US3647430A - METHOD OF THE PREPARATION OF CdS OR CdSe POWDER FOR ELECTROPHOTOGRAPHY AND METHOD OF MAKING AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE PLATE BY USING THE POWDER - Google Patents

METHOD OF THE PREPARATION OF CdS OR CdSe POWDER FOR ELECTROPHOTOGRAPHY AND METHOD OF MAKING AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE PLATE BY USING THE POWDER Download PDF

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US3647430A
US3647430A US734637A US3647430DA US3647430A US 3647430 A US3647430 A US 3647430A US 734637 A US734637 A US 734637A US 3647430D A US3647430D A US 3647430DA US 3647430 A US3647430 A US 3647430A
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powder
cds
cdse
firing
photosensitive plate
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US734637A
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English (en)
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Hiroshi Hanada
Nobuo Kitajima
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Canon Inc
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Canon Camera Co Inc
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    • 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
    • G03G5/08—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic

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  • ABSTRACT CdS or CdSe powders are treated by adding silver or copper as an activator, firing the mixture in the presence of CdCl, or [30] ZnO together with I-ICl, and after washing and drying the June 8, 1967 Japan ..42/36627 resultant powder, firing the dried powder in an atmosphere of S vapor.
  • the powder thus produced is mixing with a bonding U-S. ..96/1-5, resin to form a photosensitive layer and an electrophoto- 5 graphic photoconductive plate is made therefrom.
  • a photoconductive material has been directly considered to be a suitable electrophotographic material.
  • the conventional relation as above that a photoconductive material is always a suitable electrophotographic material is not established. Therefore, it is not appropriate to use a conventional photoconductive member as an electrophotographic material.
  • the object of this invention is to provide a method of preparing CdS or CdSe powder suitable for the preparation of an electrophotographic photoconductive plate used in a method of a persistent internal polarization type.
  • Another object of this invention is to provide a method of making an electrophotographic photoconductive plate by I using the CdS or CdSe powder obtained by the invention.
  • a photoconductive material was prepared by the following three steps, i.e., (i) adding silver or copper as an activating agent (the first firing step), (ii) adding a halogen as a coactivating agent (the second firing step), and (iii) firing in an atmosphere of sulfur vapor to decrease the dark current (the third firing step), or by the above mentioned steps (i) and (ii) excluding the step (iii) when zinc chloride is used as a flux.
  • the step (ii) (introducing a halogen) as mentioned above in the prior art is omitted and only the two steps, that is, the first firing step for adding silver or copper and the third firing step for treating with sulfur vapor, are employed to produce CdS or CdSe powder suitable for an electrophotographic material.
  • the photosensitive plate comprises a support I, a photosensitive layer 2 which is formed by bonding the CdS or CdSe powder prepared by the first method of this invention with a resinous material such as, for example, synthetic resin, and an insulating layer 3.
  • CdS or cdSe powder obtained by the method of this invention are free from dispersion and the powder size is very small.
  • the sharpness of the image is markedly improved and further when the powder thus obtained is used for a photoconductive plate, the resulting photoconductive plate gives an image of high contrast.
  • the process for the preparation is simple as compared with the prior art since the second step is omitted.
  • Example 1 Pure cadmium sulfide l g., cadmium chloride l0 g., ammonium chloride 1 g., cupric chloride 0.03 g., and deionized water 250 cc. are thoroughly mixed, dried, placed in a quartz test tube, fired in an atmosphere of nitrogen for 30 minutes at 600 C., washed with water, dried, screened by a 325 mesh screen, placed together with 0.2 g. of sulfur powder in a quartz test tube, and fired in an atmosphere of nitrogen at 500C. for 10 minutes and then under vacuum for further 10 minutes.
  • Example 2 By using cadmium selenide powder in place of cadmium sulfide, the procedures in Example 1 or Example 2 are repeated.
  • Example 4 Epoxy resin Epikote 815 (trademark for liquid epoxy resin having a molecular weight about 350, viscosity of five through nine poises at 25 C.) containing about 12 percent by weight of an amine series hardener manufactured by Anchor Chemical Co. is added as a bonding agent to CdS powder obtained in Example I or Example 2 at an amount of about 15 percent by weight on the basis of the CdS powder, sufficiently mixed, and the resulting mixture is transferred onto aluminum foil and then rapidly spread and leveled off to a thickness of about u.
  • Epoxy resin Epikote 815 (trademark for liquid epoxy resin having a molecular weight about 350, viscosity of five through nine poises at 25 C.) containing about 12 percent by weight of an amine series hardener manufactured by Anchor Chemical Co. is added as a bonding agent to CdS powder obtained in Example I or Example 2 at an amount of about 15 percent by weight on the basis of the CdS powder, sufficiently mixed, and the resulting mixture is transferred onto aluminum foil and then rapidly spread and level
  • the leveling is carried out by using a frame of thin metal plate as a spacer, covering the above-mentioned mixture with a Mylar (trademark) for polyethylene terephthalate manufactured by Du Pont insulating film of about 25 a in thickness, and leveling off the mixture through the Mylar film with an edge of a metal bar having a wedgelike cross section to form a thin layer.
  • a Mylar trademark for polyethylene terephthalate manufactured by Du Pont insulating film of about 25 a in thickness
  • Example 5 The mixture as used in Example 4 above is put on a Mylar film placed on a flat plate and directly leveled off to form a photosensitive layer. Then, the resulting whole matter is turned upside down and placed on an appropriate support.
  • Example 6 ln Example 4 above, an insulating film such as Mylar is used in place of the metal foil.
  • the photosensitive plate obtained in the above Examples is used to form an electrostatic latent image.
  • the quality of the photosensitive plate and the material used for preparing the photosensitive plate is finally determined.
  • the photosensitive plate as mentioned above is positively charged by corona discharging in a light or dark place, exposed to an image irradiation at an intensity of i0 Iux. sec, and similarly negatively charged by corona discharging. Finally, the whole photosensitive plate is exposed to light.
  • These steps may be considered in view of physical point of view as follows.
  • the positive surface potential formed by the initial charging induces a polarization in the photosensitive plate.
  • This polarization persists at a dark portion of the image when the image irradiation is effected simultaneously with the negative charging. Therefore, the charge at the light portion is changed to negative charge while the negative charging does not proceed at a dark portion due to repulsion of the polarity and a slightly neutralized state appears.
  • electrostatic latent images of negative potential and nearly neutral potential are produced on the photosensitive plate.
  • a method for preparing an electrophotographic photoconductive plate which consists essentially of adding silver or copper as an activator to CdS or CdSe powder, firing the resulting mixture in the presence of at least one member selected from the group consisting of (a) cadmium chloride and (b) zinc oxide together with hydrochloric acid, washing the resultant powder with water, drying said powder, firing the dried powder in an atmosphere of sulfur vapor, mixing a bonding resin with the CdS or CdSe powder and placing the resulting mixture as a photosensitive layer of 50-100 p in thickness between a support and an insulating film.
  • a method according to claim 1 wherein the bonding resin comprises an epoxy resin.
  • the insulating film comprises polyethylene terephthalate.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Light Receiving Elements (AREA)
US734637A 1967-06-08 1968-06-05 METHOD OF THE PREPARATION OF CdS OR CdSe POWDER FOR ELECTROPHOTOGRAPHY AND METHOD OF MAKING AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE PLATE BY USING THE POWDER Expired - Lifetime US3647430A (en)

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JP3662767 1967-06-08

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US3647430A true US3647430A (en) 1972-03-07

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DE (1) DE1772555C3 (https=)
GB (1) GB1174735A (https=)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873473A (en) * 1972-05-15 1975-03-25 Hitachi Ltd Sulphide solid solution having rock-salt structure and method of producing the same
US3907566A (en) * 1971-07-23 1975-09-23 Canon Kk Photosensitive material containing inorganic compound coated metal particles and the use thereof in photographic development processes
US4029604A (en) * 1974-09-04 1977-06-14 Matsushita Electric Industrial Co., Ltd. Method for preparing a photoconductive powder
US4197122A (en) * 1977-04-29 1980-04-08 Canon Kabushiki Kaisha Process for preparing raw particles of cadmium sulfide for electrophotography
US4239844A (en) * 1979-03-05 1980-12-16 Gte Products Corporation Electrophotoconductive Cd S Se materials with Cu and Cl
US4374917A (en) * 1981-12-11 1983-02-22 Gte Products Corporation Infrared photoconductor for electrophotography of a copper activated mercury containing cadmium selenide telluride
WO2011145111A1 (en) * 2010-05-18 2011-11-24 Secretary, Department Of Information Technology (Dit) Micro/nano photoconductor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2292262A1 (fr) * 1974-11-20 1976-06-18 Canon Kk Procede de preparation de sulfure de cadmium utile en electrophotographie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2876202A (en) * 1954-12-01 1959-03-03 Rca Corp Photoconducting powders and method of preparation
GB863004A (en) * 1958-07-28 1961-03-15 Gen Electrical Company Ltd Improvements in or relating to photo-conductive materials and apparatus incorporating the same
US2995474A (en) * 1959-10-02 1961-08-08 Eastman Kodak Co Photoconductive cadmium sulfide and method of preparation thereof
US3238150A (en) * 1962-09-12 1966-03-01 Xerox Corp Photoconductive cadmium sulfide powder and method for the preparation thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2876202A (en) * 1954-12-01 1959-03-03 Rca Corp Photoconducting powders and method of preparation
GB863004A (en) * 1958-07-28 1961-03-15 Gen Electrical Company Ltd Improvements in or relating to photo-conductive materials and apparatus incorporating the same
US2995474A (en) * 1959-10-02 1961-08-08 Eastman Kodak Co Photoconductive cadmium sulfide and method of preparation thereof
US3238150A (en) * 1962-09-12 1966-03-01 Xerox Corp Photoconductive cadmium sulfide powder and method for the preparation thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907566A (en) * 1971-07-23 1975-09-23 Canon Kk Photosensitive material containing inorganic compound coated metal particles and the use thereof in photographic development processes
US3873473A (en) * 1972-05-15 1975-03-25 Hitachi Ltd Sulphide solid solution having rock-salt structure and method of producing the same
US4029604A (en) * 1974-09-04 1977-06-14 Matsushita Electric Industrial Co., Ltd. Method for preparing a photoconductive powder
US4197122A (en) * 1977-04-29 1980-04-08 Canon Kabushiki Kaisha Process for preparing raw particles of cadmium sulfide for electrophotography
US4239844A (en) * 1979-03-05 1980-12-16 Gte Products Corporation Electrophotoconductive Cd S Se materials with Cu and Cl
US4374917A (en) * 1981-12-11 1983-02-22 Gte Products Corporation Infrared photoconductor for electrophotography of a copper activated mercury containing cadmium selenide telluride
WO2011145111A1 (en) * 2010-05-18 2011-11-24 Secretary, Department Of Information Technology (Dit) Micro/nano photoconductor

Also Published As

Publication number Publication date
DE1772555A1 (de) 1970-08-20
DE1772555B2 (https=) 1973-12-06
DE1772555C3 (de) 1974-07-18
GB1174735A (en) 1969-12-17

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