DIFF Subgroup
G02B 26/02 for controlling the intensity of light
Introduced: January 1985
Full Title
Full titles differ between systems:
IPC:
Optical devices or arrangements for the control of light using movable or deformable optical elements > for controlling the intensity of light
CPC:
Optical devices or arrangements for the control of light using movable or deformable optical elements (control of light by modification of the optical properties of the media of the elements involved therein G02F1/00) > for controlling the intensity of light
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1985.
Child Classifications
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- G02B 26/04 by periodically varying the intensity of light, e.g. using choppers (shutters, diaphragms for cameras G03B9/00; devices for eliminating or reducing the effect of flicker in projection systems G03B21/40) since 1985 IPC+CPC Available in IPC and CPC