Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Akinaga Natsui

Shunsaku Muraoka

Kenji Hasegawa

Koichi Osano

Yasuhiro Nakatani

Takeshi Morita

Ken Takahashi

Norimoto Nouchi

Noboru Itoh

Syouzou Ninomiya

Provided is an optically recordable or reproducible tape recording medium including tracking pattern groups and non-tracking pattern areas. The tracking pattern groups are repeatedly provided along a longitudinal direction of the tape, and each of the groups includes a plurality of tracking patterns. The non-tracking pattern areas are respectively provided between the tracking patterns. In addition, the non-tracking pattern areas have different lengths along the longitudinal direction of the tape.

Tape recording medium, information recording/reproducing device, and method of manufacturing tape recording medium

Provided is a tape recording medium including: a base layer having a first surface and a second surface; a first recording layer disposed over the first surface of the base layer and capable of optically recording first data; an imprinted layer disposed between the base layer and the first recording layer; and a second recording layer. The second recording layer is disposed over the second surface of the base layer, contains a magnetic material, and has recorded second data different from the first data.

Tape recording medium having both optical and magnetic recording layers

An information recording and reproduction device comprises an optical pickup that has an objective lens and records information to a tape-form medium or reproduces information from a tape-form medium using laser light; a tape threading component that allows the tape-form medium to be arranged opposite the objective lens; a controller that detects that the tape-form medium is a cleaning tape; a movement mechanism that operates so as to bring the tape-form medium and the objective lens into contact with each other, in response to the detection by the control unit; and a first drive mechanism that plays out the tape-form medium in a state in which the tape-form medium and the objective lens are in contact with each other. The information recording and reproduction device is capable of cleaning the optical pickup even with a tape-form medium.

Information recording/reproduction device, cleaning tape, and optical pickup cleaning method

The data recording apparatus for recording data to a recording medium having one or more tracks arranged in parallel comprises a data recorder configured to record data to the one or more tracks, a memory configured to store data, and a controller configured to control the data recorder. The controller determines whether or not the one or more tracks include a data defective region in which the data has not been recorded properly, stores in the memory the data that has not been recorded properly, designates a position corresponding to the data defective region, which is in a track arranged in parallel to the data defective region, and reads from the memory the data that has not been recorded properly, and records that data to the position corresponding to the data defective region.

Data recording method, data recording apparatus, and recording medium

In a magnetic head, a multilayer film is disposed, the multilayer film including metal magnetic films and non-magnetic films that are alternately laminated, and a boundary between the multilayer film and a magnetic oxide substrate or a non-magnetic substrate on which the multilayer film is to be formed is parallel with a gap section at a surface of the magnetic head for sliding with respect to a magnetic recording medium. The metal magnetic films constituting the multilayer film have two or more types of thickness, or the metal magnetic films constituting the multilayer film have a uniform thickness, and the uniform thickness t satisfies t&#x3c;v&#xd7;cos&#x3b8;/fmax, where v denotes a relative speed of the head to the recording medium, fmax denotes an upper limit of frequencies to be used and &#x3b8; denotes an azimuth angle. With this configuration, a magnetic head having a suppressed pseudo signal and reduced noise can be provided, and a magnetic recording/reproducing device incorporating this magnetic head can be provided.

Magnetic head with multilayer film including metal magnetic films and non-magnetic films and magnetic recording/reproducing device

A magnetic head that is less prone to wear and has a long still duration and a magnetic recording/reproducing apparatus including a high-speed rotary drum unit using the same are provided. Thus, in a magnetic head including two magnetic core halves and , each including at least one magnetic film made of a soft magnetic metallic material and a pair of substrates and sandwiching the magnetic film, arranged so that end faces thereof oppose each other with a magnetic gap being formed therebetween to form a magnetic path by the magnetic film in each of the magnetic core halves, at least a part of a sliding surface of each substrate with respect to a magnetic tape is made of a non-magnetic single crystal ferrite material and a crystal face orientation of the non-magnetic single crystal ferrite material at the sliding surface is set to be approximately &lcub;110&rcub; while a <110> direction of the non-magnetic single crystal ferrite material is approximately in parallel with a sliding direction of the magnetic head with respect to the magnetic tape.

Magnetic head and magnetic recording/reproducing apparatus

A metal-in-gap type magnetic head apparatus in which a pair of magnetic core half bodies, comprising a metallic magnetic film containing Fe as a main component on at least one magnetic core half body, are joined. In the above mentioned structure, at least a part of the surface of a supporting base of the magnetic head comprises a material having a lower standard electrode potential than the metallic magnetic film and thereby the metallic magnetic film has a high saturation flux density. Moreover, a magnetic head apparatus and magnetic recording apparatus of the present invention can have a high reliability even in the strong corrosive environment.

Magnetic head apparatus and magnetic recording apparatus using thereof

A ring-type magnetic head is of a structure in which a metallic magnetic film is sandwiched between two substrates, and the metallic magnetic film has a saturation magnetic field not less than 50 A/m in all directions parallel to a film plane thereof. Where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx greater than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not less than Tc and a second heat treatment at a temperature Ta of Tc-180.degree. C..ltoreq.Ta.ltoreq.Tc-30.degree. C. in the absence of any applied magnetic field. Where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx less than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not greater than Tx while a rotating magnetic field is being applied thereto and a second heat treatment at a temperature Ta of Tx-200.degree. C..ltoreq.Ta.ltoreq.Tx-50.degree. C. in the absence of any applied magnetic field.

Magnetic head and method of making same

A ring-type magnetic head is of a structure in which a metallic magnetic film is sandwiched between two substrates, and the metallic magnetic film has a saturation magnetic field not less than 50 A/m in all directions parallel to a film plane thereof; the direction of lamination of the sandwich is generally perpendicular to a gap-forming surface of the head; where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx greater than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not less than Tc and a second heat treatment at a temperature Ta of Tc-180.degree. C..ltoreq.Ta.ltoreq.Tc-30.degree. C. in the absence of any applied magnetic field; where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx less than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not greater than Tx while a rotating magnetic field is being applied thereto and a second heat treatment at a temperature Ta of Tx-200.degree. C..ltoreq.Ta.ltoreq.Tx-50.degree. C. in the absence of any applied magnetic field.

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Osaka, Japan

Akinaga Natsui