KR19980062789U - Optical recording-actuators in playback equipment - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to an actuator of an optical recording-reproducing apparatus.

I. The technical problem that the invention is trying to solve.

An object of the present invention is to provide an actuator of an optical recording-reproducing apparatus provided with a damper capable of preventing rotation and negative resonance of the movable portion.

All. The gist of the solution of the invention.

The present invention is characterized in that in the actuator of the optical recording-reproducing apparatus, the holder is provided with stepped damper grooves on both sides fixing the leaf spring, and a damper is provided in the damper groove.

la. Important uses of the devise.

The present invention is used in the movable portion of the optical recording-reproducing apparatus.

Description

Actuator of optical record-playback device

The present invention relates to an actuator of a leaf spring type, which is a position tracking mechanism of an optical recording / reproducing apparatus, and more particularly to an actuator provided with a damper between a leaf spring and a holder.

In general, in an optical recording-reproducing apparatus using an optical disc as a recording medium, an optical pickup is used when reading or recording a signal recorded on the optical disc, and the optical pickup is an actuator for driving an objective lens that focuses the disk. It includes. Actuator needs the ability to follow the information according to the increase in the rotational speed of the disk, the information is stored. Recently, various optical recording-reproducing apparatus has become high speed, and as the rotational speed of the disk increases, the access needs of the actuator (Access) The time has also been greatly shortened (eg 150 msec at 1/3 stroke at 8x), which also requires more precise tracking of the objective lens. In order to shorten the access time and precise position tracking as described above, the actuator has to have very high damping performance (uniform damping value maintenance, no rotation or non-resonance) to satisfy the above requirements.

Meanwhile, a configuration of an actuator of a conventional optical pickup will be described with reference to FIG. 1.

The actuator 50 has an objective lens 54 for accurately confining a laser beam to a disk, and reads information stored on the disk, a bobbin 60 for supporting and fixing the objective lens, and a wound on an outer surface of the bobbin. Focus coil 58, track coils 59 wound around front and rear surfaces of the bobbin, magnets 64 for applying current to the focus coils and track coils, and electromotive force generated in the magnets in one direction The yoke 62 and the holder 52 provided in the outer side of the said yoke are comprised. In particular, the movable lens 56 is collectively referred to as the objective lens, bobbin, focus coil, and track coil. In addition, a two-piece integrated leaf spring 20 as shown in FIG. 2 is installed between the holder and the movable portion, and a damper is formed in the leaf spring to increase damping action and rotational rigidity of the movable portion. In addition, holes 21 and 22 are formed at both ends of the leaf springs, and projections for engaging the leaf springs and the holders and the leaf springs and the movable parts are respectively formed. And, an actuator cover is added to protect the upper and both sides of the actuator having the above configuration.

In the actuator having the above configuration, the bobbin can be vertically moved by the focus coil by applying current to the magnet, and the bobbin can be moved horizontally (radial direction of the disc) by the track coil. In addition, the laser beam passes through the objective lens supported by the movable part including the bobbin to read the information stored in the disk. At this time, the two-piece integrated leaf spring having a damper is supported by the movable portion to perform a damping action in the vertical direction and the horizontal direction. The rotational stiffness of the leaf spring and the mass moment of inertia of the movable portion must be increased to prevent rotation and negative resonance of the movable portion. For this purpose, a damper having a uniform damping value is essential, and the leaf spring in which the damper is installed is an actuator. It enables accurate position tracking and fast access time.

On the other hand, in the initial design of the actuator, the shape of the movable part is determined and the damper formation position and shape of the leaf spring is determined accordingly, and the damping value of the leaf spring with the damper is not widely known, so to design the damping value required for design It is difficult, and once the plate spring is formed a damper has a problem that it is difficult to maintain a uniform damping value because it is difficult to adjust the damping value.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an actuator of an optical recording-reproducing apparatus provided with a damper capable of preventing rotation and negative resonance of a movable part.

Another object of the present invention is to provide an actuator of an optical recording-reproducing apparatus, in which a damping value can be adjusted according to the shape of a movable part, and the damper is easily installed and designed.

In order to achieve the above object, the present invention provides an objective lens to accurately read a laser beam on a disk, a bobbin for supporting and fixing the objective lens, and a focus wound on an outer surface of the bobbin. A coil, a track coil wound around front and rear surfaces of the bobbin, a magnet for applying current to the focus coil and the track coil, a yoke for concentrating electromotive force generated in the magnet in one direction, and an outer side of the yoke. An actuator of an optical recording / reproducing apparatus, in which a leaf spring is fixed between a holder and both sides of the holder and bobbin, wherein the holder is provided with stepped damper grooves on both sides fixing the leaf spring, and a damper in the damper groove. It is characterized by installing.

1 is a perspective view showing the configuration of an actuator of a conventional optical recording-reproducing apparatus;

Figure 2 is a plan view showing a conventional two-piece integrated leaf spring,

3 is an exploded perspective view showing a holder and a damper formed with a damper groove according to a preferred embodiment of the present invention,

Figure 4 is a side view of the holder with a damper according to a preferred embodiment of the present invention,

5 is a side view showing a holder mounted with a leaf spring and a damper according to a preferred embodiment of the present invention,

6 is a perspective view showing an actuator cover according to a preferred embodiment of the present invention,

7 is a cross-sectional view of portion A of FIG. 5 with an actuator cover according to a preferred embodiment of the present invention;

8 is a cross-sectional view of portion B of FIG. 5 with an actuator cover according to a preferred embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

20: leaf spring 30: holder

32: damper groove 40: viscous material damper

41: U-V damper 50: actuator

70: actuator cover 73; projection part

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The actuator of the optical recording-reproducing apparatus is largely composed of a movable part, a holder, a yoke and a leaf spring, and the movable part includes an objective lens, a bobbin, a focus coil and a track coil.

Referring to FIGS. 3 and 4, a holder according to a preferred embodiment of the present invention will be described. On both sides of the holder 30, protrusions 31 are formed to be fitted into holes of the leaf springs, and the sides of the protrusions are respectively formed. A damper groove 32, which is a stepped groove having a square shape, is formed. The damper groove is formed to be stepped to a depth of 0.5 mm compared with the surface on which the protrusion is formed. In addition, a support beam 33 extending from the holder is formed below the holder 30 to secure a space between the holder and the fixed plate so that the movable part can be operated after the plate spring is mounted on the movable part and the holder.

Damper groove formed in the holder is provided with a damper 40 according to a preferred embodiment of the present invention as shown in Figs. The damper is formed of a gel-type viscous material, is formed into a thin thin rectangular shape is inserted into the damper groove, the plate spring 20 is installed on the damper. The damper is in contact with the leaf spring and the surface, thereby acting as a damper together with the leaf spring. At this time, the thickness of the damper and the depth of the step are adjusted according to the shape of the movable portion and the vibration characteristics of the leaf spring, so that the leaf spring and the damper have a damping effect suitable for the movement of the movable portion. The damping action of the leaf spring and damper prevents the performance degradation of the actuator due to the rotation of the movable part and the negative resonance.

According to another embodiment of the present invention, a U-V damper 41 is installed in place of the viscous damper. The yuv damper is thinly formed in a rectangular shape, is inserted into the step of the holder, and a leaf spring is installed thereon. The UV damper is in contact with the leaf spring and the surface, and serves as a damper together with the leaf spring.

Subsequently, referring to FIG. 7, an actuator cover according to a preferred embodiment of the present invention will be described. In the actuator cover 70, a lens hole 71 is formed to pass a laser beam through an objective lens on an upper surface thereof, At the end, an insertion protrusion 72 is formed to engage the actuator fixing plate. In particular, both side surfaces of the actuator form protrusions 73 protruding inward, respectively, as shown in FIG. 8 to press and fix the dampers 40 and 41 and the leaf springs 20. Dampers and leaf springs are installed on both sides of the holder, and a cross section showing a state in which an actuator cover is covered on the holder is shown in FIGS. 8 and 9.

As shown in FIG. 8, the holes of the leaf spring 20 are inserted into the projections 31 formed at both sides of the holder 30, and the holder and the leaf spring are coupled to each other, and the damper groove formed at the side of the projection is shown in FIG. 9. As shown, dampers 40 and 41 are inserted, and the leaf springs 20 are installed in contact with the dampers. At this time, the protrusion 73 of the actuator cover presses the leaf spring 20 and the dampers 40 and 41 below, thereby fixing the leaf spring and the damper.

As described above, the actuator of the optical recording-reproducing apparatus equipped with the thin viscous material damper or UV damper according to the embodiment of the present invention has the ability to accurately and quickly follow the position by preventing rotation or negative resonance of the movable part. The thickness of the damper can be adjusted according to the shape and motion characteristics of the movable part, thereby increasing the design width of the actuator.

Claims (4)

An objective lens that reads the information stored on the disk by precisely confining a laser beam to the disk, a bobbin for supporting and fixing the objective lens, a focus coil wound on an outer surface of the bobbin, and wound around front and rear surfaces of the bobbin. A plate between the track coil, a magnet for applying current to the focus coil and the track coil, a yoke for concentrating the electromotive force generated in the magnet in one direction, a holder provided outside the yoke, and both the holder and the bobbin In the actuator of the optical recording-reproducing apparatus fixed to the spring, Actuator of the optical recording-reproducing apparatus, characterized in that the holder is formed with a stepped damper groove on both sides fixing the leaf spring, and the damper is provided in the damper groove. The method of claim 1, And the damper is installed with a viscous material. The method of claim 1, The damper is an actuator of the optical recording-reproducing apparatus, characterized in that it is installed as a U-V damper. An objective lens that reads the information stored on the disk by precisely confining a laser beam to the disk, a bobbin for supporting and fixing the objective lens, a focus coil wound on an outer surface of the bobbin, and wound around front and rear surfaces of the bobbin. A holder for forming a track coil, a magnet for applying current to the focus coil and the track coil, a yoke for concentrating electromotive force generated in the magnet in one direction, and a damper groove provided at both sides of the yoke and having stepped damper grooves on both sides thereof. In the actuator of the optical recording-reproducing apparatus comprising a leaf spring fixedly installed between the holder and the bobbin, and a damper provided in the damper groove of the holder, Actuator cover for protecting the actuator is an actuator of the optical recording-reproducing apparatus, characterized in that the both sides protruding inwardly projecting, the projection is fixed by pressing the leaf spring and the damper.