GB930734A - Protection circuit for cathode ray tubes - Google Patents
Protection circuit for cathode ray tubesInfo
- Publication number
- GB930734A GB930734A GB20842/60A GB2084260A GB930734A GB 930734 A GB930734 A GB 930734A GB 20842/60 A GB20842/60 A GB 20842/60A GB 2084260 A GB2084260 A GB 2084260A GB 930734 A GB930734 A GB 930734A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pentode
- fields
- circuit
- magneto
- june
- 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)
- X-Ray Techniques (AREA)
Abstract
930,734. Cathode-ray tube protection circuits. PYE Ltd. June 8, 1961 [June 14, 1960], No. 20842/60. Class 40 (7). In the absence of one or more magnetic scanning fields the beam of a C.R.T. is cut-off, the fields being sensed by search coils or magneto-resistive or magneto-voltaic elements. During normal operation, the signals induced in search coils L1, L2 and L3, L4 by the horizontal and vertical scanning fields respectively are rectified at X1, X2 and applied respectively to overcome the negative biases applied to the suppressor and control grids of pentode V1 by potentiometers P2, P1, respectively. The pentode is thus conducting and relay RL operated to maintain the C.R.T. beam. If either scanning field fails, the associated grid of valve V1 becomes negative, the valve cuts-off, and relay RL is de-energized to switch-off the beam. In this embodiment the inductance L5 is provided to cause ringing in the circuit feeding XI and transformer T1 is so designed as to cause ringing in the other input circuit so that the circuit may function on both forward and reverse directions of scan. In another embodiment the pentode is replaced by a pair of series-connected triodes and the horizontal search-coil output is fed to a pair of diodes, one of which acts as a D.C. restorer, so that the arrangement can accept positive and negative pulses.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20842/60A GB930734A (en) | 1960-06-14 | 1960-06-14 | Protection circuit for cathode ray tubes |
| DEP27263A DE1160956B (en) | 1960-06-14 | 1961-06-02 | Circuit arrangement for protecting cathode ray tubes, in particular television camera tubes |
| FR864253A FR1291419A (en) | 1960-06-14 | 1961-06-08 | Protective assembly for cathode ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20842/60A GB930734A (en) | 1960-06-14 | 1960-06-14 | Protection circuit for cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB930734A true GB930734A (en) | 1963-07-10 |
Family
ID=10152642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20842/60A Expired GB930734A (en) | 1960-06-14 | 1960-06-14 | Protection circuit for cathode ray tubes |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1160956B (en) |
| FR (1) | FR1291419A (en) |
| GB (1) | GB930734A (en) |
-
1960
- 1960-06-14 GB GB20842/60A patent/GB930734A/en not_active Expired
-
1961
- 1961-06-02 DE DEP27263A patent/DE1160956B/en active Pending
- 1961-06-08 FR FR864253A patent/FR1291419A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1160956B (en) | 1964-01-09 |
| FR1291419A (en) | 1962-04-20 |
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