US3623734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pick-up device for record players
Assignee: Panasonic Holdings Corp
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Filing: 1969-09-16
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Granted: 1971-11-30
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Expires: 1989-09-16
Abstract
Abstract A pickup device for record players which enables a stylus under a light pressure to perfectly trace the grooves on a disc even if the disc is warped or eccentric, whereby high-fidelity reproduction of the recorded sound can be obtained.
Inventors
- 👤 Naraji Sakamoto
- 👤 Toshiyuki Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:13
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/12; G11B3/125; H; H04; H04R; H04R9/00; H04R9/12; H04R9/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A pickup device for record players, comprising: a tone arm having a phonograph cartridge on one end; means detecting a differential from a predetermined normal relationship between said cartridge and a disc surface; means amplifying the difference signal detected by said detecting means; means operating to maintain said cartridge in said predetermined normal relationship; wherein said amplifying means drives said operating means in accordance with said detected signal and a feedback signal imparted through means, including a characteristic compensating circuit, for compensating the movement of said cartridge relative to said disc surface.
Claim 2
Dependent Claim
92 words
A pickup device for record players, comprising: a tone arm having a phonograph cartridge on one end; means detecting a differential from a predetermined normal relationship between said cartridge and a disc surface; means amplifying the difference signal detected by said detecting means; means operating to maintain said cartridge in said predetermined normal relationship; wherein said amplifying means drives said operating means in accordance with said detected signal and a feedback signal imparted through means, including a characteristic compensating circuit, for compensating the movement of said cartridge relative to said disc surface.
Claim 3
Dependent Claim
22 words
A pickup device according to claim 1, wherein said detector portion is a cartridge for reproducing the sound recorded on the disc.
Claim 4
Dependent Claim
30 words
A pickup device according to claim 1, wherein said detecting means comprises means for detecting the relationship between the disc and the cartridge by the displacement of said tone arm.
Claim 5
Dependent Claim
26 words
A pickup device according to claim 1, wherein said detecting means comprises means having a probe for detecting the relationship between the disc and the cartridge.
Claim 6
Dependent Claim
52 words
A pickup device according to claim 1, wherein said relationship between the disc and the pickup includes at least one of such factors as the pressure of the cartridge stylus exerted on the disc, the distance between the disc and the cartridge, and the velocity of the cartridge relative to the disc.
Claim 7
Dependent Claim
34 words
A pickup device according to claim 1, wherein the direction of said relationship includes at least one of a component vertical to the surface of the disc and a radial component of the disc.
Claim 8
Dependent Claim
35 words
A pickup device according to claim 1, wherein said relationship consists in a set of two directions forming an angle of 45* with respect to the surface of the disc and perpendicular to each other.
Claim 9
Dependent Claim
25 words
A pickup device according to claim 1, wherein said characteristic compensating circuit is at least one of the differential-integrating type and of the proportional type.
Claim 10
Dependent Claim
16 words
A pickup device according to claim 1, wherein said characteristic compensating circuit comprises a mechanical system.
Claim 11
Dependent Claim
17 words
A pickup device according to claim 1, wherein said amplifying means is an amplifier for reproducing sound.
Claim 12
Dependent Claim
46 words
A pickup device according to claim 1, further comprising means setting an upper limit to the frequency response of said operating means to prevent the response frequency of said operating means from reaching the audio range to reduce the output of sound in said audio range.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |