US PATENT SUBCLASS 359 / 686
.~.~.~ Four groups

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

642  DF  LENS {32}
676  DF  .~ With variable magnification (e.g., zoom type ) {6}
683  DF  .~.~ With mechanical compensation {6}
686.~.~.~ Four groups {2}
687  DF  .~.~.~.~> + - + + Arrangement
688  DF  .~.~.~.~> + - - + Arrangement

DEFINITION

Classification: 359/686

Four groups:

(under subclass 683) Subject matter wherein four groups move independently of each other and at least two at the groups function respectively as a variator, movable for varing the local length, and a compensator which moves independently of the first group for compensating for image plane deviation during focal length variation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

689+, for mechanical compensation with variable magnification having three groups.

691+, for mechanical compensation with variable magnification having two groups.