US4340954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stylus tip fabrication from a synthetic diamond stone
Assignee: RCA Corp
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Filing: 1980-08-04
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Granted: 1982-07-20
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Expires: 2000-08-04
Abstract
Abstract A stylus tip is fabricated from a portion of a synthetic diamond stone having a plurality of facets oriented along the {100} family of planes. The portion is bounded by a right circular cylinder having a base thereof centered along one of the {100} facets having a surface area larger than the average surface area of the {100} facets, and having a base diameter and height equal to about half the width of the one facet.
Inventors
- 👤 Shiu-Shin Chio
- 👤 George A. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/16; B24B19/165; G; G11; G11B; G11B3/00; G11B3/44; G11B3/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A method of fabricating a stylus tip, adapted to track a path along the surface of an information record, from a synthetic diamond stone having a plurality of facets oriented along the {100} family of planes, said facets having an average surface area, comprising the steps of: selecting from said plurality of facets one facet having a surface area larger than said average surface area, and fabricating said entire tip from a portion of said stone bounded by a right circular cylinder having a base thereof centered along said one facet, said cylinder having a base diameter and height equal to about half the width of said one facet.
Claim 2
Independent Claim
109 words
A method of fabricating a stylus tip, adapted to track a path along the surface of an information record, from a synthetic diamond stone having a plurality of facets oriented along the {100} family of planes, said facets having an average surface area, comprising the steps of: selecting from said plurality of facets one facet having a surface area larger than said average surface area, and fabricating said entire tip from a portion of said stone bounded by a right circular cylinder having a base thereof centered along said one facet, said cylinder having a base diameter and height equal to about half the width of said one facet.
Claim 3
Dependent Claim
42 words
A method as recited in claim 1 further comprising the step of mounting said stone on a shank in a manner wherein said one facet is positioned away from said shank along a plane substantially orthogonal to the axis of said shank.
Claim 4
Dependent Claim
34 words
A method as recited in claim 1 wherein said synthetic diamond stone comprises a cubo-octahedron stone having a 50/60 mesh size, and wherein the width of said one facet is greater than 100 μm.
Claim 5
Dependent Claim
26 words
A method as recited in claim 3 wherein the base diameter of said cylinder is about 70 μm and the height thereof is about 60 μm.
Claim 6
Dependent Claim
85 words
In a stylus tip fabricated from a synthetic diamond stone having a plurality of facets oriented along the {100} family of planes, said facets having an average surface area, the improvement comprising said entire tip being a portion of said stone bounded by a right circular cylinder having a base thereof centered along one of said facets having a surface area larger than said average surface area, said cylinder having a base diameter and height equal to about half the width of said one facet.
Claim 7
Dependent Claim
85 words
In a stylus tip fabricated from a synthetic diamond stone having a plurality of facets oriented along the {100} family of planes, said facets having an average surface area, the improvement comprising said entire tip being a portion of said stone bounded by a right circular cylinder having a base thereof centered along one of said facets having a surface area larger than said average surface area, said cylinder having a base diameter and height equal to about half the width of said one facet.
Claim 8
Dependent Claim
40 words
A stylus tip as defined in claim 5 in combination with a shank having said stone mounted thereon such that said one facet is positioned away from said shank along a plane substantially orthogonal to the axis of said shank.
Claim 9
Dependent Claim
39 words
A stylus tip as defined in claim 5 wherein said synthetic diamond stone comprises a cubo-octahedron stone having a size equated with a 50/60 mesh sieve, and wherein the width of said one facet is greater than 100 μm.
Claim 10
Dependent Claim
27 words
A stylus tip as defined in claim 7 wherein the base diameter of said cylinder is about 70 μm and the height thereof is about 60 μm.
References Cited (Backward Citations)
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Cited
US1914658A
Cited
US2173763A
Cited
US3383752A
Cited
US3848876A
Cited
US3877705A
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |