KR19980083591A - Optical pickup device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus for reproducing the recorded contents of a disc. More specifically, the hologram element and the reflection mirror are integrally integrated into an actuator moving in the optical axis and the radial direction when the power is applied to equip an objective lens to detect a track of the disc. The present invention relates to an optical pickup apparatus which can reduce the tilt deformation of the laser light focused and configured, reduce the amount of jitter, and improve the precision and performance of the optical pickup apparatus while reducing the manufacturing cost due to the low number of components.

The present invention is provided with an actuator having a reflective mirror mounted thereon at a boundary between the horizontal through hole on which the hologram element is mounted and the vertical through hole on which the objective lens is mounted, and equipped with an reflective mirror, and one end of the leaf spring member is connected to both sides thereof. An actuating portion having a coil PCB, a focusing coil connected to each end of the coil PCB, and a tracking coil wound a plurality of times, and having a protrusion having a fitting hole opened downwardly on the lower surface of the actuator; and the other end of the leaf spring member. A base unit having a fixed vertical yoke and a shaft inserted into the fitting hole of the protruding portion integrally formed at an upper surface thereof, having a pickup base having a plurality of guide holes, and having magnetic bodies at both sides of the shaft to generate a magnetic field; It provides an optical pickup device comprising.

Description

Optical pickup device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus for reproducing the recorded contents of a disc. More specifically, the hologram element and the reflection mirror are integrally integrated with an actuator moving in the optical axis and the radial direction when the power is applied so that an objective lens is provided to detect the track of the disc. The present invention relates to an optical pickup apparatus that can reduce the manufacturing cost by reducing the tilt deformation of the laser beam focused and focused, and improving the precision and performance of the optical pickup apparatus by reducing the amount of jitter.

In general, optical pickup devices mainly employed in optical disk players such as Mini Disk Player, Compact Disk Player, and Laser Disk Player are used to track the tracks desired by the user on a disk, which is an optical recording medium. After detecting the position and injecting the laser light irradiated with the pit recorded on the disk surface of the detected track position, the reflected light reflected back through the optical system is detected and converted into an electrical signal to record the recorded content on the disk surface. It is a device mounted vertically below the disk to play.

As shown in FIG. 1, the conventional optical pickup apparatus 100 includes an actuator 110 having an objective lens 11 and a pickup base 120 installed on the upper surface as a plurality of screw members 119. And a flexible printed circuit board (PCB) (not shown) for supplying external power to the actuator 110. The actuator 110 includes an objective lens for focusing a focus on a pit surface of a disk. 111 is equipped with a bobbin 112 is mounted, around the bobbin 112 is wound around the focusing coil (Focusing Coil) (112a) to enable movement in the optical axis direction when the power is applied, the focusing coil (112a) On both sides of the plate 113 winding the tracking coil (Tracking Coil) (112b) to enable movement in the radial direction when the power is applied to the pick-up base 120 and a plurality of screw members 119 are connected to the plate 113 It is mounted on the top of the.

In addition, both sides of the bobbin 112 are provided with a coil PCB 114 connected to each end of the coil members 112a and 112b, and a servo system transmits input and output signals to the coil PCB 114. While connecting one end of the suspension wire (hereinafter referred to as a wire) 116 to attenuate the vibration of the bobbin 112, the other end of the second yoke 117 of the plate 113 And a pair of inner yokes 118 fitted to the gel holder 115 filled with the damping gel and interposed without interference between both sides of the bobbin 112 and the winding focusing coil 112a. In addition to the second yoke 117 is provided on the upper surface of the plate 117, the inner surface of the outer yoke 118a which is installed to face each other in the direction of focusing and tracking when the power is applied to the coil members 112a and 112b. Magnetic body 118b for forming a magnetic field to allow movement of The.

