KR19980038682A - Axial press-fit device of optical pickup actuator for DVD - Google Patents

Abstract

The present invention relates to a shaft indentation apparatus of the optical pickup actuator for the DVD, in particular, the base 50 is formed with a settling groove 52 in which the bottom portion of the yoke plate 110 is placed, and the settling groove of the pedestal 50 ( 52, the pressing plate 100 formed in the center of the shaft guide hole 92 for guiding the movement of the perturbation shaft 120 fitted in the fitting hole 112 of the yoke plate 110, and the pressing plate 100 Guide shaft 90 of the base 50 is fixed to both sides so as to guide the movement of the pressing plate 100 is inserted into the guide hole 102 of the) and the guide shaft 90 A guide hole 84 is formed and presses the perturbation shaft 120 fitted into the shaft guide hole 92 of the pressing plate 100 to press the upper and lower pressing plates 80 into the fitting holes 112 of the yoke plate 110. And a pressing member 70 fixed to one side of the upper and lower pressing plates 80 to move the upper and lower pressing plates 80 up and down, and the pressing member. The axis of the optical pickup actuator for DVD, characterized in that consisting of a support 60 formed with an upper and lower moving grooves 62 for guiding the movement of the upper and lower pressing plate 80 to move up and down by the member 70. It is a very useful and effective invention to improve the assembly and productivity by press-fitting the press-fit device inva, the shaft perturbation shaft to the yoke plate quickly and accurately.

Description

Axial press-fit device of optical pickup actuator for DVD

The present invention relates to a perturbation shaft of an optical pickup actuator for a DVD, and in particular, a perturbation shaft inserted into the center of the yoke plate and guiding the movement of the objective lens holder is inserted into an axial guide hole formed in the center of the pressing plate to press The optical fiber for DVD that presses the perturbation shaft with the upper and lower pressing plate operated by the member to press and fix it to the fitting hole of the yoke plate placed in the settling groove of the pedestal to improve the assembly and productivity of the perturbation shaft. A axial press-fit device of a pickup actuator.

In general, an optical pickup actuator is installed in a vertical portion below a disc, which is an optical recording medium of various optical disc players, such as a mini disc player (MDP), a compact disc player (CDP), or a laser disc player (LDP). While moving, it detects the desired track position on the disc. At the detected track position, laser light is incident on the pit recorded on the disc surface, and then the reflected light is detected through an optical system. It is a device to play content.

As such, as optical technology gradually develops, optical reproducing technology, which compresses only a voice signal to a thin round plate CD and plays it with a CD player and provides clean sound quality instead of a tape, simultaneously reproduces a video signal and a voice signal. The technology has gradually increased with the introduction of laser disc players, and recently, digital video discs (DVDs), which can be played on a TV in the home by compressing video and audio signals on CD-sized boards, are called DVDs. ), The DVD technology was put into practical use, and the standardization of the DVD technology was decided, and a product for commercialization will be developed and manufactured in earnest.

On the other hand, the optical pickup actuator for the DVD is manufactured so that both the CD and the DVD lens can be reproduced at the same time, a wire type optical pickup actuator using a wire, a hinge type optical pickup actuator using a hinge Coaxial perturbation optical pickup actuators have been used, and according to some known techniques, it is known by the technical literature that the axial perturbation method is used as the optical pickup actuator for the main DVD, and therefore the CD and the DVD of the axial perturbation method are therefore known. Let's take a look at the configuration of the combined optical pickup actuator.

First, as shown in FIGS. 1 and 2. A laser passing hole is formed on the disk to focus the laser light, and the focusing is fixed to each other at a position symmetrically perpendicular to a predetermined position of the yoke plate 10 and the yoke plate 10 to form a bottom surface, and Tracking yoke 15, 14, Focusing magnet 16 fixedly installed on the inner surface of the focusing yoke 15 to generate magnetic force, and fixedly installed on the inner surface of the tracking yoke 14 to generate magnetic force. Tracking magnet 18, a perturbation shaft 19 of precision machining which is fixedly installed at the center of the yoke plate 10 by insert molding, and a guide hole 26 formed at the center of the perturbation shaft 19. ) And the first and second lens settled holes 22 and 23 having different sizes penetrating up and down so as to be positioned on the laser through hole 12 at one side of the guide hole 26 and the first 1 is fixed to the lens anchor hole (22) CD lens 32 for focusing the laser light, the DVD lens 30 is placed in the second lens settling 23 to focus the laser light on the DVD disk, and the outer peripheral surface of the objective lens holder 20 A tracking adjustment coil 29 which is attached to the tracking magnet 18 installed in the tracking yoke 14 to control the movement in the rotational direction and the radial direction, and the bottom surface of the objective lens holder 20. Focusing adjustment coil 28 is installed on the outer circumferential surface of the fixed shaft 27 protruding to generate a magnetic force between the focusing magnet 16 fixed to the focusing yoke 15 to control the operation in the optical axis direction And a coil PC 34 installed on an upper surface of the objective lens holder 20 to electrically connect the flexible PC 36 to the focusing adjustment coil 28 and the tracking adjustment coil 29.

On the other hand, fixing the damping of the holder holder of the metal material is fitted into the groove 24 recessed to the inner surface of the objective lens holder 20 on the inner surface where the tracking adjustment coil 29 is installed on the outer peripheral surface of the objective lens holder 20 Four iron pieces 33 are installed so that the objective adjustment holder 29 is temporarily mounted on the tracking adjustment coil 29 to rotate the objective lens holder 20 about the perturbation shaft 19 so that the objective lens holder 20 can be used for CD and DVD. A large current flows to switch between the CD and the DVD, and to hold the inertial force of the objective lens holder rotating with the fixed iron piece 33 for holder damping.

Referring to the operation of the perturbation optical pickup actuator configured in this way as follows.

As shown in Figs. 1 and 2, the focusing and tracking states of the laser beam recording pits are detected by a photo detector on an optical system. In this case, when calibration is necessary as a result of detecting the focusing and tracking states, the servo system transmits an electrical signal to the flexible PC 36. At this time, the current is energized by the flexible PC 36 and the coil PC 34 fixed to each other by soldering, and the current flows through the focusing adjusting coil 28 and the tracking adjusting coil 29 connected to the coil PC 34. The focusing adjustment coil 28 and tracking adjustment due to the magnetic force by the focusing magnet 16 and the tracking magnet 18 fixed to the focusing yoke 15 and the tracking yoke 14 of the yoke plate 10. The coil 29 is subjected to Lorentz driving force.

As described above, as the focusing adjustment coil 28 and the tracking adjustment coil 29 receive the Lorentz driving force, the objective lens holder 20 holding the adjustment coils 28 and 29 also receives the Lorentz driving force. Along the perturbation shaft 19 fixed to the oak plate 10, the objective lens holder 20 adjusts the focus on the disk while operating in the focusing direction, that is, the up and down directions, and the objective lens holder 20 is also the perturbation shaft. As it rotates with respect to (19), it rotates in the tracking adjustment direction, that is, the rotation direction, to perform the radial direction operation.

However, the above-mentioned axial perturbation optical pickup actuator has a guide hole formed by penetrating up and down in the center of the objective lens holder in the perturbation shaft which is fixedly installed in the center of the yoke plate by insert molding. When the Lorentz driving force is applied by the coil and the tracking adjustment coil, the objective holder guides the movement of the objective lens holder so that the objective lens holder can operate in the up and down direction or in the rotational direction. As the guide of the objective lens holder is operated as frequently as the number of times, the processing precision should be manufactured very precisely, and the guide hole of the objective lens holder fitted to the perturbation shaft 19 is also processed very precisely, thereby increasing the unit cost and assembling. The process is so complex that actuator assembly and productivity are significantly lower Ha had a problem.

