Patent ID: 7301713
Filing Date: 2007-11-27
Classification: G02B,G11B

Abstract:
1. 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; wherein the frame comprises a first fitting portion and a second fitting portion in which the first optical element and the second optical element are respectively fitted, to determine relative positions of the first optical element and the second optical element to each other in a perpendicular direction to the optical axis, and wherein the frame has a prescribed clearance in a perpendicular direction to the optical axis in at least one of the first fitting portion and the second fitting portion 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 and the at least one of the first optical element and the second optical element having the prescribed clearance is fixed with an adhesive.