JPH04278226A - How to install optical components - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting optical components, and more particularly to a method for adjusting the mounting angle of optical components such as prisms in optical information recording devices.

0002

2. Description of the Related Art Conventionally, in this type of technology, as shown in FIG. 5, a mechanism for adjusting the mounting angle of an optical component is provided in a movable part and a carriage part on which the optical component is mounted.

According to the conventional example shown in FIG. 5, the triangular prism 9 is adhesively fixed to a triangular prism fixing base 28 in advance. This triangular prism fixing base 28 is attached to the carriage part 8 by two fixing base angle adjusting screws 29 and a pivot pin 30, and rotates around the pivot pin 30. Laser light 10 emitted from optical head section 13 on main chassis 17 in FIG. Laser light 10 bent by triangular prism 9 enters an autocollimator. From then on, adjust the fixing base angle adjustment screw so that the spot of the laser beam 10 displayed on the display 12 in FIG. 29 to adjust the angle of the triangular prism 9. After the adjustment is completed, fix the fixing base angle adjustment screw 29 using a screw locking agent or the like.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned technology, since the reference surface is the outer yoke surface of the voice coil motor, errors in the mounting angle of the spindle motor caused by individual drives may cause problems when mounting the spindle motor on the hub. An angle error occurs between the surface of the magneto-optical recording medium and the outer yoke surface of the voice coil motor, which is the reference surface. There is a surface angle error between the magneto-optical recording medium and the surface of the mounted magneto-optical recording medium, and it has been difficult to irradiate the magneto-optical recording medium perpendicularly with laser light via optical components.

Furthermore, since the mounting angle adjustment mechanism for optical components is mounted on the carriage, which is a movable part, the weight of the carriage increases, and the operating acceleration of the carriage decreases, making it difficult to shorten the seek time. Met.

The present invention has been made in order to solve these drawbacks, and it is an object of the present invention to prevent a difference in the mounting angle of optical components between the time of adjustment and the time of actually mounting a recording medium, and to The aim is to shorten seek time by making the unit lighter.

[0007]

[Means for Solving the Problems] In the optical component mounting method of the present invention, in order to irradiate the laser light emitted from the optical head section attached to the main chassis perpendicularly to the surface of the recording medium, the laser optical axis is adjusted. In the installation method for the bending optical component (triangular prism), a glass plate is attached to the spindle motor hub on the drive, and the triangular prism is attached assuming that an actual magneto-optical recording medium is attached to the spindle motor hub. While observing with an autocollimator whether the laser beam bent through the glass plate is perpendicular to the surface of the glass plate, the mounting angle of the triangular prism is adjusted using a device equipped with a tilting mechanism for optical components.
The triangular prism is fixed to the carriage part only with adhesive.

[0008]

[Operation] According to the above structure of the present invention, when adjusting the mounting angle of the optical component, in the device manufactured by the present invention and equipped with the tilting mechanism for the optical component, by operating the angle adjustment screw on the device. The entire device rotates by θ around the positioning pin, and the optical components attached to the device move simultaneously to change the angle.

The optical axis of the laser beam emitted from the optical head is bent by the optical component. This laser light is received by a CCD camera within the range of the effective diameter of the lens in the autocollimator, and is displayed as a spot on the display.

The laser optical axis whose angle changes due to the angle change of the optical component is detected by an autocollimator and displayed on the display as an X-Y change in the spot position. The white diverging light emitted from the light source in the autocollimator becomes a cross-shaped parallel beam bundle through a cross slit and a lens system in the measuring device, and is irradiated onto the glass plate surface attached to the spindle hub.

[0011] The cross-shaped parallel light beam reflected by the glass plate surface enters the autocollimator again, passes through the optical system and the CCD camera, and is displayed as a cross bright line on the display.

A cross-shaped scale gauge is attached to the CCD camera, and all light incident on the optical measuring device is received by the CCD camera through this gauge.

[0013] The cross gauge in the CCD camera is positioned in advance so that when the parallel light emitted from the optical measuring device is irradiated perpendicularly to the glass plate surface, it overlaps the monitor image of the reflected light. and fixed.

[0014] When adjusting the mounting angle of the optical component, the mounting angle of the optical component is adjusted by the device produced in the present invention, and the adjustment is performed by using the parallel cross light emitted from the autocollimator and the optical component. The measurement is carried out while observing the images of each crosshair, spot, and crosshair gauge displayed on a display using a laser beam, an optical measuring device, and a CCD camera.

When fixing the optical component to the carriage section, the optical component is positioned at a fixed position on the carriage using the positioning pin on the mounting angle adjustment device, and the adhesive is applied from the adhesive injection port to the triangular prism of the carriage section. Inject it into the gap between the adhesive surface and the optical component to fix them.

Therefore, according to the present invention, the reference plane for adjusting the mounting angle of the optical component is made more similar to the actual recording medium surface, and the angle adjustment mechanism is made independent of the carriage section by the mounting angle adjusting device. Optical components can be attached to the carriage part in this state.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the overall configuration of an apparatus in an embodiment of the present invention. 1 in the figure is an autocollimator, which is a device that accurately measures the angle between the optical axis of the optical system that makes up the autocollimator and the optical axis of the incident light beam. It is something to be measured. 2
is a glass plate with a mirror surface, 3 is a spindle motor hub, which is directly connected to the spindle motor via a shaft, 4
is an inclination angle adjustment screw whose tip is in contact with rail 7,
The overall inclination angle of the frame 5 is changed by the vertical movement of this screw. 5 is the frame of the main body of the triangular prism mounting angle adjustment device, which has an adhesive injection hole 22 and a laser beam emission hole 2.
3 and a carriage part positioning pin 6 shown in FIG. 2, a support 25 for positioning the frame 5 with respect to the rail 7, and a triangular prism mounting part 26; 8 is mounted on this rail 7 via a bearing and moves in the axial direction. Reference numeral 12 denotes a display, and reference numeral 13 denotes an optical head section, which is composed of a semiconductor laser, an optical system, and a sensor system for detecting a magneto-optical signal. Laser light is emitted from this optical head section in parallel to the rail 7. A CCD camera 14 transmits information from the autocollimator 1 as an image signal to the display 12 via a cable. Reference numeral 15 denotes a light source, and the white diverging light emitted from this becomes a parallel cross beam through an optical system and a cross slit inside the autocollimator, and becomes an analysis light for measurement. 16 is a stand that supports the autocollimator 1, 17 is a main chassis, and includes an optical head section,
Equipped with a motor drive system and actuator system. 18 is the main chassis fixed stand, 19 is the rotation stage,
It gives an inclination to the main chassis fixing base 18,
By tilting the main chassis fixing base 18 and the main chassis 17 positioned thereon, the glass plate 2 attached to the spindle motor hub 3 is tilted, and the parallel cross beam 11 emitted from the autocollimator 1 is
The glass plate 2 is made perpendicular to the glass plate 2. 20 is a horizontal plate to which the rotation stage 19 is fixed with screws. Reference numeral 22 denotes an adhesive injection hole, which is used to inject adhesive between the carriage portion 8 and the prism 9 after adjusting the angle of the triangular prism 9 shown in FIG. 23 is a laser beam exit hole, and the laser beam bent by the triangular prism 9 passes through this hole and enters the autocollimator 1. 24 is a main chassis mounting pin. Place this pin in the groove on the side of the main chassis fixing base 18, and then attach the main chassis 1.
7 is attached to the main chassis fixing base 18.

FIG. 2 is a diagram showing an apparatus for adjusting the mounting angle of an optical component according to the present invention and its structure, which is a feature of the present invention. The parallel cross beam 11 emitted from the autocollimator 1 is reflected by the glass plate 2 attached to the spindle motor hub 3, and is reflected by the autocollimator 1 again.
incident on . The angle of the glass plate 2 is adjusted by the rotation stage 19 in FIG. 1 so that it is perpendicular to the parallel cross beam 11. The carriage part 8 is held by two rails 7 via bearings, and moves smoothly in the direction of the rails. The main body frame 5 of the optical component mounting angle adjustment device includes a mounting angle adjustment screw 4,
It is positioned by the carriage part positioning pin 6 and the positioning post 25, and thereby the triangular prism mounting part 26
The triangular prism 9 mounted on the carriage portion 8 is positioned at a position where it is fixed to the carriage portion 8. The laser emitted light 10 whose optical axis is fixed at the optical head section 13 is
After the optical axis is bent by the triangular prism 9, the laser beam passes through the laser beam exit hole and enters the autocollimator 1. if,
Optical axis 1 of laser light bent through this triangular prism 9
0 is not perpendicular to the glass plate 2, tilt the device 5 by moving the mounting angle adjusting screw 4 up and down, and adjust the mounting angle of the triangular prism 9 so that the optical axis 10 of the laser beam is not perpendicular to the glass plate 2. It must be adjusted vertically. Diagrams related to this adjustment are shown in FIGS. 3 and 4 below.

FIGS. 3(a), 3(b), and 3(c) each refer to the plane of rotation of the optical axis that includes the two mounting angle adjustment screws 4 that are in contact with the rail 7 in the embodiment. It is a figure which shows attachment angle adjustment. In this embodiment, a triangular prism 9 is attached to the angle adjustment device 5 which is held on the rail 7 by two angle adjustment screws 4.
A laser beam incident from the back side of the paper is bent by a triangular prism 9 and becomes a laser beam 10. After adjusting the mounting angle, attach the triangular prism fixing adhesive surface 21 on the carriage part 8.
An ultraviolet curing adhesive 32 is applied to the gap between the triangular prism 9 and the triangular prism 9, and the triangular prism 9 is fixedly bonded. For the mounting angle of the triangular prism 9 in FIG. 3(a), FIG.
FIG. 3(c) is a diagram in which the mounting angle of the triangular prism 9 is rotated by 5 degrees left and right about the carriage positioning pin 9 as the rotation center by the vertical movement of the mounting angle adjustment screw 4.

FIGS. 4(a), 4(b), and 4(c) are diagrams showing the mounting angle adjustment in which the plane parallel to the rail axis is the rotational plane of the optical axis in the embodiment, respectively. The adjustment is performed by simultaneously moving the two angle adjustment screws 4 up and down by the same amount and in the same direction. At this time, the triangular prism 9 moves with the carriage positioning pin 6 as the center of rotation and changes its angle, thereby adjusting the inclination of the optical axis of the laser beam 10 from the optical head 13 bent by the triangular prism 9. It's changing.

Therefore, according to the above embodiment, when fixing and bonding the triangular prism 9 to the carriage portion 8, first,
The angle of the glass plate 2 is finely adjusted by the rotation stage 19 so that the reference plane is perpendicular to the parallel cross beam 11, and the emission angle of the laser beam via the triangular prism 9 is determined as the mounting angle with respect to the reference plane. The angle is adjusted by vertical movement of the angle adjustment screw 4 of the adjustment device 5, and the adjusted triangular prism 9 can be fixed to the pre-positioned fixed adhesive surface 21 of the carriage part 8 by the carriage part positioning pin 6. It is possible.

After the triangular prism 9 is fixed, the mounting angle adjusting device 5 is removed from the triangular prism 9, and the mounting is completed. Further, the optical component to be adjusted for the mounting angle is not limited to the triangular prism as in this embodiment, but may be similarly used for an objective lens or a diffraction grating plate.

Note that in this embodiment, the triangular prism 9
The rotation angle center of the triangular prism does not coincide with the center of the prism 9 due to the restriction of the carriage positioning pin 6 of the mounting angle adjustment device 5, so strictly speaking, the fixed position of the triangular prism changes when adjusting the mounting angle. Put it away.

Therefore, by setting up the device so that the center of rotation of the rotary stage is the center of the triangular prism, it was possible to suppress the positional fluctuation of the triangular prism even when adjusting the mounting angle.

[0025]

As described above, according to the present invention, the reference plane for adjusting the mounting angle of optical components becomes more similar to the actual magneto-optical recording media surface. Optical components can now be attached to the carriage part while the mechanism is separated from the carriage part.

When fixing the optical component to the carriage section, the optical component is positioned at a fixed position on the carriage using the positioning pin on the mounting angle adjustment device, and the adhesive is applied from the adhesive injection port to the triangular part of the carriage section. It was decided to inject it into the gap between the prism fixing adhesive surface 21 and the side surface of the triangular prism to fix them.

[0027] As a result, the mounting angle of the optical component is
It is no longer affected by variations in the reference plane that occur between individual drives, and adjustments can now be easily made using the mounting angle adjustment screw mounted on the device. Additionally, the carriage portion is lighter, thereby reducing seek time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of an apparatus in an embodiment of the present invention.

FIG. 2 is a diagram showing the mounting angle adjustment device for optical components according to the present invention and its mechanism.

FIG. 3 is a diagram showing mounting angle adjustment in which the plane perpendicular to the rail axis is the rotation plane of the optical axis in the embodiment.

FIG. 4 is a diagram illustrating mounting angle adjustment using a plane parallel to the rail axis as the rotation plane of the optical axis in the embodiment.

FIG. 5 is a diagram showing the structure of an angle adjustment mechanism for optical components in a conventional example.

[Explanation of symbols]

1 Autocollimator 2 Glass plate 3 Spindle motor hub 4 Mounting angle adjusting screw 5 Body frame of optical component mounting angle adjusting device 6 Carriage part positioning pin 7 Rail 8 Carriage part 9 Triangular prism 10 Laser beam 11 Parallel cross beam 12 Display 13 Light Head part 14 CCD camera 15 Light source 16 Stand 17 Main chassis 18 Main chassis fixing base 19 Rotating stage 20 Horizontal plate 21 Triangular prism fixing adhesive surface 22 Adhesive injection hole 23 Laser light emission hole 24 Main chassis mounting pin 25 Positioning post 26 Triangular prism Mounting part 27 Laser light entrance hole 28 Triangular prism fixing base 29 Fixing base angle adjustment screw 30 Pivot pin 31 VCM outer yoke surface 32 Ultraviolet curing adhesive

Claims (1)

[Claims] Claim 1: In a method for installing an optical component that bends a laser optical axis in order to irradiate a media surface with laser light emitted from an optical head unit attached to a main chassis perpendicularly, a flat plate having a reflective surface is provided. is attached to the spindle motor hub on the drive, and while observing with an autocollimator whether the laser beam bent through the optical component is perpendicular to the reflective surface of the flat plate, the tilting mechanism of the optical component is adjusted. 1. A method for attaching an optical component, the method comprising: adjusting the mounting angle of the optical component using a device equipped with the above, and fixing the optical component to a carriage portion using only adhesive.