JP2001023207A - Optical pickup device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device, wherein the shapes of components are simple, and the components are provided inexpensively, and adjusting work is easy. SOLUTION: The sectional shape of an opening peripheral edge 30a is formed with an edge 30a being set as a yoke base receiving part in an optical base 1 side, on which an abutting piece 9c formed of the curved surface of the ball shape of a yoke base 9 is abutted, and the abutting piece 9c and the opening peripheral edge 30a are in linear contact. Thus, the shape of the optical base 1 becomes simple because of the edge shape of the part for receiving the yoke base 9, it is received based on linear contact and, therefore, a frictional force between the yoke receiving part and a bottom surface part is reduced, and adjustment is smoothly carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device used for reading and writing information in a disk device for recording / reproducing an optical disk on which digital information such as a compact disk (CD) is recorded. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, an optical pickup device for recording and reproducing information on and from an optical disk collects laser light emitted from a semiconductor laser in an optical integrated device as a minute spot on a recording surface of the optical disk by a reflection mirror and an objective lens. It is configured to record by light, and at the time of reproduction, the reflected light reflected from the optical disk is guided to the photoelectric conversion section in the optical integrated device by the objective lens and the reflection mirror, and the information is reproduced by the intensity of the reflected light.

FIG. 5 is an exploded perspective view showing a typical conventional optical pickup device. An optical base 1 made of a metal or a resin material has a tracking direction T of an optical disk D (see FIG. 6). Both ends are slidably supported between the access main shaft 2 and the access sub shaft 3 provided in parallel, and are movable in an access direction Ac parallel to the tracking direction T by a motor (not shown). ing. A yoke base mounting hole 18 is provided vertically through the access main shaft 2 along the access main shaft 2, and a holding spring mounting hole 19 is formed in the access sub shaft 3. Further, a recess 2 is provided at the center of the optical base 1.
0 is provided on the side surface on the side of the access sub shaft 3.
A hole 21 leading to zero is formed. The recess 20 and the inside of the hole 21 form a part of an optical path through which a laser beam described later passes. In addition, the opening periphery (edge portion) 20a of the recess 20
Has a concave cross-sectional shape as shown in detail in FIG.

A laser unit 4 provided with a semiconductor laser as a light source and a photoelectric conversion unit (both not shown) for photoelectrically converting reflected light from an optical disk is provided on the side of the access sub shaft 3 of the optical base 1. It is attached corresponding to the hole 21. The laser unit 4 has a flexible substrate 5 for supplying a current to the laser unit 4 and extracting a signal.
Is installed.

At the center of the optical base 1, the laser light emitted from the laser unit 4 is reflected toward the objective lens 6,
Further, a reflection mirror 7 forming an optical path for guiding the laser light reflected from the optical disk to the photoelectric conversion unit of the laser unit 4 is provided at an angle of 45 ° with respect to the optical axis of the objective lens 6. The optical path is formed through the hole 21 and the recess 20.

[0006] Above the reflection mirror 7, the optical base 1
A lens driving unit 8 is provided above the camera. The lens driving means 8 has a yoke base 9 mounted on the optical base 1, and a lens holding means 10 as an actuator movable section is arranged on the yoke base 9.

The yoke base 9 is formed by pressing a plate-shaped metal plate into a ring shape with an opening at the center.
Also, a pair of inner yoke pieces 9a, 9a bent upward at right angles, and a pair of inner yoke pieces on the same inner circumference as the pair of inner yoke pieces 9a, 9a are provided on the inner portion of the ring. A pair of abutting pieces 9c, 9c projecting downward at positions shifted from each other by approximately 90 ° with respect to 9a, 9a are integrally formed. Contact pieces 9c, 9c
FIG. 6 shows the bottom surface of the yoke base 9.
As shown in detail, the lower surface is formed as a spherical convex curved surface with the tip gradually inward toward the lower side, and the curved surface is formed as a concave portion 20 on the optical base 1 side. It substantially coincides with the concave curved surface of the opening peripheral edge 20a. On the other hand, the outer yoke piece 9
A pair of outer yoke pieces 9b, 9b which are bent upward at right angles to each other are formed integrally with each other. Further, a screw hole 22 is formed on the access main shaft 2 side of the yoke base 9 corresponding to the yoke base mounting hole 18 of the optical base 1, and a holding spring mounting of the optical base 1 on the access sub shaft 3 side. Projection 9d corresponding to hole 19
Are integrally formed. Also, the outer yoke pieces 9b, 9
The magnet 11 is fixedly attached to the inner surface of the b.

[0008] The yoke base 9 configured as described above has the contact pieces 9c, 9c with the opening peripheral edge 2 of the recess 20.
The optical base 1 is placed on the optical base 1 in contact with the optical base 1, and in this state, the optical base 1 is placed on the optical base 1 with screws 24 attached to the screw holes 22 through the yoke base mounting holes 18 from below. It is attached. After that, the pressing spring 25 is arranged so that the tip thereof covers a part of the protruding portion 9 d from the upper side of the yoke base 9. Screw 2
6, the pressing spring 25 is fixed, and the protruding portion 9d side is pressed by the pressing spring 25. The configuration of this portion constitutes the inclination adjusting means 26. The operation of the inclination adjusting means 26 will be described with reference to FIG. 6. Since the contact pieces 9c, 9c and the opening peripheral edge 20a of the recess 20 are formed with corresponding curved surfaces and are in surface contact,
When one end of the yoke base 9 is to be moved in the vertical direction, that is, when it is to be swung, the contact pieces 9c, 9
The gap between c and the opening peripheral edge 20a of the recess 20 is slidable to facilitate movement. Therefore, when the screwing amount of each of the two screws 24 is changed, the inclination of the yoke base 9 changes, and the inclination amount of the yoke base 9 can be adjusted in the XY directions. The pressing spring 25 always presses the yoke base 9 against the optical base 1 during and after the adjustment, and holds the yoke base 9 so as not to vibrate.

The lens holding means 10 has a lens holder 12 formed of a bobbin-shaped resin material, and has an objective lens 6 mounted at the center. In addition, rectangular holes 13 penetrating in the vertical direction corresponding to the inner yoke pieces 9a of the yoke base 9 are provided at left and right positions with the objective lens 6 therebetween.
Are formed. The size of the hole 13 is formed with a sufficient margin for the inner yoke piece 9a. The lens holder 12 is installed on the yoke base 9 such that the inner yoke piece 9a is inserted into the hole 13, but can be moved in any of the X, Y, and Z directions when installed.

The lens holder 12 is provided with a pair of tracking coils 14 at a position corresponding to one magnet 11 and a pair of focus coils 15 at a position corresponding to the other magnet 11. Further, the tracking coil 1 is provided on the focus coil 15 side.
4 and a connector 16 for supplying a current to the focus coil 15.

Next, the operation of the optical pickup device configured as described above will be described. When information is recorded on the optical disk, the laser light emitted from the semiconductor laser of the laser unit 4 is condensed and recorded as a minute spot on the recording / reproducing surface of the optical disk 2 by the reflection mirror 7 and the objective lens 6 and reproduced. In this case, the reflected light from the optical disk is guided to the photoelectric conversion unit of the laser unit 4 by the objective lens 6 and the reflection mirror 7, and is converted into an electric signal by the photoelectric conversion unit and reproduced.

If the optical disc is warped or decentered and a focus or tracking error occurs during recording / reproducing, a detecting means (not shown) detects the error and corrects it by using the focus coil 15 and the tracking coil. A control signal (supply current) is applied to the coil 14 to generate an electromagnetic force. Then, the lens holding means 10 is moved together with the objective lens 6 in the focus direction F and the tracking direction T by this electromagnetic force, and the focus shift and the tracking shift are corrected.

On the other hand, when the recording or the reproduction is completed, the control signal (supply current) to the focus coil 15 and the tracking coil 14 is cut off.

In the optical pickup device having the above-described structure, when it is necessary to adjust the optical axis angle of the objective lens 6 with respect to the optical disk (medium) at the time of manufacture or maintenance, the inclination adjusting means 26 is used. The adjustment is made by changing the screwing amount of the screw 24 in the above. That is, when the screwing amount of the screw 24 is changed, a force for moving the yoke base 9 upward or downward with respect to the optical base 1 is applied to the base yoke 9, and the yoke base 9 slides between the contact piece 9c and the opening peripheral edge 20a. The yoke base 9 tilts due to the operation, and the yoke base 9 tilts due to the tilt of the yoke base 9.
The objective lens 6 side supported by is also tilted as a whole, whereby the tilt can be adjusted by adjusting the optical axis angle with respect to the optical disc while maintaining the center of the objective lens 6.

[0015]

As described above, in the conventional optical pickup device, a concave curved surface (spherical shape) is provided in the concave portion 50 of the optical base 1 made of a metal or a resin material. Alternatively, there is a problem in that the resin molding is complicated and the parts become expensive. Further, since the contact piece 9c and the opening peripheral edge 20a are in contact by surface contact, there is a problem that the yoke base 9 is difficult to move at the time of adjusting the inclination, and is difficult to adjust.

The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to realize a simple component shape at a low cost, and also to simplify an inclination adjusting operation. An object of the present invention is to provide an optical pickup device and a manufacturing method thereof.

[0017]

In order to achieve the above object, the present invention relates to an optical pickup device, wherein a bottom surface formed by a spherical surface of a yoke base is formed by an edge-shaped portion of a yoke receiving portion in an optical base. The gist of the invention is that the support is made by substantially arc-shaped line contact. Thus, the yoke receiving portion of the optical base can be easily formed. In addition, the linear contact between the yoke receiving portion and the bottom portion reduces the frictional force between the yoke receiving portion and the bottom portion, and is expected to be able to perform a smooth optical angle adjustment. it can.

According to the first aspect of the present invention having the above aspect, the optical pickup device may include an objective lens for condensing a laser beam on an information recording medium, and an objective lens having a substantially spherical bottom surface. A yoke base that is tilt-adjusted integrally with the lens, an optical base having a substantially arc-shaped line contact portion on which the bottom portion slides during the tilt adjustment, and a light source portion of the laser light; The tilt adjustment is performed, and after the tilt adjustment, a tilt adjusting unit that holds the tilt of the yoke base is provided. With this configuration, the spherical bottom surface of the yoke base is supported on the optical base by line contact, so that the formation of the yoke receiving portion is simplified. Further, by making the yoke receiving portion and the bottom portion a line contact, the frictional force between the yoke receiving portion and the bottom portion is reduced, and the tilt adjustment can be performed smoothly.

The second aspect of the present invention is the first aspect.
In the optical pickup device described in the above, the line contact portion,
It is configured to be a conical surface or a curved surface or ridge protruding toward the bottom surface side. With this configuration, line contact between the optical base and the spherical bottom surface of the yoke base can be easily and reliably realized.

According to a third aspect of the present invention, a substantially arc-shaped line contact portion provided on an optical base having a laser light source and a bottom surface of a substantially spherical yoke base are slid. An optical pickup manufacturing method characterized in that the tilt of an objective lens is adjusted so that a laser beam is focused on an information recording medium, and the tilt is maintained. With this configuration, the manufacture of the optical base can be simplified, and the adjustment work of the optical pickup device can be simplified.

[0021]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. The same parts as those of the conventional optical pickup device will be described with the same reference numerals. FIG. 1 is an exploded perspective view showing the configuration of an optical pickup device. An optical base 1 made of a metal or a resin material is parallel to a tracking direction T of an optical disc D (see FIG. 2) as an information recording medium. The both ends are slidably supported between the access main shaft 2 and the access sub shaft 3 provided in the motor, and are movable in an access direction Ac parallel to the tracking direction T by a motor (not shown). A yoke base mounting hole 18 is provided vertically through the access main shaft 2 along the access main shaft 2.
A holding spring mounting hole 19 is formed on the side. Further, a recess 20 is provided at the center of the optical base 1, and a hole 21 leading to the recess 20 is formed on the side surface on the side of the access sub shaft 3. The recess 20 and the inside of the hole 21 form a part of an optical path through which a laser beam described later passes. In addition, recess 20
As shown in detail in FIG. 2, the opening periphery (edge portion) 30a has a cross-sectional shape formed at a right angle.

A laser unit 4 provided with a semiconductor laser serving as a light source and a photoelectric conversion unit (both not shown) for photoelectrically converting reflected light from an optical disk is provided on the side of the access sub shaft 3 of the optical base 1. It is attached corresponding to the hole 21. The laser unit 4 has a flexible substrate 5 for supplying a current to the laser unit 4 and extracting a signal.
Is installed.

At the center of the optical base 1, the laser light emitted from the laser unit 4 is reflected toward the objective lens 6,
Further, a reflection mirror 7 forming an optical path for guiding the laser light reflected from the optical disk to the photoelectric conversion unit of the laser unit 4 is provided at an angle of 45 ° with respect to the optical axis of the objective lens 6. The optical path is formed through the hole 21 and the recess 20.

Above the reflection mirror 7, the optical base 1
A lens driving unit 8 is provided above the camera. The lens driving means 8 has a yoke base 9 mounted on the optical base 1, and a lens holding means 10 as an actuator movable section is arranged on the yoke base 9.

The yoke base 9 is formed by pressing a plate-shaped metal plate into a ring shape with an opening at the center.
Also, a pair of inner yoke pieces 9a, 9a bent upward at right angles, and a pair of inner yoke pieces on the same inner circumference as the pair of inner yoke pieces 9a, 9a are provided on the inner portion of the ring. A pair of abutting pieces 9c, 9c projecting downward at positions shifted from each other by approximately 90 ° with respect to 9a, 9a are integrally formed. Contact pieces 9c, 9c
FIG. 2 shows the bottom surface of the yoke base 9.
As shown in detail in FIG. 5, the lower surface is formed as a substantially spherical convex curved surface with the tip gradually inward toward the lower side. On the other hand, on the outer portion of the ring, a pair of outer yoke pieces 9b, 9b, which are opposed to the inner yoke pieces 9a, 9a and are bent upward at right angles, respectively.
9b are integrally formed. Furthermore, the yoke base 9
A screw hole 22 is formed on the side of the access main shaft 2 corresponding to the yoke base mounting hole 18 of the optical base 1, and a holding spring mounting hole 19 of the optical base 1 is formed on the side of the access sub shaft 3. The protrusion 9d is integrally formed. Also,
A magnet 11 is fixedly attached to the inner surfaces of the outer yoke pieces 9b, 9b.

Then, the yoke base 9 having the above-described structure is configured such that the contact pieces 9c, 9c
The optical base 1 is placed on the optical base 1 in contact with the optical base 1, and in this state, the optical base 1 is placed on the optical base 1 with screws 24 attached to the screw holes 22 through the yoke base mounting holes 18 from below. It is attached. After that, the pressing spring 25 is arranged so that the tip thereof covers a part of the protruding portion 9 d from the upper side of the yoke base 9. Screw 2
8, the pressing spring 25 is attached, and the protruding portion 9d side is pressed by the pressing spring 25. The configuration of the mounting portion of the yoke base 9 constitutes the inclination adjusting means 26. FIG. 2 shows the operation of the inclination adjusting means 26.
To explain, the curved surface of the contact piece 9c and the opening edge 3 between the contact pieces 9c, 9c and the opening edge 30a of the recess 20.
It is in contact with the corner of 0a to form a substantially arc-shaped line contact portion. The line contact portion of the optical base 1 is formed of a conical surface or a curved surface or a ridgeline protruding toward the bottom surface of the yoke base 9.

Therefore, when the one end of the yoke base 9 is to be moved in the vertical direction, that is, when it is to be swung, the contact pieces 9c, 9c and the opening peripheral edge 30a of the recess 20 are to be moved.
It is easy to move between the sliding. Therefore, when the screwing amount of each of the two screws 24 is changed, the yoke base 9
Of the yoke base 9 is changed by XY.
Direction can be adjusted. Also, the holding spring 25
Always presses the yoke base 9 against the optical base 1 and holds the yoke base 9 so as not to vibrate.

The lens holding means 10 has a lens holder 12 formed of a bobbin-shaped resin material, and the objective lens 6 is mounted at the center. In addition, rectangular holes 13 penetrating in the vertical direction corresponding to the inner yoke pieces 9a of the yoke base 9 are provided at left and right positions with the objective lens 6 therebetween.
Are formed. The size of the hole 13 is formed with a sufficient margin for the inner yoke piece 9a. The lens holder 12 is installed on the yoke base 9 such that the inner yoke piece 9a is inserted into the hole 13, but can be moved in any of the focus direction and the tracking direction in the installed state.

The lens holder 12 is provided with a pair of tracking coils 14 at positions corresponding to the one magnet 11 and a pair of focus coils 15 at positions corresponding to the other magnet 11. Further, the tracking coil 1 is provided on the focus coil 15 side.
4 and a connector 16 for supplying a current to the focus coil 15.

Then, an optical pickup device is assembled,
In manufacturing, the laser light is condensed on the optical disk by sliding a substantially arc-shaped line contact portion provided on the optical base 1 having a laser light source and a bottom surface of the substantially spherical yoke base 9. The tilt of the objective lens 6 is adjusted so that the tilt is maintained.

Next, the operation of the optical pickup device configured as described above will be described. When information is recorded on the optical disk, the laser light emitted from the semiconductor laser of the laser unit 4 is condensed and recorded as a minute spot on the recording / reproducing surface of the optical disk 2 by the reflection mirror 7 and the objective lens 6 and reproduced. In this case, the reflected light from the optical disk is guided to the photoelectric conversion unit of the laser unit 4 by the objective lens 6 and the reflection mirror 7, and is converted into an electric signal by the photoelectric conversion unit and reproduced.

If the optical disc has a warp or an eccentricity, and a focus shift or a tracking shift occurs during recording / reproducing, a detecting means (not shown) detects this and corrects the focus coil 15 and the tracking coil so as to correct them. A control signal (supply current) is applied to the coil 14 to generate an electromagnetic force. Then, the lens holding means 10 is moved together with the objective lens 6 in the focus direction F and the tracking direction T by this electromagnetic force, and the focus shift and the tracking shift are corrected.

On the other hand, when the recording or reproduction is completed, the control signal (supply current) to the focus coil 15 and the tracking coil 14 is cut off.

Further, in the optical pickup device thus configured, when it is necessary to adjust the optical axis angle of the objective lens 6 with respect to the optical disk (medium) at the time of its manufacture or maintenance, the inclination adjusting means 26 The adjustment is made by changing the screwing amount of the screw 24 in the above. That is, when the screwing amount of the screw 24 is changed, a force for moving the yoke base 9 upward or downward with respect to the optical base 1 is applied to the yoke base 9, and the yoke base 9 slides between the contact piece 9c and the opening peripheral edge 30a. The yoke base 9 tilts due to the operation, and the yoke base 9 tilts due to the tilt of the yoke base 9.
The side of the objective lens 6 supported by is tilted as a whole, whereby the optical axis angle with respect to the optical disk can be adjusted while maintaining the center of the objective lens 6.

Therefore, in the optical pickup device of the first embodiment, the opening peripheral edge 30a of the recess 20 of the optical base 1 made of metal or resin is formed so that the cross-sectional shape becomes a right angle. In the case of metal working, the cutting work and the like are simplified, and in the case of resin molding, the manufacture of a molding die and the like are simplified. As a result, the cost can be reduced and the cost can be reduced. On the other hand, when adjusting the inclination of the yoke base 9, the contact piece 9c is also required.
And the opening edge 30a are in line contact with each other, so that the frictional force between the opening edge 30a and the contact piece 9c is reduced, the sliding operation is performed smoothly, and the inclination of the yoke base 9 is adjusted. Can be done easily. As a result, smooth optical angle adjustment, that is, tilt adjustment can be performed.

(First Modification) Next, a first modification of the inclination adjusting means 26 according to the embodiment of the present invention will be described with reference to FIG. In the first modified example, the opening periphery (edge portion) 30a of the optical base 1 is formed in a cross-sectional shape having an inclined surface toward the center as it goes inward. In this structure, the contact piece 90c having a spherical shape comes into contact with the inclined surface of the opening peripheral edge 30a in line contact.

Therefore, even in the structure of the first modified example, the opening periphery (edge portion) 30a of the concave portion 20 of the optical base 1 made of a metal or a resin material has an inclined surface in a cross-sectional shape, but becomes a right angle. Since it is formed as such, in the case of metal working, the cutting work etc. becomes easy,
In the case of resin molding, production of a molding die and the like are simplified.
Thus, the cost can be reduced and the cost can be reduced. On the other hand, even when the inclination of the yoke base 9 is adjusted, the frictional force between the opening rim 30a and the contact piece 9c is reduced because the contact piece 9c and the opening rim 30a are in line contact with each other. As a result, the sliding operation is performed smoothly, and the inclination of the yoke base 9 can be easily adjusted.
As a result, smooth optical angle adjustment can be performed.

(Second Modification) Next, a second modification of the inclination adjusting means 26 according to the embodiment of the present invention will be described with reference to FIG. In the second modification, the optical base 1
Is formed in a cross-sectional shape having a curved surface protruding toward the contact piece 9c. In this structure, the contact piece 9 having a spherical shape is used.
0c is in contact with the curved surface of the opening peripheral edge 30a in line contact.

Therefore, also in the structure of the second modified example, the opening periphery (edge portion) 30a of the concave portion 20 of the optical base 1 made of a metal or a resin material is formed so as to have a convex curved surface in a sectional shape. Therefore, when metal processing is performed, cutting processing and the like are simplified, and when resin molding is performed, manufacturing of a molding die and the like are simplified. Thus, the cost can be reduced and the cost can be reduced. On the other hand, even when the inclination of the yoke base 9 is adjusted, the contact piece 9c and the opening peripheral edge 30a are in contact with each other by line contact.
As a result, the frictional force between the opening peripheral edge 30a and the contact piece 9c is reduced, the sliding operation is performed smoothly, and the inclination of the yoke base 9 can be easily adjusted. As a result, smooth optical angle adjustment can be performed. In the case of the structure of the second modification, the bottom surface of the contact piece 9c may not be formed as a curved surface but may be formed as an inclined surface.

[0040]

As described above, according to the optical pickup device of the present invention, the bottom surface formed by the spherical surface of the yoke base is supported by line contact at the edge of the yoke receiving portion of the optical base. Therefore, the formation of the yoke receiving portion is simplified. In addition, the linear contact between the yoke receiving portion and the bottom portion reduces the frictional force between the yoke receiving portion and the bottom portion, and is expected to be able to perform a smooth optical angle adjustment. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of an optical pickup device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a peripheral structure of a tilt adjusting unit according to the embodiment;

FIG. 3 is a diagram showing a first modification of the tilt adjusting means according to the embodiment.

FIG. 4 is a diagram showing a second modification of the inclination adjusting means according to the embodiment.

FIG. 5 is an exploded perspective view showing a schematic configuration of a conventional optical pickup device.

FIG. 6 is a diagram illustrating a peripheral structure of a tilt adjusting unit in a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical base 2 Access main shaft 3 Access sub shaft 4 Laser unit 5 Flexible board 6 Objective lens 7 Reflection mirror 8 Lens drive means 9 Yoke base 9a Inside projection 9b Outside projection 9c Contact piece (bottom part) 9d Projection Part 10 Lens holding means 11 Magnet 12 Lens holder 13 Hole 14 Tracking coil 15 Focus coil 16 Connector 18 Yoke base mounting hole 19 Pressing spring mounting hole 20 Depression 20a Opening periphery 21 Hole 22 Screw hole 23 Projecting portion 24 Screw 25 Pressing spring 26 Tilt adjusting means 27 Mounting hole 28 Screw 30a Opening edge D Optical disk T Tracking direction Ac Access direction

Claims (3)

[Claims] 1. An objective lens for converging a laser beam on an information recording medium, a yoke base having a substantially spherical bottom surface, the inclination of which is adjusted integrally with the objective lens; An optical base having a substantially arc-shaped line contact portion on which the bottom portion slides at the time and a light source portion of the laser light,
An optical pickup device comprising: a tilt adjusting unit that performs the tilt adjustment and holds the tilt of the yoke base after the tilt adjustment. 2. The optical pickup device according to claim 1, wherein the line contact portion is a conical surface or a curved surface or a ridge protruding toward the bottom surface. 3. A laser beam is collected on an information recording medium by sliding a substantially arc-shaped line contact portion provided on an optical base having a laser light source and a bottom portion of a substantially spherical yoke base. A method for manufacturing an optical pickup, comprising: adjusting an inclination of an objective lens so as to emit light, and maintaining the inclination.