Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/76—Television signal recording
  • H04N5/80—Television signal recording using electrostatic recording
  • H04N5/82—Television signal recording using electrostatic recording using deformable thermoplastic recording medium
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G13/00—Electrographic processes using a charge pattern
  • G03G13/04—Exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G16/00—Electrographic processes using deformation of thermoplastic layers; Apparatus therefor
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/022—Layers for surface-deformation imaging, e.g. frost imaging
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/07—Polymeric photoconductive materials
  • G03G5/071—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/07—Polymeric photoconductive materials
  • G03G5/071—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • G03G5/072—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising pending monoamine groups
  • G03G5/073—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising pending monoamine groups comprising pending carbazole groups
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
  • G03G5/02—Charge-receiving layers
  • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
  • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
  • G03G5/07—Polymeric photoconductive materials
  • G03G5/071—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • G03G5/072—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising pending monoamine groups
  • G03G5/0732—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising pending monoamine groups comprising pending alkenylarylamine
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
  • G11B11/16—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by mechanical cutting, deforming or pressing
  • G11B11/18—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by mechanical cutting, deforming or pressing with reproducing by optical means
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
  • G11B9/08—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using electrostatic charge injection; Record carriers therefor
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11C—STATIC STORES
  • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
  • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
  • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements

Definitions

• This invention relates to novel methods for recording and reproducing information.
• thermoplastic tape According to a recently proposed method (W. E. Glenn, Journal of Applied Physics, volume 30, pages 1870-1873, 1959), information is recorded in the form of deformations or ripples in the surface of a thermoplastic tape.
• the information can be detected optically by projecting light through these ripples to form a visible image on a screen.
• the tape consists of a high melting base film coated with a metallic conducting layer which is in turn coated with the low melting thermoplastic material.
• an electron gun information can be written on the surface of the thermoplastic layer in the form of a charge pattern.
• electrostatic forces between the charge pattern and the metallic, conductive layer caused deformations or ripples in the tape surface.
• thermoplastic material freezes these deformations, thus yielding a permanent record of the recorded information.
• a modi- -fied Schlieren optical system is employed to project the recorded information on a screen.
• the tape may be erased for reuse by heating the film above its melting point for a period of time suificient to allow the charge pattern to drain away and to allow the surface tension of the thermoplastic layer to smooth out the deformations.
• thermoplastic recording process will be employed to indicate the process described.
• thermoplastic recordation of information on a photoconductive, polymeric material by effecting the thermoplastic recordation of information on a photoconductive, polymeric material.
• the method of the present invention utilizes a low melting, thermoplastic, photoconductive, polymeric material.
• the tape consists of a high melting base 3,441,947 Patented Apr. 29, 1969 ice film coated with a thin, conductive layer which is in turn coated with a photoconductive polymeric layer.
• the use of a photoconductive, polymeric material enables simpler, more efficient recording apparatus than has been heretofore possible in thermoplastic recording processes.
• a uniform electrostatic charge is placed on the surface of the photoconductive layer of the thermoplastic tape by exposure to a charging device, such as a corona generating device.
• a charging device such as a corona generating device.
• the charge in the exposed areas of the tape is dissipated by virtue of the selective increase in conductivity in these areas.
• the tape then contains an image in the form of a charge pattern.
• the tape is then further processed in the manner according to Glenn by first, heating the tape above the melting point of the photoconductive layer to allow deformations or ripples to form in the surface of the tape; second, cooling the tape to freeze these ripples into a permanent record and third, optically detecting the recorded information in a suitable projection apparatus.
• the method of the present invention constitutes an improvement over the prior art process.
• the method of the present invention merely involves simple charging and exposure operations which can be carried out with simple equipment under atmospheric pressure condition.
• the present method is therefore less expensive, more efiicient and less complicated than the prior art methods.
• Photoconductive polymeric materials useful in the process of the present invention include any macromolecular substance or any mixture of macromolecular substances which on exposure to radiation of suitable wavelength exhibits an increase in conductivity.
• the following classes of polymeric substances have been found to be especially useful:
• Vinyl polymers with acetal groups such as, e.g.,
• A represents a divalent radical such as NHCO, NHCONH or 0C0;
• R represents a hydrogen atom or a substituent of the aromatic nucleus such as methoxy group
• R represents a hydrogen atom or a methyl group, such as, e.g.,
• Poly (4-methacrylyloxy) -stilbene Poly p- N'-vinylureido -stilbene] Poly [4-methoxy-4'- (N-acrylyl -aminostilbene] Copolymer of vinyl acetate and p-(N-vinylureido)-stilbene,
• Y represents an oxygen atom or a sulfur atom
• R represents a hydrogen atom or a methyl group, such as, e.g.,
• A represents a divalent radical such as or a single bond
• Q and Q each represents a hydrogen atom, a methyl radical, a nitro group, a phenyl group, a substituted phenyl group, or form together the atoms necessary to close a ring;
• R represents a hydrogen atom or a methyl group
• A represents a single bond or CH CH OCO;
• Q Q and Q each represents a hydrogen atom or a phenyl nucleus; and
• R represents a hydrogen atom or a methyl group, such 4 as, e.g.,
• Y represents a single bond, 3.
• sulphur atom or a carbonyl Z represents a carbonyl group or a nitrogen atom substituted by a lower alkyl radical; and R represents a hydrogen atom or a methyl group, such as, e.g.,
• Nitrated terpolymer (vinyl acetate/styrene/maleic anhydride),
• A represents a single bond, or a divalent organic radical such as, e.g.,
• R and R each represents a hydrogen atom or a lower alkyl radical such as, e.g., a methyl radical;
• Z represents a sulphur atom or a single bond;
• Z represents a rnethine group or a nitrogen atom;
• Q and Q together represent the atoms necessary to complete an aromatic nucleus; and
• Q and Q together represent the atoms necessary to complete an aromatic nucleus, such as, e.g.,
• A represents an aromatic nucleus such as, e.g., a benzene nucleus or a heterocyclic nucleus such as a carbazole nucleus;
• B represents an aromatic nucleus such as e.g., a benzene, a naphthalene or anthracene nucleus, or a heterocyclic nucleus such as, e.g., a carbazole, phenothiazine or quinoline nucleus;
• R represents a hydrogen atom or a lower alkyl radical such as, e.g., a methyl radical
• n and m each represents a positive integer from 1 to 2
• Polyesters such as, e.g.,
• Copolyester of terephthalic acid and diphenyl-p,p'-disulphonic acid with 2,2-di(4-hydroxyphenyl)-propane Copolyester of diphenyl-p,p'-disulph0nic acid and diphenyl ether-p,p'-disulphonic acid with 2,2-di(4-hydroxyphenyl)-propane and 2,2-di(4-hydroxyphenyl)-butane
