US4876481A
Expired / Lapsed
US
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Electroluminescent element
Assignee: Alps Alpine Co Ltd
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Filing: 1988-08-04
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Granted: 1989-10-24
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Expires: 2008-08-04
Abstract
Abstract There is disclosed an electroluminescent element which glows brightly and retains its high luminance over a long period of time. It is characterized in that the phosphor layer contains a cyanoethyl resin as the binder resin and the dielectric layer contains a powder of ferroelectric substance dispersed in a floroplastic as the binder resin. The dielectric layer contains as the binder resin a mixture of a fluoroplastic which is solid at normal temperature and a fluoroplastic which is liquid at normal temperature.
Inventors
- 👤 Yuji Taniguchi
- 👤 Masaru Banju
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:19
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22; H05B33/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
An electroluminescent element comprising: a transparent electrode, an opposed electrode, and a luminous layer interposed between said transparent electrode and said opposed electrode, said luminous layer being composed of a phosphor layer and a dielectric layer, so that application of an electric field across the two electrodes causes the luminous layer to glow, wherein said phosphor layer contains a cyanoethyl resin as the binder resin and said dielectric layer contains a powder of ferroelectric substance dispersed in a mixture of two fluoroplastics, a first of which is solid at normal temperature and a second of which is liquid at normal temperature.
Claim 2
Dependent Claim
101 words
An electroluminescent element comprising: a transparent electrode, an opposed electrode, and a luminous layer interposed between said transparent electrode and said opposed electrode, said luminous layer being composed of a phosphor layer and a dielectric layer, so that application of an electric field across the two electrodes causes the luminous layer to glow, wherein said phosphor layer contains a cyanoethyl resin as the binder resin and said dielectric layer contains a powder of ferroelectric substance dispersed in a mixture of two fluoroplastics, a first of which is solid at normal temperature and a second of which is liquid at normal temperature.
Claim 3
Dependent Claim
82 words
An electroluminescent element comprising: a luminous layer including a phosphor sublayer and a dielectric sublayer, the phosphor sublayer containing phosphor particles and a cyanoethyl resin for binding the phosphor particles; the dielectric sublayer containing a mixture of first and second fluoroplastics, the first fluoroplastic being solid and the second fluoroplastic being liquid; a ferroelectric substance dispersed in the fluoroplastic mixture; a first electrode on one side of the luminous layer; and a second electrode on the opposite side of the luminous layer.
Claim 4
Dependent Claim
82 words
An electroluminescent element comprising: a luminous layer including a phosphor sublayer and a dielectric sublayer, the phosphor sublayer containing phosphor particles and a cyanoethyl resin for binding the phosphor particles; the dielectric sublayer containing a mixture of first and second fluoroplastics, the first fluoroplastic being solid and the second fluoroplastic being liquid; a ferroelectric substance dispersed in the fluoroplastic mixture; a first electrode on one side of the luminous layer; and a second electrode on the opposite side of the luminous layer.
Claim 5
Dependent Claim
15 words
An electroluminescent element as in claim 2 wherein the first fluoroplastic is a solid fluororubber.
Claim 6
Dependent Claim
15 words
An electroluminescent element as in claim 2 wherein the second fluoroplastic is a liquid fluororubber.
Claim 7
Dependent Claim
16 words
An electroluminescent element as in claim 2 wherein the ferroelectric substance is composed of titanium oxide.
Claim 8
Dependent Claim
16 words
An electroluminescent element as in claim 2 wherein the ferroelectric substance is composed of barium titanate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |