IPC 6 English version G02B 7/00-G02B 13/26

G02B00700-G02B01326

SECTION G– PHYSICS

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)

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)

Mountings, adjusting means, or light-tight connections, for optical elements

for lenses

with mechanism for focusing or varying magnification [2]

Focusing binocular pairs

adapted to co-operate with a remote control mechanism

adapted for automatic focusing or varying magnification (automatic generation of focusing signals G 02 B 7/28) [5]

by relative axial movement of several lenses, e.g. of varifocal objective lens

105

with movable lens means specially adapted for focusing at close distances [4]

Adjusting pupillary distance of binocular pairs

adapted to interchange lenses

Rotatable turrets

for prisms; for mirrors

182

for mirrors (optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light G 02 B 26/00) [5]

183

specially adapted for very large mirrors, e.g. for astronomy (G 02 B 7/185, G 02 B 7/192, G 02 B 7/198 take precedence) [6]

185

with means for adjusting the shape of the mirror surface (mirrors with curved faces G 02 B 5/10) [5]

188

Membrane mirrors [5]

192

with means for minimising internal mirror stresses [5]

195

Fluid-cooled mirrors [5]

198

with means for adjusting the mirror relative to its support [5]

Light-tight connections for movable optical elements

Extensible connections, e.g. bellows

Pivoted connections

Systems for automatic generation of focusing signals (measuring distance per se G 01 C, G 01 S; using such signals to control focus of particular apparatus, see the subclasses for the apparatus, e.g. G 03 B, G 03 F) [5]

using parallactic triangle with a base line [5]

using active means, e.g. light emitter [5]

using different areas in a pupil plane [5]

using image sharpness techniques [5]

measured at different points on the optical axis [5]

using time delay of the reflected waves, e.g. of ultrasonic waves [5]

Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – (G 02 B 13/00, G 02 B 15/00 take precedence)

Note

In this group, a component is deemed to be a simple lens or a compound lens or a divided lens equivalent to a simple or to a compound lens.

having one + component only (simple lenses G 02 B 3/00)

having two components only

two + components

arranged about a stop

one + and one – component

having three components only

arranged + – +

all the components being simple

only one component having a compound lens (G 02 B 9/30 takes precedence)

the rear component having the compound

the middle component having the compound

two of the components having compound lenses (G 02 B 9/30 takes precedence)

the front and rear components having compound lenses

the middle and rear components having compound lenses

the middle component being a – compound meniscus having a + lens

the + lens being a meniscus

having four components only

arranged + – – +

Note

In groups G 02 B 9/38, G 02 B 9/44 or G 02 B 9/50 to G 02 B 9/56, the first-mentioned applicable group takes precedence over later-mentioned groups.

both – components being meniscus

one – component being compound

two – components being compound

both – components being biconcave

one – component being compound

two – components being compound

both + components being meniscus

the rear + component being compound

the front + component being compound

all components being simple lenses

arranged – + + –

having five components only

having six components only

having more than six components

11/

Optical objectives characterised by the total number of simple and compound lenses forming the objective and their arrangement (G 02 B 9/00 takes precedence; having only one simple lens G 02 B 3/00)

Note

In this group, lenses in broken contact are counted separately. Simple lenses are denoted by L, compound lenses by C, and the front lens is mentioned first.

11/

having two lenses only

11/

arranged C C

11/

having three lenses only

11/

arranged L L L

11/

arranged L C L

11/

arranged L L C

11/

arranged C L C

11/

arranged C C L

11/

arranged C C C

11/

having four lenses only

11/

arranged L L L L

11/

arranged C L L C

11/

arranged L C C L

11/

arranged C C C C

11/

having five lenses only

11/

having six lenses only

11/

having more than six lenses

13/

Optical objectives specially designed for the purposes specified below (with variable magnification G 02 B 15/00)

13/

Telephoto objectives, i.e. systems of the type + – in which the distance from the front vertex to the image plane is less than the equivalent focal length

13/

Reversed telephoto objectives

13/

Panoramic objectives; So-called "sky lenses"

13/

Anamorphotic objectives

13/

involving prisms (G 02 B 13/12 takes precedence)

13/

with variable magnification

13/

for use with infra-red or ultra-violet radiation (G 02 B 13/16 takes precedence)

13/

for use in conjunction with image converters or intensifiers

13/

with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

13/

Soft-focus objectives (diffusing elements in general G 02 B 5/02)

13/

Telecentric objectives or lens systems

13/

for reproducing or copying at short object distances

13/

for reproducing with unit magnification [3]

G02 - G02B 6/54

G02B 15/00 - G02B 27/64