GB1459922A

GB1459922A – Television line-output circuit
– Google Patents

GB1459922A – Television line-output circuit
– Google Patents
Television line-output circuit

Info

Publication number
GB1459922A

GB1459922A
GB94174A
GB94174A
GB1459922A
GB 1459922 A
GB1459922 A
GB 1459922A
GB 94174 A
GB94174 A
GB 94174A
GB 94174 A
GB94174 A
GB 94174A
GB 1459922 A
GB1459922 A
GB 1459922A
Authority
GB
United Kingdom
Prior art keywords
voltage
line
correction
frequency
east
Prior art date
1973-02-01
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.)

Expired

Application number
GB94174A
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.)

Philips Electronics UK Ltd

Original Assignee
Philips Electronic and Associated Industries 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.)
1973-02-01
Filing date
1974-01-09
Publication date
1976-12-31

1974-01-09
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd

1976-12-31
Publication of GB1459922A
publication
Critical
patent/GB1459922A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen

H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction

H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements

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

H04N3/18—Generation of supply voltages, in combination with electron beam deflecting

Abstract

1459922 EHT supply for TV systems PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 9 Jan 1974 [1 Feb 1973] 00941/74 Heading H2F [Also in Division H4] In a (colour) television system in which the line deflection is amplitude modulated by a (parabolic) function of the field frequency (to compensate for EAST-WEST raster distortion) and/or by some other control function (e.g. to compensate for the effect of supply voltage variations), a first sawtooth wave generator supplies a portion of the line deflection current and a second sawtooth wave generator supplies a further portion which is EAST-WEST correction modulated, both generators, which are fed from the same supply voltage source and are controlled by the same line frequency switch, having the same retrace time and being so arranged that modulation of the line fly-back pulses by the field frequency (or other control function) is prevented. Thus E.H.T. and other supply voltage derived from the fly-back pulses are free from such modulation. Fig. 1, shows one embodiment in which the first sawtooth generator comprises the line deflection coils LY, trace and retrace capacitors C t and C r respectively together with diode D whilst the second sawtooth generator comprises inductance L1, trace and retrace capacitors C1 t and C1 r respectively together with diode D1, both generators being controlled by transistor switch Tr rendered conducting near the middle of the trace time and supplied from (mains derived) voltage source B via the primary L1 of the line output transformer. To compensate for EAST-WEST raster distortion a modulation circuit M1 comprising a driver circuit Dr1 supplied with a field-frequency input controls a transistor Tr1 to produce a parabolically varying load across capacitor C1 t which varies the voltage V1 across this capacitor and likewise the voltage V across capacitor C t and therefore the deflection current i y in similar manner. The voltage VA at point A is equal to the sum of the voltages across C r and C r 1 and the peak value of VA relative to its mean value (the voltage VB) bears the same relationship as the retrace voltage across C r , C,1 relative to voltages V and V1. If VB is constant the peak value VA is also constant so that the amplitude of the voltage across L1 is also constant. Thus voltages derived from windings such as L2 (the EHT voltage) are not field frequency modulated. If VB is not constant the resulting variations in V + V1 or in the peak voltage of VA may form the input to a stabilization circuit S (Fig. 2) connected to a third sawtooth generator D11, C11 r , C11 t and L11 (similar to the other two sawtooth generators) to produce a compensating variation across inductance L3. In a further arrangement compensation may be effected by controlling the conduction time of transistor Tr (Fig. 3) by means of a comparison stage in driver Dr which compares the peak rectified voltage across L5 with the voltage at the junction of L y and C t such voltage being supplied to the comparison stage via a low-pass-filter F which removes line frequency components and passes any field frequency component. When the line deflection coil is in two equal portions L y1 , L y2 (Fig. 4a) anisotropic astigmatic deflection errors may be corrected by means of a modulation source M2 which so varies the voltage across capacitor C 12 that a correction difference current i t flows in opposite directions in coil portions L y1 , L y2 to produce, in some manner, a quadripolar correction field, the EAST-WEST correction being effected, as in the other embodiments, by means of the modulation source M1. Because a D.C. component of correction current flows through coil portion L y2 but not through portion L y1 , errors may arise and these may be eliminated by connecting the modulation source M2 through a choke L6 (Fig. 4b) which passes field frequency but blocks line frequency. An arrangement for generating a NORTHSOUTH correction is described with reference to Fig. 5 (not shown) and an arrangement in which the “S” correction (provided by capacitor C t ) is more EAST-WEST modulated than the deflection current itself (to improve linearity) is described with reference to Fig. 6 (not shown). When the impedance for line frequency of the inductor between point A and the positive terminal of source B is reduced by the presence of parasitic capacitances the resonant frequencies and consequently the retrace times of the individual sawtooth generators may not be identical and to compensate for this an inductive potential divider including a tap on such impedance may be employed (Fig. 7, not shown).

GB94174A
1973-02-01
1974-01-09
Television line-output circuit

Expired

GB1459922A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

NL737301421A

NL152733B
(en)

1973-02-01
1973-02-01

SWITCHING DEVICE FOR AN IMAGE DISPLAY TUBE PROVIDED FOR AN IMAGE DISPLAY DEVICE FOR GENERATING A SAW-TOOTH DEFLECTION CURRENT BY A CONTROL DEVICE COIL, AS WELL AS A IMAGE DISPLAY DEVICE PROVIDED WITH SUCH CIRCUIT.

Publications (1)

Publication Number
Publication Date

GB1459922A
true

GB1459922A
(en)

1976-12-31

Family
ID=19818125
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB94174A
Expired

GB1459922A
(en)

1973-02-01
1974-01-09
Television line-output circuit

Country Status (19)

Country
Link

US
(1)

US3906305A
(en)

JP
(2)

JPS5739102B2
(en)

AR
(1)

AR202547A1
(en)

AT
(1)

AT333353B
(en)

BE
(1)

BE810393A
(en)

BR
(1)

BR7400651D0
(en)

CA
(1)

CA1009742A
(en)

CH
(1)

CH567348A5
(en)

DK
(1)

DK142520B
(en)

ES
(1)

ES422754A1
(en)

FI
(1)

FI61592C
(en)

FR
(1)

FR2216722B1
(en)

GB
(1)

GB1459922A
(en)

IT
(1)

IT1007148B
(en)

NL
(1)

NL152733B
(en)

NO
(1)

NO144555C
(en)

SE
(1)

SE394566B
(en)

YU
(1)

YU35944B
(en)

ZA
(1)

ZA74148B
(en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

NL152733B
(en)

*

1973-02-01
1977-03-15
Philips Nv

SWITCHING DEVICE FOR AN IMAGE DISPLAY TUBE PROVIDED FOR AN IMAGE DISPLAY DEVICE FOR GENERATING A SAW-TOOTH DEFLECTION CURRENT BY A CONTROL DEVICE COIL, AS WELL AS A IMAGE DISPLAY DEVICE PROVIDED WITH SUCH CIRCUIT.

GB1449375A
(en)

*

1974-05-13
1976-09-15
Mullard Ltd
Television field deflection circuits

NL7411046A
(en)

*

1974-08-19
1976-02-23
Philips Nv

CIRCUIT IN AN IMAGE DISPLAY DEVICE FOR THE (HORIZONTAL) LINE BENDING.

GB1530661A
(en)

*

1976-01-16
1978-11-01
Philips Nv
Line sawtooth current generators

IT1063185B
(en)

*

1976-06-05
1985-02-11
Indesit
Sawtooth current generator for TV – has energy stored in coil transferred to parallel resonant circuit during flyback period (NL 19.12.77)

IT1072048B
(en)

*

1976-11-26
1985-04-10
Indesit

CIRCUIT TO OBTAIN A SAW TOOTH CURRENT IN A COIL

IT1082972B
(en)

*

1977-04-06
1985-05-21
Indesit

CIRCUIT TO OBTAIN A SAW TOOTH CURRENT IN A COIL

JPS5419324A
(en)

*

1977-07-14
1979-02-14
Sony Corp
Current control circuit

GB1600367A
(en)

*

1977-07-25
1981-10-14
Rca Corp
Pincushion correction circuit

US4132908A
(en)

*

1977-08-04
1979-01-02
Smiths Industries, Inc.
Digital-to-analog conversion with deglitch

JPS54127217A
(en)

*

1978-03-27
1979-10-03
Sony Corp
Load driver circuit

US4254365A
(en)

*

1979-10-01
1981-03-03
Rca Corporation
Side pincushion correction modulator circuit

US4329729A
(en)

*

1980-06-23
1982-05-11
Rca Corporation
Side pincushion modulator circuit with overstress protection

JPS5830279A
(en)

*

1981-08-18
1983-02-22
Matsushita Electric Ind Co Ltd
Correcting device for picture distortion

GB2193407A
(en)

*

1986-07-18
1988-02-03
Philips Electronic Associated
Television line output circuit

JPH0683383B2
(en)

*

1987-06-10
1994-10-19
株式会社日立製作所

Horizontal deflection / high voltage circuit

JP2519732B2
(en)

*

1987-07-13
1996-07-31
株式会社東芝

Horizontal output circuit

JPH0828827B2
(en)

*

1988-09-26
1996-03-21
株式会社東芝

Horizontal output circuit

US5162705A
(en)

*

1991-11-27
1992-11-10
North American Philips Corporation
Dynamic focussing circuit for cathode ray tube and transformer for use therein

US5146142A
(en)

