Patent US3897132A successfully refreshed from Google Patents.
US3897132A
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Method and apparatus for correcting pyramidal error in an optical system with a mirror wheel
Assignee: Agfa Gevaert AG
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Filing: 1974-02-05
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Granted: 1975-07-29
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Expires: 1994-02-05
Abstract
Abstract A method and apparatus for correcting pyramidal errors in light reflected from a mirror wheel, in which a light beam reflected by the mirror wheel is directed onto a first plane mirror which reflects the light beam onto a second plane mirror including an angle with the first and the thus twice reflected light beam passes from the second mirror back onto the mirror wheel and is finally reflected from the latter to a focussing lens.
Inventors
- 👤 Louis Achilles Meeussen
- 👤 Josef Helmberger
- 👤 Klaus Staddler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:46
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/129; G02B27/00; G02B27/0025; G02B27/0031
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A method for correcting pyramidal errors in an optical system including a mirror wheel having an axis and a plurality of lightreflective planar surfaces disposed about the circumference of said wheel, each of said planar surfaces being only substantially parallel to said axis and thereby producing respective pyramidal errors, comprising the steps of directing a primary beam of light from a light source onto one of said planar surfaces requiring correction of its pyramidal error so as to produce a first reflected beam; receiving said first reflected beam and at least twice reflecting the latter to direct a second reflected light beam back towards said same one planar surface so as to produce a final reflected beam; and focussing respective ones of said final reflected beams from said planar surfaces at a focal point.
Claim 2
Independent Claim
134 words
A method for correcting pyramidal errors in an optical system including a mirror wheel having an axis and a plurality of lightreflective planar surfaces disposed about the circumference of said wheel, each of said planar surfaces being only substantially parallel to said axis and thereby producing respective pyramidal errors, comprising the steps of directing a primary beam of light from a light source onto one of said planar surfaces requiring correction of its pyramidal error so as to produce a first reflected beam; receiving said first reflected beam and at least twice reflecting the latter to direct a second reflected light beam back towards said same one planar surface so as to produce a final reflected beam; and focussing respective ones of said final reflected beams from said planar surfaces at a focal point.
Claim 3
Dependent Claim
138 words
A compensation device for correcting pyramidal errors in an optical system, comprising a mirror wheel having an axis and a plurality of light reflective planar surfaces disposed about the circumference of said wheel, each of said planar surfaces being only substantially parallel to said axis and thereby producing respective pyramidal errors; a light source directing a primary beam of light onto one of said planar surfaces requiring correction of its pyramidal error as as to produce a first reflected beam; reflecting means for receiving said first reflected beam and for at least twice reflecting the latter to direct a second reflected light beam back towards said same one planar surface so as to produce a final reflected beam; and focussing means for focussing respective ones of said final reflected beams from said planar surfaces at a focal point.
Claim 4
Dependent Claim
138 words
A compensation device for correcting pyramidal errors in an optical system, comprising a mirror wheel having an axis and a plurality of light reflective planar surfaces disposed about the circumference of said wheel, each of said planar surfaces being only substantially parallel to said axis and thereby producing respective pyramidal errors; a light source directing a primary beam of light onto one of said planar surfaces requiring correction of its pyramidal error as as to produce a first reflected beam; reflecting means for receiving said first reflected beam and for at least twice reflecting the latter to direct a second reflected light beam back towards said same one planar surface so as to produce a final reflected beam; and focussing means for focussing respective ones of said final reflected beams from said planar surfaces at a focal point.
Claim 5
Dependent Claim
32 words
A device as defined in claim 2, wherein said first and second reflected light beams form a first angle equal to a second angle formed by said primary and final reflected beams.
Claim 6
Dependent Claim
16 words
A device as defined in claim 2, wherein said means for focussing is a converging lens.
Claim 7
Dependent Claim
19 words
A device as defined in claim 2, wherein said reflecting means comprises two plane mirrors meeting at an angle.
Claim 8
Dependent Claim
12 words
A device as defined in claim 5, wherein said angle is 90*.
Claim 9
Dependent Claim
15 words
A device as defined in claim 5, wherein said angle differs from a 90* angle.
Claim 10
Dependent Claim
33 words
A device as defined in claim 5, wherein the line formed by the intersection of said two plane mirrors lies in a plane which is perpendicular to said axis of the mirror wheel.
Claim 11
Dependent Claim
17 words
A device as defined in claim 2, wherein said means for focussing is a telecentric optical system.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |