Matsushita Electric Industrial Co., Ltd.

Hiroyuki Hasegawa

Ken Takahashi

Tatsuaki Ishida

Ryuji Sugita

Eisuke Sawai

Hiromi Takeda

Kenji Hasegawa

Noriyasu Echigo

Yoshiyasu Honma

Akihiro Ashida

A magnetic head for attachment to a drum includes two magnetic cores butted against each other, and a gap is formed therebetween. A glass is bonded to the upper butted portion. A winding is provided on the magnetic cores, and electromagnetic transformation is carried out. On the sliding face of the magnetic head, two grooves and are formed with the gap positioned therebetween at positions symmetrical with each other in a rotation direction of the drum to provide good contact between the magnetic head and a magnetic tape or other magnetic medium. A protective film is formed on the surface of the sliding face. The magnetic head generates a negative pressure by virtue of the grooves formed in the sliding face in the rotation direction of the drum, thereby improving contact between the magnetic head and the magnetic tape.

Magnetic head having grooves to enhance contact with magnetic recording media and magnetic recording/reproducing apparatus

In order to improve reliability of an MR head including a substrate, an MR element formed on the substrate, a reinforcing body, and a sliding surface with respect to a magnetic recording medium, in which the substrate and the MR element are exposed to the sliding surface, the substrate and the reinforcing body are bonded to each other by using a non-organic film, for example, a multi-layered film including metal layers. Alternatively, the substrate and the reinforcing body are bonded to each other via an adhesive film not exposed to the sliding surface.

MR head with MR element and reinforcing body mounted via non-organic film

In a metal-in-gap magnetic head, a pair of magnetic core halves made of ferrite are arranged to oppose to each other, and metallic magnetic films are applied to each of opposing surfaces of the pair of magnetic core halves. A hard glass layer and a chromium layer are applied to a gap plane of the magnetic head as a gap layer. A gap is formed so as to abut on the chromium layers between a pair of the gap layers. The hard glass layer includes borosilicate as a main component and it has Vickers hardness of the same as that of said metallic magnetic films or less and softening temperature of 550.degree. C. or higher. Thus, a magnetic head does not generate a spacing loss when a tape slides thereon.

Magnetic head

An apparatus for recording and reproducing a signal using a thin film magnetic tape as a medium and using ring type magnetic heads for recording and reproducing the signal, wherein the gap length of the magnetic head for reproducing is larger than the gap length of the magnetic head for recording. Maximum recording and reproducing performance is achieved by implementing separate recording and reproducing heads.

Magnetic recording and reproducing apparatus

In a magnetic recording and reproduction apparatus wherein signals are recorded with a ring-type magnetic head to a magnetic recording medium having axis of easy magnetization oblique with respect to a film normal of a magnetic layer of the medium A recording magnetic field generated by the magnetic head is asymmetric with respect to a center line of a gap of the magnetic circuit, and the recording magnetic field in the magnetic layer around a leading edge of the magnetic head is inclined at the same side as the axis of easy magnetization in the magnetic field in a normal plane of the magnetic layer including a direction of relative movement of the magnetic head to the magnetic recording medium when signals are recorded to the medium. Thus, signals can be recorded at a high density. Various types of magnetic head for generating asymmetric magnetic field are provided.

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Kyotanabe, Japan

Hiroyuki Hasegawa