EP0455824A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Frost image recording medium and method and apparatus for preparing and reading frost image
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1990-11-29
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Granted: —
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Expires: 2010-11-29
Abstract
Abstract A data recording medium (2) is manufactured by laminating an electrode (2b) and a recording layer (2a) of a pinene polymer having a molecular weight of 500 ∼ 10,000 on a support (2c). By thermal development, a thermally stable frost image can be produced without causing attenuation of data charge generated on the resin surface. Transmitted or reflected light can be accordingly used for reproduction of the frost image, without provision of a photoconductive layer coloration of which has bad influence. Since voltage impression exposure is made, the degree of uneveness of the frost image changes in accordance with the exposure value. Therefore, a tone wedge effect can be provided and high resolution can be obtained. It is thus possible to produce high-quality and high-fidelity OHP transparencies, microfilms, slide films, and so forth.
Inventors
- 👤 Hiroyuki c/o Dai Nippon Printing Co. Ltd. OBATA
- 👤 Minoru C/O Dai Nippon Printing Co. Ltd. Utsumi
- 👤 Masayuki c/o Dai Nippon Printing Co. Ltd. IIJIMA
- 👤 Masato C/O Dai Nippon Printing Co. Ltd. Okabe
- 👤 Hironori c/o Dai Nippon Printing Co.Ltd KAMIYAMA
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:31
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00795; G; G03; G03G; G03G16/00; G03G5/00; G03G5/02; G03G5/022
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
69 words
An information recording medium comprising a pinene polymer recording layer having a molecular weight of 500 to 10000, which is stacked on an electrode, wherein, after an information electric charge is stored on the surface of said recording layer, said pinene polymer is heated or left in a solvent vapor, thereby forming a frost-shaped visible image corresponding to said information electric charge on the surface of said recording layer.
Claim 2
Dependent Claim
42 words
An information recording medium according to Claim 1, wherein said information electric charge is stored by means of exposure that is carried out under the application of a voltage with said medium being disposed face-to-face with a photosensitive member having an electrode.
Claim 3
Dependent Claim
21 words
An information recording medium according to Claim 1, wherein said electrode is a silicon substrate having been subjected to thermal oxidation.
Claim 4
Dependent Claim
75 words
A frost image forming method in which an information recording medium having a thermoplastic resin layer formed with an electrostatic latent image is distorted by heating to form a frost image thereon and thereafter cooled to fix said frost image, characterized in that, during the thermal development for forming said frost image through distortion, an electrical conductor is disposed face-to-face with the side of said thermoplastic resin layer where said electrostatic latent image is formed.
Claim 5
Dependent Claim
33 words
A frost image forming method according to Claim 4, wherein said conductor is uniform and has an area which is equal to or larger than the area of the frost image forming portion.
Claim 6
Dependent Claim
17 words
A frost image forming method according to Claim 4, wherein said conductor is formed in a pattern.
Claim 7
Dependent Claim
91 words
A frost image forming method in which an information recording medium having a thermoplastic resin layer formed with an electrostatic latent image is distorted by heating to form a frost image thereon and thereafter cooled to fix said frost image, characterized in that, during the thermal development for forming said frost image through distortion, an insulator is disposed face-to-face with the side of said thermoplastic resin layer where said electrostatic latent image is formed, said insulator being stored with electric charge which is opposite in polarity to said electrostatic latent image.
Claim 8
Dependent Claim
19 words
A frost image forming method according to Claim 7, wherein said insulator is stored with said electric charge uniformly.
Claim 9
Dependent Claim
24 words
A frost image forming method according to Claim 7, wherein said insulator is stored with said electric charge in the form of a pattern.
Claim 10
Dependent Claim
88 words
A frost image forming method in which an information recording medium having a thermoplastic resin layer formed with an electrostatic latent image is distorted by heating to form a frost image thereon and thereafter cooled to fix said frost image, characterized in that, during the thermal development for forming said frost image through distortion, an electrical conductor is disposed face-to-face with the side of said thermoplastic resin layer where said electrostatic latent image is formed and a voltage is applied between said conductor and said information recording medium.
Claim 11
Dependent Claim
33 words
A frost image forming method according to Claim 10, wherein said conductor is uniform and has an area which is equal to or larger than the area of the frost image forming portion.
Claim 12
Dependent Claim
17 words
A frost image forming method according to Claim 10, wherein said conductor is formed in a pattern.
Claim 13
Dependent Claim
78 words
A frost image forming method in which an information recording medium having a thermoplastic resin layer, which is disposed face-to-face with a photosensitive member having a photoconductive layer, is formed with an electrostatic latent image by exposure under the application of a voltage and then distorted by heating to form a frost image thereon and thereafter cooled to fix said frost image, characterized in that electric charge is stored on said information recording medium in advance by pre-charging.
Claim 14
Dependent Claim
28 words
A frost image forming method according to Claim 13, wherein the electric charge that is stored by pre-charging is either identical or opposite to said electrostatic latent image.
Claim 15
Dependent Claim
25 words
A frost image forming method according to Claim 13 or 14, wherein said information recording medium is previously stored with electric charge uniformly by pre-charging.
Claim 16
Dependent Claim
30 words
A frost image forming method according to Claim 13 or 14, wherein said information recording medium is previously stored with electric charge in the form of a pattern by pre-charging.
Claim 17
Dependent Claim
23 words
A frost image forming method according to Claim 13, wherein said information recording medium is previously stored with electric charge by corona discharge.
Claim 18
Dependent Claim
41 words
A frost image forming method according to Claim 13, wherein said information recording medium is previously stored with electric charge by applying a voltage between said information recording medium and an electrically conductive electrode, which are disposed face-to-face with each other.
Claim 19
Dependent Claim
42 words
A frost image forming method according to Claim 13, wherein said information recording medium is previously stored with electric charge by applying a voltage between said information recording medium and said photosensitive member in a state where no exposure is carried out.
Claim 20
Independent Claim
48 words
A method of optically reading a frost image which is formed by forming distortions on a thermosoftening resin layer by heating and then fixing the distortions by cooling, characterized by scanning the surface of said thermosoftening resin layer with laser light and reading the transmitted or reflected light.
Claim 21
Independent Claim
87 words
A method for making an original for an overhead projector, comprising the steps of: disposing a photosensitive member having an electrically conductive layer and a photoconductive layer, which are successively formed on a substrate, face-to-face with an information recording medium and effecting image exposure with a voltage being applied between said photosensitive member and said information recording medium, thereby forming an electrostatic charge image on said information recording medium; and heating said information recording medium formed with said electrostatic charge image to form a frost image thereon.
Claim 22
Dependent Claim
46 words
An overhead projector original making method according to Calim 21, wherein, during the heating process, an electrical conductor is disposed face-to-face with the surface of said information recording medium where said electrostatic charge image is formed, and said conductor and said information recording medium are grounded.
Claim 23
Independent Claim
83 words
An apparatus for making an original for an overhead projector, comprising: a photosensitive member having an electrically conductive layer and a photoconductive layer, which are successively formed on a substrate; an information recording medium which is disposed face-to-face with said photosensitive member; a power supply for applying a voltage between said photosensitive member and said information recording medium; an optical system for subjecting said photosensitive member to image exposure; and means for heating said information recording medium formed with an electrostatic charge image.
Claim 24
Dependent Claim
19 words
An overhead projector original making apparatus according to Claim 23, further comprising means for feeding said information recording medium.
Claim 25
Dependent Claim
42 words
An overhead projector original making apparatus according to Claim 24, wherein the surface of said photosensitive member that faces said information recording medium is cylindrical or paraboloidal, said photosensitive member being subjected to slit scanning expoure or intensity modulation scanning beam exposure.
Claim 26
Dependent Claim
34 words
An overhead projector original making apparatus according to Claim 24, wherein said photosensitive member is an elongate member with a small width and subjected to slit scanning expoure or intensity modulation scanning beam exposure.
Claim 27
Dependent Claim
162 words
An original making apparatus characterized by comprising: a drum-shaped photosensitive member having a photoconductive layer and a spacer, which are successively stacked on a drum having an electrically conductive layer formed on the surface thereof; means for pre-charging an information recording medium having an electrically conductive layer and a thermoplastic resin layer, which are successively stacked on a substrate, said information recording medium being sequentially fed in such a manner that said thermoplastic resin layer comes into contact with at least a part of said drum-shaped photosensitive member; means for short-circuiting said charged information recording medium with said electrically conductive layer of said drum-shaped photosensitive member; exposure means; and means for heating said exposed information recording medium; and in that image exposure is effected in a state where said pre-charged information recording medium and said electrically conductive layer of said drum-shaped photosensitive member are short-circuited with each other, and then thermal development is effected to form a positive frost dimple pattern image.
Claim 28
Dependent Claim
20 words
An original making apparatus according to Claim 27, further comprising a spacer which is stacked on said information recording medium.
Claim 29
Dependent Claim
20 words
An original making apparatus according to Claim 27, further comprising means for erasing the potential on said drum-shaped photosensitive member.
Claim 30
Dependent Claim
27 words
An original making apparatus according to Claim 27 or 28, wherein said original is an original for an overhead projector, or a microfilm or a transmission slidefilm.
References Cited (Backward Citations)
No citation records indexed.
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