JPS5574632A - Key unit - Google Patents
Key unitInfo
- Publication number
- JPS5574632A JPS5574632A JP14834578A JP14834578A JPS5574632A JP S5574632 A JPS5574632 A JP S5574632A JP 14834578 A JP14834578 A JP 14834578A JP 14834578 A JP14834578 A JP 14834578A JP S5574632 A JPS5574632 A JP S5574632A
- Authority
- JP
- Japan
- Prior art keywords
- switches
- key
- signals
- output signals
- outputted
- 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.)
- Granted
Links
Abstract
PURPOSE: To enable double pushing of key switch, by increasing the number of key inputs, without increasing the number of the key input and output terminals through the addition of a simple circuit.
CONSTITUTION: The reception circuit 2 and the signal production circuit 3 inputting the input signals Ti1, Ti2 of the switches S1WS4 are connected to the matrix 1 having the key switches S1WS4, and the key output signals K01WK04 can be outputted by discriminating the input signals Ti1 and Ti2. Further, the switches S5 and S6 possible for double pushing are provided other than the switches S1WS4, and the switches S5 and S6 are connected to the terminal 4 enabling the obtain positive DC voltage. Further, the output side of the switches S5 and S6 is connected to the duration time detection circuits 5 and 6 detecting the duration time when the key output signals Ki1WKi2 are both at logical 1, and when the DC signal in which the state of logical 1 for more than a given time is continued at the output terminals T1WT4 is outputted, it is detected at the detection circuits 5 and 6 to discrunubate the key output signals K01WK04 of the switches S1WS4.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14834578A JPS5574632A (en) | 1978-11-30 | 1978-11-30 | Key unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14834578A JPS5574632A (en) | 1978-11-30 | 1978-11-30 | Key unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5574632A true JPS5574632A (en) | 1980-06-05 |
JPS6142291B2 JPS6142291B2 (en) | 1986-09-20 |
Family
ID=15450679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14834578A Granted JPS5574632A (en) | 1978-11-30 | 1978-11-30 | Key unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5574632A (en) |
-
1978
- 1978-11-30 JP JP14834578A patent/JPS5574632A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6142291B2 (en) | 1986-09-20 |
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