JPS5574632A - Key unit - Google Patents

Key unit

Info

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
Application number
JP14834578A
Other languages
Japanese (ja)
Other versions
JPS6142291B2 (en
Inventor
Hisao Mogi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP14834578A priority Critical patent/JPS5574632A/en
Publication of JPS5574632A publication Critical patent/JPS5574632A/en
Publication of JPS6142291B2 publication Critical patent/JPS6142291B2/ja
Granted legal-status Critical Current

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
JP14834578A 1978-11-30 1978-11-30 Key unit Granted JPS5574632A (en)

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)

Also Published As

Publication number Publication date
JPS6142291B2 (en) 1986-09-20

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