Title: Record disc cutting stylus

Abstract: A record disc cutting stylus comprises a cutting stylus body which is held at its upper end by a shank. At its lower end, there is a stylus tip portion which has a mirror surface, a relief surface with a relief angle .gamma., and a burnishing facet with a burnishing angle .beta. and a burnishing facet width d. The burnishing angle .beta. is as large as possible, and the width d and the relief angle .gamma. are as small as possible. The stylus projects distance l between the lower end face of the shank and the extreme tip of the stylus tip portion, which projection is as small as possible. The burnishing angle .beta. has a value substantially within a range of 25.degree. to 40.degree.; the burnishing facet width d is substantially within a range of 0.5 .mu.m to 3.0 .mu.m; the relief angle .gamma. is substantially within a range of 30.degree. to 40.degree.; and the stylus projecting distance l is substantially less than 2.0 .mu.m.

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Inventors: Totuka, Kaoru (Tokyo, JA)
Ohwaki, Isao (Tokyo, JA)
Ohba, Masahiro (Yokohama, JA)
Nakamura, Shinji (Tokyo, JA)

Application Number: 627195
Filing Date: 1975-10-30
Publication_date: 1977-07-05
Assignee: Victor Company of Japan, Limited (Yokohama, JA)
Primary Class(es): 369/173 369/154
Other Classes:
US Patent Ref:

2018496	Oct, 1935	Keller	274/38.
2530284	Nov, 1950	Capps et al.	274/38.
2627416	Feb, 1953	Schoemehl et al.	274/38.

Other Refs:
Primary Examiner: Stephan, Steven L.
Assistant Examiner:
Attorney: