Patent ID: 7492695
Filing Date: 2009-02-17
Classification: G11B

Abstract:
1. An optical pickup device constituted so that a laser beam emitted from a light receiving and emitting integral-type element is transmitted or reflected by a beam splitter, transformed to a parallel beam by a collimator lens, introduced into an objective lens, transmitted through the objective lens, and collected on a recording surface of an optical disc and the laser beam thus collected is returned to the light receiving and emitting integral-type element via a reverse path after the laser beam is reflected by the recording surface of the optical disc, wherein a front monitor light receiving element, which receives a part of direct light of the laser beam emitted from the light receiving and emitting element and detects a quantity of the received laser beam, is arranged between the light receiving and emitting integral-type element and the collimator lens, the front monitor light receiving element including a received-light-quantity increasing unit arranged to solely optically increase the quantity of the received laser beam, wherein the received-light-quantity increasing unit includes a substrate portion having inner and outer surfaces, a light receiving portion having a light receiving surface and fixed to the inner surface of the substrate portion, and a protruding resin mold portion that seals the light receiving portion with a transparent resin between the resin mold portion and the inner surface of the substrate portion, and wherein the received-light-quantity increasing unit is provided so that the inner surface of the substrate portion is inclined at a predetermined angle from a position approximately in parallel to an optical axis of the light receiving and emitting integral-type element toward the light receiving and emitting integral-type element and the light receiving surface of the light receiving portion is approximately in parallel to the inner surface of the substrate portion.