KR0175811B1 - An object lens auto inserting device of optical pick up actuators - Google Patents

Abstract

The present invention relates to a base plate of an optical pickup actuator and includes an objective lens holder 102 on which an objective lens 130 is seated on an upper surface of the objective lens holder 102 and an objective lens holder 103 for moving the objective lens holder 102 in a focusing adjustment direction An optical pick-up actuator (120) comprising: an optical pick-up support member (110) in which a bottom surface of a yoke plate (104) of the optical pick- The lens 130 is moved upward and downward while being press-fitted into the bottom surface to push the objective lens 130 into the objective lens holder 102 of the optical pickup actuator 100 supported by the optical pickup support member 110 And an upper and a lower movable member (120) for fixing the objective lens. The objective lens automatic press-fitting device of the optical pickup actuator is characterized in that the objective lens is automatically and quickly assembled to the objective hole of the objective lens holder Inventions will have the effect of improving the assembly performance and productivity of the pickup actuator.

Description

Objective lens automatic push-in device of optical pick-up actuator

Figure 1 is an exploded perspective view of a typical wire type actuator.

FIG. 2 is a perspective view of a combined state of a general wire type actuator. FIG.

FIG. 3 is an external perspective view of the automatic lens-press fitting apparatus according to the present invention;

FIG. 4 is a cross-sectional view showing a principal part of an automatic lens-press apparatus for an objective lens according to the present invention;

FIG. 5 is a sectional view of the automatic lens-press apparatus according to the present invention in an operating state; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

50: Support jig 60: Support

70: Shift gear portion 80:

90: Up and down moving shaft 110: Optical pickup supporting member

120: Up and down moving member

In particular, the present invention relates to an objective lens incorporated in an objective lens holder of an optical pickup actuator. More particularly, the present invention relates to an objective lens to which an objective lens holder is fixed, When the objective lens is fixed to the fixing jig fixed to the bottom portion of the moving body and the rotating lever is rotated by hand, the objective lens is pressed and fixed to the objective hole of the objective lens holder while the up and down moving bodies move up and down, To an apparatus for automatically pressing an objective lens of an optical pickup actuator to improve the assembling performance and productivity of the optical pickup actuator by quickly and accurately fixing the lens.

Generally, the optical pickup actuator is provided at the lower portion of the disc, which is an optical recording medium of various optical disc players such as a mini disc player (MDP), a compact disc player (CDP) and a laser disc player (LDP) A desired track position on the disc is detected while moving, laser light is incident on the pit recorded on the disc surface at the detected track position, the reflected light is detected through the optical system, and the reflected light thus detected is converted into a signal, And reproduces the contents.

As shown in FIG. 1, the conventional optical pick-up actuator includes a plate 20, which is positioned at a lower portion of the actuator and is formed with a laser passage hole 1, and a U- Of my. A second yoke 23 which is spaced apart from the outer yoke 22 by a predetermined distance and which is fixed outside in the longitudinal direction of the plate 20; An objective lens 25 provided above the laser passage hole 1 provided in the plate 20 to focus the laser beam on the disk reflection surface, An objective lens holder 26 formed to support the objective lens 25 on the outer side and having a structure like a quadrangle, and an objective lens holder 26 provided on the inner surface of the objective lens 26, A focus adjusting coil 27 for controlling the movement of the objective lens 25 in the direction of the optical axis and a focus adjusting coil 27 provided on the inner surface of the objective lens holder 26 and provided on the outer surface of the focusing adjusting coil 27, A tracking adjusting coil 28 for controlling the movement of the objective lens 25 in the radial direction, Mouth from the servo system to adjust the focusing coil 27 and tracking adjustment coil 28 is located on the inner surface of the objective lens holder 26. Four wires 29 for transmitting an output signal and supporting the objective lens holder 26 to swing and attenuating the vibration of the objective lens holder 26 when the impact is exerted from the outside, (30) fixed to the holder (23) to support the wire (29), and a holder (30) attached to the outside of the holder gel (30) A PCB 31 for receiving an output signal from the objective lens holder 26 and a coil PCB 26 for electrically connecting the wire 29 to the focusing and tracking coils 27 and 28, (32).

Further, the objective lens holder 26 of the actuator according to the present invention has a square shape and has a structure in which the objective lens 25 is installed outside the square. That is, a focusing adjusting coil 27 and a tracking adjusting coil 28 are provided at the center of gravity of the objective lens holder 26 so as to be able to flow into the inner yoke 21, and when the optical pick- The center of gravity of the objective lens holder 26 is aligned with the center of gravity of the objective lens holder 26 and thus the focusing adjustment coil 27 and the tracking adjustment coil 28 mounted on the inside of the objective lens holder 26 The objective lens holder 26 is sufficiently moved by the Lorentz driving force.

A groove (not shown in the drawing) is formed at a predetermined position of the objective lens holder 26 so that a balancer 33 for correcting the center of gravity during driving can be fitted.

The operation of the conventional optical pick-up actuator thus constructed will be described in detail as follows.

As shown in FIG. 1 and FIG. 2, the optical detector on the optical system detects the focusing and tracking state on the recording pit of the laser beam. Here, in the case where correction is required as a result of detecting the focusing and tracking states, the servo system transmits an electrical signal to the PCB 31. [ The focus adjusting coil 27 and the tracking adjusting coil 28 provided at the center of gravity in the objective lens holder 26 by the electrical signal transmitted from the PCB 31 through the wire 29 to the coil PCB 32 ) Is subjected to the Lorentz driving force due to the magnetic flux with the permanent magnet 24.

When a current is applied to the focusing adjusting coil 27 and the tracking adjusting coil 28 through the wire 29, the tracking adjusting coil 27 and the focusing adjusting coil 26 are mounted on the inner surfaces of the outer yoke 22 A Lorentz driving force is generated between the permanent magnets 24 and the objective lens holder 26 is driven. An inner yoke 21 is provided at the center of gravity of the objective lens holder 26 so that the focusing adjustment coil 27 is fluidly fitted to the center of gravity of the objective lens holder 26. When the objective lens holder 26 is driven, The center of gravity of the lens holder 26 is aligned.

When a current is applied to the focusing adjusting coil 27 and the tracking adjusting coil 28 through the wire 29 as described above, a strong Lorentz driving force is applied between the permanent magnets 24 attached to the inner surface of the outer yoke 22, The objective lens holder 26 is operated in the tracking direction and the focusing direction and strong repulsive force is applied to the permanent magnet 24 at this time so that the stronger the stronger the stronger the outer yoke 22 supporting the permanent magnet 24 A repulsive force is applied.

As the objective lens holder 26 operates in the upward, downward, left, and right directions, the damping gel filled in the holder gel 34 appropriately absorbs the vibration of the wire 29, It will help you get accurate performance.

As described above, the focusing adjustment coil 27 is wound on the outer circumferential surface of the objective lens holder 27 a number of times several tens to hundreds of times. On the outer surface of the focusing adjustment coil 27, The coil 28 and the focusing adjusting coil 27 are connected to each other by coil plates 32 attached to both sides of the objective lens holder 26 so that current is conducted.

The operation of putting the objective lens 25 on the cantilever of the objective lens holder 26 is particularly effective when the work of assembling the above-mentioned main parts is performed by hand work of the operator. The objective lens 25 is inclined when the objective lens 25 is fixed to the objective lens holder 26 by the U-BID when the objective lens 25 is not accurately fitted into the objective hole of the objective lens holder 26. Therefore, The optical pickup actuator 25 can not accurately connect the laser beam to the disc, and the entire optical pickup actuator can not be used.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an optical pickup actuator in which an objective lens holder is fixed on an optical pickup supporting member and fixed to a bottom portion of an upper and lower moving body moving up and down by a rotation lever When the objective lens is fixed to the fixing jig and the rotating lever is rotated by hand, the objective lens is pressed and fixed to the objective hole of the objective lens holder while the up and down moving bodies move up and down, Thereby improving the assemblability and productivity of the optical pickup actuator.

An object of the present invention is to provide an optical pick-up actuator for operating an objective lens holder in a focusing adjustment direction and a tracking adjustment direction, wherein the bottom surface of the yoke plate of the optical pick- And an objective lens holder provided on the optical pickup support member and moved up and down in a state where the objective lens is fixedly inserted into the bottom surface thereof so that the objective lens is held by the objective lens holder of the optical pickup actuator supported by the optical pickup support member, And an upper and a lower movable member which are press-fitted into the optical pickup actuator.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIGS. 3 to 5, the configuration of the present invention includes an objective lens holder 102 on which the objective lens 130 is seated on the upper surface, An optical pickup actuator (120) for operating in a tracking adjustment direction, comprising: an optical pickup support member (110) in which a bottom surface of a yoke plate (104) of the optical pickup actuator (120) The objective lens 130 is moved up and down in a state where the bottom surface of the objective lens 130 is fixedly pressed on the bottom surface of the objective lens holder 102 of the optical pickup actuator 100 supported by the optical pickup support member 110 And an upper and a lower movable member 120 which are press-fitted into the fixing member.

The optical pick-up supporting member 110 includes a U-shaped base 100 for fixing the optical pick-up actuator 100 by projecting upwardly a fitting projection 51 inserted into the fixing hole 105 of the optical pick- A support plate 40 protruding upward from a rear upper surface of the support plate 40. The support plate 40 includes a jig 50 and an open groove 41 on the upper surface of which the bottom surface of the support jig 50 is provided. ).

