US3835262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video disc cutting using pressurized air to control depth of grooves
Assignee: Zenith Electronics LLC
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Filing: 1973-06-04
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Granted: 1974-09-10
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Expires: 1993-06-04
Abstract
Abstract A method and apparatus for controlling the depth to which grooves are cut in a master video recording disc. Pressurized air is directed toward the surface of the disc in order to lift and maintain a cutting stylus assembly at a predetermined height above the surface of the disc, thereby assuring that the grooves will be cut to a predetermined reference depth.
Inventors
- 👤 S Moritz
- 👤 E Polley
- 👤 W Puls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:03
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A method of cutting a video recording disc master comprising: rotating the disc at a predetermined speed with the stylus in cutting position on the disc; vibrating the stylus in response to a video information bearing signal for imparting to a groove a varying contour which corresponds to the information to be recorded; directing a laminar flow Of gas under pressure downwardly onto an uncut portion of the disc substantially adjacent to the stylus; and controlling the pressure of the gas to control the spatial relationship between the stylus cutting tip and the surface of the disc in order to control the reference depth to which the grooves are cut.
Claim 2
Independent Claim
110 words
A method of cutting a video recording disc master comprising: rotating the disc at a predetermined speed with the stylus in cutting position on the disc; vibrating the stylus in response to a video information bearing signal for imparting to a groove a varying contour which corresponds to the information to be recorded; directing a laminar flow Of gas under pressure downwardly onto an uncut portion of the disc substantially adjacent to the stylus; and controlling the pressure of the gas to control the spatial relationship between the stylus cutting tip and the surface of the disc in order to control the reference depth to which the grooves are cut.
Claim 3
Dependent Claim
97 words
Video disc cutting apparatus for cutting grooves in a rotating master recording disc comprising: a cutting stylus for cutting grooves in the disc; a transducer mechanically coupled to the stylus for imparting vibratory motion to the stylus in response to an electrical signal input; and means rigidly coupled to the stylus for directing a laminar flow of gas onto an uncut portion of the disc at a pressure and rate effective to lift the apparatus a predetermined distance above the disc surface so as to cause the stylus to cut the grooves to a predetermined reference depth.
Claim 4
Dependent Claim
97 words
Video disc cutting apparatus for cutting grooves in a rotating master recording disc comprising: a cutting stylus for cutting grooves in the disc; a transducer mechanically coupled to the stylus for imparting vibratory motion to the stylus in response to an electrical signal input; and means rigidly coupled to the stylus for directing a laminar flow of gas onto an uncut portion of the disc at a pressure and rate effective to lift the apparatus a predetermined distance above the disc surface so as to cause the stylus to cut the grooves to a predetermined reference depth.
Claim 5
Dependent Claim
38 words
The disc cutting apparatus as defined in claim 2 wherein the gas directing means includes a tube which is coupled to a source of gas under pressure and which has a downwardly-facing outlet port adjacent to the stylus.
Claim 6
Dependent Claim
47 words
The apparatus as defined in claim 3 wherein the gas outlet port is covered by a screen-like member having a plurality of holes which cause the gas to exit the outlet port as a plurality of laminar gas streams directed downwardly toward the surface of the disc.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |