Optical pick-up apparatus with lenses
There is provided an optical pick-up apparatus with a plurality of lenses, in which an actuator is carried to place a specific lens of a lens holder on an optical axis. In the optical pick-up apparatus, the actuator has the plurality of lenses to focus lasers with different wavelengths on a track of a disk according to the type of the disk, and a linear driving unit carries the actuator to place one of the lenses on a laser path.
1 . An optical pick-up apparatus, comprising:
an actuator having a plurality of lenses to focus lasers with different wavelengths on a track of a disk; and
a linear driving unit carrying all the actuator to place one of the lenses on a laser path.
2 . The optical pick-up apparatus according to claim 1 , wherein the linear driving unit reciprocates the actuator along a linear path.
3 . The optical pick-up apparatus according to claim 1 , further comprising a controller controlling the movement of the actuator to align a proper lens of the lenses with the track of the disk in accordance with the type of the disk.
4 . The optical pick-up apparatus according to claim 1 , wherein the actuator is carried the same distance as the distance between the lenses.
5 . The optical pick-up apparatus according to claim 1 , wherein the actuator comprises:
a lens holder holding the lenses;
a magnetic circuit provided with a coil, a magnet, and a yoke that are arranged around the lens holder;
a plurality of wire suspensions for supporting the lens holder; and
a frame spaced apart from the lens holder to support the wire suspensions, the frame being coupled with the yoke.
6 . The optical pick-up apparatus according to claim 5 , wherein the linear driving unit is coupled to a predetermined side of the frame.
7 . The optical pick-up apparatus according to claim 5 , wherein the yoke comprises a yoke plate and a vertical part extended from the yoke plate, and the linear driving unit is coupled to a predetermined portion of the vertical part or the yoke plate.
8 . The optical pick-up apparatus according to claim 5 , wherein the lenses are arranged in a line perpendicular to a tracking direction of the lens holder, the lenses being spaced apart from each other.
9 . The optical pick-up apparatus according to claim 5 , wherein the lenses are arranged at an angle of 180 degrees to each other.
10 . The optical pick-up apparatus according to claim 5 , wherein the lenses comprise a red laser lens and a blue laser lens.
11 . The optical pick-up apparatus according to claim 10 , wherein the red laser lens is an object lens for a compact disk (CD) and a digital video/versatile disk (DVD).
12 . The optical pick-up apparatus according to claim 10 , wherein the blue laser lens is an object lens for a blue laser disk (BD).
13 . The optical pick-up apparatus according to claim 1 , wherein the linear driving unit comprises a piezoelectric motor to carry the actuator.
14 . The optical pick-up apparatus according to claim 13 , wherein the piezoelectric motor is a motor selected from the group consisting of a surface wave type piezoelectric motor, a progressive wave type piezoelectric motor, a dual mode tuning piece type piezoelectric motor, and a multi-mode piezoelectric disk type piezoelectric motor.
15 . An optical pick-up apparatus, comprising:
a lens holder having a plurality of lenses to focus lasers with different wavelengths on a track of a disk;
a frame located a predetermined distance from the lens holder;
a plurality of wire suspensions connected between the lens holder and the frame; and
a linear driving unit carrying the lens holder and the frame along a linear path to place one of the lenses on an optical axis in accordance with the type of the disk.
16 . The optical pick-up apparatus according to claim 15 , wherein the lens holder is carried the same distance as the distance between the lenses.
17 . The optical pick-up apparatus according to claim 15 , wherein the lenses comprises:
a red laser lens for focusing a red laser beam on a CD/DVD; and
a blue laser lens for focusing a blue laser on a BD.
18 . The optical pick-up apparatus according to claim 15 , further comprising:
a focusing coil and a tracking coil that are fixed to predetermined sides of the lens holder;
a magnet facing with the focusing coil and the tracking coil; and
a yoke bent from a yoke plate to support the magnet and the frame.
19 . The optical pick-up apparatus according to claim 15 , wherein the linear driving unit is a piezoelectric motor disposed at a predetermined side of the frame.
20 . An optical pick-up apparatus, comprising:
an actuator having a lens holder on which a red laser lens and a blue laser lens are closely arranged in a line; and
a linear driving unit coupled with the actuator to carry the actuator along a linear path to place the red laser lens or the blue laser lens on an optical axis.