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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 G01D 5/26; devices in which mathematical operations are carried out with optical elements G06E 3/00, [N: G06E 3/001]; 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 10/00; optical multiplex systems H04J 14/00; pictorial communication, e.g. television H04N)
Definition statement
This subclass/group covers:

Devices, the optical operation of which is modified by changing the optical properties (refraction, birefringence, absorption, nonlinear susceptibility) of the medium of the devices.

The term "optical" applies not only to visible light but also to ultra-violet, infra-red radiations or Terahertz (G02F 1/3534).

The following optical elements are therefore covered, the list being not exhaustive:

  • thermo-optic elements.
  • electro-optic elements.
  • magneto-optic elements.
  • elasto-optic elements.
  • acousto-optic elements.
  • liquid crystal devices.
  • electrochromic elements.
  • electrophoretic elements.
  • non-linear optics, i.e. devices or arrangements in which the electric or magnetic field component of the light beam influences the optical properties of the medium.

Demodulating light:Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, insofar these demodulators are based in substantial manner on elements which are provided for under the bullets above.

Optical logic elements:Optical bistable devices, i.e. devices exhibiting two different optical output states for a same optical input value, Optical logic elements, insofar these demodulators are based in substantial manner on elements which are provided for under the bullets above.

Optical analogue/digital converters:Optical bistable devices, i.e. devices exhibiting two different optical output states for a same optical input value, Optical logic elements, insofar these devices are based in substantial manner on elements which are provided for under the bullets above.

Relationship between large subject matter areas

G09F 9/35 covers display having a particular shape and or used for a particular application, mainly for the purpose of advertising (see for example US 2010177018, EP2116985).

G09F 9/37 covers displays using movable (rotatable) elements (see for example EP0721176, US2006176438 or US2010110531).

References relevant to classification in this subclass
This subclass/group does not cover:
Investigating or analysing materials by the use of optical means
Devices with movable or deformable element (DMD; electro-wetting)
Control arrangements or circuits for visual indicators other than cathode-ray tubes
Photoconductive antenna for Terahertz (US2011080329)
Optical Transmission system
Optical multiplex system
Projection devices for colour picture display
Informative references
Attention is drawn to the following places, which may be of interest for search:
Devices in which mathematical operation are carried out with optical elements Optical processing (correlator)
Indicating arrangements for variable information by selection or combination of individual elements
Information-recording and reproducing by sensing optical properties
Control of light sources
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics (thermometers using change of colour or translucency G01K 11/12; using changes in fluorescence G01K 11/32; light guide devices G02B 6/00; optical devices or arrangements using movable or deformable elements for controlling light independent of the light source G02B 26/00; control of light in general G05D 25/00; visible signalling systems G08B 5/00; indicating arrangements for variable information by selection or combination of individual elements G09F 9/00; control arrangements or circuits for visual indicators other than cathode-ray tubes G09G 3/00; control of light sources H01S 3/10, H05B 33/08, H05B 35/00 to H05B 43/00; [N: photochromic filters G02B 5/23; optical logic elements G02F 3/00])
Definition statement
This subclass/group covers:

Devices and methods for the control of intensity, phase, polarisation (G02F 1/01); or direction of light (G02F 1/29).

Devices and methods using nonlinear optical effect (G02F 1/35)

Relationship between large subject matter areas

Light sources (Laser, LED, Lamp) are classified in the appropriate entries

References relevant to classification in this group
This subclass/group does not cover:
Photo luminescent material
Liquid crystal material
Electrochromic material
Integrated optical device with other passive /active optical elements (photonic chip)
Digital stores characterised by the use of electro-optical storage elements
Special rules of classification within this group

The class G02F 1/00 is mainly empty and consists only of materials (except nonlinear materials classified in G02F 1/355) insofar these materials are used in the devices provided for in this subclass.

[N: Materials therefor]
Definition statement
This subclass/group covers:

New materials or compositions used in light modulation devices, see US2011008008, US2013003066, US2011181950, US2008024854.

References relevant to classification in this group
This subclass/group does not cover:
Photoluminescent materials
Liquid crystal materials
Electrochromic materials
Non linear materials
for the control of the intensity, phase, polarisation or colour (G02F 1/29, G02F 1/35 take precedence; polarising elements per se G02B 5/30; static storage per se G11C; image tube screens acting as light valves by shutter operation H01J 29/12; such screens acting by discoloration H01J 29/14; [N: projection arrangements for television image reproduction, e.g. using eidophor H04N 5/74; recording by light G11B 7/00 to G11B 11/00 ])
Definition statement
This subclass/group covers:

Devices and methods for modulating the light (intensity, phase, polarization, color).

Relationship between large subject matter areas

Passive optical element (Color filter, polarizer): G02B

Backlight comprising a light guide: G02B 6/00

Integrated optical element G02B 6/00

Laser: H01S

References relevant to classification in this group
This subclass/group does not cover:
Lighting Device in general
F21
Measuring Instruments characterised by the use of an interferometer
Measuring characteristics of light, e.g. intensity, spectrum
Measuring force or stress by measuring variations of optical properties of material
Holography
Optical transmission system

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Eye protecting filters (Welding Helmet)
Rear-view mirrors
(smart) Windows with controllable transmission
Optical RF spectrum analyser
G01R22/17
Head-up display
Electro-optic spectacle (sunglasses)
Constructional details related to the housing of computer displays, e.g. of of flat displays
Transparent conductive material TCO
Thin film Transistor TFT
H01L 21/00- H01L21/27- H01L21/29
LED Display
Stereoscopy
Detail of television receiver
Electroluminescent Display
Arrangements in which the information is build-up by the combination of elements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Integrated display and digitiser
Active matrix with TFT
H01L21/77T
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
BLU
Backlight Unit
TFT
Thin film transistor
Synonyms and Keywords

In patent documents the following abbreviations are often used:

SOP
State Of Polarization
PDLC
Polymer dispersed Liquid crystal
TCO
Transparent conductive oxide
EA
Electro Absorption
VOA
Variable Optical Attenuator
[N: based on electro-mechanical, magneto-mechanical, elasto-optic effects]
Definition statement:
This subclass/group covers:

Devices where a ( electro, magnetic, pressure ) field produce a deformation of the structure of the material which result in change in refractive index, absorption etc, e.g. elasto-optic effect (mechanically, stress induced birefringence), see WO2012065244, US2004012840, US2004135745

[N: based on thermo-optic effects (G02F 1/132 takes precedence; tenebrescent compositions C09K 9/00; radiation pyrometry G01J 5/00; thermometers using change of colour or translucency G01K 11/12)]
Definition statement
This subclass/group covers:

Thermo optic effect.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Thermometers using change of colour or translucency
based on semiconductor elements with at least one potential jump barrier, e.g. PN, PIN junction (G02F 1/03 takes precedence)
Definition statement
This subclass/group covers:

Electro optic effect in semi conductor, mainly GaAs InP devices.

in an optical waveguide structure (G02F 1/017, [N: G02F 1/2257] take precedence)
Definition statement
This subclass/group covers:

Thermo optic effect,in semi conductor, mainly silicon, devices , see for example US2008112032

based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect (G02F 1/061 takes precedence)
Definition statement
This subclass/group covers:

Device using insulating electro-optic crystals, e.g. made of LiNbO3, LiTtaO3, KTP material

[N: structurally associated with a photoconductive layer or having photo-refractive properties (G02F 1/05 takes precedence)]
Definition statement
This subclass/group covers:

Photo-refractive effect.

with ferro-electric properties (G02F 1/035, G02F 1/055 take precedence; [N: domain inversion in ferro-electric materials G02F 1/3558; ferro-electric digital stores G11C 11/22])
Definition statement
This subclass/group covers:

G02F 1/055 covers device using PLZT ceramic material.

Obsolete technology.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Ferro-electric digital stores
the active material being a ceramic (G02F 1/035 takes precedence)
Definition statement
This subclass/group covers:

Covers device using PLZT ceramic material.

based on electro-optical liquids exhibiting Kerr effect
Definition statement
This subclass/group covers:

Obsolete technology

based on magneto-optical elements, e.g. exhibiting Faraday effect
Definition statement
This subclass/group covers:

Magneto-optic effect

based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves ([N: elasto-optic effect without wave propagation G02F 1/0131;] acousto-optical deflection G02F 1/33 )
Definition statement
This subclass/group covers:

Acousto-optic

based on liquid crystals, e.g. single liquid crystal display cells (liquid crystal materials C09K 19/00)
Definition statement
This subclass/group covers:

Liquid crystal.

Groups in G02F 1/13 are also used to classify common devices features in electrochromic and Electrophoretic device (see for example US2007024954, US20100137569)

Relationship between large subject matter areas
Control arrangement and circuits for Liquid crystal device
Conductors connecting electrodes to cell terminals
Definition statement
This subclass/group covers:

Details of the connection terminals of the LCD.

See for example US2011116028, US2011075089, US2010321624

[N: Conductors connecting driver circuitry and terminals of panels (H01L 21/00 takes precedence; electrical details inside the cell G02F 1/133 ;)
Definition statement
This subclass/group covers:

Detail of the connection of the IC driver or PCB with the terminal pads of the LCD.

Relationship between large subject matter areas

Further details of the PCB (printed circuit board) are in H05K . Further details concerning bonding of the drivers are in H01L 21/00 (see for example US2011108979).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Drivers integrated with an active matrix
G02F1/1362D
TAB tape automated bonding. COB chip-on-board. COG chip-on-glass.
based on electrochromic elements [N: (electrochromic materials C09K 9/00)]
Definition statement
This subclass/group covers:

Electrochromic.

