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IPC Main Group
G05D 25/00

Control of light, e.g. intensity, colour or phase

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:
PHYSICS
Class:
CONTROLLING; REGULATING
Subclass:
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

Additional Content

Limiting references

Optical devices or arrangements using movable or deformable elements for controlling light independent of the light source Devices or arrangements, the optical operation of which is modified by changing the optical properties of the medium of the devices or arrangements for the control of light, circuit arrangements specially adapted therefor, control of light by electro-magnetic waves, electrons, or other elementary particles

Application references

Control devices associated with light sources in photographic composing machines Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation of lasers Circuit arrangements for operating electroluminescent light sources, incandescent light sources, discharge lamps, light emitting diodes, light sources using a charge of combustible material or light sources in general

Related Keywords

controlling intensity of LIGHT

1 direct subcode

Child Classifications

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  • G05D 25/02 characterised by the use of electric means

Top Applicants

Top 10 applicants by patent filingsfor class G05, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SIEMENS DE 4,725
  2. SGCC(STATE GRID CORPORATION OF CHINA) 4,571
  3. FANUC JP 4,233
  4. MITSUBISHI ELECTRIC CORPORATION JP 3,143
  5. FANUC 2,981
  6. ROBERT BOSCH DE 2,813
  7. CHINESE ACADEMY OF SCIENCES 2,500
  8. LG ELECTRONICS KR 2,182
  9. OMRON CORPORATION JP 2,036
  10. SAMSUNG ELECTRONICS COMPANY KR 1,981