*

1992-01-28
1992-09-08
North American Philips Corporation
Dynamic focussing signal power amplifier for magnetically focussed raster scan cathode ray tube

JP3558690B2
(en)

*

1994-08-01
2004-08-25
株式会社東芝

Horizontal output circuit

KR0177105B1
(en)

*

1995-12-18
1999-05-01
김광호
Horizontal drive circuit

US6614193B2
(en)

2001-08-31
2003-09-02
Thomson Licensing S.A.
Deflection current modulation circuit

US7064501B2
(en)

*

2003-02-02
2006-06-20
Jozef Johannes Maria Hulshof
Sawtooth line circuit for a cathode ray tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3444426A
(en)

*

1967-12-29
1969-05-13
Motorola Inc
Horizontal sweep system with automatic raster size regulation

NL6902807A
(en)

*

1969-02-21
1970-08-25

NL152733B
(en)

*

1973-02-01
1977-03-15
Philips Nv

SWITCHING DEVICE FOR AN IMAGE DISPLAY TUBE PROVIDED FOR AN IMAGE DISPLAY DEVICE FOR GENERATING A SAW-TOOTH DEFLECTION CURRENT BY A CONTROL DEVICE COIL, AS WELL AS A IMAGE DISPLAY DEVICE PROVIDED WITH SUCH CIRCUIT.

1973

1973-02-01
NL
NL737301421A
patent/NL152733B/en
not_active
IP Right Cessation

1974

1974-01-08
ZA
ZA00740148A
patent/ZA74148B/en
unknown

1974-01-09
GB
GB94174A
patent/GB1459922A/en
not_active
Expired

1974-01-22
US
US435533A
patent/US3906305A/en
not_active
Expired – Lifetime

1974-01-28
CA
CA191,075A
patent/CA1009742A/en
not_active
Expired

1974-01-29
AT
AT69374*#A
patent/AT333353B/en
not_active
IP Right Cessation

1974-01-29
SE
SE7401090A
patent/SE394566B/en
not_active
IP Right Cessation

1974-01-29
CH
CH120974A
patent/CH567348A5/xx
not_active
IP Right Cessation

1974-01-29
DK
DK46274AA
patent/DK142520B/en
not_active
IP Right Cessation

1974-01-29
FR
FR7402878A
patent/FR2216722B1/fr
not_active
Expired

1974-01-29
FI
FI237/74A
patent/FI61592C/en
active

1974-01-29
NO
NO740279A
patent/NO144555C/en
unknown

1974-01-29
IT
IT19930/74A
patent/IT1007148B/en
active

1974-01-30
BR
BR651/74A
patent/BR7400651D0/en
unknown

1974-01-30
BE
BE140373A
patent/BE810393A/en
not_active
IP Right Cessation

1974-01-30
AR
AR252129A
patent/AR202547A1/en
active

1974-01-30
ES
ES422754A
patent/ES422754A1/en
not_active
Expired

1974-02-01
YU
YU246/74A
patent/YU35944B/en
unknown

1974-02-01
JP
JP1359474A
patent/JPS5739102B2/ja
not_active
Expired

1981

1981-09-30
JP
JP56154031A
patent/JPS5795763A/en
active
Granted

Also Published As

Publication number
Publication date

US3906305A
(en)

1975-09-16

DK142520B
(en)

1980-11-10

JPS5739102B2
(en)

1982-08-19

ZA74148B
(en)

1975-08-27

DE2403331A1
(en)

1974-08-22

NO740279L
(en)

1974-08-02

CH567348A5
(en)

1975-09-30

JPS5795763A
(en)

1982-06-14

FI61592C
(en)

1982-08-10

AT333353B
(en)

1976-11-25

FI61592B
(en)

1982-04-30

FR2216722B1
(en)

1976-11-26

BE810393A
(en)

1974-07-30

AR202547A1
(en)

1975-06-24

AU6492074A
(en)

1975-07-31

NL152733B
(en)

1977-03-15

NO144555B
(en)

1981-06-09

NO144555C
(en)

1981-09-16

FR2216722A1
(en)

1974-08-30

SE394566B
(en)

1977-06-27

ATA69374A
(en)

1976-03-15

YU24674A
(en)

1980-12-31

ES422754A1
(en)

1976-04-16

DE2403331B2
(en)

1976-08-12

IT1007148B
(en)

1976-10-30

JPH0228947B2
(en)

1990-06-27

NL7301421A
(en)

1974-08-05

BR7400651D0
(en)

1974-09-10

JPS49111542A
(en)

1974-10-24

DK142520C
(en)

1981-03-30

YU35944B
(en)

1981-08-31

CA1009742A
(en)

1977-05-03

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Legal Events

Date
Code
Title
Description

1977-05-11
PS
Patent sealed [section 19, patents act 1949]

1994-02-09
PE20
Patent expired after termination of 20 years

Effective date:
19940108

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