Konica Minolta Opto, Inc.

Tsutomu Shimizu

Yuichi Atarashi

Kazuhiro Wada

Shogo Yamamoto

An object lens unit for an optical pickup device is disclosed. The object lens unit includes a first optical element facing an optical information recording medium; a second optical element positioned on a light source side of the first optical element; and a frame in which the first optical element and the second optical element are fixed. The frame includes a first fitting portion and a second fitting portion, and has a prescribed clearance in a perpendicular direction to the optical axis between at least one of the first fitting portion of the frame and the first optical element, and the second fitting portion of the frame and the second optical element to adjust a position of at least one of the first optical element and the second optical element in a perpendicular direction to the optical axis. An optical pickup device including such object lens unit is also disclosed.

Object lens unit and optical pickup device employing the unit

An object lens unit for an optical pickup comprising: a first optical element positioned facing an optical information recording medium; a second optical element positioned on a light source side of the first optical element; and a frame which has a first reference surface in contact with the first optical element to position the first optical element in an optical axis direction and a second reference surface in contact with the second optical element to position the second optical element in the optical axis direction so that the first optical element and the second optical element are fixed to be integrated with the frame, wherein the first optical element, the second optical element and the frame are attached, as a single optical component, to another member.

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Misato, Japan

Tsutomu Shimizu