Optical pickup, optical disc drive device, and optical information device

1. An optical pickup comprising:

an objective lens for collecting an exit light from a light source on an information recording surface of an information recording medium;

a spherical aberration correction lens, having one surface formed to a larger curvature than the other surface, for correcting a spherical aberration of a light beam collected on the information recording surface by the objective lens;

a rising mirror for deflecting the exit light passed through the spherical aberration correction lens at a substantially right angle and guiding the exit light to an entrance surface of the objective lens;

a lens holder, configured thinner than a maximum thickness width of the spherical aberration correction lens, for holding the spherical aberration correction lens so that the surface of large curvature partially projects out with the surface of large curvature facing the rising mirror side;

a guide member extending in an optical axis direction of the spherical aberration correction lens, and having an end arranged to the side of a reflecting surface of the rising mirror;

a slidable part fixed to the lens holder while being projected to the rising mirror side and slidably moved along the guide member; and

a drive mechanism for driving the spherical aberration correction lens; wherein

the spherical aberration correction lens and the rising mirror are configured to be approachable until the projecting portion from the lens holder of the spherical aberration correction lens overlaps the reflecting surface of the rising mirror by having the projecting portion of the slidable part fitted within the side surface of the reflecting surface of the rising mirror when the spherical aberration correction lens approaches the rising mirror the most.

2. The optical pickup according to claim 1 , wherein the spherical aberration correction lens is a collimator lens for converting the exit light from the light source to a parallel light.

3. The optical pickup according to claim 1 , wherein the spherical aberration correction lens is arranged in a beam expander for converting a beam diameter of when the exit light from the light source enters the objective lens.

4. The optical pickup according to claim 2 , wherein the spherical aberration correction lens includes a color correction element.

5. The optical pickup according to claim 2 , wherein the spherical aberration correction lens is configured to a shape flat in a height direction.

6. The optical pickup according to claim 1 , wherein the guide member is configured by a pair of shafts arranged parallel to each other said pair of shafts including, only one shaft to which the slidable part fixed to the lens holder while being projected towards the rising mirror side engages extending to the side of the rising mirror.

7. The optical pickup according to claim 1 , wherein the guide member is configured by a pair of shafts arranged parallel to each other, a spring for biasing the lens holder towards the rising mirror side being further arranged on one of the shafts, and said one of the shafts engages with the slidable part fixed to the lens holder while being projected towards the rising mirror side.

8. The optical pickup according to claim 1 , wherein the drive mechanism is a stepping motor.

9. The optical pickup according to claim 1 , wherein the drive mechanism is an ultrasonic motor.

10. The optical pickup according to claim 1 , wherein the information recording medium includes two or more layers of information recording layer.

11. An optical disc drive device comprising the optical pickup according to claim 1 .

12. An optical information device comprising the optical disc drive of claim 11 .