Hitachi, Ltd.

Hitachi-Lg Data Storage, Inc.

Kouhei Takita

Ikuo Nishida

Kenji Ogiro

Tatsumi Nishijima

Yoshiaki Yamauchi

Tomomi Okamoto

Kyuichiro Nagai

Kyuichirou Nagai

Nobuo Masuoka

Atsushi Inoue

Nobuyuki Kaku

Takashi Takeuchi

Seiichi Katou

Hidekazu Takeda

Kenji Fuse

Atsuo Osawa

Hisahiro Miki

Katsuyuki Tanaka

Yoshiyuki Tanaka

Yukio Katou

Keiji Sasao

Katsuhiko Izumi

Mitsuji Aman

Toshiyasu Sawano

Hironori Saitoh

An optical disc apparatus includes a main guide shaft and a subsidiary guide shaft disposed so as to guide movement of a sliding base which holds an optical pickup. The optical pickup enables information recording and reproducing operations on an optical disc. The main guide shaft and the subsidiary guide shaft are configured so as to suppress vibrational resonance caused between the main guide shaft and the subsidiary guide shaft.

Optical disc apparatus with consistently differing guide shafts

A disc drive unit capable of preventing occurrence of errors in a recording system such as a CD or a DVD, using an optical head for recording data on a disc or reproducing data recorded on the disc. A disc tray is adapted to accommodate the disc, and load and unload the disc. A top cover is arranged above the disc. The top cover is formed therein with a concave and convex part for avoiding positioning a node of each of vibration modes (0, n) (where n=2, 3, 4) caused by a critical rotating speed of the disc, at a position right above the optical head.

Disc drive unit

The speed of a disc handling operation by a disc apparatus having disc changer capability is significantly increased and, at the same time, the disc handling operation is performed with stability. In the disc apparatus according to this invention, a plurality of reproducing units loaded with discs are moved independently and disc reproduction is started by returning the reproducing units to their dedicated positions. Simultaneous returning of the plurality of reproducing units is prevented and each reproducing unit moves for refuge while reproducing the disc. This novel setup significantly shortens the time for moving the reproducing units for disc reproduction. When continuously reproducing a plurality of discs accommodated in proximity, the plurality of reproducing units are moved in a stacked state rather than independently. This also contributes to a significant reduction of the time in the disc handling operation. Further, when raising the lower reproducing unit in the stack, it is moved together with the upper reproducing unit; when raising the upper reproducing unit, it is separated from the lower reproducing unit for independent movement. This prevents the reproducing units from colliding against each other. The novel constitution significantly enhances ease of use of the disc apparatus.

Disc auto changer for recording or reproducing information on a desired

In an auto-exchanger disc apparatus, both a disc cartridge for stocking plural discs and a pickup cartridge having a pickup are provided with common recesses, and a cartridge stocking unit is formed with a projection which is engaged with the recesses, whereby the cartridges can be exchanged for each other and mounted on the disc apparatus. Therefore, the extension and maintenance of the cartridges can be facilitated. When a double-side reproducing operation is performed, the pickup cartridge is turned upside down and then mounted on the disc apparatus, whereby the double-side reproduction can be surely performed by the disc inverting mechanism. Further, disc inclining means is provided to prevent a disc being returned from the disc feeder to the disc cartridge from abutting against the disc cartridge. The disc inclining mechanism and the disc inverting means may be integrally constructed by the same member to reduce the cost. Still further, a cleaning member is provided to some or all of the rollers for feeding the disc to perform a disc cleaning operation as well as a disc feeding operation, thereby preventing dust from being attached to the disc.

Disc inclining/disc inverting mechanism in a disc storage/playback

A magnetic recording/reproducing apparatus comprises a main chassis on which a cylinder having a rotary magnetic head attached thereto is mounted, a subchassis which is supported on the main chassis so as to be movable toward and away from the cylinder and on which reel mounts are mounted for engagement with reels of a magnetic tape cassette, a driving motor, tape guide members serving to form a predetermined path through which a magnetic tape moves so as to be wound around the cylinder, a pinch roller which cooperates with a capstan to hold the magnetic tape therebetween so as to move the magnetic tape in a predetermined direction, brakes for applying predetermined rotational loads to the reel mounts, operation members for operating the pinch roller and/or brakes, cam members for imparting a predetermined displacement to the operation members, and transmission members for transmitting the driving force from the driving motor to the cam members, wherein at least the driving motor, the brake members, as well as the transmission members, cam members and operation members which are associated with the brake members, respectively, are mounted on the subchassis.

Magnetic recording/reproducing apparatus

In a magnetic video tape recorder of the cassette type with a tape tension controller comprising a tension detection arm one end of which contacts with one surface of a magnetic tape drawn from the cassette in order to detect the change of the tension in the magnetic tape there is provided a pair of roller pins each is positioned at each side of the detection arm and contacts another surface of the magnetic tape. Since the magnetic tape is turned down with an acute angle at one end of the detecting area, the detecting arm can fully detect the change of the tension.

Tape tension controller for a cassette recording/playback apparatus

A tape guide moving mechanism for use with magnetic tape reproducing apparatus having a cylindrical cylinder mounted with a rotatable magnetic head thereon, and adapted to draw a magnetic tape from a tape cartridge and wound the magnetic tape on the cylindrical outer surface of said cylinder, comprising: a plurality of tape guides having a first group of tape guides and a second group of tape guides, drawing out the magnetic tape in a direction parallel to a plane perpendicular to the rotating axes of said supply and take-up reels; and drawing out the magnetic tape through said second position in slanting relation to a plane perpendicular to the rotating axis of said supply and take-up reel and winding said thus drawn magnetic tape around said cylinder in slanting relation to the plane section thereof.

Tape guide moving mechanism for magnetic record reproducing apparatus

Growing community of inventors

Mitaka, Japan

Kouhei Takita