JPS5720026A - Touch switch circuit - Google Patents
Touch switch circuitInfo
- Publication number
- JPS5720026A JPS5720026A JP9479380A JP9479380A JPS5720026A JP S5720026 A JPS5720026 A JP S5720026A JP 9479380 A JP9479380 A JP 9479380A JP 9479380 A JP9479380 A JP 9479380A JP S5720026 A JPS5720026 A JP S5720026A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- closed
- opened
- switches
- hold
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/02—Details
Landscapes
- Electronic Switches (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
Abstract
PURPOSE:To prevent erroneous operation due to the forgetful nonclosure of a hold switch, by providing a display element for the confirmation of the operation state of the hold switch. CONSTITUTION:For normal operation, a hold switch 15 is closed and touch switches 11-13 are closed optionally. When one of the switches 11-13 is closed, a potential at a corresponding input terminal of a key controller 14 varies and this potential variations are latched by the controller 14 to set a selected mode. In this state, opening the switch 15 turns on a transistor 22 to turn on a light emitting element 21. Then, the switch 15 is found opened by confirming the turning-on of this element 21. When this switch 15 is opened, an operation mode never changes even if another touch switch is closed, so that any malfunction does not occur.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9479380A JPS5720026A (en) | 1980-07-11 | 1980-07-11 | Touch switch circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9479380A JPS5720026A (en) | 1980-07-11 | 1980-07-11 | Touch switch circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5720026A true JPS5720026A (en) | 1982-02-02 |
JPH0324097B2 JPH0324097B2 (en) | 1991-04-02 |
Family
ID=14119945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9479380A Granted JPS5720026A (en) | 1980-07-11 | 1980-07-11 | Touch switch circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5720026A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS612419A (en) * | 1984-06-15 | 1986-01-08 | Toshiba Corp | Switching circuit |
JPH0340987U (en) * | 1989-08-21 | 1991-04-19 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5586029A (en) * | 1978-12-22 | 1980-06-28 | Janome Sewing Machine Co Ltd | Touch switch |
-
1980
- 1980-07-11 JP JP9479380A patent/JPS5720026A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5586029A (en) * | 1978-12-22 | 1980-06-28 | Janome Sewing Machine Co Ltd | Touch switch |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS612419A (en) * | 1984-06-15 | 1986-01-08 | Toshiba Corp | Switching circuit |
JPH0340987U (en) * | 1989-08-21 | 1991-04-19 |
Also Published As
Publication number | Publication date |
---|---|
JPH0324097B2 (en) | 1991-04-02 |
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