JPS6224896Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is mounted on a character display surface used in various information processing devices, for example, on the display surface of various display devices, and is used to display a specific display position and therefore a specific character. Regarding improvements to transparent switches used for extraction.

This type of transparent switch is a transparent switch that is placed vertically and horizontally on two transparent substrates (glass or synthetic resin plates) with transparent spacers between them, respectively, to match the vertical and horizontal display pitch of the display symbol on the display surface. It is composed of vapor-deposited matrix electrodes, and by pressing a specific display position with a finger, the intersection of the matrix electrodes corresponding to that position is directly conductively or electrostatically connected, and the display is connected via the end terminals. and transmits its output to the subsequent position sensing circuit.

Fig. 1 shows the main parts of this type of transparent switch in a top view (a) and a side cross-sectional view (b). 1 is a transparent glass or epoxy resin plate, and the display is made of, for example, tin oxide,
Alternatively, a transparent electrode strip 2 made of indium oxide or the like is vertically vapor-deposited, and a similarly transparent epoxy resin film 3 is provided thereon as a spacer, avoiding the electrode strip 2. A transparent and flexible surface electrode substrate 5 on which transparent electrode strips 4 are deposited is placed and integrated into a matrix electrode configuration.

The arrangement pitch of each of the matrix electrodes 2 and 4 is equal to the arrangement pitch of the character 6 (indicated by a chain line) of the display board on which the transparent switch is mounted,
Therefore, the center of each character coincides with the intersection position of the electrodes 2 and 4.

If the crossing position is pressed with the fingertip 7, electrical contact will be made at the corresponding crossing position of the electrodes 2 and 4, and the specific A and B terminals will be in a conductive state. When the fingertip 7 is released, the flexible transparent substrate 5 on the surface returns to its original state due to its own restoring force.
Electrical contact is released.

It is clear from the figure that depending on the crossing position, terminals A and B
The electrical circuit lengths, that is, the path lengths between the two are different, and naturally the path resistance values are also different. However, since the transparent electrodes 2 and 4 that form the electric circuit length are made of a vapor-deposited film of tin oxide or indium oxide several microns thick to improve transparency, their specific resistance is also quite large, and the path resistance value depends on the intersection position. The difference will affect the subsequent crossover position detection circuit.

For this reason, measures have been taken such as inserting a correction resistor in the subsequent detection circuit to compensate for the low pass resistance portion of the transparent switch.

However, as the number of matrix electrodes 2 and 4 increases and the number of selected characters 6 increases, the number of circuits with different path resistance values also increases, and the difference in path resistance values can reach several tens of times. This also complicates the resistance correction means within the detection circuit.

In order to prevent this drawback, the present invention first attempts to equalize the path resistance values within the transparent switch.

This objective is achieved by providing differently shaped notches at the base of upper and lower transparent matrix electrodes arranged vertically and horizontally on a transparent insulating substrate, thereby partially increasing the resistance value, thereby forming a structure that forms a substantially uniform path resistance regardless of the selected crossover position.

Although the matrix electrode pattern is more complicated than in the past, the vapor deposition process using a mask remains unchanged, and it is only necessary to create a mask with a predetermined shape. Figure 2 shows an example of the matrix transparent electrode pattern used in the present invention, with vertical electrodes B ₀ , B ₁ , B ₂ . . .
The crossing positions of the horizontal electrodes A ₀ , A ₁ , A ₂ . . . are provided on the selected character 6. A notch 8 is provided at an appropriate position in each electrode, and a narrow portion 9 with a height h and a length is provided in the electrode path to increase the resistance value of the path. The degree of this is, in the case of a deposited electrode with a uniform thickness,
It is directly proportional to the length and inversely proportional to the height h. Therefore, by sequentially decreasing the length and increasing the height h of the electrodes A ₀ , A ₁ , A ₂ ..., B ₀ , B ₁ , B ₂ ...
Between A ₀ and B ₀ , between A ₁ and B ₁ , between A ₀ and B ₁ , between A ₁ and B ₀ ...
The respective path resistance values can be made substantially equal.

Therefore, even if the number of characters increases, there is no need to increase the number of shapes of the narrow portion 9 so much.

As explained above, according to the present invention, in a transparent switch having upper and lower transparent matrix electrodes arranged vertically and horizontally on a transparent insulating substrate including insulating spacers, the path resistance at each crossing position of the upper and lower matrix electrodes can be made uniform. Therefore, there is no need to provide a special correction means in the subsequent position detection circuit, and its practical effects, together with its economical value, are significant.

[Brief explanation of the drawing]

FIG. 1 shows an example of a general transparent switch in top view A and side sectional view B, and FIG. 2 shows an example of a matrix pattern used in the transparent switch according to the present invention. In the figure, 1 and 5 are transparent substrates, 2 and 4 are matrix electrodes deposited on the substrates, 3 is a spacer, 6 is a selective character, 8 is a notch, and 9 is a narrow portion on the matrix electrode.

Claims (1)

[Scope of utility model registration request] In a transparent switch for extracting a display position placed on a display surface, a notch is inserted into the base of each of the upper and lower transparent matrix electrodes, which are arranged vertically and horizontally on a transparent insulating substrate, including insulating spacers. 1. A transparent switch characterized in that a high resistance portion is provided to equalize the path resistance at each intersection position of the upper and lower matrix electrodes.