JPS5682936A - Light pen output circuit - Google Patents
Light pen output circuitInfo
- Publication number
- JPS5682936A JPS5682936A JP16026979A JP16026979A JPS5682936A JP S5682936 A JPS5682936 A JP S5682936A JP 16026979 A JP16026979 A JP 16026979A JP 16026979 A JP16026979 A JP 16026979A JP S5682936 A JPS5682936 A JP S5682936A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- pulses
- color
- light pen
- cathode
- 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
Landscapes
- Position Input By Displaying (AREA)
Abstract
PURPOSE: To automate gain control by equalizing the number of pulses by making the pulse width of each color constant, by regarding as a comparison voltage an output voltage that corresponds to a count value for any color of raster light detected from the display screen of a cathode-ray tube.
CONSTITUTION: A pulse signal, obtained by bringing light pen 2 into contact with the display screen of cathode-ray tube 1, is compared with a reference voltage from voltage source C by the 1st voltage comparator 5, whose output pulses are counted, thereby regarding the output voltage, which corresponds to the count value, as comparison voltage D of the 2nd voltage comparator 4. Since this voltage based upon the width and number of pulses is higher as they are greater, any color of red, green and blue can be outputted with constant pulse width and an equal number of pulses. Therefore, data can be written with the light pen under the same condition regardless of color.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54160269A JPS593778B2 (en) | 1979-12-12 | 1979-12-12 | light pen output circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54160269A JPS593778B2 (en) | 1979-12-12 | 1979-12-12 | light pen output circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5682936A true JPS5682936A (en) | 1981-07-07 |
JPS593778B2 JPS593778B2 (en) | 1984-01-26 |
Family
ID=15711340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54160269A Expired JPS593778B2 (en) | 1979-12-12 | 1979-12-12 | light pen output circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS593778B2 (en) |
-
1979
- 1979-12-12 JP JP54160269A patent/JPS593778B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS593778B2 (en) | 1984-01-26 |
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