The present invention has been made in view of the above, and the perturbation shaft inserted in the center of the yoke plate to guide the movement of the objective lens holder is inserted into the shaft guide hole formed in the center of the pressing plate and operated by the press member. The purpose is to improve the assembly and productivity of the perturbation shaft by pressing the perturbation shaft with upper and lower pressing plates to press and fix the perturbation shaft to the fitting hole of the yoke plate placed in the base groove of the pedestal.

This purpose is to be fitted in the perturbation shaft fitted in the fitting hole of the yoke plate, the base is formed with a settling groove in which the bottom portion of the yoke plate is placed, and the fit hole of the yoke plate settled in the settling groove of the pedestal. A guide plate having a shaft guide hole for guiding the movement of the perturbation shaft, a guide shaft fixed to both sides of the guide groove fixed to both sides so as to guide the movement of the pressure plate by being inserted into the guide hole of the pressing plate, and a guide fitted to the guide shaft A ball is formed to press the perturbation shaft inserted into the shaft guide hole of the pressing plate, and the upper and lower pressing plates are pressed into the fitting holes of the yoke plate, and fixed to one side of the upper and lower pressing plates to move the upper and lower pressing plates upward and downward. The support member is formed, and the support member is formed by the pressing member and the upper and lower moving grooves for guiding the movement of the upper and lower pressing plates which move up and down by the pressing member. It is a characteristic which is achieved by providing the axial press-in apparatus of the optical pickup actuator for DVD which is comprised.

1 is an exploded perspective view of a general axis perturbation optical pickup actuator.

Figure 2 is a perspective view of the combined state of the conventional axis perturbation optical pickup actuator.

Figure 3 is an exploded perspective view of the axial indentation device of the optical pickup actuator for DVD according to the present invention.

Figure 4 is a perspective view of the coupling state of the shaft pressing device of the optical pickup actuator for DVD according to the present invention.

5 is a view showing a state of use of the shaft pressing device of the optical pickup actuator for DVD according to the present invention.

* Explanation of symbols for main parts of the drawings

50: pedestal 52: settling groove

60: support 70: pressing member

80: upper and lower pressing plate 82: fixing bolt

84: guide ball 90: guide shaft

92: shaft guide hole 100: pressing plate

103: spring 110: yoke plate

120: perturbation shaft

3 to 5, the configuration of the present invention, in the perturbation shaft 120 that is fitted to the fitting hole 112 of the yoke plate 110, the bottom portion of the yoke plate 110 is settled Movement of the perturbation shaft 120 fitted into the pedestal 50 having the settling groove 52 formed therein, and the fitting hole 112 of the yoke plate 110 placed in the settling groove 52 of the pedestal 50. Shaft guide hole (92) for guiding the pressing plate 100 formed in the center and the guide hole 102 of the pressing plate 100 is inserted into the guide groove of the base plate 50 to guide the movement of the pressing plate (100) A guide shaft 90 fixed to both sides and a guide hole 84 fitted to the guide shaft 90 are formed to form the perturbation shaft 120 fitted into the shaft guide hole 92 of the pressing plate 100. It is fixed to one side of the upper and lower pressing plate 80 and the upper and lower pressing plate 80 pressed into the fitting hole 112 of the yoke plate 110 by pressing the upper and lower pressing plate 80 up and down to It consists of a pressing member 70 to be moved, and a support 60 having upper and lower moving grooves 62 for guiding the movement of the upper and lower pressing plates 80 that are moved up and down by the pressing member 70. do.

And, the upper and lower pressing plate 80 is fastened to the upper end of the guide shaft 90 is fixed by the fixing bolt 82 to prevent the separation of the upper and lower pressing plate 80 The perturbation shaft 120 is inserted into the shaft guide hole 92 formed in the central portion of the pressing plate 100 by pressing the perturbation shaft 120 inserted into the center of the plate 110 to guide the movement of the objective lens holder. Pressing the perturbation shaft 120 with the upper and lower pressing plate 80 operated by the pressing to the fitting hole 112 of the yoke plate 110 placed in the settling groove 52 of the pedestal 50 is fixed. It is configured to improve the assembly and productivity of the perturbation shaft 120 by installing.

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

First, look at the state of use of the axial press-fit device of the optical pickup actuator for DVD, first, the yoke plate 110 is placed in the settling groove 52 of the pedestal 50, and the perturbation shaft 120 is pressed plate 100 When the pressing member 70 is operated after being inserted into the shaft guide hole 92 of), the upper and lower pressing plates 80 are moved downward along the upper and lower moving grooves 62 of the support 60. The upper and lower pressing plate 80 is guided by the guide shaft 90 to force the upper surface of the pressing plate 100, the pressing plate 100 is also moved to the lower side as well.

In this way, as the spring 103 is compressed while being pressed by the lower side of the pressing plate 100, the perturbation shaft 120 fitted into the shaft guide hole 92 is inserted into the fitting hole 112 of the yoke plate 110. It is fixed while being forcibly inserted.

On the other hand, after the perturbation shaft 120 is fitted into the fitting hole 112 of the yoke plate 110, the pressing member 70 is operated in reverse again, and the upper and lower pressing plates 80 are returned to their original state, and the pressing plate 100 is moved to the original by the force of the spring 103, after the pressing plate 100 is moved so that the perturbation shaft 120 is fitted to the fitting hole 112 of the yoke plate 110. Then, the above-described operation is repeated to fit the perturbation shaft 120 to the fitting hole 112 of the yoke plate 110.

Therefore, when the axial press-fit device of the optical pickup actuator for DVD according to the present invention is used, the perturbation shaft is inserted into the center of the yoke plate to guide the movement of the objective lens holder. Press the perturbation shaft with the upper and lower pressing plate operated by the press member, and press and fix it to the fitting hole of the yoke plate placed in the base groove of the pedestal to improve the assembly and productivity of the perturbation shaft. It is a very useful and effective invention.

Claims (2)

In the perturbation shaft 120 fitted into the fitting hole 112 of the yoke plate 110, a pedestal 50 having a settling groove 52 in which the bottom portion of the yoke plate 110 is placed, and the pedestal 50 Press plate 100 formed in the center of the shaft guide hole 92 for guiding the movement of the perturbation shaft 120 fitted in the fitting hole 112 of the yoke plate 110 placed in the settled groove 52 of the 50 ), Guide shafts 90 of which the fixing grooves 52 of the pedestal 50 are fixed to both sides so as to be inserted into the guide holes 102 of the pressing plate 100 to guide the movement of the pressing plate 100, and the guides. A guide hole 84 fitted to the shaft 90 is formed to press the perturbation shaft 120 fitted into the shaft guide hole 92 of the pressing plate 100 to press-fit the fitting hole 112 of the yoke plate 110. A pressing member 70 which is fixed to one side of the upper and lower pressing plate 80 and the upper and lower pressing plate 80 to move the upper and lower pressing plate 80 up and down, and the pressing member 7 Axial press-fit device of the optical pickup actuator for DVD, characterized in that consisting of a support 60 formed with an up and down moving grooves 62 for guiding the movement of the up and down pressing plate 80 moving up and down by 0) . According to claim 1, wherein the upper and lower pressing plate 80 is fastened to the upper end of the guide shaft 90 is fixed by a fixing bolt 82 to prevent the separation of the upper and lower pressing plate (80). Pressing the perturbation shaft 120 into the shaft guide hole 92 formed in the center of the pressing plate 100 is inserted into the center of the yoke plate 110 to guide the movement of the objective lens holder. Pressing the perturbation shaft 120 with the upper and lower pressing plates 80 operated by the member 70 to fit the yoke plate 110 seated in the settling groove 52 of the pedestal 50. A shaft press-fitting device of an optical pickup actuator for a DVD, which is to be fixed to the assembly to improve the assembly and productivity of the perturbation shaft (120).