JPS6226892Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital switch that includes a conductor sliding piece that selectively contacts a plurality of conductor paths and obtains a digital code signal according to the position of the sliding piece.

FIG. 1 shows a conventional switch of this type, in which 1 is an insulating substrate, 2a to 2d are first to fourth conductor paths arranged parallel to each other and attached to the substrate, and 3 is a sliding piece which slides in the direction in which the conductor paths are laid, perpendicular to the conductor paths.

When the sliding piece 3 slides, the first to fourth conductor paths 2a to
2d to make selective conductive contact with each of the first to fourth
In order to obtain a digital code signal corresponding to the 0th to 14th code areas (see figure), which are provided with contact springs 4a to 4d and arranged in order along the sliding direction of the sliding piece 3, An appropriately patterned insulating film 5 is applied to the surfaces of the first to fourth conductor paths 2a to 2d. That is, for example, when the sliding piece 3 is located in the seventh code area as shown in the figure, the sliding piece 3 selectively contacts only the third conductor path 2c, and therefore contacts the first to fourth conductor paths 2a to 2d. If a predetermined potential is applied to the ends 6a to 6d, the predetermined potential appears only in the third contact spring 4c, and if such a potential is logically set to "1", the sliding piece 3 in the seventh code area is the first one~
A code signal [0010] is generated in the fourth contact springs 4a to 4d.

Now, in the digital switch described above, if the length of each code area in the sliding direction is small, it becomes difficult to accurately set the sliding piece 3 to a desired code area. If the length of each code region is made sufficiently large, this problem will not occur, but on the other hand, the shape of the switch will become large, which is not preferable.

The present invention eliminates the above-mentioned drawbacks by changing the pattern of the conductor paths, and the present invention will be explained in the following examples.

FIG. 2 shows the conductor path pattern of the digital switch, in which A shows the same pattern as in FIG. 1, and B and C show the patterns in this embodiment.

In the embodiment of FIG. 2B, the fifth code region and the tenth code region
The length of the code region is set larger than the length of other code regions, and in the embodiment shown in FIG.
- The length of the fifth code area is set to be larger than the length of the sixth to fourteenth code areas.

Therefore, in the case of FIG. 2B, in each of the 5th and 10th code regions, and in the case of FIG. 2C, in the 1st to 10th code regions.
Even if the position of the sliding piece 3 in each of the fifth code areas is slightly shifted from the center of the code area, an accurate corresponding code signal is generated, making the setting operation easy. Such a specific position is determined to be a position that is set most frequently. For example, in a microwave oven with a digital control circuit, the above digital switch is used as a timer time setting input means,
Assuming that each of the above 1st to 14th code areas corresponds to each timer time of 1 minute to 14 minutes, the timer time of 1 minute to 5 minutes is usually set most frequently in microwave ovens. From Figure 2C above
The conductor path pattern may be used.

As is clear from the above explanation, according to the present invention, the present invention is provided with a sliding piece that selectively conducts conductive contact with a plurality of conductor paths, and is most frequently used, for example, in a digital switch that obtains a digital code signal according to the sliding piece. The length of only the code area that is displayed can be made larger than the length of other code areas, and the operability of the switch can be substantially improved without increasing the size of the switch.

Although the switch in the above embodiment is of a linear sliding type, the present invention can also be effectively applied to a rotating sliding type such as a volume switch.

[Brief explanation of the drawing]

FIG. 1A is a plan view showing a conventional example, FIG. 1B is a sectional view taken along line B-B of the same, FIG. FIG. 3 is a plan view showing a conductor path pattern. 2a to 2d...conductor path, 3...sliding piece.

Claims (1)

[Scope of utility model registration request] A sliding piece is provided that makes conductive contact selectively with a plurality of conductor paths, and the sliding piece is located corresponding to an arbitrary area of a plurality of code areas that are sequentially arranged along the sliding direction of the sliding piece. By this, in the digital switch that generates the corresponding digital code signal,
A digital switch characterized in that the length of the predetermined code area in the sliding direction is different from that of the other code areas.