|  | G |
SECTION G — PHYSICS

|  | G |
Note(s) 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.

INSTRUMENTS

|  | G09 |
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS

|  | G09G |
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (lighting in general Fulltext... Hierarchy... Expanded...F21; arrangements for displaying electric variables or waveforms Fulltext... Hierarchy... Expanded...G01R 13/00; devices or arrangements for the control of light beams Fulltext... Hierarchy... Expanded...G02F 1/00; indicating of time by visual means Fulltext... Hierarchy... Expanded...G04B 19/00, Fulltext... Hierarchy... Expanded...G04C 17/00, Fulltext... Hierarchy... Expanded...G04G 9/00; arrangements for transferring data between computers and peripheral equipment Fulltext... Hierarchy... Expanded...G06F 3/00; visible signalling arrangements or devices Fulltext... Hierarchy... Expanded...G08B 5/00; traffic control systems Fulltext... Hierarchy... Expanded...G08G; display, advertising, signs Fulltext... Hierarchy... Expanded...G09F, e.g. static indicating arrangements comprising an association of a number of separate sources or light control cells Fulltext... Hierarchy... Expanded...G09F 9/00; static indicating arrangements comprising integral associations of a number of light sources Fulltext... Hierarchy... Expanded...H01J, Fulltext... Hierarchy... Expanded...H01K, Fulltext... Hierarchy... Expanded...H01L, Fulltext... Hierarchy... Expanded...H05B 33/12; circuits in pulse counters for indicating the result Fulltext... Hierarchy... Expanded...H03K 21/18; coding, decoding or code conversion, in general Fulltext... Hierarchy... Expanded...H03M; reproducing a picture or pattern using electric signals representing parts thereof and produced by scanning an original Fulltext... Hierarchy... Expanded...H04N) [3,4,5]

|  | G09G |
Note(s) This subclass covers indicator consoles, i.e. arrangements or circuits for processing control signals to achieve the display, e.g. for the calling up, reception, storage, regeneration, coding, decoding, addressing of control signals. [3] This subclass does not cover the structural details of the indicating devices, such as panels or tubes per se, or assemblies of individual light sources, which are covered by the relevant subclasses, e.g. Fulltext... Hierarchy... Expanded...H01J, Fulltext... Hierarchy... Expanded...H01K, Fulltext... Hierarchy... Expanded...H01L, Fulltext... Hierarchy... Expanded...G02F, Fulltext... Hierarchy... Expanded...G09F, Fulltext... Hierarchy... Expanded...H05B. [3] Contrary to subclass Fulltext... Hierarchy... Expanded...H04N, in which are classified display devices capable of representing continuous brightness value scales, this subclass is limited to devices using only a discrete number of brightness values, e.g. visible/non-visible. [3] The visual effect may be produced by a luminescent screen scanned by an electron beam, directly by controlled light sources, by projection of light, from controlled light sources onto characters, symbols, or elements thereof drawn on a support, or by electric, magnetic, or acoustic control of the parameters of light rays from an independent source. [3]

|  | G09G 1/00 |
Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators (cathode-ray oscilloscopes Fulltext... Hierarchy... Expanded...G01R 13/20; television Fulltext... Hierarchy... Expanded...H04N) [3]

|  | G09G 1/02 |
· | Storage circuits (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G09G 1/06-G09G 1/28 take precedence) [3]

|  | G09G 1/04 |
· | Deflection circuits [3]

|  | G09G 1/06 |
· | using single beam tubes (Fulltext... Hierarchy... Expanded...G09G 1/26, Fulltext... Hierarchy... Expanded...G09G 1/28 take precedence) [3]

|  | G09G 1/07 |
· · | with combined raster scan and calligraphic display [5]

|  | G09G 1/08 |
· · | the beam directly tracing characters, the information to be displayed controlling the deflection as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system [3]

|  | G09G 1/10 |
· · · | the deflection signals being produced by essentially digital means, e.g. incrementally [3]

|  | G09G 1/12 |
· · · | the deflection signals being produced by essentially analogue means [3]

|  | G09G 1/14 |
· · | the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible [3]

|  | G09G 1/16 |
· · · | the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster [3]

|  | G09G 1/18 |
· · · | a small local pattern covering only a single character, and stepping to a position for the following character, e.g. in rectangular or polar co-ordinates, or in the form of a framed star [3]

