US3689079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phonograph utilizing a rotational angle detector for sound track selection
Assignee: Nippon Columbia Co Ltd
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Filing: 1968-12-24
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Granted: 1972-09-05
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Expires: 1988-12-24
Abstract
Abstract A sound track selection phonograph comprises a pick-up arm rotational angle detector mounted on a rotary shaft of the pickup arm. The output signal of the detector is divided into a plurality of signals during one turn of a record, and those divided signals are memorized and compared to a plurality of divided output signals obtained by the rotational angle detector in the next succeeding turn of the record, thereby to ascertain the difference between the signals to produce a detecting signal.
Inventors
- 👤 Hitoshi Matsuda
- 👤 Hideaki Hayashi
- 👤 Tetsuro Araki
- 👤 Shinichi Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:58
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/08; G11B3/095; G11B3/085; G11B3/08503; G11B3/08506; G11B3/08512
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
153 words
In a sound track selection phonograph of the type having a pickup arm mounted for rotational movement, a rotary shaft mounted for corotation with the pickup arm, and a rotatable turntable adapted to rotate a grooved record medium which is scanned by the pickup arm, pickup arm rotational angle detecting means comprising: detecting means associated with the rotary shaft and producing an output signal varying as a function of the angular displacement of the pickup arm as the same scans a record; means for dividing the output signal of said detecting means into a plurality of signals during one revolution of the turntable; means for storing the divided output signals; and means for comparing a plurality of divided output signals produced by said detecting means in a next succeeding revolution of the turntable with the signals previously stored by said storing means to ascertain the differences between the signals and producing detecting signals.
Claim 2
Dependent Claim
153 words
In a sound track selection phonograph of the type having a pickup arm mounted for rotational movement, a rotary shaft mounted for corotation with the pickup arm, and a rotatable turntable adapted to rotate a grooved record medium which is scanned by the pickup arm, pickup arm rotational angle detecting means comprising: detecting means associated with the rotary shaft and producing an output signal varying as a function of the angular displacement of the pickup arm as the same scans a record; means for dividing the output signal of said detecting means into a plurality of signals during one revolution of the turntable; means for storing the divided output signals; and means for comparing a plurality of divided output signals produced by said detecting means in a next succeeding revolution of the turntable with the signals previously stored by said storing means to ascertain the differences between the signals and producing detecting signals.
Claim 3
Dependent Claim
48 words
In a sound track selection phonograph as defined in claim 1, said means for dividing the output of said detecting means comprising magnet means mounted on the turntable and a plurality of reed switches stationarily mounted around the turntable at regular intervals for actuation by said magnet means.
Claim 4
Dependent Claim
36 words
In a sound track selection phonograph as defined in claim 1, said means for comparing the plurality of divided output signals comprising a plurality of systems for comparing the divided output signals and the stored signals.
Claim 5
Dependent Claim
36 words
In a sound track selection phonograph as defined in claim 1, said means for comparing the differences of the divided output signals during a next succeeding revolution of the turntable comprising a capacitor and a resistor.
Claim 6
Dependent Claim
29 words
In a sound track selection phonograph as defined in claim 1, wherein the output derived from said comparing means is applied to a monostable multivibrator through a Schmitt circuit.
Claim 7
Dependent Claim
99 words
A sound track selection phonograph as claimed in claim 1 wherein the means for dividing the output of the pickup arm rotational angle detecting means into a plurality of signals during one turn of the record consists of a clock pulse oscillator synchronized with the revolving cycle of the record, a frequency demultiplier supplied with the output of the clock pulse oscillator for producing timing pulses sequentially displaced Apart in phase and means for applying the output of the frequency demultiplier to a plurality of gate circuits for sampling the output of the pickup arm rotational angle detecting means.
Claim 8
Dependent Claim
47 words
A sound track selection phonograph as claimed in claim 6 wherein the means for memorizing the outputs of the sampling means and the means for comparing the sampled outputs respectively consist of capacitors connected to the gate circuits and a resistor connected in common to the capacitors.
