KR19990041881A - Rotary Shaft Assembly Device for Optical Pickup Actuator - Google Patents

Abstract

The present invention is to improve the quality and assembly productivity of the damp sliding actuator by providing a device for assembling the rotary shaft exactly perpendicular to the yoke in the manufacturing process of the damp sliding actuator.

The present invention has a shaft hole 26 for inserting the rotary shaft 50 and the fixed shelf 20 formed in the center of the support plate 24 is inserted into the yoke 40, and the yoke coupled to the rotary shaft 50 The pressing lathe 18 which formed the crimping plate 14 which presses the upper surface of the 40 at the center, the moving lathe 10 which fixed the said pressing lathe 18 to the center, and the said moving lathe 10 up and down It consists of a pressure generating means (60) for conveying the rotary shaft 50 is inserted into the shaft hole (26) formed in the support plate 24 of the fixed shelf 20, and vertically fixed to the movable shelf (10) By lowering and pressing the yoke 40 by the crimping shelf 18, the rotating shaft 50 can be fixed exactly vertically.

Description

Rotary Shaft Assembly Device for Optical Pickup Actuator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft assembling apparatus for an optical pickup actuator, and in particular, an optical pickup in which a rotating shaft is fixed perpendicularly to the yoke by pressing the yoke with a moving shelf that is fixed to the fixed shelf and moved up and down by a pressure generating means. It relates to a rotating shaft assembly device for the actuator.

In general, an optical pickup device is installed on a deck of a player for playing a compact disc, and irradiates laser light to the recording pit of the disc, converts the light reflected from the recording pit into an electrical signal, and transmits the signal to the signal processor. A hologram element with a built-in laser diode for irradiating light and a photodiode for converting reflected light into an electrical signal, and an objective lens for focusing the laser light irradiated from the laser diode of the hologram element to focus on the recording pit of the disc. It is provided.

When the focus error and the radial direction error occur in the focus of the laser light formed on the recording pit of the disk in the objective lens of the optical pickup apparatus, the objective lens is moved in the radial direction and the optical axis direction to correct the error. It is the actuator to correct the error of the laser light focus by adjusting the position in the recording pit track.

Among the actuators, the lens holder fixing the objective lens rotates and rotates up and down about the rotation axis, and the axial sliding actuator shown in FIG. 1 includes the objective lens 112 and the CD for the lens holder 110 in the lens holder 110. The objective lens 114 is fixed, and the lens holder 110 is coupled to the rotation shaft 138 formed on the yoke 130 so as to be movable.

The axial sliding actuator is provided with one hologram element below, and the lens holder 110 is rotated and rotated up and down about the rotation axis 138, the objective lens 112 for the CD fixed to the lens holder 110 Alternatively, the objective lens 114 for DVD is selectively positioned on the optical path of the hologram element, so that the CD or DVD is selectively reproduced by one hologram element.

On the other hand, the structure for driving the lens holder 110 of the axial sliding actuator, first fixed to the rotating shaft 138 processed to minimize the friction force on the yoke 130, the lens holder 110 is almost without friction the rotating shaft ( 138 to rotate or slide up and down, and the inner surface of the yoke 130, the magnet 134 magnetized up and down and the magnet 136 magnetized to the left and right alternately fixed, the lens holder 110 At the side of the), two winding coils 120 are attached to respective positions corresponding to the magnets 134 and 136 to generate the electromagnetic force by the magnetic flux of the magnets 134 and 136 to drive the lens holder 110.

The magnet 136 having the polarity divided left and right in the above is arranged at intervals of 180 degrees so that the electromagnetic force is generated in the left and right directions in the winding coil 120 applied by the magnetic flux of the magnet 136, thereby providing the objective lens 112 for the CD. ) And the lens holder 110 is rotated in the tracking direction when the tracking error occurs at the focus of the laser light formed by the objective lens 114 for the DVD. In addition, the magnet 134 having the polarity divided up and down is also arranged at intervals of 180 degrees, so that the electromagnetic force is generated in the vertical direction in the winding coil 120 applied by the magnetic flux of the magnet 134, thereby providing the objective lens 112 for the CD. And when a focus error occurs in the focus of the laser light formed by the objective lens 114 for the DVD, the lens holder 110 is moved in the optical axis direction to correct the error.

