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

Introduced: September 1968

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

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

CPC subdivides this area 3x more granularly than IPC with 5 additional codes.

5 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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G02B 15/142 +2 CPC CPC only CPC only
G02B 15/143 +2 CPC CPC only CPC only
G02B 15/144 +2 CPC CPC only CPC only
G02B 15/145 +2 CPC CPC only CPC only
G02B 15/146 +2 CPC CPC only CPC only
G02B 15/15 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation since 1985 IPC+CPC Available in IPC and CPC
G02B 15/16 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group (G02B15/22 takes precedence) IPC+CPC Available in IPC and CPC
G02B 15/22 with movable lens means specially adapted for focusing at close distances since 1985 IPC+CPC Available in IPC and CPC