Claim 9
Dependent Claim
87 words
In a sound track selection phonograph as defined in claim 1, said means for dividing the output signal of said detecting means comprising a clock pulse oscillator synchronized with the rotational movement of the turntable; a frequency demultiplier receiving an output of said clock pulse oscillator and producing timing pulses sequentially displaced apart in phase, means forming a plurality of gate circuits, and means for applying the output of said frequency multiplier to said plurality of gate circuits for sampling the output signal of said detecting means.
Claim 10
Dependent Claim
46 words
In a sound track selection phonograph as defined in claim 8, said means for storing the output of said sampling means, and said means for comparing the sampled outputs respectively comprising capacitors connected to said gate circuits and a resistor connected in common with said capacitors.
Claim 11
Dependent Claim
51 words
In a sound track selection phonograph as defined in claim 1, said means for dividing the output of said detecting means comprising a plurality of reed switches mounted on the turntable and circumferentially spaced therearound at regular intervals, and magnet means stationarily mounted adjacent the turntable for actuating said reed switches.
Claim 12
Dependent Claim
47 words
In a sound track selection phonograph as defined in claim 10, said means for storing the outputs of said sampling means and said means for comparing the sampled outputs respectively comprising capacitors respectively connected to said reed switches and a resistor connected in common to said capacitors.
Claim 13
Dependent Claim
65 words
In a sound track selection phonograph as defined in claim 1, said detecting means comprising: first polarizing plate means pivotally mounted on the rotary shaft; second polarizing plate means secured to a stationary part; a light source; photoelectric conversion means, said light source and said photoelectric conversion means being disposed in opposed relationship to each other with said first and second polarizing plate means therebetween.
Claim 14
Dependent Claim
45 words
In a sound track selection phonograph as defined in claim 12, said first and said second polarizing plate means being arranged so that an angle between their main axes varies in a range of 0 to 90* with the angular displacement of the rotary shaft.
Claim 15
Dependent Claim
31 words
In a sound track selection phonograph as defined in claim 12, means mounting said photoelectric conversion means on the rotary shaft, and means mounting said light source on a stationary part.
Claim 16
Dependent Claim
31 words
In a sound track selection phonograph as defined in claim 12, means mounting said light source on the rotary shaft and means mounting said photoelectric conversion means on a stationary part.
Claim 17
Dependent Claim
107 words
In a sound track selection phonograph as defined in claim 12, said second polarizing plate means comprising a pair of second polarizing plates disposed on substantially the same plane and arranged so that the main axis of either one of said second polarizing plates extends parallel with the axis of said first polarizing plate means, with the main axis of the other one of said second polarizing plates extending substantially at right angles to the main axis of said first polarizing plate means, and said photoelectric conversion means comprising a pair of photoelectric conversion elements respectively disposed in opposed relationship to said pair of second polarizing plates.
Claim 18
Dependent Claim
30 words
In a sound track selection phonograph as defined in claim 16, means mounting respective ones of said second polarizing plates on opposite ones of said pair of photoelectric conversion elements.
Claim 19
Dependent Claim
31 words
In a sound track selection phonograph as defined in claim 16, means electrically connecting said pair of photoelectric conversion elements to each other in a manner to produce a differential signal.
Claim 20
Dependent Claim
108 words
In a sound track selection phonograph as defined in claim 12, said first polarizing plate means comprising a pair of first polarizing plates disposed on substantially the same plane and arranged so that the main axis of either one of said first polarizing plates extends parallel of the main axis of said second polarizing plate means, with the main axis of the other one of said first polarizing plates extending substantially at right angles to the main axis of said second polarizing plate means, and said photoelectric conversion means comprising a pair of photoelectric conversion elements respectively disposed in opposed relationship to said pair of first polarizing plates.
Claim 21
Dependent Claim
22 words
In a sound track selection phonograph as recited in claim 19, means attaching said second polarizing plate means to said light source.
Claim 22
Dependent Claim
31 words
In a sound track selection phonograph as defined in claim 19, means electrically connecting said pair of photoelectric conversion elements to each other in a manner to produce a differential signal.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |