Patents by Inventor Takao Mizutani
Takao Mizutani 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: 7872805Abstract: A lenticular lens medium forms a lenticular lens which includes a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014 ?·cm and a surface resistivity of 1×108-1×1015?/?.Type: GrantFiled: March 11, 2009Date of Patent: January 18, 2011Assignees: Oki Data Corporation, Kureha CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Patent number: 7852563Abstract: A lenticular lens medium forms a lenticular lens which comprises a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014?·cm and a surface resistivity of 1×108-1×1015?/?. The lenticular lens medium including the convex parts has a thickness of 0.3-3 mm.Type: GrantFiled: March 12, 2009Date of Patent: December 14, 2010Assignee: Oki Data CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Publication number: 20090231716Abstract: A lenticular lens medium forms a lenticular lens which comprises a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014 ?·cm and a surface resistivity of 1×108-1×1015 ?/?. The lenticular lens medium including the convex parts has a thickness of 0.3-3 mm.Type: ApplicationFiled: March 12, 2009Publication date: September 17, 2009Applicant: OKI DATA CORPORATIONInventors: Takao MIZUTANI, Hirokazu ANDO, Takehiko OKAJIMA, Kazuhiko NAGAOKA, Nobuo WAKASUGI
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Publication number: 20090231717Abstract: A lenticular lens medium forms a lenticular lens which includes a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014?·cm and a surface resistivity of 1×108-1×1015?/?.Type: ApplicationFiled: March 11, 2009Publication date: September 17, 2009Applicants: Oki Data Corporation, Kureha CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Patent number: 7058344Abstract: A developing apparatus supplies a developer from a developing roller to an image-bearing body that bears an electrostatic latent image thereon. A toner-supplying roller is rotatably supported to oppose the developing roller. A rotating body has recesses formed in its surface, opposing the developer-bearing member. The toner-supplying roller and the rotating body rotate in opposite directions and at different circumferential speeds. The rotating body is formed of a foamed material having cells formed in and open to a surface of the rotating body, the cells having a cell size in the range of 10 to 40 cells/inch. The toner-supplying roller and the rotating body rotate at circumferential speeds such that a ratio between the circumferential speeds is in the range of 1 to 2.5. The rotating body and toner-supplying roller may have a diameter that varies along the length.Type: GrantFiled: July 7, 2004Date of Patent: June 6, 2006Assignee: Oki Data CorporationInventors: Takao Mizutani, Akihito Onishi, Tetsuya Segawa
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Patent number: 6979971Abstract: An operation command for constructing compensation data is generated in a control device, and measurement data obtained from an external length measuring device is input to an input unit. The measurement data is compared with an estimated position in a control device of a cylinder servo motor, and errors between them is stored in a compensation memory. In addition, in normal operation, the external length measuring device is removed. A movement command is input to the input unit and compensated using the error stored in the compensation memory, so that the estimated error is deleted in the normal operation.Type: GrantFiled: April 26, 2001Date of Patent: December 27, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kouichi Takamune, Hidenobu Itou, Takao Mizutani
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Patent number: 6975823Abstract: An image forming apparatus includes an image carrier rotatable in a predetermined rotative direction, a charging unit for charging a surface of the image carrier, a precharging device disposed upstream from the charging unit with respect to the predetermined rotative direction of the image carrier for precharging the surface of the image carrier; and a voltage supply unit for supplying a voltage to the precharging device.Type: GrantFiled: August 26, 2003Date of Patent: December 13, 2005Assignee: Oki Data CorporationInventors: Akihito Onishi, Takao Mizutani, Masayuki Suzuki
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Publication number: 20050008402Abstract: A developing apparatus supplies a developer from a developing roller to an image-bearing body that bears an electrostatic latent image thereon. A toner-supplying roller is rotatably supported to oppose the developing roller. A rotating body has recesses formed in its surface, opposing the developer-bearing member. The toner-supplying roller and the rotating body rotate in opposite directions and at different circumferential speeds. The rotating body is formed of a foamed material having cells formed in and open to a surface of the rotating body, the cells having a cell size in the range of 10 to 40 cells/inch. The toner-supplying roller and the rotating body rotate at circumferential speeds such that a ratio between the circumferential speeds is in the range of 1 to 2.5. The rotating body and toner-supplying roller may have a diameter that varies along the length.Type: ApplicationFiled: July 7, 2004Publication date: January 13, 2005Inventors: Takao Mizutani, Akihito Onishi, Tetsuya Segawa
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Publication number: 20040042821Abstract: An image forming apparatus of the invention includes an image carrier rotatable in a predetermined rotative direction, a charging unit for charging a surface of the image carrier, a precharging device disposed upstream from the charging unit with respect to the predetermined rotative direction of the image carrier for precharging the surface of the image carrier; and a voltage supply unit for supplying a voltage to the precharging device.Type: ApplicationFiled: August 26, 2003Publication date: March 4, 2004Inventors: Akihito Onishi, Takao Mizutani, Masayuki Suzuki
