JP2001014699A - Objective lens drive assembly and its assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the inclination of an objective lens by regulating a holder for supporting the other end of an elastic supporting member which supports a bobbin in the relative position with a magnetic circuit in the radial direction of a disk and/or a direction perpendicular to the disk, then fixing the holder to the magnetic circuit. SOLUTION: The shafts 16 of an assembly jig 15 are inserted into long holes 14 of the holder 9 and the spacing between the shafts 16 is widened by moving a shaft holder 17. The holder 9 is chucked by the shafts 16. Wires 8 fixed to the holder 9 and the moving parts supported at their front ends are changed in the relative position with the magnetic circuit consisting of a magnet 7 and a yoke 6 by the movement of a bed 47 of the assembly jig 15. Current of a low frequency is passed to a focusing coil 4 and while the inclination of the objective lens 2 is monitored by an autocollimator, etc., the bed 47 is moved and the position where the inclination in the tracking direction of the objective lens 2 does not exist any more is searched. When the position is determined, the holder 9 and the rising part 13 of the yoke 6 are fixed with an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device used for a disk drive and a method of manufacturing the same.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 2-132646 discloses an example of a measure for reducing the lens tilt in an objective lens driving device used in a disk drive.

[0003]

An objective lens driving device,
Also, when reproducing or recording data on the disk by the optical device, if the axis of the light incident on the objective lens and the objective lens are inclined, aberration is generated in the spot formed on the disk. For this reason, it is necessary to reduce the inclination of the objective lens as much as possible. In particular, in recent years, there is a tendency to use an objective lens having a large numerical aperture in order to improve the recording density of an optical disk device. For this reason, strict accuracy is required for the relative angle shift amount between the objective lens and the disk.

The objective lens driving device described in the above-mentioned prior art suppresses the inclination when the lens moves by cutting off a part of a magnet constituting a magnetic circuit to form a magnetic flux distribution. . However, in this method, the power of the magnet is reduced by cutting out the magnet, and the magnetic flux itself is reduced as a whole, so that the sensitivity is reduced.

[0005] In the objective lens driving device, a method of supporting a portion (hereinafter, referred to as a movable portion) which holds the objective lens and moves in a direction perpendicular to the disk and in a radial direction of the disk is an elastic support using a wire. The method is currently the most frequently used. The objective lens driving device described in the above prior art is of a so-called moving coil type, in which a movable portion including an objective lens, a bobbin, a focusing coil, a tracking coil and the like is elastically cantilevered by a wire. Further, a portion that supports the movable portion via a wire (hereinafter, referred to as a fixed portion) includes a magnetic circuit including a yoke and a magnet, and a holder fixed to the yoke. The wire is made of a conductive material,
When a current flows through the focus coil and the tracking coil via the wire, the current flows in a magnetic flux formed by a magnetic circuit including a yoke and a magnet, so that a force for displacing the movable portion is generated. This force causes the movable part to move in the direction perpendicular to the disk and in the disk radial direction.

In the above prior art, the movable portion is supported using four wires. These four wires are arranged substantially in parallel. The fixed points of the wires on both the movable part side and the fixed part side are arranged at the positions of the four vertices of the rectangle. When the intersections of the diagonal lines of the four fixed points of the wire deviate from the center of the magnet, a moment is applied to the movable part as the movable part moves in the focusing direction or the tracking direction, and the movable part tilts. For this reason, there is a problem that the objective lens is tilted with respect to the disk and aberration occurs.

[0007]

SUMMARY OF THE INVENTION An objective lens for recording or reproducing information on a disk, a bobbin holding the objective lens, a focusing coil for generating a force for driving the bobbin in a focusing direction, and a tracking direction. A tracking coil that generates a force to drive the bobbin, a magnetic circuit that generates a magnetic flux acting on the focusing coil and the tracking coil,
An elastic support member for supporting the bobbin at one end, and a holder for supporting the other end of the elastic support member, wherein the holder moves a relative position with respect to the magnetic circuit in a disk radial direction and / or a direction perpendicular to the disk. The holder has a movement range in which the holder can move in the direction, and the holder is positioned and fixed after adjusting a relative position with respect to the magnetic circuit in a disk radial direction and / or a direction perpendicular to the disk.

Further, the objective lens driving device has a base having the magnetic circuit, and moving means for moving the holder in a disk radial direction and / or in a direction perpendicular to the disk. After the relative position of the base with the magnetic circuit is adjusted by moving the moving means in the radial direction of the disk and / or in the direction perpendicular to the disk, the positioning is fixed to the base.

The magnetic circuit has a movement range in which a relative position with respect to the holder can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the magnetic circuit has a relative position with respect to the holder. After the position is adjusted in the disk radial direction and / or the direction perpendicular to the disk, the positioning is fixed.

Further, the objective lens driving device has a base for fixing and supporting the holder, and moving means for moving the holder in a disk radial direction and / or in a direction perpendicular to the disk. The circuit is positioned and fixed to the base after being adjusted by moving the relative position with respect to the holder fixedly supported by the base in the disk radial direction and / or the direction perpendicular to the disk by the moving means. .

The holder has a movement range in which a relative position with respect to the magnetic circuit can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the holder has a relative position with respect to the magnetic circuit. An assembling method is adopted in which the position is adjusted in the radial direction of the disk and / or in the direction perpendicular to the disk, and then the positioning is fixed.

Further, the objective lens driving device has a base having the magnetic circuit, and moving means for moving the holder in a disk radial direction and / or in a direction perpendicular to the disk. An assembling method of adjusting the relative position of the base with respect to the magnetic circuit by moving the moving means in the disk radial direction and / or in the direction perpendicular to the disk, and then positioning and fixing the base to the base. .

Further, the magnetic circuit has a movement range in which a relative position with respect to the holder can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the magnetic circuit has a relative position with respect to the holder. An assembling method is adopted in which the position is adjusted in the radial direction of the disk and / or in the direction perpendicular to the disk, and then the positioning is fixed.

Further, the objective lens driving device has a base for fixedly supporting the holder, and moving means for moving the holder in a radial direction of the disk and / or in a direction perpendicular to the disk. The circuit is positioned and fixed to the base after being adjusted by moving the relative position with respect to the holder fixedly supported by the base in the disk radial direction and / or the direction perpendicular to the disk by the moving means. Take the assembly method.

The objective lens driving device has a connecting member mounted on a base having the magnetic circuit and holding the holder, and the connecting member has at least a surface mounted on the base. It has one projection and the base is
The connecting member mounting surface has a fitting shape having a linear shape that fits with the protrusion and extends in the disk radial direction, and the connecting member is configured such that the protrusion moves along the linear shape of the fitting shape. The disk can be moved in the disk radial direction while holding the holder.

Further, the objective lens driving device has a connecting member mounted on a base having the magnetic circuit and holding the holder, and the base has at least one connecting surface on the connecting member mounting surface. Having the number of protrusions, and the connecting member has a fitting shape having a linear shape extending in the radial direction of the disc while fitting with the protrusion on a surface placed on the base. By moving the projection along the linear shape of the fitting shape, the projection can be moved in the disk radial direction while holding the holder.

Further, the connecting member has a rising portion in a direction perpendicular to the disk, and the rising portion of the connecting member contacts and holds the holder, and the holder of the rising portion of the connecting member holds the holder. A fitting shape having at least one protrusion on a mounting surface to be held, and the holder having a linear shape extending in a direction perpendicular to the disk while being fitted with the protrusion on a surface contacting a rising portion of the connecting member. And the holder is movable in a direction perpendicular to the disk by the protrusion moving along the linear shape of the fitting shape.

The connecting member has a rising portion in a direction perpendicular to the disk. The rising portion of the connecting member contacts and holds the holder, and the holder has a rising portion of the connecting member. The connecting member has a linear shape that fits with the protrusion and extends in a direction perpendicular to the disk on a mounting surface of the rising portion that holds the holder. The holder has a fitting shape, and the holder is movable in a direction perpendicular to the disk by the protrusion moving along the linear shape of the fitting shape.

Further, the holder has at least one screw hole for disposing a screw capable of adjusting the movement of the holder in a direction perpendicular to the disk.

Further, the objective lens driving device has a spring for urging the holder and the connecting member in a direction to press the connecting member on the connecting member mounting surface of the base.

In the objective lens driving device, the connecting member may be moved and adjusted in the radial direction of the disk on the connecting member mounting surface of the base, and then positioned and fixed, and the holder may be mounted on the holder mounting surface of the connecting member. An assembling method of positioning and fixing after moving and adjusting in the direction perpendicular to the disk above is adopted.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, FIGS. 1 to 5 and FIGS.
The first embodiment of the present invention will be described below.

FIG. 3 is an exploded perspective view showing the objective lens driving device 1 according to the first embodiment of the present invention.

In FIG. 3, a bobbin 3 has an objective lens 2
Is mounted, and a focusing coil 4 is disposed at the center of the bobbin 3. The focusing coil 4 is formed of an air-core coil having a rectangular cross section, and is adhered and fixed to the bobbin 3. A pair of tracking coils 5 is attached to the surface of the focusing coil 4 in the longitudinal direction. The tracking coil 5 is a rectangular air-core coil. The objective lens 2, bobbin 3, focusing coil 4, and tracking coil 5 move integrally. Hereinafter, this is referred to as a movable portion 12. The ends of the focusing coil 4 and the tracking coil 5 are electrically connected to four elastic wires 8.

Reference numeral 6 denotes a yoke. A magnet 7 is attached to a rising portion at the center of the yoke, and an upper yoke 11 is further attached to form a magnetic circuit.

The objective lens driving device 1 according to the present embodiment
The movable part is supported using four wires. These four wires 8 are arranged substantially in parallel. Also, the movable part 1
The fixing points of the wire 8 are arranged at the positions of the four vertices of the rectangle on both the second side and the holder 9 side.

Reference numeral 9 denotes a holder. The holder 9 is fixed to the yoke 6 by an adhesive described later. Reference numeral 13 denotes a side surface rising portion formed on the yoke 6 so as to sandwich the holder 9 for bonding and fixing the holder 9 to the yoke 6.
The box 45 of the holder 9 is filled with a viscoelastic material (not shown) in order to reduce unnecessary vibration generated in the wire 8.

FIG. 4 is a plan view of the objective lens driving device according to the present embodiment. The two magnets 7 are arranged so that the longitudinal direction of the focusing coil 4 and the tracking coil 5 are interposed therebetween, and that the magnetic flux acts on the surface of the focusing coil 4 in a direction substantially perpendicular to the longitudinal direction. Also,
Arrow B indicates the radial direction of the disc (not shown), that is, the tracking direction.

In the left and right direction of the holder 9 in FIG. The holder 9 and the rising portion 13 have a predetermined gap as shown in FIG.
The holder 9 is movable in the direction of arrow B, that is, in the disk radial direction.

Reference numeral 14 denotes a hole into which a shaft of a position adjusting jig of the holder 9 described later is inserted. Reference numeral 18 denotes an adhesive for fixing the holder 9 to the rising portion 13 of the yoke 6.

FIG. 5 is a side sectional view of the objective lens driving device according to the present embodiment. The focusing coil 4 and the tracking coil 5 are positioned so as to be sandwiched between two magnets 7 attached to the center rising portion of the yoke 6. Arrow A indicates a direction perpendicular to the disc (not shown), that is, a focusing direction.

The yoke 6 and other parts are not located in the vertical direction of the holder 9 in FIG.
Can move in the direction of arrow A, that is, in the direction perpendicular to the disk.

As described above, the holder 9 has a movable range in which the relative position with respect to the magnetic circuit composed of the yoke 6 and the two magnets 7 can be moved in the radial direction of the disk and in the direction perpendicular to the disk. The bobbin 3 has a movable range that is substantially the same as that of the holder 9 in the radial direction of the disk and in a direction perpendicular to the disk, in addition to the predetermined movable range. As will be described later, the holder 9 is positioned and fixed to the side surface rising portion 13 of the yoke 6 by the adhesive 18 shown in FIG. 4 after adjusting the relative position with respect to the magnetic circuit in the disk radial direction and the direction perpendicular to the disk. You.

When a current is applied to the focus coil 4 and the tracking coil 5 through the wire 8, the yoke 6, the magnet 7
Current flows in the magnetic flux created by the magnetic circuit formed by the magnetic field, a force that displaces the movable portion 12 is generated. This force causes the movable portion 12 to move in the direction of arrow A, that is, in the direction perpendicular to the disk, and in the direction of arrow B, that is, in the radial direction of the disk.

Next, with reference to FIGS. 8 and 9, a description will be given of the lens tilt caused by the relative position shift between the magnet and the coil.

FIG. 8 shows the focusing coil 4 and the magnet 7.
FIG. 6 is a schematic diagram viewed from the direction of arrow P in FIG. 4 or FIG. In FIG. 8 (5), the tracking coil 5 is also indicated by a dotted line.

FIG. 8 (5) is a sectional view of the wire 8 shown in FIG.
The case where the intersection (Gwire) of the diagonal lines of the two fixed points (the movable part 12 side and the holder 9 side) coincides with the center (Gmag) of the magnet 7 is shown. Here, focusing coil 4
When a current is supplied to the focusing coil 4, a force is generated mainly in the longitudinal direction of the focusing coil 4 (a portion sandwiched between two magnets 7 in FIGS. 4 and 5). That is, in the focusing coil 4 of FIG. 8 (5), a force is mainly generated in a hatched area. On the other hand, the magnetic flux distribution of the magnet 7 is substantially maximum at the center (Gmag) of the magnet 7. For this reason, when viewed from the direction shown in FIG. 8, the point of application of the force generated in the focusing coil 4 may be considered to be equivalent to the center (Gmag) of the magnet 7 equivalently. This force point is defined as Pfomx.

FIG. 8 (5) shows that Gwire and Gmag match as described above. Therefore, when the focusing coil 4 is energized, the focusing coil 4 moves straight upward in FIG. 8 as shown in FIG. 8 (2) or straight downward in FIG. 8 as shown in FIG. I do. With this movement, the movable portion 12 moves in the direction of arrow A in FIG. 5, that is, in the direction perpendicular to the disk, without tilting. Thus, the objective lens 2 does not tilt.

