GB1414894A - Electro-optical devices - Google Patents
Electro-optical devicesInfo
- Publication number
- GB1414894A GB1414894A GB153273A GB153273A GB1414894A GB 1414894 A GB1414894 A GB 1414894A GB 153273 A GB153273 A GB 153273A GB 153273 A GB153273 A GB 153273A GB 1414894 A GB1414894 A GB 1414894A
- Authority
- GB
- United Kingdom
- Prior art keywords
- assembly
- potential difference
- electrode
- layer
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005286 illumination Methods 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 2
- 238000003384 imaging method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/03—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 for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/05—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 for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect with ferro-electric properties
- G02F1/0533—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 for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect with ferro-electric properties structurally associated with a photo-conductive layer
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Facsimile Scanning Arrangements (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
1414894 Modulating light PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 11 Jan 1973 [14 Jan 1972] 1532/73 Heading H4F In an optic relay of the type comprising a variably birefringent electro-optic plate assembly 4, 5 having an electrode 2 on one surface and an electrode 8 spaced from the other surface, and a photosensitive layer 7 arranged with respect to the assembly 4, 5 and electrode 8 so that when it is exposed to an optical image 9 and a potential difference V is applied between the electrodes the plate assembly exhibits a spatially varying birefringence which is determined by the optical image and which is read out using polarized light 6, the capacitance C of the plate assembly, which is in series with the capacitance C<SP>1</SP> between the assembly and the electrode 8, gives rise to a uniform potential difference thereacross even when the photosensitive layer is not illuminated, so that the image eventually read out includes a uniform non-zero background illumination. The prior art method of erasing the birefringent pattern in the plate assembly is to illuminate layer 7 uniformly and apply zero volts between the electrodes. It is now proposed to apply a voltage V<SP>1</SP> between the electrodes while erasing, where V<SP>1</SP> has the opposite polarity to the recording potential difference V. In particular if V<SP>1</SP> = - V<SP>c1</SP> c , application of the potential difference V in a subsequent imaging step causes the background uniform potential difference across the assembly 4, 5, and hence the background illumination of the image read out, to have zero value. As shown, assembly 4, 5 includes a KD*P plate 4 and a dielectric mirror 5. Layer 7 is a photoconductor. Alternatively, as described in Specification 1,387,721, layer 7 may be a photocathode in which case electrode 8 is intermediate layer 7 and plate 4.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7201326A FR2167426B2 (en) | 1972-01-14 | 1972-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1414894A true GB1414894A (en) | 1975-11-19 |
Family
ID=9091963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB153273A Expired GB1414894A (en) | 1972-01-14 | 1973-01-11 | Electro-optical devices |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3855579A (en) |
| JP (1) | JPS4881072A (en) |
| CA (1) | CA991299A (en) |
| DE (1) | DE2301233C3 (en) |
| FR (1) | FR2167426B2 (en) |
| GB (1) | GB1414894A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4731754A (en) * | 1985-09-12 | 1988-03-15 | The United States Of America As Represented By The Secretary Of The Navy | Erasable optical memory material from a ferroelectric polymer |
| US4941735A (en) * | 1989-03-02 | 1990-07-17 | University Of Colorado Foundation, Inc. | Optically addressable spatial light modulator |
| US5179533A (en) * | 1989-07-31 | 1993-01-12 | Radiant Technologies | Read/write optical memory |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3740734A (en) * | 1972-03-15 | 1973-06-19 | Bell Telephone Labor Inc | Coarse grain polycrystalline ferroelectric ceramic optical memory system |
-
1972
- 1972-01-14 FR FR7201326A patent/FR2167426B2/fr not_active Expired
-
1973
- 1973-01-10 CA CA160,946A patent/CA991299A/en not_active Expired
- 1973-01-11 GB GB153273A patent/GB1414894A/en not_active Expired
- 1973-01-11 DE DE2301233A patent/DE2301233C3/en not_active Expired
- 1973-01-12 JP JP607173A patent/JPS4881072A/ja active Pending
- 1973-01-15 US US00323848A patent/US3855579A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3855579A (en) | 1974-12-17 |
| FR2167426A2 (en) | 1973-08-24 |
| JPS4881072A (en) | 1973-10-30 |
| DE2301233C3 (en) | 1978-10-12 |
| DE2301233B2 (en) | 1978-02-16 |
| FR2167426B2 (en) | 1975-10-24 |
| CA991299A (en) | 1976-06-15 |
| DE2301233A1 (en) | 1973-08-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |