US PATENT SUBCLASS 359 / 380
.~.~.~ Variable magnification

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

362  DF  COMPOUND LENS SYSTEM {8}
368  DF  .~ Microscope {10}
379  DF  .~.~ Spacing of optical elements axially adjustable {1}
380.~.~.~ Variable magnification

DEFINITION

Classification: 359/380

Variable magnification:

(under subclass 379) Subject matter wherein varying the axial separation varies the size of an in focus terminal image while the object distance remains constant.

(1) Note. Other subclasses in this class indented under subclass 407, Binocular, and titled "Spacing of optical elements axially adjustable" may include subject matter related to variable magnification.

SEE OR SEARCH THIS CLASS, SUBCLASS:

422, for a telescope with variable magnification.

432, for variable magnification in nonmagnifying compound lens systems.

506, for adjustable extended spacing structure for optical elements.

676+, for a lens having its equivalent focal length variable continuously between limits.