KR100284692B1 - Optical pickup device - Google Patents

Abstract

An optical pickup apparatus is disclosed. The disclosed optical pickup apparatus includes a laser light source, an objective lens on an optical path for focusing a laser beam from the light source on a disk, and recording and reproducing data, an actuator provided with the objective lens and moving the objective lens; The holder plate is coupled to the lower portion of the actuator and the objective lens mounted on the holder plate is bonded so that the holder plate is fixed at the position where the skew is adjusted by the actuator. A fixed plate having an arm stopper is provided at a position corresponding to the arm, and the gap between the yoke and the bobbin of the actuator is small, which has the advantage of eliminating the defect that the actuator contacts the yoke and the magnet while driving.

Description

Optical pickup device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus, and more particularly, to an optical pickup apparatus which is an improvement on an apparatus for adjusting an objective lens for focusing a laser on a disc.

In general, an optical recording / reproducing apparatus using an optical disk such as a compact disk player (CDP / Compact Disk Player) serves to detect a laser beam reflected from the disk by converting the laser light onto the disk and converting the laser beam into an electrical signal. An optical pickup device is included.

In order to reproduce an accurate signal with the optical pickup apparatus, the laser beam should be focused on the optical disk. For this purpose, driving an objective lens of an actuator is called focusing. Driving an objective lens to accurately scan on a track formed on the optical disc is called tracking. Accordingly, an optical pickup device is provided with an actuator and a magnetic circuit for driving the objective lens and performing the focusing and tracking operations.

1 to 2 show a configuration of a conventional optical pickup device.

Referring to the drawings, a conventional optical pickup device includes an actuator (14) for mounting an objective lens (12) and the objective lens (12) and performing focusing and tracking motions, and the actuator ( 14 is a holder plate (16) and a holder plate (16) having a holder arm (16a) formed by coupling the holder (13) and the holder (13) supporting the bottom and the holder plate (16). In combination, a yoke 15a is formed to drive the actuator 14 to form a magnetic circuit so that skew adjustment is possible, and a magnet 17 is formed on the yoke 15a. It includes a fixing plate 15 is provided attached.

In addition, the bobbin 11 is supported by a suspender 19 having flexibility and elasticity to a holder 13 fixed to the holder plate 16. Although not shown separately, the bobbin 11 is provided with a focusing coil and a tracking coil, which interact with a magnetic field formed by a magnet 17 fixed to the holder plate 16 and an inner and outer yoke 15a. Therefore, the actuator 14 including the bobbin 11 is moved in the X-axis direction to the Y-axis direction.

In the conventional optical pickup device, the yoke 15a and the magnet 17 are fixed and moved up and down or left and right while the bobbin 11 of the actuator 14 is supported by the suspender 19 having elastic force. In the process of adjusting the gap, the gap (gap) of the yoke (15a) and the bobbin (11) of the actuator 14 is reduced, the phenomenon in which the actuator 14 is in contact with the yoke (15a) during operation. easy. If such a phenomenon is found after assembly and treated as defective, there is a problem that repair is difficult.

In addition, as high speed recording and reproducing apparatuses are developed one after another, it is advantageous to reduce the gap between the yoke 15a and the bobbin 11 for the high speed recording and reproducing apparatus.

The conventional optical pickup apparatus having the above structure is operated and adjusted as follows.

First, in order to focus the optical pickup device vertically on the disk, the actuator 14 equipped with the objective lens 12 is slightly moved in the tracking direction and the magnet 17 direction or the angle is changed (the θ direction). Move) Adjust the skew.

After the holder 13 is fixed to the holder plate 16 for adjusting the skew, the angle of the objective lens 12 and the disc is adjusted by moving the holder plate 16 in the θ direction, the tracking direction, and the magnet 17 direction. The holder plate 16 and the yoke 15a are soldered and fixed.

The present invention has been made to solve the above problems, and provides an optical pickup apparatus which prevents interference between the actuator, the yoke and the magnet in the skew process of moving the objective lens so that the focus of the optical pickup is perpendicular to the disk. Its purpose is to.

1 is a perspective view schematically showing a conventional optical pickup device.

Figure 2 is an exploded perspective view schematically showing a conventional optical pickup device.

3 is a perspective view schematically showing the optical pickup device according to the present invention.

Figure 4 is an exploded perspective view schematically showing the optical pickup device according to the present invention.

<Description of the reference numerals for the main parts of the drawings>

11 Bobbin 12 Objective Lens

14 ... Actuator 13 ... Holder

16a, 25a ... Holder Arm 16, 25 ... Holder Plate

15, 27 ... fixed plate 15a, 25b ... Yoke

15b, 27a ... Arm Stopper 17 ... Magnet

19.Suspender

In order to achieve the above object, the optical pickup apparatus of the present invention comprises a laser light source, an objective lens on an optical path to focus and record a data by reproducing a laser beam from the light source on a disk, An actuator which is installed and moves the objective lens, a holder plate having a holder arm formed by being coupled to a lower portion of the actuator, and the objective lens mounted on the holder plate at which the skew is adjusted by the actuator. The plate is bonded to be fixed, characterized in that the fixing plate provided with an arm stopper is provided at a position corresponding to the holder arm.

