Patent US5444567A successfully refreshed from Google Patents.
US5444567A
Expired / Lapsed
US
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Light control device
Assignee: Koki Holdings Co Ltd
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Filing: 1992-11-09
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Granted: 1995-08-22
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Expires: 2012-11-09
Abstract
Abstract A light control device including an electro-optical material, a light refraction device mounted on the surface of the electro-optical material and electrodes provided on respective front and back major surfaces of the electro-optical material. A waveguide layer may be formed on the electro-optical material, with one electrode formed on an upper major surface of the waveguide layer and another electrode on the lower major surface of the electro-optical material. A prism or a diffraction grating may be used as the light refraction device. The light control device is particularly useful in laser printers and optical disk devices.
Inventors
- 👤 Keiji Kataoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29; G02F1/295; G02F2202/00; G02F2202/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
69 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape, a waveguide layer interposed between at least one of said electrodes and said crystal material; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 2
Dependent Claim
69 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape, a waveguide layer interposed between at least one of said electrodes and said crystal material; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 3
Dependent Claim
32 words
A light control element as claimed in claim 1, further comprising a light incident means provided on said upper surface of said crystal material, for directing the light into said crystal material.
Claim 4
Dependent Claim
19 words
A light control element as claimed in claim 2, wherein said light incident means comprises at least one prism.
Claim 5
Dependent Claim
32 words
A light control element as claimed in claim 1, further comprising a light incident means provided on said upper surface of said waveguide layer for guiding the light into said crystal material.
Claim 6
Dependent Claim
19 words
A light control element as claimed in claim 4, wherein said light incident means comprises at least one prism.
Claim 7
Dependent Claim
19 words
A light control element as claimed in claim 4, wherein said light incident means comprises at least one grating.
Claim 8
Dependent Claim
21 words
A light control element as claimed in claim 1, wherein said crystal material a variable focusing element of a laser printer.
Claim 9
Dependent Claim
30 words
A light control element as claimed in claim 1, wherein said crystal material is one of an eraser element and a recording element of a phase-change type optical disc device.
Claim 10
Dependent Claim
83 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape; and light incident means provided on an upper surface of said crystal material, for directing light into said crystal material, said light incident means comprising at least one prism; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 11
Dependent Claim
83 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape; and light incident means provided on an upper surface of said crystal material, for directing light into said crystal material, said light incident means comprising at least one prism; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 12
Dependent Claim
83 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape; and light incident means provided on an upper surface of said crystal material, for directing light into said crystal material, said light incident means comprising at least one grating; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 13
Dependent Claim
83 words
A light control element, comprising: a crystal material having an electro-optical effect; two electrodes provided on upper and lower surfaces of said crystal material, respectively, at least one of said two electrodes having a circular shape; and light incident means provided on an upper surface of said crystal material, for directing light into said crystal material, said light incident means comprising at least one grating; wherein a light incident within said crystal material is controlled by applying a voltage between said two electrodes.
Claim 14
Dependent Claim
73 words
A light control element, comprising: a crystal material having an electro-optical effect; a first electrode having a circular shape and provided on an upper surface of said crystal material; a second electrode provided on a lower surface of said crystal material; a waveguide layer provided between said crystal material and said first electrode; and light incident means provided on an upper surface of said waveguide layer for guiding light into said waveguide layer.
Claim 15
Dependent Claim
73 words
A light control element, comprising: a crystal material having an electro-optical effect; a first electrode having a circular shape and provided on an upper surface of said crystal material; a second electrode provided on a lower surface of said crystal material; a waveguide layer provided between said crystal material and said first electrode; and light incident means provided on an upper surface of said waveguide layer for guiding light into said waveguide layer.
Claim 16
Dependent Claim
19 words
A light control element as claimed in claim 11, wherein said light incident means comprises at least one prism.
Claim 17
Dependent Claim
18 words
A light control element as claimed in claim 11, wherein said light incident-means comprises at least one grating.
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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) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |