US4013845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensating reproducing system
Assignee: Panasonic Holdings Corp
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Filing: 1974-04-24
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Granted: 1977-03-22
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Expires: 1994-04-24
Abstract
Abstract A record reproducing system comprising a displacement detection type cartridge and a reproducing circuit for converting the output signal of the displacement detection type cartridge into audio signals. Either the displacement detection type cartridge or a pre-amplifier in the reproducing circuit is provided with a temperature sensitive resistive element so that temperature compensation with respect to the output-temperature characteristic of the displacement detection type cartridge may be effected at either the displacement detection type cartridge or the reproducing circuit.
Inventors
- 👤 Yukio Sugimoto
- 👤 Makoto Okamasa
- 👤 Toyoshi Fukumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A record reproducing system comprising a displacement detection type cartridge, said cartridge being provided with a bias current and producing an output signal having a magnitude which varies inversely with changes in ambient temperature; a reproducing circuit for converting said output signal into audio signals; and a bias circuit interposed between said cartridge and said reproducing circuit for varying the bias current of said cartridge in a direct relationship with changes in ambient temperature, said bias circuit including a temperature sensitive element having an electrical resistance which varies inversely with changes in the ambient temperature thereby compensating for the temperature characteristic of said cartridge and producing an output voltage which is substantially independent of changes in ambient temperature.
Claim 2
Dependent Claim
118 words
A record reproducing system comprising a displacement detection type cartridge, said cartridge being provided with a bias current and producing an output signal having a magnitude which varies inversely with changes in ambient temperature; a reproducing circuit for converting said output signal into audio signals; and a bias circuit interposed between said cartridge and said reproducing circuit for varying the bias current of said cartridge in a direct relationship with changes in ambient temperature, said bias circuit including a temperature sensitive element having an electrical resistance which varies inversely with changes in the ambient temperature thereby compensating for the temperature characteristic of said cartridge and producing an output voltage which is substantially independent of changes in ambient temperature.
Claim 3
Dependent Claim
30 words
A record reproducing system according to claim 1, wherein said bias circuit comprises of a series circuit consisting of a bias current setting resistor and said temperature sensitive resistive element.
Claim 4
Dependent Claim
30 words
A record reproducing system according to claim 1, wherein said bias circuit consists of a parallel circuit consisting of a bias current setting resistor and said temperature sensitive resistive element.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |