GB402181A - Improvements in or relating to television and the like systems - Google Patents
Improvements in or relating to television and the like systemsInfo
- Publication number
- GB402181A GB402181A GB19293/32A GB1929332A GB402181A GB 402181 A GB402181 A GB 402181A GB 19293/32 A GB19293/32 A GB 19293/32A GB 1929332 A GB1929332 A GB 1929332A GB 402181 A GB402181 A GB 402181A
- Authority
- GB
- United Kingdom
- Prior art keywords
- deflecting
- potential
- ray
- tube
- valve
- 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
402,181. Oscillographs. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Hayes, Middlesex, and MANIFOLD, M. BOWMAN-, Heathcot, Worplesdon Station, Surrey..July 7, 1932, No. 19293. [Class 37.] A cathode ray is periodically deflected over a screen 4, Fig. 1, under the control of synchronising signals and is rendered innocuous to the screen by auxiliary apparatus when the deflection fails. A condenser 7 is charged slowly, and discharged periodically through a valve 5 when signals are applied to the latter. A saw-tooth voltage is thus applied to deflecting-plates 8, 9 in the cathoderay tube 1. A neon tube 10 is shunted across the condenser and discharges it when the voltage across it exceeds the normal owing to failure of the synchronising signals. The ray is thus kept in motion over the screen. The saw-tooth voltage may be applied to an amplifying valve, Fig. 2 (not shown), the anode current of which is passed through deflecting-coils, Fig. 3 (not shown). In Fig. 4, the safety circuit comprises a valve 15 with such a high positive potential on its cathode 16, that anode current only flows when the voltage on the condenser 7, to which the grid 17 is connected, becomes abnormally high. This current decreases the potential of a control electrode 19 to reduce the intensity of the ray. According to modifications : the saw-tooth voltage is applied to an amplifying valve, Fig. 5 (not shown) and the anode current passed through deflecting-coils, Fig. 6 (not shown) ; the plate of the auxiliary valve is connected to deflecting-coils, Fig. 7 (not shown). In Fig. 8, the deflecting-current in coils 13, 14 passes through a rectifier 25, the output from which energizes a relay 26 to apply a normal potential to a control electrode 41 from a battery 28. On failure of the deflecting current, a battery 29 supplies a higher negative potential to reduce the intensity of the ray. A modification using electrostatic deflection is described, Fig. 9 (not shown). To prevent the ray coming to rest before being extinguished on switching off, the cathode 2, Fig. 10, of the tube is positively biased from a potentiometer 35 connected to the rectifier 33 supplying anode potential to the tube, and the control grid 41 is negatively biased from a potentiometer 37 connected to the rectifier 44 supplying potential to the generator 23 of deflecting currents. The time constant of the former biasing-circuit is greater than the latter, so that the negative grid tends to remain high in the initial period after switching off the source 32. When the deflecting-circuit and the heating circuit of the cathode of the tube are controlled by a common switch, a resistance is inserted in the heating circuit so that, on switching on, the deflecting circuit operates at least as soon as a visible spot is formed on the fluorescent screen.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB19293/32A GB402181A (en) | 1932-07-07 | 1932-07-07 | Improvements in or relating to television and the like systems |
US678815A US2210702A (en) | 1932-07-07 | 1933-07-03 | Television system |
FR758428D FR758428A (en) | 1932-07-07 | 1933-07-06 | Improvements to Television and Similar Devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB19293/32A GB402181A (en) | 1932-07-07 | 1932-07-07 | Improvements in or relating to television and the like systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB402181A true GB402181A (en) | 1933-11-30 |
Family
ID=10126983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19293/32A Expired GB402181A (en) | 1932-07-07 | 1932-07-07 | Improvements in or relating to television and the like systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US2210702A (en) |
FR (1) | FR758428A (en) |
GB (1) | GB402181A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE755117C (en) * | 1936-09-15 | 1951-07-26 | Fernseh Gmbh | Arrangement for generating an anode voltage for electron beam tubes by rectifying a tilting oscillation serving for electromagnetic beam deflection |
DE758152C (en) * | 1934-09-29 | 1953-03-09 | Rca Corp | Cathode ray tubes with periodically working coil deflection, especially for television purposes |
