US4228940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape guide means for recording and/or reproducing apparatus and method of manufacturing the same
Assignee: Individual
•
Filing: 1978-09-07
•
Granted: 1980-10-21
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Expires: 1998-09-07
Abstract
Abstract A tape guide pin for recording and/or reproducing apparatus includes a base body made of non-magnetic material; and a surface layer formed on the base body, made of non-magnetic hard material, the surface layer having the surface roughness whose microscopic tips are rounded. A method of manufacturing the tape guide pin for recording and/or reproducing apparatus includes the steps of: forming a base body of non-magnetic material; forming a surface layer of non-magnetic hard material on the base body; subjecting the base body and/or the surface layer to surface treatment for dimensional accuracy of circumferential surface; and fine-finishing for rounding the microscopic tips of the surface roughness formed by the surface treatment for dimensional accuracy.
Inventors
- 👤 Yozaburu Umehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:59
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/605; G11B15/61
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
Tape guide means for recording and/or reproducing apparatus, comprising a non-magnetic base body and a non-magnetic hard surface layer formed on said base body, said surface layer having rounded microscopic tips whose surface roughness is obtained by surface grinding of the circumferential surface of said surface layer after said surface layer is formed on said base body, thereby the pattern of said microscopic tips extends substantially linearly in the traverse direction to the axial direction of the tape guide means.
Claim 2
Dependent Claim
80 words
Tape guide means for recording and/or reproducing apparatus, comprising a non-magnetic base body and a non-magnetic hard surface layer formed on said base body, said surface layer having rounded microscopic tips whose surface roughness is obtained by surface grinding of the circumferential surface of said surface layer after said surface layer is formed on said base body, thereby the pattern of said microscopic tips extends substantially linearly in the traverse direction to the axial direction of the tape guide means.
Claim 3
Dependent Claim
22 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said base body is made of stainless steel.
Claim 4
Dependent Claim
23 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said surface layer is made of hard chromium material.
Claim 5
Dependent Claim
22 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said base body is made of aluminium alloy.
Claim 6
Dependent Claim
22 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said base body is made of copper alloy.
Claim 7
Dependent Claim
30 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which the Vickers hardness of said surface layer is within the range of 400 to 1000 Hv.
Claim 8
Dependent Claim
33 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which the surface roughness of said surface layer is within the range of 0.2 to 0.6μ Rmax in metric system.
Claim 9
Dependent Claim
22 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, which is in the form of a solid round rod.
Claim 10
Dependent Claim
20 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, which is in the form of a pipe.
Claim 11
Dependent Claim
21 words
Tape guide means for recording and/or reproducing apparatus according to claim 1 which is in the form of a rolled piece.
Claim 12
Dependent Claim
35 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which a cutout portion is formed at one end of the rolled piece, aligned with the abutment surface of the rolled piece.
Claim 13
Dependent Claim
52 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which cutout portions equal to each other are formed at both ends of the rolled piece, aligned with the abutment surface of the rolled piece, said cutout portions being symmetrical to each other with respect to said abutment surface.
Claim 14
Dependent Claim
19 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said cutout portion is V-shaped.
Claim 15
Dependent Claim
19 words
Tape guide means for recording and/or reproducing apparatus according to claim 1, in which said cutout portions are V-shaped.
Claim 16
Dependent Claim
50 words
A tape-guide pin for a video tape recorder comprising a non-magnetic austenitic base body and a surface layer of chromium coated onto said body and having a Vickers hardness of 400 to 1000 Hv and a surface roughness of 0.2 to 0.6 microns R max with all surface-roughness peaks rounded.
Claim 17
Dependent Claim
50 words
A tape-guide pin for a video tape recorder comprising a non-magnetic austenitic base body and a surface layer of chromium coated onto said body and having a Vickers hardness of 400 to 1000 Hv and a surface roughness of 0.2 to 0.6 microns R max with all surface-roughness peaks rounded.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |