Alps Electric Co., Ltd.

System Seiko Co., Ltd.

Shinichi Okuyama

Ken Toyoshima

Kazuhiko Watanuki

Akira Sato

Akio Kishimoto

Koji Yamazaki

Kouji Yamazaki

Koichi Yaba

A work W is rotated on a lower grinding wheel 13 provided on a work support base 11. Both surfaces of the work W are simultaneously subjected to grinding process by an upper grinding wheel 24 provided on a grinding shaft 22 of a grinding head 21 and the lower grinding wheel 13. The work W is applied with a pressure force of a primary load through the grinding shaft 22 by a piston rod 36 of a primary pneumatic cylinder 35 which is operated by a first air pressure. The work W is also applied with a pressure force of a secondary load through a lever member 43 by a piston rod 46 of the secondary pneumatic cylinder 45 which is operated by a second air pressure higher than the first air pressure. By adjusting the second air pressure, the pressure force is controlled.

Grinding method and grinding apparatus

A core slider for a magnetic head is disclosed, in which occurrence of the grain detachment from the slider due to microcracks produced at the fabrication of the slider is reduced by forming a hematite thin film on the surface portion of the core slider.

Method for fabricating core slider for a magnetic head

There is provided a method of manufacturing magnetic head sliders comprising the steps of cutting a material block, which may be of sintered ferrite or ceramic material, to form a core block and slider block. A groove is formed in the core block, which is bonded to the slider block using techniques to provide a magnetic gap. Thereafter the core block is machined to form a plurality of head cores, followed by machining the slider block to form in parallel a number of sliders, which are lapped and then sliced into individual magnetic head sliders. To prevent particles of material from the magnetic head sliders from separating from the sliders and causing deleterious effects, such as head crashes, a heat treating process is employed in which the slider block and core block are treated for from 3 to 20 hours at a temperature of from 100.degree. C. to 150.degree. C., at an ambient air pressure of from 1.5 to 5 kg/cm.sup.2 and at a relative humidity of not less than 60%. In one embodiment the heat treatment is performed immediately following the step of cutting the material to form the core block and slider block. In another embodiment, the heat treatment is performed immediately prior to lapping the sliders.

Method of manufacturing a magnetic head slider

Growing community of inventors

Nagaoka, Japan

Shinichi Okuyama