Patent EP0127140A2 successfully refreshed from Google Patents.
EP0127140A2
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EP
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Information holding device
Assignee: Hitachi Ltd
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Filing: 1984-05-24
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Granted: —
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Expires: 2004-05-24
Abstract
Abstract An information holding device comprising a pair of substrates (26, 27), whose opposing surfaces are formed with electrodes (29) on one side and electrodes (30) on the other side so that they may oppose and that opposing parts between the electrodes on the one side and those on the other side may form a matrix as a whole, a dielectric (31) which is held between said pair of substrates, means (21) to change a capacitance of the dielectric in any desired one of the opposing parts, and detection means (20, 23) to simultaneously detect the capacitances of at least two of the opposing parts between the electrodes on the one side and those on the other side.
Inventors
- 👤 Masaaki Kitajima
- 👤 Hideaki Kawakami
- 👤 Yoshiharu Nagae
- 👤 Masahiro Takasaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:43
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C11/00; G11C11/21; G11C11/22; G11C11/24; G11C7/00; G11C7/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
An information holding device comprising a pair of substrates (26, 27) whose opposing surfaces are formed with electrodes (29) on one side and electrodes (30) on the other side so that they may oppose and that opposing parts between the electrodes (29, 30) on the one side and those on the other side may form a matrix as a whole,a dielectric (31) which is held between said pair of substrates (26, 27), means (21) to change a capacitance of the dielectric in any desired one of the opposing parts, and detection means (20, 23) to simultaneously detect the capacitances of at least two of the opposing parts between the electrodes on the one side and those on the other side.
Claim 2
Dependent Claim
120 words
An information holding device comprising a pair of substrates (26, 27) whose opposing surfaces are formed with electrodes (29) on one side and electrodes (30) on the other side so that they may oppose and that opposing parts between the electrodes (29, 30) on the one side and those on the other side may form a matrix as a whole,a dielectric (31) which is held between said pair of substrates (26, 27), means (21) to change a capacitance of the dielectric in any desired one of the opposing parts, and detection means (20, 23) to simultaneously detect the capacitances of at least two of the opposing parts between the electrodes on the one side and those on the other side.
Claim 3
Dependent Claim
74 words
An information holding device according to Claim 1, wherein said pair of substrates (26, 27) are formed with M electrodes on the one side and N electrodes on the other side which oppose to each other, and said detection means (20, 23) is means to simultaneously detect the capacitances of the opposing parts between one electrode on the one side and any desired K (2 S K ≦ N) electrodes on the other side.
Claim 4
Dependent Claim
58 words
An information holding device according to Claim 1, wherein said pair of substrates (26, 27) are formed with M electrodes on the one side and N electrodes on the other side which oppose to each other, and said M electrodes on the one side are divided into blocks each of which includes a plurality of electrodes connected electrically.
Claim 5
Dependent Claim
55 words
An information holding device according to Claim 1, wherein said detection means comprises means (52) to apply a voltage (V R ) varying with time to the at least two opposing parts of said dielectric, and means (55-56). simultaneously detect principally displacement currents (i) flowing through said at least two opposing parts of said dielectric.
Claim 6
Dependent Claim
68 words
An information holding device according to Claim 4, wherein said means (55, 56) to detect the displacement currents comprises a current-to-voltage converter circuit (55a - 55c) which converts the displacement current (i) into a voltage (V a ), and a capacitance discriminating circuit (56a - 56c) which is constructed of a comparator for comparing the voltage (Va) with a reference voltage (V REF ). (Fig. 14, Fig. 15)
Claim 7
Dependent Claim
22 words
An information holding device according to Claim 4, wherein the voltage (VR) varying with time is a voltage whose dV/dt is constant.
Claim 8
Dependent Claim
35 words
An information holding device according to Claim 4, wherein the voltage (V R ) varying with time is a voltage of such an extent of magnitude that the capacitance of said dielectric is scarcely changed.
Claim 9
Dependent Claim
50 words
An information holding device according to Claim 1, wherein said dielectric is a dielectric whose capacitance is changed when an electric field, heat or the like is applied thereto and is stored without changing for a fixed time even after the electric field, heat or the like is removed therefrom.
Claim 10
Dependent Claim
20 words
An information holding device according to Claim 8, wherein said dielectric is a liquid crystal which has a smectic phase.
Claim 11
Dependent Claim
24 words
An information holding device according to Claim 1, wherein said means to change the capacitance of said dielectric is means to heat said dielectric.
References Cited (Backward Citations)
No citation records indexed.
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