When the position of the CD objective lens 112 and the DVD objective lens 114 fixed to the lens holder 110, the winding coil 120 receives the magnetic flux of the magnet 136 is divided into polarity from side to side A large current flows instantaneously to rotate the lens holder 110 to a large width, thereby switching the positions of the CD objective lens 112 and the DVD objective lens 114.

In addition, the four magnetic bodies 116 are fixed to the rear lens holder 110 of the winding coil 120 to lift the lens holder 110 to a predetermined height by a force attracted to the magnetic flux of the magnets 134 and 136 so that the lens holder 110 is fixed. It is to act as a suspension to have the resilience of up, down, left and right.

On the other hand, in such a axial sliding actuator, the operation of the lens holder 110 for moving the objective lenses 112 and 114 in the optical axis direction is determined by moving up and down along the rotation shaft 138 according to the fixed state of the rotation shaft 138, The rotating shaft 138 must be fixed vertically precisely.

If the rotation axis 138 is not vertical and tilted, the objective lenses 112 and 114 fixed to the lens holder 110 moving along the rotation axis 138 move up and down to correct the focus error. Positions 112 and 114 move in the tracking direction in proportion to the inclination angle. In this case, since an unwanted tracking error occurs at the focus of the laser light, in order to correct the tracking error, a current must be applied to the winding coil 120 to drive the lens holder 110 again, thereby increasing power consumption and increasing the lens. The driving sensitivity is lowered due to a mismatch between the driving direction of the holder 110 and the guide direction of the rotation shaft 138.

In addition, the tilt of the objective lenses 110 and 112 according to the tilt occurring on the rotating shaft 138 increases the amount of optical aberration, thereby degrading pickup characteristics.

Therefore, fixing the rotation shaft 138 exactly perpendicular to the yoke 30 is a very important technical task in the manufacture of the axial sliding actuator.

The present invention is to achieve the above technical problem, to provide a device for assembling the rotation axis exactly perpendicular to the yoke in the manufacturing process of the axial sliding actuator to improve the quality and assembly productivity of the axial sliding actuator.

1 is a perspective view showing a typical damping motion optical pickup actuator.

Figure 2 is a sectional view showing a rotating shaft assembly apparatus according to the present invention.

Figure 3 is a perspective view of a rotating shaft assembly according to the present invention.

<Explanation of symbols for main parts of drawing>

10: moving shelf 12: guide rod

14: pressing plate 16: guide groove

18: crimping lathe 20: fixed lathe

22: guide groove 24: support plate

26: shaft hole 28: screw hole

30: ball plunger 32: support rod

34: seating groove 40: yoke

50: rotation axis 60: pressure generating means

The present invention is a device for assembling the rotating shaft to the yoke of the axial sliding optical pickup actuator, the fixing shelf having a shaft hole for inserting the rotating shaft and formed around the support plate inserted into the yoke, and the upper surface of the yoke coupled to the rotating shaft It is composed of a pressing lathe formed at the center of the pressing plate to pressurize, a moving lathe fixing the pressing lathe at the center, and pressure generating means for transferring the moving lathe up and down.

When the rotary shaft is fixed to the yoke using such a rotary shaft assembly device, the rotary shaft is inserted into the shaft hole formed in the support plate of the fixed shelf to be vertically fixed and the pressure is generated while the inner bottom of the yoke is positioned at the center of the upper surface of the rotary shaft. By lowering the movable lathe by means and pressing the yoke with the crimping lathe, the rotating shaft can be fixed exactly perpendicularly to the yoke.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a rotating shaft assembly device for an optical pickup actuator according to the present invention will be described in detail.

This embodiment is intended for use as a device for assembling a rotating shaft at the center of the yoke in the manufacturing process of the axial sliding optical pickup actuator.

As shown in Figs. 2 and 3, the fixed shelf 20 having a shaft hole 26 for inserting the rotation shaft 50 and the center of the support plate 24 is inserted into the yoke 40 And a pressing lathe 18 formed at the center of the pressing plate 14 for pressing the upper surface of the yoke 40 coupled to the rotary shaft 50, and a moving lathe 10 fixing the pressing lathe 18 at the center. ), And a pressure generating means 60 for conveying the moving shelf 10 up and down.

At the center of the fixing shelf 20 is inserted and fixed from the bottom support rod 32 formed with a seating groove 34 for inserting the bottom surface of the rotation shaft 50. In addition, the support plate 24 of the fixed shelf 20 is formed with a screw hole 28 communicating with the shaft hole 26 in the horizontal direction, and the rotating shaft 50 inserted into the shaft hole 26 is brought into close contact with one side of the rotating shaft ( Insert the ball plunger 30 into the screw hole 28 so that 50 is fixed vertically.

In addition, the yoke 40 is formed at the center of the pressing plate 14 of the pressing lathe 18 to guide the yoke 40 protruding toward the center of the bottom of the yoke 40 and the guide groove 16 for guiding the protrusion of the rotation shaft 50. The protrusion shape of the yoke 40 protruding to the bottom of the 40 and the protrusion length of the rotation shaft 50 are limited.

In addition, guide grooves 22 are formed on both sides of the support plate 24 of the fixed shelf 20, and the movable shelf 10 includes guide bars 12 inserted into the guide grooves 22, thereby providing a movable shelf ( 10) and the pressing shelf 18 fixed to the moving shelf 10 does not flow left and right so that the rotary shaft 50 is accurately inserted in the center of the guide groove 16 of the pressing plate 14. .

Hereinafter, the operation of the rotating shaft assembly device having the configuration as described above.

When assembling the rotary shaft 50 to the yoke 40, first, the rotary shaft 50 is inserted into the shaft hole 26 formed in the support plate 24 of the fixed shelf 20 so as to be inserted into the fixed shelf 20. The bottom surface of the rotating shaft 50 is inserted into the seating groove 34 of the. Then, the ball plunger 30 inserted into the screw hole 28 of the support plate 24 pushes the rotation shaft 50 to one side, and the rotation shaft 50 is exactly vertically fixed.

In this state, the through hole 42 formed in the bottom center of the yoke 40 is inverted so that the yoke 40 is covered with the upper surface of the rotation shaft 50 to cover the rotation shaft 50, and the support plate 24 of the fixed shelf 20 is provided. ) The through hole 42 is formed in advance in order to assemble the rotating shaft 50, the size is smaller than the radius of the rotating shaft 50, when the rotary shaft 50 is pressed in to form a protrusion on the bottom surface of the yoke 40 The rotation shaft 50 is inserted.

When the rotating shaft 50 and the yoke 40 are fixed to the fixed shelf 20 as described above, the pressure generating means 60 is operated to move the movable lathe 10 and the pressing lathe 18 fixed to the movable lathe 10. Down). Accordingly, the guide rod 12 formed downward in the movable shelf 10 is inserted into the guide groove 22 formed in the fixed shelf 20 so that the movable shelf 10 and the pressing shelf 18 flow from side to side. To prevent flow only up and down.

As described above, when the moving shelf 10 and the pressing shelf 18 descend, the pressing plate 14 formed on the pressing shelf 18 compresses the bottom surface of the yoke 40. Accordingly, the rotation shaft 50 is pressed into the through hole 42 formed in the center of the yoke 40 and expands the through hole 42.

Accordingly, the rotation shaft 50 protrudes upward from the bottom of the yoke 40, that is, from the current state to form a protrusion upward. The protrusion of the yoke 40 or the rotating shaft 50 is inserted into the guide groove 16 of the pressing plate 14 located on the upper side to determine the shape of the protrusion of the yoke 40, and the rotating shaft 50 has a predetermined length. The abnormal yoke 40 does not protrude upward. Accordingly, the rotation shaft 50 coupled to the yoke 40 is in a state of being vertically fixed.

When the rotating shaft 50 is assembled to the through hole 42 of the yoke 40 in this manner, the pressure generating means 60 is operated to raise the movable lathe 10. As a result, the pressing shelf 18 fixed to the moving shelf 10 rises together, and the guide rod 12 formed on the moving shelf 10 is separated from the guide groove 22 of the fixed shelf 20. In addition, the guide groove 16 of the pressing plate 14 into which the protrusion of the yoke 40 and the protrusion of the rotary shaft 50 are inserted also rises and is separated from the yoke 40.

Then, the yoke 40 coupled to the support plate 24 of the fixed shelf 20 and the rotating shaft 50 inserted into the shaft hole 26 of the support plate 24 and coupled to the yoke 40 simultaneously fix the shelf 20 ).

As described in the above embodiment, the present invention is a device for assembling the rotating shaft 50 to the yoke 40 of the axial sliding optical pickup actuator, having a shaft hole 26 for inserting the rotating shaft 50 and the yoke 40 ) The fixed shelf 20 formed at the center of the support plate 24 inserted into the center) and the compression plate 14 formed at the center of the pressing plate 14 for pressing the upper surface of the yoke 40 coupled to the rotary shaft 50. It consists of the shelf 18, the moving shelf 10 which fixed the crimping shelf 18 to the center, and the pressure generating means 60 which conveys the said moving shelf 10 up and down, and fixes the rotating shaft 50. The pressure generating means 60 is inserted into the shaft hole 26 formed in the support plate 24 of the shelf 20 so as to be vertically fixed, and the inner bottom surface of the yoke 40 is positioned at the center of the upper surface of the rotation shaft 50. By lowering the movable lathe 10 by pressing the yoke 40 with the crimping lathe 18, the rotating shaft 50 is moved to It can be presented. Therefore, by using the assembly device for rotating shaft 50 according to the present invention, since the operation of fixing the rotating shaft 50 to the yoke 40 exactly vertically can be continuously performed, there is an effect that can produce a large amount of axial sliding actuator. .

Claims (5)

In the apparatus for assembling the rotating shaft 50 to the yoke 40 of the axial sliding optical pickup actuator, A fixed shelf 20 having a shaft hole 26 for inserting the rotation shaft 50 and having a support plate 24 inserted into the yoke 40 at the center thereof, and a yoke 40 coupled to the rotation shaft 50. Pressing plate 18 formed at the center of the pressing plate 14 for pressing the upper surface of the center, the moving shelf 10 fixed to the center of the pressing shelf 18, and the moving shelf 10 is transported up and down Rotary shaft assembly device for an optical pickup actuator, characterized in that consisting of a pressure generating means (60). The rotating shaft assembly apparatus of claim 1, wherein a supporting rod 32 is formed at a center of the fixed shelf 20 to form a seating groove 34 into which the bottom surface of the rotating shaft 50 is inserted. . According to claim 1, wherein the support plate 24 of the fixed lathe 20 is formed with a screw hole 28 in communication with the shaft hole 26 in the horizontal direction, the ball plunger 30 in the screw hole 28 Rotating shaft assembly apparatus for an optical pickup actuator, characterized in that for close contact with the rotation shaft 50 is inserted into the shaft hole 26 to one side. The guide groove (16) for guiding the yoke (40) and the projection of the rotary shaft (50) protruding toward the center of the bottom surface of the yoke (40) at the center of the pressing plate (14) of the pressing shelf (18). Rotary shaft assembly apparatus for an optical pickup actuator, characterized in that formed. According to claim 1, Guide grooves 22 are formed on both sides of the support plate 24 of the fixed shelf 20, and the guide bar 12 is inserted into the guide groove 22 in the movable shelf (10). Rotary shaft assembly apparatus for an optical pickup actuator, characterized in that.