Photocopying – Contact printing – Light boxes
Patent
1994-06-17
1995-09-12
Smith, Matthew S.
Photocopying
Contact printing
Light boxes
355232, 355235, 355 55, 355 58, 359819, 359822, 359824, G03G 1504
Patent
active
054501750
ABSTRACT:
An image forming apparatus has an optical device for image magnification change. The apparatus is provided with a fixed platen on which a document is placed, four reflecting mirrors and an exposure lamp by which the document is exposed and scanned, and a lens unit including a fixed-focus lens by which an image of the document is formed on an image carrier. An imagewise light emitted from a document is reflected by the first, second and third reflecting mirrors and is transmitted through the fixed-focus lens. The reflected light is projected into the image carrier by way of the fourth reflecting mirror at which the light transmitted by the fixed-focus lens is reflected. The lens unit accommodates the fixed-focus lens and is movable in the same moving direction as the first, second and third reflecting mirrors at the time of an image magnification change operation. A lens cam member is mounted on the lens unit. The lens cam member has a first cam surface for enlargement and a second cam surface for reduction on at least one side thereof. An operation member has a first operation member which carries the cam surface for enlargement operations, and a second operation member which carries the cam surface for reduction operations. An interlock member interlocks with the fourth reflecting mirror so that a moving amount of the first operation member when engaged with the first and second cam surfaces, causes a movement of the fourth reflecting mirror based on the movement amount of said operation member.
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Otomo Naoki
Sato Toshiya
Konica Corporation
Smith Matthew S.
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