US PATENT SUBCLASS 359 / 672
.~ Selective magnification by exchanging or adding a lens component

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

642  DF  LENS {32}
672.~ Selective magnification by exchanging or adding a lens component {3}
673  DF  .~.~> To the front of a basic lens
674  DF  .~.~> To the middle of a basic lens
675  DF  .~.~> To the rear of a basic lens

DEFINITION

Classification: 359/672

Selective magnification by exchanging or adding a lens component:

(under subclass 642) Subject matter wherein one or more components of a basic lens are replaceable by one or more other components to produce in combination with any remaining components of the basic lens having substantially the same image plane as that of the basic lens but having a different equivalent focal length from that of the original basic lens.

(1) Note. The number of original components removed from the basic lens may not always be the same as the number of components which replace such original components, in which case the exchange of components may result in the addition of components to the original lens. This subclass includes adding or subtracting lens components, while subclass 819 relates to the changing of the entire lens.

(2) Note. The prisms may be moved to vary the length in one plane only, while in subclass 678 the prisms are moved to vary the focal length in all planes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

676+, for variable magnification lenses generally.

678, for lenses wherein at least one component is formed of symmetrically refracting prisms which are rotatable about

axes parallel to their refracting edges. See (2) Note above.

737, for lenses combined with a nonlens refracting element which is usually a wedge-shaped prism. 744, for a focal lens attachments to be used with lenses to change the equivalent focal lengths of the lenses

754+, for multiple component lenses.

821+, for plural lenses in a common carrier selectively operable. See (1) Note above.