Patents by Inventor Hayato Shimizu
Hayato Shimizu 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).
-
Patent number: 7643245Abstract: A magnetic disc unit includes a rotating disc type magnetic disc, a head for recording and reproducing data to and from the magnetic disc, and a head support mechanism for supporting the head. The magnetic disc unit includes a shroud surrounding an outer periphery of the magnetic disc other than at least at an inserting part of a carriage arm which is linked to the magnetic head support mechanism. A gap between an end face of the outer periphery of the magnetic disc and the shroud is set in a range not less than 0.1 mm but not greater than 0.4 mm.Type: GrantFiled: December 21, 2007Date of Patent: January 5, 2010Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Publication number: 20080106819Abstract: A magnetic disc unit includes a rotating disc type magnetic disc, a head for recording and reproducing data to and from the magnetic disc, and a head support mechanism for supporting the head. The magnetic disc unit includes a shroud surrounding an outer periphery of the magnetic disc other than at least at an inserting part of a carriage arm which is linked to the magnetic head support mechanism. A gap between an end face of the outer periphery of the magnetic disc and the shroud is set in a range not less than 0.1 mm but not greater than 0.4 mm.Type: ApplicationFiled: December 21, 2007Publication date: May 8, 2008Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 7336440Abstract: A magnetic disc unit includes a rotating disc type magnetic disc having an outer periphery, and a carriage arm linked to a head support mechanism for a recording/reproducing head. A base has an outer periphery and mounts the rotating disc type magnetic disc and the carriage arm, and has a side wall with an inner wall surface having an opening for inserting the carriage arm. The inner wall surface of the side wall defines a shroud surrounding the outer periphery of the magnetic disc, except at the opening in the side wall where the shroud is projected inwardly so as to decrease an opening angle of the opening in the side wall. A gap between the outer periphery of the magnetic disc and the shroud is set in a range not less than 0.1 mm but not greater than 0.6 mm.Type: GrantFiled: March 24, 2006Date of Patent: February 26, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 7330334Abstract: A magnetic disk apparatus includes a plurality of magnetic disks driven to rotate by a spindle motor, arms supporting magnetic heads on the magnetic disks, an actuator for moving the arms on the magnetic disks by a voice coil motor, and a housing which surrounds the magnetic disks, the arms and the actuator. A shroud which arcuately surrounds the magnetic disks along the outer periphery thereof has an opened portion for inserting the arms is formed in a part of the housing. The shroud on an upstream side of the arms relative to airflow generated by the magnetic disks when rotating is provided with an opening having a greater width than that of a gap defined between the shroud and the outer periphery of the magnetic disks. An empty bypass channel is provided which communicates from the opening through a rear side of the voice coil motor to the downstream side of the arms.Type: GrantFiled: May 16, 2005Date of Patent: February 12, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Publication number: 20080014082Abstract: The object of the present invention is to provide a pump structure that can reduce a hydraulic force applied to a casing of a multi stage diffuser pump, which includes multiple stages of impellers fixed to a rotary shaft rotatably supported in the casing and multiple stages of guide vane diffusers and return blade passages fixed on the casing in correspondence with the multiple stages of impellers, thereby reducing the vibrations and noises of the pump. In a multi stage diffuser pump of the type which includes multiple stages of impellers fixed to the rotary shaft and multiple stages of guide vane diffusers and return blade passages fixed on circular disks in the casing in correspondence with the multiple stages of impellers, in the impellers of the two stages of front and rear stages, which are equivalent in the form and number of blades, the phases of positions in the peripheral direction of the blades of the impellers of at least one pair of front and rear stages are deviated from each other by 0.Type: ApplicationFiled: July 9, 2007Publication date: January 17, 2008Inventors: Katsutoshi Kobayashi, Hayato Shimizu, Tetsuya Yoshida, Yoshimasa Chiba
-
Publication number: 20060164754Abstract: A magnetic disc unit includes a rotating disc type magnetic disc having an outer periphery, and a carriage arm linked to a head support mechanism for a recording/reproducing head. A base has an outer periphery and mounts the rotating disc type magnetic disc and the carriage arm, and has a side wall with an inner wall surface having an opening for inserting the carriage arm. The inner wall surface of the side wall defines a shroud surrounding the outer periphery of the magnetic disc, except at the opening in the side wall where the shroud is projected inwardly so as to decrease an opening angle of the opening in the side wall. A gap between the outer periphery of the magnetic disc and the shroud is set in a range not less than 0.1 mm but not greater than 0.6 mm.Type: ApplicationFiled: March 24, 2006Publication date: July 27, 2006Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 7072141Abstract: A magnetic disc unit having a rotating disc type magnetic disc, a head for recording and reproducing data to and from the magnetic disc, and a shroud surrounding an end surface of an outer periphery of the magnetic disc, except a part where a carriage arm is inserted, wherein a gap between the outer peripheral end surface of the magnetic disc and the shroud is set in a range which is greater than 0.1 mm but not greater than 0.6 mm.Type: GrantFiled: October 8, 2003Date of Patent: July 4, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Publication number: 20050219741Abstract: A magnetic disk apparatus includes a plurality of magnetic disks driven to rotate by a spindle motor, arms supporting magnetic heads on the magnetic disks, an actuator for moving the arms on the magnetic disks by a voice coil motor, and a housing which surrounds the magnetic disks, the arms and the actuator. A shroud which arcuately surrounds the magnetic disks along the outer periphery thereof has an opened portion for inserting the arms is formed in a part of the housing. The shroud on an upstream side of the arms relative to airflow generated by the magnetic disks when rotating is provided with an opening having a greater width than that of a gap defined between the shroud and the outer periphery of the magnetic disks. An empty bypass channel is provided which communicates from the opening through a rear side of the voice coil motor to the downstream side of the arms.Type: ApplicationFiled: May 16, 2005Publication date: October 6, 2005Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 6898049Abstract: A magnetic disk apparatus includes magnetic disks stacked on a rotating shaft, arms supporting magnetic heads, a rotary actuator for moving the arms, and a housing forming at least a part of an arcuate-shaped shroud which substantially surrounds a portion of side surfaces of the magnetic disks so as to define a gap between the shroud and the portion of the side surfaces of the magnetic disks. The arcuate-shaped shroud has portions delimiting an open space adjacent to another portion of the side surfaces of the magnetic disks which is located on a downstream side of the arms relative to an air flow which moves on surfaces of the magnetic disks. A bypass channel provides air flow to the disks in a region of the open space at a reduced pressure on the downstream side of the arms with respect to pressure at an upstream side of the arms.Type: GrantFiled: April 9, 2003Date of Patent: May 24, 2005Assignee: Hitachi, Ltd.Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 6751050Abstract: A magnetic disc unit which can restrain occurrence of flutter so as to countermeasure such a problem that the larger the rotational speed of discs, the higher the flutter, causing heat positioning errors, in order that the high rotational speed and high positioning accuracy are consistent with each other. Discs are surrounded along their outer peripheries by a shroud (outer wall) while a gap between end faces of the discs and the shroud is decreased to a predetermined distance, thereby to eliminate air pressure differential between opposite surfaces of each of the discs in order to reduce flutter.Type: GrantFiled: February 10, 1999Date of Patent: June 15, 2004Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 6724577Abstract: The structure is made such that an aerodynamic latch is provided in an outer portion of a magnetic disc, a front end portion exposed to a wind in the aerodynamic latch is formed to be shorter than an outer peripheral surface of the magnetic disc, and the wind receiving portion of the aerodynamic latch moves an air stream outlet from an end surface of the magnetic disc and a shroud in a direction of forming a flow passage for passing through a portion apart from the magnetic disc. Accordingly, a stable aerodynamic latch drive can be achieved and an air stream within the disc is not disturbed, so that it is possible to reduce a flutter and a consumed electric power.Type: GrantFiled: February 23, 2001Date of Patent: April 20, 2004Assignee: Hitachi, Ltd.Inventors: Eiji Ishii, Takashi Kouno, Hayato Shimizu
-
Publication number: 20040070866Abstract: A magnetic disc unit having a rotating disc type magnetic disc, a head for recording and reproducing data to and from the magnetic disc, and a shroud surrounding an end surface of an outer periphery of the magnetic disc, except a part where a carriage arm is inserted, wherein a gap between the outer peripheral end surface of the magnetic disc and the shroud is set in a range which is greater than 0.1 mm but not greater than 0.6 mm.Type: ApplicationFiled: October 8, 2003Publication date: April 15, 2004Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 6665139Abstract: In a magnetic disc apparatus including a plurality of magnetic discs mounted on a spindle, arms supporting magnetic heads, a rotary actuator for the arms, and a housing having an arcuate-shaped shroud, the improvement wherein gaps between the shroud and the sides of outer peripheries of the magnetic discs are larger than 0.1 mm and less than 0.6 mm. An open space is located, downstream of the arms with respect to the air flow on surfaces of the magnetic discs, the open space being devoid of the shroud. An opening is provided in the shroud, upstream of the arms with respect to the air flow and having a greater width than a width of the gaps defined between the magnetic discs and the shroud, and a bypass channel is provided which communicates between the opening and open space.Type: GrantFiled: December 20, 2001Date of Patent: December 16, 2003Assignee: Hitachi, Ltd.Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari
-
Publication number: 20030189785Abstract: A magnetic disk apparatus includes magnetic disks stacked on a rotating shaft, arms supporting magnetic heads, a rotary actuator for moving the arms, and a housing forming at least a part of an arcuate-shaped shroud which substantially surrounds a portion of side surfaces of the magnetic disks so as to define a gap between the shroud and the portion of the side surfaces of the magnetic disks. The arcuate-shaped shroud has portions delimiting an open space adjacent to another portion of the side surfaces of the magnetic disks which is located on a downstream side of the arms relative to an air flow which moves on surfaces of the magnetic disks. A bypass channel provides air flow to the disks in a region of the open space at a reduced pressure on the downstream side of the arms with respect to pressure at an upstream side of the arms.Type: ApplicationFiled: April 9, 2003Publication date: October 9, 2003Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Patent number: 6618225Abstract: A magnetic head supporting apparatus having a magnetic head for reading and writing information on a magnetic disc, a slider for mounting the magnetic head, and a suspension for supporting the slider. An IC chip for controlling a signal of the magnetic head is mounted on a heat insulating substrate which substantially prevents conduction of heat therethough, and the heat insulating substrate is mounted to the suspension.Type: GrantFiled: November 6, 2002Date of Patent: September 9, 2003Assignee: Hitachi Ltd.Inventors: Hayato Shimizu, Norio Nakazato, Masaaki Matsumoto, Yoshihiro Shiroishi, Mikio Tokuyama, Toshihiko Shimizu, Shigeo Nakamura
-
Patent number: 6600626Abstract: A magnetic disk apparatus arranged in a housing having a plurality of magnetic disks stacked on a rotating shaft, arms supporting thereon magnetic heads and adapted to be inserted between said magnetic disks, a rotary actuator for moving the arms, a housing forming at least a part of an arcuate-shaped shroud which substantially surrounds a portion of side surfaces of the magnetic disks so as to permit movement of the arms and which is concentric with the magnetic disks so as to define a gap between the shroud and the portion of the side surfaces of said magnetic disks. The gap defined between the outer peripheral end surfaces of the magnetic disks and the shroud is in a range of 0.1 mm to 0.6 mm.Type: GrantFiled: March 22, 2002Date of Patent: July 29, 2003Assignee: Hitachi, Ltd.Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Publication number: 20030053255Abstract: A magnetic head supporting apparatus having a magnetic head for reading and writing information on a magnetic disc, a slider for mounting said magnetic head, and a suspension for supporting the slider. An IC chip for controlling a signal of the magnetic head is mounted on a heat insulating substrate, and the heat insulating substrate is mounted to the suspension.Type: ApplicationFiled: November 6, 2002Publication date: March 20, 2003Inventors: Hayato Shimizu, Norio Nakazato, Masaaki Matsumoto, Yoshihiro Shiroishi, Mikio Tokuyama, Toshihiko Shimizu, Shigeo Nakamura
-
Patent number: 6498702Abstract: A magnetic head supporting apparatus includes a magnetic head for reading and writing information on a magnetic disc, a slider having the magnetic head, and a suspension for supporting the slider. An IC chip for controlling a signal of the magnetic head is mounted on a first surface of a heat insulating substrate, and a second surface of the heat insulating substrate opposite to the first surface thereof is mounted to the suspension.Type: GrantFiled: February 22, 2000Date of Patent: December 24, 2002Assignee: Hitachi, Ltd.Inventors: Hayato Shimizu, Norio Nakazato, Masaaki Matsumoto, Yoshihiro Shiroishi, Mikio Tokuyama, Toshihiko Shimizu, Shigeo Nakamura
-
Publication number: 20020181149Abstract: A magnetic disk apparatus arranged in a housing having a plurality of magnetic disks stacked on a rotating shaft, arms supporting thereon magnetic heads and adapted to be inserted between said magnetic disks, a rotary actuator for moving the arms, a housing forming at least a part of an arcuate-shaped shroud which substantially surrounds a portion of side surfaces of the magnetic disks so as to permit movement of the arms and which is concentric with the magnetic disks so as to define a gap between the shroud and the portion of the side surfaces of said magnetic disks. The gap defined between the outer peripheral end surfaces of the magnetic disks and the shroud is in a range of 0.1 mm to 0.6 mm.Type: ApplicationFiled: March 22, 2002Publication date: December 5, 2002Inventors: Hayato Shimizu, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari, Mikio Tokuyama, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi
-
Publication number: 20020075592Abstract: In a magnetic disk apparatus including a plurality of magnetic disks mounted on a spindle, arms supporting magnetic heads, a rotary actuator for the arms, and a housing having an arcuate-shaped shroud, the improvement wherein gaps between the shroud and the sides of outer peripheries of the magnetic disks are larger than 0.1 mm and less than 0.6 mm. An open space is located, downstream of the arms, with respect to an air flow on surfaces of the magnetic disks, the open space being devoid of the shroud. An opening is provided in the shroud, upstream of the arms with respect to the air flow and having a greater width than a width of the gaps defined between the magnetic disks and the shroud, and a bypass channel is provided which communicates between the opening and the open space.Type: ApplicationFiled: December 20, 2001Publication date: June 20, 2002Inventors: Mikio Tokuyama, Hayato Shimizu, Satomitsu Imai, Shozo Saegusa, Masahiko Sega, Toshihisa Okazaki, Yuzo Yamaguchi, Masao Iwakura, Shigeo Nakamura, Kazuo Sakai, Shigenori Togashi, Masayuki Kaiho, Toshiaki Kobari