KR900004608Y1 - Tracking device in optical pickup - Google Patents

Abstract

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Description

Optical pickup tracking device

1 is a cross-sectional view showing the configuration of a conventional device.

Figure 2a, b is an operating state of the lens arm and the rubber damper showing the tracking process and the restoration process in the conventional device.

3 is a cross-sectional view showing the configuration of the device of the present invention.

4 is a plan view of the same.

5a and b show the operation of the device of the present invention, (a) shows the tracking process and (b) shows the restoration process.

* Explanation of symbols for main parts of the drawings

32: drive base 33: yoke

34: magnet 35: magnet plate

36: bobbin 37: focus driving coil

38: tracking driving coil 40: lens arm

41: support 42,42 ': rubber damper

The present invention relates to a tracking device for an optical pickup, and in particular, a compact disc player and a video disc player optical filing which enables reliable operation by lowering the overall height of the optical pickup assembly and lowering the load on the tracking member by the rubber damper. A tracking device for optical pickup used in a system.

The conventional apparatus is characterized in that the drive base 2 extends to the base 1 and the yoke 3 is fixed thereto and the magnet 4 is fixed to the yoke 3 as shown in FIGS. 1 and 2a and b. And the magnet plate 5 are fixed, the bobbin 6 is fixed on the magnet plate 5, the focus driving coil 7 and the tracking driving coil 8 are wound around the magnet plate 5, and the bobbin 6 On the upper surface, the lens arm 10 having the objective lens 9 installed therein is fixed. In addition, a cylindrical rubber damper 12 is bonded to the upper surface of the bobbin 6 to which the lens arm 10 is fixed between the bottom surface of the support cap 11 fixed to the driving unit base 2.

As described above, in the tracking device of the optical pickup, the magnetic flux by the magnet 4 flows in the space between the yoke 3 and the magnetic plate 5, and the focus driving coil 7 and the tracking driving coil are located within the magnetic flux. There is a (8), and when a current flows through them, a force is generated to enable the focus drive and the tracking drive of the lens arm 10. At this time, the cylindrical rubber damper 12 serves to restore the original position if the displacement of the focusing drive or tracking drive of the lens arm 10 reaches a certain range.

2A and 2B show a tracking process and a restoration process of such a conventional optical pickup tracking device, which are tracked along the track of the disk 13 (FIG. 1) while being rotated under the force of the tracking driving coil 8. After some rotation, the torsion restoring force of the cylindrical rubber damper 12 is restored to its original position.

However, in the apparatus of the prior art, by using the cylindrical rubber damper 12, a large amount of force is required during focus driving or tracking driving, and an overload is applied, and the height is relatively high to obtain a proper torsional restoring force. Since the adhesive is bonded between the bobbins 6), the precision or reliability of the operation is degraded.

In the present invention, it is conceived in view of such a point of the prior art, and the reliable operation is achieved by lowering the overall height of the optical pickup assembly and lowering the load on the tracking member, based on the accompanying drawings. When described in more detail as follows.

As shown in FIGS. 3 to 5, the driving unit base 32 extends to the base 31, the yoke 33 is fixed thereto, and the magnet 34 and the magnet plate 35 are fixed to the yoke 33. Is fixed, the bobbin 36 is fixed on the magnet plate 35, the focus driving coil 37 and the tracking driving coil 38 is wound around the outer periphery of the bobbin 36, the objective lens 39 In the case where the lens arm 40 is fixed and the support 41 is fixed adjacent to the yoke 33, two rubber dampers 42 parallel between the support 41 and the bobbin 36. (42 ') is a structure in which the reference numeral 43 denotes a disk.

The tracking device of the optical pickup according to the present invention configured as described above has a magnetic flux flowing by the magnet 34 in the space between the yoke 33 and the magnetic plate 35 as in the conventional case, and focusing coils in the magnetic flux ( 37) and a current flows through the tracking driving coil 38 to generate a force, thereby performing focus driving and tracking driving of the lens arm 40.

At this time, the two rubber dampers (42, 42 ') on the plate is easily deformed up and down during focus driving, and the required force is greatly reduced, and during tracking, the tracking driving rubber dampers (42') or (42) are contracted and The rubber damper 42 or 42 'on the opposite side is extended, and when the tracking driving force is lost, the rubber damper 42 or 42' can be stably and quickly restored to its original position by the damping action of the rubber dampers 42 and 42 'which have been extended or contracted.

In the optical pickup tracking device of the present invention, since two rubber dampers having parallel rods are used, the support height of the rubber damper can be significantly lowered, and the overall height can be relatively reduced. There is an advantage that can be given.

Claims (1)

In the tracking device for optical packup in which the lens arm 40 is driven by the action of the magnet 34 fixed to the driving base 32 and the focusing and tracking driving coils 37 and 38 fixed to the bobbin 36. And two parallel rubber dampers 42 and 42 'for restoring the lens arm 40 between the support base 41 fixed to a predetermined height on one side of the upper surface of the driving base 32 and the bobbin 36. Tracking device of the optical pickup, characterized in that the configuration by connecting.