IPC Subgroup
G03B 13/18 Focusing aids
Introduced: September 1968
Last revised: January 2021
Full Title
Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras > Focusing aids
Classification Context
- Section:
- PHYSICS
- Class:
- PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- Subclass:
- APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
3 direct subcodes
Child Classifications
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- G03B 13/2 Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
- G03B 13/24 Focusing screens
- G03B 13/3 indicating depth of field