Hitachi, Ltd.

Seiichi Baba

Takayuki Suzuki

Tsutomu Tanaka

Keisuke Yamaoka

Hiroshi Katou

Takeshi Abe

Hiromichi Hiramatsu

Kazuto Kinoshita

Kazuhide Ebine

Youichi Fukuoka

Toru Ueno

Kaoru Miyoshi

Toru Sakai

To provide a well balanced squirrel-cage rotor for an electric motor, quantities of braze used to bond various rotor components are different from each other so as to serve as balance weight in order to improve balance.

Squirrel-cage rotor for an electric motor and its production method

An apparatus having a magnetic head assembly including a plurality of arms each arm having a magnetic head fixed to a nose portion thereof and a magnetic disk unit having a plurality of magnetic disks mounted on a rotating shaft. The spacing between adjacent magnetic disks being set at a value corresponding to the thicknesses of the magnetic heads fixed to two of the arms, plus the thickness of the two arms, plus a rotating gap of the magnetic heads, plus a space of 0.1 mm or less. Further included is a disk height measuring device and a head measuring device for measuring the heights of the disks and the magnetic heads. An expansion device expands the spacing between the adjacent arms. The spacing between the adjacent arms being expanded an appropriate amount to provide optimal operation of the magnetic disk apparatus.

Magnetic disk apparatus and method and apparatus for assembling magnetic

Magnetic disk apparatus

A method for measuring the size of a wire rod comprises the steps of turning a laser beam from a laser beam source into a parallel beam used for scanning, disposing a first wire rod having an unknown size and a second wire rod having an already known size larger than the diameter of the spot of the laser beam adjacent to each other in a direction of scanning with the laser beam, receiving the laser beam traversed the first and second wire rods thereby generating a corresponding electrical output signal, and calculating the size of the first wire rod on the basis of the electrical output signal.

Method and apparatus for measuring the size of wire rod with laser beam

Growing community of inventors

Kamakura, Japan

Seiichi Baba