FIG. 8D shows a case where the focusing coil 4 is shifted from the magnet 7 by ΔL to the left in FIG. This displacement is caused by various mounting errors during assembly, such as mounting errors of the magnets 7, mounting errors of the wires 8, and dimensional errors of the bobbin 3, and dimensional errors of each part. In this case, Gmag and Pfomx are shown in FIG.
Similar to (5), but Gwire is equal to Gmag (= Pfom
x) and ΔL. For this reason, when the focusing coil 4 is energized to generate, for example, a force for moving the focusing coil 4 upward in FIG. 8, the force is applied to Pfomx, so that the force rotates in the counterclockwise direction in FIG. A moment is generated.

As shown in FIG. 8A, the focusing coil 4 tilts counterclockwise in FIG. 8 in the radial direction of the disk with the upward movement in FIG. Therefore, the movable part 12
Tilts with movement in the direction perpendicular to the disk, and the objective lens 2 also tilts. FIG. 8 (7) shows a case where a force for moving the focusing coil 4 downward in FIG. 8 is generated from the state of FIG. 8 (4).
Rotate clockwise in FIG. 8 around the wire. Accordingly, the objective lens also tilts.

FIG. 8 (6) shows a case where the focusing coil 4 is shifted from the magnet 7 by ΔL to the right in FIG. When a current is applied to the focusing coil 4 to generate a force for moving the focusing coil 4 upward in FIG. 8, a moment is generated in the clockwise rotation direction in FIG. 8 around Gwire. Focusing coil 4
8 tilts counterclockwise in FIG. 8 with the upward movement in FIG. 8, as shown in FIG. 8 (3). FIG. 8 (9)
This is a case where a force for moving the focusing coil 4 downward in FIG. 8 is generated from the state (6), and the focusing coil 4 rotates clockwise in FIG. 8 around Gwire. The rotation of the focusing coil 4 shown in (3) and (9) of FIG. 8 tilts the objective lens 2 in the disk radial direction.

FIG. 9 is a schematic view of the tracking coil 5 and the magnet 7 as viewed from the direction of the arrow P in FIG. 4 or FIG. In FIG. 9 (5), the focusing coil 5 is also indicated by a dotted line.

FIG. 9 (5) is a sectional view of the wire 8 shown in FIG.
The case where the intersection (Gwire) of the diagonal lines of the two fixed points (the movable part 12 side and the holder 9 side) coincides with the center (Gmag) of the magnet 7 is shown. Here, when the tracking coil 5 is energized, the force is mainly applied to a portion extending in a direction perpendicular to the disks inside the two tracking coils 5 (a portion sandwiched between the two magnets 7 in FIGS. 4 and 5). ). That is, in the tracking coil 5 of FIG. 9 (5), a force is mainly generated in a hatched area. On the other hand, the magnetic flux distribution of the magnet 7 is approximately the center (Gmag) of the magnet 7 as described above.
At the maximum. For this reason, when viewed from the direction shown in FIG. 9, the applied point of the force generated in the tracking coil 4 is equivalently equivalent to the center (Gmag) of the magnet 7 in the vertical direction of FIG. 9, that is, the direction perpendicular to the disk. You can think about it. This force point is set to Pfomx as in FIG.

In FIG. 9 (5), Gwire and Gmag match as described above. For this reason, when the tracking coil 5 is energized, the tracking coil 4 is caused by the generated force, as shown in FIG.
Alternatively, as shown in FIG. 9 (6), the user moves straight to the right in FIG. With this movement, the movable portion 12 moves in the direction of arrow B in FIG. Therefore, the objective lens 2 does not tilt.

FIG. 9B shows a case where the tracking coil 5 is shifted from the magnet 7 by ΔL upward in FIG.
This deviation is also caused by various mounting errors during assembly and dimensional errors of each part. In this case, Gmag and Pfomx match in the direction perpendicular to the disk as in FIG. 9 (5), but Gwire is equal to Gma.
g (= Pfomx) by the focusing direction ΔL.
For this reason, when the tracking coil 5 is energized to generate, for example, a force for moving the tracking coil 5 to the left in FIG. 9, the force is applied to Pfomx, so that the clockwise rotation in FIG. A moment is generated.

As shown in FIG. 9A, the tracking coil 5 tilts clockwise in FIG. 9 as it moves to the left in FIG. For this reason, the movable part 12 is tilted with the movement in the tracking direction, and the objective lens 2 is also tilted in the disk radial direction. FIG. 9C shows a case where a force for moving the tracking coil 5 to the right in FIG. 9 is generated from the state of FIG. 9B, and the tracking coil 5 is counterclockwise in FIG. Rotate around. Accordingly, the objective lens also tilts.

FIG. 9 (8) shows a case where the tracking coil 5 is shifted from the magnet 7 by ΔL downward in FIG.
When the tracking coil 5 is energized to generate a force for moving the tracking coil 5 to the left in FIG.
A moment is generated in the direction of rotation counterclockwise in FIG. The tracking coil 5 is shown in FIG.
As shown in FIG. 9 (7), as shown in FIG.
Tilt counterclockwise. FIG. 8 (9) shows a case where a force for moving the tracking coil 5 to the right in FIG. 9 is generated from the state of FIG. 8 (8).
It rotates clockwise in FIG. 9 around Gwire. FIG.
The rotation of the focusing coil 4 shown in (7) and (9) also tilts the objective lens 2 in the disk radial direction.

FIG. 2 shows an objective lens driving device 1 and a jig 1 for assembling the objective lens driving device 1 according to the present embodiment.
5 is a perspective view of the objective lens driving device 1 as viewed from below. The jig 15 includes two shafts 16, each shaft 16.
And a base 47 on which the shaft holder is placed. FIG. 2 shows an assembly jig 1
5 shows a state immediately before the shaft 16 of No. 5 is inserted into the hole 14 for inserting the shaft 16 of the holder 9. The holder 9 is held at the position shown in FIG. 2 by another jig (not shown). From the state shown in FIG. 2, the base 47 of the jig 15 is moved in the direction of arrow A in FIG. 2 by driving means (not shown). Accordingly, the shaft 16 of the jig 15 is inserted into the hole 14 from below the holder 9. Here, the hole 14 is an elongated hole as shown in FIG. 2, and the shaft 16 is inserted substantially at the center of the elongated hole 14. When the shaft 16 is inserted into the hole 14 up to the position of the step 46, the movement of the base 47 in the direction of the arrow A temporarily stops. The position of the holder 9 in the direction of the arrow A is determined by the position of the step 46 of the shaft 16.

Next, the shaft holder 17 is moved by a driving means (not shown) so that the shafts 16 move toward each other or away from each other, that is, in the direction of arrow B. The movement of the shaft holder 17 stops when the shaft 16 comes into contact with the edge of the elongated hole 14, and the holder 9 is completely chucked by the shaft 16 in this state. At the same time that the holder 9 is completely chucked by the shaft 16, the holder 9 is fixed by a jig (not shown).
Is released. FIG. 1 is a perspective view showing the state at this time. That is, the holder 9, the wire 8 fixed to the holder 9, and the movable portion 12 attached to the tip of the wire 8 move with the movement of the base 47 of the jig 15. On the other hand, the yoke 6 to which the magnet 7 is attached is completely fixed by another fixing jig (not shown), and does not interlock with the movement of the jig 15.

In this state, while monitoring the inclination of the objective lens 2 by a method such as an autocollimator, for example, a current is first applied to the focusing coil 4 to move the movable portion 12 in the direction of arrow A, that is, in the direction perpendicular to the disk. Operate continuously. That is, the movable section 12 is vibrated at a very low frequency in the direction of arrow A. As shown in FIG. 8, the focusing coil 4 and the magnet 7 move in the tracking direction (arrow B).
(A direction), the state in which the objective lens 2 is tilted in the disk radial direction is monitored. From this state, the base 47 of the jig 15 is moved in the direction of arrow B in FIG. 2 by a driving unit (not shown). Along with this movement, the holder 9 and the movable part 12 supported by the holder 9 by the wire 8 move. Therefore, the relative position of the focusing coil 4 and the magnet 7 in the tracking direction changes.

Then, when the holder 9 reaches a position where the displacement ΔL shown in FIG. 8 disappears, the objective lens 2 does not tilt in the disk radial direction. Here, the base 47 of the jig 15
The adjustment movement in the direction of arrow B is stopped. Next, a current is applied to the tracking coil 5 to move the movable portion 12 continuously in the direction of arrow B, that is, in the radial direction of the disk. That is, the movable section 12 is vibrated at a very low frequency in the direction of arrow B.

When there is a shift ΔL between the tracking coil 5 and the magnet 7 in the direction of arrow A in FIG. 8, the objective lens 2 tilts in the radial direction of the disk. The relative position of the tracking coil 5 and the magnet 7 in the direction of arrow A is changed by moving the base 47 of the jig 15 in the direction of arrow A in FIG. When ΔL disappears, the objective lens 2 does not tilt in the disk radial direction. here,
The adjustment movement of the base 47 of the jig 15 in the direction of arrow A is stopped. In this state, the holder 9 and the side portion 13 of the yoke 6 are raised.
An adhesive 18 is applied to a gap between the holder 9 and the holder 9, and the holder 9 is fixed to the yoke 6. Subsequently, the yoke 6 of the objective lens driving device 1 is fixed to a predetermined position of a pickup case (carriage) in a disc device (not shown).

In the process according to the present embodiment, first, a current is applied to the focusing coil 4 to move the base 47 of the jig 15 in the direction of the arrow B, and the focusing coil 4 is moved.
Then, the relative position of the tracking coil 5 and the magnet 7 is adjusted by applying a current to the tracking coil 5 and moving the base 47 of the jig 15 in the direction of the arrow A. The relative position in the direction of arrow A was adjusted. However, there is no problem if this order is reversed.

Further, in the process according to the present embodiment, before the holder 9 is completely held by the jig 15, there is a jig (not shown) for holding the holder 9 at the position shown in FIG. After the holder 9 was completely chucked, the holding of the jig (not shown) was released.
May be attached from the beginning to the jig 15 and held at the position shown in FIG.

Although the holder 9 is fixed to the yoke 6 with the adhesive 18 in the present embodiment, the holder 9 may be directly bonded to a case (carriage) of an optical pickup (not shown). At this time, the magnetic circuit portion of the yoke 6 to which the magnet 7 is attached may also be directly fixed to an optical pickup case (not shown).

In this embodiment, the relative position of the tracking coil 5 and the magnet 7 in the direction perpendicular to the disk is optimized when the objective lens driving device 1 is placed horizontally. This means that the tracking coil 5 at the position where the movable portion 12 has settled under its own weight has been optimized. When the objective lens driving device 1 is placed vertically,
It is necessary to optimize the tracking coil 5 at a position where the movable portion 12 does not sink under its own weight. Also horizontal,
It is needless to say that if both of the vertical directions are possible, the adjustment must be made so as to obtain an intermediate characteristic between the both optimal states.

According to the present embodiment, even if the assembling accuracy of each component and the dimensional accuracy of each component are relaxed without increasing the number of components from the conventional objective lens driving device, the objective lens 2 can be moved in the radial direction of the disk. Can be greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 6 is an exploded perspective view of the objective lens driving device 1 according to the second embodiment of the present invention as viewed from below.

Reference numeral 48 denotes a base for holding the holder 9 and a magnetic circuit described later. From this state, the holder 9
It is mounted on the holder 9 mounting portion 20 of the base 48 and is fixed at a predetermined position on the base 48 by screws (not shown). 22
Are holes for screw penetration provided in the holder 9. Reference numeral 21 denotes a fixing screw hole provided on the base 48. When the holder 9 is fixed to the holder 9 mounting portion 20 of the base 48, the position of the holder 9 with respect to the base 48 is determined by fitting the projection 23 of the holder 9 into the notch 24 of the base 48. Can be By fixing the holder 9 to the base 48, the movable part 12 on which the focusing coil 4 and the tracking coil 5 are mounted is also supported at a predetermined position with respect to the base 48. 19 is a yoke to which the magnet 7 is attached and which forms a magnetic circuit. On the base 48,
A hole 49 into which the yoke 19 is inserted is provided.

FIG. 7 is a perspective view of the objective lens driving device 1 and the jig 15 for assembling the objective lens driving device 1 according to the present embodiment as viewed from below the objective lens driving device 1. The jig 15 includes two shafts 16 and each shaft 1.
And a base 47 on which the shaft holder is placed.

FIG. 7 shows the shaft 16 of the assembly jig 15.
Shows a state immediately before being inserted into the hole 14 for inserting the shaft 16 of the holder 9. The yoke 19 is held at the position shown in FIG. 7 by another jig (not shown). From the state shown in FIG. 7, the base 47 of the jig 15 is moved in the direction of arrow A in FIG. 7 by driving means (not shown). Accordingly, jig 1
5 has a notch 2 from below the yoke 19.
5 is inserted. Here, the notch 25 is an elongated hole with one side opened as shown in FIG. Shaft 16
However, when the base 47 is inserted into the hole 14 up to the position of the step 46, the movement of the base 47 in the direction of the arrow A temporarily stops. Holder 9
Is determined by the position of the step 46 of the shaft 16 in the direction of the arrow A.

Next, the shaft holder 17 is moved by a driving means (not shown) so that the shafts 16 move in directions approaching each other. When the shaft 16 abuts on the inner edge of the notch 25, the movement of the shaft holder 17 stops, and the yoke 19 is completely chucked by the shaft 16 in this state. At the same time that the holder 9 is completely chucked by the shaft 16, the holding of the holder 9 by the jig (not shown) is released. That is, the yoke 19 and the magnet 7 fixed to the yoke 19 are
It moves with the movement of the base 47 of No. 5. On the other hand, base 48
Is completely fixed by another fixing jig (not shown), and does not interlock with the movement of the jig 15. Therefore, the holder 9 fixed to the base and the movable part 12 supported by the holder are also required.
It does not accompany the movement of the jig 15.

Here, in the direction of arrow B in FIG. 7 of the yoke 19, there is a predetermined gap between the yoke 19 and the edge of the hole 49 of the base 48 as shown in FIG. That is, it can be moved in the disk radial direction. The groove 50 of the hole 49 is a relief for the shaft 16 to move in the direction of arrow B. No other parts are located below the yoke 19 in the direction of arrow A. Also, the arrow A of the yoke 19
The movable part 12 is located above the direction, but has a movable range for adjusting the position of the yoke 19 in the direction of arrow A. Therefore, the yoke 19 is movable in the direction of arrow A, that is, in the direction perpendicular to the disk.

In this state, while monitoring the inclination of the objective lens 2 by a method such as an autocollimator, for example, a current is first applied to the focusing coil 4 to move the movable portion 12 in the direction of arrow A, that is, in the direction perpendicular to the disk. Operate continuously. That is, the movable section 12 is vibrated at a very low frequency in the direction of arrow A. As shown in FIG. 8, the focusing coil 4 and the magnet 7 move in the tracking direction (arrow B).
(A direction), the state in which the objective lens 2 is tilted in the disk radial direction is monitored. From this state, the base 47 of the jig 15 is moved in the direction of arrow B in FIG. 2 by a driving unit (not shown). With this movement, the yoke 19 and the magnet 7 attached to the yoke 19 move. Therefore, the focusing coil 4 and the magnet 7
And the relative position in the tracking direction changes.

When the holder 9 reaches a position where the displacement ΔL shown in FIG. 8 disappears, the objective lens 2 does not tilt in the disk radial direction. Here, the base 47 of the jig 15
The adjustment movement in the direction of arrow B is stopped. Next, a current is applied to the tracking coil 5 to continuously operate the movable portion 12 in the tracking direction. That is, the movable portion 12 is vibrated at a very low frequency in the direction of arrow B, that is, in the radial direction of the disk.

If there is a shift ΔL between the tracking coil 5 and the magnet 7 in the direction of the arrow A in FIG. 8, the objective lens 2 tilts in the radial direction of the disk. The base 47 of the jig 15 is moved in the direction of arrow A in FIG. 2 by a driving means (not shown) to change the relative position of the tracking coil 5 and the magnet 7 in the direction of arrow A, as shown in FIG. When the deviation ΔL disappears, the objective lens 2 does not tilt in the disk radial direction. Here, the adjustment movement of the base 47 of the jig 15 in the direction of the arrow A is stopped. In this state, an adhesive is applied to a gap between the yoke 19 and the base 48, and the yoke 19 is fixed to the base 48. Subsequently, the yoke 6 of the objective lens driving device 1 is fixed to a predetermined position of a pickup case (carriage) in a disc device (not shown).

In the above steps, first, a current is applied to the focusing coil 4 so that the base 47 of the jig 15
To adjust the relative position of the focusing coil 4 and the magnet 7 in the tracking direction, and then apply a current to the tracking coil 5 and at the same time
7 was moved in the direction of arrow A to adjust the relative position of the tracking coil 5 and the magnet 7 in the direction of arrow B. But,
There is no problem if this order is reversed.

In the process according to the present embodiment, before the yoke 19 is completely held by the jig 15, there is a jig (not shown) for holding the yoke 19 at the position shown in FIG.
After the yoke 19 is completely chucked, the holding of the yoke 19 by the jig (not shown) is released, but the yoke 19 is attached to the jig 15 from the beginning without holding the yoke 19 by the jig (not shown). May be held at the position shown in FIG.

In the present embodiment, the yoke 19 is fixed to the base 48 with an adhesive, but the yoke 19 may be directly bonded to an optical pickup case (carriage) (not shown). At this time, the holder 9 supporting the movable portion 12 may be directly fixed to an optical pickup case (not shown).

Further, in the present embodiment, the relative position of the tracking coil 5 and the magnet 7 in the focusing direction is optimized when the objective lens driving device 1 is placed horizontally. Has been optimized for the tracking coil 5 at the position where its own weight has settled. When the objective lens driving device 1 is placed vertically, it is necessary to optimize the tracking coil 5 at a position where the movable portion 12 does not sink under its own weight. If both horizontal and vertical directions are possible, it is needless to say that the adjustment must be made so as to obtain an intermediate characteristic between the two optimal states.

Further, in the present embodiment, the magnet 7 is attached to the yoke 19 and the position of the yoke 19 is adjusted, but the yoke 19 is fixed to the base 48 from the beginning or
9 is formed integrally with the base 48, and the same effect as that of adjusting the position of only the magnet 7 is obtained.

According to the present embodiment, since the holder and the movable part supported by the holder are fixed to the base and the position on the magnetic circuit side is adjusted, the position of the objective lens mounted on the movable part can be adjusted optically. Even if the assembling accuracy of each part and the dimensional accuracy of the parts are relaxed without deviation from the system, the inclination of the objective lens 2 in the disk radial direction can be greatly reduced.

