GB1476779A – Devices using ferroelectric materials
– Google Patents
GB1476779A – Devices using ferroelectric materials
– Google Patents
Devices using ferroelectric materials
Info
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
1974-12-20
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
Application number
GB5523674A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
1974-12-20
Filing date
1974-12-20
Publication date
1977-06-16
1974-12-20
Application filed by Matsushita Electric Industrial Co Ltd
filed
Critical
Matsushita Electric Industrial Co Ltd
1974-12-20
Priority to GB5523674A
priority
Critical
patent/GB1476779A/en
1977-06-16
Publication of GB1476779A
publication
Critical
patent/GB1476779A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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.
GB5523674A
1974-12-20
1974-12-20
Devices using ferroelectric materials
Expired
GB1476779A
(en)
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)
* Cited by examiner, † Cited by third party
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)
* Cited by examiner, † Cited by third party
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
1977-10-26
PS
Patent sealed
1993-08-18
PCNP
Patent ceased through non-payment of renewal fee
Effective date:
19921220
