ES2076309T3 - Circuito de control de un haz de tubo de rayos catodicos. - Google Patents
Circuito de control de un haz de tubo de rayos catodicos.Info
- Publication number
- ES2076309T3 ES2076309T3 ES90304128T ES90304128T ES2076309T3 ES 2076309 T3 ES2076309 T3 ES 2076309T3 ES 90304128 T ES90304128 T ES 90304128T ES 90304128 T ES90304128 T ES 90304128T ES 2076309 T3 ES2076309 T3 ES 2076309T3
- Authority
- ES
- Spain
- Prior art keywords
- rate
- responsive
- control signal
- excursion
- signal
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/59—Control of contrast or brightness in dependence upon beam current of cathode ray tube
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/141—Beam current control means
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Details Of Television Scanning (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
ESTE INVENTO SE REFIERE GENERALMENTE AL CAMPO DE LOS CIRCUITOS PARA CONTROLAR LAS CORRIENTES DE HAZ CONDUCIDAS EN TUBOS DE RAYOS CATODICOS EN RECEPTORES DE TELEVISION, CON USO IMPORTANTE PARA IMPEDIR EL FALSO ENCUADRADO O LA VESICULACION DE LA MASCARA DE SOMBRA USADA EN CONJUNCION CON LOS TUBOS DE RAYOS CATODICOS PARA RECEPTORES DE TELEVISION DE COLOR, DEBIDO AL CALENTAMIENTO DESDE CORRIENTES DE HAZ DE PICO INTENSAS Y LOCALIZADAS. UN CIRCUITO ANTI-VESICULACION COMPRENDE UN PRIMER DETECTOR (Q1,R1,R2,R3) PARA DETECTAR LAS EXCURSIONES DE AMPLITUD DE UNA SEÑAL CON INFORMACION DE LUMINANCIA MAS ALLA DE UN UMBRAL DE NIVEL BLANCO DURANTE CADA BARRIDO HORIZONTAL. ESTO PERMITE AL CURCUITO SER MAS SENSIBLE RESPONDIENDO A EXCURSIONES QUE SE PRODUCEN DURANTE CADA LINEA DE BARRIDO HORIZONTAL. UN PRIMER SINCRONIZADOR (C1,R5), QUE RESPONDE AL PRIMER DETECTOR, PROPORCIONA UNA PRIMERA SEÑAL DE CONTROL RELACIONADA CON UNA DURACION MINIMA DE CADA EXCURSION DE AMPLITUD DE LA SEÑAL MAS ALLA DEL UMBRAL. ESTO PERMITE AL CIRCUITO EVITAR CONTROLAR LA CORRIENTE DE HAZ, POR EJEMPLO MEDIANTE LA REDUCCION DEL CONTRASTE, QUE RESPONDE A CORRIENTES DE PICO DE SEÑAL QUE SON DEMASIADO CORTAS PARA PRODUCIR VESICULACION O FALSO ENCUADRE. FINALMENTE, UN CONMUTADOR (Q2) Y UN SEGUNDO SINCRONIZADOR (C2,R6), QUE RESPONDEN A LA PRIMERA SEÑAL DE CONTROL, PROPORCIONAN UNA SEGUNDA SEÑAL DE CONTROL QUE CAE EN UN PRIMER INDICE PARA REDUCIR LA CORRIENTE DE HAZ, POR EJEMPLO MEDIANTE LA REDUCCION DE CONTRASTE, DURANTE CADA EXCURSION DE AMPLITUD DE DURACION MINIMA; Y LA CUAL SE ELEVA A UN SEGUNDO INDICE PARA PERMITIR A LA CORRIENTE DE HAZ QUE SE INCREMENTE DESPUES DE LA TERMINACION DE LA EXCURSION DE AMPLITUD, HASTA LA SIGUIENTE EXCURSION DE DURACION MINIMA. LA CONSTANTE DE TIEMPO PARA EL SEGUNDO INDICE ES MUCHO MAYOR QUE LA CONSTANTE DE TIEMPO DEL PRIMER INDICE.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US34065289A | 1989-04-20 | 1989-04-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2076309T3 true ES2076309T3 (es) | 1995-11-01 |
Family
ID=23334368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES90304128T Expired - Lifetime ES2076309T3 (es) | 1989-04-20 | 1990-04-18 | Circuito de control de un haz de tubo de rayos catodicos. |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0394003B1 (es) |
JP (1) | JP3049506B2 (es) |
KR (1) | KR100188238B1 (es) |
AT (1) | ATE126957T1 (es) |
CA (1) | CA2013928C (es) |
DE (1) | DE69021764T2 (es) |
ES (1) | ES2076309T3 (es) |
FI (1) | FI97667C (es) |
MY (1) | MY105525A (es) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19818387A1 (de) * | 1997-10-20 | 1999-04-22 | Thomson Brandt Gmbh | Verfahren zum Regeln der Bildleistung bei einem Fernsehempfänger |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5230821Y2 (es) * | 1973-02-28 | 1977-07-14 | ||
US4689668A (en) * | 1986-07-14 | 1987-08-25 | Rca Corporation | Auxiliary kinescope beam current limiter with plural cascaded low pass filter and peak detector stages |
-
1990
- 1990-04-04 MY MYPI90000536A patent/MY105525A/en unknown
- 1990-04-05 CA CA002013928A patent/CA2013928C/en not_active Expired - Fee Related
- 1990-04-12 FI FI901858A patent/FI97667C/fi not_active IP Right Cessation
- 1990-04-17 KR KR1019900005305A patent/KR100188238B1/ko not_active IP Right Cessation
- 1990-04-18 DE DE69021764T patent/DE69021764T2/de not_active Expired - Lifetime
- 1990-04-18 ES ES90304128T patent/ES2076309T3/es not_active Expired - Lifetime
- 1990-04-18 EP EP90304128A patent/EP0394003B1/en not_active Expired - Lifetime
- 1990-04-18 AT AT90304128T patent/ATE126957T1/de not_active IP Right Cessation
- 1990-04-19 JP JP2101891A patent/JP3049506B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0394003A2 (en) | 1990-10-24 |
CA2013928C (en) | 2002-06-18 |
DE69021764D1 (de) | 1995-09-28 |
FI97667C (fi) | 1997-01-27 |
FI97667B (fi) | 1996-10-15 |
EP0394003B1 (en) | 1995-08-23 |
JP3049506B2 (ja) | 2000-06-05 |
CA2013928A1 (en) | 1990-10-20 |
FI901858A0 (fi) | 1990-04-12 |
EP0394003A3 (en) | 1990-12-19 |
KR900017367A (ko) | 1990-11-16 |
ATE126957T1 (de) | 1995-09-15 |
JPH02295388A (ja) | 1990-12-06 |
KR100188238B1 (ko) | 1999-06-01 |
MY105525A (en) | 1994-10-31 |
DE69021764T2 (de) | 1996-04-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FG2A | Definitive protection |
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