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| SECTION G– PHYSICS |
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| G 02 | OPTICS (making optical elements or apparatus B 24 B, B 29 D 11/00, C 03, or other appropriate subclasses or classes; materials per se, see the relevant places, e.g. C 03 B, C 03 C) |
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| Note |
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| In this class, the following expression is used with the meaning indicated: |
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| – | "optical" applies not only to visible light but also to ultra-violet or infra-red radiations. [4] |
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| G 02 B | OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS (G 02 F takes precedence; measuring-instruments, see the relevant subclass of class G 01, e.g. optical rangefinders G 01 C; testing of optical elements, systems, or apparatus G 01 M 11/00; spectacles G 02 C; apparatus or arrangements for taking photographs or for projecting or viewing them G 03 B; sound lenses G 10 K 11/30; electron and ion "optics" H 01 J; X-ray "optics" H 01 J, H 05 G 1/00; optical elements structurally combined with electric discharge tubes H 01 J 5/16, H 01 J 29/89, H 01 J 37/22; microwave "optics" H 01 Q; combination of optical elements with television receivers H 04 N 5/72; optical systems or arrangements in colour television systems H 04 N 9/00; heating arrangements specially adapted for transparent or reflecting areas H 05 B 3/84) |
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| G 02 C | SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES (trial frames for testing the eyes A 61 B 3/04; goggles or eyeshields not having the same features as spectacles A 61 F 9/00) |
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| G 02 F | 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 THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; 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 G 01 D 5/26; devices in which mathematical operations are carried out with optical elements G 06 E 3/00; electrical signal transmission systems using optical means to convert the input signal G 08 C 19/36; information-recording by electric or magnetic means and reproducing by sensing optical properties G 11 B 11/00; static stores using optical elements G 11 C 13/04; transmission systems employing electromagnetic waves other than radio waves, e.g. light, infra-red radiation, H 04 B 10/00; optical multiplex systems H 04 J 14/00; pictorial communication, e.g. television H 04 N) |
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