The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1987
Filed:
Dec. 30, 1986
Masahiko Kondoh, Kanagawa, JP;
Hiroshi Matsuoka, Kanagawa, JP;
Fuji Photo Film Co., Ltd., , JP;
Abstract
Improvement in the device for enlarging and projecting a microfilm image is provided. The improvement is directed to an optical system acting as a magnification varying means and image rotation means as a united system. The optical system comprises a set of reflectors including three or more odd number of reflectors, magnification varying means for changing the length of the light path through the system thereby to vary the magnification of enlargement, and an image rotation means for rotation said set of reflectors to rotate the light delivering the enlarged image, said magnification varying means and said image rotation means being co-operatively associated with each other such that the light axis of the light getting out of the optical system is aligned with the light incident to the system. In case where the number of reflectors included in the optical system is three, individual reflectors united to constitute the reflector set are moved and/or rotated to vary the magnification of enlargement while satisfying the interrelationship indicated by .alpha.-.beta.+.gamma.=.pi./2 where .alpha., .beta. and .gamma. are angles of incident lights on respective reflectors. Also provided by this invention are link assemblies for moving and/or rotating individual reflectors to ensure that they move and/or rotate while always satisfying the interrelation essential for the required performance of the optical system.