FR2321767A1 - CRT dynamic focussing circuit - has clamping circuit holding parabolic signal sum at centre of picture voltage - Google Patents

CRT dynamic focussing circuit - has clamping circuit holding parabolic signal sum at centre of picture voltage

Info

Publication number
FR2321767A1
FR2321767A1 FR7624962A FR7624962A FR2321767A1 FR 2321767 A1 FR2321767 A1 FR 2321767A1 FR 7624962 A FR7624962 A FR 7624962A FR 7624962 A FR7624962 A FR 7624962A FR 2321767 A1 FR2321767 A1 FR 2321767A1
Authority
FR
France
Prior art keywords
circuit
centre
clamping circuit
dynamic focussing
crt
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
FR7624962A
Other languages
French (fr)
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of FR2321767A1 publication Critical patent/FR2321767A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • 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
    • H04N3/26—Modifications of scanning arrangements to improve focusing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

The dynamic focussing circuit, for a c.p.t. retains sharp dynamic focussing throughout adjustment of static focus. The parabolic signals are passed to an adder (R1, R2). A clamping circuit (D1 D2, R2) is connected after the adder and clamps the voltage of the sum signal to a level corresponding to the potential at the centre of the picture. The clamping circuit consists of the series combination of two oppositely-poled diodes between the sum signal input and a reference potential. A special mu-metal coil (FD) for dynamic focussing is coupled through two up. amps. to the output of the clamping circuit.
FR7624962A 1975-08-18 1976-08-17 CRT dynamic focussing circuit - has clamping circuit holding parabolic signal sum at centre of picture voltage Pending FR2321767A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752536752 DE2536752C3 (en) 1975-08-18 1975-08-18 Coil arrangement for dynamic and static focusing of the electron beam from image pick-up or display tubes

Publications (1)

Publication Number Publication Date
FR2321767A1 true FR2321767A1 (en) 1977-03-18

Family

ID=5954240

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7624962A Pending FR2321767A1 (en) 1975-08-18 1976-08-17 CRT dynamic focussing circuit - has clamping circuit holding parabolic signal sum at centre of picture voltage

Country Status (2)

Country Link
DE (1) DE2536752C3 (en)
FR (1) FR2321767A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403641A1 (en) * 1977-09-16 1979-04-13 Victor Company Of Japan DEVICE FOR STABILIZING THE FOCUSING OF THE ELECTRON BEAM OF AN ELECTROMAGNETIC FOCUSING TYPE TUBE
FR2728419A1 (en) * 1994-12-09 1996-06-21 Matsushita Electric Ind Co Ltd ELECTROMAGNETIC FOCUSING CIRCUIT FOR CATHODE RAY TUBE

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021073A (en) * 1956-05-14 1962-02-13 Itt Dynamic focusing
DE1175267B (en) * 1961-05-19 1964-08-06 Fernseh Gmbh Coil system for image splitting tubes with a storage electrode
DE1764855A1 (en) * 1963-10-19 1971-03-04 Fernseh Gmbh Device with a control circuit for generating a refocusing current
US3796913A (en) * 1973-02-28 1974-03-12 Seaco Computer Display Inc Dynamic focus waveform generators
US3961223A (en) * 1975-03-04 1976-06-01 United Technologies Corporation Astigmatic focus correction circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021073A (en) * 1956-05-14 1962-02-13 Itt Dynamic focusing
DE1175267B (en) * 1961-05-19 1964-08-06 Fernseh Gmbh Coil system for image splitting tubes with a storage electrode
DE1764855A1 (en) * 1963-10-19 1971-03-04 Fernseh Gmbh Device with a control circuit for generating a refocusing current
US3796913A (en) * 1973-02-28 1974-03-12 Seaco Computer Display Inc Dynamic focus waveform generators
US3961223A (en) * 1975-03-04 1976-06-01 United Technologies Corporation Astigmatic focus correction circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403641A1 (en) * 1977-09-16 1979-04-13 Victor Company Of Japan DEVICE FOR STABILIZING THE FOCUSING OF THE ELECTRON BEAM OF AN ELECTROMAGNETIC FOCUSING TYPE TUBE
FR2728419A1 (en) * 1994-12-09 1996-06-21 Matsushita Electric Ind Co Ltd ELECTROMAGNETIC FOCUSING CIRCUIT FOR CATHODE RAY TUBE
US5747949A (en) * 1994-12-09 1998-05-05 Matsushita Electric Industrial Co., Ltd. CRT focusing circuit with individually controlled switches developing an approximate parabolic waveform

Also Published As

Publication number Publication date
DE2536752C3 (en) 1978-06-22
DE2536752A1 (en) 1977-02-24
DE2536752B2 (en) 1977-11-03

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