GB456666A - Improvements in or relating to scanning oscillators for television and like systems - Google Patents
Improvements in or relating to scanning oscillators for television and like systemsInfo
- Publication number
- GB456666A GB456666A GB1449735A GB1449735A GB456666A GB 456666 A GB456666 A GB 456666A GB 1449735 A GB1449735 A GB 1449735A GB 1449735 A GB1449735 A GB 1449735A GB 456666 A GB456666 A GB 456666A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coils
- scanning
- television
- saw
- relating
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
- H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
- H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
- H03K4/32—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
- H03K4/34—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses using a single tube with positive feedback through a transformer
Landscapes
- Details Of Television Scanning (AREA)
- Magnetic Treatment Devices (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Mechanical Means For Catching Fish (AREA)
Abstract
456,666. Valve generating circuits. TINGLEY, G. R., PUGH, D. W., and BAIRD TELEVISION, Ltd., 58, Victoria Street, Westminster. May 17, 1935, No. 14497. [Class 40 (v)] In a scanning oscillator comprising a back - coupled valve which tends to oscillate at some arbitrary frequency, such oscillation being modified or prevented by overcoupling at the scanning frequency, ripple in the saw tooth current is eliminated by shunting the deflector coils. Preferably an adjustable capacity is connected between the grid and anode circuits to control the fly-back time, the minimum duration of which is determined by the air-gap in the ferromagnetic core on which coils 2, 3 are wound. The circuit shunted across the deflector coils 8 comprises a condenser 10 and an adjustable resistance 11, the latter providing a means for varying the amplitude of the saw-tooth currents. Locking impulses may be applied to a coil 14 on the same core as the coils 2, 3 or to a screengrid. A push-pull arrangement may be used. Specification 456,138 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1410936A GB456640A (en) | 1935-05-17 | 1935-05-17 | Improvements in or relating to scanning oscillators for television and like systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB456666A true GB456666A (en) | 1936-11-13 |
Family
ID=10035146
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1410936A Expired GB456640A (en) | 1935-05-17 | 1935-05-17 | Improvements in or relating to scanning oscillators for television and like systems |
| GB1449735A Expired GB456666A (en) | 1935-05-17 | 1935-05-17 | Improvements in or relating to scanning oscillators for television and like systems |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1410936A Expired GB456640A (en) | 1935-05-17 | 1935-05-17 | Improvements in or relating to scanning oscillators for television and like systems |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE729481C (en) |
| FR (1) | FR806561A (en) |
| GB (2) | GB456640A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE895917C (en) * | 1937-10-16 | 1953-11-09 | Fernseh Gmbh | Self-oscillating toggle circuit for generating saw tooth flows that generate an image grid that deviates from the rectangular shape |
| DE756518C (en) * | 1938-01-20 | 1953-11-09 | Telefunken Gmbh | Circuit arrangement for generating saegezahnfoermiger currents |
| US2493044A (en) * | 1946-06-22 | 1950-01-03 | Farnsworth Res Corp | Deflection wave generator |
| BE488391A (en) * | 1948-04-09 |
-
1935
- 1935-05-17 GB GB1410936A patent/GB456640A/en not_active Expired
- 1935-05-17 GB GB1449735A patent/GB456666A/en not_active Expired
-
1936
- 1936-05-16 FR FR806561D patent/FR806561A/en not_active Expired
- 1936-05-19 DE DEF81169D patent/DE729481C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR806561A (en) | 1936-12-19 |
| GB456640A (en) | 1936-11-12 |
| DE729481C (en) | 1942-12-17 |
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