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US 4,901,113 AGranted
Image-forming device
AssigneeRicoh Company, Ltd.
InventorsNoboru Sawayama, Shinichi Kamiyama, Hideo Yuh, Masayuki Takashima, Tadayuki Sekiya
Life of this patent
Estimating the term…
Abstract
An image forming device having a mechanism for conducting variable magnification by moving a mirror, and lenses, which includes an optical system having six mirrors and a mechanism for moving the fourth mirror and the fifth mirror which are disposed behind the lenses.
Claims3
An image forming device having a mechanism for conducting variable magnification by moving mirrors and lenses, which comprises:
- an optical system including at least six mirrors and a lens wherein said lens is disposed downstream of a fourth and fifth mirror of said at least six mirrors;
- a mechanism for moving said fourth and fifth mirror;
- and
- means for shifting said lens towards said fourth and fifth mirrors so as to change the magnification thereof between x2.0 and x0.5
1 more element
Dependencies are inferred from the claim text.