KR100455399B1 - A positioning apparatus for lens of optical pickup - Google Patents

Abstract

The lens position adjusting device of the disclosed optical pickup includes a lens holder on which a lens is mounted, a base having a seating surface on which the lens holder is slidably seated, and an elastic pressing member for pressing the lens holder toward the seating surface to elastically fix the position. It includes, the seating surface of the base and the contact surface of the lens holder in contact with it is made of inclined surface in close contact with each other. In such a configuration, since the lens holder is slidably seated on the inclined mounting surface, the lens holder is prevented from being skewed in a direction other than the sliding direction, thereby enabling a more stable lens position adjustment operation.

Description

A positioning apparatus for lens pickup of optical pickup

The present invention relates to a lens position adjusting device for adjusting the position of the lens embedded in the optical pickup.

In general, the optical pickup is provided with an optical system as shown in FIG. As shown, the optical system of the optical pickup includes a light source 3 for emitting light having a predetermined wavelength, a grating 4 for dividing the light incident from the light source 3 into 0th order and ± 1th order, and the light source 3 Plate-type beam splitter 5 for changing the path of the light emitted from the light source), collimating lens 6 for focusing the incident light for converting the divergent light incident from the light source 3 into parallel light, and an optical disk. An objective lens 7 for condensing into an optical spot on the recording surface of (1), and light reflected from the recording surface of the optical disc 1 and sequentially passing through the objective lens 7 and the plate-shaped beam splitter 5 A photodetector 9 for receiving an information signal and an error signal, and positioned between the plate-shaped beam splitter 5 and the photodetector 9 to enlarge the size of the light spot received by the photodetector 9. And a concave lens 8.

The concave lens 8 is also referred to as a yo lens, and its position is usually adjusted and fixed by a position adjusting device as shown in FIG. The illustrated lens position adjusting device includes a lens holder 30 on which the concave lens 8 is mounted, a base 10 on which the lens holder 30 is supported, and a lens holder 30 coupled to the base 10. ) Is provided with a spring member 20 for elastically close contact with the base 10. Therefore, the position of the lens holder 30 is fixed to the seating surface 11 side of the base 10 by the pressing piece 21 of the spring member 20 is fixed. In this state, when the position of the concave lens 8 is to be adjusted, the adjustment rod 40 illustrated in FIG. 2 is inserted into the adjustment groove 31 of the lens holder 30, and the light is focused while displacing in the direction of arrow A. FIG. . And when the adjustment rod 40 is taken out after focusing, since the said pressing piece 21 keeps pressing, the position is maintained.

However, there is a slight gap g due to the tolerance between the side wall 12 of the base 10 adjacent to the seating surface 11 and the end of the lens holder 30 as shown in the figure. Therefore, when adjusting the position of the concave lens 8 as described above, the phenomenon that the lens holder 30 moves in the arrow B direction or returns to the arrow R direction within the gap g may occur. In this case, it becomes difficult to accurately move the lens holder 30 to the intended position, and since it becomes an unstable posture even after the movement, there is a problem that it is impossible to form a precise optical path.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an improved lens position adjusting device for optical pickup, which can perform lens position adjustment more stably.

1 is a view schematically showing an optical system of a general optical pickup disposed along an optical path;

2 is a view showing a conventional lens position adjusting device,

3 is a view showing a lens position adjusting device according to the present invention.

<Description of the symbols for the main parts of the drawings>

100 ... base 110 ... mounting surface

120 ... side wall 200 ... elastic pressure member

300 Lens holder 301 Contact surface

310 ... Adjusting groove 400 ... Adjusting rod

8 ... yo lens

The present invention for achieving the above object, a lens holder on which the lens is mounted, a base having a seating surface on which the lens holder is slidably seated, and pressing the lens holder toward the seating surface to elastically fix the position In the optical pickup lens position adjusting device including an elastic pressure member, the seating surface and the contact surface of the lens holder in contact with the mounting surface is characterized in that the inclined surface in close contact with each other.

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

3 shows an apparatus for adjusting lens position of an optical pickup according to the present invention.

The illustrated lens positioning device includes, for example, a base 100 having a lens holder 300 on which a lens 8 such as a concave lens is mounted, a seating surface 110 on which the lens holder 300 is mounted, and the The lens holder 300 includes an elastic pressing member 200 for tightly fixing the position by closely contacting the base 100.

Here, the seating surface 110 is not a horizontal plane perpendicular to the side wall 120 of the base 100 as in the prior art, but consists of an inclined surface that is inclined downward from the side wall 120. In addition, the contact surface 301 of the lens holder 300 in contact with the seating surface 110 is configured to be in close contact with each other by being made of an inclined surface of such a slope.

As such, when the seating surface 110 and the contact surface 301 are in close contact with the inclined state, when the adjustment rod 400 is inserted into the adjustment groove 310 to move the lens holder 300, an adjustment groove is applied to the force ( The distance between the mounting surface 110 supporting the lens holder 300 and 310 is closer than that of the related art, and the rotation moment is reduced. And even if there is a gap between the side wall 120 and the lens holder 300, since the contact surface 301 of the lens holder 300 is in close contact with the inclined seating surface 110 on both the left and right sides, the arrow B direction or the R direction. The possibility of flowing into

In the above configuration, when adjusting the position of the lens 8, the adjustment rod 400 is inserted into the adjustment groove 310 as described above, and then the lens holder 300 is slid along the seating surface 110 in the arrow A direction. The position will be adjusted. At this time, the lens holder 300 slides while the contact surface 301 is sandwiched between the left and right seating surface 110 inclined at such an inclination, and thus the lens holder 300 in another direction such as the B direction or the R direction of the drawing. There is little chance that it will go wrong. Therefore, the lens 8 can be accurately moved to a desired position, thereby enabling more stable lens position adjustment.

As described above, the lens position adjusting device of the optical pickup according to the present invention provides the following advantages.

First, the lens holder is slidably seated on an inclined seating surface, thereby preventing the lens holder from being distorted in a direction other than the sliding direction, thereby enabling a more stable lens position adjustment operation.

Secondly, the effect of tolerances such as the gap between the base sidewall and the lens holder end is eliminated much, so there is a margin in the design.

Third, when the lens holder is seated on the seating surface, the lens holder is naturally seated as the lens holder slides between the inclined left and right seating surfaces, so that it is very easy to set the initial position of assembly.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (1)

An optical pickup lens including a lens holder on which a lens is mounted, a base having a seating surface on which the lens holder is slidably seated, and an elastic pressing member for pressing the lens holder toward the seating surface to elastically fix the position. In the position adjusting device, And a contact surface of the seating surface and the lens holder in contact with the seating surface is an inclined surface in close contact with each other.