JPS5588135A - Printing preventive unit for fluorescent substance on display cathode-ray tube screen - Google Patents
Printing preventive unit for fluorescent substance on display cathode-ray tube screenInfo
- Publication number
- JPS5588135A JPS5588135A JP16275078A JP16275078A JPS5588135A JP S5588135 A JPS5588135 A JP S5588135A JP 16275078 A JP16275078 A JP 16275078A JP 16275078 A JP16275078 A JP 16275078A JP S5588135 A JPS5588135 A JP S5588135A
- Authority
- JP
- Japan
- Prior art keywords
- ray tube
- printing
- power switch
- voltage
- fluorescent substance
- 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
- Digital Computer Display Output (AREA)
Abstract
PURPOSE: To prevent a fluorescent-substance printing phenomenon of a display cathode-ray tube by varying a vertical deflecting voltage by superposing the output of a random-number generating circuit upon a saw-tooth wave every time a power switch is turned ON.
CONSTITUTION: With power switch S ON, a DC voltage developed across converter 6 is charged in capacitor C10, but until it reaches a fixed voltage, "1" is inputted from inverter 7 to terminal CE to allow counter 5 to count clock pulses of a horizontal synchronizing signal. The moment capacitor C10 is charged up to the constant voltage, an input to terminal CE becomes zero to stop the count operation, and the count value at that time is D/A-converted; and a saw-tooth wave and DC level obtained by a vertical synchronizing signal are added together by adder circuit 4 and applied to deflecting coil as the output of random-number generating circuit 3. Consequently, every time power switch S is turned ON, the count value of counter 5 is different, and a display position on the cathode-ray tube is therefore shifted, so that the printing of a fluorescent substance can be prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16275078A JPS5588135A (en) | 1978-12-27 | 1978-12-27 | Printing preventive unit for fluorescent substance on display cathode-ray tube screen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16275078A JPS5588135A (en) | 1978-12-27 | 1978-12-27 | Printing preventive unit for fluorescent substance on display cathode-ray tube screen |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5588135A true JPS5588135A (en) | 1980-07-03 |
Family
ID=15760540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16275078A Pending JPS5588135A (en) | 1978-12-27 | 1978-12-27 | Printing preventive unit for fluorescent substance on display cathode-ray tube screen |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5588135A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7496617B2 (en) | 2004-03-08 | 2009-02-24 | Siemens Aktiengesellschaft | Tamper proof generation of true random numbers |
-
1978
- 1978-12-27 JP JP16275078A patent/JPS5588135A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7496617B2 (en) | 2004-03-08 | 2009-02-24 | Siemens Aktiengesellschaft | Tamper proof generation of true random numbers |
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