Fujitsu Corporation

Yukiko Oshikubo

Norikazu Nakamura

Hiroshi Chiba

Yoshiharu Kasamatsu

Tsukasa Itani

Takayuki Musashi

Keiji Watanabe

Eishin Yamakawa

Takeshi Toukairin

Jun Watanabe

Yoshihiro Nakata

Takashi Toyoguchi

Shinichi Nakayama

A package with built-in electronic components that is to be soldered to an electronic circuit board includes: an insulating layer; an electronic component provided on one surface of the insulating layer; and a pad which is electrically connected to the electronic component and in which a plurality of openings that extend from a first surface of the pad in contact with a solder bump to the insulating layer are formed, wherein an area of the plurality of openings at the first surface is larger than an area of the plurality of openings at a second surface of the pad, which is an opposite surface to the first surface and is in contact with the insulating layer.

Package with built-in electronic components and electronic device

A head slider that can furnish excellent head flying stability and a magnetic recording device having excellent head flying stability are provided. For the head slider, the protective layer is composed of two layers, that is, a lower layer and an upper layer thereon; the ionization potential of the lower layer is made to be smaller than that of the upper layer; and the surface free energy of the upper layer is made to be 45 mN/m or less.

Head slider and magnetic recording device therewith

There are provided a composition that exhibits sufficient flowability and also displays high substrate adhesion, and a magnetic recording medium, a head slider and a magnetic recording device that use this composition as a lubricant and are thus not prone to faults. The composition comprises a fluorine-containing polyether represented by formula (1), (in formula (1), p and q represent, independently of the symbols in other formulae, any chosen integers). The composition can be produced by reacting a polymer represented by formula (2) with glycidol,HOCHCFO(CFCFO)(CFO)CFCHOH&#x2003;&#x2003;(2)(in formula (2), p and q represent, independently of the symbols in other formulae, any chosen integers).

Composition, magnetic recording medium, head slider, and magnetic recording device

A magnetic recording medium having excellent durability and corrosion resistance as well as a magnetic recording device equipped with the magnetic recording medium is provided. The protective layer of the magnetic recording medium is composed of two layers, that is, a lower layer contacting with the magnetic layer and an upper layer on the lower layer. The internal stress of the lower layer is made smaller than that of the upper layer, and the surface free energy of the lower layer is made smaller than that of the upper layer.

Magnetic recording medium and magnetic recording device

A magnetic recording medium and head slider that can furnish excellent head flying stability, a magnetic recording device having excellent head flying stability, and a method for manufacturing, in a short time, a magnetic recording medium and head slider that can furnish such excellent head flying stability, are provided. For both of the magnetic recording medium and head slider, the protective layers are each composed of two layers, that is, a lower layer and an upper layer thereon; the ionization potential of the lower layer is made to be smaller than that of the upper layer; and the surface free energy of the upper layer is made to be 45 mN/m or less.

Magnetic recording medium, head slider and manufacturing methods therefor

A head slider to which little amount of contaminants is adhered, that can form a uniform and flat head lubricant layer surface and that has excellent ultra-low floating properties, as well as a magnetic recording device equipped with the head slider are provided. The head slider is equipped with a head slider lubricant layer having an average film thickness of not more than 2.5 nm, and composed of a water-repellent resin, the lubricant layer being formed on the head slider surface and head slider protection layer surface facing the magnetic recording medium, and the surface tension of the head slider lubricant layer determined by the Fowkes equation is not more than those of the head slider surface and head slider protection layer surface.

Growing community of inventors

Kawasaki, Japan

Yukiko Oshikubo