Systems for automatic generation of focusing signals

Introduced: January 1990

Last revised: January 2021

Full Title

Mountings, adjusting means, or light-tight connections, for optical elements > Systems for automatic generation of focusing signals

Classification Context

Section:: PHYSICS
Class:: OPTICS
Subclass:: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

Filing statistics

IPC G02B 7/28 belongs to the parent subclass G02B, which recorded 685,920 patent applications worldwide between 2013 and 2023. Annual filings grew from 48,241 in 2013 to 61,226 in 2023 (+27%), peaking at 73,100 applications in 2020. The most active applicants in class G02 are BOE TECHNOLOGY GROUP COMPANY (13,460 applications), BOE TECHNOLOGY GROUP COMPANY (11,745 applications) and SAMSUNG DISPLAY (10,908 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

using such signals to control focus of particular apparatus, see the subclasses for the apparatus, e.g.

4 direct subcodes

Child Classifications

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G02B 7/3 using parallactic triangle with a base line
G02B 7/34 using different areas in a pupil plane
G02B 7/36 using image sharpness techniques
G02B 7/4 using time delay of the reflected waves, e.g. of ultrasonic waves

Top Applicants

Top 10 applicants by patent filingsfor class G02, 2013–2023, worldwide · Source: EPO PATSTAT

BOE TECHNOLOGY GROUP COMPANY 13,460
BOE TECHNOLOGY GROUP COMPANY CN 11,745
SAMSUNG DISPLAY KR 10,908
CANON 9,072
FUJIFILM JP 7,957
SAMSUNG ELECTRONICS COMPANY KR 7,805
LG DISPLAY COMPANY KR 6,558
CHINESE ACADEMY OF SCIENCES 5,855
NITTO DENKO CORPORATION JP 5,817
OLYMPUS CORPORATION JP 4,579