In addition, the actuator includes a non-magnetic bobbin, a plurality of suspenders connecting the bobbin to a holder, and a magnetic circuit for focusing and tracking movement of the objective lens so as to focus on the disk perpendicularly to the disk. It is preferable to further provide. The magnetic circuit may include a focusing coil installed on one side of the bobbin to form an energization path for current for focusing, a tracking coil installed on the other side of the bobbin to form an energized path for current for tracking, and the respective coils. It is provided with a plurality of magnets which are installed on the holder plate so as to face each other with a gap therebetween to form a magnetic field in a direction perpendicular to the direction of current flow of the current, and the horseshoe-shaped yoke attached so that the magnets are spaced apart from each other. desirable.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals as in the above-described drawings indicate the same components.

3 to 4 illustrate an optical pickup apparatus according to an embodiment of the present invention. Referring to the drawings, the optical pickup apparatus of the present invention collects a laser light source (not shown) and an objective lens on an optical path to focus and record a laser beam from the light source on a disk (not shown) to record and reproduce data. And (12).

In addition, the objective lens 12 is installed on the actuator 14, and the holder plate (25) in which a holder arm (25a) is formed is coupled to the lower portion of the actuator (14). The objective lens 12 mounted on the lower end of the holder plate 25 is bonded to the holder arm 25a at a position where the skew is adjusted by the actuator. A fixing plate 27 having an arm stopper 27a formed at a corresponding position is provided.

In addition, the actuator is a non-magnetic bobbin (11), a plurality of suspenders (19) for connecting the bobbin 11 and the holder 13, and the bobbin (11) is installed in the vertically focused on the disk A magnetic circuit is provided for focusing and tracking movement of the objective lens 12 in the "Z" direction so as to be formed.

The magnetic circuit is provided on one side of the bobbin 11 and the focusing coil to form an energization path of the current for focusing and the tracking coil is installed on the other side of the bobbin 11 to constitute the current passing path for tracking and The plurality of magnets 17 and the magnets 17 which are installed on the holder plate 25 so as to face each other with the respective coils interposed therebetween to form a magnetic field in a direction perpendicular to the direction in which the current is supplied, are spaced apart from each other. A horseshoe-shaped yoke 25b is provided to be opposed to each other. The actuator 14 includes an optical detector (not shown) for detecting light reflected from the disk, and an optical element (not shown) provided between the objective lens 12 and the laser light source.

The optical pickup apparatus according to the present invention having the above structure is operated as follows.

First, the holder 13 of the actuator 14 on which the objective lens 12 is mounted is fixed to the yoke 25b. At this time, the focusing position of the disk and the objective lens 12 is not perpendicular due to the assembly error of the actuator 14. Therefore, to move the objective lens 12 so that the focal point of the objective lens 12 of the optical pickup device is perpendicular to the disk, the actuator 14 on which the objective lens 12 is mounted is X, Y and θx, θy. You need to move in the direction.

When the focal point of the objective lens 12 of the optical pickup device is perpendicular to the disk, jitter, which is a measure of a radio frequency (RF) signal, becomes the best.

Therefore, in the present invention, this operation is performed by adjusting the yoke 25b in the X, Y and? After that, the yoke 25b is soldered and fixed to the fixing plate 27.

In the conventional optical pickup apparatus, the actuator 14 and the yoke 25b are separated, and the actuator 14 is moved in the X, Y, and θx and θy directions so that the yoke 25b and the actuator 14 when the actuator 14 is driven. Although there is room for interference between the elements), in the present invention, the magnetic circuit including the yoke 25b and the actuator 14 are integrally moved to eliminate the possibility of such interference.

The optical pickup device according to the present invention has a small gap between the yoke and the bobbin of the actuator and has an effect of eliminating the defect that the yoke and the magnet are in contact with the actuator while driving.

The present invention has been described with reference to one embodiment shown in the accompanying drawings, which is illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible. . Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (5)

A laser light source; An objective lens on the optical path for focusing the laser beam from the light source onto a disc to record and reproduce data; An actuator for installing the objective lens and moving the objective lens; A holder plate coupled to a lower portion of the actuator, the holder plate having a holder arm formed thereon; And A fixed plate having an arm stopper formed at a position corresponding to the holder arm, wherein the objective lens mounted on the holder plate is bonded to fix the holder plate at a position where skew is adjusted by the actuator; Optical pickup device characterized in that the provided. The method of claim 1, The actuator includes a bobbin made of nonmagnetic material; A plurality of suspenders connecting the bobbin to a holder; And a magnetic circuit installed in the bobbin and having a focusing motion and a tracking motion for moving the objective lens so as to focus on the disk vertically. The method of claim 2, The magnetic circuit includes a focusing coil installed at one side of the bobbin to form an energization path of current for focusing; A tracking coil installed on the other side of the bobbin to form an energization path for current for tracking; A plurality of magnets installed on the holder plate to face each other with the respective coils interposed therebetween, the magnets forming a magnetic field in a direction perpendicular to a direction in which the current is applied, and a horseshoe-shaped yoke attached such that the magnets are spaced apart from each other; Optical pickup device comprising a. The method of claim 1, The actuator includes a photodetector for detecting light reflected from the disk; An optical element provided between the objective lens and the laser light source; Optical pickup device comprising a. The method according to claim 3 or 4, And said actuator and said magnetic circuit move integrally.