The conventional optical pickup apparatus 100 having such a configuration includes a hologram element 122 for irradiating a laser light to a pit surface of a disk and a pickup base having a reflection mirror 123 at an adhesive portion 121 so as to bend the upper portion thereof. Since the actuator 110, which is movable in the optical axis and the radial direction, is assembled on the upper surface of the 120, the number of components to be assembled is large, and the assembly structure is very complicated, which makes it difficult to improve the work productivity and is fixed. The laser beam, which is refracted by the reflection mirror 121 of the pickup base 120 and focused on the pit surface of the disk, passes through the objective lens 111 mounted on the bobbin 112 which is free to move when the power is applied. It is difficult to match the x- and y-axis balance of the light, and thus, there is a problem in that the amount of jitter is increased, thereby degrading the performance of the optical pickup apparatus 100.

Accordingly, the present invention has been made to solve the above problems, the object of which is to provide a hologram element, a reflecting mirror and an objective lens integrally to move when the power is applied to reduce the number of components to improve the assembly workability An optical pickup apparatus which is composed of an actuator and a pickup base having a magnetic body on the lower side thereof to reproduce the contents of the disk pit surface.

1 is an exploded perspective view showing an optical pickup device according to the prior art,

2 is an exploded perspective view showing an optical pickup apparatus according to the present invention;

Figure 3 is a longitudinal sectional view showing an optical pickup apparatus according to the present invention.

* Explanation of symbols for main parts of drawings *

1 ..... Optical pickup device 10 ..... operating part

11 ... Actuator 12 ..... Hologram element

12a ..... Horizontal through hole 13 ..... Objective lens

13a ..... Vertical through hole 14 ..... coil PCB

15 ..... leaf spring member 16 ..... protrusion

16a ..... Fitting Ball 17 ..... Focusing Coil

18 ..... Tracking Coil 19 ..... Reflective Mirror

19a ..... Bonding 20 ..... Base

21 ..... pickup base 22 .... magnetic material

23 ..... Shaft 24 ..... Vertical yoke

25 ..... Guide hole

In order to achieve the above object, the present invention provides an apparatus for reproducing recorded contents by detecting reflected light reflected through an optical system after injecting a laser beam into a pit of a disk which is an optical recording medium, converting it into an electrical signal. In this case, the inclined adhesive portion is formed at a predetermined angle at the boundary between the horizontal through hole on which the hologram element is mounted and the vertical through hole on which the objective lens is mounted, and the actuator is equipped with a reflective mirror thereon, and one end of the leaf spring member is connected to both sides of the actuator. While the coil PCB is provided, the focusing and tracking coils each of which are connected to the coil PCB are wound a plurality of times, and a projection having a fitting hole opened downward is provided on the lower surface of the actuator to move in the optical axis and radial directions when the power is applied. And a vertical yoke and the protrusion at which the other end of the leaf spring member is fixed. The base is formed integrally with the upper surface of the shaft is inserted into the insertion hole, the base having a pickup base having a plurality of guide holes, and having a magnetic material on both sides of the shaft to generate a magnetic field; optical pickup comprising a By providing a device.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the optical pickup device according to the present invention.

2 is an exploded perspective view showing an optical pickup apparatus according to the present invention, Figure 3 is a longitudinal sectional view showing an optical pickup apparatus according to the present invention.

As shown in FIGS. 2 and 3, the optical pickup device 1 according to the present invention focuses a hologram element 12 for generating a laser light, a reflection mirror 19 for refracting the laser light at a predetermined angle, and a laser light. An actuator 11 having the objective lens 13 integrally and a pickup base 21 equipped with a magnetic material 22 to move in the optical axis and radial directions when the power is applied, directly below the disk to reproduce the recording of the disc. As the device to be installed in, such a device (1) is composed of an operating unit 10 and the base unit 20.

That is, the operating unit 10 capable of free movement in the optical axis and the radial direction when the power is applied is integrally provided with the hologram element 12, the reflection mirror 19 and the objective lens 13 on the path through which the laser light passes. One actuator 21 is provided. The actuator 21 penetrates in a horizontal direction a horizontal through hole 12a in which the hologram element 12 is mounted on its body, and communicates with the upper end of the actuator 21. The vertical through-hole 13a to which the objective lens 13 is mounted is formed through. In addition, at a boundary portion where the horizontal through hole 12a and the vertical through hole 13a meet each other, an adhesive portion 19a inclined at an angle of 45 ° is preferably formed so that the laser light can be refracted by 90 ° with respect to the traveling direction. This is equipped with a reflection mirror (19).

In addition, both sides of the actuator 11 is provided with a coil PCB (14) to the plate spring member made of a thin thickness so as to be fixed above the pick-up base (21) to be described later without interference while attenuating the vibration during the external impact The coupling coil 18 is connected to one end, and the tracking coil 18 is wound on the lower surface of the actuator so that the focusing coil 17 can be wound a plurality of times so as to move in the optical axis direction and move in the radial direction. Windings a plurality of times, each end of the coil members 17 and 18 wound thereon, having a projection 16 having a fitting hole 16a into which a shaft 23, which will be described later, is opened to be inserted. Is connected to the coil PCB (14).

In addition, the base portion 20, which is provided directly under the actuator 11 and generates a magnetic field when the power is applied, is provided with a plurality of guide holes 25 formed in the body to allow sliding movement for detecting a track of the disk. A base 21 is provided, and the upper surface of the pickup base 21 includes a plurality of vertical yokes 24 to which the other ends of the leaf spring members 15 are fixed, and fitting holes 16a of the protrusions 16. ) Is formed integrally with the shaft 23 is inserted without interference. At this time, each end of the leaf spring member 15 is connected to the vertical yoke 24 as a small amount of gel so as to attenuate its own vibration and external impact according to the movement of the actuator 11, and to a very thin thickness. It is preferred to be configured.

And, both sides of the shaft 23 having an outer diameter size smaller than the inner diameter size of the fitting hole (16a) having a magnetic force to form a magnetic field of a constant size with the coil members 17, 18 supplied with power Each of the plurality of magnetic bodies 22 is provided. At this time, it is preferable to set the distance between the inserted shaft 23 and the fitting hole 16a to be somewhat larger than the maximum moving distance of the actuator 11 moving in the same direction so that interference does not occur when moving in the radial direction.

When the optical pickup device 1 having the above-described configuration is employed in the optical disc player to detect the track position of the disc and reproduce the recording of the pit surface, the pickup base 21 having the plurality of guide holes 25 is provided. ), And transfer the objective lens 13 of the actuator 11 installed above it to the lower part of the track of the disk to be detected, and then supply the external power through the coil PCB 14 to each coil member 17, ( 18, the coil member 17, to which power is applied, is located between the plurality of magnetic bodies 22 that the protrusions 16 winding the coil members 17 and 18 a plurality of times face each other. The actuator 11 can be moved in the optical axis direction or in the radial direction as in the prior art by a magnetic field of a predetermined magnitude formed between the magnetic field 18 and the magnetic body 22. At this time, the shaft 23 integrally formed with the pickup base 21 made of a metal material is inserted without interference into the fitting hole 16a of the protrusion 16 winding the coil members 17 and 18. Since the magnetic field generated in the vicinity of the outer circumference of the protruding portion 16 is larger than the conventional one, the movement of the actuator 11 in the optical axis and the radial direction can be reliably ensured.

On the other hand, between the coil PCB 14 of the actuator 11 and the vertical yoke 24 of the pickup base 21 so as to attenuate the vibration and external impact due to the movement of the actuator 11 operated as described above. Instead of installing the gel holder 115 filled with the damping gel as in the related art, the vertical yoke 24 is connected with the gel and is formed by mounting a very thin plate spring member 15. It is possible to simplify the assembly structure and improve the assembly workability by reducing the number of assembly parts of the pickup device (1).

Subsequently, the laser light emitted from the hologram element 12 mounted on the horizontal through hole 12a of the actuator 11 is refracted at a predetermined angle by the reflection mirror 19 mounted on the adhesive portion 19a inclined at a predetermined angle. The laser light incident on the objective lens 13 side mounted on the upper end of the vertical through hole 13a communicating with the horizontal through hole 12a is focused on the pit surface of the disc. At the same time, the reflected light reflected by the objective lens 13 and the reflecting mirror 19, which are opposite paths thereof, is focused on the optical system, and converted into an electrical signal to reproduce the recorded contents of the disk.

