Sony Corporation

Tadashi Ozue

Toshio Shirai

Yoshiteru Kamatani

Tomohiro Ikegami

Tatsuya Narahara

Takehiko Saito

Shinichi Fukuda

Nobuyuki Nagai

Yutaka Soda

Kiyoshi Ohsato

Teiichi Miyauchi

Takao Hiramoto

Joichi Daiba

Kazushi Ogawa

Mitsunori Sakama

Yoshihisa Takayama

Takashi Nakao

Ken Kobayashi

Yukio Watanabe

Hiroshi Meguro

Ryoki Honjo

Toshiya Kurokawa

Satoshi Ota

Takuya Kaeriyama

Katsumi Maekawa

Takeshi Ichimura

Takahiro Kawana

Seiichi Onodera

Hiroshi Miyoshi

Katsuya Arai

Tomoe Sato

Kyoko Suzuki

Masahiko Chaya

Ichiro Hashimoto

Katsuaki Ikema

Takanobu Kohno

Masayuki Kondo

Yutaka Iwamoto

Katsuhiro Kasuga

A thin film magnetic recording head comprises a substrate, a first magnetic core formed on the substrate, a second magnetic core having the front end face with a magnetic gap with respect to the front end face of the first magnetic core, and a coil for developing magnetic flux between the front end portions of the magnetic cores. A width of the second magnetic core at the front end portion thereof is chosen to be smaller than that of the first magnetic core. The second magnetic core is at a leading position relative to the second magnetic core in a traveling direction on a recording medium. In such configuration, it is possible to reduce side erase due to recording magnetic flux fringing and to achieve high density of magnetic recording while maintaining the conventional fabrication steps for the thin film magnetic recording head, thereby avoiding the problem in the fabrication.

Magnetic head with rectangular-shaped planar spiral coil and leading core width smaller than trailing core width

Attributes of data recorded on a magnetic tape are stored in an attribute information table saved in an MIC (Memory in Cassette) of a tape cassette accommodated in a tape streamer drive connected to a host computer. The attributes are recorded for every identifier used for identifying a recording unit of the data. For each identifier, the attributes include the name of a file, a title, a file creation date/time, a file updating date/time, the amount of data contained in the file, the type of the data and a compression rate of the data. The attributes include not only those supplied by the host computer but also attributes generated after a data recording operation as information on the recording location of data. The attributes generated after the data recording operation include a group number and an offset from the beginning of the group identified by the group number. For example, the present invention can be applied to the tape streamer drive.

Information-processing apparatus, information-processing method, programs and recording mediums

The present invention provides a lubricant capable of holding an excellent lubricating property under various types of service conditions, maintaining a lubricating effect for a long period of time and providing excellent traveling property, abrasion resistance, durability and the like, a recording medium using the lubricant and a carboxylic acid type compound constituting the lubricant. The lubricant is formed by using a carboxylic acid type compound having at least two carboxyl groups and one ester bond as represented by the following general formula (1) (for example, a compound as represented by the following chemical formula (1)) as a constituting mixture and, then, the thus-formed lubricant is allowed to be contained on or in a recording layer of the recording medium: in which Rf represents a non-substituted or substituted, saturated or unsaturated, fluorine-containing hydrocarbon group or hydrocarbon group; Es represents an ester bond; and R may be omitted or represent a non-substituted or substituted, saturated or unsaturated hydrocarbon group.

Lubricant, recording medium and carboxylic acid compound

A magnetic recording/reproducing head having a plurality of magnetic head elements for multi-channeling capable of achieving high density recording/reproducing capability, including: a plurality of magnetic recording/reproducing head layers each including magnetic recording/reproducing head elements fabricated by a thin film process and interposed between two insulating/magnetic shielding layers laminated on a non-magnetic substrate; the total of magnetic recording/reproducing head elements formed therein are displaced from each other in a head width direction, and each magnetic recording/reproducing head layer has a plurality of magnetic recording/reproducing head elements formed at a predetermined pitch.

Magnetic recording/reproducing head with head elements displaced in both head width and lamination directions

In a helical scanning type magnetic recording and/or reproducing apparatus for selecting one of output signals of two reproducing heads that are disposed at positions different by of 180&#xb0; and transferring the selected output signal with a rotary transformer of one channel, a rotor side winding of a reproducing signal channel of a rotary transformer is divided into two portions. The divided portions are connected at two positions that are opposite to output terminals of head amplifiers that amplify output signals of reproducing heads and that have self short-circuit switches. Without use of extra wirings, the head amplifiers are directly connected to the rotary transformer. An output signal of the reproducing head is selected by short-circuiting a self short-circuit switch of a head amplifier corresponding to a head that does not reproduce a signal.

Rotary head drum apparatus including a rotary drum having a head and a switch for selecting the head and magnetic recording and/or reproducing apparatus using the same

The present invention provides a magnetic head device for recording magnetic signals simultaneously through a plurality of recording heads into recording tracks laid oblique to a running direction of a magnetic tape, which includes first group to m-th group of multi-heads, each group having 'q' recording heads disposed side by side as being shifted in a recording direction into the recording tracks to form (q&#xd7;m) recording tracks with an identical recording width Tp. Every adjacent groups of the multi-head being disposed as being shifted from each other on the same straight line by a distance D determined by the equation to simultaneously form the recording tracks of first group to m-th group:&#xd7;(+1)

Magnetic head device and magnetic recording device

First, data is read from tracks formed on a tape-shaped recording medium by heads disposed on a rotary drum, to measure error rates. Next, of the tracks formed on the tape-shaped recording medium, a worst track suffering the highest error rate is detected based on the error rates thus measured. Then, a pair of reproducing heads that can reproduce the worst track thus detected at the lowest error rates is detected from the measured error rates. Thereafter, tracking servo control is performed such that the worst track can be scanned by the pair of reproducing heads. As a result, a reproducing apparatus capable of proper reproduction even when recorded tracks undergo variations in width and reproducing heads are erroneously mounted.

Reproducing apparatus and reproducing method for reproducing data by scanning slant tracks using a plurality of reproducing heads

A rotary drum includes a plurality of reproducing heads each having a plus azimuth angle (+azimuth angle), which heads are collectively arranged at a location in the circumferential direction of the rotary drum in such a manner as to be in close proximity to each other, to be taken as a +azimuth reproducing head group, and a plurality of reproducing heads each having a minus azimuth angle (&#x2212;azimuth angle), which heads are collectively arranged at a location in the circumferential direction of the rotary drum in such a manner as to be in close proximity to each other, to be taken as a &#x2212;azimuth reproducing head group, wherein the +azimuth reproducing head group and the &#x2212;azimuth reproducing head group are spaced from each other in the circumferential direction of the rotary drum. With this rotary drum, signals can be certainly reproduced from recording tracks with narrowed widths by using the multiple reproducing heads arranged on the rotary drum.

Rotary drum and magnetic reproducing apparatus or magnetic recording and reproducing apparatus using the same

A linear tape system has a multi-reproducing head MRh comprising a plurality of reproducing heads Rh each of which corresponds to one recording track Tr. Each reproducing head of the multi-reproducing head is arranged with a displacement in a width direction of the recording track. An entire width MRhw of the multi-reproducing head is enlarged larger than a width Trw of the recording track. In this manner, the linear tape system can reproduce the recording track recorded in a narrow width and provide a higher recording density.

Magnetic head apparatus, magnetic reproducing method, and magnetic reproducing apparatus in linear tape system

Disclosed herein is a rotary head drum unit including a cylindrical drum surface and a magnetic head for recording/reproducing a signal to/from a magnetic tape running along the drum surface. The magnetic head has a tape sliding surface adapted to come into sliding contact with the magnetic tape. The tape sliding surface of the magnetic head is positioned at a level lower than the height of the magnetic tape flying above the drum surface. The magnetic tape is brought into contact with the tape sliding surface by negative pressure. With this configuration, an increase in contact pressure of the magnetic tape sliding on the tape sliding surface of the magnetic head can be prevented and the contact pressure can be uniformed to thereby prevent a reduction and variations in magnetic recording or reproduction output.

Negative pressure type rotary head drum unit and magnetic tape drive using the same

A thin film magnetic head, in which: a magnetic gap thereof is disposed slantingly relative to a direction orthogonal to a scanning direction of the head corresponding to an azimuth angle; an upper magnetic core layer is positioned on a leading side preceding a lower magnetic core layer in a scanning direction of the head, a protrusion on the lower magnetic core layer has an inclined side surface inclined at an angle equal to or greater than the azimuth angle at least on one side surface in a direction of a track width thereof, and at least one edge of a side adjacent to the magnetic gap of a protrusion on the upper magnetic core layer is aligned on a line drawn extending from the inclined side surface of the lower magnetic core layer, thereby suppressing occurrence of side erasing in a magnetic recording medium during azimuth recording.

Tape drive head with lower core layer side inclined at angle equal to or greater than azimuth angle and aligned with upper core layer edge

In a helical scan type magnetic tape recording apparatus, one thin film multi-recording head is mounted on a rotary drum, wherein the multi-recording head includes N recording heads for recording N recording tracks at a predetermined track angle on a magnetic tape by one rotation of the rotary drum to perform recording for forming continuous recording tracks having the same track pitches, by determining rotary drum rotation and a tape speed in accordance with equation V=Tp&#xb7;N&#xb7;(RPS)/sin &#x3b8;, such that (N&#x2212;1) recording tracks having the same track pitches narrower than the head width and one recording track having a wider track width than that are formed by a first rotation of the drum, then by a second rotation, a preceding recording head overwrites the recording track having the wider track width to form a recording track having a track width equal to the track width of the recording track.

Magnetic tape recording apparatus for recording tracks having same track pitch

A rotary magnetic head apparatus which can be formed into a smaller size in which signals of a plurality of recording tracks which are recorded on a tape-like information recording medium are reproduced by using a plurality of reproduction heads without depending on the arrangement of the recording tracks in the information recording medium. The rotary magnetic head apparatus includes a rotary drum, a fixed drum, a reproduction signal selection device, a rotor reproduction signal wiring section, and a stator reproduction signal wiring section.

Rotary magnetic head apparatus for performing reproduction operations using a plurality of reproduction heads without depending on the arrangement of the recording tracks

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Kanagawa, Japan

Tadashi Ozue