US3850436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cutting gramophone records, and articles produced thereby
Assignee: POLYBAND GES fur TONTRAEGER M
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Filing: 1971-08-10
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Granted: 1974-11-26
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Expires: 1991-08-10
Abstract
Abstract A method for cutting a modulated groove into the surface of a gramophone record disc. The groove is cut by a cutting stylus the tip of which is guided relative to a constant depth cutting plane located well below the lowest point of wobble and/or irregularity of the original disc surface. Thus, the parts of the groove crest formed when walls of adjacent grooves intersect during cutting of the disc are substantially below said lowest point of the original disc surface.
Inventors
- 👤 E Rabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:03
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/72
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A gramophone record comprising a master of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the grooves being cut into the original recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, the lowest points of said grooves being spaced from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 2
Dependent Claim
97 words
A gramophone record comprising a master of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the grooves being cut into the original recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, the lowest points of said grooves being spaced from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 3
Dependent Claim
47 words
A record according to claim 1 wherein the groove spacing and the maximum modulation amplitude are preselected so that the minimum groove crest height is a predetermined safe distance above the two pick-up points determined by the size and shape of the pick-up needle to be used.
Claim 4
Dependent Claim
48 words
A record according to claim 1 in the surface of which is cut at least one unmodulated guide groove which cooperates with a pick-up needle, wherein in the region of each said guide groove the actual surface thereof is above the entire region of the modulated groove walls.
Claim 5
Dependent Claim
97 words
A master disc comprising a disc of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the groove being cut into the original recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, the lowest points of said grooves being spaced from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 6
Dependent Claim
97 words
A master disc comprising a disc of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the groove being cut into the original recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, the lowest points of said grooves being spaced from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 7
Dependent Claim
118 words
A gramophone record comprising a disc of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the grooves being cut into the original and recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, such groove crests lying a predetermined safe distance below the lowest point of irregularity of the original surface, the crests and bottoms of Said grooves being spaced proportionately from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 8
Dependent Claim
118 words
A gramophone record comprising a disc of recording material in the surface of which are cut grooves which cooperate with a pick-up needle and which have a modulation of frequency corresponding to that of a recorded signal, the grooves being cut into the original and recording material to such a depth that a sharp groove crest is formed from the intersection of the walls of adjacent grooves regardless of the groove spacing and modulation amplitude, such groove crests lying a predetermined safe distance below the lowest point of irregularity of the original surface, the crests and bottoms of Said grooves being spaced proportionately from a constant flat cutting plane only by an amount proportional to the modulation signal.
Claim 9
Independent Claim
221 words
A method of cutting a groove into the surface of a master of recording material, the method comprising the steps of providing a supporting surface in the form of a turntable mounted for rotation so that its upper surface which supports the master is always in a constant plane, mounting a cutting stylus having a cutting tip above said turntable and said master, with the tip of said stylus being adjusted relative to the constant plane of said turntable so as to provide a flat mean cutting plane for controlling the depth of cut in the master regardless of wobble or surface irregularities in the master, cutting the master by means of said cutting tip at the desired frequency or frequency modulation frequency by positively guiding the cutting stylus with its tip at a depth relative to said mean cutting plane, with such mean cutting plane being located sufficiently below the lowest point of wobble and irregularity of the original surface so that the walls of adjacent grooves intersect and the thus formed groove crests are located substantially below said lowest point of the original surface, with modulation of said grooves varing the depth of said grooves, and thus the location of the groove bottoms and crests, from said mean cutting plane only by an amount proportional to the modulation signal.
Claim 10
Independent Claim
221 words
A method of cutting a groove into the surface of a master of recording material, the method comprising the steps of providing a supporting surface in the form of a turntable mounted for rotation so that its upper surface which supports the master is always in a constant plane, mounting a cutting stylus having a cutting tip above said turntable and said master, with the tip of said stylus being adjusted relative to the constant plane of said turntable so as to provide a flat mean cutting plane for controlling the depth of cut in the master regardless of wobble or surface irregularities in the master, cutting the master by means of said cutting tip at the desired frequency or frequency modulation frequency by positively guiding the cutting stylus with its tip at a depth relative to said mean cutting plane, with such mean cutting plane being located sufficiently below the lowest point of wobble and irregularity of the original surface so that the walls of adjacent grooves intersect and the thus formed groove crests are located substantially below said lowest point of the original surface, with modulation of said grooves varing the depth of said grooves, and thus the location of the groove bottoms and crests, from said mean cutting plane only by an amount proportional to the modulation signal.
Claim 11
Dependent Claim
58 words
A method according to claim 6 further comprising cutting a run-in groove, the bottom of the run-in groove being cut at a depth corresponding to said mean cutting plane, and both the groove walls of the run-in groove being cut in a straight line up to the original cutting surface, with a spacing between adjacent run-in groove walls.
Claim 12
Dependent Claim
58 words
A method according to claim 6 further comprising cutting a run-out groove, the bottom of the run-out groove being cut at a depth corresponding to said mean cutting plane and both the groove walls of the run-out groove being cut in a straight line up to the original cutting surface, with a spacing between adjacent run-out groove walls.
Claim 13
Dependent Claim
79 words
A method according to claim 6 further comprising the cutting of an indication groove between two modulation grooves, the cutting stylus during cutting of the indication groove continuing to cut with its tip at the depth of said mean cutting plane and being advanced with a groove spacing such that both the indication groove walls are cut to extend up to the level of the original cutting surface and with a spacing between the walls of adjacent indication grooves.
Claim 14
Dependent Claim
53 words
A method according to claim 6 for cutting records for perpendicular reproduction, wherein one groove wall is cut substantially in the direction of the modulation and the other groove wall is cut without modulation at a angle to the perpendicular to the plane of the record, said angle being between 0* and 15*.
References Cited (Backward Citations)
US2864896A
Cited
US3528665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |