KR20000038455A - Apparatus for controlling setting position of optical detector for optical pick-up - Google Patents

Abstract

PURPOSE: An apparatus is provided to control the setting position of an optical detector toward X,Y,Z, rotation and screw directions. CONSTITUTION: A rotary unit(43) rotates an optical detector(7) in one direction to a board(10). A screw control unit includes a rotary stage(45), a screw stage(47), plural screws(49) and a spring. The screw stage is mounted on the rotary stage and has X, Y and Z stages(55,57,53) on the upper portion. The screw is connected between the rotary and screw stages to control the incline of the screw stage to the rotary stage. The spring is inserted into the outer circumference of the screw and mounted between the rotary and screw stages. The screw stage is separated from the rotary stage and the screw is combined to a hole(45a) on the rotary stage. Therefore, the screw of the optical detector is controlled by tightening/releasing the screw.

Description

Setting position adjusting device of optical detector for optical pickup

The present invention relates to an apparatus for adjusting a setting position of a photodetector for an optical pickup, and more particularly, to setting a photodetector for an optical pickup such that the setting position of the photodetector can be adjusted through X, Y, Z, and rotation and skew adjustment. It relates to a position adjusting device.

A general optical pickup device is mounted on a driving device and transferred in the radial direction of the optical recording medium D to perform recording / reproducing of information on the optical recording medium D. FIG. Referring to FIG. 1, a general optical pickup apparatus includes a light source 1, a hologram element 3 disposed on an optical path between the light source 1 and the optical recording medium D, and converting a traveling path of incident light; An objective lens 5 for concentrating incident light to form an optical spot on the optical recording medium D, and an optical signal which is installed around the light source 1 and receives light reflected from the optical recording medium D to receive an information signal, And a photodetector 7 for detecting the focus error signal and the track error signal.

The hologram element 3 converts the traveling direction of light by performing a straight transmission or diffraction transmission in accordance with the incident direction of the incident light. That is, the light incident from the light source 1 is transmitted straight to the optical recording medium (D), and the light incident from the optical recording medium (D) is diffracted and transmitted toward the photodetector (7). do. The photodetectors 7 each have a plurality of split detection plates A, B, C and D which are each independently photoelectric converted. The divided detection plates A, B, C, and D are arranged next to each other in a 2x2 arrangement as shown, for example, and the differential and / or differential of the electrical signals detected in each of the divided detection plates A, B, C, and D. The sum signal amplification detects an information signal and an error signal. Therefore, the boundary lines L and L 'between each divided detection plate should have a correct alignment direction. Further, the entire photodetector 7 must be correctly placed at the position of the incident light diffracted and transmitted from the hologram element 3.

In view of such a point, it is necessary to precisely adjust the setting position of the photodetector 7 with respect to one substrate.

In view of the foregoing, the conventional apparatus for setting a position of a photodetector for optical pickup, as shown in FIG. 2, has a base 21 for setting the photodetector 7 on a fixed substrate 10. And a support block 23, X-, Y-, and Z-stages 27, 29 and 25, a movable plate 31, and a clamper 33.

The support block 23 is installed on the base 21, and a part of a driving device such as a linear motor is installed in the Z direction. The Z-stage 25 is installed to be driven in the ± Z direction with respect to the support block 23, and the X-stage 27 is installed to be driven in the ± X direction with respect to the Z-stage 25. , Y-stage 29 is installed to be capable of driving in the ± Y direction with respect to X-stage 27. The movable plate 31 is fixedly installed at one side of the Y-stage 29, and moves to the base 21 according to the driving of the X-, Y-, and Z-stages 27, 29, 25. Move in the X, Y, and Z directions. The clamper 33 is installed on the movable plate 31 and clamps the photodetector 7. The clampers 33 are arranged to be spaced apart from each other by a predetermined distance, and a pair of movable plates 34 coupled to the hinges 34a and the other movable plates clamped by the photodetector 7 around the hinges 34a ( 34 is composed of an elastic spring 35 interposed between. Accordingly, the photodetector 7 can be clamped or released by pressing / releasing the end portion of the elastic spring 35 toward the movable plate 34. Therefore, after applying the adhesive to the substrate 10 or the photodetector 7, the X-, Y-, and Z-stages 27 and 29 are clamped while the photodetector 7 is clamped using the clamper 33. (25) is driven to adjust the movable plate 31 in the X, Y, and Z directions to fix the photodetector 7 at the photodetector setting position of the substrate 10, and release the clamping to complete the installation. .

As described above, since the conventional setting position adjusting device for optical pickup is not provided with an adjustment structure for adjusting the tilt and shift of the photodetector 7, the photodetector may be generated when the optical axis of the optical pickup is aligned. There is a disadvantage that the tilt of (7) and the shift adjustment time are large and are not precisely adjusted.

Accordingly, the present invention has been made in view of the above-described disadvantages, and the setting position of the optical detector for the optical pickup that can adjust the setting position in the X, Y, Z direction and the setting position in the rotation, skew direction. The purpose is to provide an adjusting device.

1 is a schematic perspective view showing an optical arrangement of an optical pickup apparatus employing a hologram element.

Figure 2 is a schematic perspective view showing a setting position adjusting device of a conventional photodetector for an optical pickup.

Figure 3 is a schematic perspective view showing a setting position adjusting device of the optical detector for an optical pickup according to an embodiment of the present invention.

4 is a cross-sectional view of the main portion taken from FIG.

<Description of the code | symbol about the principal part of drawing>

7 ... photodetector 10 ... substrate 41 ... base

43 Rotation unit 45 Rotation stage 47 Skew stage

49 ... Skew adjustment screw 51 ... Elastic member 53 ... Z-stage

55 ... X-Stage 57 ... Y-Stage 59 ... Moving Plate

60 ... clamper

In order to achieve the above object, the present invention adjusts the setting position in the X, Y, Z direction, rotation and skew direction of a photodetector that receives incident light with respect to a substrate and detects an information signal and / or an error signal. A photodetector setting position adjusting device for an optical pickup, comprising: a base; A rotation unit rotatably installed on the base to rotate the photodetector in one direction with respect to the substrate; Skew adjusting means for rotating and adjusting said photodetector with respect to said substrate in a direction different from the direction of rotation by said rotation unit; X-, Y-, and Z-stages for driving the photodetectors in X, Y, and Z directions with respect to the substrate; A clamper mounted on one of the X-, Y-, and Z-stages so as to be movable in a rotational direction, a skew direction, and the X, Y, and Z directions with respect to the base, and clamping the photodetector; It is characterized by including.

Hereinafter, an apparatus for adjusting a setting position of a photodetector for an optical pickup according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, the apparatus for adjusting the setting position of the photodetector for the optical pickup according to the exemplary embodiment of the present invention may set the photodetector 7 with respect to the substrate 10 of the optical pickup fixedly mounted thereon. And a rotation unit 43 for rotating the photodetector 7 in one direction with respect to the substrate 10 and a rotation direction of the photodetector 7 with respect to the substrate 10 from the rotation unit 43. And skew adjusting means for rotating in the direction, X-, Y-, and Z-stages 55, 57, 53, and a clamper 60 for clamping the movable photodetector 7.

The rotation unit 43 is composed of a stator fixed on the base 41 and a rotor provided rotatably with respect to the stator, so that the photodetector 7 is oriented in one direction with respect to the substrate 10 (FIG. 3). Is rotated in the XY direction on the same radius from the origin with the Z-direction height being constant.

The skew adjusting means adjusts the inclination of the photodetector 7 with respect to the substrate 10. Referring to FIG. 3 and FIG. The skew stage 47, the some skew adjustment screw 49, and the elastic member 51 are included. The skew stage 47 is installed on the rotation stage 45 at a predetermined interval, and the X-, Y-, and Z-stages 55, 57, 53 are mounted thereon. The skew adjustment screw 49 is engaged between the rotation stage 45 and the skew stage 47 to adjust the inclination of the skew stage 47 with respect to the rotation stage 45. The elastic member 51 is fitted to the outer circumference of the skew adjusting screw 49 and is interposed between the rotary stage 45 and the skew stage 47. Accordingly, the skew stage 47 is elastically supported so that the skew stage 47 is spaced apart from the rotation stage 45 by a predetermined interval.

The skew adjusting screw 49 passes through the through hole 47a formed in the skew stage 47 and is screwed into the screw hole 45a formed in the rotating stage 45. Therefore, the skew of the photodetector 7 can be adjusted by tightening / releasing the skew adjusting screw 49.

The Z-stage 53 is installed to be driven in the ± Z direction relative to the skew stage 47, and the X-stage 55 is installed to be driven in the ± X direction relative to the Z-stage 53. , Y-stage 57 is installed to be capable of driving in the ± Y direction with respect to X-stage 55. Here, the Z-stage 53 for the skew stage 47, the X-stage 55 for the Z-stage 53, and the Y-stage 57 for the X-stage 55 are guide rails or the like. It is supported and installed to be capable of linear reciprocating transfer, and is linearly reciprocated by a driving device such as a linear motor.

The movable plate 59 is fixedly installed at one side of the Y-stage 57, the rotation unit 43, skew adjusting means, X-, Y-, Z-stages 55, 57, 53 In accordance with the driving of the rotation, skew, shift in the X, Y, Z direction relative to the base 41. The clamper 60 is installed on the movable plate 59 and clamps the photodetector 7. The clampers 60 are arranged to be spaced apart from each other by a predetermined distance, and a pair of movable plates 61 coupled to the hinge 61a and the other movable plates clamped by the photodetector 7 around the hinge 61a. 61 is composed of an elastic spring 63 interposed between. Therefore, the photodetector 7 can be clamped or released by pressing / releasing the end portion of the elastic spring 63 toward the movable plate 61. Therefore, after the adhesive is applied to the substrate 10 or the photodetector 7, the movable plate 59 is rotated, skewed, X, Y, and Z while the photodetector 7 is clamped using the clamper 60. The photodetector 7 is fixed to the substrate 10 by adjusting in the direction, and the installation is completed by releasing the above clamping.

Here, the rotation unit 43 with respect to the base 41, the skew adjusting means, the X-, Y-, Z-stages 55, 57, 53 rotate the photodetector 7 in the installation procedure thereof. It is also possible to change the configuration differently from FIG. 3 and the above-described configuration within the range that can be adjusted in the skew, X, Y, and Z directions.

As described above, the setting position adjusting apparatus of the optical pickup for optical pickup according to the present invention is configured to include a rotation unit and skew adjusting means further provided with rotation and skew in addition to the adjustment of the photodetector with respect to the substrate in the X, Y and Z directions. By adjusting with, the setting position adjustment time can be greatly reduced. In addition, by more precisely adjusting the tilt and shift of the photodetector, the DC offset of the information signal and the error signal according to the setting error of the photodetector can be reduced.

Claims (2)

A photodetector setting position adjusting device for adjusting the setting position in the X, Y, Z direction, rotation, and skew direction of a photodetector that receives incident light to a substrate and detects an information signal and / or an error signal. To A base; A rotation unit rotatably installed on the base to rotate the photodetector in one direction with respect to the substrate; Skew adjusting means for rotating and adjusting said photodetector with respect to said substrate in a direction different from the direction of rotation by said rotation unit; X-, Y-, and Z-stages for driving the photodetectors in X, Y, and Z directions with respect to the substrate; A clamper mounted on one of the X-, Y-, and Z-stages so as to be movable in a rotational direction, a skew direction, and the X, Y, and Z directions with respect to the base, and clamping the photodetector; Setting position adjusting device of the optical detector for optical pickup comprising a. The method of claim 1, wherein the skew adjusting means, A rotation stage provided on the rotation unit; A skew stage provided on the rotation stage with a predetermined interval spaced thereon and the X-, Y-, and Z-stages mounted thereon; A plurality of skew adjusting screws fastened between the rotating stage and the skew stage to adjust an inclination of the skew stage with respect to the rotating stage; And an elastic member interposed between the rotation stage and the skew stage to elastically support the skew stage.