Fujitsu Corporation

Kenji Endo

Tsutomu Sasaki

Eisaku Takahashi

Eiji Okamura

Hirofumi Suzuki

Kazuhide Ohba

Atsushi Satoh

Norihiko Suzuki

Tatsuya Gofuku

Chihiro Ono

Isao Suda

Takahiro Ono

Hirokazu Ishizaki

Takashi Tokairin

Koichi Tohkairin

Masaru Saiki

An actuator assembly including a head actuator, a read/write FPC band, and a relay FPC. The head actuator includes an actuator arm with both a recessed step and a non-recessed surface on a mounting side thereof. The read/write FPC band has an end portion thereof disposed within the recessed step, such that the outer surface of the end portion of the read/write FPC band is aligned with the non-recessed surface. The relay FPC is attached to the non-recessed surface of the actuator arm, such that a connection area of the relay FPC is superposed upon a connection area of the read/write FPC band. Preferably, the connection area of the relay FPC and an area of said relay FPC attached to the non-recessed surface lie along a single plane. Such an arrangement eliminates a step or bend near the connection area of the relay FPC, allowing for simplified positioning of the relay FPC, as well as improved positioning accuracy.

FPC connection arrangement for a disk unit

For a balance adjustment due to a reduction in size and weight of an actuator, an arm portion, an axis attaching portion, and a coil supporting portion are arranged so that the centers of gravity on the coil side are located on a straight line connecting a rotational center and the center of gravity on the head side. Further, the improvement of an assembling efficiency of a VCM, an increase in torque, a one-touch fixing of an FPC connecting band, a noise prevention of a read pattern, and an insulation between the base and cover due to a bias of an MR read head are accomplished. A sector mark is detected by comparing a peak detection pulse and its reference polarity signal. A redundancy is provided to a reference detection polarity signal so that a read signal can be detected even if any one of the read signals of the sector marks is dropped out. A gray code detecting section for recognizing a cylinder address also detects on the basis of a peak detection pulse and a polarity signal due to the reading of a gray code. A memory space to store a program is divided into an ROM space of a small electric power consumption and an RAM space of a large electric power consumption and stores each peculiar program.

Head positioning control for disk apparatus using peak detection,

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Higashine, Japan

Kenji Endo