Patent US3764754A successfully refreshed from Google Patents.
US3764754A
Expired / Lapsed
US
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Circuit bilaterally employable in cartridge type tape recorder for two channel and four channel operations
Assignee: Alpine Electronics Inc
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Filing: 1972-04-11
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Granted: 1973-10-09
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Expires: 1992-04-11
Abstract
Abstract Two to four channel switching circuitry for a cartridge tape player using a magnetic tape head having four pick-up areas and which is movable to two positions with respect to the tape tracks on the tape in a cartridge received in the player includes four amplifier circuits, each associated with a pick-up area on the tape head and each of which is coupled to a speaker. A switch is operated in accordance with the receipt of a two or four channel cartridge in the player to connect two of the speakers to a first amplifier circuit and the other two speakers to a second amplifier circuit when in the two channel mode or each of the amplifier circuits to a corresponding one of the speakers when in the four channel mode. In the two channel mode, operation of the amplifier circuits is controlled by a rotary switch rotatable with a cam member included in a tape head indexing assembly. A first or second pair of amplifier circuits is activated in the two channel mode in accordance with the position of the rotary switch wiper.
Inventors
- 👤 Y Mizumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/49; G11B5/4969; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
399 words
A cartridge type tape player adapted to receive and play two and four channel tape cartridges including in combination, a magnetic tape head having four magnetic pick-up areas, tape head indexing means for moving said tape head to one of two positions with respect to the tape for aligning said pick-up areas with predetermined tape channels thereon, amplifier means including four amplifier circuits each connected to one of said pick-up areas on said tape head and to an output for receiving signals from said amplifier circuit for audible reproduction, each said amplifier circuit including an electron control valve having an input connected to a respective magnetic pick-up and an output, a plurality of unidirectional current conducting devices, each device being connected between a respective output of one of said electron valves and an associated output for audio reproduction, switching means coupled to said electron control valves and having a first portion operable between first and second positions in accordance with the receipt of said two or four channel tape cartridges in said player respectively, and a second portion operable between one of two predetermined positions by said tape head indexing means, with movement of said first portion of said switching means to said second position in response to the receipt of a four channel cartridge in said player, each said electron control valve is energized through said switch means thereby forward biasing said unidirectional current conducting device to pass output signals from each of said respective amplifier circuits, and with movement of said first portion of said switching means to said first position in response to the receipt of a two channel cartridge in said player, and operation of said second portion of said switching means to a first predetermined position by said head indexing means energizes a first pair of said electron control valves through said switch means thereby forward biasing each said unidirectional current conducting device connected to said first pair of electron control valves to pass output signals from each of said respective amplifier circuits, and operation of said second portion of said switching means to said second predetermined position by said head indexing means energizes the other pair of electron control valves through said switch means thereby forward biasing each said unidirectional current conducting device connected to said second pair of electron control valves to pass output signals from each of theIr respective amplifier circuits.
Claim 2
Dependent Claim
399 words
A cartridge type tape player adapted to receive and play two and four channel tape cartridges including in combination, a magnetic tape head having four magnetic pick-up areas, tape head indexing means for moving said tape head to one of two positions with respect to the tape for aligning said pick-up areas with predetermined tape channels thereon, amplifier means including four amplifier circuits each connected to one of said pick-up areas on said tape head and to an output for receiving signals from said amplifier circuit for audible reproduction, each said amplifier circuit including an electron control valve having an input connected to a respective magnetic pick-up and an output, a plurality of unidirectional current conducting devices, each device being connected between a respective output of one of said electron valves and an associated output for audio reproduction, switching means coupled to said electron control valves and having a first portion operable between first and second positions in accordance with the receipt of said two or four channel tape cartridges in said player respectively, and a second portion operable between one of two predetermined positions by said tape head indexing means, with movement of said first portion of said switching means to said second position in response to the receipt of a four channel cartridge in said player, each said electron control valve is energized through said switch means thereby forward biasing said unidirectional current conducting device to pass output signals from each of said respective amplifier circuits, and with movement of said first portion of said switching means to said first position in response to the receipt of a two channel cartridge in said player, and operation of said second portion of said switching means to a first predetermined position by said head indexing means energizes a first pair of said electron control valves through said switch means thereby forward biasing each said unidirectional current conducting device connected to said first pair of electron control valves to pass output signals from each of said respective amplifier circuits, and operation of said second portion of said switching means to said second predetermined position by said head indexing means energizes the other pair of electron control valves through said switch means thereby forward biasing each said unidirectional current conducting device connected to said second pair of electron control valves to pass output signals from each of theIr respective amplifier circuits.
Claim 3
Dependent Claim
58 words
The cartridge tape player of claim 1 wherein said electron control valve is a transistor having input, output and common electrodes, and said unidirectional current conducting device is a diode, said input electrode being connected to one of said magnetic pick-up areas, said output electrode connected to said diode and said common electrode connected to said switch means.
Claim 4
Dependent Claim
64 words
The cartridge tape player of claim 2 further including in combination, bias circuit means connected to each of said transistor and diode, said common electrode of each said transistor being selectively connected through said switch means to complete a circuit thereby causing bias current to flow from said bias circuit means and through said transistor and said switch means to forward bias said diode.
Claim 5
Dependent Claim
88 words
The cartridge tape player of claim 2 wherein with said two channel cartridge being inserted in said player, said head indexing means operates said second portion of said switching means to said first predetermined position, with said tape head being moved by said head indexing means to said second position from said first position, and said head indexing means operates said second portion of said switching means to said second predetermined position with said head indexing means next moving said tape head to said first and second positions.
Claim 6
Dependent Claim
102 words
The cartridge tape player of claim 4 wherein with said two channel cartridge being inserted in said player, said first portion of said switching means is operated to connect the remaining two outputs for receiving signals from said amplifier circuits to respective ones of said pair of amplifier circuits connected to said first pair of transistors with said second portion of said switching means in said first predetermined position, and said remaining two outputs being connected to said pair of amplifier circuits connected to said second pair of transistors with said second portion of said switching means in said second predetermined 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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |