GB403283A - Improvements in or relating to television apparatus, synchronising apparatus and thelike - Google Patents
Improvements in or relating to television apparatus, synchronising apparatus and thelikeInfo
- Publication number
- GB403283A GB403283A GB12639/33A GB1263933A GB403283A GB 403283 A GB403283 A GB 403283A GB 12639/33 A GB12639/33 A GB 12639/33A GB 1263933 A GB1263933 A GB 1263933A GB 403283 A GB403283 A GB 403283A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- impulses
- saw
- condenser
- 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
- 230000003321 amplification Effects 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000000737 periodic effect Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
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
Landscapes
- Details Of Television Scanning (AREA)
Abstract
403,283. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London.-(Assignees of Tolson, W. A. ; 631, Jefferson Avenue, Erlton, New Jersey, U.S.A.) May 1, 1933, No. 12639. Convention date, April 30, 1932. [Classes 40 (iii) and 40 (v).] A saw-tooth current 40 for deflecting a cathode ray 15 is generated by a back-coupled thermionic blocking oscillator 20 with a shaping circuit 34 in its output circuit to produce a voltage wave 39, which has a saw-tooth component and a component of short impulses separated by relatively long intervals and is applied to a single amplification stage 38. The valve 20 produces periodic current impulses by back-coupling through a transformer 21. Grid-current, flowing during the impulse, accumulates on a grid condenser 22 to prevent another impulse until the charge has leaked away through a high resistance 24. The values of the grid leak and condenser are such that the impulses are generated at the line-scanning frequency, the impulses being synchronised by positive signals applied to the valve through a filter 32. A condenser 35 and a resistance 37 are connected in the output circuit of the valve, and the voltage wave developed across this network 34 has the form 39. This voltage, applied to the grid of the valve 38, gives rise to the saw-tooth current 40, which passes through deflecting-coils 17 of a cathode-ray tube 10. A saw-tooth current of the picture frequency is generated by a similar circuit 30a, and passed through deflecting coils 18 to give the other component of scanning. According to modifications : the resistance 36 is connected across the condenser 35, Fig. 2 (not shown) ; a screen-grid valve is used as the generator, Fig. 3 (not shown) ; negative synchronising impulses are used, Fig. 4 (not shown). Specifications 395,499 and 402,629 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US608460A US1999378A (en) | 1932-04-30 | 1932-04-30 | Television system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB403283A true GB403283A (en) | 1933-12-21 |
Family
ID=24436603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12639/33A Expired GB403283A (en) | 1932-04-30 | 1933-05-01 | Improvements in or relating to television apparatus, synchronising apparatus and thelike |
Country Status (2)
Country | Link |
---|---|
US (2) | US1999378A (en) |
GB (1) | GB403283A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE741454C (en) * | 1934-12-20 | 1943-11-11 | Telefunken Gmbh | Arrangement for generating a saegezahnfoermigen current curve, especially for the magnetic deflection of cathode rays for oscilloscope and television purposes |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2493517A (en) * | 1942-07-24 | 1950-01-03 | Jr Alexander R Applegarth | Blocking oscillator |
US2417522A (en) * | 1944-03-16 | 1947-03-18 | Rca Corp | Multivibrator circuit |
US2549812A (en) * | 1944-05-13 | 1951-04-24 | Hillman Leon | Wind velocity measuring means |
US2486021A (en) * | 1945-02-28 | 1949-10-25 | Raytheon Mfg Co | Oscillator |
US2573284A (en) * | 1948-10-16 | 1951-10-30 | Rca Corp | Oscillator |
-
0
- US US20338D patent/USRE20338E/en not_active Expired
-
1932
- 1932-04-30 US US608460A patent/US1999378A/en not_active Expired - Lifetime
-
1933
- 1933-05-01 GB GB12639/33A patent/GB403283A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE741454C (en) * | 1934-12-20 | 1943-11-11 | Telefunken Gmbh | Arrangement for generating a saegezahnfoermigen current curve, especially for the magnetic deflection of cathode rays for oscilloscope and television purposes |
Also Published As
Publication number | Publication date |
---|---|
USRE20338E (en) | 1937-04-20 |
US1999378A (en) | 1935-04-30 |
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