JPS6022385B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electronic device that can be removably attached to a programmable small calculator, etc., and that can automatically change the key display by inserting a ROM (hereinafter referred to as ROM) into a loading section. It concerns equipment.

In the past, there were calculators that prevented an increase in the number of keys by inserting a ROM for statistics, trigonometric functions, etc. into the main body to change the key definitions. Keys were displayed using measures such as setting the keys in place. Therefore, additional R for expansion
A plate for displaying keys must be prepared for each OM, and it is necessary to attach and detach the plate, which often results in attaching another template, and there is also the risk of losing the plate. In view of the above-mentioned difficulties, the present invention is configured such that by inserting an additional ROM, the display of keys whose definitions have been changed is automatically changed.

FIG. 1 is a schematic diagram of an embodiment of the present invention, where R is a ROM for adding functions, S is a switch for detecting that the ROM is loaded, C is a main body of the computer, and K is a keyboard.

The keyboard K includes a large number of key tops as shown in FIG.
Display elements made of electrochromy or the like are arranged in a dot matrix, and various patterns such as sine and cos can be displayed by inserting a ROM. To form this pattern, it is sufficient to selectively drive the character generator A in the main body C by instructions in the ROM, or to provide a unique character generator A' in the ROM. The cable connection may be made via the flexible wiring board F, and the above can be easily achieved using ordinary digital technology and display technology.

It can also function as a spring for returning the key. Furthermore, it is clear that this key display is not limited to the top surface of the key tops, and the same effect can be expected even if it is placed near the key tops. In addition, this key display not only uses an electronic display, but also selectively drives character wheels, character belts, etc. that do not require power for display.

You can also display text from nearby windows. It is also effective to use a non-volatile display material such as electrochromy, as it can save power. As described above, the present invention is capable of automatically changing the display of keys simply by inserting one or more ROMs for adding functions into the main body, and the arithmetic elements are increasingly miniaturized, making it possible to use limited keyboard area and This has a great practical effect under the restriction of the number of keys.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the present invention, and FIG. 2 is an example of a key top used in FIG. 1. R...Read-only memory, C...Main unit, K...
…keyboard. Blind drawing grandchild drawing 2 drawings

Claims (1)

[Claims] 1 A ROM that is removably attached to the main body and stores arithmetic control information is provided with a key display instruction or a character generator to display the key functions when the ROM is inserted and used. An electronic device characterized in that when the key is inserted, a key is displayed on the key according to the command or the contents of the character generator.