GB1124306A - Improvements in or relating to circuit arrangements for correcting pin-cushion distortion in display tubes - Google Patents
Improvements in or relating to circuit arrangements for correcting pin-cushion distortion in display tubesInfo
- Publication number
- GB1124306A GB1124306A GB45480/65A GB4548065A GB1124306A GB 1124306 A GB1124306 A GB 1124306A GB 45480/65 A GB45480/65 A GB 45480/65A GB 4548065 A GB4548065 A GB 4548065A GB 1124306 A GB1124306 A GB 1124306A
- Authority
- GB
- United Kingdom
- Prior art keywords
- winding
- deflection coils
- phase
- correction
- vertical deflection
- 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.)
- Expired
Links
- 240000000136 Scabiosa atropurpurea Species 0.000 title abstract 2
- 238000004804 winding Methods 0.000 abstract 7
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000010363 phase shift Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
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
- H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/06—Acrylates
-
- 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
- H04N9/28—Arrangements for convergence or focusing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
1,124,306. Cathode - ray tube circuits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 27 Oct., 1965 [29 Oct., 1964; 12 Dec., 1964], No. 45480/65. Heading H4T. Pin-cushion distortion is corrected by modifying each orthogonal deflection sawtooth waveform in accordance with a parabolic function of the other. For correction in the East- West direction (assuming horizontal line scanning) a known arrangement is utilized which comprises a transductor 9 (Fig. 1) having a non-linear B/H characteristic and carrying a first (two-section) winding 11, 12 connected in shunt with the horizontal deflection coils 3 (fed from scanning generator 3) together with a second winding 16 connected to the vertical deflection circuit comprising generator 4 and deflection coils 7, 8. In operation, the inductance of the winding 11, 12 is varied as a parabolic (due to the transductor characteristic) function of the vertical frequency scanning current in winding 16 and the East-West correction then results from the effect of such variation in shunt with the horizontal deflection coils 3. This arrangement, however, is stated to be unsuitable for producing North-South correction since, owing to the essentially resistive nature of the internal impedance of the vertical deflection generator, the variable inductance (equivalent to winding 11, 12) must have a high value which, it is stated, gives rise to unwanted phase shifts. In accordance with the invention therefore, North-South correction is produced by utilizing the voltage of horizontal frequency induced in winding 16 (via winding 11, 12) such voltage, which is of incorrect phase, being substantially reversed in phase by capacitor 20 and coil 22 and then integrated by the vertical deflection coils 7, 8 so that the deflection current in the latter is suitably modified. The specification discusses the theory of operation of the arrangement and shows, inter alia, that the phase change produced by 20 and 22 cannot be exactly 180 degrees (since infinite values arise). In practice a phase change of about 170 degrees is produced. Other arrangements for producing the required phase shift include a secondary coil 28 coupled to the coil 22 and connected in parallel (Fig. 8, not shown) or in series (Fig. 9, not shown) with the vertical deflection coils and an arrangement similar to Fig. 1, but with the vertical deflection coils connected directly in series and the capacitor 20 in parallel therewith (Fig. 10, not shown).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP35388A DE1266798B (en) | 1964-10-29 | 1964-10-29 | Circuit arrangement for correcting the electron beam deflection of a television picture tube by means of a single transducer |
