GB2010052A - Cathode ray tube apparatus - Google Patents
Cathode ray tube apparatusInfo
- Publication number
- GB2010052A GB2010052A GB7846236A GB7846236A GB2010052A GB 2010052 A GB2010052 A GB 2010052A GB 7846236 A GB7846236 A GB 7846236A GB 7846236 A GB7846236 A GB 7846236A GB 2010052 A GB2010052 A GB 2010052A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bey
- aex
- convergence
- ellipse
- degree
- 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.)
- Granted
Links
Classifications
-
- 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
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
In a convergence circuit for a shadow-mask colour cathode ray tube, the square of a horizontal deflecting signal ex is multiplied by coefficients dependent on the quadrant of the screen in which the display is located, and the square of a vertical deflecting signal ey is multiplied by coefficients also dependent on the quadrant, the degree of convergence following the sum of four signals thus formed. Alternatively, an ellipse centreing the display surface is defined by aex<2>+bey<2>=ec where a, b, ec designate constants. The degree of convergence follows aex<2> +bey<2>=el inside of the ellipse while following aex<2>+bey<2>+K(aex<2>+bey<H N=0><2>-ec) outside of the ellipse where K is a variable constant. By changing K for each of the quadrants, the degree of convergence may be different between them.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14189377A JPS5474322A (en) | 1977-11-25 | 1977-11-25 | Cathode-ray tube unit |
| JP15026877A JPS5481723A (en) | 1977-12-13 | 1977-12-13 | Cathode ray tube unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2010052A true GB2010052A (en) | 1979-06-20 |
| GB2010052B GB2010052B (en) | 1982-05-26 |
Family
ID=26474057
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7846236A Expired GB2010052B (en) | 1977-11-25 | 1978-11-27 | Cathode ray tube apparatus |
| GB7932676A Expired GB2030030B (en) | 1977-11-25 | 1979-09-20 | Cathode ray tube apparatus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7932676A Expired GB2030030B (en) | 1977-11-25 | 1979-09-20 | Cathode ray tube apparatus |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB2010052B (en) |
| SE (1) | SE7812084L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0059076A1 (en) * | 1981-02-19 | 1982-09-01 | Tektronix, Inc. | Convergence control system for multigun CRT |
| US5565744A (en) * | 1994-11-02 | 1996-10-15 | U.S. Philips Corporation | Waveform generation |
-
1978
- 1978-11-23 SE SE7812084A patent/SE7812084L/en unknown
- 1978-11-27 GB GB7846236A patent/GB2010052B/en not_active Expired
-
1979
- 1979-09-20 GB GB7932676A patent/GB2030030B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0059076A1 (en) * | 1981-02-19 | 1982-09-01 | Tektronix, Inc. | Convergence control system for multigun CRT |
| US5565744A (en) * | 1994-11-02 | 1996-10-15 | U.S. Philips Corporation | Waveform generation |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7812084L (en) | 1979-05-26 |
| GB2030030A (en) | 1980-03-26 |
| GB2030030B (en) | 1982-06-23 |
| GB2010052B (en) | 1982-05-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |