JPH11134704A - Optical part adjusting/fitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fitting precision with simple constitution by temporarily fitting an optical part to a fitting surface movably in the adjustment direction of this part, pressing an adjusting tool on the temporarily fitted optical part through an elastic member provided on the tool side, moving/adjusting this optical part and really fitting it. SOLUTION: A screw 104 of a lens frame 200 is loosened, and a lock on a base 100 is released, and an adjusting device 300 is pressed on the lens frame 200 so that its eccentric pin 312 is engaged with a peripheral direction groove 204. The lens frame 200 is pressed to the abutment surface 102 of the base 100 by prescribed pressing force of a coil spring 324 in the pressing members 320 of the adjusting device 300 to regulate the movement other than an optical axial direction by the abutment surface 322. In such a state, when an operation shaft 310 is turned, the lens frame 200 moves in the optical axial direction by engagement between the eccentric pin 312 and the peripheral direction groove 204, and after position adjustment is finished, the screw 104 is turned to be fixed. Thus, the miniaturized and stable optical adjustment is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting and mounting an optical component.

[0002]

Recently, the areal recording density is 1
Magneto-optical disk devices exceeding 0 Gbit / (inch) ² are being developed. In this apparatus, the angle of incidence of a laser beam on an objective optical system provided at the end of a coarse movement arm that rotates, for example, in a direction intersecting the track of the magneto-optical disk is finely adjusted by a deflecting means such as a galvanometer mirror. It is considered that tracking is accurately performed at a narrow track pitch level of, for example, 0.34 μm. By the way, in such a device, it is necessary to accurately mount optical components such as a lens in a thin coarse movement arm and to make the completed arm itself very structurally simple. An adjustment mounting method that meets this requirement is desired. Was rare.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned background, and the invention of claim 1 has an optical component mounted on a mounting surface so as to be movable in an adjusting direction of the component. The optical component is temporarily fixed, and the adjustment tool is pressed against the temporarily fixed optical component via an elastic member provided on the tool side to adjust the movement of the optical component, and after the adjustment, the optical component is permanently fixed. And

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, near-field recording (NFR: near) has been proposed in response to a demand for an external storage device accompanying the recent advances in hardware and software related to a computer, particularly a demand for a large storage capacity. field recor
An outline of a magneto-optical disk recording / reproducing apparatus using a recording / reproducing method called a technique will be described with reference to FIGS.

FIG. 1 is an overall schematic diagram of the optical disk device. An optical disk 2 is mounted on a rotating shaft of a spindle motor (not shown) in the disk drive device 1. On the other hand, a rotating (coarse movement) arm 3 for reproducing or recording information on the optical disk 2 is mounted so as to be parallel to the recording surface of the optical disk 2. This rotating arm 3
Is rotatable about a rotation shaft 5 by a voice coil motor 4. A floating optical head 6 having an optical element mounted thereon is mounted on a tip of the rotating arm 3 facing the optical disk 2. In addition, the rotating arm 3
A light source module 7 having a light source unit and a light receiving unit is disposed in the vicinity of the rotation shaft 5 and is configured to be driven integrally with the rotating arm 3.

FIGS. 2 and 3 illustrate the distal end portion of the rotating arm 3, and particularly illustrate the floating optical head 6 in detail. The floating optical unit 6 is attached to the flexure beam 8 and is arranged to face the optical disc 2. The flexure beam 8 is fixed to the rotating arm 3 at the other end, and presses the floating optical unit 6 at the distal end portion in a direction in which the floating optical unit 6 comes into contact with the optical disc 2 by the elastic force of the flexure beam 8.

The floating optical unit 6 includes a floating slider 9, an objective lens 10, and a solid immersion lens (S
IL) 11 and a magnetic coil 12, and functions to converge a parallel laser beam 13 emitted from the light source module 7 onto the optical disc 2. A rising mirror 31 is fixed to the tip of the rotating arm 3 to guide the laser beam 13 to the floating optical unit 6. Objective lens 1 by rising mirror 31
The laser light flux 13 incident on 0 is converged by the refraction of the objective lens 10. A solid immersion lens (SIL) 11 is disposed near the light-collecting point.
The convergent light is applied to the optical disc 2 as finer evanescent light 15.

A magnetic coil 12 for recording in a magneto-optical recording system is formed around a solid immersion lens (SIL) 11 facing the optical disk 2. It can be applied on the surface. This evanescent light 1
5 and the magnetic coil 12 enable high-density recording and reproduction on the optical disk 2. The floating optical unit 6 floats by a very small amount due to the airflow generated by the rotation of the optical disk 2 and follows the surface runout of the optical disk 2. For this reason, focus control (focus servo) of the objective lens, which is required in the conventional optical disk device, is not required.

The light source module 7 mounted on the rotating arm 3 and the light beam guided to the floating optical unit 6 will be described in detail below with reference to FIGS. The rotating arm 3 has a floating type optical unit 6 mounted at the tip and a driving coil 1 for driving a voice coil motor 4 at the other end.
6 is fixed. The drive coil 16 is a flat coil, and is inserted and arranged in a magnetic circuit (not shown) with a gap. The rotating shaft 5 and the rotating arm 3 are provided with a bearing 17,
When the current is applied to the drive coil, the rotation arm 3 can be rotated about the rotation shaft 5 by the electromagnetic action with the magnetic circuit.

The light source module 7 mounted on the rotating arm 3 has a semiconductor laser 18, a laser drive circuit 19,
Collimating lens 20, composite prism assay 21, laser power monitor sensor 22, reflection prism 2
3, a data detection sensor 24 and a tracking detection sensor 25 are arranged. The laser beam in a divergent beam state emitted from the semiconductor laser 18 is converted into a parallel beam by the collimating lens 20. The cross-sectional shape of the parallel light beam is an elliptical shape due to the characteristics of the semiconductor laser 18, and it is inconvenient to narrow the light beam onto the optical disk 2 minutely. Therefore, the cross-sectional shape of the parallel light beam is shaped by making the parallel light beam having an elliptical cross section emitted from the collimating lens 20 enter the composite prism assay 21.

The entrance surface 21a of the composite prism assay 21
Has a predetermined slope with respect to the incident optical axis. By refracting the incident light, the cross-sectional shape of the parallel light beam can be shaped from an oval shape to a substantially circular shape. The shaped laser beam travels through the complex prism assay 21 and enters the first half mirror surface 21b. The first half mirror surface 21b transmits information obtained from the optical disk 2 to the data detection sensor 24 and the tracking detection sensor 25.
However, on the outward path, it serves to separate the light beam to the laser power monitor sensor 22 for detecting the output power of the laser emitted from the semiconductor laser 18.

Since the laser power monitor sensor 22 outputs a current proportional to the intensity of the received light, the output of the semiconductor laser 18 can be stabilized by feeding back this output to a laser power control circuit (not shown). . The laser beam 13 having a substantially circular cross-sectional shape and emitted from the composite prism assay 21 is applied to the deflecting mirror 26, and the traveling direction of the laser beam 13 is changed. The deflecting mirror 26 is attached to a galvano motor 27 having a rotation center about an axis perpendicular to the plane of the paper, and can deflect the laser beam 13 by a small angle in a direction parallel to the plane of the paper.

The galvano motor 27 is provided with a deflection mirror position detection sensor 28 for detecting the rotation angle of the deflection mirror 26. The laser beam 13 reflected by the deflecting mirror 26 is transmitted to the first relay lens 29 and the second relay lens 29.
After passing through a relay lens (imaging lens) 30, the light is reflected by a rising mirror 31 and reaches the floating optical unit 6. The first relay lens 29 and the second relay lens 30 make the relationship between the reflection surface of the deflecting mirror 26 and the pupil surface (principal plane) of the objective lens 10 arranged in the floating optical unit 6 into a conjugate relationship. That is, a relay lens optical system is formed. That is, when the condensed beam on the optical disk 2 is slightly deviated from a predetermined track, the deflecting mirror 26 is slightly rotated to tilt the laser beam 13 incident on the objective lens 10 to move the focal point on the optical disk 2. Correction. However, when performing focus correction with this method,
If the optical distance between the deflecting mirror 26 and the objective lens 10 is long, the amount of movement of the laser beam 13 incident on the objective lens 10 increases, and it may not be possible to enter the objective lens 10.

In order to avoid such a phenomenon, the first relay lens 29 and the second relay lens 30
The relationship between the reflection surface of the deflecting mirror 26 and the pupil surface of the objective lens 10 is set to be a conjugate relationship, and even if the deflecting mirror 26 rotates, the laser beam 13 incident on the objective lens 10 does not move, Tracking control is made possible. The access operation over the inner circumference / outer circumference of the optical disk 2 is performed by rotating the rotating arm 3 by the voice coil motor 4, and only minute tracking control is performed by rotating the deflection mirror 26.

The return laser beam 13 reflected from the optical disk 2 and returning returns to the deflecting mirror 2 in a direction opposite to the forward path.
The reflected light is incident on the composite prism assay 21.
Thereafter, the light is reflected by the first half mirror surface 21b and travels to the second half mirror surface 21c. The second half mirror surface 21c generates transmitted light directed to the tracking detection sensor 25 and reflected light directed to the data detection sensor 24, and separates the laser beam on the return path. The laser beam transmitted through the second half mirror surface 21c is applied to the tracking detection sensor 25, and outputs a tracking error signal.

On the other hand, the laser beam reflected by the second half mirror surface 21c is polarized and separated by the Wollaston prism 32, converted into convergent light by the condensing lens 33, and then reflected by the reflecting prism 23 to be detected by the data detection sensor. 24. The data detection sensor 24 has two light receiving areas, and receives two polarized beams polarized and separated by the Wollaston prism 32 to read data information recorded on the optical disk 2 and output a data signal. To be precise, the tracking error signal and the data signal are generated by a head amplifier circuit (not shown) and sent to a control circuit or an information processing circuit.

