KR100207261B1 - A holder object lens of optical pick-up device - Google Patents

Abstract

The present invention fixes the objective lens to the objective lens holder to be exactly horizontal, thereby facilitating the operation of coupling the yoke plate provided with the objective lens holder to the pickup base, and the optical axis movement direction of the objective lens is exactly perpendicular to the disk. The objective lens holder of the optical pickup device for.

According to an exemplary embodiment of the present invention, a first holder 60 having a first seating portion 62 in which half of a circumference and a bottom circumference of an objective lens 50 is seated, and a first semicircular hole 64 through which a laser passes therethrough is formed. A second seating portion 72 and a second semicircle hole 74 are formed to be symmetrical with the first seating part 62 and the first semicircular hole 64 of the first holder 60 to fix the fixing means 67. It is composed of a second holder (70) symmetrically coupled to the first holder (60) by.

In the present invention, the objective lens 50 is coupled to the objective lens holder without bonding, so assembling is easy, and the objective lens 50 is fixed to the objective lens holder to be exactly horizontal so as to pick up the yoke plate 90 to the pickup base 100. It is possible to quickly adjust the position by installing on the target, and to accurately focus the laser light on the disk 110 because the objective lens 50 can be moved in a direction perpendicular to the disk 110 when moving in the optical axis direction. Can be.

Description

Objective holder for optical pickup device

The present invention relates to an objective lens holder for fixing an objective lens of an optical pickup device. In particular, the present invention eliminates the bonding operation by mounting and coupling the objective lens between the first holder and the second holder, and accurately fixes the objective lens to the objective lens holder. The present invention relates to an objective lens holder of an optical pickup device for horizontally fixing a yoke plate to a pickup base to quickly adjust a position.

In general, an optical pickup device is a device installed in a CD player for irradiating laser light to the disc and receiving the light reflected from the disc to reproduce the recording contents of the disc. And an objective lens for focusing the laser light emitted from the hologram element on the disk surface.

As shown in FIG. 1, the optical pickup apparatus fixes the objective lens holder 10 to which the objective lens 16 is adhered to the yoke plate 20 with a suspension wire 22 so as to be movable. 20 is mounted on the pickup base 30 provided with the hologram element.

On the other hand, since the objective lens 16 must be installed to be exactly horizontal to the plane of the disk to focus the laser light at the correct position on the disk, the objective lens 16 is incorrectly adhered to the objective holder 10 and tilted. In the true state, the height balance of the yoke plate 20 on which the objective lens holder 10 is installed is adjusted on the pickup base 30 using the fixing screw 32 and the adjusting screw 34 so that the objective lens 16 is adjusted. Level it with the disk face.

Detailed structure of the objective lens holder 10 for fixing the objective lens 16 in the above is, as shown in Figure 2, the through hole 14 for passing the laser light of the hologram element to the center of the objective lens holder 10 ) Is formed, and a seating portion 12 on which the fastening portion 18 formed below the objective lens 16 is seated above the through hole 14. Therefore, when the objective lens 16 is coupled to the objective lens holder 10, the fastening portion 18 of the objective lens 16 is inserted from the image side of the seating portion 12 of the objective lens holder 10. The adhesive is applied around the fastening portion 18 of 16 and then cured to fix the objective lens 16 in a non-flowing manner.

Meanwhile, when the objective lens 16 is coupled to the objective lens holder 10, the upper surface of the objective lens 16 is coupled in an inclined state without being exactly horizontal with respect to the objective lens holder 10. There is. At this time, the height of the yoke plate 20 supporting the objective lens holder 10 is adjusted so that the upper surface of the objective lens 16 is horizontal with respect to the disk 40 surface, which is adjusted with the fixing screw 32. By adjusting the height balance of the yoke plate 20 provided on the base 30 using the screw 34, the upper surface of the objective lens 16 is made to be parallel to the surface of the disk 40.

