Combined magnetic write and read head for the vertical magnetization of a corresponding recording medium

US4639811A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Heinrich Diepers · Hochstädt, DE
• Herbert Schewe · Herzogenaurach, DE

Key dates

• Filing date: Dec 20, 1984
• Grant date: Jan 27, 1987
• Expiry date: Dec 20, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/1278
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A magnetic head for a recording medium which can be magnetized perpendicularly contains a ring head-like magnetic conduction body for carrying magnetic flux, the conduction body having two magnet legs, the poles of which are arranged one behind the other as seen in the direction of motion of the head and at a predetermined distance from each other. At least one coil winding is associated with the magnet legs, the turns of which extend through a space formed between the magnet legs. With this magnetic head, a switchable write and read function having high efficiency is obtainable. In addition to the mentioned coil winding serving only for executing a read function, an additional coil winding for executing a write function is provided which partly encloses one magnet leg. The other magnet leg has, at least in a subsection, a predetermined small cross section, so that this subsection is driven, at least largely, into magnetic saturation during the write function by means of the additional write coil winding while the read coil winding carries no current. The write function can be performed with the magnetic head as if it is a single-pole head.