US4371961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive information system
Assignee: RCA Corp
•
Filing: 1980-11-21
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Granted: 1983-02-01
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Expires: 2000-11-21
Abstract
Abstract An improved information storage and recovery system comprising a playback stylus, having a dielectric support element and a conductive electrode, and a grooved conductive disc record in which information is recorded. The information is recovered on playback while there is relative motion between the record surface and the stylus by sensing capacitive variations between the stylus conductive electrode and the record surface. The improvement comprises employing that angle between the electrode face and the record surface such that the respective paths of dielectric effects between the electrode face and the record surface both in the direction of relative motion and in the direction opposite the direction of relative motion are balanced.
Inventors
- 👤 Gerald D. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:19
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/06; G11B9/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
In an information storage and recovery system which comprises a playback stylus, having a dielectric support element and a conductive electrode, and a grooved conductive record disc, in which information is recorded, wherein the information is recovered on playback while there is relative motion between the record surface and the stylus by sensing capacitive variations between the stylus conductive electrode and the record surface; wherein the improvement comprises employing that angle between the electrode face and the record surface such that the respective paths of dielectric effects between the electrode face and the record surface in the direction of relative motion and in the direction opposite the direction of relative motion are balanced.
Claim 2
Dependent Claim
113 words
In an information storage and recovery system which comprises a playback stylus, having a dielectric support element and a conductive electrode, and a grooved conductive record disc, in which information is recorded, wherein the information is recovered on playback while there is relative motion between the record surface and the stylus by sensing capacitive variations between the stylus conductive electrode and the record surface; wherein the improvement comprises employing that angle between the electrode face and the record surface such that the respective paths of dielectric effects between the electrode face and the record surface in the direction of relative motion and in the direction opposite the direction of relative motion are balanced.
Claim 3
Dependent Claim
18 words
An information storage and recovery system in accordance with claim 1 wherein the dielectric support element is diamond.
Claim 4
Dependent Claim
20 words
An information storage and recovery system in accordance with claim 1 or claim 2 wherein the playback stylus is keel-tipped.
Claim 5
Independent Claim
140 words
A method for diminishing the sound beat in the video portion of a signal recovered by a grooved capacitive information storage and recovery system comprising a record disc, in which information is recorded, and a playback stylus, having a dielectric support element having a conductive electrode and a shoe which engages the record disc, which comprises the steps of: rotating the record disc so that there is relative motion between the record surface and the playback stylus, employing that angle between the conductive electrode face and the conductive record disc surface such that the respective paths of dielectric effects between the electrode face and the record disc surface both in the direction of relative motion and in the direction opposite the direction of relative motion are balanced, and sensing capacitive variations between the stylus conductive electrode and the record surface.
Claim 6
Independent Claim
140 words
A method for diminishing the sound beat in the video portion of a signal recovered by a grooved capacitive information storage and recovery system comprising a record disc, in which information is recorded, and a playback stylus, having a dielectric support element having a conductive electrode and a shoe which engages the record disc, which comprises the steps of: rotating the record disc so that there is relative motion between the record surface and the playback stylus, employing that angle between the conductive electrode face and the conductive record disc surface such that the respective paths of dielectric effects between the electrode face and the record disc surface both in the direction of relative motion and in the direction opposite the direction of relative motion are balanced, and sensing capacitive variations between the stylus conductive electrode and the record surface.
Claim 7
Dependent Claim
37 words
A method in accordance with claim 4 wherein the dielectric effect paths are balanced by lapping a dielectric support element face so that the desired angle between the conductive electrode face and the stylus shoe is obtained.
Claim 8
Dependent Claim
23 words
A method in accordance with claim 4 wherein the angle employed to balance the dielectric effect paths is obtained by tilting the stylus.
Claim 9
Dependent Claim
35 words
A method in accordance with claim 4 wherein the dielectric effect paths are balanced by lapping the stylus shoe so that the desired angle between the conductive electrode face and the stylus shoe is obtained.
References Cited (Backward Citations)
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |