JPS643721A - Key input device - Google Patents
Key input deviceInfo
- Publication number
- JPS643721A JPS643721A JP62159287A JP15928787A JPS643721A JP S643721 A JPS643721 A JP S643721A JP 62159287 A JP62159287 A JP 62159287A JP 15928787 A JP15928787 A JP 15928787A JP S643721 A JPS643721 A JP S643721A
- Authority
- JP
- Japan
- Prior art keywords
- key
- line
- keys
- pushed
- terminal
- 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
Landscapes
- Input From Keyboards Or The Like (AREA)
Abstract
PURPOSE:To prevent the occurrence of malfunctions of a key input device without using a diode nor an exclusive reading line, by distributing no key to one or both of the crossing positions between a specific 1st or 2nd key scan line and a 2nd or 1st key reading line. CONSTITUTION:A code key 48 is set at the crossing position between a scan line D5 and a read line K7 together with a shift key 55 set at the intersecting point between a scan line D6 and a red line K6, and an X key 47 set at the intersecting position between the line D5 and the line K6 respectively. When these keys are pushed, the input terminals K6 and K7 of a reading board K are set at '0' in case an arithmetic control par 61 scans the line D5. Thus it is decided that both keys 47 and 48 are pushed. While the push of the key 55 is decided since the terminal K6 is set at '0' when the line D6 is scanned. In this case the current flows on a read, line K7 to a terminal d6 via each key together with '0' inputted to a terminal d7. However no key is distributed at the crossing position between both lines D6 and K7 and therefore the signals are neglected to cause no malfunction. Furthermore no data is confirmed when three keys including the key 55 and other two keys except the key 48; while data are confirmed when the key 48 and >=3 keys except the key 55 are pushed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62159287A JPS643721A (en) | 1987-06-25 | 1987-06-25 | Key input device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62159287A JPS643721A (en) | 1987-06-25 | 1987-06-25 | Key input device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS643721A true JPS643721A (en) | 1989-01-09 |
Family
ID=15690499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62159287A Pending JPS643721A (en) | 1987-06-25 | 1987-06-25 | Key input device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS643721A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01205314A (en) * | 1988-02-12 | 1989-08-17 | Canon Inc | Input device |
JPH0387601U (en) * | 1989-12-26 | 1991-09-06 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS559220A (en) * | 1978-06-30 | 1980-01-23 | Fujitsu Ltd | Keyboard system |
JPS5839332A (en) * | 1981-09-02 | 1983-03-08 | Toshiba Corp | Keyboard device |
-
1987
- 1987-06-25 JP JP62159287A patent/JPS643721A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS559220A (en) * | 1978-06-30 | 1980-01-23 | Fujitsu Ltd | Keyboard system |
JPS5839332A (en) * | 1981-09-02 | 1983-03-08 | Toshiba Corp | Keyboard device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01205314A (en) * | 1988-02-12 | 1989-08-17 | Canon Inc | Input device |
JPH0387601U (en) * | 1989-12-26 | 1991-09-06 |
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