The upper and lower movable member 120 includes a rotation lever 62 protruding from one side of the upper surface of the support frame 60 and capable of being rotated by hand and a hinge 64 of the rotation lever 62 A shift gear portion 70 coupled to one side of the rotation shaft 66 to convert the rotational force of the rotation shaft 66 into a horizontal movement force, A long pressurizing shaft 80 coupled to the bottom surface of the speed change gear unit 70 and moving up and down and an up and down moving body 80 coupled to the bottom surface of the pressurizing shaft 80 and having an opening 93 formed on the bottom surface thereof And a fixing jig 95 formed on an upper surface of the opening 93 of the upper and lower moving bodies 90 and having a fitting groove 96 into which the objective lens 130 is fitted and fixed.

Hereinafter, the operation and effect of the present invention will be described with reference to the accompanying drawings.

The objective lens automatic supplying apparatus according to the present invention will now be described in detail with reference to the accompanying drawings. First, a fixing protrusion 51 formed on a supporting jig 50, which is an optical pickup supporting member 110, The optical pickup actuator 100 is fixed to the receiving jig 50 by inserting the optical pickup actuator 105 into the receiving jig 50.

The objective lens 130 which is fitted into the inner hole 103 of the objective lens holder 102 supported by the optical pick-up actuator 100 and press-fitted is fixed to the bottom surface of the fixing jig 95, The lower surface of the objective lens 130 is directed downward into the fitting groove 96 formed in the lens holder 130 and fixed.

In this state, when the operator rotates the rotary lever 62 by hand and pulls the rotary lever 62 downward, the rotary shaft 66 coupled by the hinge 64 is rotated, and the rotary force is transmitted to the upper and lower The pressing shaft 80 moves downward and the upper and lower moving bodies 90 move to the upper side of the optical pick-up actuator 100.

The bottom surface of the objective lens 130 fixed to the fitting groove 96 of the fixing jig 95 is moved to the objective lens holder 102 of the optical pickup actuator 100 as the upper and lower moving bodies 90 move downward, And is inserted into and fitted into the hole 103 formed in the seat 103. [ When the objective lens 130 is pressed and inserted into the hole 103 of the objective lens holder 102 and the operator puts the rotary lever 62 by hand, the objective lens 130 is fitted to the outer peripheral surface of the pressing shaft 80, The upper and lower moving body 90 and the fixing jig 95 are moved upward by the restoring spring 85 which applies a strong tensile force to move the shaft 80 upward.

The optical pickup actuator 100 having completed the assembly of the objective lens 130 is released from the receiving jig 50 which is the optical pick-up support member 110 and the new objective lens 130 is placed in the position of the objective lens holder 102 If it is desired to press-fit in the hole 103, the assembling operation may be repeated through the above-described process.

Therefore, when the objective lens press-in apparatus according to the present invention is used, the optical pick-up actuator with the objective lens holder fixed is placed on the optical pick-up support member and the bottom surface of the movable body The objective lens is fixed to the fixed jig fixed to the fixed jig and the rotating lever is rotated by hand so that the objective lens is pressed and fixed to the objective hole of the objective lens holder while the up and down moving bodies move up and down, Therefore, it is a very useful invention for improving the assemblability and productivity of the optical pickup actuator.

Claims (3)

An objective lens holder 102 on which an objective lens 130 is mounted on an upper surface and an optical pickup actuator 120 for operating the objective lens holder 102 in a focusing adjustment direction and a tracking adjustment direction, An optical pick-up support member 110 in which the bottom surface of the yoke plate 104 of the optical pickup supporting member 110 is fixed to the optical pickup support member 110, And an up-and-down moving member (120) for moving the objective lens up and down to press-fit the objective lens into the objective lens holder (102) of the optical pickup actuator (100) supported by the optical pickup support member An automatic lens presser for an objective lens of an optical pickup actuator. The optical pickup actuator according to claim 1, wherein the optical pick-up support member (110) has a fitting protrusion (51) inserted into a fixing hole (105) of the optical pick-up actuator (100) A support plate 40 having a U-shaped support jig 50 and an open groove 41 on the upper surface of which the bottom surface of the support jig 50 is provided; And a support (60) for supporting the optical pickup actuator. The apparatus according to claim 1 or 2, wherein the up-and-down moving member (120) comprises a rotation lever (62) protruding from one side of an upper side of the support base (60) A rotating shaft 66 which is coupled by a hinge 64 of the rotating shaft 66 and rotated by a rotating lever 62 at a predetermined angle and a rotating shaft 66 which is coupled to one side of the rotating shaft 66 and converts the rotating force of the rotating shaft 66 into a horizontal moving force A long pressurizing shaft 80 coupled to the bottom surface of the speed change gear unit 70 to be moved up and down and an open portion 93 connected to the bottom surface of the pressurizing shaft 80, And a fixing jig 96 formed on the upper surface of the opening 93 of the upper and lower moving bodies 90 and having an insertion groove 96 in which the objective lens 130 is fitted and fixed, 95). ≪ RTI ID = 0.0 > 11. < / RTI >