Next, adjustment of the lens frame of the collimator lens 20 will be described. FIGS. 6 (a) and 6 (b)
It is the front view and side view which show the lens frame 200 which holds the collimating lens 20, and the adjustment apparatus 300 which adjusts the position of the lens frame 200. The collimating lens 20 is bonded and fixed inside a substantially cylindrical lens frame 200. The lens frame 200 holding the collimating lens 20 is attached to a base 100 provided on the rotating arm 3 (FIG. 4). The base 100 has a pentagonal cross section with a substantially V-shaped lower part, and the lens frame 200 is applied to two V-shaped inclined surfaces (contact surfaces 102). Lens frame 200
A screw hole 202 is formed in the bottom of
Screw 104 (through washer 106)
By screwing into the screw hole 202, the lens frame 200
Is fixed. At this time, the lens frame 200 is urged against the contact surface 102 by a firm pulling load.

As shown in FIG. 6, the adjusting device 300 includes an operating shaft 310 having an eccentric pin 312 at the tip,
10. A pair of pressing members 320 arranged in parallel on both sides of
And a holding member 330 for holding the operation shaft 310 and the pressing member 320. By the holding member 330, the operation shaft 310 is rotatably held, and the pressing member 320 is held so as to be able to move up and down. The pressing member 320 is urged downward by a coil spring 324, and has an inverted V-shaped contact surface 322 at the lower end.

FIG. 7 is a front view and a side view showing a process of adjusting the position of the lens frame 200. When adjusting the position of the lens frame 200, the screw 104 is loosened to loosen the base 100.
Of the lens frame 200 is released. A circumferential groove 204 that engages with the eccentric pin 312 is formed in the upper part of the outer peripheral surface of the lens frame 200. The adjusting device 300
The eccentric pin 312 is engaged with the circumferential groove 204,
It is pressed against the lens frame 200 from above.

The lens frame 200 is urged against the contact surface 102 of the base 100 with a predetermined pressing force by a pressing member 320 of the adjusting device 300. The pressing force of the pressing member 320 is provided by the coil spring 324, and can be adjusted as appropriate. Further, since the cylindrical outer peripheral surface of the lens frame 200 is sandwiched from above and below by the inverted V-shaped contact surface 322 and the V-shaped contact surface 102, the movement of the lens frame 200 in directions other than the optical axis direction is restricted. You. In this state, the operation shaft 31
When 0 is rotated as shown by R in the figure, the lens frame 200 can be moved in the optical axis direction (shown by T in the figure) by engagement of the eccentric pin 312 and the circumferential groove 204 of the lens frame 200. it can. After the position adjustment of the lens frame 200 in the optical axis direction is completed, the screw 104 is tightened to fix the lens frame 200.

As described above, according to the present embodiment, it is not necessary to provide a member for biasing the lens frame 200 on the base 100, so that there is no need to provide an extra space on the base 100 side, and the size of the entire product can be reduced. Easy to do. Further, if the pressing force of the pressing member 310 of the adjusting device 300 can be adjusted, more stable optical adjustment can be performed.

FIGS. 8A and 8B are a front view and a side view showing an adjusting device 400 according to the second embodiment. Second
The adjusting device 400 of this embodiment uses a bent leaf spring 420 instead of the pressing member 320 of the adjusting device 300 of the first embodiment. The leaf spring 420 has an upper end fixed to the holding member 330 and a lower end bent into an inverted V-shape to form a contact surface 422. Other configurations are
This is the same as in the first embodiment. With such a configuration, as in the first embodiment, it is not necessary to provide a member for urging the lens frame 200 on the base 100, and it is easy to reduce the size of the entire product.

[0023]

As described above, according to the optical component adjusting and mounting method of the present invention, the optical component in the coarse movement arm can be adjusted and mounted with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of a magneto-optical disk device according to an embodiment.

FIG. 2 is a diagram showing a distal end portion of a rotating arm of the magneto-optical disk device of FIG. 1;

FIG. 3 is a sectional view showing a floating optical unit.

FIG. 4 is a plan view showing a configuration of a rotating arm.

FIG. 5 is a side view of the rotating arm of FIG. 4;

FIG. 6 is a front view and a side view showing the adjusting device.

FIG. 7 is a diagram showing an adjustment process by the adjustment device of FIG. 6;

FIG. 8 is a front view and a side view showing an adjustment device according to a second embodiment.

[Explanation of symbols]

 Reference Signs List 20 collimating lens 100 base 102 abutment surface 200 lens frame 202 circumferential groove 300 adjusting device 310 operating shaft 312 eccentric pin 320 pressing member 330 holding member 420 leaf spring

Claims (1)

[Claims] 1. An optical component is temporarily fixed to a mounting surface so as to be movable in an adjusting direction of the component, and an adjusting tool is pressed against the temporarily fixed optical component via an elastic member provided on the tool side. A method for adjusting and mounting an optical component, comprising: adjusting the movement of an optical component; and, after the adjustment, permanently fixing the optical component.