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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G02B 15/20

having an additional movable lens or lens group for varying the objective focal length

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Optical objectives with means for varying the magnification > by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective > with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group > having an additional movable lens or lens group for varying the objective focal length

CPC:

Optical objectives with means for varying the magnification (anamorphotic objectives G02B13/08) > by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective > with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group (G02B15/22 takes precedence) > having an additional movable lens or lens group for varying the objective focal length

No child classifications to compare. This is a leaf node in both IPC and CPC.