Hitachi-lg Data Storage, Inc.

Hitachi, Ltd.

Shinsuke Takatsuka

Yosuke Ishizuka

Koji Matsumoto

Yoshiaki Yamauchi

Seiji Hamaie

Hisahiro Miki

Nozomu Harada

Kouji Fukuda

Takashi Nagai

Akihiro Ashida

Tomoki Hirata

Yuuki Yamasaki

A disk conveyance unitconveys the disk mediumto a position where recording and reproducing are performed by the pickupwith the spindle motorheld. The disk conveyance unitincludes first movement mechanismsandfor moving a first conveyance framewith respect to fixed framesandand second movement mechanismsandfor moving a second conveyance frameholding a spindle motorwith respect to the first conveyance frame. The first and second movement mechanisms move to substantially the same direction and operate independently from each other. This allows the disk of the hologram recording and reproducing apparatus to be moved at a high speed and positioned at a high accuracy.

Hologram recording and reproducing apparatus

To prevent an optical disc from being removed from a clamper even when an impact force is applied in an optical disc apparatus. A displacement amount by which a disc motor is sunk on the bottom case side is suppressed. In more detail, a convex portion which protrudes in the bottom cover direction is provided at a region including the whole or a part of an orthographically-projected surface of the disc motor on a surface of a bottom case opposed to a rear surface of the disc motor, and in a state of recording or reproducing, the sum of a distance between a motor fixing plate and a bottom cover and a distance between the bottom cover and the convex portion of the bottom case is smaller in the rotational axis direction of the disc motor than the sum of a distance between an optical disc and a tray and an insertion depth by which a clamper is inserted into a center hole of an optical disc.

Optical disc apparatus

In an optical disk apparatus, an ejection lock mechanism includes three (3) arm portions; i.e., a lock arm for locking a tray, being engaged with a lock member provided on a housing, a drive arm, in contact with the lock arm, for moving the lock arm to a position of being engaged with or releasing from engagement with the lock member, a solenoid having a movable plunger to be engaged with the drive arm, and a reset arm for restoring the plunger of the solenoid, wherein the reset arm is made up with an arm portion and an elastic portion, which are formed in one (1) body (as a unit) from a plastic, and the arm portion has two (2) arm pieces, and wherein a first arm piece has a function for moving the drive arm to the position of releasing from engagement with the lock member, through rotation thereof while being in contact with the lock member, and a second arm piece has a function for restoring the drive arm to a plunger storing portion of the solenoid, with a biasing force of the elastic portion, and the elastic portion has the 'U'-shaped portions, turning round to the reset arm through an upper portion of the drive arm, whereby rotation of the first arm piece in contact with the lock member makes a mutual distance between the 'U'-shaped portions, so as to maintain stability on the spring biasing force thereof.

Optical disk apparatus

In the case when a disk is transported into or out of an apparatus, local contact noise is generated in a drive transmission gear and a clutch portion of a disk loading mechanism. Also, this phenomenon gives rise to problems relating to damage of parts, life of a loading motor and the like. Thus, a disk loading mechanism is provided to perform two operations of driving a disk tray in a disk transportation direction by means of a loading motor provided with a worm gear, via a first wheel gear and a second wheel gear, and also vertically raising and lowering a unit mechanism via a slide plate. In addition, a unit for controlling whirling of the above worm gear is provided to reduce contact noise of the gear and clutch portion and improve the reliability of a disk drive apparatus.

Disk drive apparatus

Growing community of inventors

Hitachinaka, Japan

Shinsuke Takatsuka