Sony Corporation

Kazuo Sasaki

Shuichi Kikuchi

Hitomi Chiba

Kengo Saitou

Osamu Koizumi

Taizo Aizawa

Kengo Saito

Takaaki Sanpei

Masayuki Itabashi

Mitsue Sakurai

Yasuyuki Kudo

Tsuneo Nemoto

Shintaro Higuchi

Yuichi Sasaki

Toshiro Kobayashi

Kazuhiro Okamoto

Taizo Fukuda

Haruo Ishizaki

Toshio Hikichi

Osamu Yamaura

Junya Ohmachi

A tape cartridge is configured to include a cartridge case, a hub, around which a magnetic tape is wound around and is housed in the cartridge case rotatably, and a drive apparatus for driving the hub to rotate, the drive apparatus being arranged between a bottom portion of the hub and the cartridge case.

Tape cartridge

A tape cartridge that has a clamp force to a block body and that secures a leader tape to a leader block is provided. Nail portions () formed on the outer surface sides of a pair of leg portions () of a clamper (') are secured to securing grooves () formed on side walls of a assembling concave portion () of a block body () to secure the block body () and the clamper (&#x2032;). At this point, with concave grooves () and a reinforcement rib () formed on an inner surface side of a base portion () that composes the clamper (&#x2032;) in the elongation direction of the leg portionsand. Thus, when the clamper (&#x2032;) is pushed, it can be prevented from being damaged and a desired clamp force can be obtained.

A tape reel in which molding quality of a flange unit is improved so as to improve reliability at the time when a magnetic tape runs at high speed, and a tape cartridge having the same. A plurality of reference planes () formed between a chucking gear () and an outer peripheral rib () formed at an outer peripheral side of this chucking gear () are provided separately from the outer peripheral rib (). And the reference plane () is formed with edge planes of each of a first rib () extending toward a circumference and a second rib () extending toward a direction crossing the first rib (). According to this arrangement, a volume at a portion constituting the reference plane () is made smaller, occurrence of a sink after a resin is hardened is suppressed, and molding quality of the flange unit () is improved so that straight runnability of the magnetic tape at high speed running and reliability in recording/reproducing operation are improved.

Tape reel and tape cartridge having the same

In a tape cassette, an erroneous erasing preventive or write protect device includes a plurality of discriminating detectable portions provided in a cassette body or casing and a discriminating plug for opening and closing at least one of the discriminating detectable portions. The discriminating detectable portions are formed collectively in a single indented part with no separating walls.

Tape cassette

The present invention provides a paint coating apparatus having a die head capable of simultaneously forming at least two paint layers on a surface of a support body into thin and uniform films. The paint coating apparatus includes a die head having a front lip, a first paint discharge slit to discharge a first layer paint, an intermediate lip, a second paint discharge slit to discharge a lower layer paint, and a rear lip arranged in this order from the upstream at least in the travel direction of the support body, wherein one of a curved plane and slanting plane is formed at a ridge line formed by a tip surface of the intermediate lip and a wall surface of the second paint discharge slit.

Paint coating apparatus and magnetic recording medium

A method for punching a template is provided comprising the steps of partially punching the template by applying a first punch to a first surface of the template to form a recessed portion thereof and by applying a first die to a second surface of the template to form a projected portion thereof, so as to produce a first shear plane connected with the first surface on a peripheral surface of the recessed portion and a second shear plane connected with the second surface on a peripheral surface of said projected portion; returning the projected portion so as to be substantially aligned with the recessed portion by holding the first surface and the second surface between a second punch and a second die; and fully punching the template by applying a third punch to the second surface and a third die to the first surface to as to produce a third shear plane connected with the second surface on a peripheral surface of the recessed portion and a fracture plane connected between the third shear plane and the first shear plane thereby causing a portion of the template to fully punched therefrom.

Method of punching template for forming a base plate of a tape cassette

A tape cassette includes a shell, first and second bosses arranged on the inner surface of the shell, and a prism mounted on the inner surface of the shell and formed with first and second holes and having an optical axis which corresponds to an optical axis of light emitted from a tape-position sensor of a drive. The first and second bosses are arranged through the first and second holes. When the first and second bosses contact the inner peripheral surfaces of the first and second holes, a first clearance between the first boss and the first hole and a second clearance between the second boss and the second hole is produced in the opposite direction of the first and second bosses with respect to the optical axis of the prism.

Tape cassettes

A recording medium accommodation cassette, wherein a part of a cassette shell is formed of a metallic plate, which is formed with a punched hole formed by press, and the metallic plate is disposed such that a shear face of the punched hole therein is located inwardly of the cassette thereby being in contact with a structural part within the cassette thereby inhibiting a burr produced in a punched hole in the metallic plate from being in contact with a structural component within the cassette (e.g., a reel) to produce shaving powders or particles.

Recording medium accommodation cassette

A recording medium storage cassette includes a cassette housing composed of an upper cassette shell and a lower cassette shell and in which a part of an outer ornamented body of the cassette is formed of a metal plate member made by press-treatment.

Metal plate member forming a portion of a cassette housing for a

A magnetic recording medium according to the present invention exhibits not only a good surface property but also a high electromagnetic transduction characteristic. The magnetic recording medium includes a non-magnetic substrate, a lower layer provided on the non-magnetic substrate and composed of a non-magnetic powder and a binder and an upper layer provided on the lower layer and composed of a ferromagnetic powder and a binder, wherein the upper layer has a thickness of not more than 0.5 .mu.m, and the lower layer contains as said non-magnetic powder an acicular iron oxide powder which has a longer axis length of 0.05 to 0.2 .mu.m and an aspect ratio of 2 to 10.

Magnetic recording medium

A tape cartridge comprises a base plate, a pair of tape reels rotatably supported by a pair of upstanding reel shafts which shafts are supported on the base plate, and a magnetic tape wound on the tape reels wherein a plurality of tape guides are provided to define a tape travel path. The base plate is formed with an aluminum-alloy plate with a hard protective film on both faces of the aluminum-alloy plate and small impressions in the hard protective film for elimination of residual strain. The hard protective film is formed by an anodic oxidation coating. In order to eliminate residual stress or strain existing in the base plate formed by a punching operation, each of the small impressions is formed by impressing the hard protective film to a depth within a thickness of the hard protective film or to a depth within a permissible limit of deformation (elongation) of the hard protective film.

Base plate assembly for tape cassette for increasing corrosion resistance

The present invention provides a data cartridge having a cartridge case (1) capable of containing either of two kinds of magnetic tapes differing from each other in width. The data cartridge is provided with a pair of guide rollers (8) for guiding a driving belt ((9) for driving a magnetic tape (5). Each guide roller (8) has a crowned working surface (8a) having a maximum portion having a maximum diameter. The maximum portion is dislocated from a position corresponding to the middle between the opposite ends of the guide roller (8) toward one of the opposite ends by a specific distance. Each guide roller (8) is set in a position in which the maximum portion is below the position corresponding to the middle between the opposite ends when the data cartridge is provided with a first magnetic tape (1/4 in. magnetic tape) or in a position in which the maximum portion is above the position corresponding to the middle between the opposite ends when the data cartridge is provided with a second magnetic tape (8 mm magnetic tape) having a width greater than that of the first magnetic tape.

Growing community of inventors

Miyagi, Japan

Kazuo Sasaki