GB1047515A - - Google Patents
Info
- Publication number
- GB1047515A GB1047515A GB1047515DA GB1047515A GB 1047515 A GB1047515 A GB 1047515A GB 1047515D A GB1047515D A GB 1047515DA GB 1047515 A GB1047515 A GB 1047515A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control voltage
- during
- effected
- pulses
- states
- 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.)
- Active
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
1,047,515. Cathode-ray tube protection circuits. BRITISH BROADCASTING CORPORATION. May 7, 1964 [May 14, 1963], No. 19136/63. Heading H4T. A control voltage produced on failure of either the line of field deflection waveform sources of a cathode-ray tube is utilized to render the beam innocuous to the tube screen. The control may be effected by the application of a suppression bias to a suitable electrode of the tube together with, if desired, a " followup " protection effected by controlling the EHT voltage and the beam focus current. Alternatively, protection made be effected by deflecting the beam off the screen. In the described embodiment the control voltage which is utilized as a beam suppression bias on the control grid 23 (Fig. 1) is developed as a negatively-going pulse (Fig. 2, not shown) at point 24 during the stable states of monostable multivibrators 19, 21 the latter being triggered to such states by pulses derived from the line and field drive pulses respectively (which occur at the commencement of the flyback periods) and then triggered to the quasistable states, during which the control voltage is absent, by pulses derived from the trailing edges of the fly-back pulses produced in the line and field deflection coils. Thus, in normal operations the beam is un-suppressed during the forward stroke of the scanning saw-tooth and during the fly-back periods the control voltage is effective to suppress the beams, i.e. to effect normal blanking. However, upon failure of either the time-base circuits or the drive pulses therefor the multivibrators revert to their stable states and effect suppression of the beam or operate in the other manners referred to above.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1913663 | 1963-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1047515A true GB1047515A (en) |
Family
ID=10124340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1047515D Active GB1047515A (en) | 1963-05-14 |
Country Status (2)
Country | Link |
---|---|
US (1) | US3308333A (en) |
GB (1) | GB1047515A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160078A (en) * | 1984-06-05 | 1985-12-11 | Motorola Inc | Failure detection circuit |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3810024A (en) * | 1972-11-20 | 1974-05-07 | Westinghouse Electric Corp | Method and circuit for monitoring and detecting sweep signal failure |
DE2711636C2 (en) * | 1977-03-17 | 1984-07-12 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement for supplying a protection signal |
US4338623A (en) * | 1977-10-11 | 1982-07-06 | U.S. Philips Corporation | Video circuit with screen-burn-in protection |
US4164687A (en) * | 1978-04-10 | 1979-08-14 | Rca Corporation | Television kinescope protection circuit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2860283A (en) * | 1956-03-07 | 1958-11-11 | Isaac S Blonder | Electronic protective system |
-
0
- GB GB1047515D patent/GB1047515A/en active Active
-
1964
- 1964-05-08 US US366046A patent/US3308333A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160078A (en) * | 1984-06-05 | 1985-12-11 | Motorola Inc | Failure detection circuit |
Also Published As
Publication number | Publication date |
---|---|
US3308333A (en) | 1967-03-07 |
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