JPH039488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic device having a keyboard, such as an electronic desktop calculator.

In conventional electronic devices such as electronic desktop calculators, letters or characters indicating the function of each key are marked on the keyboard surface corresponding to each key, and key input from the keyboard is used to control calculations within the device. A typical structure is such that the signal is sent to a circuit for calculation control, and the calculation results are displayed on a liquid crystal display or the like. In addition, the keyboard has a mechanical movable part, that is, one consisting of a key top spring and a contact point, and a keyboard called a touch key. A structure is used in which the switch pattern and the contact pattern are formed on the opposing surfaces of the contacts in parallel with each other.

Now, in the conventional electronic desktop calculators mentioned above, there has been a recent trend in many of them to be able to change and expand the functionality of the device by making it possible to attach and remove additional program storage units such as so-called ROM packs. It's summery. However, in conventional devices, the keyboard had to be equipped with key switches corresponding to the number of ROM packs that could be attached, which resulted in a disadvantage that the keyboard became complicated. Furthermore, in small devices, it is not possible to allocate a large area to the keyboard, so if the number of key switches increases and the complexity increases, the size of the key switches will inevitably be reduced, resulting in poor operability. Therefore, it is recommended to install it on small equipment.
There was an inconvenience that it was not possible to increase the number of types of ROM packs.

The present invention has been made in view of the conventional problems as described above, and its purpose is to propose an electronic device in which an additional program storage unit can be attached and detached without complicating the keyboard. There is a particular thing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing a preferred embodiment. Note that the embodiment shows a case where the present invention is applied to an electronic desktop calculator.

FIG. 1 is a plan view of an electronic desk calculator according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a partially enlarged sectional view of the keyboard section. Figure 4 is a perspective view of the ROM pack, which is an additional program storage unit, and Part 5 A and B are cross-sectional views of the ROM pack attachment part of the electronic desk calculator according to the above embodiment and the installation of the ROM pack to the storage part. FIG. 2 is a diagram illustrating the method.

In each figure, 1 is the main body of the electronic desktop calculator, 1
-1 is the exterior, 2 is the keyboard part, 3 is the display part, 4 is the key that is displayed on the LCD on the keyboard part 2 when you turn on the power switch (common with the clear key, and "ON" is printed near it) 5 is the calculation result displayed on the display unit 3, 6 is the liquid crystal display, 7 is the printed circuit board, 7-1 is the calculation control element, 8 is the power supply battery, and 9 is the additional program storage unit. The mounting part, 11 is
The ROM pack 12 is a letter or character marked on the top surface of the ROM pack 11.

The keyboard part 2 has two transparent sheets 2-
1 and 2-2 (for example, polyester sheets, etc.) are arranged with a minute interval between them by sandwiching the spacer 2-5, and the sheets 2-1 and 2-2 are
Transparent patterns 2- that can be contacted with each other as contact patterns at formation positions on mutually opposing surfaces of the
3 and 2-4 are formed by vapor deposition to form a key switch. In addition, these transparent patterns 2-3, 2-4
is made of a material such as indium oxide. Further, a liquid crystal display 6 is inserted and extended from the display section 3 to the front side of the mounting section 9 under the sheet 2-2 of the keyboard section 2. A portion of the keyboard section 2 of the liquid crystal display 6 that corresponds to the key switches is formed with a transparent pattern that can display characters or characters that indicate the function corresponding to each key switch. It is set as.

Furthermore, a printed circuit board 7 on which an arithmetic control element 7-1 is mounted is arranged below the liquid crystal display 6, and a power supply battery 8 is housed in a part of the lower part of the printed circuit board 7. The sheets 2-1, 2-2 and the printed circuit board 7 are electrically connected by conductive connectors or other means, and are connected to the liquid crystal display 6 and the power battery 8.
and printed circuit board 7 are pressed together and electrically connected.

As a result, when the power switch (common with the clear key and printed "ON" near it on the keyboard) is turned on, the keyboard section 2 of the liquid crystal display 6
The above-mentioned letters or characters are illuminated in the portion corresponding to each key, and the position and function of each key is displayed through the transparent sheet 2-1. Then, by pressing your finger on the top of the display area,
A predetermined key signal is input.

Next, in the attachment part 9 of the ROM pack 11, a connector part 10 having a terminal 10-1 for electrically connecting the main body 1 and the ROM pack 11 is provided. Further, the above-mentioned keyboard section 2 is located above the mounting section 9. And ROM
By storing the pack 11 in the mounting part 9,
Characters 12 indicating the functions of the ROM pack 11 printed on the top surface of the ROM pack 11 are visible through the keyboard section 2.
Furthermore, the keyboard section 2 on which the letters or characters 12 on the upper surface of the ROM pack 11 housed in the mounting section 9 are displayed is provided with a key switch for inputting a key signal indicated by the letters or characters 12 in the same manner as described above. . It goes without saying that this key switch is constructed so that when a ROM pack having other functions is attached, a key signal corresponding to the letters or characters marked on the top surface of the ROM pack can be input.

As described above, by storing the ROM pack 11 in the mounting part 9 and pressing the part of the keyboard section corresponding to the character or character 12 marked on the top surface of the ROM pack 11, the key signal indicated by the character or character 12 can be input. It is something. Therefore, even if a plurality of ROM packs 11 are replaced and connected, the key switches on the keyboard section 2 for inputting key signals only need to be provided for one ROM pack.

As explained above, according to the present invention, the number of key switches in the keyboard section is only one additional program storage unit, so the keyboard section does not become complicated. Therefore, although it is a small device, if you connect more types of additional program storage units, the functions will increase.
There will be no inconvenience such as poor operability.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an electronic desk calculator according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, FIG. 3 is a partially enlarged sectional view of the keyboard section, and FIG. The figure is a perspective view of a ROM pack which is an additional program storage unit, and Figures 5A and 5B show the ROM of the electronic desk calculator according to the above embodiment.
Cross-sectional view of the pack mounting part and ROM to the mounting part
It is a figure which shows the pack attachment method. Here, 1...electronic desktop calculator main body, 1-1...
Exterior, 2... Keyboard part, 2-1, 2-2... Transparent sheet, 2-3, 2-4... Transparent pattern, 6... Liquid crystal display, 9... ROM pack mounting part, 10... Connector part, 10-1 ...Connection terminal, 11...ROM pack, 12...Character or character.

Claims (1)

[Claims] 1. In an electronic device having a keyboard section formed by disposing two sheet-like elastic bodies with a predetermined minute interval and providing electrodes on opposing surfaces of the elastic bodies to form a key switch, the keyboard section at least a part of the transparent elastic body is made transparent by a transparent electrode, and a storage unit for an additional program can be connected to the lower part of the transparent part of the keyboard part, and the surface of the upper part of the storage unit facing the keyboard part. An electronic device characterized in that a symbol indicating a function of the key switch is attached to the key switch.