Claims
- 1. A stylus for tracking the sound groove of a stereophonic or quadraphonic record, said stylus having a longitudinal axis and having a mounting part and a taper, said taper being formed by a pair of convex curved continuous surfaces intersecting along a continuous arc disposed in both surfaces and having a substantially constant angle of intersection along said arc, said surfaces being symmetricl about a plane that includes said arc and said axis, said intersection of said surfaces being slightly rounded in the direction normal to said arc, said arc being tangent at a midpoint thereof to a plane normal to said axis.
- 2. A stylus as set fourth in claim 1 wherein said arc has a radius of curvature of about 80 to 100 microns and said rounded portion has a radius of curvature of about 4 to 10 microns.
- 3. A stylus as set forth in claim 1 wherein the radius of curvature of said rounded portion is maintained substantially constant over the region thereof contacting a record groove.
- 4. A stylus as set forth in claim 2 wherein the radius of curvature of said rounded portion is maintained substantially constant over the region thereof contacting a record groove.
- 5. A stylus as set forth in claim 1 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
- 6. A stylus as set forth in claim 2 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
- 7. A stylus as set forth in claim 3 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
- 8. A stylus as set forth in claim 4 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
- 9. A stylus for tracking the sound groove of a stereophonic or quadrophonic record, said stylus having a longitudinal axis and having a mounting part and a taper, said taper consisting essentially of a pair of convex continuous surfaces intersecting along a continuous arc having a radius of curvature of about 80 to 100 microns and disposed in both surfaces, said arc being symmetrical about a point on a plane tangent to said arc and normal to said axis, said intersection of said surfaces being rounded in a direction normal to said arc to a radius of curvature of about 4 to 10 microns.
- 10. A stylus as set forth in claim 9 wherein said surfaces are symmetrical about a plane that includes said arc.
- 11. A stylus as set forth in claim 10 wherein said plane includes said axis.
- 12. A stylus as set forth in claim 9 wherein the radius of curvature of said rounded portion is maintained substantially constant over the region thereof contacting a record groove.
- 13. A stylus as set forth in claim 10 wherein the radius of curvature of said rounded portion is maintained substantially constant over the region thereof contacting a record groove.
- 14. A stylus as set forth in claim 11 wherein the radius of curvature of said rounded portion is maintained substantially constant over the region thereof contacting a record groove.
- 15. A stylus as set forth in claim 9 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
- 16. A stylus as set forth in claim 14 wherein the plane of symmetry of said planar surfaces makes an angle of about 20.degree. with the longitudinal axis of said stylus.
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of Ser. No. 41,666 filed May 23, 1979, now abandoned, which was a continuation in part of Ser. No. 818,903 filed July 25, 1977 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2418212 |
Williamson |
Apr 1947 |
|
3848876 |
Joshko et al. |
Nov 1974 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
41666 |
May 1979 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
818903 |
Jul 1977 |
|