In this section, the following term is used with the meaning indicated:
"variable" (as a noun) means a feature or property (e.g., a dimension, a physical condition such as temperature, a quality such as density or colour) which, in respect of a particular entity (e.g., an object, a quantity of a substance, a beam of light) and at a particular instant, is capable of being measured; the variable may change, so that its numerical expression may assume different values at different times, in different conditions or in individual cases, but may be constant in respect of a particular entity in certain conditions or for practical purposes (e.g., the length of a bar may be regarded as constant for many purposes).
Attention is drawn to the definitions of terms or expressions used, appearing in the notes of several of the classes in this section, in particular those of "measuring" in class Fulltext... Hierarchy... Expanded...G01 and "control" and "regulation" in class Fulltext... Hierarchy... Expanded...G05.
Classification in this section may present more difficulty than in other sections, because the distinction between different fields of use rests to a considerable extent on differences in the intention of the user rather than on any constructional differences or differences in the manner of use, and because the subjects dealt with are often in effect systems or combinations, which have features or parts in common, rather than "things", which are readily distinguishable as a whole. For example, information (e.g., a set of figures) may be displayed for the purpose of education or advertising (Fulltext... Hierarchy... Expanded...G09), for enabling the result of a measurement to be known (Fulltext... Hierarchy... Expanded...G01), for signalling the information to a distant point or for giving information which has been signalled from a distant point (Fulltext... Hierarchy... Expanded...G08). The words used to describe the purpose depend on features that may be irrelevant to the form of the apparatus concerned, for example, such features as the desired effect on the person who sees the display, or whether the display is controlled from a remote point. Again, a device which responds to some change in a condition, e.g., in the pressure of a fluid, may be used, without modification of the device itself, to give information about the pressure (Fulltext... Hierarchy... Expanded...G01L) or about some other condition linked to the pressure (another subclass of class Fulltext... Hierarchy... Expanded...G01, e.g., Fulltext... Hierarchy... Expanded...G01K for temperature), to make a record of the pressure or of its occurrence (Fulltext... Hierarchy... Expanded...G07C), to give an alarm (Fulltext... Hierarchy... Expanded...G08B), or to control another apparatus (Fulltext... Hierarchy... Expanded...G05).
The classification scheme is intended to enable things of a similar nature (as indicated above) to be classified together. It is therefore particularly necessary for the real nature of any technical subject to be decided before it can be properly classified.
In this subclass, the following terms or expressions are used with the meanings indicated:
"simple lens or prism" means a single lens or prism;
"compound lens or prism" means an optical member, the constituents of which either are close together without air-space or (except in group Fulltext... Hierarchy... Expanded...G02B 11/00) are "in broken contact", i.e. with the air-space between the constituents having no essential optical influence;
"objective" means a lens or an optical system designed to produce a real image of a real object;
"eyepiece" means a lens or an optical system designed to produce a virtual image for viewing by the eye or by another optical system;
"front" or "rear" is determined by looking from the more distant conjugate.
Optical elements characterised by the material of which they are made (compositions of optical glasses Fulltext... Hierarchy... Expanded...C03C 3/00); Optical coatings for optical elements
with wavelength selective means (for optical elements in use, see the relevant subgroups of this subclass; optical wavelength-division multiplexing systems Fulltext... Hierarchy... Expanded...H04J 14/02) [6]
Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables (cables incorporating electric conductors and optical fibres Fulltext... Hierarchy... Expanded...H01B 11/22) [4]
G02B 6/46
·
Processes or apparatus adapted for installing optical fibres or optical cables (installation of cables containing electric conductors and optical fibres Fulltext... Hierarchy... Expanded...H02G) [6]
G02B 6/48
· ·
Overhead installation [6]
G02B 6/50
· ·
Underground or underwater installation; Installation through tubing, conduits or ducts [6]
G02B 6/52
· · ·
using fluid, e.g. air [6]
G02B 6/54
· · ·
using mechanical means, e.g. pulling or pushing devices [6]
P:150
G02B 7/00
Mountings, adjusting means, or light-tight connections, for optical elements
G02B 7/02
·
for lenses
G02B 7/04
· ·
with mechanism for focusing or varying magnification [2]
G02B 7/06
· · ·
Focusing binocular pairs
G02B 7/08
· · ·
adapted to co-operate with a remote control mechanism
by relative axial movement of several lenses, e.g. of varifocal objective lens
G02B 7/105
· · · ·
with movable lens means specially adapted for focusing at close distances [4]
G02B 7/12
· ·
Adjusting pupillary distance of binocular pairs
G02B 7/14
· ·
adapted to interchange lenses
G02B 7/16
· · ·
Rotatable turrets
G02B 7/18
·
for prisms; for mirrors
G02B 7/182
· ·
for mirrors (optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light Fulltext... Hierarchy... Expanded...G02B 26/00) [5]
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
by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective [4]
G02B 15/15
· ·
compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation [4]
G02B 15/16
· ·
with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group (Fulltext... Hierarchy... Expanded...G02B 15/22 takes precedence) [4]
G02B 15/163
· · ·
having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group (Fulltext... Hierarchy... Expanded...G02B 15/177 takes precedence) [4]
G02B 15/167
· · · ·
having an additional fixed front lens or group of lenses [4]
G02B 15/17
· · · · ·
arranged + –– [4]
G02B 15/173
· · · · ·
arranged + – + [4]
G02B 15/177
· · ·
having a negative front lens or group of lenses [4]
G02B 15/20
· · ·
having an additional movable lens or lens group for varying the objective focal length [4]
G02B 15/22
· ·
with movable lens means specially adapted for focusing at close distances [4]
G02B 15/24
· · ·
having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group [4]
Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems (adjusting means being part of the system to be assembled Fulltext... Hierarchy... Expanded...G02B 7/00) [3]