|  | G09G 1/20 |
· | using multi-beam tubes (Fulltext... Hierarchy... Expanded...G09G 1/26, Fulltext... Hierarchy... Expanded...G09G 1/28 take precedence) [3]

|  | G09G 1/22 |
· | using tubes permitting selection of a complete character from a number of characters [3]

|  | G09G 1/24 |
· | using tubes permitting selection of individual elements forming in combination a character [3]

|  | G09G 1/26 |
· | using storage tubes [3]

|  | G09G 1/28 |
· | using colour tubes [3]

|  | G09G 3/00 |
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes (optical scanning systems in general Fulltext... Hierarchy... Expanded...G02B 26/10) [3]

|  | G09G 3/02 |
· | by tracing or scanning a light beam on a screen [3]

|  | G09G 3/04 |
· | for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments [3]

|  | G09G 3/06 |
· · | using controlled light sources [3]

|  | G09G 3/08 |
· · · | using incandescent filaments [3]

|  | G09G 3/10 |
· · · | using gas tubes [3]

|  | G09G 3/12 |
· · · | using electroluminescent elements (using cathode-ray tubes with phosphor screens Fulltext... Hierarchy... Expanded...G09G 1/00) [3]

|  | G09G 3/14 |
· · · · | Semiconductor devices, e.g. diodes [3]

|  | G09G 3/16 |
· · | by control of light from an independent source [3]

|  | G09G 3/18 |
· · · | using liquid crystals [3]

|  | G09G 3/19 |
· · · | using electrochromic devices [5]

|  | G09G 3/20 |
· | for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix [3]

|  | G09G 3/22 |
· · | using controlled light sources [3]

|  | G09G 3/24 |
· · · | using incandescent filaments [3]

|  | G09G 3/26 |
· · · · | to give the appearance of moving signs [3]

|  | G09G 3/28 |
· · · | using luminous gas-discharge panels, e.g. plasma [3]

|  | G09G 3/29 |
· · · · | using self-shift panels [5]

|  | G09G 3/30 |
· · · | using electroluminescent panels [3]

|  | G09G 3/32 |
· · · · | semiconductive, e.g. diodes [3]

|  | G09G 3/34 |
· · | by control of light from an independent source [3]

|  | G09G 3/36 |
· · · | using liquid crystals [3]

|  | G09G 3/38 |
· · · | using electrochromic devices [5]

|  | G09G 5/00 |
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators (image data processing or generation, in general Fulltext... Hierarchy... Expanded...G06T) [5]

|  | G09G 5/02 |
· | characterised by the way in which colour is displayed [5]

|  | G09G 5/04 |
· · | using circuits for interfacing with colour displays [5]

|  | G09G 5/06 |
· · | using colour palettes, e.g. look-up tables [5]

|  | G09G 5/08 |
· | Cursor circuits [5]

|  | G09G 5/10 |
· | Intensity circuits [5]

|  | G09G 5/12 |
· | Synchronisation between the display unit and other units, e.g. other display units, video-disc players [5]

|  | G09G 5/14 |
· | Display of multiple viewports [5]

|  | G09G 5/16 |
· | Display of right-to-left language [5]

|  | G09G 5/18 |
· | Timing circuits for raster scan displays (specially adapted for television Fulltext... Hierarchy... Expanded...H04N) [5]

|  | G09G 5/20 |
· | Function-generator circuits, e.g. circle generators [5]

|  | G09G 5/22 |
· | characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory [5]

|  | G09G 5/24 |
· · | Generation of individual character patterns [5]

|  | G09G 5/26 |
· · · | for modifying the character dimension, e.g. double width, double height [5]

|  | G09G 5/28 |
· · · | for enhancement of character form, e.g. smoothing [5]

|  | G09G 5/30 |
· · | Control of display attribute [5]

|  | G09G 5/32 |
· · | with means for controlling the display position [5]

|  | G09G 5/34 |
· | for rolling or scrolling [5]

|  | G09G 5/36 |
· | characterised by the display of a graphic pattern, e.g. using an APA, i.e. all-points-addressable memory [5]

|  | G09G 5/38 |
· · | with means for controlling the display position [5]

|  | G09G 5/40 |
· | characterised by the way in which both a pattern determined by character code and another pattern are displayed simultaneously, or either pattern is displayed selectively, e.g. with character code memory and APA, i.e. all-points-addressable, memory [5]