US4719488A
Expired / Lapsed
US
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Imaging optical system using distributed index optical elements
Assignee: Canon Inc
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Filing: 1985-06-11
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Granted: 1988-01-12
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Expires: 2005-06-11
Abstract
Abstract In an imaging optical system, the angular aperture of distributed index optical elements which are optical elements forming the imaging optical system is 9° or greater and the degree of superposition M of images on a light-receiving surface is M=2.75+0.5x. The degree of superposition M of images is represented by M=X 0 /D, where D is the effective diameter of the optical elements and X 0 is the field radius thereof. Also, x is 0 or a greater integer.
Inventors
- 👤 Michitaka Setani
- 👤 Mitsuhiro Tokuhara
- 👤 Hiroaki Tsuchiya
- 👤 Haruhisa Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:06
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24; G02B3/00; G02B3/0087; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/523
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
129 words
A copying apparatus comprising: a carriage for supporting an original thereon; illuminating means for illuminating the original; and an imaging optical system for forming the image of the original on a photosensitive drum, said optical system being formed by a plurality of distributed index optical elements of erect one-to-one magnification arranged in a row, the angular aperture θ of said optical elements being 9°≦θ≦13°, and wherein when the effective diameter of each of said optical elements is D and the field radius thereof is X 0 and the degree of superposition M of the images of the original formed on a light-receiving surface by said optical elements is defined as X 0 /D, said M has a value of approximately M=2.75+0.5x, where x is 0 or a greater integer.
Claim 2
Dependent Claim
129 words
A copying apparatus comprising: a carriage for supporting an original thereon; illuminating means for illuminating the original; and an imaging optical system for forming the image of the original on a photosensitive drum, said optical system being formed by a plurality of distributed index optical elements of erect one-to-one magnification arranged in a row, the angular aperture θ of said optical elements being 9°≦θ≦13°, and wherein when the effective diameter of each of said optical elements is D and the field radius thereof is X 0 and the degree of superposition M of the images of the original formed on a light-receiving surface by said optical elements is defined as X 0 /D, said M has a value of approximately M=2.75+0.5x, where x is 0 or a greater integer.
Claim 3
Dependent Claim
22 words
An imaging optical system according to claim 1, wherein the value of said M is in the vicinity of 2.75 or 3.25.
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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |