GB1301995A - - Google Patents
Info
- Publication number
- GB1301995A GB1301995A GB2510071A GB2510071A GB1301995A GB 1301995 A GB1301995 A GB 1301995A GB 2510071 A GB2510071 A GB 2510071A GB 2510071 A GB2510071 A GB 2510071A GB 1301995 A GB1301995 A GB 1301995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- members
- envelope
- hood
- ferromagnetic
- 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
- 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
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
-
- 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
-
- 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
- H01J2229/0046—Preventing or cancelling fields within the enclosure
- H01J2229/0053—Demagnetisation
Abstract
1301995 Cathode-ray display tubes LICENTIA-PATENT-VERWALTUNGS-GmbH 19 April 1971 [28 March 1970] 25100/71 Heading H1D [Also in Division H4] For demagnetizing a colour picture tube a ferromagnetic hood 7 (Fig. 4) is provided inside the tube envelope and coacts magnetically with ferromagnetic sheet members 4 (see also Figs. 2 and 3) the hood being excited by a decaying alternating current supplied to a coil 6 surrounding the tube envelope and the members 4 by a similar current supplied to coils 5 wound around the members and secured in notches provided in the latter. Alternatively, coils 8 (Fig. 5) may be provided between the envelope of the tube and the members 4. The latter may be secured to the tube by screwing, riveting or welding to or casting with the anti-implosion band or they may be detachably mounted by means of insulating holding means. Tension springs at the tube neck may be employed to pull the members 4 towards the envelope. The members 4 are preferably blackened on their insides to absorb the thermal radiation from the tube. The ferromagnetic hood forms with the shadow mask a closed magnetically screened chamber and compensates for the earth's magnetic field.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702014993 DE2014993B2 (en) | 1970-03-28 | 1970-03-28 | COLOR TUBE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1301995A true GB1301995A (en) | 1973-01-04 |
Family
ID=5766558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2510071A Expired GB1301995A (en) | 1970-03-28 | 1971-04-19 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS561000B1 (en) |
| DE (1) | DE2014993B2 (en) |
| FR (1) | FR2085101A5 (en) |
| GB (1) | GB1301995A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3616906A1 (en) * | 1985-05-20 | 1986-11-20 | Mitsubishi Electric Corp | MAGNETIC SHIELDING SYSTEM IN A COLOR TV RECEIVER |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4556821A (en) * | 1984-03-15 | 1985-12-03 | Rca Corporation | Color image display system having an improved external magnetic shield |
| KR900001701B1 (en) * | 1985-03-20 | 1990-03-19 | 미쯔비시 뎅기 가부시끼가이샤 | Color crt |
-
1970
- 1970-03-28 DE DE19702014993 patent/DE2014993B2/en not_active Withdrawn
-
1971
- 1971-03-23 JP JP1682371A patent/JPS561000B1/ja active Pending
- 1971-03-24 FR FR7110441A patent/FR2085101A5/fr not_active Expired
- 1971-04-19 GB GB2510071A patent/GB1301995A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3616906A1 (en) * | 1985-05-20 | 1986-11-20 | Mitsubishi Electric Corp | MAGNETIC SHIELDING SYSTEM IN A COLOR TV RECEIVER |
| GB2177539A (en) * | 1985-05-20 | 1987-01-21 | Mitsubishi Electric Corp | Magnetic shielding system in color television receiver |
| GB2177539B (en) * | 1985-05-20 | 1989-07-05 | Mitsubishi Electric Corp | Magnetic shielding system in color television receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2014993B2 (en) | 1972-02-17 |
| DE2014993A1 (en) | 1971-09-30 |
| FR2085101A5 (en) | 1971-12-17 |
| JPS561000B1 (en) | 1981-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |