US4842354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary polygonal mirror and method of making the same
Assignee: Canon Inc
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Filing: 1986-02-24
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Granted: 1989-06-27
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Expires: 2006-02-24
Abstract
Abstract A rotary polygonal mirror has a base member with a portion of a polygonal cross-section constructed of such a relatively light-weight material as can easily be formed into a relatively complicated configuration. The polygonal portion includes a reflective mirror face formed on one or more sidewalls thereof. A method of making such rotary polygonal mirror includes the step of molding the base member with or without subjecting one or more sidewalls of the polygonal portion to a precision cutting to form a reflective mirror face thereon.
Inventors
- 👤 Kimio Takahashi
- 👤 Norihisa Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:34
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A rotary polygonal mirror for use in a scanner or the like, comprising: a base member with a portion of a polygonal cross-section, said base member being wholly formed of one of a member of plastic materials and composite plastic materials whose main component consists of a plastic material, and having a bottom surface and sidewalls; a reflective mirror face formed on one or more sidewalls of said portion by means of a precision cutting operation; and a mounting reference surface for positioning the polygonal mirror within the scanner, said reference surface being formed on the bottom surface of said portion by means of a precision cutting operation.
Claim 2
Dependent Claim
108 words
A rotary polygonal mirror for use in a scanner or the like, comprising: a base member with a portion of a polygonal cross-section, said base member being wholly formed of one of a member of plastic materials and composite plastic materials whose main component consists of a plastic material, and having a bottom surface and sidewalls; a reflective mirror face formed on one or more sidewalls of said portion by means of a precision cutting operation; and a mounting reference surface for positioning the polygonal mirror within the scanner, said reference surface being formed on the bottom surface of said portion by means of a precision cutting operation.
Claim 3
Dependent Claim
21 words
A rotary polygonal mirror as defined in claim 1, further comprising a reflection intensifying film formed on said reflective mirror face.
Claim 4
Dependent Claim
20 words
A rotary polygonal mirror as defined in claim 2, further comprising a protective film formed on said reflection intensifying film.
Claim 5
Independent Claim
92 words
A method of making a rotary polygonal mirror for use in a scanner or the like, said method comprising the steps of: molding a base member with a portion of a polygonal cross-section from one of a number of plastic materials and composite plastic materials whose main component consists of a plastic material; precision cutting one or more sidewalls of said portion to form a reflective mirror face thereon; and precision cutting a bottom surface of said portion to form a mounting reference surface for positioning the polygonal mirror within the scanner.
Claim 6
Independent Claim
92 words
A method of making a rotary polygonal mirror for use in a scanner or the like, said method comprising the steps of: molding a base member with a portion of a polygonal cross-section from one of a number of plastic materials and composite plastic materials whose main component consists of a plastic material; precision cutting one or more sidewalls of said portion to form a reflective mirror face thereon; and precision cutting a bottom surface of said portion to form a mounting reference surface for positioning the polygonal mirror within the scanner.
Claim 7
Dependent Claim
22 words
A method as defined in claim 4, further comprising the step of forming a reflection intensifying film on said reflective mirror face.
Claim 8
Dependent Claim
21 words
A method as defined in claim 5, further comprising the step of forming a protective film on said reflection intensifying film.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |