Patent US1978857A successfully refreshed from Google Patents.
US4494145A
Expired / Lapsed
US
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Temperature compensation circuit in a pickup tube device
Assignee: Victor Company of Japan Ltd
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Filing: 1982-09-10
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Granted: 1985-01-15
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Expires: 2002-09-10
Abstract
Abstract A temperature compensation circuit in a pickup tube device comprising a pickup tube, a bias lighting device provided at the front surface of the pickup tube for irradiating a bias light, a circuit for generating a shading compensation signal, and a circuit for supplying a black gate pulse, comprises a temperature compensation signal generating circuit for generating a temperature compensation signal for cancelling variation in a signal current component from the pickup tube due to variation in the bias light obtained from the bias lighting device which is in accordance with temperature variation, a compensation signal obtaining circuit for obtaining a compensation signal by multiplexing the temperature compensation signal generated by the temperature compensation signal generating circuit with the shading compensation signal, and a mixing circuit for mixing the multiplexed compensation signal, the output signal of the pickup tube, and the black gate pulse.
Inventors
- 👤 Seigo Kokufukata
- 👤 Tetsuya Sekido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:29
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N23/00; H04N23/10; H04N23/13; H04N23/16; H04N23/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A temperature compensation circuit in a pickup tube device comprising a pickup tube, a bias lighting device provided at the front surface of said pickup tube for irradiating a bias light, a circuit for generating a shading compensation signal, and a circuit for supplying a black gate pulse, said temperature compensation circuit comprising: a temperature compensation signal generating circuit for generating a temperature compensation signal for cancelling variation in a signal current component from said pickup tube due to variation in the bias light obtained from said bias lighting device which is in accordance with temperature variation; means for obtaining a multiplexed compensation signal by multiplexing the temperature compensation signal generated by said temperature compensation signal generating circuit with said shading compensation signal; and a mixing circuit for mixing said multiplexed compensation signal, an output signal of said pickup tube, and said black gate pulse.
Claim 2
Dependent Claim
145 words
A temperature compensation circuit in a pickup tube device comprising a pickup tube, a bias lighting device provided at the front surface of said pickup tube for irradiating a bias light, a circuit for generating a shading compensation signal, and a circuit for supplying a black gate pulse, said temperature compensation circuit comprising: a temperature compensation signal generating circuit for generating a temperature compensation signal for cancelling variation in a signal current component from said pickup tube due to variation in the bias light obtained from said bias lighting device which is in accordance with temperature variation; means for obtaining a multiplexed compensation signal by multiplexing the temperature compensation signal generated by said temperature compensation signal generating circuit with said shading compensation signal; and a mixing circuit for mixing said multiplexed compensation signal, an output signal of said pickup tube, and said black gate pulse.
Claim 3
Dependent Claim
61 words
A temperature compensation circuit as claimed in claim 1 in which said bias lighting device comprises light-emitting diodes for irradiating the bias light, and said temperature compensation signal generating circuit comprises a temperature compensation element having a characteristic which varies with the temperature variation in accordance with the variation in the characteristic of said light-emitting diodes due to the temperature variation.
Claim 4
Dependent Claim
31 words
A temperature compensation circuit as claimed in claim 2 in which said temperature compensation element comprises a transistor having a diode characteristic equal to the temperature characteristic of said light-emitting diodes.
Claim 5
Dependent Claim
39 words
A temperature compensation circuit as claimed in claim 2 in which said temperature compensation element comprises a transistor and a thermistor connected to said transistor so that the base-bias voltage of said transistor varies according to the temperature variation.
Claim 6
Dependent Claim
61 words
A temperature compensation circuit as claimed in claim 1 in which said temperature compensation signal generating circuit comprises a first transistor for generating said temperature compensation signal, and a second transistor applied with a horizontal driving pulse having a period of one horizontal scanning period, for obtaining said temperature compensation signal for a predetermined period for every one horizontal scanning period.
Claim 7
Dependent Claim
47 words
A temperature compensation circuit as claimed in claim 5 in which the period in which said temperature compensation signal is obtained from said second transistor is a period in which said black gate pulse is mixed in said mixing circuit and a period in the vicinity thereof.
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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |