GB462885A - Improvements in television receiving apparatus - Google Patents
Improvements in television receiving apparatusInfo
- Publication number
- GB462885A GB462885A GB21124/36A GB2112436A GB462885A GB 462885 A GB462885 A GB 462885A GB 21124/36 A GB21124/36 A GB 21124/36A GB 2112436 A GB2112436 A GB 2112436A GB 462885 A GB462885 A GB 462885A
- Authority
- GB
- United Kingdom
- Prior art keywords
- application
- delayed
- cathode
- negative bias
- bias
- 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)
- Transforming Electric Information Into Light Information (AREA)
Abstract
462,885. Supply systems for cathode-ray tubes. HAZELTINE CORPORATION. July 30, 1936, No. 21124. Convention date, Aug. 22, 1935. [Class 38 (iv)] To prevent excessive intensity of the beam in a cathode-ray tube when first switching on by reason of the delayed application of a negative bias to a control electrode, the application of a positive bias to one or more electrodes is delayed for a period at least equal to the delay in the application of the negative bias. The negative control electrode 21 and the positive electrodes 22, 23, are supplied from the transformer 9 through a rectifier 3 and potentiometer 15, the circuit being closed by a time delay device 4 after the secondaries 2<a>, 2<e> have energized the control members 6, 7, 8 and the cathode heater 12<a> on closure of switch 14. Delay in the application of negative bias to the control electrode 21 results from the provision of an isolating resistance 39 and byepass condenser 40 in the supply to the cathode 20, for the purpose of preventing modulation of the beam by power supply reactions. The application of positive bias to the control electrodes 22, 23 is delayed, for at least the same period as the negative bias is delayed, by resistances 41, 43 and condensers 42, 44, thereby preventing a momentary flash.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US462885XA | 1935-08-22 | 1935-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB462885A true GB462885A (en) | 1937-03-17 |
Family
ID=21942637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21124/36A Expired GB462885A (en) | 1935-08-22 | 1936-07-30 | Improvements in television receiving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB462885A (en) |
-
1936
- 1936-07-30 GB GB21124/36A patent/GB462885A/en not_active Expired
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