Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Hirofumi Ouchi

Seiichi Handa

Yoshio Kasuga

Masao Kouhashi

Tatsunori Hibara

Hiromasa Ishii

Seiichi Watanabe

Kouichi Yamada

Masaru Okada

Toshihisa Obuse

Hiroshi Kobayashi

Satoru Akutsu

Yuji Nakahara

Nobuaki Miyake

Hiromi Ito

Yuichiro Murata

Hitoshi Tamayama

A method for manufacturing a magnetic head core of a complex magnetic head includes binding a first core material of a U-shaped cross section and a second core material of a flat plate shape to form a tubular core material having two bonded portions between the first and second core materials. Then a plurality of grooves are formed in the tubular core material across one of the bonded portions to form a plurality of track surfaces. The grooves are then filled with a fused glass material, and the other of the bonded portions is removed to form a substantially U-shaped core block having a plurality of track surfaces separated by the glass-filled grooves. The U-shaped core block is then sliced along each of the grooves to obtain a plurality of magnetic head cores. A complex magnetic head manufactured by the method is also disclosed.

Complex magnetic head and manufacturing method of complex magnetic head core

Manufacturing method of complex magnetic head core

A radial gap type medium driving motor for rotating a recording medium has first coil units having first windings of a first number of layers and second coil units having second windings of a second number of layers that is larger than the first number of layers. The first and second coil units are formed by winding wire on tooth-like poles of tooth-like pole blocks of a stator. A frame provided with a bearing portion for rotatably supporting the medium driving motor has a first accommodating portion for accommodating the first coil units and second accommodating portions for accommodating the second coil units.

Magnetic recording apparatus having medium driving motor with reduced

A complex magnetic head in which magnetically separated upper and lower rank core chips are spaced apart and connected to a support block made of a nonmagnetic material in such a way as to be in parallel with each other. Each of the upper and lower rank core chips have first, second and third cores. Magnetic gaps, whose track widths are different from each other, are provided between the first and second cores of one of the upper and lower rank core chips and between the second and third cores of the other of the upper and lower rank core chips, respectively.

Complex magnetic head having upper and lower rank core chips and method

A magnetic head is disclosed which includes in a preferred embodiment a head core (1) sandwiched between a first slider (2) and a second slider (3) both bonded to the core (1), said first and second sliders (2) and (3) being made from a resin composition comprising an epoxy resin composition and a filler comprising silica having a coefficient of thermal expansion of from 5.times.10.sup.-7 to 6.times.10.sup.-7 /.degree. C. as the main component and from 3 to 30 wt % at least one minor component selected from alumina, mullite, barium titanate, forsterite, steatite, and zircon, the amount of the filler being from 50 to 95 wt % based on the amount of the epoxy resin composition. The magnetic head is inexpensive, does not suffer deterioration of the magnetic characteristics of the head core, and is free from the problem of sticking to a floppy disk, head wear, or media wear.

Magnetic head

In relation to the magnetic head using a polycrystalline Mn-Zn ferrite as a core material, a magnetic head manufacturing method is provided for preventing the generation of the post-recording noise which is a pulse noise generated immediately after the completion of a current flow through the recording and reproducing coil. A fused core block is manufactured using Mn-Zn ferrite having a mean crystal grain size of equal to or less than 30 .mu.m as the core material of at least the recording and reproducing head and glass fusion using one type of glass, and the fused core block is annealed at a temperature equal to or higher than the strain point of the glass.

Method for manufacturing a magnetic head

Growing community of inventors

Tokyo, Japan

Hirofumi Ouchi