US PATENT SUBCLASS 359 / 683
.~.~ With mechanical compensation

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.~.~ With mechanical compensation {6}
684  DF  .~.~.~> Other than first group moves for focusing (internal focus type)
685  DF  .~.~.~> Nonlinear variator/compensator movements
686  DF  .~.~.~> Four groups {2}
689  DF  .~.~.~> Three groups {1}
691  DF  .~.~.~> Two groups {1}
693  DF  .~.~.~> With macro-type focusing

DEFINITION

Classification: 359/683

With mechanical compensation:

(under subclass 676) Subject matter wherein the lens includes at least a first lens group including a variator movable for varying the focal length and at least a second lens group including a compensator which moves independently of the first group for compensating for image plane deviation during focal length variation.

(1) Note. A group is an assembly of one or more components used as a single unit to achieve a particular function such as focussing, variating, compensating, or relaying.

(2) Note. Focusing is the action of converging light beams to a minimum size spot of light.

(3) Note. Relaying is the action of transferring an input light beam from a relay to another device without effecting any change between the relay input and output light beam.

(4) Note. A component consists of either (1) a single optical piece (i.e., element) comprising a single transparent mass of refractive material having two opposed refracting surfaces, which surfaces are disposed transversely of the

optical axis of the lens and spaced therealong or (2) a plurality of such masses arranged in series along the optical axis of the lens with their adjacent refracting surfaces either in full overall contact, or in spaced parallel relation with the spacing being of such small magnitude that it does not enter into the lens computations.