Image focusing system

Details Image focusing system Image focusing system

1979-02-28

1982-01-19

Corbin, John K.

G02B 962, G02B 1704

Patent

active

043113664

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.

REFERENCES:
patent: 2860543 (1958-11-01), Miles
patent: 3357775 (1967-12-01), Appeldorn et al.
patent: 3498713 (1970-03-01), Schlegel et al.
patent: 3701587 (1972-10-01), Kojima
patent: 3709582 (1973-01-01), Walker
patent: 3716291 (1973-02-01), Giesecke
patent: 3731990 (1973-05-08), Van Orden

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