Patent US4993190A successfully refreshed from Google Patents.
US4993190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing apparatus
Assignee: Canon Inc
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Filing: 1990-06-08
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Granted: 1991-02-19
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Expires: 2010-06-08
Abstract
Abstract A polishing apparatus for polishing optical components and mechanical parts requiring a high surface precision, such as lenses and mirrors, by pressing a running tape to such component.
Inventors
- 👤 Toyohiko Hiyoshi
- 👤 Mikio Iwata
- 👤 Kazuo Watanabe
- 👤 Shinkichi Ohkawa
- 👤 Masanori Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:20
CPC Classifications
B; B24; B24B; B24B21/00; B24B21/004; B24B13/00; B24B21/02; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/31; G05B2219/31407; G05B2219/43; G05B2219/43126; G05B2219/45; G05B2219/45199; G05B2219/49; G05B2219/49311; G05B2219/50; G05B2219/50353
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
325 words
A polishing apparatus for polishing a work piece having a curved surface to be polished comprising: rotating means for holding the work piece and rotating the work piece around a rotational axis which is coincident with a center line of the curved surface; pivoting means for pivoting the curved surface of the work piece around a pivot axis which is perpendicular to the center line of the curved surface; supply means for supplying a polishing tape, said supply means comprising a polishing tape supply portion, a polishing tape winding portion, a pressing member for pressing the polishing tape onto the curved surface of the work piece, and applying means for applying a pressing force to said pressing member, wherein said pressing member presses the polishing tape onto the curved surface of the work piece, which rotates around the center line of the curved surface and pivots around the pivot axis, and said pressing member has a rounded portion of a predetermined curvature at one end thereof, and is adapted to feed, over said end, the tape running between said tape supply portion and said tape winding portion; measuring means for measuring a displacement of said pressing member; a detecting means for detecting the pivot angle of said pivot means; memory means for memorizing design data of the work piece; and a computer for controlling each said means, said computer determining the amount of work to be done on the work piece by a process wherein the polishing tape is detached from said pressing member of said polishing tape supply means and directly abuts said pressing member against the work piece, the pivot angle of said pivoting means is reset to an origin point, the work piece is pivoted by said pivoting means and displacement is measured by said measuring means, and an amount of correction work and a correction work position is determined by the measured data and the design data in said memory means.
Claim 2
Dependent Claim
325 words
A polishing apparatus for polishing a work piece having a curved surface to be polished comprising: rotating means for holding the work piece and rotating the work piece around a rotational axis which is coincident with a center line of the curved surface; pivoting means for pivoting the curved surface of the work piece around a pivot axis which is perpendicular to the center line of the curved surface; supply means for supplying a polishing tape, said supply means comprising a polishing tape supply portion, a polishing tape winding portion, a pressing member for pressing the polishing tape onto the curved surface of the work piece, and applying means for applying a pressing force to said pressing member, wherein said pressing member presses the polishing tape onto the curved surface of the work piece, which rotates around the center line of the curved surface and pivots around the pivot axis, and said pressing member has a rounded portion of a predetermined curvature at one end thereof, and is adapted to feed, over said end, the tape running between said tape supply portion and said tape winding portion; measuring means for measuring a displacement of said pressing member; a detecting means for detecting the pivot angle of said pivot means; memory means for memorizing design data of the work piece; and a computer for controlling each said means, said computer determining the amount of work to be done on the work piece by a process wherein the polishing tape is detached from said pressing member of said polishing tape supply means and directly abuts said pressing member against the work piece, the pivot angle of said pivoting means is reset to an origin point, the work piece is pivoted by said pivoting means and displacement is measured by said measuring means, and an amount of correction work and a correction work position is determined by the measured data and the design data in said memory means.
Claim 3
Dependent Claim
26 words
A polishing apparatus according to claim 1, wherein said tape supply portion comprises a groove for guiding the tape on said end of said rod member.
Claim 4
Dependent Claim
23 words
A polishing apparatus according to claim 2, wherein said tape supply portion comprises a sleeve for guiding the tape on said rod member.