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Patent number: 6700231Abstract: A thrust converter includes reciprocation movement means 1; reciprocation-rotation conversion means 2 for converting reciprocating movement of the reciprocation movement means into rotational movement; rotation-reciprocation conversion means 7 for converting rotational movement of the reciprocation-rotation conversion means; and reaction-force receiving means 11 for supporting reaction force stemming from reciprocation movement of the rotation-reciprocation conversion means. Thrust imparted to the reciprocation movement means can be imparted to a load while being amplified or reduced, through employment of a compact and simple construction.Type: GrantFiled: December 31, 2001Date of Patent: March 2, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kouichi Takamune, Seiichi Mimura, Hidenobu Ito, Yoshiyuki Hatsutori, Yoshio Kasuga, Takao Mizutani
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Publication number: 20030184252Abstract: An operation command for constructing compensation data is generated in a control device, and measurement data obtained from an external length measuring device is input to an input unit. The measurement data is compared with an estimated position in a control device of a cylinder servo motor, and errors between them is stored in a compensation memory. In addition, in normal operation, the external length measuring device is removed. A movement command is input to the input unit and compensated using the error stored in the compensation memory, so that the estimated error is deleted in the normal operation.Type: ApplicationFiled: May 19, 2003Publication date: October 2, 2003Inventors: Kouichi Takamune, Hidenobu Itou, Takao Mizutani
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Patent number: 6570282Abstract: A cylinder servo motor includes a servo motor having a rotor and a stator; a cylinder servo main unit which is connected to a rotary shaft of the rotor of the servo motor by way of a ball screw nut and which has a ball screw shaft, the ball screw shaft moving in an axial direction; a rotation sensor for detecting a rotary position of the servo motor; and control means for controlling the rotation sensor and the servo motor. The cylinder servo motor main unit, the rotation sensor, and the control means are integrated together, thereby providing a cylinder servo motor which obviates a necessity of wiring a line between the servo motor, the rotation sensor, and the control device section at a location to which the cylinder servo motor is to be shipped.Type: GrantFiled: January 28, 2002Date of Patent: May 27, 2003Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hidenobu Ito, Kouichi Takamune, Takao Mizutani
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Patent number: 6539183Abstract: An image-forming apparatus includes a developing roller and a developing blade. The developing blade applies toner to the developing roller to form a thin layer of toner on the developing roller. The image-forming apparatus performs a printing operation that includes a paper-feeding period and a developing period following the paper-feeding period. The developing roller rotates relative to the developing blade at a first speed during the paper-feeding period and then at a lower second speed than during the developing period, thereby eliminating chance of white lines of occurring in a printed image. The developing roller may be rotated at a constant speed in each printing operation until the circumferential surface of the developing roller has traveled over a certain cumulative distance. When the surface has traveled over the first distance, the developing roller may be rotated at an increased speed over a certain distance.Type: GrantFiled: October 16, 2001Date of Patent: March 25, 2003Assignee: Oki Data CorporationInventors: Hideaki Ishimizu, Noboru Ooishi, Takao Uchida, Takao Mizutani
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Publication number: 20020162409Abstract: To obtain a thrust converter constituted by a reciprocating means 1, a reciprocation-to-rotation converting means 5 for converting a reciprocating motion of the reciprocating means 1 into a rotary motion, a rotation-to-reciprocation converting means 11 located on the same axial line as that of the reciprocation-to-rotation converting means 5 for converting the rotary motion of the reciprocation-to-rotation converting means 5 into a reciprocating motion, a reaction force receiving means 15 for receiving reaction force against the reciprocating motion of the rotation-to-reciprocation converting means 11, and a moving means 92 for moving the reciprocation-to-rotation converting means 5 and the rotation-to-reciprocation converting means 11 in an axial direction separately from driving force due to the reciprocating motion of the reciprocating means 1. Accordingly, the length for the trust converting quantity can be shortened in proportion to the ratio of the stroke.Type: ApplicationFiled: February 12, 2002Publication date: November 7, 2002Inventors: Hidenobu Ito, Seiichi Mimura, Kouichi Takamune, Takao Mizutani
