Hitachi Media Electronics Co., Ltd.

Hitachi Lighting, Ltd.

Yasushi Kinoshita

Hidenao Saito

Seiichi Katou

Seiji Ono

Akio Yabe

Naomitsu Kuroda

Kazuhiro Todori

Katsuhiko Kimura

Norio Nakazato

Jun Hato

Seiichi Kato

Kazumi Takahashi

Rika Nomura

Souichirou Yamada

Naoki Yotsumoto

Eiji Okubo

Keisuke Nishimura

Takeshi Oikawa

Daisuke Nakahara

An optical pickup includes a lens moving mechanism constructed of a lens, a lens holder holding the lens, a guide member guiding the lens holder, a lead screw including a thread groove, a motor rotating the lead screw, and a rack gear including a body fixed to the lens holder and claws fitted into the thread groove of the lead screw, in which an arm connecting the body and the claws of the rack gear is formed so that the shape of a cross section perpendicular to the rotational axis direction of the lead screw is a convex shape, a recess shape or a wave-shape.

Optical pickup

An optical pickup has a laser light source, beam splitter, collimator lens, reflection mirror, objective lens and photo detector are mounted in a case. An objective lens actuator includes a magnetic member and magnet. The optical pickup may become contaminated by uncured adhesive remaining at the edges of the adhesive surfaces of the magnet and the magnetic member that is transferred to the optical pickup via finger cots or tweezers, etc. In an adhesion step between the magnet and the magnetic member, in which part of a groove near to the center of the surface has a small depth and part of the groove near to the outer circumference of the surface has a large depth, an adhesive is drawn toward the center of the surface of the magnetic member by a capillary phenomenon and is prevented from spreading along the outer edge of the surface.

An aspect of the invention provides an optical pickup in which an optical axis is not displaced even if ambient temperature is changed. The optical pickup of the invention has an optical unit and an optical pickup case. The optical unit has a lens member having an optical axis, and the optical axis of the lens member is offset to one side from the center of the optical unit. The optical pickup case holds the optical unit from both sides. A thermal expansion amount of the optical unit is absorbed by compression amounts of a first adhesive and a second adhesive such that the optical axis of the lens member is not displaced when the optical unit is thermal expanded.

Optical pickup having thermal expansion compensation

In an optical element feeding device and an optical pickup unit using the same, in order to make the device compact and light and achieve a stable operation, the device has a main shaft and a sub shaft supporting a movable frame in which an optical element is arranged in such a manner as to be movable in a direction of an optical axis, a stepping motor, a lead screw rotating on the basis of a rotation of the stepping motor, a resin nut engaging with the lead screw and being movable in the direction of the optical axis on the basis of the rotation of the lead screw, and a spring pressing the movable frame in the direction of the optical axis so as to bring the movable frame into contact with the nut, and a cushioning material is provided between the nut and the movable frame so as to connect the nut and the movable frame.

Optical element feeding device and optical pickup unit using the same

An optical pickup device includes a hosing having three walls connected together whose horizontal cross-section is substantially U-shaped. A first wall supports one end of a shaft, a second wall facing the first wall supports the other end of the shaft and a third wall connects the first and second walls. A lubricant tray is surrounded by the three walls and the shaft. By the shaft being attached to an end side surface of the lubricant tray, the shaft can be integrally formed with the housing. A radius of curvature or an angle formed on a horizontal cross-section of the three walls is larger than a radius of curvature or an angle formed between one of the three walls and the lubricant tray.

Optical pickup device

When a long illuminant module is constructed, debonding of a bonded interface or bending occurs due to a difference in a magnitude of thermal deformation between a lens material and a metal substrate. In an illuminant module including light emitting elements, a substrate on which the light emitting elements are mounted, a transparent encapsulating resin which encapsulates the light emitting elements, and a lens material having cavities formed therein, in which the respective light emitting elements and transparent encapsulating resin are stored, notches are formed in a surface of the lens material on the side of the substrate, and the notch surfaces of the notches and the surface of the substrate are bonded using a bonding material.

Liquid crystal display, illuminant module and its manufacturing method

In an optical pickup, it is configured such that a first and a second thrust bearings of a motor rotation shaft, a lens holder to be moved in a thrust direction by the motor rotation shaft, and a preload unit which exerts preload of the thrust direction on the lens holder are included, and the second thrust bearing can adjust a position in the thrust direction. In addition, the first and second thrust bearings and the motor rotation shaft are made of conductor, and the optical pickup is manufactured by including the processes of: moving the second thrust bearing in a direction approaching to the motor rotation shaft till electrical continuity between the first thrust bearing and the second thrust bearing is obtained using an electrical continuity checker; subsequently moving the second thrust bearing in a direction departing from the motor rotation shaft; and subsequently fixing the second thrust bearing to the base.

Optical pickup for use in optical disk device and method of manufacturing the same

In a lens actuator on which a first lens and a second lens are mounted, since the first lens and the second lens are disposed side by side, a problem is involved such that the lens actuator is bulky. The present invention provides a lens actuator comprising a first lens and a second lens having different optical paths, disposed between a light emitting element and an object lens, a holder for holding the first lens and second lens such that the optical axes of the first lens and second lens are parallel to each other, and a driving mechanism for driving the first lens and second lens each in the optical axis directions, wherein the first lens and second lens have respective outer periphery parts respectively outside the effective diameter, and the outer periphery parts of the first lens and the second lens are disposed to be partially overlapped with each other when viewed from the first lens and second lens optical axis direction.

Growing community of inventors

Hitachinaka, Japan

Yasushi Kinoshita