WO1997008718A3 - Disconnectable degaussing - Google Patents

Disconnectable degaussing Download PDF

Info

Publication number
WO1997008718A3
WO1997008718A3 PCT/IB1996/000821 IB9600821W WO9708718A3 WO 1997008718 A3 WO1997008718 A3 WO 1997008718A3 IB 9600821 W IB9600821 W IB 9600821W WO 9708718 A3 WO9708718 A3 WO 9708718A3
Authority
WO
WIPO (PCT)
Prior art keywords
degaussing
triac
current
determining
switching
Prior art date
Application number
PCT/IB1996/000821
Other languages
French (fr)
Other versions
WO1997008718A2 (en
Inventor
Tony Andre Roger Hollevoet
Original Assignee
Philips Electronics Nv
Philips Norden Ab
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 Philips Electronics Nv, Philips Norden Ab filed Critical Philips Electronics Nv
Publication of WO1997008718A2 publication Critical patent/WO1997008718A2/en
Publication of WO1997008718A3 publication Critical patent/WO1997008718A3/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

Degaussing arrangement provided with a series circuit of a degaussing coil (Ld), a current-determining circuit (P1, P2) for determining a starting current through the degaussing coil (Ld) and for subsequently causing the current (Id) through the degaussing coil (Ld) to decrease to a residual value, and a triac (S) for switching off the current (Id) through the degaussing coil (Ld) and through the current-determining circuit. The degaussing arrangement is further provided with a control circuit (200) for switching on and switching off the triac (S), and with a time-determining circuit (C38; C3; 30) for determining a period of time. After the triac (S) is switched on, the triac (S) is not switched off until after the period of time has elapsed. Extra facilities have been provided to control the triac (S) as optimally as possible and to render the degaussing arrangement insensitive to mains interruptions and display tube flashes.
PCT/IB1996/000821 1995-08-23 1996-08-21 Disconnectable degaussing WO1997008718A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP95202273 1995-08-23
EP95202273.9 1995-08-23

Publications (2)

Publication Number Publication Date
WO1997008718A2 WO1997008718A2 (en) 1997-03-06
WO1997008718A3 true WO1997008718A3 (en) 1997-03-27

Family

ID=8220581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/000821 WO1997008718A2 (en) 1995-08-23 1996-08-21 Disconnectable degaussing

Country Status (2)

Country Link
KR (1) KR970707562A (en)
WO (1) WO1997008718A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004004216A1 (en) * 2004-01-27 2005-08-25 Deutsche Thomson-Brandt Gmbh Circuit arrangement for demagnetizing a picture tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733524A (en) * 1972-03-01 1973-05-15 Singer Co Degaussing circuit
US4489253A (en) * 1982-11-01 1984-12-18 Zenith Electronics Corporation Automatic degaussing circuit with switch mode power supply
DE3418076A1 (en) * 1984-05-16 1985-11-21 Loewe Opta Gmbh, 8640 Kronach Circuit arrangement for the automatic demagnetisation of the tube in a colour-television receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733524A (en) * 1972-03-01 1973-05-15 Singer Co Degaussing circuit
US4489253A (en) * 1982-11-01 1984-12-18 Zenith Electronics Corporation Automatic degaussing circuit with switch mode power supply
DE3418076A1 (en) * 1984-05-16 1985-11-21 Loewe Opta Gmbh, 8640 Kronach Circuit arrangement for the automatic demagnetisation of the tube in a colour-television receiver

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 18, No. 234, E-1543; & JP,A,06 022 245, (MATSUSHITA ELECTRIC IND CO LTD), 28 January 1994. *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 99, E-243; & JP,A,59 016 486, (MITSUBISHI DENKI K.K.), 27 January 1984. *

Also Published As

Publication number Publication date
KR970707562A (en) 1997-12-01
WO1997008718A2 (en) 1997-03-06

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