Patent US4138653A successfully refreshed from Google Patents.
US4138653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state tuner control
Assignee: STAMCOMP Inc
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Filing: 1972-08-31
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Granted: 1979-02-06
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Expires: 1992-08-31
Abstract
Abstract A television tuner arrangement is disclosed including a wide band signal selecting circuit having a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage and a channel selector control for controlling the voltage levels applied thereto. The control illustrated herein includes a selector, actuatable to a plurality of channel selection settings, a cylindrically shaped structure providing an external surface of conductive material, and a plurality of voltage taps radially disposed about the surface of the cylindrical structural and mounted for individual movement along the conductive material. A tuning voltage bus is connected to the wide band circuit and is selectively connectable to each of the taps. The cylindrically shaped structure and the taps are mounted for rotation about the axis of the structure and ganged to the selector so that a separate tap is connected to the bus for each channel selection setting.
Inventors
- 👤 Edward L. Midgley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:10
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/06; H03J1/066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
226 words
A multi-channel tuner including a VHF section and a UHF section, said tuner comprising: a. first switch means for switching power to either said VHF or UHF section of said tuner; b. said VHF section having a high frequency band and a low frequency band and said VHF section including a VHF coil having a first portion which is short-circuited when said VHF section is operating in said high frequency band; c. short-circuit switch means connected in parallel with said first portion of said VHF coil for short-circuiting said first portion when said VHF section is operating in said high frequency band; d. second switch means coupled between a power source and said short-circuit switch means for connecting said power source to said short-circuit switch means thereby changing the polarity across the short-circuit switch means whereby the state of said short-circuit switch means is reversed; e. tuning capacitor means comprising a variable capacitance element in said VHF section and in said UHF section of said tuner; f. a plurality of variable resistor means, coupled to said tuning capacitor means, for supplying a reverse bias to said tuning capacitor means; and g. third switch means for coupling only one of said plurality of variable resistor means to said variable capacitor means at a time, wherein said first, second and third switch means have a common operating shaft.
Claim 2
Dependent Claim
226 words
A multi-channel tuner including a VHF section and a UHF section, said tuner comprising: a. first switch means for switching power to either said VHF or UHF section of said tuner; b. said VHF section having a high frequency band and a low frequency band and said VHF section including a VHF coil having a first portion which is short-circuited when said VHF section is operating in said high frequency band; c. short-circuit switch means connected in parallel with said first portion of said VHF coil for short-circuiting said first portion when said VHF section is operating in said high frequency band; d. second switch means coupled between a power source and said short-circuit switch means for connecting said power source to said short-circuit switch means thereby changing the polarity across the short-circuit switch means whereby the state of said short-circuit switch means is reversed; e. tuning capacitor means comprising a variable capacitance element in said VHF section and in said UHF section of said tuner; f. a plurality of variable resistor means, coupled to said tuning capacitor means, for supplying a reverse bias to said tuning capacitor means; and g. third switch means for coupling only one of said plurality of variable resistor means to said variable capacitor means at a time, wherein said first, second and third switch means have a common operating shaft.
Claim 3
Dependent Claim
55 words
The multi-channel tuner as set forth in claim 1 wherein each variable resistor means corresponds to one channel of said tuner, said variable resistor means including selector means for varying the resistance of each of said variable capacitor means may be varied for each channel by varying the corresponding one of said variable resistor means.
Claim 4
Dependent Claim
299 words
A multi-channel tuner including a VHF section and a UHF section, said tuner comprising: first switch means for switching power to either said VHF or UHF section of said tuner; tuning capacitor means comprising first voltage variable diode capacitor means in said VHF section and second voltage variable diode capacitor means in said UHF section of said tuner; said VHF section having a high frequency band and a low frequency band and said VHF section including main inductance means coupled to said first voltage variable diode capacitor means to define a resonant frequency in one of said bands, additional inductance means, and voltage controllable switch means connected to said additional inductance means to operate in a first state to establish an operable circuit connection of said additional inductance means with said main inductance means to define a resonant frequency in the other of said bands and to operate in a second state to prevent said operable circuit connection of said additional inductance means with said main inductance means; said VHF section having means to apply a voltage of one polarity to said voltage controllable switch means to establish operation thereof in one of said states, second switch means coupled between a power source and said voltage controllable switch means for connecting said power source to said voltage controllable switch means thereby changing the polarity across the voltage controllable switch means whereby the state of said voltage controllable switch means is reversed; a plurality of variable resistor means, coupled to said tuning capacitor means, for supplying a reverse bias to said tuning capacitor means; and third switch means for coupling only one of said plurality of variable resistor means to said variable capacitor means at a time, wherein said first, second and third switch means have a common operating shaft.
Claim 5
Dependent Claim
299 words
A multi-channel tuner including a VHF section and a UHF section, said tuner comprising: first switch means for switching power to either said VHF or UHF section of said tuner; tuning capacitor means comprising first voltage variable diode capacitor means in said VHF section and second voltage variable diode capacitor means in said UHF section of said tuner; said VHF section having a high frequency band and a low frequency band and said VHF section including main inductance means coupled to said first voltage variable diode capacitor means to define a resonant frequency in one of said bands, additional inductance means, and voltage controllable switch means connected to said additional inductance means to operate in a first state to establish an operable circuit connection of said additional inductance means with said main inductance means to define a resonant frequency in the other of said bands and to operate in a second state to prevent said operable circuit connection of said additional inductance means with said main inductance means; said VHF section having means to apply a voltage of one polarity to said voltage controllable switch means to establish operation thereof in one of said states, second switch means coupled between a power source and said voltage controllable switch means for connecting said power source to said voltage controllable switch means thereby changing the polarity across the voltage controllable switch means whereby the state of said voltage controllable switch means is reversed; a plurality of variable resistor means, coupled to said tuning capacitor means, for supplying a reverse bias to said tuning capacitor means; and third switch means for coupling only one of said plurality of variable resistor means to said variable capacitor means at a time, wherein said first, second and third switch means have a common operating shaft.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |