Patent ID: 7468849
Filing Date: 2008-12-23
Classification: G02B,G11B

Abstract:
1. An object lens unit for an optical pickup device, 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 in which the first optical element and the second optical element are fixed, wherein the frame comprises a first fitting portion and a second fitting portion, wherein the frame 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 before fixing the first optical element and the second optical element to the frame, wherein at least a part of a non-optical surface of the at least one of the first optical element and the second optical element is protruded from the frame in a direction of the optical axis, and wherein a light flux emitted from a light source of the optical pickup device does not pass through the non-optical surface.