US5157878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing method with error correction
Assignee: Canon Inc
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Filing: 1992-02-24
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Granted: 1992-10-27
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Expires: 2012-02-24
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
2026-11-01 07:45
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/42; G05B19/4202; G05B19/4207; B; B24; B24B; B24B13/00; B24B13/06; B24B19/00; B24B19/26; B24B49/00; B24B49/02; G05B19/18; G05B19/401; 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: 2
Claim 1
Independent Claim
143 words
A method of working a surface of a workpiece with a tool, comprising the steps of: rotating the workpiece around an axis thereof and applying the tool onto the surface; pivoting the workpiece to a portion of the workpiece to be corrected; obtaining error curve data on the basis of ideal curve data of the surface and measuring data from a measurement of the surface; outputting a work amount curve data indicating an amount worked by the cutting tool at every pivoting angle of the workpiece; calculating work time at every pivoting angle from cutting tool capability data and work amount curve data; calculating a pivoting speed at every pivoting angle of the workpiece from an inverse of work time; and working the surface with the cutting tool on the basis of the calculated pivoting speed at every pivoting angle of the workpiece.
Claim 2
Independent Claim
143 words
A method of working a surface of a workpiece with a tool, comprising the steps of: rotating the workpiece around an axis thereof and applying the tool onto the surface; pivoting the workpiece to a portion of the workpiece to be corrected; obtaining error curve data on the basis of ideal curve data of the surface and measuring data from a measurement of the surface; outputting a work amount curve data indicating an amount worked by the cutting tool at every pivoting angle of the workpiece; calculating work time at every pivoting angle from cutting tool capability data and work amount curve data; calculating a pivoting speed at every pivoting angle of the workpiece from an inverse of work time; and working the surface with the cutting tool on the basis of the calculated pivoting speed at every pivoting angle of the workpiece.
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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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |