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:
Jan. 19, 1982
Filed:
Feb. 28, 1979
J. H. Dallmeyer Limited, London, GB;
Abstract
The invention concerns an image focusing system for use in a reprographic camera. To improve the compactness of such a camera, it is known to provide a reflecting element to fold the optical axis extending from an object plane O to the image plane. The known disposition of the reflecting element between a focusing lens system and the image plane necessitates a very large reflecting surface area to satisfy the usual operational requirements of the aperture and field angle. This precludes the use of prisms as the reflecting element, and therefore introduces instability where image reversal is required since a roof mirror, in which the roof angle may drift, must be used. It is proposed to arrange the reflecting element within the focusing lens system, i.e. between two lens assemblies to permit smaller elements, and more particularly interchangeable plane and roof reflector prisms, to be used.