| DEP35679A DE1294450B (en) | 1964-10-29 | 1964-12-12 | Circuit arrangement for correcting the electron beam deflection of a television picture tube by means of a single transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1124306A true GB1124306A (en) | 1968-08-21 |
Family
ID=25990349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB45480/65A Expired GB1124306A (en) | 1964-10-29 | 1965-10-27 | Improvements in or relating to circuit arrangements for correcting pin-cushion distortion in display tubes |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US3444422A (en) |
| AT (1) | AT258369B (en) |
| BE (1) | BE671520A (en) |
| BR (1) | BR6574339D0 (en) |
| CH (1) | CH460855A (en) |
| DE (2) | DE1266798B (en) |
| DK (1) | DK119417B (en) |
| ES (1) | ES318963A1 (en) |
| FI (1) | FI42339B (en) |
| GB (1) | GB1124306A (en) |
| IL (1) | IL24521A (en) |
| NL (1) | NL140690B (en) |
| NO (1) | NO115964B (en) |
| OA (1) | OA01846A (en) |
| SE (1) | SE302985B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6908228A (en) * | 1969-05-29 | 1970-12-01 | ||
| US3716748A (en) * | 1969-07-24 | 1973-02-13 | Denki Onkyo Co Ltd | Saturable reactor for correcting raster distortion |
| US3622835A (en) * | 1969-12-10 | 1971-11-23 | Motorola Inc | Current-generating circuit |
| JPS4885029A (en) * | 1972-02-15 | 1973-11-12 | ||
| US3940662A (en) * | 1974-03-14 | 1976-02-24 | Whitewater Electronics, Inc. | Saturable reactor for pincushion distortion correction |
| US4654564A (en) * | 1984-11-30 | 1987-03-31 | Zenith Electronics Corporation | Saturable reactor with toroidal shunt paths |
| US4642530A (en) * | 1985-05-10 | 1987-02-10 | Rca Corporation | Raster distortion correction circuit |
| DE3729676A1 (en) * | 1987-09-04 | 1989-03-23 | Thomson Brandt Gmbh | CIRCUIT ARRANGEMENT FOR CORRECTING GEOMETRY DISTORTIONS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2906919A (en) * | 1955-12-27 | 1959-09-29 | Gen Electric | Deflection circuit |
| US3329862A (en) * | 1964-08-31 | 1967-07-04 | Rca Corp | Pincushion correction circuit having saturable reactor with asymmetrical parabolic waveform applied to the control winding |
| US3329859A (en) * | 1964-08-31 | 1967-07-04 | Rca Corp | Pincushion correction circuit having saturable reactor and means for adjusting the phase and magnitude of the horizontal component |
-
1964
- 1964-10-29 DE DEP35388A patent/DE1266798B/en not_active Withdrawn
- 1964-12-12 DE DEP35679A patent/DE1294450B/en active Pending
-
1965
- 1965-10-23 NL NL656513750A patent/NL140690B/en not_active IP Right Cessation
- 1965-10-26 SE SE13845/65A patent/SE302985B/xx unknown
- 1965-10-26 CH CH1473765A patent/CH460855A/en unknown
- 1965-10-26 AT AT968365A patent/AT258369B/en active
- 1965-10-26 OA OA52229A patent/OA01846A/en unknown
- 1965-10-26 IL IL24521A patent/IL24521A/en unknown
- 1965-10-26 NO NO160215A patent/NO115964B/no unknown
- 1965-10-26 DK DK549365AA patent/DK119417B/en unknown
- 1965-10-26 BR BR174339/65A patent/BR6574339D0/en unknown
- 1965-10-26 FI FI2556/65A patent/FI42339B/fi active
- 1965-10-27 GB GB45480/65A patent/GB1124306A/en not_active Expired
- 1965-10-27 ES ES0318963A patent/ES318963A1/en not_active Expired
- 1965-10-27 BE BE671520D patent/BE671520A/xx unknown
- 1965-10-28 US US505540A patent/US3444422A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| SE302985B (en) | 1968-08-12 |
| ES318963A1 (en) | 1967-01-01 |
| DE1294450B (en) | 1969-05-08 |
| DE1266798B (en) | 1968-04-25 |
| BE671520A (en) | 1966-04-27 |
| BR6574339D0 (en) | 1973-12-18 |
| OA01846A (en) | 1970-01-14 |
| CH460855A (en) | 1968-08-15 |
| AT258369B (en) | 1967-11-27 |
| FI42339B (en) | 1970-03-31 |
| NL140690B (en) | 1973-12-17 |
| IL24521A (en) | 1969-11-12 |
| NL6513750A (en) | 1966-05-02 |
| DK119417B (en) | 1970-12-28 |
| NO115964B (en) | 1969-01-06 |
| US3444422A (en) | 1969-05-13 |
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