• Copolyester of 2,2-di(4-hydroxy-3,S-dibromophenyl)-propane and 2,2-di(4-hydroxyphenyl)-propane with isophthalic acid isophthalic acid.
• Copolyester of fluorene-3,6-disulphonic acid and diphenylp,p-disulphonic acid with 2,2-di(4-hydroxyphenyl)- propane
• Cellulose-derivatives such as, e.g., Cellulose-aceto-N-phenylcarbamate, Cellulose-acetocinnamate.
• thermoplastic photoconductive polymers may be employed in combination with substances increasing their sensitivity, such substances are, e.g., mentioned in the British patent specifications 964,871-964,875 and 964,877.
• the tape may consist solely of self-supported photoconductive polymeric material or it may consist of the photoconductive polymeric material coated upon a high melting base film such as one sold under the trademark Mylar or Cronar, for example. In either case, it is necessary that the photoconductive polymeric layer be in intimate surface contact with a conductive backing. Any metallic or similar conductor, such as copper or aluminium for example, may be employed. Should the tape comprise a self-supporting photoconductive polymeric material, its thickness should be sufiicient to allow heating of the surface on which information is recorded only to a fraction of the thickness, so that the tape will remain in a selfsupporting state. Unually tapes of a thickness of 10 to p. will suffice.
• Recordation of information can be achieved simply, economically and efiiciently by any method involving exposure of the photoconductive material to a pattern of electro-magnetic radiation rendering the polymer conductive and by bringing about a charge condition of the unexposed areas.
• the recording medium may be uniformly charged by passing thereover a corona generating device. Either a positive or negative electrostatic charge may be laid upon the film. Subsequently, the charged film is image-wise exposed to electromagnetic radiation of suitable wavelength. The radiation struck areas of the photoconductor, being rendered conductive thereby, charge is carried oil. The unexposed areas of the film remain charged.
• the photoconductive film may first be exposed image-wise to electromagnetic radiation, thus rendering the light struck areas conductive and subsequently, uniformly charged with a corona generating device. No charge will be laid down on the conductive, radiation struck areas of the film and an image comparable to that produced by the method described above will occur.
• Reproduction of the recorded image may be accomplished by means of any conventional optical projection system.
• any conventional optical projection system For example, a system based upon the principles of phase diffraction grating whereby visible light, diffracted by the ripples in the photoconductive medium is permitted to shine upon a screen while light which passes through smooth, nondeformed areas of the film is not permitted to shine upon the screen, a visible reproduction of the recorded information is produced.
• the recorded electrostatic latent image in the photoconductive layer should be built up line-wise by exposure, e.g., to a light spot of a flying spot scanner. Such a method will yield a ripple image adapted for reproduction in a phase diffraction system. It is to be understood, however, that any suitable and conventional optical projection system may be employed to reproduce the ripple image.
• thermoplastic layer of the following composition:
• the dried photoconductive layer has a thickness of 1.5 to 2 microns.
• the material is charged by means of a corona generating device and a latent electrostatic record of information is created by selectively carrying otf electric charge from the material using a light spot (flying spot scanner).
• the material is then heated to the melting point of the polymeric material and after the deformations have set in according to the charge pattern, the material is cooled to freeze the deformations.
• Reproduction of the image is accomplished by employing projection apparatus such as that described by W. E. Glenn.
• the material is erased by melting the polymeric material above its melting point while exposing it to light. Subsequent, recordations on the erased tape by this same described method, produced excellent images.
• a process for recording optical information on a deformable layer in the form of a relief pattern which comprises electrostatically charging a layer of a thermoplastic photoconductive polymeric layer superimposed upon a layer of conductive material before or after said layer is subjected to electromagnetic radiation to which said photoconductive layer is sensitive in a pattern according to said information to be recorded so as to produce on said layer an electrostatic charge pattern in accordance with the information to be recorded, heating said material to a degree suflicient to soften at least the surface layer of the polymeric said layer whereby said softened surface layer is deformed physically under the influence of the electrostatic forces existing between the charge pattern at the surface of said photoconductive layer and said conductive layer, and cooling said heated layer to fix the deformations therein.
• polymeric layer additionally contains a radiation sensitive substance.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Photoreceptors In Electrophotography (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=26252692

Family Applications (1)

Country Status (7)

Cited By (1)

Citations (3)

• 0
  • NL NL264844D patent/NL264844A/xx unknown
  • BE BE603891D patent/BE603891A/xx unknown
• 1960
  • 1960-05-17 GB GB2348660A patent/GB964881A/en not_active Expired
  • 1960-05-17 GB GB1745260A patent/GB964880A/en not_active Expired
• 1961
  • 1961-05-15 SE SE509661A patent/SE311180B/xx unknown
  • 1961-05-16 DE DE19611424387 patent/DE1424387A1/de active Pending
  • 1961-05-17 FR FR862083A patent/FR1314384A/fr not_active Expired
• 1964
  • 1964-11-23 SE SE1412764A patent/SE315312B/xx unknown
• 1965
  • 1965-10-07 US US3441947D patent/US3441947A/en not_active Expired - Lifetime

Patent Citations (3)

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