JPH021786Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conversion structure for a push switch used in a stop watch or the like.

In stop watches and the like, a push button is generally arranged on the peripheral side of the watch, and the push button is pressed to operate the watch.

On the other hand, the circuit board that forms the main structure of a watch is generally placed parallel to the display surface of the watch.
This is inevitable in a digital format. In view of these requirements, it is necessary to consider a mechanism that receives the operation of a push button that operates parallel to the circuit board and converts it into an electrical signal on the circuit board. In the past, there were many methods that involved transferring a button to the side of the circuit board, or soldering a U-shaped metal lead from the plane of the circuit board to the side, so that it would impact when the push button was pressed. . These have had problems with manufacturing costs, contact reliability, and even impact when dropped.

The present invention is based on a simple mechanism that converts the operation of the push button from the surrounding area into electrical operation on the circuit board, and as an element that makes this possible, the rubber switch is required to form a moderation of operation that feels like a snap, which is essential for a stopwatch. There is. This will be explained using drawings. FIG. 1 is a plan view of the stopwatch according to the present invention with the back cover removed, FIG. 2 is a sectional view of the main part of FIG. 1, and FIG. 3 is a developed view of the main part. 1
2 is a front frame, 2 is a circuit board, 3 is a liquid crystal cell, and 4 is transparent glass, and the circuit board 2 is arranged parallel to the display surface of the stopwatch. Reference numeral 5 denotes a support plate which is fixed to the front frame 1 with the circuit board 2 sandwiched therebetween.
6 is a rubber switch which is connected to the circuit board 1 by the support plate 5.
supported above. 7 is a conversion lever, and the shaft 8 at the end is inserted into a U-shaped bearing 9 provided on the support plate 5 from the side. Numeral 10 is a push button which is fitted into and supported by the pillars 11 of the front frame 1. The push button 10 performs a rotational movement as indicated by an arrow 14 in response to a push operation indicated by an arrow 13. Reference numeral 12 denotes a return spring which constantly exerts a force in the direction opposite to the arrow 18 to release the push button 10.
is further away from the conversion lever 7. A gap 15 is created as a spacing. The gap 15 is the shaft 8 of the conversion lever 7
Since this is smaller than the range supported by the U-shaped bearing 9 of the support plate 5, the conversion lever 7 will not come off. When the push button 10 is operated as indicated by the arrow 13, the push button 10 first turns in the direction of the arrow 14 against the force of the return spring 12, and the end 16 of the push button 10 is connected to the short side point 17 as an engagement portion of the conversion lever 7.
corresponds to When the push is continued, the end portion 16 attempts to turn the conversion lever 7 in the direction of the arrow 18 against the elasticity of the rubber switch 6. 19 is rubber switch 6
This is the end face as the tip of the conversion lever 7 that pushes the top 22 of the converter lever 7. 20 is a conductive rubber, 21 is a pattern, and the stopwatch circuit is controlled by contact between 20 and 21. Figure 4 is a moderation diagram, with stroke on the horizontal axis and pushing force on the vertical axis. 23 indicates the moderation of rubber switch 6, and even though there is a difference in size, the peak weight will be about 150g. With the ratio of l ₂ /l ₁ ≒5 in Figure 2, the moderation is expanded as shown in 24 and the peak is raised to around 750g. The ratio can range from 1.5 to 10, both l ₁
< l ₂ , which allows the stopwatch to be made thin. At about 750g, you will be able to get the proper feel of the stopwatch's click, and you will also be able to prevent malfunctions. The gist of the present invention is that the operating mode is determined only by the mechanical mode of the rubber switch 6, which eliminates the need for conventional metal click plates or articulation between metal members, which improves service life and prevents falls. It is impact resistant and helps simplify the structure. Reference numeral 25 indicates a return force line of the return spring 12, and 26 indicates a moderation in which the lever moderation 24 and the return force 25 are combined. The return spring 12 serves both the purpose of adding a return force to the return of the rubber switch 6 to ensure a reliable return, and the purpose of forming the preparation operation described below. Composite moderation 26 is break point 27
It supports a gentle return force equivalent to 400g when pressing the gap 15 mentioned above. When the stroke reaches the turning point 27, the conversion lever 7
As the rubber switch 6 begins to be pressed, the load increases rapidly, and you can feel the response at the breaking point. This gap 15 corresponds to the preparation operation,
To provide an error-free stopwatch operation in two steps, such as tapping when ready and snapping when measuring. It should be noted that the push button 10 may be of a linear type instead of a rotary type and can be implemented within the scope of the present invention. Returning to FIGS. 1 and 3, the explanation will be continued. 28 is a positive electrode plate, 29 is a negative electrode plate, 3
0 is a screw. The screws 30 pass through the front frame 1, the circuit board 2, the negative electrode plate 29, the support plate 5, and the positive electrode plate 28 in this order and are tightened. The pole portion 31 of the positive electrode plate 28 elastically contacts the positive pattern 32 and the surface portion 33 of the negative electrode plate 29 contacts the negative pattern 34 to supply power. Positive electrode plate 2
8 and the negative electrode plate 29 are insulated by a support plate 6 made of resin. The positive electrode plate 28 and the negative electrode plate 29 can be arranged one on top of the other, thereby saving area. 3
5 is a supporting bank for the button battery. 36 is a string,
37 is a knot, and 38 is a bank built into the front frame 1. The large-diameter knot 37 fits into a room 39 formed by the bank, etc., and when the back cover (not shown) is fitted, the knot 37 is closed. Supported without any slack. As is clear from the above, since the pushing force from the side is converted into a switch in the right angle direction to the circuit board via the conversion lever, a thin structure is possible, and the l ₁ of the conversion lever: Since the _l2 lever ratio was set at 1:1.5 to 10, it was possible to obtain a suitable operating feel (click feeling) and to prevent malfunctions, resulting in great effects.

[Brief explanation of the drawing]

Figure 1 is a plan view of the stopwatch according to the present invention with the back cover removed, Figure 2 is a sectional view of the main parts of Figure 1, Figure 3 is an exploded view of the main parts, and Figure 4 is the moderation of the present invention. It is a diagram. 6...Rubber switch, 7...Conversion lever, 10
...Push button, 2...Circuit board.

Claims (1)

[Scope of utility model registration request] In the structure of a switch such as a stop watch that is operated by pushing from the side, there is a push button as an external operating member for pushing from the side, and a conversion lever for converting the pushing force of the push button into rotational motion. , a rubber switch that has a moderation function and is pressed and operated by the conversion lever, and the conversion lever has a rotating shaft that is the center of rotational movement, an engaging portion that engages with the push button, and the rubber switch. When the length from the rotating shaft to the engaging part is l ₁ and the length from the engaging part to the tip is l ₂ , l ₂ ≧1.5 l ₁ A structure of a switch such as a stopwatch, which is characterized by the following settings.