JPS5821460Y2 - Key top support structure for keyboard - Google Patents

Description

[Detailed description of the invention] This invention relates to a support structure for key tops applied to keyboards of electronic desktop calculators, electric cash registers, etc.
In particular, this invention relates to a key top support structure for a keyboard that allows a large key top that spans multiple key switches to be easily attached by simply changing the shape of the key top without replacing the key switch, and maintains stable operating force. It is something.

Conventionally, in a keyboard 1 as shown in FIGS. 1 and 2, a key top 2 spanning multiple keys has two key springs compared to a normal key top as shown in FIGS. 3 and 4. 3, 3, so in order to eliminate the difference in the pushing force between the two, the key spring 3,
In addition, the key switch 5a on one side was used as a dummy key 4 so that only the key switch 5b on the other side worked.

Therefore, when trying to replace a normal key top with a large key top (Fig. 3), key switches 5C and 5d
This has the disadvantage that it requires extra time and effort to replace the key tops, making the installation troublesome, and also goes against the desire to flexibly change the key tops.

That is, two types of key processing programs are built in, and by switching the changeover switch, you can select either program and change the key properties (for example, 1°2,...
・l + 'l + .

This idea was made in order to improve the above-mentioned drawbacks, and it is easy to install large key tops that span multiple keys without replacing the key switch, and also allows the key top to be easily installed without weakening the stress of the key spring. It is an object of the present invention to provide a key top support structure for a keyboard that stably maintains operation.

Hereinafter, an embodiment of this invention will be explained in detail based on FIGS. 5 and 6.

Key switches 5a, 5 attached to the keyboard 1
A key stay 63.6b is provided at each of the key stays 63.6b, and each of the key stays 6a, 6b has a key spring 3 fixed at one end to the key stays 6a, 6b.
, 3 are installed, and the key top is attached.

This key top 7 is a large key top spanning a plurality of key switches 5a and 5b.
, 5b is fixed to one end of the key stay 6a.

Further, the key stay 6b of the other key switch 5b is loosely fitted into a recessed portion 7a formed by leaving a portion of the key top 7 to which the key stay 6a is fixed, and the loose fit is at the end of the key stay 6b. A gap larger than the key-in operation stroke of the key switch 5a is maintained between the recessed portion 7a and the top wall 7b.

Now, when using a key switch whose key scan sequence generates a key signal as shown in Figure 6A,
According to the above configuration, when the key top 7 is pressed, the key switch 5a is first keyed in within the operation stroke h of the key top 7, as shown in the opening of FIG. The key stay 6b is pressed by the wall 7b, thereby turning on the key switch 5b.

Next, when the key top 7 is released, the key switch 5b is turned off first, and then the key switch 5a is turned off, so that only the key switch 5a has been keyed in by the above operation.

On the other hand, the key springs 3, 3 interposed between the key stays 6a, 6b are no different from conventional spring stress, but at the beginning of pressing the key top 7, only the stress of the spring 3 of the key switch 5a acts, Thereafter, the spring 3 of the key switch 5b is actuated by pressing the key stay 6b, so that the initial force for pressing the key top 7 is the same as the force for pressing one key.

As described in detail above, this invention, in a key top that spans a plurality of key switches, fixes one end of the key stay of at least one key switch to the key top in the conventional manner, and fixes the other key switch to a key stay that is fitted with a spring. The key switch is loosely fitted into the recess formed in the key top through the key switch, and one end of the key stay of the key switch has a distance between it and the top wall of the recess that is longer than the operation stroke of the at least one key switch. By maintaining a gap of 100 degrees and shifting the key timing of both key switches, when replacing a regular key top with a large key top, the key switch on the key stay that is loosely fitted will not stick even if the key switch is activated. The key switch of the key stay operates preferentially and does not accept other key signals, so as in the past, the second key switch of the two key switches must be used as a dummy key switch, that is, by disconnecting the wire or disabling the contact function. There is no need to use a key switch that has been removed, etc., and it is only necessary to replace the key top, so even when restoring the original key top again, it is a simple operation.

Furthermore, at the beginning of pressing the key top, the stress on the key top is equal to the stress of the spring attached to the key stay of at least one key switch, and the stress of the spring attached to the other key stay does not act, so the stress on the key top is equal to the stress of the spring attached to the key stay of at least one key switch. There is no need to change the stress on the key top, and the key top can be pressed with the same operating force as a normal key top, without giving the operator a sense of resistance.

In this way, there is a practical effect that the key top can be easily attached by simply changing the shape of the key top to match the multiple key switches.

In addition, as mentioned above, the conventional type has two types of key processing programs built-in, and cannot meet the requirements of a flexible board in which the characteristics of the keys can be changed by selecting one of the programs by switching the changeover switch. However, the implementation of this idea has the effect of making this possible.

[Brief explanation of drawings]

Figures 1 and 2 are plan views showing an embodiment of the keyboard, Figures 3 and 4 are side views and sectional views showing a conventional key top support structure, and Figure 5 is an embodiment of the invention. The cross-sectional view, FIG. 6, is the sequence waveform of FIG. 5. 1... Keyboard, 3... Spring, 5 a, 5 b... Key switch, 6 a
, 6b...Key stay 7...Key top, 7a...Recessed portion, 7b...Top wall, h...Gap.

Claims (1)

[Scope of utility model registration request] Key tops 1, 2, 3° placed on keyboard 1...
...×, ÷..., etc. In the key top 2 spanning two key switches, the first key switch 5a of the two key tops has a spring 3. A key stay receiver provided on the key top 7 corresponding to the key top 2 is inserted into a hole via the attached key stay 6a, and the second key switch 5b of the two key tops is fixed with a spring. The structure is such that the key stay 6b with the key 3 mounted thereon is allowed to freely play in the gap 7a formed inside the key top 7, and the end of the key stay 6b and the top wall 7b of the gap 7a are connected to each other.
A key top support structure for a keyboard, characterized in that a gap is provided between the key top and the key switch, the gap being larger than the operating stroke of at least one key switch.