JPS5885229U - key matrix circuit - Google Patents

key matrix circuit

Info

Publication number
JPS5885229U
JPS5885229U JP17687381U JP17687381U JPS5885229U JP S5885229 U JPS5885229 U JP S5885229U JP 17687381 U JP17687381 U JP 17687381U JP 17687381 U JP17687381 U JP 17687381U JP S5885229 U JPS5885229 U JP S5885229U
Authority
JP
Japan
Prior art keywords
signal lines
input
matrix circuit
key matrix
signal line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17687381U
Other languages
Japanese (ja)
Inventor
峰村　信司
Original Assignee
富士ゼロックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士ゼロックス株式会社 filed Critical 富士ゼロックス株式会社
Priority to JP17687381U priority Critical patent/JPS5885229U/en
Publication of JPS5885229U publication Critical patent/JPS5885229U/en
Pending legal-status Critical Current

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  • Input From Keyboards Or The Like (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２図はそれぞれ従来のキーマトリクス回
路の一例を示す回路図、第３図は本考案の一実施例の回
路図である。 １・・・マイコン、ＳＬ１〜ＳＬ３・・・スキャン信号
線、Ｔ１〜Ｔ３・・・出力ポート、ＫＲ１〜ＫＲ４・・
・入力ポート、ＩＬｌ〜ＩＬ４・・・入力信号線。1 and 2 are circuit diagrams showing an example of a conventional key matrix circuit, respectively, and FIG. 3 is a circuit diagram of an embodiment of the present invention. 1...Microcomputer, SL1-SL3...Scan signal line, T1-T3...Output port, KR1-KR4...
- Input ports, ILl to IL4...input signal lines.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] マトリクス状に配列された複数のスキャン信号線および
複数の入力信号線と、両信号線の各文さ点の少なくとも
一部に、前記スキャン信号線と入力信号線とを接続する
ように配置された複数のスイッチと、前記各入力信号線
とグランド間にそれぞれ接続されたプルダウン抵抗とを
具備したキーマトリクス回路において、前記入力信号線
のうち少なくとも１つの特定信号線およびこれに対応す
る入力ポートとの間に直列接続された抵抗と、前記特定
信号線の入力ポートおよび前記スキャン信号線の１つと
の間に接続された整流素子とを具備したことを特徴とす
るキーマトリクス回路。A plurality of scan signal lines and a plurality of input signal lines arranged in a matrix, and a plurality of scan signal lines and a plurality of input signal lines arranged so as to connect the scan signal line and the input signal line to at least a part of each line point of both signal lines. A key matrix circuit comprising a plurality of switches and a pull-down resistor connected between each of the input signal lines and ground, wherein at least one specific signal line among the input signal lines and a corresponding input port are connected to each other. A key matrix circuit comprising: a resistor connected in series between the input ports of the specific signal line and a rectifying element connected between the input port of the specific signal line and one of the scan signal lines.
JP17687381U 1981-11-30 1981-11-30 key matrix circuit Pending JPS5885229U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17687381U JPS5885229U (en) 1981-11-30 1981-11-30 key matrix circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17687381U JPS5885229U (en) 1981-11-30 1981-11-30 key matrix circuit

Publications (1)

Publication Number Publication Date
JPS5885229U true JPS5885229U (en) 1983-06-09

Family

ID=29970232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17687381U Pending JPS5885229U (en) 1981-11-30 1981-11-30 key matrix circuit

Country Status (1)

Country Link
JP (1) JPS5885229U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178634U (en) * 1988-06-09 1989-12-21
JP2012112576A (en) * 2010-11-24 2012-06-14 Harman Co Ltd Operation detection circuit for operation switch, and heating cooker using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178634U (en) * 1988-06-09 1989-12-21
JP2012112576A (en) * 2010-11-24 2012-06-14 Harman Co Ltd Operation detection circuit for operation switch, and heating cooker using the same

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