Objective lens actuator and optical pickup device

Abstract

A first objective lens and a second objective lens which are formed as separate bodies each other are held side by side by a lens holder. The lens holder includes a first lens receiving surface to receive a lower surface of peripheral portion of the first objective lens, and a second lens receiving surface to receive a lower surface of peripheral portion of the second objective lens. The first lens receiving surface and the second lens receiving surface are formed to be coplanar. By this arrangement an optical axis of the first objective lens and an optical axis of the second objective lens become parallel to each other at the same time when the first objective lens is installed on the first lens receiving surface and when the second objective lens is installed on the second lens receiving surface, a relative tilt is automatically solved. By a simple structure of the lens holder the relative tilt between the first objective lens and the second objective lens can be reduced as above described. Further, because of above described structure of the lens holder if one of the objective lenses is a commercial product, a commercial product can be easily utilized.

Description

technical field [0001] The present invention relates to an objective lens actuator holding a plurality of objective lenses side by side, and to an optical pickup device equipped with the objective lens actuator. Background technique [0002] Recently, optical recording media including compact discs (hereinafter referred to as CDs) and digital versatile discs (hereinafter referred to as DVDs) have become common and widely available. In addition, in order to increase the amount of information recorded on an optical recording medium, research to achieve a higher recording density of the optical recording medium has recently been started. As a result, high-density optical recording media (next-generation optical discs) such as high-definition DVD (HD-DVD) which is Advanced DVD or Blu-ray Disc (hereinafter referred to as BD) are about to be put into practical use. [0003] When information is recorded to or reproduced from such an optical recording medium, an optical pickup devi...

AI Technical Summary

Problems solved by technology

[0012] In the structure shown in JP-A-2006-019001 or JP-A-H11-120602, it is possible to precisely adjust the angle of the optical axis of one objective lens with respect to the optical axis of the other objective lens, however this leads conversely to the The problem of degraded performance with multiple objectives mounted on lens holders because of the need for such precise adjustments

Furthermore, in JP-A-H09-230111, since a plurality of objective lenses are integrally molded, for example, even when a commodity corresponding to one of the objective lenses is commercially available as a single product, the commodity cannot be utilized and This leads to a problem that the total cost of the optical pickup device increases

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