In this case, the actuator 11 moves through the horizontal through hole 12a and the vertical through hole 13a so as to pass through the laser beam without interference, and moves in the optical axis and the radial direction to detect the track of the disc when the power is applied. By integrating the hologram element 12, the reflecting mirror 19 and the objective lens 13 integrally, the laser beam irradiated from the hologram element 12 passes through the reflecting mirror 19 without tilting the x and y axes. Since it is always irradiated to a constant focusing position of the objective lens 13, the amount of jitter generated in the optical pickup device 1 can be significantly reduced to further improve accuracy and performance.

According to the optical pick-up apparatus 1 according to the present invention as described above, the coil member (17), 18 is wound around the projecting portion 16 so as to move in the optical axis, radial direction when the power is applied to the lower surface and And the actuator 11 having the coil PCB 14 connected to the leaf spring member 15 which can attenuate external shock and vibration on both sides thereof, and the hologram element 12 and the reflection mirror 19 on the body. In order to install the lens 13 integrally, the horizontal and vertical through holes 12a and 13a are provided in communication with each other, and the pickup base 21 having the magnetic body 22 and the shaft 23 mounted on the upper surface, respectively, is provided. In this case, the number of components of the optical pickup device 1 for reproducing the recorded contents of the disc is smaller than before, so that the assembly work can be simplified and the manufacturing cost can be reduced, while the laser beam irradiated from the hologram element 12 Mounted in the conventional bobbin 112, which is frequently moved in position as in this conventional Since the focus is not focused on the objective lens 111 but focused on the objective lens 13 integrally mounted with the hologram element 12 and the reflection mirror 19, the amount of jitter can be significantly reduced, so that the performance of the optical pickup device and An effect that can improve the accuracy is obtained.

Claims (4)

In the apparatus for detecting the reflected light reflected back through the optical system after injecting the laser light into the pit of the disk which is an optical recording medium, converting it into an electrical signal and reproducing the recording contents, the hologram element 12 is mounted. An actuator 11 having a reflecting mirror 19 formed thereon is formed by forming an adhesive portion 19a inclined at an angle to the boundary between the horizontal through hole 12a and the vertical through hole 13a on which the objective lens 13 is mounted. On both sides of the actuator 11, the coil PCB 14 having one end of the leaf spring member 15 is connected, and the focusing, tracking coils 17, 18 connected to each end of the coil PCB 14 are provided. A) a plurality of windings, and having a projection 16 formed with a fitting hole 16a open to the lower portion on the lower surface of the actuator 11, an operation unit 10 moving in an optical axis and radial direction when power is applied; and A vertical yoke 24 to which the other end of the leaf spring member 15 is fixed and a shaft 23 inserted into the fitting hole 16a of the protrusion 16 are integrally formed on an upper surface thereof, and a plurality of guide holes And a base portion (20) having a pickup base (21) having a 25) and a magnetic body (22) on both sides of the shaft (23) to generate a magnetic field. The fitting hole of claim 1, wherein the shaft 23 has a gap between the fitting hole 16a fitted with the outer diameter of the shaft 23 and is set somewhat larger than the maximum moving distance of the actuator 11 moving in the radial direction. Optical pickup device characterized in that the configuration is smaller than the size of the inner diameter of 16a). According to claim 1, The leaf spring member 15 is connected to the vertical yoke 24 and one end as a fine amount of gel, so that the vibration and the external shock according to the movement of the actuator 11 can be attenuated, Optical pickup device, characterized in that composed of a very thin thickness. According to claim 1, wherein the bonding portion (19a) is preferably provided with an angle of inclination of 45 ° inclined at a predetermined angle so as to be able to bend 90 ° with respect to the advancing direction laser beam is provided with a reflective mirror 19 on the upper surface Optical pickup device characterized in that.