US3711199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable focal length optical system for photocopying machine
Assignee: Ricoh Co Ltd
•
Filing: 1972-01-21
•
Granted: 1973-01-16
•
Expires: 1992-01-21
Abstract
Abstract A variable magnification optical system for a photocopying machine wherein a variable lens interposed between an original holder and a copy paper holder spaced apart from the original holder by a predetermined distance varies its focal length within its lens barrel and displaces itself along an optical path passing through a side edge of the original, whereby an image may be magnified or reduced in size with one side edge of a copy paper being a reference line for magnification or reduction.
Inventors
- 👤 Y Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/523; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
323 words
A variable magnification optical system having an optical axis for use in a photocopying machine comprising an original holder having a first reference line fixedly positioned in said machine and adapted to have an original placed thereon; a copy holder having a second reference line fixedly positioned in said machine and adapted to have a copy paper positioned thereon, said copy holder spaced a fixed distance along said optical axis from said original holder and located substantially at right angles with respect thereto; a mirror fixed in position and located between said original holder and said copy holder, said mirror mounted to be inclined with respect to said original holder and said copy holder to provide image reflection by light rays passing therebetween; a variable focus lens movably mounted between said original holder and said copy holder to focus the light rays for variable magnification; said original having an edge that is positioned and maintained on said first reference line on said original holder and providing an image that is directed along an optical path reflectable through said mirror and said variable focus lens to an edge on said copy paper that is positioned and maintained on said second reference line on said copy holder; said variable focus lens being movable to a first position on said optical axis to provide a 1:1 magnification of the image of the edge of said original directed along said optical path on said copy paper edge; and said variable focus lens being movable along a path inclined to said optical axis from said first position to a second position, said inclined path corresponding to a line passing through the first and seCond reference lines whereby the image of the edge of said original directed along said optical path is maintained on said second reference line of said copy holder and magnification of the image of the edge of said original is variable from said 1:1 magnification.
Claim 2
Dependent Claim
323 words
A variable magnification optical system having an optical axis for use in a photocopying machine comprising an original holder having a first reference line fixedly positioned in said machine and adapted to have an original placed thereon; a copy holder having a second reference line fixedly positioned in said machine and adapted to have a copy paper positioned thereon, said copy holder spaced a fixed distance along said optical axis from said original holder and located substantially at right angles with respect thereto; a mirror fixed in position and located between said original holder and said copy holder, said mirror mounted to be inclined with respect to said original holder and said copy holder to provide image reflection by light rays passing therebetween; a variable focus lens movably mounted between said original holder and said copy holder to focus the light rays for variable magnification; said original having an edge that is positioned and maintained on said first reference line on said original holder and providing an image that is directed along an optical path reflectable through said mirror and said variable focus lens to an edge on said copy paper that is positioned and maintained on said second reference line on said copy holder; said variable focus lens being movable to a first position on said optical axis to provide a 1:1 magnification of the image of the edge of said original directed along said optical path on said copy paper edge; and said variable focus lens being movable along a path inclined to said optical axis from said first position to a second position, said inclined path corresponding to a line passing through the first and seCond reference lines whereby the image of the edge of said original directed along said optical path is maintained on said second reference line of said copy holder and magnification of the image of the edge of said original is variable from said 1:1 magnification.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |