G
SECTION G — PHYSICS
  
INSTRUMENTS
 G02
OPTICS (making optical elements or apparatus B24B, B29D, C03, or other appropriate sub-classes or classes)
 G02B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS (G02F takes precedence; measuring-instruments, see the relevant sub-class of class G01, e.g. optical rangefinders G01C; testing of optical elements, systems, or apparatus G01M 11/00; spectacles G02C; sound lenses G10K 11/30; electron and ion "optics" H01J; X-ray "optics" H01J, H05G 1/00; optical elements structurally combined with electric discharge tubes H01J 5/16, H01J 29/89, H01J 37/22; microwave "optics" H01Q; combination of optical elements with television receivers H04N 5/72)
 G02B

Note(s)

In this sub-class, the following terms are used with the meanings indicated:

  1. "Simple lens or prism" denotes a single lens or prism.
  2. "Compound lens or prism" denotes an optical member, the constituents of which either are close together without air-space or (except in group G02B 11/00) are "in broken contact", i.e. with the air-space between the constituents having no essential optical influence
  3. "Objective" denotes a lens or an optical system designed to produce a real image of a real object.
  4. "Eyepiece" denotes a lens or an optical system designed to produce a virtual image for viewing by the eye or by another optical system.
  5. "Front" and "rear" are determined by looking from the more distant conjugate.
  6. "Optical" applies not only to visible light but also to ultra-violet and infra-red radiations.


 G02C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES (trial frames for opticians use A61B 3/04; goggles or eyeshields not having the same features as spectacles A61F 9/00)
 G02C

Note(s)

This sub-class also includes contact lenses for the eyes, monocles, pince-nez, and lorgnettes.


 G02F
CONTROLLING THE INTENSITY, COLOUR, PHASE, POLARISATION, OR DIRECTION OF LIGHT BEAMS, e.g. SWITCHING, GATING, MODULATING, OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS (optical transfer means between sensing member and indicating or recording part in connection with measuring G01D 5/26; devices in which mathematical operations are carried out with optical elements G06G 9/00; electrical signal transmission systems using optical means to convert the input signal G08C 19/36; information-recording by electric or magnetic means and reproducing by sensing optical properties G11B 11/00; static stores using optical elements G11C 13/04; transmission systems employing electromagnetic waves other than radio waves, e.g. light, infra-red radiation, H04B 9/00; television H04N)  [2]