Patents by Inventor Masakazu Sasaki
Masakazu Sasaki 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: 11964317Abstract: A heat pipe structure includes a base block including a rear surface part thermally connectable to a heat generating body and a heat pipe fixed to a front surface part of the base block and including a heat receiving tubular portion disposed along an in-plane direction of the base block. The base block has a longitudinal direction and a width direction and includes a recessed part in which the heat receiving tubular portion is housed and a pair of wall parts projecting along an outer circumferential surface of the heat receiving tubular portion from width direction both sides of the recessed part, and a container of the heat pipe is caulked and fixed by the recessed part and the pair of wall parts and includes a projecting shape part projecting in a direction opposite to a direction of the caulking between distal end portions of the pair of wall parts.Type: GrantFiled: December 22, 2020Date of Patent: April 23, 2024Assignee: Furukawa Electric Co., Ltd.Inventors: Chiyoshi Sasaki, Masakazu Isemura, Takahiro Katayama
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Publication number: 20240076425Abstract: To provide a 4-methyl-1-pentene polymer being excellent in storage stability when dissolved in a solvent and solubility, and being excellent in at least one of heat resistance, and a coating appearance when a coating film is stretched, for example, when such a film is bended or used in a flexible application. A 4-methyl-1-pentene polymer (A) being a copolymer of 4-methyl-1-pentene and at least one selected from linear ?-olefins having 6 to 20 carbon atoms, the 4-methyl-1-pentene polymer (A) satisfying the following requirements (I) and (II): (I) an endotherm end temperature (TmE) in a melting (endothermic) curve measured by DSC is 230° C. or lower; and (II) an exotherm start temperature (TcS) in a crystallization (exothermic) curve measured by DSC is 210° C. or lower.Type: ApplicationFiled: February 24, 2022Publication date: March 7, 2024Applicant: MITSUI CHEMICALS, INC.Inventors: Akihiro ASANO, Masakazu TANAKA, Toyoaki SASAKI, Yusuke MIZOBUCHI, Takuya IWATA
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Patent number: 9343101Abstract: A hard disk drive is described, including a low-profile disk clamp to tied-shaft spindle/spindle motor assembly, in which a clamping nut is threaded onto a threaded spindle sleeve and a stationary shaft screw, or tied-shaft, penetrates through the HDD cover and into a shaft. The disk clamp may include a central opening for centering about the sleeve by way of the outer diameter of the clamping nut mating with the outer diameter of the clamp opening.Type: GrantFiled: June 19, 2014Date of Patent: May 17, 2016Assignee: HGST Netherlands B.V.Inventors: Takao Suzuki, Masakazu Sasaki, Eriko Iwase, Yasuhiro Sakata
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Publication number: 20150371675Abstract: A hard disk drive is described, including a low-profile disk clamp to tied-shaft spindle/spindle motor assembly, in which a clamping nut is threaded onto a threaded spindle sleeve and a stationary shaft screw, or tied-shaft, penetrates through the HDD cover and into a shaft. The disk clamp may include a central opening for centering about the sleeve by way of the outer diameter of the clamping nut mating with the outer diameter of the clamp opening.Type: ApplicationFiled: June 19, 2014Publication date: December 24, 2015Inventors: Takao Suzuki, Masakazu Sasaki, Eriko Iwase, Yasuhiro Sakata
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Patent number: 8493690Abstract: A load-unload ramp structure with a cantilevered fin portion to reduce drop shock in a hard-disk drive (HDD). The load-unload ramp structure includes a first load-unload ramp, a fin, and a bracket portion. The first load-unload ramp is configured to lift a first head-slider away from a magnetic-recording disk. The fin is coupled to the first load-unload ramp and is disposed below a first parking position of the first head-slider. The fin includes a fin base portion and a first cantilevered fin portion. The first cantilevered fin portion is coupled to, and extends outward from, the fin base portion. The bracket portion is integrally attached to the first load-unload ramp, and is configured to allow affixing the load-unload ramp structure in a static position in a disk-enclosure base of the HDD. A HDD including the load-unload ramp structure and a method for providing protection from drop shock are also provided.Type: GrantFiled: December 29, 2011Date of Patent: July 23, 2013Assignee: HGST Netherlands B.V.Inventors: Makoto Ono, Masakazu Sasaki
