Sumitomo Chemical Company, Limited

Hitachi Maxell, Limited

Lintec Corporation

Maxell Holdings, Ltd.

Toshio Kawakita

Kozo Kotani

Taiichi Sakaya

Shinji Kawakami

Toshiya Kuroda

Tadayuki Ohmae

Kentaro Mashita

Sadamu Kuse

Takanori Kume

Yoshiki Toyoshima

Ryuma Kuroda

Masao Fujita

Noboru Yamaguchi

Kizuku Wakatsuki

Takeshi Yamada

Jinsho Nambu

Kiyohiko Nakae

Haruo Hayashida

Masashi Sugiyama

Masahisa Okawa

Teruaki Yoshida

Akihiro Ichige

Tomoyuki Emura

Kazunori Furukawa

Yufu Sato

Takashi Sakakibara

Taiichi Kawakita

Yoshitaka Owatari

A refractive index nL and an attenuation rate kL of a magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70&#xb0; from a lengthwise direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RL during vertical incidence of the linearly polarized light in the lengthwise direction is obtained based on nL and kL. A refractive index nT and an attenuation rate kT of the magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70&#xb0; from a width direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RT during vertical incidence of the linearly polarized light in the width direction is obtained from nT and kT. If a variation rate A (%) of RL and RT is A=|RL/RT&#x2212;1|&#xd7;100, the relationship A&#x2264;10% is established.

High recording density magnetic recording medium and recording/reproduction mechanism for the same

The present invention provides a magnetic head that can sustain favorable head contact even when magnetic tapes having different thicknesses are used. A magnetic head has a sliding surface coming in contact with a moving magnetic tape. An electromagnetic transducing element is disposed in the sliding surface. First edges are formed at each end of the sliding surface in the direction of movement of the magnetic tape. Second edges are formed in positions extended in the direction of movement of the magnetic tape from each end of the sliding surface and come in contact with the magnetic tape.

Magnetic tape head with limited ranges of tape wrap angle and distance between first and second edges

A servo controlling method of the present invention is a servo controlling method for controlling a position of a magnetic head against a magnetic tape that is accommodated in a cartridge and has at least a data track and a servo track, and the method includes the steps of: reading tape variance information from a magnetic tape cartridge () side, the magnetic tape cartridge () being composed of a cartridge () and a magnetic tape (); reading a servo signal recorded in the servo track by the magnetic head and converting the servo signal into head position information; and controlling the position of the magnetic head according to an off-track value based on the tape variance information and an off-track value calculated from the head position information. With this configuration, even in the case where a recording track width is narrowed and a tape speed is increased, the magnetic head can follow a recording track accurately at a high speed.

Servo controlling method, recording/reproducing apparatus, magnetic tape, and magnetic tape cartridge

In the apparatus and method of the invention, a servo signal reproduction unit generates a PES from a servo signal reproduced from a magnetic tape, and a frequency conversion unit performs FFT processing of the PES to generate frequency component information. Then, a filter value generation unit generates filter values based on the frequency component information and writes these to a memory. When recording various data signals to the magnetic tape, the filter values are read from the memory and a control filter serving as a notch filter is incorporated into a feedback control for a tracking servo. This enables periodic and narrow-band noise to be removed from a PES, consequently reducing PESs. Accordingly, learning-type optimum notch filter control that allows a magnetic head to follow recording tracks at high speed and with high precision is possible even when the recording track width is reduced and the tape speed is increased.

Servo signal recording apparatus, information recording apparatus, and tracking servo method

A magnetic head assembly of the present invention includes a head rail having a plurality of head element portions each including a MR element and sliding portions that come into contact with a magnetic tape, and a protective film on a magnetic tape sliding surface of the head element portions and the sliding portions, wherein the protective film is formed in a portion other than the vicinity of both ends of the head rail in a traveling direction, and an outermost surface of the protective film, on which a magnetic tape is capable of sliding, is formed flat. Thus, a magnetic head assembly used in a magnetic tape apparatus can be provided, in which an output does not decrease due to the abrasion deformation of the head element portions and the increase in spacing by the adhesion of stain.

Magnetic head assembly and magnetic tape driving apparatus

A servo signal recording apparatus of the present invention is provided with a tape motion measurement unitthat measures the lateral motion of a magnetic tape, and outputs tape motion information, a signal processing unitthat generates a servo signal that includes the tape motion information output from the tape motion measurement unit, and a servo signal recording headthat records the servo signal generated by the signal processing unitto the magnetic tape. The tape motion measurement unitmeasures the tape motion prior to the timing at which a servo signal is recorded to the magnetic tapeby the servo signal recording head, and records a servo signal that includes the tape motion information. This configuration enables a servo signal that can be used to perform tracking servo at high speed and with high accuracy to be written to a magnetic tape.

Servo signal recording apparatus

A resin composition comprising: a polyvinyl alcohol; and an inorganic laminar compound having an aspect ratio of not less than 50 and not more than 5000, which has a volume ratio of (inorganic laminar compound/polyvinyl alcohol) in the range of (5/95) to (30/70); and a laminate or laminate film comprising, as at least a portion thereof, a layer or portion (1) comprising such a resin composition. The resin composition, laminate or laminate film may exhibit a good gas barrier property while substantially retaining a good film strength.

Resin composition laminate and laminate film

A resin composition comprising: a polyvinyl alcohol; and an inorganic laminar compound having an aspect ratio of not less than 50 and not more than 5000, which has a volume ratio of (inorganic laminar compound/polyvinyl alcohol) in the range of (5/95) to (30/70); and a laminate or laminate film comprising, as at least a portion thereof, a layer or portion (,) comprising such a resin composition. The resin composition, laminate or laminate film may exhibit a good gas barrier property while substantially retaining a good film strength.

Resin composition, laminate, and laminate film

Bio-degradable resin composition, film and shaped article

A gas barrier resin composition or its film having very high level gas barrier and moisture barrier properties, which includes at least a high hydrogen-bonding resin and a non-film-forming inorganic laminar compound having a particle size of 5 .mu.m and an aspect ratio of 50-5,000. The resin composition or its film can be produced by dispersing a non-film-forming inorganic laminar compound in a high hydrogen-bonding resin or resin solution in such a state that the non-film-forming inorganic laminar compound is swollen or cloven with a solvent, and removing the solvent from the dispersion, if necessary in the form of a film, while maintaining the state.

Process for producing a gas barrier resin composition

Laminate, laminate film and shaped article comprising inorganic laminar

Gas barrier resin composition and its film and process for producing the

A method for compatibilizing at least two thermoplastic resins each having hydroxyl group(s), with each other, which method comprises reacting at least one of the thermoplastic resins with a boron compound simultaneously with or before mixing of the resins, to form a boric acid ester at least at the boundary of the resins; a resin composition comprising resins compatibilized with each other, obtained by the method; and a laminate whose at least one layer consists of the resin composition.

Method for compatibilizing resins with each other and resin composition

A film for labels having a high severability in die cutting consisting of a film having a phase separate structure produced by shaping into film a resin composition comprising 20 to 80% by weight a polypropylene resin, and 20 to 80% by weight a polyethylene resin having a density of 0.91 to 0.93 g/cm.sub.3 said film having a Young's modulus of 2000 to 6000 Kg/cm.sup.2 and a thickness of 0.02 to 0.20 mm.

Film for label

Growing community of inventors

Osaka, Japan

Toshio Kawakita