FI67005B - Stroemkrets foer begraensning av en i ett bildroer stroemmandestraolstroem - Google Patents
Stroemkrets foer begraensning av en i ett bildroer stroemmandestraolstroem Download PDFInfo
- Publication number
- FI67005B FI67005B FI790353A FI790353A FI67005B FI 67005 B FI67005 B FI 67005B FI 790353 A FI790353 A FI 790353A FI 790353 A FI790353 A FI 790353A FI 67005 B FI67005 B FI 67005B
- Authority
- FI
- Finland
- Prior art keywords
- current
- control signal
- circuit
- threshold
- pass filter
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 description 17
- 230000008859 change Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 10
- 238000012935 Averaging Methods 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 5
- 230000001052 transient effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Details Of Television Scanning (AREA)
- Picture Signal Circuits (AREA)
- Processing Of Color Television Signals (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Claims (7)
1. Krets för begränsning av en i ett bildrör strömmande strälström, vilken krets omfattar en styrsignalsgenerator, omfattan-de ett lägpassfilter och vilken matar en styrsignal, som indikerar nivän av variationerna hos bildrörets strälström, för begränsning av strälströmmen att strömma i bildröret endast dä strälströmmen överstiger ett första tröskelvärde som bestämmes av ett i en lägpassfilterkrets liggande tröskelorgan, varvid filterkretsen, under det första tröskelvärdet, befinner sig i ett första tillständ och tröskelorganet avbryter styrsignalens matning, och läg-passfilterkretsen ovanför ett första tröskelvärde, befinner sig i ett andra tillständ, där den har en rätt liten bandbbedd, varvid styrsignalen följer strälströmmens relativt längvariga varia-tioner, kännetecknad därav, att lägpassfilterkretsen (73-77) anordnats för koppling mellan tre tillständ under päverkan av strälströmmens styrning och i ett tredje tillständ, tili vil-ket den kopplas när strälströmmen Överskrider pä förhand bestämda förhöjda värden, är dess bandbredd väsentligen större än i det andra tillständet och därtill följer styrsignalen relativt kort-variga variationer hos strälströmmen.
2. Krets enligt patentkravet 1,kännetecknad därav, att lägpassfilterkretsens (73-77) tidkonstant mellan det andra och tredje tillständet, anordnats att varieras med hjälp av ett tilläggströskelelement ( 77 ) , vilket uppvisar ett första och ett andra ledningstillständ i samband med en överstor strälström, vilken strälström pä motsvarande sätt uppvisar relativt läng-och kortvariga variationer.
3. Krets enligt patentkravet 2,kännetecknad därav, att tilläggströskelelement (77) , dä det befinner sig i sitt andra ledningstillständ, vilket motsvarar relativt kortvariga ! variationer, avkopplar kondensatorn (75) frän filterkretsen (73-77).
