KR20030054210A - Pick-up manufacturing method of optic recording/reproducing system - Google Patents

Abstract

PURPOSE: A method for manufacturing an optical pickup of an optical recording/playing apparatus is provided to reduce the number of assembling processes and the manufacturing cost by manufacturing several parts in one manufacturing process. CONSTITUTION: A substrate fixing stand(10), a yoke(7), and a lens holder(3) are formed on a top side of a pickup base(1) through injection molding. The lens holder is placed at an upper part of a light entrance hole and is connected with the pickup base by connecting parts formed at both ends of the lens holder. The connecting parts are processed to separate the lens holder from the pickup base. Optical components are assembled at a bottom of the pickup base and a magnet is bonded to an inner surface of the yoke. The lens holder is combined with an insertion hole(21) of a bobbin wound with a tracking coil and a focus coil(6). The bobbin is secured at the upper part of the light entrance hole of the pickup base. A plurality of suspension wires are connected with wire connecting parts of the bobbin and then connected with a printed circuit board fixed at the substrate fixing stand. An objective lens(4) is secured at a lens securing part of the lens holder.

Description

Optical pickup manufacturing method of optical recorder {PICK-UP MANUFACTURING METHOD OF OPTIC RECORDING / REPRODUCING SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup manufacturing method of an optical recorder, and more particularly, an optical recorder which simplifies the manufacturing process by integrally injecting the substrate holder and the lens holder during injection of the pickup base and processing only the lens holder in a later step. To an optical pickup manufacturing method.

In general, an optical recording player using an optical disk such as a compact disk (CD), a laser disk (LD), or a digital video disk (DVD) as a recording medium is installed perpendicularly to the disk, so that it is straight in the radial direction of the disk. A hologram element is provided which moves to detect a desired track position on the disc, and converts the reflected light of the laser beam incident on the pit of the disc into an electrical signal to reproduce the recorded contents recorded on the disc.

The hologram element accurately focuses the laser beam on a predetermined pit of the disc, while the optical axis of the objective lens constituting the optical pickup by the actuator allows the reflected light of the laser beam reflected from the pit of the disc to be accurately incident on the hologram element. Parallel movement of the objective lens in the horizontal direction is performed in parallel with the movement of the objective lens. The micro-movement of the objective lens by the actuator is carried out on both sides of the focus coil and the focus coil wound on the side of the bobbin to which the lens holder is coupled. The vertical and horizontal movements are performed by selectively applying currents to the tracking coils respectively attached to the tracking coils.

In addition, both sides of the bobbin coupled to the upper surface of the pickup base is integrally formed with a yoke to which magnetic is attached, and a rear of the yoke is provided with a PCB holder for fixing the PCB, and the PCB holder has a pickup base. It is fixed by a screw that is inserted through the screw hole from below.

However, in the optical pickup structure of the conventional optical recorder, assembled as described above, a pickup base for installing various optical components, a yoke for attaching permanent magnets, and a substrate fixing plate for fixing a printed circuit board are manufactured as separate components. Since it is assembled in the pickup base, there is a limit in reducing the manufacturing cost according to the reduction in manufacturing labor and assembly labor, as well as the product of the assembly state finally assembled by the accumulated error in the process of assembling each component There was a problem that caused a significant assembly error caused by the quality degradation.

The object of the present invention devised in view of the above problems is to provide an optical pickup manufacturing method of an optical recorder that does not have various problems as described above.

It is another object of the present invention to provide an optical pickup manufacturing method of an optical recording / reproducing apparatus suitable for reducing the manufacturing cost according to the reduction of the manufacturing process by simultaneously injecting several components at the same time and simultaneously injecting the pick-up base. .

It is another object of the present invention to provide an optical pickup manufacturing method of an optical recorder suitable for simplifying the assembly structure of parts to reduce the occurrence of assembly errors.

1 is an exploded perspective view showing an optical pickup structure of an optical recorder according to the present invention.

2 is a cross-sectional view of the assembled state of FIG.

3 is a cross-sectional view showing an injection state of the pickup base of the present invention.

Figure 4 is a cross-sectional view showing a state in which the lens holder is separated from the pickup base of the present invention.

** Description of symbols for the main parts of the drawing **

1: pickup base 3: lens holder

4: objective lens 8: magnet

9: printed circuit board 10: substrate holder

12: York

In order to achieve the above object of the present invention, a method for manufacturing an optical pickup of the optical recorder,

The substrate holder and the lens holder are integrally formed on the upper surface of the pickup base,

There is provided an optical pickup manufacturing method of an optical recording / reproducing apparatus, characterized in that the lens holder is processed in the order of separating by post processing.

The optical pickup manufacturing method of the optical recorder according to the present invention as described above will be described in more detail with reference to the embodiments of the accompanying drawings.

1 is an exploded perspective view showing an optical pickup structure of an optical recorder according to the present invention, and FIG. 2 is an assembled cross-sectional view of FIG. 1, as shown in FIG. The lens holder 3 is coupled to the upper side of the light entrance / exit hole 2, and the objective lens 4 is inserted into the lens seat 3a formed on the upper surface of the lens holder 3. .

The bobbin 5 is coupled to the outside of the lens holder 3, and the focus coil 6 is wound around the bobbin 5 to move finely in the optical axis direction and to be adjusted by the focusing of the objective lens 4. Both ends of the focus coil 6 are attached with tracking coils 7 for finely moving in the radial direction of the optical axis and for adjusting the tracking of the objective lens 4.

In addition, the yoke 12 is integrally protruded from both sides of the upper surface of the pickup base 1 on which the bobbin 5 is installed, and the magnet 8 is attached to the inner surface of the yoke 12 with an adhesive. In the periphery of the yoke 12, a substrate holder 10 for fixing the printed circuit board 9 for supplying power to the actuator is integrally formed on the upper surface of the pickup base 1.

The hologram element 11 is disposed below the light entry / exit hole 2 formed in the pickup base 1.

The bobbin (5) is made of a plastic material, the insertion hole 21 is formed so that the lens holder (3) can be inserted in the center, the coil groove 22 is formed on the side of the coil winding, the upper surface on both sides Wire connecting portion 23 for connecting the suspension wire for supplying power to the coil is formed, and the guide protrusions 24 are formed in the four corners to guide the coil to be wound.

In the figure, reference numeral 33 is an axial insertion hole, and 32 is a guide groove.

When manufacturing the optical pickup of the optical recording and reproducing apparatus of the present invention configured as described above, first, the pickup base 1 is manufactured. As shown in FIG. 3, the substrate holder 10 is disposed on the upper surface of the pickup base 1. And the yoke 7 and the lens holder 3 are injected to form a single body.

The lens holder 3 is positioned above the light entry / exit hole 2 of the pickup base 1, and is connected to the pickup base 1 by connecting portions 40 formed at both ends of the lens holder 3. do. The connecting portion 40 allows the molding material to flow during injection molding so that the lens holder 3 is formed, and is formed as thin as possible.

In such a state, the lower end connecting portion 40 of the lens holder 3 formed on the upper side of the light entrance / exit hole 2 is processed by post processing, so that the lens holder 3 is removed from the pickup base 1 as shown in FIG. Separate.

Each optical part, for example, a mirror (MIRROR), an LD, and the like, are assembled on the lower surface of the pickup base 1 manufactured as described above, and the magnet 8 is bonded to the inner surface of the yoke 7 with an adhesive.

Thereafter, the lens holder 3 is coupled to the insertion hole 21 of the bobbin 5 in which the tracking coil 7 and the focus coil 6 are wound from below, and the lens holder 3 is thus coupled. The bobbin 5 is seated on the upper side of the light entry / exit hole 2 of the pickup base 1.

After connecting and assembling the suspension wires to the four wire connecting portions 23 of the bobbin 5 in the above state, the suspension wires are connected to the printed circuit board 9 fixed to the substrate holder 10, In this state, the bobbin 5 to which the lens holder 3 is coupled is in a state of being positioned above the light entry / exit hole 2 formed in the pickup base 1 while being supported by the suspension wire.

In such a state, assembling of the pick-up part is completed by mounting and fixing the objective lens 4 to the lens seating part 3a of the lens holder 3 using a separate tool.

As described in detail above, in the optical pickup manufacturing method of the optical recorder according to the present invention, the substrate holder for fixing the printed circuit board, the yoke and the lens holder are integrally injected at the time of manufacturing the pickup base, and the lens holder is separated by post processing. By manufacturing parts in a method, and manufacturing several parts by one injection and forming some parts integrally in the pick-up base, the manufacturing cost is reduced according to the reduction of manufacturing labor and assembly labor. As it is simplified, cumulative assembly errors are reduced, thereby improving the quality of the final product.

Claims (3)

In the method for manufacturing the optical pickup of the optical recorder, On the upper surface of the pickup base, the substrate holder to which the printed circuit board is fixed and the lens holder to which the objective lens is coupled are integrally formed. The optical pickup manufacturing method of the optical recording and reproducing, characterized in that to proceed in the order of separating the lens holder by post processing. The method of claim 1, wherein the pickup base is formed by injection. The optical pickup manufacturing method according to claim 1 or 2, wherein a yoke to which a magnet is attached is formed integrally on an upper surface of the pickup base.