Victor Company of Japan, Limited

Masaki Murakami

Keiji Segawa

Norio Matsuda

Mikio Naoi

Hiroshi Nakamura

Toshio Konno

Hirofumi Imaoka

Susumu Kubo

Keiichiro Doi

Naoki Akiyama

Shinya Tominaga

Kaneo Yamamoto

Yasuyuki Mori

Kouji Takeda

Takayuki Nakashima

Yoshimasa Tanaka

A magnetic head using an MR element and a permanent magnet for applying a bias magnetic field to the MR element, and a lead frame of the head. A sheet of metal is punched or otherwise shaped in a predetermined pattern to produce the lead frame. The lead frame includes sections mounting the MR element and permanent magnet, lead connecting sections electrically connected to connecting sections of the MR element, and tape-contact sections which are flush with a tape-contact surface of the MR element. The lead frame mounted with the MR element and permanent magnet and provided with the lead connecting sections is placed in a metal mold having a predetermined configuration and buried and fixed in place in synthetic resin.

Method of manufacturing a magnetic head with an MR element

A coil assembly comprises a plurality of conductive spiral pattern layers which are piled up via (an) insulating layer(s) on a wafer. The electrical connection between the spiral patterns is established by means of a conductive member, which is a portion of the upper spiral pattern layer, filled in a through-hole which is made in the insulating layer so that the spiral patterns are connected in series to develop a high voltage when the coil assembly is moved in a magnetic field.

Coil assembly having stacked spiral pattern layers and method of making

An electrostatic capacitance type pickup stylus for use on an information storage disc comprises a crystal of diamond including a sliding face for slidable contact with the information storage disc, an electrode face supporting thereon a conductive electrode layer for detecting signals on the information storage disc as changes in electrostatic capacitance, a pair of first and second angularly spaced back faces adjoining the electrode face, and a pair of first and second angularly spaced guide faces adjoining each other and the first and second back faces, respectively. The sliding face is in the form of a pentagon defined by ridges respectively of the electrode face, first and second back faces, and first and second guide faces, the first and second back faces being symmetrical with respect to a line passing through a central point on the ridge of the electrode face and a junction between the ridges of the first and second guide faces, the first and second guide faces being symmetrical with respect to the line. The first and second back and guide faces are located in areas in which they can easily ground without causing damages to ridges between the adjoining faces.

Diamond pickup stylus with good grindability

A capacitance detection type record stylus comprises a body of artificial diamond having flat faces lying parallel to the crystal planes {111} and {100} wherein adjoining identical crystal planes are either {111} or {100}. A crystal plane {110} is formed between any two of the adjoining identical crystal planes by lapping the edge between them. A conductive material is deposited on the crystal plane {110} to form an electrode for detecting signals recorded as geometric variations on a recording medium. Because of the aligned carbon atoms beneath the crystal plane {110}, a substantial amount of the conductive material penetrates deeply into the diamond making the electrode resistant to wear.

Capacitance detection type record stylus and method for making the stylus

A cylindrical diamond body is shaped to form a truncated conical portion. A conductive layer is deposited on the diamond body extending from the truncated end to the other end of the body. The conical portion of the body with the conductive layer being attached thereto is lapped to remove portions of the layer and the diamond body to form a pair of substantially flat surfaces extending from the truncated end toward the opposite end leaving the conductive layer to form a narrow width electrode for picking just one information signal stored in the form of minute pits along a spiral track or concentric tracks.

Capacitance detection type stylus for grooveless disc records and method

Growing community of inventors

Yokohama, Japan

Masaki Murakami