4. Krets enligt patentkravet 2, kännetecknad därav, att styrsignalsgeneratorn (70-78) kopplats tili en ström-källa (ström Ig), vilken matar Ström, som indikerar strälströmmens nivä för avkänning av matningsströmmen och för alstring av styrsignalen när matningsströmmen överskrider ett första tröskel-
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87623878 | 1978-02-09 | ||
| US05/876,238 US4167025A (en) | 1978-02-09 | 1978-02-09 | Automatic peak beam current limiter |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| FI790353A FI790353A (fi) | 1979-08-10 |
| FI67005B true FI67005B (fi) | 1984-08-31 |
| FI67005C FI67005C (fi) | 1984-12-10 |
Family
ID=25367248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI790353A FI67005C (fi) | 1978-02-09 | 1979-02-02 | Stroemkrets foer begraensning av en i ett bildroer stroemmandestraolstroem |
Country Status (24)
| Country | Link |
|---|---|
| US (1) | US4167025A (sv) |
| JP (1) | JPS5829033B2 (sv) |
| AT (1) | AT382747B (sv) |
| AU (1) | AU530947B2 (sv) |
| BE (1) | BE873948A (sv) |
| CA (1) | CA1127291A (sv) |
| CS (1) | CS252803B2 (sv) |
| DD (1) | DD141964A5 (sv) |
| DE (1) | DE2905005C2 (sv) |
| DK (1) | DK148110C (sv) |
| ES (1) | ES477608A1 (sv) |
| FI (1) | FI67005C (sv) |
| FR (1) | FR2417225A1 (sv) |
| GB (1) | GB2014409B (sv) |
| HK (1) | HK16487A (sv) |
| IT (1) | IT1111785B (sv) |
| MX (1) | MX4381E (sv) |
| MY (1) | MY8500714A (sv) |
| NL (1) | NL7901015A (sv) |
| NZ (1) | NZ189587A (sv) |
| PL (1) | PL119550B1 (sv) |
| SE (1) | SE438765B (sv) |
| SU (1) | SU1207406A3 (sv) |
| ZA (1) | ZA79451B (sv) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4253121A (en) * | 1978-10-12 | 1981-02-24 | Rca Corporation | Plural sequential operating mode automatic kinescope beam current limiter |
| US4209808A (en) * | 1979-03-26 | 1980-06-24 | Rca Corporation | Stabilized automatic brightness control network in a video signal processing system including an automatic kinescope beam current limiter |
| US4321513A (en) * | 1980-09-08 | 1982-03-23 | Rca Corporation | Television receiver high voltage protection circuit |
| US4451849A (en) * | 1982-06-23 | 1984-05-29 | Rca Corporation | Plural operating mode ambient light responsive television picture control |
| US4516152A (en) * | 1983-05-23 | 1985-05-07 | Rca Corporation | Video signal processor with automatic kinescope white balance and beam current limiter control systems |
| US4549218A (en) * | 1983-09-30 | 1985-10-22 | Rca Corporation | On-screen display |
| US4549217A (en) * | 1983-09-30 | 1985-10-22 | Rca Corporation | Automatic contrast reduction circuit for a teletext or monitor operation |
| US4599643A (en) * | 1983-12-29 | 1986-07-08 | Rca Corporation | Apparatus responsive to plural color video signals for amplitude limiting the video signals to assist beam current limiting |
| US4554578A (en) * | 1984-03-02 | 1985-11-19 | Rca Corporation | Error compensated control system in a video signal processor |
| US4633320A (en) * | 1984-03-08 | 1986-12-30 | Rca Corporation | Video signal processor with automatic kinescope beam current limiter |
| US4562479A (en) * | 1984-04-26 | 1985-12-31 | Rca Corporation | Automatic kinescope beam current limiter |
| 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 |
| US4901156A (en) * | 1986-12-26 | 1990-02-13 | Goldstart Co., Ltd. | Automatic brightness limiting circuit |
| US5068730A (en) * | 1989-04-20 | 1991-11-26 | Thomson Consumer Electronics, Inc. | Video control circuit |
| US5313294A (en) * | 1990-03-20 | 1994-05-17 | Rca Thomson Licensing Corporation | Beam current limiting arrangement having a peak amplitude, responsive threshold |
