JPH04267414A - Keyboard - Google Patents

Abstract

PURPOSE:To eliminate the need of procuring a separate control unit by connecting two kinds of ten key modules to one type of standard keyboard and using them. CONSTITUTION:A standard keyboard 1 is connected to a main unit 2 via an interface cable 5. A ten key module (A)2 and a ten key module (B)6 are connected to the standard keyboard 1 via a connector 4 through interface cables 3 and 7, respectively. A one-chip microcomputer scans the key matrix of the standard keyboard 1 and the key matrix of the ten key modules, detects the ON/OFF of the key and discriminates the ten key modules. The ten key modules are provided with a ten key matrix and an identification part.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard, and more particularly to a keyboard with a numeric keypad module that is widely used as an input device for information processing devices.

0002

2. Description of the Related Art Conventional keyboards with a numeric keypad module of this type do not have an identification section on the numeric keypad module, and the standard keyboard does not have a discrimination function.

0003

[Problems to be Solved by the Invention] In the conventional keyboard with a numeric keypad module described above, one type of numeric keypad module corresponds to one type of standard keyboard.
When connecting another numeric keypad module, there was a problem in that the control unit of the standard keyboard had to be changed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a keyboard that solves the above problems and does not require changing the control unit even when connecting another numeric keypad module.

[0005]

[Means for Solving the Problems] The structure of the keyboard of the present invention includes a key matrix having a standard key arrangement excluding a numeric keypad, and a key matrix that detects the press of a key and determines a connected numeric keypad module. a standard keyboard having a control unit having a function of switching to a key code; a key matrix having at least a numeric keypad arrangement and an identification section; and a plurality of numeric keys having a connecting means for electrically connecting with the standard keyboard. It is characterized by having a module.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a layout diagram showing the layout of a keyboard according to an embodiment of the present invention.

In FIG. 1, in this embodiment, a standard keyboard 1 is connected to two main bodies via an interface cable 5. The numeric keypad module (A) 1 and the numeric keypad module (B) 6 are connected to the standard keyboard 1 via the connector 4 by interface cables 3 and 7, respectively.
is connected to.

FIG. 2 is a block diagram of a control unit installed in the standard keyboard 1 of FIG.

In FIG. 2, a one-chip microcomputer (microcomputer) 8 has a key matrix 9 of a standard keyboard 1 and a key matrix 4 of a numeric keypad module.
is scanned to detect key ON/OFF and determine the numeric keypad module.

FIGS. 3(a), 3(b), and 3(c) are circuit diagrams showing the key matrix of the numeric keypad module of FIG. 1, and the identification portions of the numeric keypad modules (A) and (B).

In FIG. 3, this numeric keypad module has the following features:
It has a [5×8] numeric keypad matrix, a [5×8] numeric keypad matrix, and a [1×8] identification section. In FIG. 3(b), [Y1] is shorted in the numeric keypad module (A) of FIG. 1, and in FIG. 3(c), [Y1] is shorted in the numeric keypad module (B), so this matrix The one-chip microcomputer 8 of the standard keyboard 1 that is scanning the keypad can determine whether either the numeric keypad module (A) or (B) is connected.

FIG. 4 is a flowchart showing the operation flow of the one-chip microcomputer 8 of FIG. 2.

In FIG. 4, the standard key matrix is scanned (step 20), then the initial setting of the numeric keypad scan (step 21) is performed, and then the ID scan (step 2) is performed.
2), select the numeric keys A/B (step 23), set the key code (step 24 or 25), perform a numeric key scan (step 26), and return to the original step 20.

That is, just before scanning the numeric keypad (step 26), the numeric keypad is identified, and after the key code is switched, the numeric keypad is scanned. Every week of scanning, power on (POW) is performed to identify the numeric keypad.
Even if the numeric keypad is replaced in the state of ER ON), it will not malfunction.

[0015] In step 22, scanning is performed [
If Y0] is shorted, press numeric keypad (A), [Y1]
If there is a short circuit, the numeric keypad (B) will be selected.

[0016]

[Effects of the Invention] As explained above, the present invention has the advantage that two or more types of numeric keypad modules can be connected and used with one type of standard keyboard, so there is no need to prepare a separate control unit. .

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing the layout of a keyboard according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control unit of the standard keyboard of FIG. 1;

3(a), (b), and (c) are circuit diagrams showing the matrix and identification section of the numeric keypad module in FIG. 1, and circuit diagrams showing the identification sections of the numeric keypad modules (A) and (B); FIG.

FIG. 4 is a flow diagram showing the operation of the one-chip microcomputer shown in FIG. 2;

[Explanation of symbols]

1 Standard keyboard 2 Numeric keypad module A 3 Interface cable 4 Connector 5 Interface cable 6 Numeric keypad module B 7 Interface cable 8 One-chip microcontroller

Claims (1)

[Claims] [Claim 1] A key matrix having a standard key arrangement excluding a numeric keypad, and a control unit having a function of detecting the press of a key, determining a connected numeric keypad module, and switching to the key code of the numeric keypad module. a standard keyboard having at least a numeric keypad arrangement and a key matrix having an identification section;
A keyboard comprising: a numeric keypad module having connection means for electrically connecting with the standard keyboard.