Patent ID: 6369963
Filing Date: 2002-04-09
Classification: G02B,G11B

Abstract:
An optical pickup apparatus having an objective lens, a lens holder that mounts the objective lens, a main frame holding the lens holder, and an inclination angle adjusting mechanism for adjusting an angle of inclination of the objective lens, the apparatus comprising:a main shaft guide frame mounted on one side of the main frame, the main shaft guide frame defining at least one main shaft guide aperture; a main shaft for guiding the objective lens in a radial direction of an optical disc, the main shaft passing through the at least one main shaft guide aperture; an auxiliary shaft guide frame mounted on another side of the main frame, the auxiliary shaft guide frame having an auxiliary shaft guide groove; and an auxiliary shaft passing through the auxiliary shaft guide groove and adapted to allow the objective lens to slidably move thereon in parallel with the main shaft; the inclination angle adjusting mechanism having a first inclination angle adjusting mechanism for tilting the objective lens about a first axis that passes through a center of the auxiliary shaft guide groove and extends in a direction perpendicular to the direction in which the objective lens shifts in the radial direction of the optical disc, and a second inclination angle adjusting mechanism for tilting the objective lens about a second axis that concurs with a central axis of the main shaft; the first inclination angle adjusting mechanism having a first bearing shaft for rotatably supporting the main shaft guide frame about the first axis with respect to the main frame, and a first inclination angle adjusting screw that fixes the main shaft guide frame about the first bearing shaft at a predetermined inclined position; and the second inclination angle adjusting mechanism has a second bearing shaft for rotatably supporting the auxiliary shaft guide frame with respect to the main frame about a third axis extending in parallel with the second axis, and a second inclination angle adjusting screw that fixes the auxiliary shaft guide frame about the second bearing shaft at a predetermined inclined position.