US PATENT SUBCLASS 359 / 648
.~ With field curvature shaping

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

642  DF  LENS {32}
648.~ With field curvature shaping {1}
649  DF  .~.~> Projection type {2}

DEFINITION

Classification: 359/648

With field curvature shaping:

(under subclass 642) Subject matter wherein the curvature of the refractive surface controls the altering of the curvature of the image or the production of an image of a curved object field.