JPH0415531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tracking mirror actuator used in an optical information recording/reproducing device, and particularly to an adjustment mechanism suitable for positioning a tracking mirror.

[Background of the Invention] Information recording devices such as optical disk devices that write or read information on a recording medium using a light spot require a mirror actuator to make the light spot follow the information track accurately. do. However, since the conventional mirror actuator for the track servo only has an adjustment mechanism in one axis direction, it is difficult to accurately attach and adjust the mirror during assembly.

[Purpose of the invention]

An object of the present invention is to easily initialize the mirror of a mirror actuator for track servo in an optical head of an optical information recording/reproducing apparatus to an optically ideal position.

[Summary of the invention]

A mirror actuator for track servo of an optical head of an optical information recording/reproducing device requires precise track servo. Therefore, even in the initial setting, the amount of angular deviation with respect to the optical axis and positional deviation with respect to the objective lens is allowed to be minute. Due to mechanical precision, it is difficult to suppress these deviations within a range, and this is also disadvantageous in terms of cost. Therefore, by providing an adjustment mechanism, the present invention has made it possible to suppress the following deviation amount within the range.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 2, light enters in direction A, is reflected by mirror 1, travels in direction B, and enters objective lens 10. The mirror 1 is adhesively fixed on a mirror stand 4, and the driving coil 2 is adhesively fixed on the mirror stand 4. The elastic support body 5 connects the mirror stand 4 and the shaft 6. The block 8 presses the shaft 6 against the body 7 with a screw, and the body 7 has a cylindrical clearance fit at the contact portion with the adapter 9, and is fastened with the screw as shown in FIG. By applying a current to the driving coil 2 existing in the magnetic field created by the driving magnet 3, the mirror 1 is centered around an axis Rotating motion. The initial settings for mirror 1 are that its surface forms a 45 degree angle to the optical axes O and O', that the surface is perpendicular to the plane of the paper, and that the surface of mirror 1 is devoid of all incident light spots. It is required to be in a position where it can be reflected even during rotational movement without causing any damage. For example, in FIG. 2, if the reflecting surface of mirror 1 is the MM plane, a portion of the light will not be reflected.

When the shaft 6 is loosely pressed against the V-groove of the body 7 with a screw, it is possible to adjust the rotation of D and D'. You can adjust it as you like. After the adjustment is completed, the shaft 6 is fixed to the body 7 by adhesive. The body 7 has a cylindrical clearance fit with the adapter 9, and can rotate around the axes O and O''.
Since the body 7 having the mirror 1 therein moves in directions F and F' in FIG. 1, the mirror surface can be adjusted to be perpendicular to the paper plane in FIG. 2. Also, since the block 8 is made of a hard material such as stainless steel and the body 7 is made of a relatively soft material such as aluminum, increasing the tightening force of the screw pushing the block 8 causes the shaft 6 to
deforms the V-groove of the body 7 and bites into it. As a result, all of 1 to 6 are displaced in the direction of C. If the tightening force of the screw is reduced, it will be displaced in the direction of C'. From the above, mirror 1 during tracking servo
rotates as indicated by E and E', but at this time it is possible to adjust the position so that all the spot light from A can be reflected in the direction of B without missing.

〔Effect of the invention〕

According to the present invention described above, the initial setting of the mirror of the mirror actuator for the track servo is
Since this can be achieved by making extremely simple adjustments, it becomes possible to reduce the precision required for each component that constitutes the actuator. Also, errors caused by assembly can be eliminated through adjustment. For example, the angle formed between the mirror surface and the incident light requires an accuracy of a few tenths of a degree, and if this was to be achieved with mechanical precision alone, it would be almost impossible for products that are mass-produced. Although it is possible, it is clearly disadvantageous from a cost standpoint. In contrast, according to the adjustment method of the present invention, the angle adjustment between the mirror surface and the incident light can be performed in about one minute at most by using an optical jig.

Furthermore, since the movement of the mirror surface in the direction perpendicular to it can be adjusted, it is possible to adjust the position so that all the incident light is directed to the objective lens.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of one embodiment of the present invention, and FIG. 2 is a sectional view of FIG. 1. DESCRIPTION OF SYMBOLS 1...Mirror, 2...Driving coil, 3...Driving magnet, 4...Mirror stand, 5...Elastic support, 6...Shaft, 7...Body, 8...Block, 9... Adapter, 10...Objective lens.

Claims (1)

[Claims] 1. A reflective surface that reflects incident light and directs it toward an objective lens, a support member that rotatably supports the reflective surface around a rotation axis, and a drive device that rotates the reflective surface at a desired angle. , comprising the reflective surface, the support member, and a holding member that holds the drive device, a shaft member being provided in the vicinity of the rotation shaft, and a groove portion that engages with the shaft member being provided in the holding member, The holding member is rotated around the shaft member to adjust the angle of the reflective surface with respect to the optical axis of the incident light, and the shaft member deforms the groove to move the reflective surface in a direction perpendicular to it. A tracking actuator for an optical information recording/reproducing device, characterized in that it adjusts.