KR19980050026A - Optical pickup device for easy tilt adjustment - Google Patents

Abstract

The present invention relates to an optical pick-up device composed of a pickup base and an actuator, and more particularly, to simplify the structure of the pickup base to which the reflective mirror is obliquely attached, and to ensure a certain level of regulation of the objective lens mounted to the actuator during assembly. The present invention relates to an optical pickup device that is easy to tilt and has improved tilt so that the amount of jitter can be greatly reduced.

The present invention has a pick-up base having an inclined portion formed on an upper surface, and having a recessed and formed light guide groove therein, and having a first curved portion cut in a semi-cylindrical shape on one upper surface of the receiving portion, and an upper surface of the vertical wall. A base portion having a second curved portion, a guider having a guide groove formed on an upper surface of one side of the vertical wall, and having a plurality of tilt adjustment tab holes and through holes; A first contact portion to be fitted to the first bent portion on the outer yoke, a second contact portion to be fitted to the second bent portion, a handle on one side of the second contact portion, a tab hole and a through hole on the upper surface of the plate Plate portion formed; And a screw adjusting unit having a plurality of tilt adjusting screw members fastened vertically to the tab hole through the through hole.

Description

Optical pickup device for easy tilt adjustment

The present invention relates to an optical pick-up device composed of a pickup base and an actuator, and more particularly, to simplify the structure of the pickup base to which the reflective mirror is obliquely attached, and to ensure a certain level of regulation of the objective lens mounted to the actuator during assembly. The present invention also relates to an optical pickup device that is easy to tilt and has improved tilt so that the amount of jitter can be greatly reduced.

In general, optical pickup devices employed in optical disk players such as Mini Disk Player, Compact Disk Player, and Laser Disk Player are used for user's desired track position on the disc. After inputting 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 converted into an electrical signal so that the recorded contents on the disk surface can be reproduced. It is a device mounted below the disk vertically.

As shown in FIG. 1, the optical pickup device 100 is provided with a reflective mirror 113 mounted on the adhesive part 113a to refract the laser light emitted from the laser diode 110 at a predetermined angle of 45 °. An actuator having a base 110 and a centrally mounted objective lens 120 that can focus the laser light refracted by the reflecting mirror 113 onto a pit on a disk above the pickup base 110. 130).

In addition, after the laser light incident on the disk is reflected from the pit of the disk, the pickup base 110 is focused by the objective lens 120 again, and the reflection mirror 113 makes a predetermined angle. The photodetector of the hologram element is located on one side of the pickup base 110 at the same position as the laser diode 111 so as to receive the laser beam refracted again and convert it into an electrical signal so as to be properly transformed into an audio and video signal. (112) is provided and configured.

Meanwhile, as shown in FIG. 1, the actuator 130 has an objective lens 120 that focuses on a reflective surface of the disk at the center of the bobbin 131, and the bobbin 131. Around the winding of the focusing coil (Focusing Coil) 132 and the tracking coil (Tracking Coil) 133 is configured to be movable in the upper portion of the plate 134 when the power is applied.

And, both sides of the bobbin 131 is provided with a coil printed circuit board 135, which is soldered and assembled with a suspension wire (Suspention Wire) 136 capable of transmitting external power and attenuating vibrations from external shocks. A pair of inner yokes 137 provided on an upper surface of the plate 134 may include an outer yoke 139 having a magnetic body 138 attached thereto, and one side of the plate 134 may include a suspension printed circuit board ( While the second yoke 141 is equipped with a 142, the gel holder 143 which connects the other end of the wire 136 by injecting a certain amount of damping gel 144 to the inside of the second yoke 141 is It is comprised.

And, the actuator 130 is configured as described above is assembled to the upper side of the pickup base 110 mounted on the adhesive portion 113a injection-reflecting the reflective mirror 113 at a predetermined angle, the objective lens 120 And the reflection mirror 113 are located on the same vertical axis, the focus of the laser beam by the focusing of the objective lens 120 to perform precise recording and reproduction on the upper surface of the reflection mirror 113 and the pit of the disk In order for the height of the objective lens 120 to be accurately positioned on a predetermined regulation height (H) measured from the upper surface of the pickup base 110, the actuator (located immediately above the pickup base 110) 130, as well as to be assembled in accordance with the predetermined regulatory height, as well as the degree of tilt of the actuator 130 acting as a fatal cause of jitter must be precisely measured and adjusted before assembly completion.

Accordingly, as shown in FIG. 2, in which the plate 134 of the actuator 130 having the objective lens 120 is assembled on the pickup base 110, the predetermined height H of the objective lens 120 is As shown in FIG. 1, a round part 115a formed on an inner side surface of the melted part 115 injection-molded in the center part of the pickup base 110 and a through hole 151 formed in the center part of the plate 134 are illustrated. Protruding portions 134a provided in a round shape at the edges of the lateral contact with each other are regulated. However, due to the mold structure, injection molding of the rounded portion 115a formed in the fusing portion 115 of the pickup base 110 is very difficult, and thus the manufacturing cost is large, whereas the upper mold thickness is thin, so the dimensional change during cooling is large. Since the height of relief of the objective lens 120 due to the contact between the protrusion 134a of the plate 134 and the round portion 115a that is pressed is not precisely guaranteed, the focus performance of the objective lens 120 may be improved. There is a problem of deterioration.

In addition, in the related art, before the optical pickup player 100 is mounted, the tilt of the objective lens 120 mounted on the actuator 130 is first measured and adjusted, and then the pickup base 110 is mounted. Since the tilt of the reflective mirror 113 of the measurement is separately measured and adjusted, and after assembling the actuator 130 and the pick-up base 110 which have been determined to be passed, the tilt of the second must be readjusted through the measurement process. Due to the repeated tilt adjustment operation, the assembly process is very cumbersome, whereas the tilt adjustment of the actuator 130 cannot be strictly performed.

Accordingly, the present invention has been made to solve the above problems, the object of which is to remove the protrusion of the pickup base and the protrusion of the plate to match the fixed height of the objective lens to reduce the injection molding ratio of the pickup base It can reduce the tilt adjustment work that was performed before the whole assembly process of the optical pick-up device and can reduce the assembly process time to improve the work productivity, and also strictly control the constant regulation height of the objective lens to ensure the focusing accuracy. The present invention aims to provide an optical pick-up device with easy tilt adjustment that can significantly reduce jitter.

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

Figure 2 is a longitudinal sectional view showing an assembled state of the pickup base and the plate according to the prior art.

Figure 3 is a perspective view of the base portion constituting the optical pickup device according to the present invention.

4 is a perspective view of a plate portion constituting the optical pickup device according to the present invention.

Figure 5 is a perspective view of the optical pickup device easy to tilt adjustment in accordance with the present invention.

Explanation of symbols for main parts of the drawings

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus, 10 Base part, 11 Pick-up base, 12 Inclined part, 13 Guide groove, 14 Accommodating part, 15 First valley part, 16 Vertical wall, 17 Second valley part, 20: Plate portion, 21: plate, 22: first contact portion, 23: second contact portion, 24: handle, 30: screw adjustment portion, 31: tilt adjustment screw member, 113: reflection mirror, 120: objective lens

The present invention for achieving the above object,

An optical pickup apparatus having a laser diode for emitting laser light and a photodetector for receiving light, an objective lens for focusing the laser light refracted by the reflection mirror to form a focus, and capable of reproducing recording on a disk surface.

The inclined portion to which the reflective mirror is mounted is formed on the upper surface, and the pick-up base having a light guide groove penetrated to a predetermined depth is formed in the receiving portion to which the laser diode is mounted, and has a semi-cylindrical shape on one upper surface of the receiving portion. And a first curved portion cut into the upper surface of the vertical wall facing the receiving portion, and having a second curved portion, and having a guider formed at one side of the vertical wall with a guide groove formed on the upper surface thereof. A base portion each having a plurality of tilt adjustment tab holes and through holes formed on an upper surface thereof;

A first contact portion to be fitted to the first bent portion is mounted to the outer yoke of the plate as a screw member, and a second contact portion to be fitted to the second bent portion is provided on the suspension printed circuit board of the plate, and on one side of the second contact portion. A plate portion having a handle and having a tab hole and a through hole in an upper surface of the plate;

And a screw adjusting portion fastened to the tab hole through the through hole and having a plurality of tilt adjusting screw members having a spring member having a predetermined elastic restoring force to adjust the tilt of the plate. By providing an optical pickup device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an optical pickup device for easy tilt adjustment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a perspective view showing a base portion employed in the optical pickup apparatus according to the present invention, Figure 4 is a perspective view showing a plate employed in the optical pickup apparatus according to the present invention, Figure 5 is a tilt adjustment according to the present invention Overall perspective view of an easy optical pickup device.

The optical pickup device 1 for easy tilt adjustment according to the present invention is mounted on an optical disc player, and as shown in FIGS. 3 and 4, the structure is simple and injection molding is simpler than in the related art. While it is possible to ensure the constant regulation height H of 120, the tilt adjustment is easy and the precision is high, so that the disc can be reproduced accurately. The device 1 includes a base 10 having a laser diode 111 for emitting a laser light and a photo detector 112 for receiving the laser light, and a reflecting mirror 113 for refracting the laser light. ) And a plate portion 20 on which the bobbin 131 having the objective lens 120 focusing the laser beam is focused, is mounted, and the plurality of tilt adjustment screw members 31 are assembled. As to be able to strictly manage the tilt of the objective lens 120.

That is, the base portion 10 constituting the optical pickup device 1 for easy tilt adjustment according to the present invention is a reflection mirror 113 is adhered to the vicinity of the center of the pickup base 11 composed of injection molding, One side receiving portion for mounting the laser diode 111 from the inclined portion 12 is provided with an inclined portion 12 formed to be inclined at a predetermined angle with respect to the horizontal plane, preferably 45 degrees. To form a recessed depth up to 14) to form a light guide groove 13 is transmitted to the outside to allow the laser light refracted by the reflective mirror 113 to pass through without interference. In addition, a first curved portion 15 cut in a semi-cylindrical shape is formed on an upper surface of the pick-up base 11 on one side of the accommodating portion 14, and the vertical wall 16 facing a predetermined distance away from the accommodating portion 14. The second curved portion 17, which is cut in a semi-cylindrical shape having the same shape as the first curved portion 15, is formed therein, and on one side of the vertical wall 16, a guide groove 18 is formed on the upper surface. The guider 19 is integrally equipped.

In addition, as shown in FIG. 3, a plurality of tab holes 11a are formed on one side of the pickup base 11 on which the reflective mirror 113 is mounted, and a through hole 11b is formed on the other upper surface thereof. Formed and equipped. The position where the plurality of tab holes 11a and the through holes 11b are formed is preferably formed at a vertex position drawing a triangle.

As shown in FIG. 1, the plate 20 for mounting the bobbin 131 on which the objective lens 120 focuses the laser light to form a focal point is located at the center of the plate 21. The through-hole 25 is provided to pass through, and the outer yoke 139 mounted on the upper surface of the plate 21 is face-contacted with the inner circumferential surface of the first bent portion 15 as a screw member 22a. The first contact portion 22 is provided and configured. The second contact portion 23 is formed in the same shape as the first contact portion 22 and is in surface contact with the second curved portion 17. The second contact portion 23 is mounted on the upper surface of the plate 21, and suspension printing is performed. A second yoke 141 fixed to one side of the circuit board 142 is provided.

In addition, the handle 24 is mounted on one side of the second contact portion 23, and when the plate 21 and the pickup base 11 are assembled, the body of the handle 24 is formed of the pickup base 11. The guide groove 18 of the guider 19 provided integrally with the vertical wall 16 is inserted into the guide groove 18 so as to partially protrude to the outside. The first and second contact portions 22 and 23 joined to (17) are slidably moved on the inner circumferential surface of the arc to appropriately adjust the degree of tilt of the plate 21.

In addition, a through hole 21a is formed on the upper surface of the plate 21 on which the objective lens 120 is mounted to coincide with the one side tab hole 11a formed in the pickup base 11. The tab hole 21b which matches the through-hole 11b of 11 is formed and provided.

In addition, the screw adjustment unit 30 that can adjust the tilt of the plate 21 by the pitch of the screw as well as the tilt adjustment using the handle 24 provided on the plate 21 is assembled optical pickup device ( A plurality of tilt adjustment screws which are respectively fastened to the tab holes 11a and 21b through the through holes 11b and 21a at the upper and lower sides of 1) and have a spring member 32 having a constant elastic restoring force. It consists of the member 31.

As shown in FIG. 5, the optical pickup device 1 for easy tilt adjustment according to the present invention having the structure as described above picks up the first, second curved portions 15 and 17 cut in a semi-cylindrical shape. The first and second contact portions 22 and 23 formed on the receiving portion 14 and the vertical wall 16 of the base 11, respectively, and joined to the outer yoke 139 and the suspension of the plate 21. The plate 21 is attached to the printed circuit board 142 and provided with a handle 24 for adjusting the tilt of the plate 21 on one side of the second contact portion 23, thereby forming the plate 21. The guide groove of the guider 19 is assembled on the upper surface of the pick-up base 11 having the 113 at a constant height at all times, and the tilt deformation of the objective lens 120 according to the tilt deformation of the plate 21. The deformed tilt can be adjusted by rotating the handle 24 inserted and supported by 18. Then, the tilt adjustment screw member 31 fastened up and down through the tab holes 11a and 21b is rotated on the upper and lower sides of the optical pickup device 1 to move the pitch by a predetermined distance. By adjusting the tilt-deformed plate 21, the tilt of the objective lens 120 provided at the center can be adjusted.

That is, the plate 21 assembled on the upper surface of the pickup base 11 is tilted and the degree of tilt of the objective lens 120 mounted on the bobbin 131 is increased, and thus the amount of jitter generated is detected as a reference value. There is a big deviation from the above. In this case, the tilt of the objective lens 120 should be precisely adjusted to reduce the amount of jitter below the reference value.

Accordingly, the pickup base 11 is formed by joining the first and second contact portions 22 and 23 on the inner circumferential arc of the semi-cylindrical first and second curved portions 15 and 17 formed in the pickup base 11. ) And the plate 21 are assembled to each other, the second contact portion 23 is provided on one side, the handle 24 supported by the guide groove 18 is rotated to rotate the first and second curved portions 15 Since the inner circumference of the first and second contact portions 22 and 23 joined to (17) can slide on an arc, the evaluation process for the tilt is performed while the optical pickup device 1 is assembled. At the same time, the tilt-deformed objective lens 120 can be positioned on the same vertical axis as the reflective mirror 113.

In addition, since the first and second contact portions 22 and 23 of the plate 21 are in surface contact with the first and second curved portions 15 and 17 of the pickup base 11, The fixed height H of the objective lens 120 measured by the upper surface of the pickup base 11 and the predetermined distance between the objective lens 120 and the reflection mirror 113 can be stably maintained without dimensional deformation. will be. Accordingly, the eluting portion 115 having the round portion 115a formed on the upper surface of the pickup base 110 does not need to be separately injection molded to the pickup base 11 as well as the round portion 115a. Since it is not necessary to protrude the protrusion 134a in the inner circumferential surface of the through hole 151 of the plate 134 in contact with the predetermined height of the objective lens 120 in contact with the Injection molding can be easier than the conventional manufacturing cost can be reduced, the overall structure can be simplified.

On the other hand, by using the handle 24 to adjust the tilt deformation of the objective lens 120, the tilt adjustment screw member 31 from the lower side through the through hole (11b) of the pickup base 11 through the plate By engaging the tab hole 21b of 21 to shift the pitch, the tilting degree of the plate 21 can be adjusted by the elastic force of the spring member 32 in contact with the lower surface of the pick-up base 11. Then, another tilt adjustment screw member 31 is fastened to the tab hole 11a of one side of the pickup base 11 through the through hole 21a of the plate 21 from the upper side to perform the tilt adjustment as described above. On the other hand, another tilt adjustment screw member 31 which is fastened from below by another tab hole 11a of the pick-up base 11 has its one end in contact with the lower surface of the plate 21, thereby providing a triangular shape. The plurality of screw members 31 fastened at positions corresponding to the vertices maintain the predetermined height H, and the tilt can be adjusted by moving the pitch of the screw members 31.

According to the optical pickup device 1, which is easy to adjust the tilt, according to the present invention, the inclined portion 12 includes a reflecting mirror 113, and the first and second curved portions 15 and 17 cut in a semi-cylindrical shape. The formed pickup base 11 is assembled with the plate 21 having the first and second contact portions 22 and 23, thereby regulating the constant regulation of the objective lens 120 forming the focus of the laser light in the assembled state. The height H can be kept constant from the upper surface of the pickup base 11 at all times, and the tilt deformation is adjusted by the handle 24 provided on one side, and the image of the assembled optical pickup device 1 is assembled. By having a plurality of tilt adjustment screw members 31 fastened downward and shifting the pitch, it is possible to perform more precise tilt adjustment, which can significantly reduce the amount of jitter, and the pick-up base 11 and the plate in the mold fabrication than in the prior art. (21) can reduce the manufacturing cost and reduce the manufacturing cost Eojinda.

Claims (3)

A laser diode 111 for emitting laser light and a photodetector 112 for receiving light are provided, and an objective lens 120 for focusing the laser light refracted by the reflection mirror 113 to form a focal point is recorded. In the optical pickup device capable of reproducing, the inclined portion 12 on which the reflective mirror 113 is mounted is formed on the upper surface, and a predetermined depth is formed to the receiving portion 14 on which the laser diode 111 is mounted. And a pickup base 11 having a light guide groove 13 formed therethrough, and having a first curved portion 15 cut in a semi-cylindrical shape on an upper surface of one side of the accommodating portion 14, wherein the accommodating portion ( 14 is provided with a second curved portion 17 on the upper surface of the vertical wall 16 facing the 14, and a guider 19 having a guide groove 18 formed on the upper surface on one side of the vertical wall 16. And a plurality of tilt adjustment tab holes 11a and through holes 11b on the upper surface of the pickup base 11. Forming each base part (10); The first contact portion 22 to be joined to the first valley 15 is mounted to the outer yoke 139 of the plate 21 as a screw member 22a, and the second contact portion to be joined to the second valley 17. (23) is provided on the suspension printed circuit board 142 of the plate 21, the handle 24 is provided on one side of the second contact portion 17, while the tab hole in the upper surface of the plate 21 ( A plate portion 20 having a 21b and a through hole 21a formed therein; A plurality of tilt adjustment screw members 31 are fastened up and down to the tab holes 11a and 21b through the through holes 11b and 21a and have a spring member 32 having a constant elastic restoring force. And a screw adjusting part (30) for adjusting the tilt of the plate (21). 2. The optical pickup apparatus of claim 1, wherein the plurality of tab holes 11a and through holes 11b are formed at positions of vertices of triangles formed on the upper surface of the pick-up base 11. . The pickup base 11 and the plate 21 of claim 1, wherein the tilt adjustment screw member 31 adjusts the tilt while adjusting a predetermined height of the objective lens 120 by pitch shift. Easy to tilt adjustment optical pickup device characterized in that the plurality of fastening to the upper and lower.