JPS55124838A - Light pen control unit - Google Patents

Light pen control unit

Info

Publication number
JPS55124838A
JPS55124838A JP3368279A JP3368279A JPS55124838A JP S55124838 A JPS55124838 A JP S55124838A JP 3368279 A JP3368279 A JP 3368279A JP 3368279 A JP3368279 A JP 3368279A JP S55124838 A JPS55124838 A JP S55124838A
Authority
JP
Japan
Prior art keywords
light pen
phosphor
time
residual
light
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
Application number
JP3368279A
Other languages
Japanese (ja)
Inventor
Tatsuo Yamamoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3368279A priority Critical patent/JPS55124838A/en
Publication of JPS55124838A publication Critical patent/JPS55124838A/en
Pending legal-status Critical Current

Links

Landscapes

  • Position Input By Displaying (AREA)

Abstract

PURPOSE: To avoid the error detection due to phosphor residual time, by making effective the write-in pulse of light pen, after longer time than residual time of phosphor during non-display section through taking the first of non-display section including blanking period as start point.
CONSTITUTION: When the light pen 7 is touched to the point of character or graph displayed on the monitor 6 and the light pen switch is depressed, the write-in pulse and the light pen switch signal are fed to the light pen signal control circuit 11 from the light pen 7. The light pen signal control circuit 11 does not produce the address storage and interruption to the address register 8 until the vertical synchronizing signal VSYNC is detected. Since the time until the vertical synchronizing signal VSYNC is detected is longer than the residual time of phosphor, this residual light can avoid error detection.
COPYRIGHT: (C)1980,JPO&Japio
JP3368279A 1979-03-22 1979-03-22 Light pen control unit Pending JPS55124838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3368279A JPS55124838A (en) 1979-03-22 1979-03-22 Light pen control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3368279A JPS55124838A (en) 1979-03-22 1979-03-22 Light pen control unit

Publications (1)

Publication Number Publication Date
JPS55124838A true JPS55124838A (en) 1980-09-26

Family

ID=12393198

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3368279A Pending JPS55124838A (en) 1979-03-22 1979-03-22 Light pen control unit

Country Status (1)

Country Link
JP (1) JPS55124838A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582927A (en) * 1981-06-30 1983-01-08 Nec Home Electronics Ltd Superposing device for detecting signal of light pen
JPH01300682A (en) * 1988-05-27 1989-12-05 Sharp Corp Method for recording information representing optional position on television screen onto video signal superimposingly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582927A (en) * 1981-06-30 1983-01-08 Nec Home Electronics Ltd Superposing device for detecting signal of light pen
JPH01300682A (en) * 1988-05-27 1989-12-05 Sharp Corp Method for recording information representing optional position on television screen onto video signal superimposingly

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