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Publication number: 20020158520Abstract: A thrust converter includes reciprocation movement means 1; reciprocation-rotation conversion means 2 for converting reciprocating movement of the reciprocation movement means into rotational movement; rotation-reciprocation conversion means 7 for converting rotational movement of the reciprocation-rotation conversion means; and reaction-force receiving means 11 for supporting reaction force stemming from reciprocation movement of the rotation-reciprocation conversion means. Thrust imparted to the reciprocation movement means can be imparted to a load while being amplified or reduced, through employment of a compact and simple construction.Type: ApplicationFiled: December 31, 2001Publication date: October 31, 2002Inventors: Kouichi Takamune, Seiichi Mimura, Hidenobu Ito, Yoshiyuki Hatsutori, Yoshio Kasuga, Takao Mizutani
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Publication number: 20020076226Abstract: An image-forming apparatus includes a developing roller and a developing blade. The developing blade applies toner to the developing roller to form a thin layer of toner on the developing roller. The image-forming apparatus performs a printing operation that includes a paper-feeding period and a developing period following the paper-feeding period. The developing roller rotates relative to the developing blade at a first speed during the paper-feeding period and then at a lower second speed than during the developing period, thereby eliminating chance of white lines of occurring in a printed image. The developing roller may be rotated at a constant speed in each printing operation until the circumferential surface of the developing roller has traveled over a certain cumulative distance. When the surface has traveled over the first distance, the developing roller may be rotated at an increased speed over a certain distance.Type: ApplicationFiled: October 11, 2001Publication date: June 20, 2002Inventors: Hideaki Ishimizu, Noboru Ooishi, Takao Uchida, Takao Mizutani
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Patent number: 6179761Abstract: A semiconductive roller has an electrically conductive shaft, a roller provided on the shaft formed of silicone rubber with carbon contained therein. The silicone rubber is also added olefin oil and zinc oxide. A method is used for manufacturing a semiconductive roller formed of an electrically conductive shaft. The method includes carrying out a first vulcanization where the semiconductive roller is shaped into a roller and carrying out a second vulcanization where the semiconductive roller is heated at 200° C. for substantially four hours.Type: GrantFiled: November 1, 1999Date of Patent: January 30, 2001Assignee: Oki Data CorporationInventors: Masao Isoda, Hirokazu Ando, Takao Mizutani, Masayuki Suzuki
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Patent number: 6118970Abstract: A cleaning roller is used for electrostatically attracting residual toner left on a photoconductive drum. The cleaning roller includes a shaft and a member formed on the shaft to cover the shaft. The member has contact portions that lie in a cylindrical plane and a plurality of recesses that are formed in the member and bounded by the contact portions. The contact portions are in contact with the photoconductive drum to attract residual toner left on the photoconductive drum. The recesses hold therein the residual toner attracted to the contact portions. The recesses have openings that lie in the cylindrical plane such that a ratio of the areas of the contact portions to the areas of the openings is in the range from 3:7 to 1:1. The openings of the recesses have effective diameters in the range from 50 to 150 .mu.m if the toner particles have effective diameters in the range from 6 to 9 .mu.m. The cleaning roller includes a metal shaft and a resilient member formed on the metal shaft to cover the metal shaft.Type: GrantFiled: June 3, 1999Date of Patent: September 12, 2000Assignee: Oki Data CorporationInventors: Masayuki Suzuki, Hirokazu Ando, Takao Mizutani, Masao Isoda
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Patent number: 6081679Abstract: A method for cleaning an image-forming apparatus. Toner is charged to the first polarity prior to transferring the toner image to the print medium and accidentally inverted from the first polarity to a second polarity opposite to the first polarity during the transfer of the toner image to the print medium. When performing a cleaning operation, a first voltage of a first polarity is applied to at least one of a charging roller and a cleaning roller in contact with a surface of a photoconductor. The surface of the photoconductor is charged to a second voltage. The second voltage has a smaller value than the first voltage and is of the same polarity as the first voltage. Therefore, the toner of the second polarity sandwiched between the charged surface of the photoconductor and the at least one of the charging roller and cleaning roller is inverted in polarity, i.e., from the second polarity to the first polarity by triboelectric charging.Type: GrantFiled: September 15, 1999Date of Patent: June 27, 2000Assignee: Oki Data CorporationInventors: Tsutomu Yamane, Akihito Onishi, Hirokazu Ando, Takao Mizutani, Masao Isoda
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Patent number: 5975993Abstract: A method of manufacturing a developing roller includes two steps. First, a grinding wheel is moved along the length of a developing roller which has been subjected to a secondary vulcanization. The grinding wheel is brought into contact with the developing roller and is caused to rotate so as to perform an abrasive finishing on the surface of the developing roller. Second, a buffing member is moved along the length of the developing roller. The buffing member is in contact with the developing roller and is moved in the peripheral direction of the developing roller so as to perform buffing on the surface of the developing roller.Type: GrantFiled: August 15, 1997Date of Patent: November 2, 1999Assignee: Oki Data CorporationInventors: Masao Isoda, Hirokazu Ando, Takao Mizutani, Tutomu Shimoda