US3986077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical deflection circuit
Assignee: Sanyo Electric Co Ltd
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Filing: 1974-11-22
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Granted: 1976-10-12
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Expires: 1994-11-22
Abstract
Abstract In a vertical deflection circuit for use in a television receiver or the like comprising a vertical oscillation circuit, a saw-tooth wave voltage generating circuit connected to the vertical oscillation circuit and a vertical deflection output circuit to which the output from the sawtooth wave voltage generating circuit is supplied, a capacitance circuit or a clamp circuit is advantageously incorporated in the vertical deflection circuit in order to eliminate bad effects on the interlaced scanning arising from the linearity correction loop.
Inventors
- 👤 Takeshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:35
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/72; H03K4/725
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
209 words
A vertical deflection circuit in which a horizontal signal component synchronized with the horizontal synchronizing signal is applied to a vertical deflection output, said circuit comprising a vertical oscillation circuit for generating a vertical output pulse train in response to vertical synchronizing pulses applied thereto, a saw-tooth wave voltage generator which produces a series of saw-tooth signals in response to said vertical output pulses, a vertical output circuit for amplifying said saw-tooth signals and loading a vertical deflection coil, and a negative current feedback path for vertical linearity correction provided between said vertical output circuit and said saw-tooth wave voltage generator, said saw-tooth wave voltage generator including a switching circuit to be switched in response to said vertical output pulses from said vertical oscillation circuit, a first capacitor for the saw-tooth signal formation wherein said first capacitor is repeatedly charged or discharged in response to said switching circuit and wherein output signals from said vertical output circuit are applied through said negative current feedback path to said first capacitor, and a clamping circuit connected in parallel to said first capacitor for clamping the saw-tooth voltage formed by said first capacitor for a very short period of time including the completion time of the retracing period of said vertical deflection.
Claim 2
Dependent Claim
209 words
A vertical deflection circuit in which a horizontal signal component synchronized with the horizontal synchronizing signal is applied to a vertical deflection output, said circuit comprising a vertical oscillation circuit for generating a vertical output pulse train in response to vertical synchronizing pulses applied thereto, a saw-tooth wave voltage generator which produces a series of saw-tooth signals in response to said vertical output pulses, a vertical output circuit for amplifying said saw-tooth signals and loading a vertical deflection coil, and a negative current feedback path for vertical linearity correction provided between said vertical output circuit and said saw-tooth wave voltage generator, said saw-tooth wave voltage generator including a switching circuit to be switched in response to said vertical output pulses from said vertical oscillation circuit, a first capacitor for the saw-tooth signal formation wherein said first capacitor is repeatedly charged or discharged in response to said switching circuit and wherein output signals from said vertical output circuit are applied through said negative current feedback path to said first capacitor, and a clamping circuit connected in parallel to said first capacitor for clamping the saw-tooth voltage formed by said first capacitor for a very short period of time including the completion time of the retracing period of said vertical deflection.
Claim 3
Dependent Claim
72 words
A vertical deflection circuit as claimed in claim 1, wherein said clamping circuit means comprises a switching element to be rendered conductive for said very short period of time including said completion time of the retracing period of said vertical deflection, and a second capacitor for stabilizing said saw-tooth signal which second capacitor is connected in parallel to all or part of said first capacitor when said switching element is rendered conductive.
Claim 4
Dependent Claim
64 words
A vertical deflection circuit as claimed in claim 2, wherein said clamping circuit means further includes a resistance which is connected in parallel to said second capacitor and which is adapted, together with said second capacitor, to set the conducting time of said switching element to said very short period of time including said completion time of the retracing period of said vertical deflection.
Claim 5
Dependent Claim
45 words
A vertical deflection circuit as claimed in cliam 3, wherein said clamping circuit means further includes a capacitor and a resistance in a series connection to each other and parallel to said second capacitor for preventing the vibration of a picture due to transient phenomenon.
Claim 6
Dependent Claim
64 words
A vertical deflection circuit as claimed in claim 2, wherein said clamping circuit means further includes a resistance which is connected in parallel to said switching element, and which is adapted, together with said second capacitor, to set the conducting time of said switching element to said very short period of time including said completion time of the retracing period of said vertical deflection.
Claim 7
Dependent Claim
44 words
A vertical deflection circuit as claimed in claim 2, wherein said clamping circuit means further includes a third capacitor connected in parallel to one of the divided resistors connected in parallel to said second capacitor for preventing vibration of picture due to transient phenomenon.
Claim 8
Dependent Claim
62 words
A vertical deflection circuit as claimed in claim 1, wherein said clamping circuit means comprises a switching element to be rendered conductive in said very short period of time including said completion time of the retracing period of said vertical deflection and a constant voltage compensator for supplying a constant voltage to said first capacitor when said switching element is rendered conductive.
Claim 9
Dependent Claim
24 words
A vertical deflection circuit as claimed in claim 7, wherein said constant voltage compensator for said clamping circuit means comprises a constant voltage source.
Claim 10
Dependent Claim
23 words
A vertical deflection circuit as claimed in claim 7, wherein said constant voltage compensator for said clamping circuit means comprises a Zenor diode.
Claim 11
Dependent Claim
37 words
A vertical deflection circuit as claimed in claim 7, wherein said switching element and said constant voltage compensator are connected in series to each other and in parallel to said first capacitor for the saw-tooth signal formation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |