GB672075A - Television deflection power recovery circuits - Google Patents
Television deflection power recovery circuitsInfo
- Publication number
- GB672075A GB672075A GB10526/50A GB1052650A GB672075A GB 672075 A GB672075 A GB 672075A GB 10526/50 A GB10526/50 A GB 10526/50A GB 1052650 A GB1052650 A GB 1052650A GB 672075 A GB672075 A GB 672075A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitors
- voltage
- cathode
- anode
- ray tube
- 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
- 238000011084 recovery Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 5
- 238000013016 damping Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000004804 winding Methods 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/66—Transforming electric information into light information
- H04N5/68—Circuit details for cathode-ray display tubes
Landscapes
- Details Of Television Scanning (AREA)
- Rectifiers (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Fireproofing Substances (AREA)
Abstract
672,075. Television. RADIO CORPORATION OF AMERICA. April 28, 1950 [April 30, 1949], No. 10526/50. Class 40 (iii). [Also in Group XL (c)] Fig. 1 shows an electromagnetic scanning circuit for a cathode-ray tube 56 in which a saw-tooth voltage from a source 10 is applied via a cathode follower stage 20 to the grid of a driver stage 38 to produce a saw-tooth current flow in the deflecting coils 54, a portion of the scanning current being supplied by the damping diode 72. Capacitors 62 and 74 are charged during the period of current flow through diode 72 in such a direction that the H.T. supply from point 70 to the anode circuit of the driver stage 38 during its conductive periods is supplemented by the voltage across the capacitors. The linearity of the scan may be adjusted by variation of inductor 76 which resonates with capacitor 74 and may be adjusted to compensate for the deviation from flatness of the screen of the cathode-ray tube 56. The fly-back voltage developed across a pulse transformer 66 in the anode dircuit of valve 38 is rectified by diode 82 and smoothed to provide E.H.T. voltage for the final anode 78 of the cathode-ray tube. The stray capacitance 39 associated with the anode of valve 38 may be supplemented to lower the resonant frequency of the circuit comprising stray capacitances 39, 55, 57 and transformer winding 64 and thus improve the linearity of scan. Fig. 2 shows a modification in which the synchronizing signals from a television receiver 100 are separated in unit 104, and applied to line and frame saw-tooth generators 106, 108, respectively, H.T. supply being derived from a unit 110. The H.T. supply to the driver stage 38 from unit 110 is increased by the voltages produced across capacitors 62<SP>1</SP> and 74<SP>1</SP> as described in connection with Fig. 1. The capacitors 62<SP>1</SP>, 74<SP>1</SP> and wave shaping inductor 76<SP>1</SP> are associated with the end of the deflecting coils 54 which is at a low A.C. potential, thus obviating the necessity of filtering out the high voltage fly-back potential which is periodically present at end 58 of the coils.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90612A US2555831A (en) | 1949-04-30 | 1949-04-30 | Television deflection power recovery circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB672075A true GB672075A (en) | 1952-05-14 |
Family
ID=22223534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10526/50A Expired GB672075A (en) | 1949-04-30 | 1950-04-28 | Television deflection power recovery circuits |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US2555831A (en) |
| BE (1) | BE495378A (en) |
| CH (1) | CH291063A (en) |
| DE (1) | DE976252C (en) |
| ES (1) | ES192729A1 (en) |
| FR (1) | FR1017905A (en) |
| GB (1) | GB672075A (en) |
| NL (1) | NL153232C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2611106A (en) * | 1949-07-20 | 1952-09-16 | Motorola Inc | Television sweep system |
| US2708728A (en) * | 1950-09-28 | 1955-05-17 | Du Mont Allen B Lab Inc | Cathode-ray deflection circuit |
| US2707206A (en) * | 1950-12-08 | 1955-04-26 | Hazeltine Research Inc | Electromagnetic beam-deflection system for television receiver |
| NL177932B (en) * | 1952-05-03 | Maier Josef | CLOSING DEVICE FOR THE EDGES OF FORMWORK PLATES. | |
| US2817782A (en) * | 1954-07-09 | 1957-12-24 | Rca Corp | Cathode ray tube deflection apparatus |
| US2825846A (en) * | 1955-05-03 | 1958-03-04 | Motorola Inc | Color television receiver |
| US2809327A (en) * | 1955-11-17 | 1957-10-08 | Philco Corp | Horizontal magnetic deflection system for television receivers |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL45417C (en) * | 1934-09-29 | |||
| GB482370A (en) * | 1936-08-27 | 1938-03-28 | Eric Lawrence Casling White | Improvements in or relating to oscillatory electric circuits |
| CH221476A (en) * | 1938-11-15 | 1942-05-31 | Loewe Opta Gmbh | Arrangement for the electromagnetic deflection of the cathode ray in cathode ray tubes. |
| DE757933C (en) * | 1939-03-02 | 1953-06-15 | Telefunken Gmbh | Electric saw tooth generator |
| US2308908A (en) * | 1939-09-07 | 1943-01-19 | Bahring Herbert | Saw-tooth oscillator |
| US2370426A (en) * | 1943-03-29 | 1945-02-27 | Rca Corp | Electron tube circuit |
| US2470197A (en) * | 1946-09-25 | 1949-05-17 | Rca Corp | Electron beam deflection control system |
| US2443030A (en) * | 1946-11-09 | 1948-06-08 | Gen Electric | Picture size control circuit for television receivers |
-
0
- NL NL153232D patent/NL153232C/xx active
- BE BE495378D patent/BE495378A/xx unknown
-
1949
- 1949-04-30 US US90612A patent/US2555831A/en not_active Expired - Lifetime
-
1950
- 1950-04-13 FR FR1017905D patent/FR1017905A/en not_active Expired
- 1950-04-25 DE DER1572A patent/DE976252C/en not_active Expired
- 1950-04-26 CH CH291063D patent/CH291063A/en unknown
- 1950-04-27 ES ES0192729A patent/ES192729A1/en not_active Expired
- 1950-04-28 GB GB10526/50A patent/GB672075A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL153232C (en) | |
| US2555831A (en) | 1951-06-05 |
| ES192729A1 (en) | 1951-05-01 |
| BE495378A (en) | |
| DE976252C (en) | 1963-06-12 |
| CH291063A (en) | 1953-05-31 |
| FR1017905A (en) | 1952-12-22 |
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