Patents by Inventor Yasushi Shinjo
Yasushi Shinjo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6760565Abstract: An image forming apparatus includes an optical unit which forms an electrostatic latent image on a surface of a photosensitive body, a developing device which supplies a liquid developer on the electrostatic latent image formed by the optical unit, and develops the electrostatic latent image into a develop image, a condensing device which condenses the developer image, and a transfer device which transfers the developer image condensed by the condensing device to a recording medium, while applying a shearing stress to the developer image.Type: GrantFiled: February 28, 2002Date of Patent: July 6, 2004Assignees: Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaInventors: Takeshi Watanabe, Koichi Ishii, Hitoshi Yagi, Mitsunaga Saito, Masahiro Hosoya, Yasushi Shinjo, Haruhi Oooka
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Publication number: 20040110080Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.Type: ApplicationFiled: November 28, 2003Publication date: June 10, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
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Publication number: 20040106059Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.Type: ApplicationFiled: November 28, 2003Publication date: June 3, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
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Patent number: 6725006Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;P [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.Type: GrantFiled: June 13, 2003Date of Patent: April 20, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
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Patent number: 6689526Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.Type: GrantFiled: December 21, 2001Date of Patent: February 10, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
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Publication number: 20030211412Abstract: An image forming apparatus of the present invention having a transferring particle layer forming equipment which forms a transferring particle layer prior to forming a toner layer on a surface of an image recording member, whose coagulation force among the transferring particles in the transferring particle layer is smaller than adhesive force of the transferring particle layer to the image recording member, a development equipment which forms a toner layer on a surface of the image recording member according to image information with a liquid developer in a manner that a part of the toner layer is superimposed on the transferring particle layer and a transfer equipment which transfer the toner layer to a transfer medium together with a part of the transferring particle layer. As a result, high transfer efficiency can be obtained, and an image forming apparatus which realizes high image quality is provided.Type: ApplicationFiled: March 20, 2003Publication date: November 13, 2003Applicant: Kabushiki Kaisha ToshibaInventors: Koichi Ishii, Yasushi Shinjo, Mitsunaga Saito, Haruhi Oooka
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Publication number: 20030206752Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;P [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.Type: ApplicationFiled: June 13, 2003Publication date: November 6, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
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Publication number: 20030206751Abstract: A liquid developer electrophotographic apparatus and method for developing one or more successive color images on a previous color image formed on a latent image retaining body, wherein peeling off the prior color image is prevented by establishing a reversible electrophoretic transfer efficiency of toner particles in the prior toner image to be not greater than 60% in the liquid developer for the successive color image while applying an electrical potential difference between the latent image retaining body and a developing electrode for the successive developing step(s). A resin content of the toner particles forming the previous color image may be selected to achieve the reversible electrophoretic transfer efficiency of 60% or less.Type: ApplicationFiled: April 30, 2003Publication date: November 6, 2003Applicant: Kabushiki Kaisha ToshibaInventors: Haruhi Oooka, Yasushi Shinjo
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Patent number: 6600890Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant ∈p [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.Type: GrantFiled: October 12, 2001Date of Patent: July 29, 2003Inventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
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Patent number: 6600891Abstract: A liquid developer electrophotographic apparatus and method for developing one or more successive color images on a previous color image formed on a latent image retaining body, wherein peeling off the previous color image is prevented by establishing a reversible electrophoretic transfer efficiency of toner particles in the previous toner image to be not greater than 60% in the liquid developer for the successive color image while applying an electrical potential difference between the latent image retaining body and a developing electrode for the successive developing step(s). A resin content and composition of the toner particles forming the previous color image may be selected to achieve the reversible electrophoretic transfer efficiency of 60% or less.Type: GrantFiled: November 21, 2001Date of Patent: July 29, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Haruhi Oooka, Yasushi Shinjo
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Patent number: 6529700Abstract: The present invention provides a liquid carrier removing system which efficiently removes liquid carrier from a liquid developed image on a latent image bearing member, and reduces disturbance of a visible image formed with toner particles. The liquid carrier of the liquid developed image on the latent image bearing member is sucked by an absorbing cylinder, the surface of which is formed by a porous layer and pressed to the bearing member. A vacuum system is coupled to the absorbing cylinder to make the inside of the cylinder be negative pressure. The liquid carrier taken in the absorbing cylinder is sucked and collected inside the cylinder. In order that the pressed region of the absorbing cylinder may not be subjected to the sucking action by the negative pressure, a shield, which covers a part of the inside wall of the absorbing cylinder, is provided. Sucking and removing the liquid carrier of the liquid developed image and collection of the sucked liquid carrier are carried out separately.Type: GrantFiled: June 29, 2001Date of Patent: March 4, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Hideki Nukada, Yasushi Shinjo, Yuko Nomura
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Publication number: 20020191987Abstract: Image forming apparatus which form an image on a substrate and uses a liquid developer containing toner particles and a solvent. One embodiment includes a latent image retaining body, a first developing surface facing the latent image retaining body at a first development station, a latent image forming unit, and a second developing surface facing the latent image retaining body at a second development station. The latent image retaining body has a photosensitive layer which has a dielectric constant &egr;p [C2/Nm2] and an average thickness dp [m]. The photosensitive layer retains an image developed by the first developing surface and a latent image comprising image and non-image regions formed by the latent image forming unit. The second developing surface is supplied with a developing electrical potential having an electrical potential difference &Dgr;V from an electrical potential of non-image region of the latent image.Type: ApplicationFiled: October 12, 2001Publication date: December 19, 2002Applicant: KABUSHI KAISHA TOSHIBAInventors: Masahiro Hosoya, Hitoshi Yagi, Yasushi Shinjo, Haruhi Oh-Oka
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Publication number: 20020164177Abstract: An image forming apparatus comprises an optical unit which forms an electrostatic latent image on a surface of a photosensitive body, a developing device which supplies a liquid developer on the electrostatic latent image formed by the optical unit, and develops the electrostatic latent image into a developer image, a condensing device which condenses the developer image, and a transfer device which transfers the developer image condensed by the condensing device to a recording medium, while applying a shearing stress to the developer image.Type: ApplicationFiled: February 28, 2002Publication date: November 7, 2002Applicant: TOSHIBA TEC KABUSHIKI KAISHAInventors: Takeshi Watanabe, Koichi Ishii, Hitoshi Yagi, Mitsunaga Saito, Masahiro Hosoya, Yasushi Shinjo, Haruhi Oooka
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Publication number: 20020090231Abstract: A liquid developer electrophotographic apparatus and method for developing one or more successive color images on a previous color image formed on a latent image retaining body, wherein peeling off the previous color image is prevented by establishing a reversible electrophoretic transfer efficiency of toner particles in the previous toner image to be not greater than 60% in the liquid developer for the successive color image while applying an electrical potential difference between the latent image retaining body and a developing electrode for the successive developing step(s). A resin content and composition of the toner particles forming the previous color image may be selected to achieve the reversible electrophoretic transfer efficiency of 60% or less.Type: ApplicationFiled: November 21, 2001Publication date: July 11, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Haruhi Oooka, Yasushi Shinjo
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Publication number: 20020086230Abstract: A liquid developer, a method of manufacturing the same and a method and apparatus for forming an image, which can attain high transfer efficiency and appropriate tolerance to repetitive image formation. The liquid developer includes toner particles dispersed in an electrically non-conductive liquid solvent. Each toner particle has a resin particle, which is non-soluble in the liquid developer, and pigment particles formed on the surface of the resin particle, whereby the pigment particles suppress contact between the resin particles. Preferably the resin particles have a glass transition temperature of not less than room temperature. One example of manufacturing the liquid developer includes a step of milling pigment particles in a resin particles dispersion liquid at a process temperature higher than the glass transition temperature of the resin particles, whereby the pigments are formed on the surface of the resin particles.Type: ApplicationFiled: December 21, 2001Publication date: July 4, 2002Applicant: KABUSHHIKI KAISHA TOSHIBAInventors: Yasushi Shinjo, Atsuko Iida, Haruhi Oh-Oka
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Patent number: 6356731Abstract: In an image forming apparatus, a latent image is formed on a rotatable photosensitive body and treated with a liquid developer containing a carrier solution and toner particles, whereupon a visible image is formed on the body. The visible image is transferred from the photosensitive body to a record medium through the intermediation of an intermediate transfer body. The transfer body has a surface that serves as a transfer medium. As the transfer medium is pressed against the body in a transfer position, the visible image is transferred from the photosensitive body to the transfer medium.Type: GrantFiled: August 18, 2000Date of Patent: March 12, 2002Assignee: Kabushiki Haisha ToshibaInventor: Yasushi Shinjo
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Publication number: 20020025486Abstract: The present invention provides a liquid carrier removing system which efficiently removes liquid carrier from a liquid developed image on a latent image bearing member and reduces disturbance of a visible image formed with toner particles.Type: ApplicationFiled: June 29, 2001Publication date: February 28, 2002Applicant: Kabushiki Kaisha ToshibaInventors: Hideki Nukada, Yasushi Shinjo, Yuko Nomura
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Patent number: 6314253Abstract: Disclosed is image forming apparatus, including a photoconductor, a charger charging the surface of the photoconductor, a light source exposing the charged surface of the photoconductor to light to form a latent image, a developing unit supplying a liquid developing agent containing a liquid component and a solid component onto the photoconductor so as to convert the latent image into a visible image, a liquid component adjusting unit for adjusting the weight of the liquid component of the liquid developing agent on the surface of the photoconductor to meet the relationship of 0.1≦Ml/Ms≦4.0, where Ms represents the weight of the solid component of the developing agent supplied onto the photoconductor, and Ml represents the weight of the Liquid component of the developing agent, and a transfer unit transferring the visible image onto an image carrier.Type: GrantFiled: December 23, 1999Date of Patent: November 6, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Hosoya, Hitoshi Yagi, Takeshi Watanabe, Yasushi Shinjo, Haruhi Oh-oka
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Patent number: 6272304Abstract: An image forming apparatus with high release characteristic of a toner image, which can acquire a good imprint for a long time, is provided. In the image forming apparatus using the liquid development method, by giving release agent under the visible image formed by the liquid development, which forms release layer on latent image support before development, and is, the image forming apparatus with high release characteristic of a toner image, which can acquire good transfer characteristic for a long time, is realized.Type: GrantFiled: February 24, 2000Date of Patent: August 7, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Mitsunaga Saito, Masahiro Hosoya, Yasushi Shinjo, Hitoshi Yagi, Koichi Ishii
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Patent number: 6246845Abstract: An electrophotographic machine including an image forming device configured to form a latent electrostatic image on a latent image carrier, a developing unit configured to develop a visible image from the latent electrostatic image on the latent image carrier with a liquid developer, and a pressure roller configured to apply pressure to an intermediate transfer medium disposed between the latent image carrier and the pressure roller. Further, a contact pressure between the intermediate transfer medium and the pressure roller is larger than a contact pressure between the intermediate transfer medium and the latent image carrier.Type: GrantFiled: September 17, 1999Date of Patent: June 12, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Hosoya, Mitsunaga Saito, Yasushi Shinjo, Takashi Sasaki, Hirohisa Miyamoto, Koichi Tsunemi