[N: based on electrolytic deposition of a non-organic material on or in the vicinity of an electrode]
Definition statement
This subclass/group covers:

Electroplating RED (Reversible electrodeposition device).

based on electrophoresis
Definition statement
This subclass/group covers:

Electrophoretic

based on variable absorption elements (G02F 1/015 to G02F 1/167 take precedence; [N: tenebrescent compositions C09K 9/00])
Definition statement
This subclass/group covers:

Variable absorption device

[N: based on a suspension of orientable dipolar particles, e.g. suspended particles displays]
Definition statement
This subclass/group covers:

Suspended Particle Display

based on variable reflection or refraction elements ([N: G02F1/01M3], G02F 1/015 to G02F 1/167 take precedence)
Definition statement
This subclass/group covers:

Variable reflection device (switchable mirror using metal hydride)

for the control of the colour (G02F 1/03 to G02F 1/21 take precedence)
Definition statement
This subclass/group covers:

Obsolete technologies

Relationship between large subject matter areas

Led associated with phosphor for the control of the colour of the emitted light are classified in H05B 33/00, F21K 99/00, C09K 11/00; H01L 33/00 (US2008007172)

for the control of the position or the direction of light beams, i.e deflection ([N: optical coupling means G02B 6/26; optical-mechanical scanning in general G02B 26/10]; static stores with electric or magnetic read-in and optical read-out G11C; lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted H01S 3/101)
Definition statement
This subclass/group covers:

Devices and methods for the the control or direction (deflection) of light

- deflection of a light beam that can be spanned over a discrete number (digital) of positions, as opposed to deflection spanned over a continuous range (analog) of positions.

Analog scanner US2008112042 (Electro-optic beam steering) electro active lens US2010226000.

Deflection based on total internal reflection (TIR), producing a yes/no deflection, which is covered by group G02F 1/315.

Relationship between large subject matter areas

Wavelength multiplexer/demultiplexer are classified in G02B26/293W2 for the optical details and in H04Q 11/0001H04J 14/02 for the control details.

References relevant to classification in this group
This subclass/group does not cover:

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Working and shaping a Laser beam
Scanning arrangement
Optical switching system
Informative references
Attention is drawn to the following places, which may be of interest for search:
Optical beam shaping, splitting, combining
Non-linear optics (optical bistable devices G02F 3/02; lasers using stimulated Brillouin or Raman effect H01S 3/30)
Definition statement
This subclass/group covers:

Devices and methods using nonlinear optical processes.

Frequency conversion; Harmonic generation.

Wave mixing.

Optical rectification.

Optical KERR effect.

Self de or /focusing.

Self phase modulation (Soliton propagation).

Cross phase modulation.

nonlinear absorption (optical limiter).

Optical phase conjugation.

Parametric amplification.

References relevant to classification in this group
This subclass/group does not cover:
Brillouin, Raman laser
Photoconductive Terahertz emitter (antenna) (Auston switch)

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Analysing materials by the use of optical means and of the non-linear properties of the material
Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light (G02F 1/35 takes precedence; photoelectric detecting or measuring devices G01J, H01J 40/00, H01L 31/00; demodulating laser arrangements [N:  e.g. switching, gating] H01S 3/10; demodulation or transference of modulation of modulated electro-magnetic waves in general H03D 9/00)
Definition statement
This subclass/group covers:

Demodulating light; Transferring the modulation of modulated light.

Frequency-changing of light, e.g. by quantum counters Up-converter Infrared to visible converter, Down converter.

Frequency-changing of light using nonlinear optical effect G02F 1/35 takes precedence.

References relevant to classification in this group
This subclass/group does not cover:
Measuring optical wavelength
Measuring optical phase difference

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Optical receiver/ transmitter
H04B10/155, H04B10/158
Optical clock arrangement for synchronisation
Optical demodulator for modulated carrier
H04L7/22P
Millimeter wave (RF) generation using optical means (Radio over Fiber system)
H04B10/12R
Demodulator for optical sensor
Informative references
Attention is drawn to the following places, which may be of interest for search:
Pulse train generation using laser
RF synthesysizer
Phase antenna array (US 5859611)
[N: Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter]
Definition statement
This subclass/group covers:

Wavelength converter used to convert the carrier of high-bit-rate data from one wavelength to another see for example US2002085266

Frequency-changing of light, e.g. by quantum counters (luminescent materials  HYPERLINK "sfpluscla://ECLA/C09K 11/00" C09K 11/00 )
Definition statement
This subclass/group covers:

This group class covers:

Frequency-changing of light, e.g. by quantum counters.

Obsolete technology.

Optical logic elements (optical computing G06E); electric pulse generators using opto-electronic devices as active elements H03K 3/42; logic circuits using opto-electronic devices H03K 19/14); Optical bistable devices
Definition statement
This subclass/group covers:

Optical logic elements, i.e. optical basic logic gates, e.g. AND, OR, NAND.

Optical bistable devices i.e. devices exhibiting two different optical output states for a same optical input value.

This group is not active.

References relevant to classification in this group
This subclass/group does not cover:
Logic circuits using opto-electronic devices
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electric-pulse generators using opto-electronic devices as active elements
Optical computing
Optical bistable devices
Definition statement
This subclass/group covers:

Obsolete technology.

Optical analogue/digital converters
Definition statement
This subclass/group covers:

Optical analogue/digital converters (http://www.wipo.int/ipcpub)

This group covers only converters based in substantial manner on elements which are provided for in group G02F 1/00.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Conversion of a code using opto-electronic devices
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Last Modified: 10/11/2013