Patent ID: 7515364
Filing Date: 2009-04-07
Classification: G02B,G11B

Abstract:
1. An objective lens actuator comprising: a first objective lens which condenses a light beam on a recording surface of an optical recording medium; a second objective lens which is used interchangeably with the first objective lens to condense a light beam on the recording surface of the optical recording medium; a lens holder which has a first holding portion to hold the first objective lens and a second holding portion to hold the second objective lens; and a driving mechanism to move the lens holder at least in a focusing direction that is parallel to an optical axis of the objective lens and in a tracking direction that is parallel to a radial direction of the optical recording medium, wherein a first supporting portion to support the first objective lens is arranged on the first holding portion, a second supporting portion to support the second objective lens is arranged on the second holding portion, the first supporting portion is composed of two portions that are disposed oppositely in a first direction to sandwich an optical axis of the objective lens to be held by the first holding portion, and the second supporting portion is composed of two portions that are disposed oppositely in a second direction to sandwich an optical axis of the objective lens to be held by the second holding portion, and the second direction is perpendicular to the first direction.