| 摘要 |
A disclosed lens actuator includes:
an objective lens (2) condensing a light beam on an optical storage medium; a diffractive element (3) providing compatibility with plural types of optical storage media relative to light sources of plural different wavelengths; and a lens holder (1) including the objective lens (2) and diffractive element (3) in an opposing manner. The objective lens (2) is driven with the lens holder (1) in at least focusing and tracking directions relative to the optical storage medium. At least three protrusions (11) are set on the lens holder (1) in directions orthogonal to an optical axis of the objective lens (2). The protrusions (11) are in contact with at least one of circumferential surfaces of the objective lens (2) and the diffractive element (3) and position the objective lens (2) or the diffractive element (3). An end surface of the protrusion (11) in contact with the circumferential surface of the objective lens (2) or the diffractive element (3) has a plane surface.
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