JPS5682936A - Light pen output circuit - Google Patents

Light pen output circuit

Info

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
Application number
JP16026979A
Other languages
Japanese (ja)
Other versions
JPS593778B2 (en
Inventor
Koji Yokoyama
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP54160269A priority Critical patent/JPS593778B2/en
Publication of JPS5682936A publication Critical patent/JPS5682936A/en
Publication of JPS593778B2 publication Critical patent/JPS593778B2/en
Expired legal-status Critical Current

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
JP54160269A 1979-12-12 1979-12-12 light pen output circuit Expired JPS593778B2 (en)

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)

Also Published As

Publication number Publication date
JPS593778B2 (en) 1984-01-26

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