GB1476779A - Devices using ferroelectric materials - Google Patents
Devices using ferroelectric materialsInfo
- Publication number
- GB1476779A GB1476779A GB5523674A GB5523674A GB1476779A GB 1476779 A GB1476779 A GB 1476779A GB 5523674 A GB5523674 A GB 5523674A GB 5523674 A GB5523674 A GB 5523674A GB 1476779 A GB1476779 A GB 1476779A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- temperature
- ceramic
- potential
- application
- 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
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
- G02F1/055—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 the active material being a ceramic
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
1476779 Ferroelectric devices MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 20 Dec 1974 55236/74 Heading H1K [Also in Division G2] A device comprises a body 10 of ferroelectric material having two pairs of electrodes on respective opposed surfaces, at least one of the electrodes having a resistance which is responsive to temperature. In the device illustrated in Fig. 1 the electrodes 11, 12 on the major surfaces 13, 14 of the body 10 are both made of a material having either a positive or a negative temperature coefficient of resistance, the resistance variation either being a smooth function of temperature or occurring sharply at a discrete temperature lower than the Curie temperature of the body 10. Suitable selection of ambient temperature results in the electrodes 11, 12 being resistive and enables the body 10 to be polarized in direction 20 by application of a D.C. potential between electrodes 15, 16. Alteration of the temperature such that electrodes 11, 12 become conductive enables the body to be repolarized in direction 21 by the application of a D.C. potential between electrodes 11, 12. If the body 10 and/or the electrodes are made of transparent materials an electro-optical storage or display device may be provided. In particular the body 10 may be of a hot-pressed La-doped lead zirconate-titanate ceramic. If the ceramic is "coarse-grained" an electro-optical effect arises from the dependence of light scattering on orientation of the ceramic polar axis relative to the direction of incident light. If the ceramic is "fine-grained" it exhibits electrically variable birefringence. Suitable positive temperature coefficient materials for the electrodes 11, 12 are Se, (Ba, Sr, Pb)TiO 3 , ZnO-TiO 2 -NiO, paraffins, polyethylene or graphite. Suitable negative temperature coefficient materials are Si, Ge, Ag 2 S, Ag 2 S-CuS, V 2 O, VO, VO 2 , Ti 2 O 3 or isoviolanthrone. The electrodes 15, 16 may be of Au, Ag, or A1. In modifications one or both of the electrodes 11, 12 are transparent and overlie photoconductive layers, e.g. of CdS or CdSe, the application of a potential between electrodes 11, 12 while irradiating the body 10 with a light image or pattern then causing selective repolarization of the body 10 in a pattern corresponding to that of the incident light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5523674A GB1476779A (en) | 1974-12-20 | 1974-12-20 | Devices using ferroelectric materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5523674A GB1476779A (en) | 1974-12-20 | 1974-12-20 | Devices using ferroelectric materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1476779A true GB1476779A (en) | 1977-06-16 |
Family
ID=10473339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5523674A Expired GB1476779A (en) | 1974-12-20 | 1974-12-20 | Devices using ferroelectric materials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1476779A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1749329A1 (en) * | 2004-05-19 | 2007-02-07 | LG Chem, Ltd. | Safety element for battery and battery with the same |
-
1974
- 1974-12-20 GB GB5523674A patent/GB1476779A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1749329A1 (en) * | 2004-05-19 | 2007-02-07 | LG Chem, Ltd. | Safety element for battery and battery with the same |
| EP1749329A4 (en) * | 2004-05-19 | 2011-01-19 | Lg Chemical Ltd | Safety element for battery and battery with the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921220 |