JPH0170428U - - Google Patents
Info
- Publication number
- JPH0170428U JPH0170428U JP1987166232U JP16623287U JPH0170428U JP H0170428 U JPH0170428 U JP H0170428U JP 1987166232 U JP1987166232 U JP 1987166232U JP 16623287 U JP16623287 U JP 16623287U JP H0170428 U JPH0170428 U JP H0170428U
- Authority
- JP
- Japan
- Prior art keywords
- key
- source
- active
- signal
- impedance state
- 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
Links
- 239000011159 matrix material Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Description
第１図、第２図は本考案の第１、第２の実施例
を示す回路図で、第３図は従来の回路例、第４図
はスイツチＳ１、スイツチＳ２を同時にＯＮした
時の電流の経路を示した図である。
１……ＩＣ、１′……ＩＣ、２〜５……逆流防
止用ダイオード、Ｓ１，Ｓ２……スイツチ、ＫＳ
０〜ＫＳ３，ＫＳ０′〜ＫＳ３′……キーソース
信号出力端子、Ｋ０〜Ｋ３，Ｋ０′〜Ｋ３′……
キーリターン信号入力端子。
Figures 1 and 2 are circuit diagrams showing the first and second embodiments of the present invention, Figure 3 is a conventional circuit example, and Figure 4 is the current when switches S1 and S2 are turned on at the same time. FIG. 1...IC, 1'...IC, 2-5...backflow prevention diode, S1, S2...switch, KS
0 ~ KS3 , KS0 '~ KS3 '...Key source signal output terminal, K0 ~ K3 , K0 '~ K3 '...
Key return signal input terminal.
Claims (1)
クスを構成するキーマトリツクス回路において、
キーソース信号がアクテイブのとき信号源をロー
インピーダンスとし、ノンアクテイブのときハイ
インピーダンス状態となる出力回路を有すること
を特徴とするキーマトリツクス回路。 In a key matrix circuit that configures a matrix with key source signals and key return signals,
1. A key matrix circuit comprising an output circuit that sets a signal source to a low impedance state when the key source signal is active and to a high impedance state when the key source signal is non-active.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166232U JPH0170428U (en) | 1987-10-29 | 1987-10-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166232U JPH0170428U (en) | 1987-10-29 | 1987-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0170428U true JPH0170428U (en) | 1989-05-10 |
Family
ID=31453436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987166232U Pending JPH0170428U (en) | 1987-10-29 | 1987-10-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0170428U (en) |
-
1987
- 1987-10-29 JP JP1987166232U patent/JPH0170428U/ja active Pending
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