact with the input pattern part near 1E and an input will be made, but if the switch input pattern shape is 1D',
There is a difference of l' in the switch stroke near 1E between the case of 1D which is the present invention, and the switch stroke of the 1D' shape is longer by l'. Although not shown, if the switch stroke becomes long, a situation may occur in which the side button receiving portion 8D of the switch spring contacts the panel frame first and no input is made. It should be noted that the lower right switch input arm 8C is used for "time adjustment", and switch input can be achieved by the same operation as described above.

As described above, the present invention provides electrical connections between a circuit board on which electronic components such as MOSIC chips are mounted, a switch spring laminated on the circuit board, and electrodes of the circuit board and the electrodes of a liquid crystal panel placed on the switch spring. The switch spring includes a connector for connecting the liquid crystal panel to a predetermined position on the circuit board, and a panel frame for arranging the liquid crystal panel at a predetermined position on the circuit board. A switch input arm having a stroke and contacting the circuit board with a predetermined pressing force, and a side button receiving part for sliding the switch input arm in a plane direction and electrically contacting the switch input pattern part. In addition, the switch spring is clamped and fixed between the panel frame and the circuit board, so there is no need to move the switch input arm sideways and hook it to the circuit board during assembly. There is no need to worry about them breaking, and since these parts can be simply stacked on top of each other, automatic assembly is possible and mass production is possible. Furthermore, since the electronic components and switch input pattern on the circuit board are both placed on the surface of the panel frame, the circuit board can be a single-sided wiring board, which simplifies assembly and reduces costs. This is a significant contribution.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the digital electronic watch, Fig. 2 is a view taken in the P direction of Fig. 1, particularly showing the area around the side button receiver of the switch spring, and Fig. 3 is a view of the same part in the Q direction. , FIG. 4 is a cross-sectional view including the conducting contact portion, FIG. 5 is an enlarged cross-sectional view including the screw after after-sales service, and FIG. 6 is a detailed view of the switch input pattern portion. 1... Circuit board, 1D... Switch input pattern section, 2... MOSIC chip, 5... Liquid crystal panel,
6... Connector, 7... Panel frame, 7A... Dowel, 7C... Display window, 7D... Recess, 7E...
Surface, 8... Switch spring, 8C... Switch input arm portion, 8D... Side button receiving portion, 8E... Hole portion, 8F... Flat plate portion.

Claims (1)

[Claims for Utility Model Registration] A panel frame 7 having a recess 7D for housing the liquid crystal panel 5 on one surface and a display window 7C for the liquid crystal panel on the other surface, and a recess in the panel frame. a circuit board 1 having an IC 2, other electronic components 3, 4, and a switch input pattern section 1D arranged on a surface facing the circuit board; The switch input arm 8C is slidably arranged in pressure contact, the positioning part 8E is positioned by engaging with the plurality of protrusions 7A protruding from the panel frame, and the switch input arm 8C is pressed by the surface of the panel frame and the surface of the circuit board. A flat plate part 8F to be held,
a switch spring 8 comprising a side button receiving part 8D for sliding the switch input arm part and switching with the switch input pattern part; and a switch spring 8 disposed between the circuit board and the liquid crystal panel, respectively. The liquid crystal panel and the connector are sequentially housed in a recess of the panel frame, and the switch spring and the circuit board are sequentially mounted on a surface 7E of the panel frame around the recess. 1. A liquid crystal electronic timepiece, characterized in that the liquid crystal panel, the connector, and the switch spring are pressed and fixed by fixing the panel frame and the circuit board.