FR2410926A1 - Electronic video TV game - uses small variation of image position to prevent permanent marking of screen - Google Patents

Electronic video TV game - uses small variation of image position to prevent permanent marking of screen

Info

Publication number
FR2410926A1
FR2410926A1 FR7736341A FR7736341A FR2410926A1 FR 2410926 A1 FR2410926 A1 FR 2410926A1 FR 7736341 A FR7736341 A FR 7736341A FR 7736341 A FR7736341 A FR 7736341A FR 2410926 A1 FR2410926 A1 FR 2410926A1
Authority
FR
France
Prior art keywords
screen
circuit
electronic video
permanent marking
game
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
FR7736341A
Other languages
French (fr)
Other versions
FR2410926B1 (en
Inventor
Jean-Pierre Asmus
Joseph Soto
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.)
Radiotechnique SA
Original Assignee
Radiotechnique SA
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 Radiotechnique SA filed Critical Radiotechnique SA
Priority to FR7736341A priority Critical patent/FR2410926A1/en
Publication of FR2410926A1 publication Critical patent/FR2410926A1/en
Application granted granted Critical
Publication of FR2410926B1 publication Critical patent/FR2410926B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The electronic video game circuit prevents permanent marking of the screen when a highly contrasted picture is held on the screen for a considerable time. The synchronisation signal generator of the circuit has a control terminal allowing variation of the recurrent frequency, connected to the output of a wobbulator circuit operating at very low frequency. The wobbulator circuit (7) comprises two operational amplifiers (8, 21) connected to square and triangular signal generators respectively. The variation over a period of several seconds causes a small slow displacement of the image on the screen, preventing the electron beam permanently damaging the particular points.
FR7736341A 1977-12-02 1977-12-02 Electronic video TV game - uses small variation of image position to prevent permanent marking of screen Granted FR2410926A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7736341A FR2410926A1 (en) 1977-12-02 1977-12-02 Electronic video TV game - uses small variation of image position to prevent permanent marking of screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7736341A FR2410926A1 (en) 1977-12-02 1977-12-02 Electronic video TV game - uses small variation of image position to prevent permanent marking of screen

Publications (2)

Publication Number Publication Date
FR2410926A1 true FR2410926A1 (en) 1979-06-29
FR2410926B1 FR2410926B1 (en) 1980-08-22

Family

ID=9198382

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7736341A Granted FR2410926A1 (en) 1977-12-02 1977-12-02 Electronic video TV game - uses small variation of image position to prevent permanent marking of screen

Country Status (1)

Country Link
FR (1) FR2410926A1 (en)

Also Published As

Publication number Publication date
FR2410926B1 (en) 1980-08-22

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Legal Events

Date Code Title Description
ST Notification of lapse