Hitachi Media Electronics Co., Ltd.

Kazumi Takahashi

Hiroaki Furuichi

Yoshio Oozeki

Rika Nomura

Satoshi Arai

Mitsuo Satake

Masayuki Okamura

Hiroyasu Yoshida

Taketoshi Moriyama

Hidenao Saito

Jun Hato

Seiichi Kato

Yasushi Kinoshita

Akiko Mizushima

Kazuhiro Todori

Katsumi Kuroguchi

To provide an optical pickup device adapted such that for adhesion fixing of a holder for holding an LD or a light-receiving element to an optical pickup casing via an ultraviolet-curable adhesive, curing shrinkage during ultraviolet irradiation can be reduced and adhesion fixing achieved with high positioning accuracy. In a structure for adhesion fixing of a holder for holding an LD or a light-receiving element to an optical pickup casing via an ultraviolet-curable adhesive, since protrusions are provided at peripheral sections (UV irradiation light source side) on a bonding surface of the holder, a section exposed to strong UV light is first cured, then after the adhesive has moved from an uncured section, the amount of shrinkage of the first cured section in a Z-direction is reduced, and the uncured section is cured.

Optical pickup device with protrusions in a laser beam direction to shield ultraviolet light and method for manufacturing the same

There is provided a low-cost and reliable optical pickup device, wherein an objective lens is in contact with an adhesive at least one or more portions and fixed to the adhesive and also the height of the adhesive for fixing the objective lens is higher than the surface of the objective lens or the end of the objective lens, thereby a sufficient adhesive strength is secured between the objective lens and a member to which the objective lens is adhered and further this adhesive serves also as a disc protector.

Optical pickup device having disc protector

In laser welding an optical part to a pickup case of an optical pickup device, outgas deposition on a lens surface can be inhibited, and positional shifting of the optical part can be reduced. The optical part has a lens surface facing in an optical axis direction and a protruding part formed, to be joined to the pickup case, at an end portion thereof in a direction perpendicular to the optical axis. A joint surface between the protruding part and the pickup case extends in a direction parallel to the optical axis, and the joint surface is fixed by a weld portion formed by laser irradiation. The joint surface is parallel to a bottom surface of the pickup case, and the height from the bottom surface is approximately equal to the height of the center of the lens surface.

Optical pickup device in which optical part is fixedly joined to pickup case by laser irradiation

An optical pickup device includes an optical part module having a light emitting device and an optical pickup case to which the optical part module is fixed by way of an adhesive, in which the optical part module is adhesively fixed by disposing a bonding surface of the optical part module to the optical pickup case at least at two positions on lateral surfaces of the optical part module putting an optical axis therebetween, and a bonding distance L in the lateral surface between the optical part module and the optical pickup is defined as: 40 &#x3bc;m&#x3c;L&#x3c;570 &#x3bc;m, whereby the optical pickup device can maintain an optimal position at a high positional accuracy without lowering a bonding strength even when a stress due to an external load by bending moment or circumstantial changes is caused to the optical part module, particularly in the case where the optical pickup device is thin.

Optical pickup device and optical disk drive apparatus

An optical pickup device includes a holder which holds an LD and a light-receiving element and an optical pickup case on which the holder is adhesively fixed via an ultraviolet cure adhesive, and is provided with a through hole on a bonding surface of the holder in order to reduce shrinkage when ultraviolet light is irradiated and to form a blind portion on which the ultraviolet light is not irradiated from a specific direction for adhesively fixing with high position accuracy.

Optical pickup device and method of manufacture therefor

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

The present invention provides an optical pickup device employing a disc protector that includes a plurality of first protrusions and at least one second protrusion disposed on the lens holder, wherein the first protrusions are formed by applying a first adhesive to a plurality of areas of a top surface of the lens holder, wherein the first protrusions are arranged at different locations in the tracking direction such that the objective lens is sandwiched between the first protrusions, wherein the at least one second protrusion protrudes is formed by applying a second adhesive to at least one area of the top surface of the lens holder, and wherein tips of the first protrusions are closer to the optical disc than a tip of the at least one second protrusion.

Optical pickup device and optical disc drive apparatus

An optical pickup device having an optical module provided with an optical element and bonded and fixed to an optical pickup case, wherein the optical module is fixed to the optical pickup case by a first ultraviolet curing adhesive at at least two positions with an optical axis between the positions, the optical axis extending from the optical element to the optical pickup case, and at least a part of an exposed surface of the first ultraviolet curing adhesive is covered with a second ultraviolet curing adhesive higher in hardness or elastic modulus than the first ultraviolet curing adhesive to diminish an optical axis offset of the optical pickup device, further, a heat dissipating material higher in thermal conductivity than the first and second ultraviolet curing adhesives is brought into contact with both optical module and optical pickup case to improve the heat dissipating performance of the optical pickup device.

Growing community of inventors

Toyokawa, Japan

Kazumi Takahashi