GB711142A - Improvements in or relating to circuit arrangements for deflecting the beam of a cathode ray tube - Google Patents
Improvements in or relating to circuit arrangements for deflecting the beam of a cathode ray tubeInfo
- Publication number
- GB711142A GB711142A GB364351A GB364351A GB711142A GB 711142 A GB711142 A GB 711142A GB 364351 A GB364351 A GB 364351A GB 364351 A GB364351 A GB 364351A GB 711142 A GB711142 A GB 711142A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- deflecting
- circuit
- cathode
- failure
- 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
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
711,142. Television. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Feb. 4, 1952 [Feb. 15, 1951], No. 3643/51. Class 40 (3). [Also in Group XL(c)] A deflecting circuit for a cathode-ray tube in a television receiver comprises an electron discharge tube in the cathode circuit of which is included a coil for focusing the beam of the C.R. tube so that in the event of failure of the deflecting circuit the C.R. tube is defocused. The Figure shows the output stage of a line scanning circuit for a television receiver in which sawtooth deflecting currents are produced in the secondary winding of the output transformer 3. The focusing coil 4 of the C.R. tube is included in the cathode circuit of the discharge tube 1 and is bye-passed at radio-frequencies by capacitor 6 ; the cathode current of the tube 1 is adjusted by means of the variable screen resistor 7 so that the C.R. beam is correctly focused. On failure of the deflecting circuit, due, for example, to failure of the drive to tube 1 or breakdown of capacitor 8, the cathode current of tube 1 changes substantially and the C.R. beam is defocused thus reducing the likelihood of burning of the C.R. tube screen. Specification 534,465 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB364351A GB711142A (en) | 1951-02-15 | 1951-02-15 | Improvements in or relating to circuit arrangements for deflecting the beam of a cathode ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB364351A GB711142A (en) | 1951-02-15 | 1951-02-15 | Improvements in or relating to circuit arrangements for deflecting the beam of a cathode ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB711142A true GB711142A (en) | 1954-06-23 |
Family
ID=9762193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB364351A Expired GB711142A (en) | 1951-02-15 | 1951-02-15 | Improvements in or relating to circuit arrangements for deflecting the beam of a cathode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB711142A (en) |
-
1951
- 1951-02-15 GB GB364351A patent/GB711142A/en not_active Expired
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