JPS5812153Y2 - electronic watch switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a time display switch in an electronic wristwatch that displays the time by bringing a part of the human body into contact with the case, particularly the glass.

In order to reduce the power consumption of electronic wristwatches, some electronic wristwatches display a time display only when the wearer of the electronic wristwatch touches a part of his or her body to the glass of the wristwatch.

Conventionally, buttons were made by covering glass with a transparent electrode, electrically connecting this transparent electrode to a display drive electrode inside the case, and bringing a part of the human body into contact with the transparent electrode.

By the way, the transparent electrode is generally called a Nesa film, which is a thin film of In2O3 or 5n02, and its thickness is 0.03 μm=o.
The thickness is about 1 μm, and if it is larger than 0.1 μm, the transparency deteriorates and interference colors appear, rendering the use of the Nesa film meaningless.

As mentioned above, the Nesa film on the other hand is adhered to the glass so as to extend continuously from the surface of the glass through the side surfaces to the back surface in order to electrically connect it to the internal electrodes for driving the display section. .

By the way, the side surface of the glass is like ground glass and has minute irregularities, and a thin NESA film of 0.1 μm or less is formed on this surface, resulting in poor electrical conductivity of the NESA film.

As mentioned above, increasing the thickness of the NESA film reduces its transparency and makes it meaningless, and vacuum deposition is difficult to achieve a thick coating, so a special method, cold sputtering, must be used. In addition to being technically difficult to increase the thickness, cracks are likely to occur and adhesion is poor.

Furthermore, the film has poor electrical conductivity, with a thickness of 0.1 μm and 1000 or more per katakari.

For this reason, the time display sometimes did not appear even if a part of the human body touched the Nesa membrane on the case.

From this point of view, this invention is easy to manufacture and works reliably by attaching a metal film to the slope of the glass without using Nesa film as an electrode for contacting a part of the human body. The present invention provides an electronic wristwatch switch.

Hereinafter, embodiments of the electronic wristwatch switch according to this invention will be described with reference to the drawings.

As shown in the figure, a back cover 12 is detachably attached to the back of the ring-shaped center 11 of the case, and an insulating backing 1 is attached to the front.
A glass edge 14 is fixed via 3.

A glass 15 is attached to the front side of the glass edge 14, and a decorative edge 16 is attached to the outer periphery of the glass 150 to the glass edge 14.

A glass backing 17 is interposed between the outer peripheral surface of the glass 15 and the glass edge 14.

A movement 18 to which an oscillator, a semiconductor integrated circuit, a time display section, etc. are attached is housed within the case.

A pair of internal electrodes 21° 22 for driving the time display section
are provided in the movement 18, these electrodes 21, 22
When connected to each other, the time display drive circuit is driven and the time display appears.

The internal electrode 21 is electrically connected to the front side of the case, and the internal electrode 22 is electrically connected to the center 11 on the back side of the case.

According to this invention, a metal film is applied as a contact electrode 23 extending from the back side of the glass 15 through the side surface to the sloped portion 15a.

The internal electrode 21 is electrically connected to this contact electrode 23 .

For example, a conductive rubber 24 is inserted into a hole in the movement 18 in contact with an electrode 21, and the protruding end of the conductive rubber 24 is made to elastically contact a contact electrode 23 attached to the back of the glass. .

An insulating film 25 is interposed between the contact electrode 23 and the glass edge 14 and decorative edge 16 to electrically connect them.

C7 is suitable for the contact electrode 23 in terms of adhesion to the glass 15, corrosion resistance, etc., but other metals such as A (1tAgtCujNi) may also be used.

The contact electrode 23 is disposed on the glass slope portion 15a, but in order to prevent a part of the human body from accidentally touching the contact electrode 23 when the time is not to be displayed, this is to prevent so-called malfunction. As shown in FIG. 2, when the wristwatch is attached to the left arm, the button is only pressed in the direction of the fingertips of that arm, that is, in the direction of 3 o'clock on a rotating hand type watch.

Further, on the back side of the glass 15, a contact electrode 23 can be applied to the entire surface except for the time display window 26, and the contact electrode 23 can be used to hide the inside of the case.

Alternatively, as shown in FIG. 3, the contact electrode 23 may be formed so as to linearly connect the contact portion with the conductive rubber 24 and the 3 o'clock direction of the glass slope portion.

According to the configuration described above, when a person carrying this wristwatch touches a part of his/her body to the contact electrode 23 on the glass slope, the electrodes 2L22 are electrically connected to each other through the human body, and the display drive section is driven. The time display will appear.

Since a metal film is used as the contact electrode 23, it is easy to make the film thickness about 0.1 to 0.2 μm.
Coupled with the high conductivity of the contact electrode 23, the electrical resistance between the slope portion of the contact electrode 23 and the conductive rubber 24 is low, ensuring reliable time display operation when a part of the human body is brought into contact with the contact electrode 23. It will be held in

In addition, the only part of the contact electrode 23 exposed to the outside is near the 3 o'clock display position in the analog display of the clock display part of the glass slope part 15a, that is, only the position of the display part in the direction of the fingertip of the arm on which the watch is worn. Compared to the case where the contact electrode 23 extends to the side, so-called malfunctions are less likely to occur, and since the contact electrode 23 is opaque, this limitation results in a better design.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of an electronic wristwatch switch according to this invention, FIG. 2 is a plan view of the glass, and FIG. 3 is a plan view showing another example of the glass. 11... Center, 14... Glass L 15... Glass, 15a... Slope portion, 16... Decorative edge, 2L22
...Internal electrode, 23...Contact electrode.

Claims (1)

[Scope of utility model registration request] The case of an electronic wristwatch has an insulated structure on the front side and the back side, and one of a pair of internal electrodes for driving the display section disposed inside the case is electrically connected to the back side of the case. and the other is connected to a contact electrode on the front side of the case, and when a wearer of the electronic wristwatch contacts a part of the human body with the contact electrode, the pair of internal electrodes are connected to each other through the human body. When the electronic wristwatch is configured such that the display section emits light to display the time, the contact electrode passes from the back side of the glass attached to the front side of the case, and passes through the side surface of the glass. A metal film is formed on the sloped surface of the glass and extends toward the fingertip of the arm on which the electronic wristwatch is worn in the display section, and the inner electrode is attached to the back surface of the metal film. An electronic watch switch with one end electrically connected.