US4112337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage generator
Assignee: Hitachi Ltd
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Filing: 1976-12-03
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Granted: 1978-09-05
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Expires: 1996-12-03
Abstract
Abstract A high voltage generator suitable for use in a television receiver set wherein a frequency dependent attenuation circuit is connected to a primary winding of a flyback transformer which generates a high voltage to be supplied to a CRT whereby a regulation for a high voltage is improved.
Inventors
- 👤 Tadashi Nagasaki
- 👤 Mitsuharu Akatsu
- 👤 Mitsuo Ohtsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:09
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/185
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
A high voltage generator comprising: a horizontal output circuit for generating a flyback pulse during a retrace period of horizontal scan, a flyback transformer having primary and secondary windings for stepping up said flyback pulse, a rectifying circuit for rectifying the steeped-up voltage for supplying a D.C. voltage to a CRT, a frequency dependent attenuation circuit connected in series with said primary winding of said flyback transformer for causing substantial power loss in a harmonic component in a high voltage output waveform of said flyback transformer while causing substantially no power loss in a fundamental component of the high voltage output waveform, and said attenuation circuit attenuating the harmonic component in the high voltage output waveform of said flyback transformer to flatten the top of the retrace pulse waveform of the high voltage output.
Claim 2
Dependent Claim
134 words
A high voltage generator comprising: a horizontal output circuit for generating a flyback pulse during a retrace period of horizontal scan, a flyback transformer having primary and secondary windings for stepping up said flyback pulse, a rectifying circuit for rectifying the steeped-up voltage for supplying a D.C. voltage to a CRT, a frequency dependent attenuation circuit connected in series with said primary winding of said flyback transformer for causing substantial power loss in a harmonic component in a high voltage output waveform of said flyback transformer while causing substantially no power loss in a fundamental component of the high voltage output waveform, and said attenuation circuit attenuating the harmonic component in the high voltage output waveform of said flyback transformer to flatten the top of the retrace pulse waveform of the high voltage output.
Claim 3
Dependent Claim
24 words
A high voltage generator according to claim 1 wherein said attenuation circuit comprises a parallel circuit of an inductor, a capacitor and a resistor.
Claim 4
Dependent Claim
33 words
A high voltage generator according to claim 1 wherein said attenuation circuit comprises an LC parallel resonance circuit of an inductor and a capacitor, and a resistor connected in series with said capacitor.
Claim 5
Dependent Claim
22 words
A high voltage generator according to claim 1 wherein said attenuation circuit comprises a parallel circuit of an inductor and a resistor.
Claim 6
Dependent Claim
97 words
A high voltage generator comprising: a horizontal output circuit for generating a flyback pulse during a retrace period of a horizontal scan, a flyback transformer having primary and secondary windings for stepping up said flyback pulse, a rectifying circuit for rectifying the stepped-up voltage for supplying a D.C. voltage to a CRT, a frequency dependent attenuation circuit connected intermediate said primary windings of said flyback transformer, and said attenuation circuit attenuating harmonic component in a high voltage output waveform of said flyback transformer to flatten the top of the retrace pulse waveform of the high voltage output.
Claim 7
Dependent Claim
97 words
A high voltage generator comprising: a horizontal output circuit for generating a flyback pulse during a retrace period of a horizontal scan, a flyback transformer having primary and secondary windings for stepping up said flyback pulse, a rectifying circuit for rectifying the stepped-up voltage for supplying a D.C. voltage to a CRT, a frequency dependent attenuation circuit connected intermediate said primary windings of said flyback transformer, and said attenuation circuit attenuating harmonic component in a high voltage output waveform of said flyback transformer to flatten the top of the retrace pulse waveform of the high voltage output.
Claim 8
Dependent Claim
24 words
A high voltage generator according to claim 1, wherein said attenuation circuit is directly connected between said primary winding and a source of power.
Claim 9
Dependent Claim
23 words
A high voltage generator according to claim 1, wherein said attenuation circuit comprises an inductor, a capacitor and a resistor connected in parallel.
Claim 10
Dependent Claim
36 words
A high voltage generator according to claim 1, wherein said attenuation circuit comprises a resistor connected in series with a capacitor, the series circuit of the resistor and capacitor being connected in parallel with an inductor.
Claim 11
Dependent Claim
21 words
A high voltage generator according to claim 1, wherein said attenuation circuit comprises a resistor connected in parallel with an inductor.
Claim 12
Dependent Claim
48 words
A high voltage generator according to claim 5, wherein said frequency dependent attenuation circuit causes substantial power loss in a harmonic component in a high voltage output waveform of said flyback transformer while causing substantially no power loss in a fundamental component in the high voltage output waveform.
Claim 13
Dependent Claim
23 words
A high voltage generator according to claim 5, wherein said attenuation circuit comprises an inductor, a capacitor and a resistor connected in parallel.
Claim 14
Dependent Claim
21 words
A high voltage generator according to claim 5, wherein said attenuation circuit comprises an inductor and a resistor connected in parallel.
Claim 15
Dependent Claim
23 words
A high voltage generator according to claim 5, wherein said attenuation circuit is connected in series between two portions of said primary winding.
Claim 16
Dependent Claim
20 words
A high voltage generator according to claim 13, wherein said attenuation circuit includes at least a resistor and an inductor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |