US4752820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium having a liquid crystal layer
Assignee: TDK Corp
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Filing: 1985-02-27
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Granted: 1988-06-21
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Expires: 2005-02-27
Abstract
Abstract An optical recording medium comprising a pair of substrates each having an electrode, the space between the substrate is filled with a high-dielectric liquid crystal to form a rewritable recording layer. The recording medium comprises radiation absorbing means to provide a change of directional orientation of the liquid crystal upon exposure to a laser beam.
Inventors
- 👤 Akihiko Kuroiwa
- 👤 Shigeru Asami
- 👤 Toshiki Aoi
- 👤 Kazuo Takahashi
- 👤 Kenryo Namba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:20
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/25; G11B7/004; G11B7/0055; G11B7/00555; G11B7/246; G11B7/2463; G11B7/2467; G11B7/247; G11B7/2472; G11B7/248; G11B7/249; G11B7/252; G11B7/257
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
An optical recording medium comprising a substrate having an electrode layer thereon, a transparent substrate having a transparent electrode layer thereon, an optical recording layer containing a high-dielectric smectic liquid crystal having a chiral carbon disposed between the electrode layer on the substrate and the transparent electrode layer on the transparent substrate which face each other, and said optical recording medium comprising radiation absorbing means capable of absorbing radiation to product sufficient heat to provide a change of directional orientation of the liquid crystal.
Claim 2
Dependent Claim
84 words
An optical recording medium comprising a substrate having an electrode layer thereon, a transparent substrate having a transparent electrode layer thereon, an optical recording layer containing a high-dielectric smectic liquid crystal having a chiral carbon disposed between the electrode layer on the substrate and the transparent electrode layer on the transparent substrate which face each other, and said optical recording medium comprising radiation absorbing means capable of absorbing radiation to product sufficient heat to provide a change of directional orientation of the liquid crystal.
Claim 3
Dependent Claim
25 words
The optical recording medium of claim 1 wherein said radiation absorbing means comprises a radiation absorbing layer applied to the electrode layer on the substrate.
Claim 4
Dependent Claim
17 words
The optical recording medium of claim 2 wherein said radiation absorbing layer is comprised of a dye.
Claim 5
Dependent Claim
17 words
The optical recording medium of claim 2 wherein said radiation absorbing layer is comprised of a phthalocyanine.
Claim 6
Dependent Claim
25 words
The optical recording medium of claim 1 wherein said radiation absorbing means comprises a radiation absorbing, electroconductive layer which also serves as the electrode layer.
Claim 7
Dependent Claim
17 words
The optical recording medium of claim 2 or 5 wherein said recording layer further contains a dye.
Claim 8
Dependent Claim
14 words
The optical recording medium of claim 6 wherein said dye is a dichroic dye.
Claim 9
Dependent Claim
13 words
The optical recording medium of claim 6 wherein said dye is a phthalocyanine.
Claim 10
Dependent Claim
22 words
The optical recording medium of claim 1 wherein said radiation absorbing means comprises a dye which is contained in said recording layer.
Claim 11
Dependent Claim
14 words
The optical recording medium of claim 9 wherein said dye is a dichroic dye.
Claim 12
Dependent Claim
13 words
The optical recording medium of claim 9 wherein said dye is a phthalocyanine.
Claim 13
Dependent Claim
23 words
The optical recording medium of claim 1 which further comprises a layer of an aligner on at least one of said electrode layers.
Claim 14
Dependent Claim
48 words
The optical recording medium of claim 1 wherein the substrate is provided on its surface having an electrode layer thereon with at least one track, the liquid crystal molecules are normally oriented in one direction in the track and their orientation is changed to another direction when heated.
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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |