US PATENT SUBCLASS 355 / 56
.~.~ Automatic or semiautomatic focusing when varying image size

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


355 /   HD   PHOTOCOPYING

18  DF  PROJECTION PRINTING AND COPYING CAMERAS {27}
55  DF  .~ Focus or magnification control {4}
56.~.~ Automatic or semiautomatic focusing when varying image size {2}
57  DF  .~.~.~> Reflector between original and photo-sensitive paper
58  DF  .~.~.~> Including a cam or a screw with nonuniform pitch {1}

DEFINITION

Classification: 355/56

(under subclass 55) Subject matter including means to automatically move the objective lens or lens system relative to the original and photosensitive paper for proper focusing when the original and photosensitive paper are moved relative to each other to vary the size of the image projected on the photosensitive paper.

SEE OR SEARCH CLASS

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

672, and 821 for selective lenses to change the focus or magnification in optical systems and subclasses 432, 676+, and 823+ for lens systems.