Claim 5
Dependent Claim
29 words
The polishing apparatus according to the claim 1, further comprising: reciprocating means for reciprocating said polishing tape in relation to the surface of the work piece to be polished.
Claim 6
Dependent Claim
202 words
A process of working a work piece by using a computer for controlling rotating means for rotating the work piece having a curved surface, pivoting means for pivoting the work piece, detecting means for detecting a pivot angle of the work piece, supply means supplying a polishing tape for polishing the curved surface of the work piece, and a memory for storing a correction program including pivot angle and pivoting means speed data, comprising: aligning a center of a radius of curvature of the curved surface of the work piece so as to be coincident with a pivot point of the pivoting means; pivoting the work piece by the pivoting means to a portion of the work piece to be corrected; actuating the rotating means and the polishing tape supply means; detecting data on the pivot angle by the detecting means; controlling the pivoting means to pivot the work piece by a pivot angle corresponding to the detected data; repeating the pivot angle detection until the pivot angle data read by the detecting means becomes a predetermined angle stored in the correction program; and terminating an operation of each means in response to detecting the pivot angle which is the predetermined angle.
Claim 7
Dependent Claim
202 words
A process of working a work piece by using a computer for controlling rotating means for rotating the work piece having a curved surface, pivoting means for pivoting the work piece, detecting means for detecting a pivot angle of the work piece, supply means supplying a polishing tape for polishing the curved surface of the work piece, and a memory for storing a correction program including pivot angle and pivoting means speed data, comprising: aligning a center of a radius of curvature of the curved surface of the work piece so as to be coincident with a pivot point of the pivoting means; pivoting the work piece by the pivoting means to a portion of the work piece to be corrected; actuating the rotating means and the polishing tape supply means; detecting data on the pivot angle by the detecting means; controlling the pivoting means to pivot the work piece by a pivot angle corresponding to the detected data; repeating the pivot angle detection until the pivot angle data read by the detecting means becomes a predetermined angle stored in the correction program; and terminating an operation of each means in response to detecting the pivot angle which is the predetermined angle.
Claim 8
Dependent Claim
226 words
A polishing apparatus for polishing a work piece having a curved surface to be polished comprising: rotating means for holding the work piece and rotating the work piece around a rotational axis which is coincident with a center line of the curved surface; pivoting means for pivoting the curved surface of the work piece around a pivot axis which is perpendicular to the center line of the curved surface; supply means for supplying a polishing tape, said supply means comprising a polishing tape supply portion, a polishing tape winding portion, and a pressing member for pressing the polishing tape onto the curved surface of the work piece; measuring means for measuring an amount of the work piece polished, said measuring means utilizing said pressing member as a probe and contacting the polished surface of the rotating work piece to detect an amount of displacement of the probe and a rotational angle; ideal curve data outputting means for outputting design data of the curved surface of the work piece; calculation control means for calculating speed data in which each of the rotational speeds correspond to each of the rotational angles, on the basis of data from the measuring means and the ideal curve data outputting means; and a control computer for controlling the pivoting means on the basis of the data calculated by the calculation control means.
Claim 9
Dependent Claim
226 words
A polishing apparatus for polishing a work piece having a curved surface to be polished comprising: rotating means for holding the work piece and rotating the work piece around a rotational axis which is coincident with a center line of the curved surface; pivoting means for pivoting the curved surface of the work piece around a pivot axis which is perpendicular to the center line of the curved surface; supply means for supplying a polishing tape, said supply means comprising a polishing tape supply portion, a polishing tape winding portion, and a pressing member for pressing the polishing tape onto the curved surface of the work piece; measuring means for measuring an amount of the work piece polished, said measuring means utilizing said pressing member as a probe and contacting the polished surface of the rotating work piece to detect an amount of displacement of the probe and a rotational angle; ideal curve data outputting means for outputting design data of the curved surface of the work piece; calculation control means for calculating speed data in which each of the rotational speeds correspond to each of the rotational angles, on the basis of data from the measuring means and the ideal curve data outputting means; and a control computer for controlling the pivoting means on the basis of the data calculated by the calculation control means.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |