Patent ID: 8087038

Claim:
An optical pickup comprising: an optical unit which has a lens member having an optical axis, the optical axis of the lens member being offset to one side from a center of the optical unit; and an optical pickup case which holds the optical unit from both sides, wherein a first end of the optical unit is bonded to the optical pickup case with a first adhesive, a second end of the optical unit is bonded to the optical pickup case with a second adhesive, the optical unit has a first portion ranging from the optical axis of the lens member to the first end of the optical unit and a second portion ranging from the optical axis of the lens member to the second end of the optical unit, a thermal expansion amount of the optical unit as caused by a change in ambient temperature, is absorbed by a compression amount of the first adhesive and a compression amount of the second adhesive such that the optical axis of the lens member is not displaced when the optical unit is thermally expanded, wherein the compression amount of the first adhesive is smaller than the compression amount of the second adhesive if the thermal expansion amount of the first portion is smaller than the thermal expansion amount of the second portion, and wherein a recess is provided in an attaching surface of the optical pickup case corresponding to the second end of the optical unit if the thermal expansion amount of the first portion is smaller than the thermal expansion amount of the second portion.