US PATENT SUBCLASS 355 / 55
.~ Focus or magnification control

Current as of: June, 1999
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355 /   HD   PHOTOCOPYING

18  DF  PROJECTION PRINTING AND COPYING CAMERAS {27}
55.~ Focus or magnification control {4}
56  DF  .~.~> Automatic or semiautomatic focusing when varying image size {2}
60  DF  .~.~> Reflector between original and photo-sensitive paper
61  DF  .~.~> Including indicator or scale {1}
63  DF  .~.~> Vertical optical path

DEFINITION

Classification: 355/55

(under subclass 18) Subject matter including means to move the holder for the original, the objective lens, and the photosensitive paper holder relative to each other for focusing or changing and degree of magnification or reduction; or including structure adapted to allow interchanging of objective lenses of different focal lengths.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44+, for a copier including a focusing screen.

75+, for means to tilt the original relative to the optical axis.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

432, and 821 for selective lenses to change the focus or magnification in optical systems.