US4891635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic display element
Assignee: Daiwa Shinku Corp
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Filing: 1989-03-22
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Granted: 1990-01-02
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Expires: 2009-03-22
Abstract
Abstract An electrostatic display element making use of electrostatic force acting between a movable electrode and a pair of fixed electrodes kept oppositely to each other with said movable electrode positioned therebetween. The movable electrode, which is made of a flexible film plated with thin metallic layers, is supported by a film holder consisting of two contact plates without using an electrically conductive adhesive for the purpose of preventing the movable electrode from being wrinkled owing to the use of the adhesive. To achieve a good electric contact between the movable elecrode and the film holder, at least one of said contact plates is made of electrically conductive elastomer.
Inventors
- 👤 Kazuo Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:13
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/372
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
221 words
An electrostatic display element operating under an electrostatic force produced by an electric voltage imposed between a pair of color-faced fixed electrodes and a bendable film-like electrode positioned between said color-faced fixed electrodes and made of a plastic film plated on both surfaces with a mirror-faced metallic layer, said electrostatic display element comprising: a film holder for providing electric connection between both surfaces of said bendable electrode, said film holder consisting of two electrically conductiing contact plates made to contact respectively with both surfaces of said bendable electrode at its lower portion and extending downwardly over the lower end of said bendable electrode in order to come into contact with each other below the lower end of said bendable electrode, at least one of said electrically conducting contact plates being made of an electrically conducting elastomer, and said film holder being sandwiched between the lower portions of said color-faced fixed electrodes with electrically insulating spacers interposed; and an electric lead plate inserted between said film holder and one of said spacers so as to be in electrical connection with said film holder, said electric lead plate extending downwardly over the lower end of said film holder; whereby said film-like bendable electrode not only has both its surfaces connected electrically but also is mechanically held so as to be free from wrinkles.
Claim 2
Dependent Claim
221 words
An electrostatic display element operating under an electrostatic force produced by an electric voltage imposed between a pair of color-faced fixed electrodes and a bendable film-like electrode positioned between said color-faced fixed electrodes and made of a plastic film plated on both surfaces with a mirror-faced metallic layer, said electrostatic display element comprising: a film holder for providing electric connection between both surfaces of said bendable electrode, said film holder consisting of two electrically conductiing contact plates made to contact respectively with both surfaces of said bendable electrode at its lower portion and extending downwardly over the lower end of said bendable electrode in order to come into contact with each other below the lower end of said bendable electrode, at least one of said electrically conducting contact plates being made of an electrically conducting elastomer, and said film holder being sandwiched between the lower portions of said color-faced fixed electrodes with electrically insulating spacers interposed; and an electric lead plate inserted between said film holder and one of said spacers so as to be in electrical connection with said film holder, said electric lead plate extending downwardly over the lower end of said film holder; whereby said film-like bendable electrode not only has both its surfaces connected electrically but also is mechanically held so as to be free from wrinkles.
Claim 3
Dependent Claim
24 words
An electrostatic display element defined in claim 1, wherein both of said two electrically conducting contact plates are made of an electrically conducting elastomer.
Claim 4
Dependent Claim
34 words
An electrostatic display element defined in claim 1, wherein one of said two electrically conducting contact plates is made of a metallic plate, and said metallic plates also acts as said electric lead plate.
Claim 5
Dependent Claim
46 words
An electrostatic display element defined in claim 1, wherein one of said two electrically conducting contact plates is made of an electrically insulating plate plated with a metallic layer, and said electrically insulating plate plated with a metallic layer also acts as said electric lead plate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |