GB1257528A - - Google Patents
Info
- Publication number
- GB1257528A GB1257528A GB1257528DA GB1257528A GB 1257528 A GB1257528 A GB 1257528A GB 1257528D A GB1257528D A GB 1257528DA GB 1257528 A GB1257528 A GB 1257528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- tube axis
- compensated
- terrestial
- magnetic field
- 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
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
- H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/003—Preventing or cancelling fields entering the enclosure
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
1,257,528. Colour television tubes. THOMSON CSF. 23 June, 1969 [16 July, 1968], No. 31637/69. Heading H1D. A colour TV tube for correcting the effect of the terrestial magnetic field has four separate flat electromagnets B1 B2, B3, B4, which may be horn shaped (cf., Fig. 8, not shown) one electromagnet being mounted at each of the four screen corners, against and outside and frontally thereof for producing a magnetic field parallel to the tube axis and decreasing from the corners towards the screen centre. The coils may be in series and separately supplied and controlled. Deflections compensated may be as in Figs. 5 and 6 (not shown) due respectively to the terrestial vertical component and horizontal component perpendicular to the tube axis, and the component parallel to the tube axis may be compensated by the coil surrounding the screen used for demagnetization at starting. Mention is made of wider potential tolerance of chromatic purity electrode P (Fig. 1, not shown) and reference is made to a screen with phosphor stripes and dots.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR159318 | 1968-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1257528A true GB1257528A (en) | 1971-12-22 |
Family
ID=8652615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1257528D Expired GB1257528A (en) | 1968-07-16 | 1969-06-23 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3588583A (en) |
| DE (1) | DE1935789A1 (en) |
| FR (1) | FR1600842A (en) |
| GB (1) | GB1257528A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2196817A (en) * | 1986-10-30 | 1988-05-05 | Ibm | Degaussing system offsets ambient magnetic fields |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3887833A (en) * | 1969-06-16 | 1975-06-03 | Hitachi Ltd | Color purity adjusting device for a color picture tube |
| NL149035B (en) * | 1970-04-10 | 1976-03-15 | Philips Nv | PROCEDURE FOR ADJUSTING THE COLOR PURITY IN A COLOR TV DISPLAY TUBE, AS WELL AS A DEVICE FOR PERFORMING THIS PROCEDURE. |
| JPS5320993Y2 (en) * | 1972-08-09 | 1978-06-02 | ||
| NL167289C (en) * | 1973-09-13 | 1981-11-16 | Philips Nv | COLOR TELEVISION DEVICE EQUIPPED WITH A COLOR TELEVISION IMAGE TUBE AND DEMAGNETIZING DEVICE. |
| JPS5536928Y2 (en) * | 1974-04-19 | 1980-08-30 | ||
| US4243913A (en) * | 1979-08-29 | 1981-01-06 | Rca Corporation | Color picture tube magnetic shielding and degaussing structure |
| EP0555094A2 (en) * | 1992-02-07 | 1993-08-11 | Matsushita Electric Industrial Co., Ltd. | Beam landing correction apparatus for a cathode ray tube |
| US5583401A (en) * | 1992-02-07 | 1996-12-10 | Matsushita Electric Industrial Co., Ltd. | Beam landing correction apparatus for a cathode ray tube |
| JPH08340544A (en) * | 1995-06-14 | 1996-12-24 | Sony Corp | Method for degaussing cathode ray tube |
-
1968
- 1968-07-16 FR FR159318A patent/FR1600842A/fr not_active Expired
-
1969
- 1969-06-23 GB GB1257528D patent/GB1257528A/en not_active Expired
- 1969-06-27 US US837288A patent/US3588583A/en not_active Expired - Lifetime
- 1969-07-15 DE DE19691935789 patent/DE1935789A1/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2196817A (en) * | 1986-10-30 | 1988-05-05 | Ibm | Degaussing system offsets ambient magnetic fields |
Also Published As
| Publication number | Publication date |
|---|---|
| US3588583A (en) | 1971-06-28 |
| DE1935789A1 (en) | 1970-03-12 |
| FR1600842A (en) | 1970-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |