JPS562038A - Coordinate input unit - Google Patents
Coordinate input unitInfo
- Publication number
- JPS562038A JPS562038A JP7793679A JP7793679A JPS562038A JP S562038 A JPS562038 A JP S562038A JP 7793679 A JP7793679 A JP 7793679A JP 7793679 A JP7793679 A JP 7793679A JP S562038 A JPS562038 A JP S562038A
- Authority
- JP
- Japan
- Prior art keywords
- line
- signal
- light
- input
- light pen
- 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
- Position Input By Displaying (AREA)
Abstract
PURPOSE: To obtain an inexpensive coordinate input unit of light pen control that is never influenced by external-light shadows, by detecting and processing at least two or more input signals while the 1st signal of a light pen is being input.
CONSTITUTION: With the operation switch of a light pen pushed, a switch signal from line 12 and a photo detection signal from line 11 are input to AND gate 1, the output of which sets FF2. The 2nd pulse signal from line 11 triggers monostable multivibrator 4, the operation time of which is set by the time constant of resistance R and capacitor C, and when the operation of monostable multivibrator 4 ends, line 15 is sensed. When no signal arrives from line 15, display data on a normal screen are considered to have been pointed out and FF6 is set to set coordinate values by the Q output of FF6. Since detected light lasts for a long time in case of external light, etc., the detection signal is sent out in sense operation by multivibrator 4 and FF6 is not set, so that no influence of afterglow will be exerted.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7793679A JPS562038A (en) | 1979-06-20 | 1979-06-20 | Coordinate input unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7793679A JPS562038A (en) | 1979-06-20 | 1979-06-20 | Coordinate input unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS562038A true JPS562038A (en) | 1981-01-10 |
Family
ID=13647956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7793679A Pending JPS562038A (en) | 1979-06-20 | 1979-06-20 | Coordinate input unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS562038A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5872237A (en) * | 1981-10-27 | 1983-04-30 | Hitachi Ltd | Picture element detecting device using light pen |
-
1979
- 1979-06-20 JP JP7793679A patent/JPS562038A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5872237A (en) * | 1981-10-27 | 1983-04-30 | Hitachi Ltd | Picture element detecting device using light pen |
JPH0315769B2 (en) * | 1981-10-27 | 1991-03-01 | Hitachi Ltd |
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