| GB9006250D0 (en) * | 1990-03-20 | 1990-05-16 | Rca Licensing Corp | Non-linear beam current limiter |
| US5847773A (en) * | 1991-08-30 | 1998-12-08 | Thomson Consumer Electronics, Inc. | Video system including apparatus for deactivating an automatic control arrangement |
| US5200829A (en) * | 1991-12-16 | 1993-04-06 | Thomson Consumer Electronics, Inc. | Contrast beam current limiting arrangement with secondary brightness beam current limiting provisions |
| US5177413A (en) * | 1992-02-25 | 1993-01-05 | Thomson Consumer Electronics, Inc. | Arrangement for generating a beam current indicative signal |
| KR100214634B1 (ko) * | 1996-12-21 | 1999-08-02 | 구자홍 | 프로젝션 티브이의 b색 감마보정 회로 |
| US6563495B1 (en) * | 1998-12-21 | 2003-05-13 | Thomson Licensing S.A. | Automatic screen saver |
| US6483557B1 (en) | 1999-11-05 | 2002-11-19 | Thomson Licensing Sa | Emission control in a video display |
| US6329770B1 (en) | 1999-11-05 | 2001-12-11 | Thomson Licensing S.A. | Control of emission in a video display |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1462900A1 (de) * | 1966-12-09 | 1968-12-19 | Philips Patentverwaltung | Schaltungsanordnung zur Strahlstrombegrenzung einer Elektronenstrahlroehre |
| US3914545A (en) * | 1972-08-02 | 1975-10-21 | Zenith Radio Corp | Automatic contrast control utilizing three control signals |
| JPS5230821Y2 (sv) * | 1973-02-28 | 1977-07-14 | ||
| US3848945A (en) * | 1973-03-16 | 1974-11-19 | Warwick Electronics Inc | Brightness limiting circuit |
| US3842201A (en) * | 1973-04-09 | 1974-10-15 | Gen Electric | Beam current limiter |
| NL179329C (nl) * | 1974-09-09 | 1986-08-18 | Philips Nv | Televisieontvanger met een bundelstroombegrenzingsschakeling. |
| JPS59843Y2 (ja) * | 1975-10-20 | 1984-01-11 | ソニー株式会社 | テレビジユゾウキ |
| US4067048A (en) * | 1976-08-19 | 1978-01-03 | Rca Corporation | Automatic beam current limiter |
| US4079424A (en) * | 1977-02-07 | 1978-03-14 | Rca Corporation | Automatic transient beam current limiter |
-
1978
- 1978-02-09 US US05/876,238 patent/US4167025A/en not_active Expired - Lifetime
-
1979
- 1979-01-30 CA CA320,541A patent/CA1127291A/en not_active Expired
- 1979-02-02 FI FI790353A patent/FI67005C/fi not_active IP Right Cessation
- 1979-02-02 IT IT19866/79A patent/IT1111785B/it active
- 1979-02-02 SE SE7900954A patent/SE438765B/sv not_active IP Right Cessation
- 1979-02-02 ZA ZA79451A patent/ZA79451B/xx unknown
- 1979-02-02 AT AT0078579A patent/AT382747B/de not_active IP Right Cessation
- 1979-02-02 CS CS79744A patent/CS252803B2/cs unknown
- 1979-02-05 AU AU43938/79A patent/AU530947B2/en not_active Expired
- 1979-02-05 BE BE193283A patent/BE873948A/xx not_active IP Right Cessation
- 1979-02-06 DD DD79210843A patent/DD141964A5/de unknown
- 1979-02-07 NZ NZ189587A patent/NZ189587A/xx unknown
- 1979-02-07 GB GB7904237A patent/GB2014409B/en not_active Expired
- 1979-02-07 JP JP54013178A patent/JPS5829033B2/ja not_active Expired
- 1979-02-08 FR FR7903247A patent/FR2417225A1/fr active Granted
- 1979-02-08 SU SU792720498A patent/SU1207406A3/ru active
- 1979-02-08 MX MX79100700U patent/MX4381E/es unknown
- 1979-02-08 NL NL7901015A patent/NL7901015A/xx not_active Application Discontinuation
- 1979-02-08 DK DK52379A patent/DK148110C/da not_active IP Right Cessation
- 1979-02-09 DE DE2905005A patent/DE2905005C2/de not_active Expired
- 1979-02-09 ES ES477608A patent/ES477608A1/es not_active Expired
- 1979-02-09 PL PL1979213321A patent/PL119550B1/pl unknown
-
1985
- 1985-12-30 MY MY714/85A patent/MY8500714A/xx unknown
-
1987
- 1987-02-26 HK HK164/87A patent/HK16487A/xx not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MA | Patent expired | ||
| MA | Patent expired |
Owner name: RCA LICENSING CORPORATION |