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Publication number: 20130170069Abstract: A load-unload ramp structure with a cantilevered fin portion to reduce drop shock in a hard-disk drive (HDD). The load-unload ramp structure includes a first load-unload ramp, a fin, and a bracket portion. The first load-unload ramp is configured to lift a first head-slider away from a magnetic-recording disk. The fin is coupled to the first load-unload ramp and is disposed below a first parking position of the first head-slider. The fin includes a fin base portion and a first cantilevered fin portion. The first cantilevered fin portion is coupled to, and extends outward from, the fin base portion. The bracket portion is integrally attached to the first load-unload ramp, and is configured to allow affixing the load-unload ramp structure in a static position in a disk-enclosure base of the HDD. A HDD including the load-unload ramp structure and a method for providing protection from drop shock are also provided.Type: ApplicationFiled: December 29, 2011Publication date: July 4, 2013Inventors: Makoto Ono, Masakazu Sasaki
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Patent number: 8467152Abstract: Embodiments of the present invention provide an inexpensive latching mechanism having a necessary and sufficient function to hold an actuator of a magnetic disk drive and including a latch formed in a one-piece structure. According to one embodiment, a latching mechanism for a magnetic disk drive includes a latch lever, a hook, for latching an actuator, extending vertically downward from the latch lever, and a bar, to be pressed by an actuator at its home position in a closing direction, extending vertically downward from the latch arm. A steel pin is attached to the latch lever to urge the latch in an opening direction by a magnetic force.Type: GrantFiled: September 24, 2008Date of Patent: June 18, 2013Assignee: HGST Netherlands B.V.Inventors: Takeshi Chawanya, Mutsuro Ohta, Masakazu Sasaki
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Patent number: 8289657Abstract: Embodiments of the present invention help provide a simple and inexpensive actuator mechanism for a magnetic disk drive. The actuator mechanism includes an approximately circular coil and a simple shaped magnet, and is capable of displaying adequate performance required for the magnetic disk drive. According to one embodiment, the magnetic disk drive includes an actuator mechanism which has an approximately circular coil and an approximately rectangular magnet. The long axis direction of the rectangular magnet is oriented in parallel to a straight line connecting the center of the inner circle of the circular coil in a state in which the actuator is positioned at the outermost circumference of a data area and the center of the inner circle of the circular coil in a state in which the actuator is positioned at the innermost circumference of the data area.Type: GrantFiled: September 25, 2008Date of Patent: October 16, 2012Assignee: Hitachi Global Storage Technologies, Netherlands B.V.Inventors: Mutsuro Ohta, Masakazu Sasaki, Takeshi Chawanya, Kenji Suzuki
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Patent number: 7929254Abstract: Embodiments of the present invention help to suppress performance degradation in an actuator of a disk drive device when attaching a damping member to a single surface of an arm. According to one embodiment, in a HDD a damping member is attached to a single surface of an arm. A shape of an inner arm is asymmetric with the center position between disks. Specifically, the thickness from a center position between the disks to the damping material attaching surface is thinner than the thickness from a center position between the disks to an opposite surface of the damping member attaching surface. This suppresses deformation of the vibration mode in the case that the damping member is attached to the single surface of the arm.Type: GrantFiled: November 30, 2007Date of Patent: April 19, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Eiji Soga, Masakazu Sasaki, Hajime Eguchi, Hiromitsu Masuda
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Patent number: 7855857Abstract: Embodiments of the present invention restrain the head position accuracy from degrading due to torsional vibration of a head supporting unit. According to an embodiment of the invention, an actuator has a twisted carriage arm. A suspension is tilted in accordance with the twist of the carriage arm. When the carriage arm and the suspension torsionally vibrate, the vibration direction tilts against the normal direction of a recording surface in accordance with the twist. This technique decreases a peak value of off-track displacement that is caused by a head slider and is dependent on relationship between a skew angle and a torsional vibration direction.Type: GrantFiled: June 26, 2007Date of Patent: December 21, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satoshi Hayakawa, Takeshi Chawanya, Masakazu Sasaki, Kenji Suzuki
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Publication number: 20100259210Abstract: A charge/discharge of a capacitor system (10) with stacked electric double layer capacitors is regulated by an inverter/converter (9) for stabilizing an output power of a wind power generator (1). The inverter/converter controller (53) controls the inverter/converter (9) such that, when the state of charge (SOC) of the capacitor system (10) exceeds an upper threshold (H1), which is smaller than an upper limit (H2), the charged power of the capacitor system (10) gradually decreases according to an excess amount. The inverter/converter controller (53) also controls the inverter/converter (9) such that, when the state of charge (SOC) is below a lower threshold (L1) which is higher than a lower limit (L2), the discharged power of the capacitor system (10) gradually decreases according to a short amount, thereby preventing overcharging and overdischarging of the capacitor system (10).Type: ApplicationFiled: October 20, 2005Publication date: October 14, 2010Applicant: Nissan Diesel Motor Co., Ltd.Inventors: Masakazu Sasaki, Tetsuo Saitou
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Patent number: 7660077Abstract: In an embodiment of the present invention, at least one mechanical fastener is used to mount a voice coil magnet assembly of a hard disk drive on a housing of the hard disk drive. A layer of a material having a low friction coefficient is disposed between the housing and the voice coil magnet assembly.Type: GrantFiled: January 10, 2006Date of Patent: February 9, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Steven Hanssen, Masaki Kohno, Masakazu Sasaki, Jr-Yi Shen
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Patent number: 7616397Abstract: Embodiments in accordance with the present invention improve the head characteristic and avoid collisions between a head element section and a recording disk. A hard disk drive according to an embodiment of the present invention performs TFC (Thermal Fly height Control) to adjust the clearance between the head element section and recording disk by means of thermal expansion. A head slider includes a TFC heater. The hard disk drive detects its acceleration and controls the TFC heater in accordance with the detected acceleration, thereby reducing the probability of collision between the head element section and recording disk. Further, the hard disk drive detects residual vibration prevailing after impact application. The heater turns back ON when the residual vibration becomes lower than a reference level.Type: GrantFiled: December 21, 2006Date of Patent: November 10, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satoshi Hayakawa, Masakazu Sasaki, Kohichi Takeuchi, Jun Ishikawa
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Publication number: 20090086376Abstract: Embodiments of the present invention provide an inexpensive latching mechanism having a necessary and sufficient function to hold an actuator of a magnetic disk drive and including a latch formed in a one-piece structure. According to one embodiment, a latching mechanism for a magnetic disk drive includes a latch lever, a hook, for latching an actuator, extending vertically downward from the latch lever, and a bar, to be pressed by an actuator at its home position in a closing direction, extending vertically downward from the latch arm. A steel pin is attached to the latch lever to urge the latch in an opening direction by a magnetic force.Type: ApplicationFiled: September 24, 2008Publication date: April 2, 2009Inventors: Takeshi Chawanya, Mutsuro Ohta, Masakazu Sasaki
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Publication number: 20090086377Abstract: Embodiments of the present invention help provide a simple and inexpensive actuator mechanism for a magnetic disk drive. The actuator mechanism includes an approximately circular coil and a simple shaped magnet, and is capable of displaying adequate performance required for the magnetic disk drive. According to one embodiment, the magnetic disk drive includes an actuator mechanism which has an approximately circular coil and an approximately rectangular magnet. The long axis direction of the rectangular magnet is oriented in parallel to a straight line connecting the center of the inner circle of the circular coil in a state in which the actuator is positioned at the outermost circumference of a data area and the center of the inner circle of the circular coil in a state in which the actuator is positioned at the innermost circumference of the data area.Type: ApplicationFiled: September 25, 2008Publication date: April 2, 2009Inventors: Mutsuro Ohta, Masakazu Sasaki, Takeshi Chawanya, Kenji Suzuki
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Publication number: 20080151433Abstract: Embodiments of the present invention help to suppress performance degradation in an actuator of a disk drive device when attaching a damping member to a single surface of an arm. According to one embodiment, in a HDD a damping member is attached to a single surface of an arm. A shape of an inner arm is asymmetric with the center position between disks. Specifically, the thickness from a center position between the disks to the damping material attaching surface is thinner than the thickness from a center position between the disks to an opposite surface of the damping member attaching surface. This suppresses deformation of the vibration mode in the case that the damping member is attached to the single surface of the arm.Type: ApplicationFiled: November 30, 2007Publication date: June 26, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Eiji Soga, Masakazu Sasaki, Hajime Eguchi, Hiromitsu Masuda
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Publication number: 20080019032Abstract: Embodiments in accordance with the present invention improve the head characteristic and avoid collisions between a head element section and a recording disk. A hard disk drive according to an embodiment of the present invention performs TFC (Thermal Fly height Control) to adjust the clearance between the head element section and recording disk by means of thermal expansion. A head slider includes a TFC heater. The hard disk drive detects its acceleration and controls the TFC heater in accordance with the detected acceleration, thereby reducing the probability of collision between the head element section and recording disk. Further, the hard disk drive detects residual vibration prevailing after impact application. The heater turns back ON when the residual vibration becomes lower than a reference level.Type: ApplicationFiled: December 21, 2006Publication date: January 24, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satoshi Hayakawa, Masakazu Sasaki, Kohichi Takeuchi, Jun Ishikawa
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Publication number: 20080007862Abstract: Embodiments of the present invention restrain the head position accuracy from degrading due to torsional vibration of a head supporting unit. According to an embodiment of the invention, an actuator has a twisted carriage arm. A suspension is tilted in accordance with the twist of the carriage arm. When the carriage arm and the suspension torsionally vibrate, the vibration direction tilts against the normal direction of a recording surface in accordance with the twist. This technique decreases a peak value of off-track displacement that is caused by a head slider and is dependent on relationship between a skew angle and a torsional vibration direction.Type: ApplicationFiled: June 26, 2007Publication date: January 10, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satoshi Hayakawa, Takeshi Chawanya, Masakazu Sasaki, Kenji Suzuki
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Publication number: 20070159716Abstract: In an embodiment of the present invention, at least one mechanical fastener is used to mount a voice coil magnet assembly of a hard disk drive on a housing of the hard disk drive. A layer of a material having a low friction coefficient is disposed between the housing and the voice coil magnet assembly.Type: ApplicationFiled: January 10, 2006Publication date: July 12, 2007Inventors: Steven Hanssen, Masaki Kohno, Masakazu Sasaki, Jr-Yi Shen
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Patent number: 6995969Abstract: An electric double layered capacitor is provided, which can ensure a cooling capability by radiating heat to an outside air. The electric double layered capacitor comprises a capacitor cell 1 including a bag-shaped soft case in which a plurality of positive electrodes and negative electrodes, and a separator are received and laminated together with an electrolytic solution, a belt-shaped radiating fin 5a which extends from a rim of the soft case, a heat transfer frame 15 to sandwich the radiating fin 5a, and a metal hard case 21 for thermal radiation in which a plurality of the capacitor cells 1 are received/laminated through the heat transfer frames 15.Type: GrantFiled: March 19, 2003Date of Patent: February 7, 2006Assignee: Nissan Diesel Motor Co., Ltd.Inventors: Shuuichi Araki, Yoshiaki Yamada, Masakazu Sasaki