KR19990025418U - Actuator device for optical pickup - Google Patents

Abstract

The present invention allows the track coil and the focusing coil to be wound on both sides of the actuator in a separate state, thereby reducing the power consumption applied to the coils, and also placing the reflector reflecting the beam between these coils, thereby reducing the volume of the actuator. In particular, the present invention relates to an actuator device for optical pickup that can reduce the size of the optical pickup. In particular, in an actuator device for moving a lens in a track direction and a focusing direction, the actuator moves in both a focusing direction and a track direction on both sides of a bottom surface of the actuator. A pair of winding parts for winding a focusing coil and a track coil, respectively, is provided, and a yoke and a permanent magnet for generating magnetic flux toward the respective coils are provided on the outer surface of each of the winding parts, and beams are disposed between the respective winding parts. It is characterized by having a reflector for reflecting the light toward the lens All.

Description

Actuator device for optical pickup

The present invention relates to an actuator of an optical pickup, and more particularly, a focusing coil and a track coil are separately installed on both sides of the actuator, and a reflecting mirror is positioned between them, so that the reflecting mirror is positioned inside the actuator and scanned from the light source. The present invention relates to an actuator of an optical pickup that can be manufactured in a small size by reducing the height of the actuator as the beam is scanned to the side of the actuator.

In general, the optical pickup is installed in the compact disc player to read information on the disc. Such an optical pickup device is provided with an actuator 1 having a lens 2 that converges a beam and sends it toward the disc as shown in FIG. The actuator 1 is wound around the focusing coil 3 and the track coil 4 so as to finely move the lens 2 in the focusing direction, i.e., the up and down direction, and the track direction, the left and right direction. Peripheral magnets (5) and yoke (6) for generating electromagnetic force is provided around. In addition, the actuator 1 is supported in an elastically suspended state in the fixing portion constituting the optical pickup device. That is, it is supported by a conductive wire spring fitted in all directions of the fixing part. When power is applied to each coil 3 and 4 through each wire spring, the actuator 1 is moved in the focusing or track direction by the electromagnetic force, and the disk Information formed on the surface of is reproduced.

In the conventional optical pickup configured as described above, when a beam emitted from the light source is scanned toward the lens 2 along the scanning path, the lens 2 converges the beam and scans the surface of the disk, and information of the disk is reproduced in this process.

However, the conventional optical pickup is manufactured in a relatively heavy state because the focusing coil 3 is wound around its outer circumferential surface while the lens 2 is formed in the center of the actuator 1. Therefore, the rigidity of the wire spring for supporting the actuator 1 is increased, and the amount of current applied to the focusing coil 3 and the track coil 4 is increased to increase power consumption. In addition, since the reflector reflecting the beam emitted from the light source toward the lens 2 is positioned at a lower distance from the actuator 1, the volume of the entire optical pickup is increased, making it difficult to manufacture it compactly. .

The present invention has been made in view of the conventional problems, and an object of the present invention is to allow the track coil and the focusing coil to be wound on both sides of the actuator so that the power consumption applied to the coil is reduced and the By providing a reflector for reflecting the beam between them, to reduce the volume of the actuator to provide an actuator of the optical pickup that can be made small.

1 is a perspective view showing a conventional actuator device,

2 is a perspective view showing the actuator device of the present invention,

3 is a cross-sectional view of the actuator device of the present invention.

<Description of the symbols for the main parts of the drawings>

10: actuator 11: lens

12: focusing coil 13: track coil

14: winding unit 15: hole

16: York 17: External York

18: inner yoke 19: permanent magnet

20: reflector

In order to achieve the above object, the present invention provides an actuator device for moving a lens in a track direction and a focusing direction, wherein a focusing coil and a track coil for winding the actuator in a focusing direction and a track direction can be wound on both sides of the bottom of the actuator. A pair of winding parts is provided, and a yoke and a permanent magnet for generating magnetic flux toward each coil are provided on the outer surface of each of the winding parts, and a reflecting mirror is provided between the winding parts to reflect a beam toward the lens. There is a characteristic.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An actuator 10 is provided with a lens 11 that converges the beam and directs it towards the disc. The actuator 10 is composed of a rectangular parallelepiped, and a winding portion 14 capable of winding the focusing coil 12 and the track coil 13 on both sides of the lower surface of the lens 11 protrudes downward. And between each winding part 14, the reflector 20 which reflects a beam and scans toward the lens 11 is located. The focusing coil 12 and the track coil 13 serve to finely move the actuator 10 in the focusing direction, that is, the vertical direction and the track direction, that is, the left and right directions. In addition, each winding portion 14 of the actuator 10 is provided with a hollow hollow fitting portion 15 and generates magnetic flux by interaction with each of the coils 12 and 13 on the outside of the actuator 10. The yoke 16 is provided. The yoke 16 is divided into an outer yoke 17 corresponding to the outer surface of each winding portion 14 and an inner yoke 18 fitted into each hole 15, and the corresponding surface of each outer yoke 17 A permanent magnet 19 is provided.

The present invention configured as described above is provided with the winding portion 14 winding the focusing coil 12 and the track coil 13 on both sides of the bottom surface of the actuator 10 and the lens 11 at the center of the winding portion 14. ) Is provided. Also placed between each winding 14 is a reflector 20 for reflecting the beam towards the lens 11. In addition, a yoke 16 is provided to generate magnetic flux outside the actuator 10 so as to flow the actuator 10 in a horizontal or vertical direction. The yoke 16 is composed of the inner yoke 18 and the outer yoke 17, the outer yoke 17 is provided with a permanent magnet 19 for generating a magnetic flux.

Referring to the operating state of the actuator 10 is as follows. First, when power is applied through a wire spring (not shown) connected to each of the coils 12 and 13, the coils 12 and 13 are connected to the tracks by the interaction between the permanent magnets 19 and the yokes 16. Flow in the focusing direction. At this time, the lens 11 is moved finely along the surface of the disk, and when the beam emitted from the light source is scanned to the lens 11 through the reflector 20, the information of the disk is reproduced.

The present invention configured as described above is provided with a pair of winding parts spaced apart from each other at a lower portion of the actuator, and a winding coil and a focusing coil are wound around each winding portion, and permanent magnets and yokes for generating magnetic flux outside the coils are provided. Therefore, the power consumption is reduced by the amount of winding of each coil is reduced, and the reflector reflecting the beam toward the lens is located between each of the windings, thereby reducing the overall volume of the actuator, thereby making it possible to manufacture it compactly.

Claims (2)

In the actuator device for flowing the lens in the track direction and the focusing direction, On both sides of the bottom of the actuator is provided a pair of winding portions for winding the focusing coil and the track coil for flowing the actuator in the focusing direction and the track direction, respectively A yoke and a permanent magnet are provided on the outer surface of each of the winding parts to generate magnetic flux toward each coil, and a reflector for reflecting a beam toward the lens is provided between the winding parts. . According to claim 1, wherein each of the winding portion is provided with a fitting portion penetrated through the inside, the yoke is characterized in that separated into an inner yoke fitted to each of the fitting portion and the outer yoke corresponding to the outside of the respective winding portion Actuator device for optical pickup.