However, in the objective lens holder 10 as described above, as shown in FIG. 1, when the objective lens 16 is incorrectly adhered to the objective lens holder 10 and is inclined greatly to one side, When the installation state is corrected on the base 30 so that the upper surface of the objective lens 16 is flush with the surface of the disk 40, the objective lens 16 is used to form a focus on the disk 40 surface. When the lens holder 10 is moved in the focusing direction, the objective lens holder 10 is moved in the inclined focusing direction F so that the focal point of the laser focused on the objective lens 16 is unintentionally moved in one direction T on the disk plane. Will be moved to). This is fixed in the horizontal state with respect to the yoke plate 20, the objective lens holder 10 is raised in the vertical direction with respect to the yoke plate 20 when moving in the focusing direction, to adjust the upper surface of the objective lens 16 horizontally In order to fix the yoke plate 20 to one side, the moving direction of the objective lens holder 10 becomes the inclined focusing direction F.

Accordingly, the objective lens holder 10 must continuously move in the tracking and focusing direction to correct the error value in order to accurately form the focal point of the objective lens 16 on the disc 40. Therefore, the objective lens holder 10 The acceleration ability of the lens is reduced and a lot of power is consumed to move the objective lens holder 10. When the objective lens 16 is adhered in a severely inclined state, the focus of the laser is focused on the disk 40 plane. There is a problem that becomes impossible.

The present invention has been made in order to improve the conventional problem, the object of the present invention is to fix the objective lens to the objective lens holder to be exactly horizontal, by coupling the yoke plate fixed to the objective lens holder to the pickup base, The objective is to move the object lens exactly vertically to the disk to form the correct focus on the disk surface.

In order to achieve the above object, the present invention provides a first holder having a first seating portion in which half of the circumference and the bottom of the objective lens are seated, and a first semicircular hole through which a laser passes, and the first holder. It is an objective lens holder of the optical pickup actuator comprising a first seating portion of the holder and a second seating portion symmetrical to the first semicircle and a second holder symmetrically coupled to the first holder by means of fastening means. It is done.

1 is a schematic view showing a general optical pickup device.

2 is an exploded perspective view illustrating an objective lens holder of a general optical pickup device;

Figure 3 is an exploded perspective view of the objective lens holder according to the present invention.

Figure 4 is a side cross-sectional view showing a coupling state of the objective lens holder according to the present invention.

Figure 5 is a cross-sectional view showing a coupling state of the objective lens holder according to the present invention.

6 is a schematic view showing an installation state of the objective lens holder according to the present invention.

〈Description of the symbols for the main parts of the drawings〉

50: objective lens 52, 54: stepped portion

60: first holder 62: first seat

64: first seating portion 66: locking portion

67: fixing means 68: indentation hole

69: indentation shaft 70: second holder

72: second seating portion 74: the second semi-circular hole

80: groove 82: incision

90: yoke plate 100: pickup base

Hereinafter, a preferred embodiment of the objective lens coupling structure of the actuator according to the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 3, a first semicircular hole through which a laser beam passes downward is formed in the first seating part 62 in which half of the circumference and the bottom circumference of the objective lens 50 are seated. A first holder 60 having a 64 formed therein, a second seating portion 72 and a second semicircle symmetrical with the first seating portion 62 and the first semicircular hole 64 of the first holder 60. Ball 74 is formed is composed of a second holder 70 is symmetrically coupled to the first holder 60 by the fixing means (67).

The fixing means 67 is a plurality of indentation holes 68 formed on both sides of the first holder 60 and a plurality of indentation shafts formed in the second holder 70 to be press-fitted into the indentation hole 68 ( 69).

In addition, the upper side of the first seating portion 62 of the first holder 60 and the second seating portion 72 of the second holder 70 is pressed to push the stepped portion 52 formed around the upper side of the objective lens 50. The portion 66 is protruded.

Meanwhile, as described above, a recess 80 for winding the focusing coil is formed around the objective lens holder including the first holder 60 and the second holder 70, and the first holder 60 and the second holder. At the outer end of the 70, a cutout 82 for fitting the inner yoke 94 of the yoke plate 90 is formed.

The operation of the objective lens holder having the above structure will be described.

First, the order of assembling the objective lens 50 to the objective lens holder is illustrated in FIG. 5, in which the stepped portion formed at the bottom of the objective lens 50 at the first seating portion 62 of the first holder 60 ( One half of the 54 is seated, and the pressing shaft 69 formed in the second holder 70 is inserted into the pressing hole 68 of the first holder 60. Accordingly, the second seating portion 72 of the second holder 70 is symmetrically coupled to the first seating portion 62 of the first holder 60 to compress the bottom stepped portion 54 of the objective lens 50. And the latching portion 66 formed on the first holder 60 and the second holder 70 presses the stepped portion 52 formed on the upper side of the objective lens 50, and the objective lens 50 It is firmly fixed by the first holder 60 and the second holder 70.

At this time, since the pressing shaft 67 of the second holder 70 is inserted into the pressing hole 68 of the first holder 60, the objective lens 50 is firmly fixed, so that no additional bonding operation is required.

As shown in FIG. 4, the first semi-circular hole 64 of the first holder 60 and the second semi-circular hole 74 of the second holder 70 are joined to form a completely circular laser hole, thereby forming a hologram. The light irradiated from the device can reach the objective lens 50.

Meanwhile, the focusing coil for moving the objective lens holder in the optical axis direction is wound around the groove 80 of the objective lens holder in which the objective lens 50 is fixed as described above, and for moving the objective lens holder in the tracking direction thereon. The winding of the tracking coil is pre-wound and bonded, and when this operation is completed, the objective lens holder is movable to the yoke plate 90 by the suspension wire 92.

Then, the fixing screw 102 is inserted into the yoke plate 90 to be fixed to the pickup base 100, and the top surface of the objective lens 50 is adjusted by adjusting the height balance of the yoke plate 90 with the two adjusting screws 104. It is flush with the surface of the disk 110. In this embodiment, since the state in which the objective lens 50 is fixed to the objective lens holder is exactly horizontal, it is easy to adjust the height balance of the yoke plate 90 in the pickup base 100.

The objective lens 50 having a fixed position as described above is provided in a horizontal state with respect to the objective lens holder and the disk 110 when operating in the focusing direction to form a focus on the disk 110. The holder is moved up and down exactly in the vertical direction F, so that the focus of the objective lens 50 can be formed at the correct point without moving from side to side by the vertical movement of the objective lens holder.

As described in the above embodiments, the present invention combines the second holder 70 for seating the other half of the objective lens 50 with the first holder 60 for seating the half of the objective lens 50. As the state where the lens 50 is fixed to the objective lens holder is exactly horizontal, the objective lens 50 is coupled to the objective lens holder without bonding, thereby improving assembling, and the yoke plate 90 having the objective lens holder installed thereon. Is fixed by only fine position correction on the pickup base 100 so that the position correction operation can be quickened, and the objective lens 50 can move in the direction F which is exactly perpendicular to the disc 110. Since the focus can be accurately formed, the acceleration of the objective holder is improved and power consumption is reduced.

Claims (4)

In the holder for fixing the objective lens 50 of the optical pickup device, A first holder 60 having a first seating portion 62 in which half of the lateral and bottom circumferences of the objective lens 50 are seated, and a first semicircular hole 64 through which a laser passes; A second seating portion 72 and a second semicircular hole 74 are formed to be symmetrical with the first seating part 62 and the first semicircular hole 64 of the first holder 60, and thus are fixed to the fixing means 67. The objective lens holder of the optical pickup device, characterized in that consisting of a second holder (70) symmetrically coupled to the first holder (60). The method of claim 1, wherein the fixing means 67 is formed in the plurality of indentation holes 68 formed on both sides of the first holder 60, the second holder 70 to be pressed into the indentation hole 68 The objective lens holder of the optical pickup device, characterized in that consisting of a plurality of indentation shaft (69). According to claim 1, wherein the first holder 60 and the second holder 70 of the first seating portion 62 and the second seating portion 72, the upper side formed around the image of the objective lens 50 The objective lens holder of the optical pickup device, characterized in that the engaging portion 66 for pressing the jaw portion 52 protruded. The method of claim 1, wherein the groove 80 for winding the focusing coil is formed around the first holder 60 and the second holder 70, the first holder 60 and the second holder 70 The objective lens holder of the optical pickup device, characterized in that the cut-out portion 82 is inserted into the inner yoke (94) of the yoke plate (90).