Hitachi, Ltd.

Hitachi Global Storage Technologies Japan, Ltd.

Yuzo Yamaguchi

Mikio Tokuyama

Yoshinori Takeuchi

Satomitsu Imai

Shozo Saegusa

Masahiko Sega

Toshihisa Okazaki

Hayato Shimizu

Hiroshi Daito

Yokuo Saitoh

Shigeo Nakamura

Shigenori Togashi

Kazuo Sakai

Masao Iwakura

Toshiaki Kobari

Masayuki Kaiho

Kihachiro Tanaka

Taichi Sato

Hiroshi Nishida

Katsuaki Kikuchi

Katsuyuki Tanaka

Tetsuo Masukawa

Fumitaka Muranushi

Shoji Suzuki

Kenji Mori

Tsuyoshi Takahashi

Kanji Kawakami

Shinobu Yoshida

Takuji Torii

Hideyuki Kimura

Hiroyasu Nakajima

Masahiro Ojima

Kenichiro Matsubara

Takeshi Nakao

Takeshi Shibuya

Yoshinori Miyamura

Noriaki Okamoto

Osami Matsushita

Yoshihiko Miyake

Michiaki Ida

Takayuki Munemoto

Marutomo Goto

Youichi Kawakubo

Takashi Kohno

Toyoji Okuwaki

Shigeo Hara

Yukimori Umakoshi

Yoshiakira Karakama

Toshinori Kazama

Taro Sonoda

Shuji Onodera

Shouichi Setone

Kazunori Hori

Yoshiharu Mouri

Koosaku Wakatsuki

Shoi Suzuki

Kousaku Wakatasuki

Yoko Yamada

Hiroshi Daitou

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.

Magnetic disc unit with gap between magnetic disc and shroud

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.

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.

Magnetic disk apparatus with shroud and having open space downstream of moveable arms in communication with bypass channel

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.

Magnetic disc unit with range of gap between disc and shroud

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.

Magnetic disk apparatus with air flow bypass channel

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.

Magnetic disc unit

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.

Magnetic-disc unit with gap between disc and shroud

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.

Magnetic disk apparatus

A flying head slider supporting mechanism comprises a rigid body disposed away from the surface of a magnetic recording medium by a predetermined distance, an air flow passage extending through the rigid body to the surface of the magnetic recording medium, a device for generating an air flow passing through the air flow passage toward the surface of the magnetic recording medium or generating an air flow passing from the surface, a read/write head for reproducing data recording on the magnetic recording medium or recording the same on the magnetic recording medium, a head slider disposed in the air flow and supporting the read/write head, a device for supporting the head slider movable relative to the rigid body in a direction perpendicular to the surface of the magnetic recording medium, and a device for generating a relative movement between the head slider and the magnetic recording medium.

Flying head slider supporting mechanism having active air pressure

A flying head slider has a slider body in which gas bearing rails are formed on a surface thereof disposed in opposed relation to a recording medium. A bleed portion is also provided at the surface of the slider body between a pair of gas bearing rails. The bleed portion is composed of at least a rectangular-shaped deep bleed portion in which the pair of longer sides thereof are directioned in parallel to the longitudinal axis direction of the gas bearing rails.

Flying head slider and method of producing the same

A head arm for use in a magnetic disk drive, comprising a guide arm disposed between a magnetic head and an actuator so as to transmit actuating force of the actuator to the magnetic head thereby guiding the magnetic head along a plane of a magnetic disk, a printed circuit fixed to the guide arm, and deflection compensating member for making the coefficients of thermal expansion of said guide arm and said printed circuit substantially equal to each other in at least the direction of seek of the head arm. No thermal deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the temperature of the environment in which the magnetic disk drive is installed. A head arm may also comprise a guide arm and a printed circuit formed of a moisture absorptive material and covered at all or part of its surfaces with a covering layer formed of a moisture resistive material not permeable to moisture. No deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the humidity of the environment in which the magnetic disk drive is installed. Therefore, the possibility of occurrence of off-track can be minimized.

Guide arm with a fixed printed circuit board for magnetic disk drive

In a floating type magnetic head support mechanism for a magnetic disk apparatus, a slider carrying a magnetic head floats a small distance above a magnetic disk in accordance with a rotation of the magnetic head to enable a reading/writing of information from/onto the disk by the magnetic head. The slider is coupled to a distal end of a load arm through a gimbal. The coupling portion is located in a common plane parallel with a floating surface of the slider, with the coupling portion including a center of gravity of the slider or being in a parallel plane closer to the floating surface than the center of gravity. The magnetic head support mechanism is so constructed that no rotational moment is applied to a slider during the access operation by the access mechanism.

Floating type magnetic head supporting assembly including a coupling to

A magnetic head slider unit has a slider which is mounted so as to be movable relative to a magnetic medium such as a magnetic disk. The slider is shaped so as to generate an air pressure higher than ambient pressure between itself and the disk. A magnetic head for reading and/or writing data to the disk mounted on a movable member movable in a bore in the slider. In this way, the head may follows changes in the surface of the disk, by movement of the movable member in the bore, without inertial forces of the slider being transmitted to the disk. The movable member may be biased towards the magnetic disk by, for example, a spring, or creating a region of reduced pressure adjacent the movable member. Alternatively, the magnetic head may be mounted on a flexible arm.

Magnetic head slider unit having a float slider and magnetic head

In a rotary-disk transducer position control apparatus and method in which positional information concerning a transducer relative to a rotary disk based on a signal is obtained from the transducer which is disposed in opposition to the rotary disk, a seek instruction is inputted through an input device so that a first transducer access mechanism is caused to make the transducer perform a seeking operation at a low speed with a large stroke in accordance with both the positional information and the seek instruction, and in order to make the transducer perform both a seeking operation and a following operation, a second transducer access mechanism is caused to drive the transducer at a high speed with a small stroke in accordance with the positional information and the seek instruction.

Dual-actuator transducer position control apparatus for seeking and

A head arm for use in a magnetic disk drive, comprising a guide arm disposed between a magnetic head and an actuator so as to transmit actuating force of the actuator to the magnetic head thereby guiding the magnetic head along a plane of a magnetic disk, a printed circuit fixed to the guide arm, and deflection compensating member for making the coefficients of thermal expansion of said guide arm and said printed circuit substantially equal to each other in at least the direction of seek of the head arm. No thermal deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the temperature of the environment in which the magnetic disk drive is installed. The head arm may also comprise a guide arm and a printed circuit formed of a moisture absorptive material and covered at all or part of its surfaces with a covering layer formed of a moisture resistive material not permeable to moisture. No deformation in an out-of-plane direction occurs on such a head arm regardless of any variation in the humidity of the environment in which the magnetic disk drive is installed. Therefore, the possibility of occurrence of off-track can be minimized.

Guide arm with affixed printed circuit board for magnetic disk drive

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Tsuchiura, Japan

Yuzo Yamaguchi