US PATENT SUBCLASS 359 / 690
.~.~.~.~ + - + Arrangement

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}
689  DF  .~.~.~ Three groups {1}
690.~.~.~.~ + - + Arrangement

DEFINITION

Classification: 359/690

+-+ Arrangement:

(under subclass 689) Subject matter wherein the plus and minus signs indicate convergent and divergent groups, respectively.

(1) Note. The arrangement along the optical axis of the lens is identified by the left most sign representing the group at the entrant face of the lens, i.e., the direction of light travelling through the lens is the same as the reading arrangement of the subclass title.