JPS5941550Y2 - transparent keyboard switch - Google Patents

Description

[Detailed description of the invention] This invention is a transparent keyboard switch that uses the displacement of an elastic transparent sheet to open and close contacts. A conductive paste with high conductivity is applied onto the electrode that comes into contact with the part.

FIG. 1 is a diagram showing a conventional transparent keyboard switch.

In this figure, 1 is a transparent insulating sheet (e.g., polyester film) that is displaced by stress, and 2 is a very thin film (e.g., metal oxide such as indium oxide) provided on this insulating sheet A1. A movable electrode group made of a transparent conductive film, 3 is a movable contact that is a part of the movable electrode group 2, 4 is a pattern A that is a part of the movable electrode group 2 other than the movable contact 3, and 5 is the transparent sheet 1 An insulating sheet spacer 6 is in contact with the surface on which the movable electrode group 2 is provided and has a hole penetrating through the portion corresponding to the movable contact 3; 6 is an insulating sheet B in contact with the other surface of the spacer 5; 7; is provided on this insulating sheet B6, and the spacer 5
A fixed electrode group 8 is made of a very thin transparent conductive film such as a metal oxide and is provided in contact with the movable electrode group 2 through the hole, and 8 is a fixed electrode group 7 corresponding to the movable contact 3.
The upper part of the fixed contact 9 is pattern B, which is the part other than the fixed contact 8.

In the above configuration, when the insulating sheet A1 is pushed downward by stress applied from the outside, the transparent movable contact 3 fixed thereto also moves downward.

Therefore, the distance between the movable contact 3 and the fixed contact 8 is reduced,
Eventually, the movable contact 3 and the fixed contact 8 come into contact, turning on the circuit.

Furthermore, when the external stress applied to the insulating sheet A1 decreases, the displacement of the insulating sheet A1 begins to return to its original state, so that the insulating sheet A1 is finally turned off.

The transparent conductive film used for the contact pattern part of such conventional transparent keyboard switches has a high resistance value, and the film thickness is very thin, ranging from several hundred to several thousand amps, so the conductivity is low. It has low wear resistance and low wear resistance compared to general conductive materials.

In addition, in order to accommodate as many keys as possible in such a switch, each key is formed in a matrix, and the resistance between the terminals varies greatly depending on the length of the circuit, and this value itself is also large and difficult to handle in micro voltage circuits. The drawback was that it could not be used.

In addition, if the transparent conductive film is scratched during handling or when opening and closing the switch, poor contact is likely to occur.

This idea reduces the resistance between the terminals between the keys by applying a conductive paste with high conductivity to the peripheral edge of the transparent conductive film with low conductivity and on the transparent conductive film that contacts the frame of the spacer. In addition to reducing the value, the variation in this value was also reduced.

In addition, even if a part of the transparent conductive film breaks, its four sides are surrounded by highly conductive paste, so contact failure is unlikely to occur and reliable switching occurs, just like a conventional transparent keyboard switch. The object of the present invention is to obtain a transparent keyboard switch that can be turned on and off by a slight displacement of a transparent insulating sheet, without reducing light transmittance.

FIG. 2 shows an embodiment of this invention. In the figure, reference numerals 1 to 9 are the same as those of the conventional transparent keyboard switch described above.

A movable paste 10 is provided on a portion of the movable electrode group 2, and is made of a conductive paste with high conductivity.

Note that this conductive paste has a thickness or width that does not significantly affect the transmission of light.

Similarly to 10 above, reference numeral 11 is a fixed paste made of a highly conductive paste provided on the fixed electrode group 7.

In the transparent keyboard switch configured in this way, the movable contact 3 is displaced by external stress as in the conventional transparent keyboard switch, the movable contact 3 and the fixed contact 8 come into contact, and the signal is transmitted to the movable side with high conductivity. It is transmitted to the paste, the contacts with low conductivity, and the fixed paste with high conductivity, forming a stable switch with low circuit resistance.

Moreover, since the transparent conductive film is surrounded by conductive paste on all sides, poor contact is unlikely to occur, and the light transmittance of this transparent keyboard switch is not much different from that of conventional transparent keyboard switches, so there is no problem with transmittance at all. It's something that doesn't exist.

As mentioned above, this idea turns on and off due to changes in external stress.
In the transparent keyboard switch that is turned off, a conductive paste with high conductivity is used as the current collection pattern, so it has the same light transmittance as the conventional one, low circuit resistance, stable, and transparent conductivity. It is possible to obtain a transparent keyboard switch in which poor contact is less likely to occur even if the membrane is scratched.

Therefore, compared to conventional transparent keyboards, it has the advantage that it can be operated with a circuit with a lower power supply voltage and that contact reliability can be improved.

[Brief explanation of the drawing]

Figure 1 shows a conventional transparent keyboard switch.
c, e are plan views of each component, b, d. f is a new view of each component, g is a sectional view of the entire switch, and FIG. 2 is a diagram showing an embodiment of this invention. c, e are plan views of each component, b, d, f
g is a sectional view of each component, and g is a sectional view of the entire switch. In the figure, 1 is an insulating sheet) A, 2 is a movable electrode group, 3 is a movable contact, 4 is a pattern A, 5 is a spacer with a hole, 6 is an insulating sheet B, 7 is a fixed electrode group, 8 is a fixed 9 is a pattern B, 10 is a movable paste, and 11 is a fixed paste. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A movable power source made of a transparent conductive material provided on a transparent insulating sheet that is easily displaced in response to external stress, and one surface of which is in close contact with the surface of the transparent sheet on the movable electrode side;
and a spacer made of an insulating sheet with a hole penetrating in a portion corresponding to the movable electrode, and a transparent insulating sheet provided in a direction intersecting the movable electrode on the transparent insulating sheet that is in close contact with the other surface of the spacer. In a transparent keyboard switch whose basic component is a fixed electrode made of conductive material,
A transparent keyboard switch characterized in that a conductive paste is applied around both electrode groups made of transparent conductive films and on the transparent conductive films of both electrode groups that are in contact with the periphery of a hole provided in a spacer. .