DE898456C (en) * | 1937-12-18 | 1953-11-30 | Fernseh Gmbh | Arrangement for automatic image brightness control in circuits with cathode ray tubes for image reproduction, especially television transmission equipment |
DE926372C (en) * | 1931-07-14 | 1955-05-23 | Fernseh Gmbh | Arrangement for electromagnetic beam deflection for cathode ray tubes |
DE965498C (en) * | 1950-09-20 | 1957-06-13 | N V Philips Gloeilampenfabrieken Eindhoven (Niederlande) | I Circuit arrangement for protecting the picture tube in a television receiver |
US4811083A (en) * | 1983-06-15 | 1989-03-07 | Tektronix, Inc. | Apparatus for displaying the phase and amplitude of a chrominance signal |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE755468C (en) * | 1934-11-06 | 1954-11-22 | Opta Radio A G | Circuit arrangement for generating blocking pulses for beam suppression in television cathode ray tubes |
US2426419A (en) * | 1942-12-23 | 1947-08-26 | Du Mont Allen B Lab Inc | Return trace blanking and mixing |
US2448771A (en) * | 1943-09-23 | 1948-09-07 | Du Mont Allen B Lab Inc | Cathode-ray oscillograph circuit |
US2492674A (en) * | 1945-12-20 | 1949-12-27 | Sylvania Electric Prod | Cathode-ray tube circuits |
US2543831A (en) * | 1948-02-10 | 1951-03-06 | Belmont Radio Corp | Protection of cathode-ray tube screens |
BE520983A (en) * | 1952-06-27 | |||
US2846616A (en) * | 1954-12-08 | 1958-08-05 | Philips Corp | Circuit-arrangement protecting the cathode-ray tube of television receivers |
US3146372A (en) * | 1961-01-17 | 1964-08-25 | Raymond B Fertig | Sweep-failure protection circuit for cathode-ray tubes |
US3555348A (en) * | 1969-01-13 | 1971-01-12 | Ibm | Cathode ray tube screen protection system |
-
1932
- 1932-07-07 GB GB19293/32A patent/GB402181A/en not_active Expired
-
1933
- 1933-07-03 US US678815A patent/US2210702A/en not_active Expired - Lifetime
- 1933-07-06 FR FR758428D patent/FR758428A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE926372C (en) * | 1931-07-14 | 1955-05-23 | Fernseh Gmbh | Arrangement for electromagnetic beam deflection for cathode ray tubes |
DE758152C (en) * | 1934-09-29 | 1953-03-09 | Rca Corp | Cathode ray tubes with periodically working coil deflection, especially for television purposes |
DE755117C (en) * | 1936-09-15 | 1951-07-26 | Fernseh Gmbh | Arrangement for generating an anode voltage for electron beam tubes by rectifying a tilting oscillation serving for electromagnetic beam deflection |
DE898456C (en) * | 1937-12-18 | 1953-11-30 | Fernseh Gmbh | Arrangement for automatic image brightness control in circuits with cathode ray tubes for image reproduction, especially television transmission equipment |
DE965498C (en) * | 1950-09-20 | 1957-06-13 | N V Philips Gloeilampenfabrieken Eindhoven (Niederlande) | I Circuit arrangement for protecting the picture tube in a television receiver |
US4811083A (en) * | 1983-06-15 | 1989-03-07 | Tektronix, Inc. | Apparatus for displaying the phase and amplitude of a chrominance signal |
Also Published As
Publication number | Publication date |
---|---|
US2210702A (en) | 1940-08-06 |
FR758428A (en) | 1934-01-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB402181A (en) | Improvements in or relating to television and the like systems | |
CA1078507A (en) | High voltage shutdown circuit responsive to excessive beam current and high voltage | |
US2285043A (en) | Television receiver | |
US2261645A (en) | Protective system | |
US2222426A (en) | Cathode ray tube television and like apparatus | |
GB698296A (en) | Improvements in or relating to television receiver circuit arrangements | |
US1956416A (en) | High voltage discharge apparatus | |
US2476167A (en) | Electrical protection of cathoderay tube screens | |
GB1355120A (en) | Electron-beam fluorescent screen picture tube arrangements | |
US2638562A (en) | Kinescope residual beam extinction circuit | |
GB945145A (en) | Improvements relating to circuits for protecting the luminescent coatings of cathoderay tubes | |
US2153216A (en) | Electron tube system | |
US3448328A (en) | Cathode ray tube bright spot eliminating circuit | |
KR100406572B1 (en) | power supplying device for electron gun in CDT | |
US2055611A (en) | Saw-tooth wave form current and voltage generating device | |
US2635208A (en) | Television circuit | |
US2752525A (en) | Protection circuit for cathode ray tubes | |
US2607018A (en) | Means and method for protecting kinescope screens | |
US2248815A (en) | Television receiver | |
US2404624A (en) | Voltage regulator for electron discharge devices | |
GB754169A (en) | Cathode ray tube circuit arrangement | |
US2473330A (en) | Voltage control system for cathode-ray tubes | |
US2254025A (en) | Saw-tooth wave generator | |
US2216729A (en) | Electric discharge system | |
GB480521A (en) | Improvements in or relating to cathode ray television apparatus |