Patent US4422735A successfully refreshed from Google Patents.
US3573684A
Expired / Lapsed
US
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Tuner for a wave signal receiver
Assignee: Zenith Electronics LLC
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Filing: 1969-02-28
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Granted: 1971-04-06
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Expires: 1989-02-28
Abstract
Abstract A variable amplitude DC control voltage, for tuning varactordiode type tunable circuitry, is developed by a lightcontrollable voltage source having a light-sensitive device, such as a light-dependent resistor, exposed to an adjustable amount of light. In response to different discrete light levels, the control voltage assumes different discrete amplitude levels which in turn effect tuning to different broadcast channels.
Inventors
- 👤 George R Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:56
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03J5/0209; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
193 words
A tuner for selectively tuning a wave-signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including a pair of lightdependent resistors and a source of unidirectional potential for providing, in response to incident light received by said resistors, a voltage of a magnitude determined by the amount of such incident light; control means for exposing said light-sensitive resistors to a controllable amount of light to effect the development, by said light-controllable source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; and tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the controlvoltage amplitude level at the time, in which said two lightdependent resistors and said source of unidirectional potential are series connected and said control voltage is derived at the junction of the two light-dependent resistors, and in which said control means exposes both of said light-dependent resistors to variable quantities of light, the amount striking each resistor being inversely proportional to that impinging the other.
Claim 2
Dependent Claim
193 words
A tuner for selectively tuning a wave-signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including a pair of lightdependent resistors and a source of unidirectional potential for providing, in response to incident light received by said resistors, a voltage of a magnitude determined by the amount of such incident light; control means for exposing said light-sensitive resistors to a controllable amount of light to effect the development, by said light-controllable source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; and tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the controlvoltage amplitude level at the time, in which said two lightdependent resistors and said source of unidirectional potential are series connected and said control voltage is derived at the junction of the two light-dependent resistors, and in which said control means exposes both of said light-dependent resistors to variable quantities of light, the amount striking each resistor being inversely proportional to that impinging the other.
Claim 3
Dependent Claim
187 words
A tuner for selectively tuning a wave signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including at least one light-sensitive device for providing, in response to incident light received by said device, a voltage of a magnitude determine by the amount of such incident light; control means for exposing said light-sensitive device to a controllable amount of light to effect the development, by said source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the control-voltage amplitude level at the time; and said tuner having a plurality of different positions, in which said control means includes an adjustable mechanism for selecting the amount of light falling on said light-sensitive device in each tuner position, thereby to permit the adjustment of the control voltage amplitude to a different level in each position to achieve tuning to a different channel in each position.
Claim 4
Dependent Claim
187 words
A tuner for selectively tuning a wave signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including at least one light-sensitive device for providing, in response to incident light received by said device, a voltage of a magnitude determine by the amount of such incident light; control means for exposing said light-sensitive device to a controllable amount of light to effect the development, by said source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the control-voltage amplitude level at the time; and said tuner having a plurality of different positions, in which said control means includes an adjustable mechanism for selecting the amount of light falling on said light-sensitive device in each tuner position, thereby to permit the adjustment of the control voltage amplitude to a different level in each position to achieve tuning to a different channel in each position.
Claim 5
Dependent Claim
199 words
A tuner for selectively tuning a wave signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including at least one light-sensitive device for providing, in response to incident light received by said device, a voltage of a magnitude determined by the amount of such incident light; control means for exposing said light-sensitive device to a controllable amount of light to effect the development, by said source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the control-voltage amplitude level at the time; said tuner being step-by-step actuatable from one to another of a series of discrete tuner positions in each of which a different respective assigned one of a corresponding series of adjustable controls, included in said control means, is effective and may be preset to select the amount of light to be received by said light-sensitive device in that position, thereby facilitating preset tuning to a different selected channel in each tuner position.
Claim 6
Dependent Claim
199 words
A tuner for selectively tuning a wave signal receiver to any one of several different broadcast channels, comprising: a light-controllable voltage source including at least one light-sensitive device for providing, in response to incident light received by said device, a voltage of a magnitude determined by the amount of such incident light; control means for exposing said light-sensitive device to a controllable amount of light to effect the development, by said source, of a control voltage whose amplitude is variable as between several different discrete amplitude levels each of which is assigned to, and effectively designates, a different respective one of said channels; tunable means responsive to said control voltage for tuning said receiver to the particular channel designated by the control-voltage amplitude level at the time; said tuner being step-by-step actuatable from one to another of a series of discrete tuner positions in each of which a different respective assigned one of a corresponding series of adjustable controls, included in said control means, is effective and may be preset to select the amount of light to be received by said light-sensitive device in that position, thereby facilitating preset tuning to a different selected channel in each tuner position.
Claim 7
Dependent Claim
46 words
A tuner according to claim 3 in which said control means includes a common movable element, effective in all tuner positions, for controlling the light exposure of said light-sensitive device and which is positionable, in each tuner position, by the adjustable control assigned to that position.
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |