Patents by Inventor Keita Nozawa
Keita Nozawa 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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Publication number: 20230352865Abstract: According to an embodiment, a high-speed transmission device includes a substrate, a control device on the substrate, a first connector, a second connector; and a cable assembly between the first connector and the second connector. The first connector is disposed at a position near the control device on the substrate and electrically connected to the control device via the substrate. The second connector is disposed at a position away from the control device on the substrate and equipped with an apparatus for transmitting / receiving a signal to and from the control device. The cable assembly includes a cable row, a paddle card substrate and a first conductive resin cover. Cables each transmitting a differential signal are arranged side by side in the cable row. The cables each comprise an internal conductor and an external conductor.Type: ApplicationFiled: February 16, 2023Publication date: November 2, 2023Inventors: Toshiyasu ITO, Osamu SHIMIZU, Yoshihide KUROKI, Keita NOZAWA, Masashi TANAKA, Hiroaki KURIBAYASHI
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Patent number: 7097952Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: GrantFiled: May 10, 2005Date of Patent: August 29, 2006Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Publication number: 20060105259Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and retransfer in multi-color image formation.Type: ApplicationFiled: November 23, 2005Publication date: May 18, 2006Applicant: Canon Kabushiki KaishaInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Patent number: 6972166Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: GrantFiled: December 23, 2003Date of Patent: December 6, 2005Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Publication number: 20050208406Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: ApplicationFiled: May 10, 2005Publication date: September 22, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Publication number: 20040137358Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: ApplicationFiled: December 23, 2003Publication date: July 15, 2004Inventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Patent number: 6706458Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: GrantFiled: October 24, 2002Date of Patent: March 16, 2004Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Publication number: 20030190542Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: ApplicationFiled: October 24, 2002Publication date: October 9, 2003Inventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Patent number: 6555281Abstract: An electrophotographic toner is formed as a blend of toner particles and external additives. The external additives include (1) first inorganic fine particles having an average primary particle size of 80-800 nm of oxide of a metal selected from the group consisting of titanium, aluminum, zinc and zirconium, (2) second inorganic fine particles other than silica having an average primary particle size of below 80 nm and (3) silica fine particles having an average primary particle size of below 30 nm. As a result, the toner can be made free from difficulties, such as melt-sticking onto an image-bearing member in a low humidity environment, roughening of halftone images in a low humidity environment, toner blot-down after storage at high temperatures or in continuous image formation on a large number of sheets, fog in continuous formations of images of low color area percentage in a low humidity environment, and re-transfer in multi-color image formation.Type: GrantFiled: August 2, 2000Date of Patent: April 29, 2003Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Atsushi Kubo, Masanori Ito, Tomoaki Igarashi, Kiyokazu Suzuki
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Patent number: 6541174Abstract: A toner for developing an electrostatic image is formed of toner particles; wherein each toner particle includes (i) 100 wt. parts of a binder resin having a glass transition point (Tg) of 50-70° C., (ii) 0.2-20 wt. parts of solid wax, and (iii) colorant particles or magnetic powder; (iv) lubricant particles carrying a liquid lubricant, so that the toner particle retains at its surface the liquid lubricant gradually released from the particles (iv). The toner may be further blended with an organically treated inorganic fine powder to provide a developer. The toner or developer retains good lubricity and releasability so that it is suitable to be used in an image forming method including means contacting a latent image-bearing means, such as a contact charging means, a contact transfer means or a contact cleaning means.Type: GrantFiled: September 1, 2000Date of Patent: April 1, 2003Assignee: Canon Kabushiki KaishaInventors: Hirohide Tanikawa, Toshiaki Nakahara, Keita Nozawa, Kazuyoshi Hagiwara, Minoru Shimojo, Rika Shinba, Masami Fujimoto, Tsutomu Onuma
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Patent number: 6187496Abstract: A toner for developing an electrostatic image is formed of toner particles; wherein each toner particle includes (i) 100 wt. parts of a binder resin having a glass transition point (Tg) of 50-70° C., (ii) 0.2-20 wt. parts of solid wax, and (iii) colorant particles or magnetic powder, (iv) lubricant particles carrying a liquid lubricant, so that the toner particle retains at its surface the liquid lubricant gradually released from the particles (iv). The toner may be further blended with an organically treated inorganic fine powder to provide a developer. The toner or developer retains good lubricity and releasability so that it is suitable to be used in an image forming method including means contacting a latent image-bearing means, such as a contact charging means, a contact transfer means or a contact cleaning means.Type: GrantFiled: March 20, 1997Date of Patent: February 13, 2001Assignee: Canon Kabushiki KaishaInventors: Hirohide Tanikawa, Toshiaki Nakahara, Keita Nozawa, Kazuyoshi Hagiwara, Minoru Shimojo, Rika Shinba, Masami Fujimoto, Tsutomu Onuma
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Patent number: 6077638Abstract: A toner for developing an electrostatic image is formed of toner particles; wherein each toner particle includes (i) 100 wt. parts of a binder resin having a glass transition point (Tg) of 50-70.degree. C., (ii) 0.2-20 wt. parts of solid wax, and (iii) colorant particles or magnetic powder carrying a liquid lubricant, so that the toner particle retains at its surface the liquid lubricant gradually released from the particles (iii). The toner may be further blended with an organically treated inorganic fine powder to provide a developer. The toner or developer retains good lubricity and releasability so that it is suitable to be used in an image forming method including means contacting a latent image-bearing means, such as a contact charging means, a contact transfer means or a contact cleaning means.Type: GrantFiled: March 21, 1997Date of Patent: June 20, 2000Assignee: Canon Kabushiki KaishaInventors: Hirohide Tanikawa, Toshiaki Nakahara, Keita Nozawa, Kazuyoshi Hagiwara, Minoru Shimojo, Rika Shinba, Masami Fujimoto, Tsutomu Onuma
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Patent number: 6060202Abstract: An electrophotographic toner including a blend of toner particles, and external additive particles, is provided with characteristic particle size distribution conditions, i.e., (i) a particle size distribution based on a Coulter counter measurement, including a weight-average particle size D4 of X .mu.m and Y % by number of particles having sizes of 2.00-3.17 .mu.m satisfying:-5X+35.ltoreq.Y.ltoreq.-25X+180 (1)3.5.ltoreq.X.ltoreq.6.5 (2), and(ii) a particle size distribution based on a flow particle image analyzer measurement, including A % by number of particles having circle-equivalent diameters of at least 1.00 .mu.m and below 1.03 .mu.m and B % by number of particles having circle-equivalent diameters of at least 2.00 .mu.m and below 2.06 .mu.m satisfying:B-A.ltoreq.0.30 (3).As a result, the toner is provided with a stable developing performance even in a long period of continuous image formation in a high temperature/high humidity environment.Type: GrantFiled: March 24, 1998Date of Patent: May 9, 2000Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ogawa, Koichi Tomiyama, Keita Nozawa, Shunji Suzuki
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Patent number: 6033817Abstract: A toner for developing an electrostatic image is disclosed which has at least one endothermic peak in the temperature region of 120.degree. C. or below in differential thermal analysis and contains, in its particles having particle diameters of 3 .mu.m or larger, not less than 93% by number of particles having a circularity of at least 0.90 and less than 30% by number of particles having a circularity of at least 0.98. The toner does not cause the re-transfer under high transfer current conditions and can realize the formation of good images with high image density. Also, an image forming method using the toner is disclosed.Type: GrantFiled: July 29, 1997Date of Patent: March 7, 2000Assignee: Canon Kabushiki KaishaInventors: Hiroshi Yusa, Motoo Urawa, Keita Nozawa, Yuki Karaki, Kazuo Maruyama
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Patent number: 5976752Abstract: An electrophotographic toner is composed of at least a binder resin, a colorant, and a wax. The binder resin (a) comprises a polyester resin, a vinyl resin and a hybrid resin component comprising a polyester unit and a vinyl polymer unit, (b) has a THF (tetrahydrofuran)-soluble content (W1) of 50-85 wt. % and a THF-insoluble content (W2) of 5-50 wt. %, an ethyl acetate-soluble content (W3) of 40-98 wt. % and an ethyl acetate-insoluble content (W4) of 2-60 wt. %, a chloroform-soluble content (W5) of 55-90 wt. % and a chloroform-insoluble content (W6) of 10-45 wt. %, respectively after 10 hours of Soxhlet extraction with respective solvents, giving a ratio W4/S6 of 1.1-4.0, and contains a THF-soluble content providing a GPC (gel permeation chromatography) chromatogram exhibiting a main peak in a molecular weight range of 4000-9000, including 35.0-65.0% (A1) of a component haing molecular weights in a range of 500 to below 1.times.10.sup.4, 25.0-45.0% (A2) of a component having molecular weights in a range of 1.Type: GrantFiled: August 18, 1998Date of Patent: November 2, 1999Assignee: Canon Kabushiki KaishaInventors: Satoshi Matsunaga, Koichi Tomiyama, Yuichi Mizoh, Keita Nozawa, Minekazu Endo, Tadashi Doujo, Yoshihiro Ogawa, Nene Shibayama
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Patent number: 5858593Abstract: Disclosed are a magnetic toner for developing an electrostatic latent image comprising magnetic toner particles containing a binder resin of 100 parts by weight and a magnetic substance of 20 to 150 parts by weight, and an apparatus unit and an image forming method for employing the magnetic toner. A frictional electrification property is such that the absolute value of the frictional electrification amount relative to an iron powder of 250 mesh-pass to 350 mesh-on is 25 to 40 mc/kg. Assuming that for particle distribution of the magnetic toner a weight-average particle diameter (D.sub.4) for the magnetic toner is X (.mu.m) and that a count % in a count distribution of magnetic toner particles that have a diameter of 3.17 .mu.m or smaller is Y (%), expressions (1) and (2) are satisfied:-5X+35.ltoreq.Y.ltoreq.-25X+180 (1)3.5.ltoreq.X.ltoreq.6.5 (2).Sphericity (.psi.) of particles is equal to or greater than 0.80 and a product (.sigma..sub.r .times.H.sub.c) of remanence ?.sigma..sub.r (Am.sup.Type: GrantFiled: July 29, 1997Date of Patent: January 12, 1999Assignee: Canon Kabushiki KaishaInventors: Osamu Tamura, Koichi Tomiyama, Nobuyuki Okubo, Shunji Suzuki, Yoshihiro Ogawa, Keita Nozawa
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Patent number: 5840457Abstract: A magnetic black toner for electrophotography, includes: (a) magnetic black toner particles containing a binder resin, a magnetic material in 30-200 wt. parts per 100 wt. parts of the binder resin, and a first solid wax, and (b) first inorganic fine powder. The first solid wax (ii) provides a DSC heat-absorption main peak in a range of 60.degree.-120.degree. C., and (iii) shows a molecular weight distribution factor Mw/Mn of 1.0-2.0. The binder resin (iv) has a THF (tetrahydrofuran)-insoluble content of at most 5 wt. %, and (v) contains a THF-soluble content showing a GPC molecular weight distribution including a content (M1) of 40-70% in molecular weights of below 5.times.10.sup.4, a content (M2.ltoreq.M1) of 20-45% in molecular weights of 5.times.10.sup.4 -5.times.10.sup.5, and a content (M3<M2) of 2-25% in molecular weights exceeding 5.times.10.sup.5. (vi) The magnetic black toner exhibits a tan .delta. of 0.5-3.0 in a range of 150.degree.-190.degree. C. and a tan .delta. at 150.degree. C.Type: GrantFiled: July 30, 1997Date of Patent: November 24, 1998Assignee: Canon Kabushiki KaishaInventors: Motoo Urawa, Keita Nozawa, Hiroshi Yusa, Takashige Kasuya, Yuki Karaki, Kazuo Maruyama, Masao Takano
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Patent number: 5774771Abstract: An image forming method has a developing step of developing an electrostatic latent image by the use of a developer to form a toner image on an electrostatic latent image bearing member, a primary transfer step of transferring the toner image onto an intermediate transfer member to which a voltage is applied, and a secondary transfer step of transferring onto a transfer medium the toner image held on the intermediate transfer member, while a transfer means to which a voltage is applied is pressed against the transfer medium. The developer has a toner. The toner is a black toner having at least i) black toner particles formed of a binder resin with a colorant dispersed therein and ii) an inorganic fine powder. The black toner has the value of shape factor SF-1 of 110<SF-1.ltoreq.180, the value of shape factor SF-2 of 110<SF-2.ltoreq.140, and the value of ratio B/A of 1.Type: GrantFiled: February 9, 1996Date of Patent: June 30, 1998Assignee: Canon Kabushiki KaishaInventors: Tsutomu Kukimoto, Motoo Urawa, Kenji Okado, Toshiyuki Ugai, Keita Nozawa, Satoshi Yoshida, Yuki Karaki
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Patent number: 5712070Abstract: A toner for developing electrostatic images is constituted by toner particles comprising a binder resin and a colorant. The toner is characterized by having (i) a particle size distribution including a weight-average particle size D.sub.4 of X .mu.m and Y% by number of toner particles having a particle size of at most 3.17 .mu.m satisfying the following conditions (1) and (2):-5X+35.ltoreq.Y.ltoreq.-25X+180 (1)3.5.ltoreq.X.ltoreq.6.5 (2),(ii) at least one heat absorption peak in a temperature region of at most 110.degree. C. as measured by differential thermal analysis, and (iii) a tap void of 0.45-0.70. The toner is effective for obviating the sleeve ghost phenomenon.Type: GrantFiled: February 7, 1996Date of Patent: January 27, 1998Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Motoo Urawa, Osamu Tamura, Tsutomu Kukimoto
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Patent number: 5710965Abstract: A developer for developing electrostatic images has a toner and an aggregate of fine particles. The aggregate holds a silicone compound selected from the group consisting of a silicone oil and a silicone varnish, in an amount of from 20% by weight to 90% by weight.Type: GrantFiled: August 15, 1995Date of Patent: January 20, 1998Assignee: Canon Kabushiki KaishaInventors: Keita Nozawa, Tsutomu Kukimoto, Satoshi Matsunaga, Kazuyoshi Hagiwara