GB1327364A - Cathode ray tubes and shields therefor - Google Patents
Cathode ray tubes and shields thereforInfo
- Publication number
- GB1327364A GB1327364A GB5660371A GB5660371A GB1327364A GB 1327364 A GB1327364 A GB 1327364A GB 5660371 A GB5660371 A GB 5660371A GB 5660371 A GB5660371 A GB 5660371A GB 1327364 A GB1327364 A GB 1327364A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tubes
- shield
- frame
- flanges
- dec
- 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
- H01J29/02—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
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
- H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
- H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
1327364 Cathode-ray tubes RCA CORPORATION 6 Dec 1971 [7 Dec 1970] 56603/71 Heading H1D A cathode ray tube comprises an envelope with a rectangular faceplate with a phosphor screen and funnel portion of truncated pyramidal shape, and a funnel shaped internal magnetic shield 35 of truncated pyramidal geometry and made of four trapezoidal pieces of magnetic sheet metal attached along their non-parallel sides. The shield screens electron beams from stray magnetic fields such as the earth's field, and eliminates misregister of beam spots and colour phosphor elements such as in shadow mask type TV picture tubes and with high deflection angles (e.g. 110 degrees), which have shields extending at least along the forward half of the screen. The shield may be made up of four pre-annealed trapezoidal pieces of magnetic sheet metal, preferably attached by welding or riveting overlapping flanges (41) Fig. 3 (not shown) integral with the metal pieces and mounted on an electrode, e.g. a shadow mask frame 23 such as by welding flanges (45), (49) (Figs. 3 to 5, not shown) which are telescoped over the frame. Notches (49) are provided to clear mounting springs (31) or plates. Flange 29 may intercept over-scanned electrons, and four leaf springs 31 may be welded to the frame or intermediate bi-metallic plate. The plates may be cut from Al-killed steel of 4 to 8 mm. thickness and stamped to form the integral flanges and then preferably annealed. Alternatively annealing may be before stamping. The tubes may be colour tubes other than shadow mark types, and may be oscillograph tubes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US9577970A | 1970-12-07 | 1970-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1327364A true GB1327364A (en) | 1973-08-22 |
Family
ID=22253552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5660371A Expired GB1327364A (en) | 1970-12-07 | 1971-12-06 | Cathode ray tubes and shields therefor |
Country Status (9)
Country | Link |
---|---|
JP (1) | JPS5118308B1 (en) |
AU (1) | AU468527B2 (en) |
BE (1) | BE776320A (en) |
CA (1) | CA942370A (en) |
DE (1) | DE2159386C3 (en) |
FR (1) | FR2117422A5 (en) |
GB (1) | GB1327364A (en) |
IT (1) | IT941768B (en) |
NL (1) | NL171642C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0038516A1 (en) * | 1980-04-17 | 1981-10-28 | Kabushiki Kaisha Toshiba | Color picture tube provided with an inner magnetic shield |
GB2365204A (en) * | 2000-06-01 | 2002-02-13 | Sony Electronics | A magnetic shield for a cathode ray tube |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8003608A (en) * | 1980-06-23 | 1982-01-18 | Philips Nv | COLOR IMAGE TUBE. |
KR900001701B1 (en) * | 1985-03-20 | 1990-03-19 | 미쯔비시 뎅기 가부시끼가이샤 | Color crt |
BE1007665A3 (en) * | 1993-10-22 | 1995-09-05 | Philips Electronics Nv | Colour picture tube with magnetic shielding |
EP0650180B1 (en) * | 1993-10-22 | 1997-09-17 | Koninklijke Philips Electronics N.V. | Color display tube having a magnetic shield |
-
1971
- 1971-10-27 CA CA126,300A patent/CA942370A/en not_active Expired
- 1971-11-23 AU AU36043/71A patent/AU468527B2/en not_active Expired
- 1971-11-23 IT IT3150971A patent/IT941768B/en active
- 1971-11-30 DE DE19712159386 patent/DE2159386C3/en not_active Expired
- 1971-12-06 GB GB5660371A patent/GB1327364A/en not_active Expired
- 1971-12-06 NL NL7116726A patent/NL171642C/en not_active IP Right Cessation
- 1971-12-06 JP JP9857871A patent/JPS5118308B1/ja active Pending
- 1971-12-06 FR FR7143673A patent/FR2117422A5/fr not_active Expired
- 1971-12-06 BE BE776320A patent/BE776320A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0038516A1 (en) * | 1980-04-17 | 1981-10-28 | Kabushiki Kaisha Toshiba | Color picture tube provided with an inner magnetic shield |
GB2365204A (en) * | 2000-06-01 | 2002-02-13 | Sony Electronics | A magnetic shield for a cathode ray tube |
US6597100B2 (en) | 2000-06-01 | 2003-07-22 | Sony Electronics (Singapore) Pte Ltd | Magnetic shield for a cathode ray tube |
Also Published As
Publication number | Publication date |
---|---|
JPS5118308B1 (en) | 1976-06-09 |
DE2159386C3 (en) | 1978-04-27 |
FR2117422A5 (en) | 1972-07-21 |
DE2159386A1 (en) | 1972-06-15 |
AU3604371A (en) | 1973-06-21 |
AU468527B2 (en) | 1973-06-21 |
NL7116726A (en) | 1972-06-09 |
DE2159386B2 (en) | 1977-08-25 |
NL171642B (en) | 1982-11-16 |
BE776320A (en) | 1972-04-04 |
IT941768B (en) | 1973-03-10 |
NL171642C (en) | 1983-04-18 |
CA942370A (en) | 1974-02-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |