Hitachi Media Electronics Co., Ltd.

Junichi Senga

Katsuhiko Kimura

Hitoshi Matsushima

Manabu Ochi

Hiroyuki Toyoda

Takayuki Fujimoto

Takehiro Hayama

Seiichi Katou

Masayoshi Watanabe

Masaya Horino

Yoshihiro Satou

Tetsuo Itou

An optical pickup having a case made of a resin material reinforced with glass fiber, inorganic filler or the like with polyphenylene sulfide as a base material, and a metal plate formed of a material having a linear expansion coefficient within a range of a linear expansion coefficient of the case in a direction between bearings when a fiber orientation of the case is along the direction between the bearings or random. The metal plate has two rising members bended to the case side at both ends in the direction between the bearings. Two walls of the outer hull of an opening of the case at both ends in the direction between the bearings and the two rising members of the metal plate are alternately opposed, and the opposed walls of the case and the rising members of the metal plate are fixed using adhesives.

Optical pickup and disc drive using optical pickup

An optical pickup, having an optical pickup housing made of resin, for maintaining the heat radiation performance or capacity of a semiconductor laser, also an objective lens driving mechanism, and further a driver IC for the semiconductor laser, while keeping small-size and light-weight thereof, comprises a pickup housing, in which an optical part and a semiconductor laser are fixed; an objective lens, which is attached within the pickup housing; and an objective lens driving mechanism, which is configured to drive the objective lens, further comprising: a metal-made bottom cover, which is configured to cover a lower surface of the pickup housing and a side surface of an inner periphery of an optical disc, wherein the metal-made bottom cover and the semiconductor laser are thermally connected with each other.

Optical pickup

To increase the speed of operations and improve vibration properties by rotating holders to wind coils in objective lens driving means of an optical pickup. In an optical pickup wherein a tracking coil and two focusing coils are wound on the same surface of a coil holder, the coil holder includes a tracking coil holder and two focusing coil holders, and each of the tracking coil holder and two focusing coil holders has a hole passing through the center of each coil.

Optical pickup and method for manufacturing the same

An optical pickup devicecomprising a laser diode, a photo detector, a housinghaving an optical system for guiding light from the laser diodeto an optical disk and guiding light reflected on the optical disk to the photo detector, a wiringto supply current to the laser diode, and a metallic coverprovided outside of the housing, wherein

Optical pickup device with heat radiating structure

To improve the reliability to an environmental temperature change of an optical pickup, an optical pickuphas a semiconductor laserfor generating a laser beam. An objective lens drive leads the laser beam to a predetermined position of a disk. The semiconductor laser and objective lens drive are mounted on a pickup hosing. The objective lens drive has a movable portionand the movable portion has an objective lensfor condensing the laser beam on the recording face of the disk. A fixed portionholds the movable portion through a support member. The fixed portion has a magnetic yoke. An extended portion formed by extending a part of the yoke to the fixed portion side and the upsideof a cutout formed at the intermediate portion of the fixed portion in the tracking direction are adhered and fixed.

In an objective lens driving means of an optical pickup, the accuracy of the boundary position of magnets is improved, the generation of angular moment through coils is suppressed, and the inclination of the objective lens is reduced. An optical pickup for reading or writing information on an optical disc using an objective lens includes a lens holder for holding an objective lens, three magnets disposed facing to each of the two sides of the lens holder that are parallel to the focusing direction and the tracking direction, and a yoke for mounting these magnets. The yoke includes a central yoke surface for mounting the central one of the three magnets, and outer yoke surfaces for mounting the outer two of the three magnets. A step is formed between the central yoke surface and each of the outer yoke surfaces.

To reduce vibrations occurring in an objective lens driving apparatus there is provided an objective lens driving apparatus used in an optical pickup that reads/writes information from or onto an optical disk using an objective lens. The objective lens driving apparatus has a lens holder that holds an objective lens in a center part thereof, and a plurality of tracking coils that are disposed on both sides of the lens holder. The mass of a pair of first tracking coils that are disposed on one of the sides is greater than the mass of a pair of second tracking coils that are disposed on the other side.

Growing community of inventors

Yokohama, Japan

Junichi Senga