Next, the third embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described.

FIG. 10 is an exploded perspective view showing an objective lens driving device 1 according to a third embodiment of the present invention. However, the wires and the movable parts supported by the wires are omitted.

Reference numeral 26 denotes a connecting plate which holds the holder 9 and is mounted on the mounting portion 44 of the yoke 6. 33 is a projection of the connection plate 26, and 31 is a rising portion of the connection plate 26. Reference numeral 32 denotes a slot for guiding provided in the rising portion 31. The connecting plate 26 serves as the mounting portion 44 of the yoke 6.
The projection 33 implanted on the connecting plate 26 is fitted into the guide notch 34 provided on the mounting portion 44 of the yoke 6. Also, the connecting plate 26
Of the holder 9 abuts on a step surface 29 provided on the mounting surface of the holder 9 on the substrate 10. At this time, the projection 30 provided around the hole for penetrating the wire 8 of the holder 9 fits into the elongated hole 32 for guiding provided in the rising portion 31 of the connection plate 26. From there, the substrate 10 is attached to the holder 9.
The projection 30 of the holder 9 is located at a position corresponding to the hole 41 for penetrating the wire 8 of the substrate 10. The rising portion 31 of the connection plate 26 is sandwiched between the step surface 29 of the holder 9 and the substrate 10. 27 is a screw used for adjusting the position of the holder 9 described later. The screw 27 is assembled in a state where it is screwed into the screw hole 35 of the holder 9 in advance. Screw head 42
Is located at a position corresponding to the hole 36 of the connection plate 26, but the diameter of the screw head 42 is larger than the diameter of the hole 36. 28
Is a spring that urges the holder 9 in a direction of pressing the holder 9 against the mounting portion 44 of the yoke 6.

FIG. 11 is a perspective view showing a state in which the objective lens driving device 1 of the present embodiment is assembled. Spring 28
Is inserted through a spring insertion hole 39 of the substrate 10 and a spring insertion hole 40 of the holder 9. Also,
The surface 51 of the spring 28 abuts on the mounting surface 44 of the yoke 6 shown in FIG. The holder 9 is pressed against the connection plate 26 by the urging force of the spring 28, and the connection plate 26 holding the holder 9 is pressed against the mounting surface 44 of the yoke 6. Also, the holes 3 in the connection plate 26 shown in FIG.
6, the hole 38 of the yoke 6 and the hole 37 of the spring 28
Since they are located at the same position in the state of 1, the notch for inserting the driver tip cut into the screw head 42 of the screw 27 can be seen from below the objective lens driving device 1 through these holes.

FIGS. 12 and 13 are plan views showing the objective lens driving device 1 of the present embodiment shown in FIG. The wire 8 and the movable part 12
It is omitted as in FIG. The spring 37 is also omitted. Projection 33 of connection plate 26 holding holder 9
Are fitted in the notches 34 provided in the mounting portion 44 of the yoke 6. FIG. 12 shows that the projection 33 is located substantially at the center of the notch 34. The connection plate 26 includes a projection 33
Can be moved in the direction of arrow B in FIG. Along with this, the holder 9 held by the connecting plate also moves in the direction of arrow B in FIG.

FIG. 13 shows a state in which the connecting plate 26 has moved most to the left in FIG. Of the two projections 33,
Since the right protrusion is in contact with the arc surface of the right cutout 34, the connection plate 26 cannot move further to the left in FIG. Since the hole 38 of the yoke 6 is an elongated hole, even if the connecting plate 26 moves in the direction of arrow B as shown in FIG.
The groove into which the tip of the cut driver enters can be seen from the direction shown in FIG.

In this state, while monitoring the inclination of the objective lens 2 with an autocollimator or the like, a current is applied to the focusing coil 4 to move the movable portion 12 (not shown in FIGS. 12 and 13) in a direction perpendicular to the disk. Is operated continuously.
That is, the movable part 12 is vibrated at a very low frequency in a direction perpendicular to the disk. As shown in FIG. 8, when the focusing coil 4 and the magnet 7 are displaced from each other by a certain distance ΔL in the radial direction of the disk, it is monitored that the objective lens 2 is tilted in the radial direction of the disk. From this state, the holder 9 or the connection plate 26 is pushed and moved in the direction of arrow B in FIG. 12 by a jig (not shown). With this movement, the holder 9 and the movable portion 12 supported by the holder 9 by the wire 8 not shown in FIGS. Therefore, the relative position of the focusing coil 4 and the magnet 7 in the disk radial direction changes. Then, when the holder 9 reaches a position where the displacement ΔL shown in FIG. 8 disappears, the objective lens 2 does not tilt in the disk radial direction. Here, the adjustment movement of the base 47 of the jig 15 in the direction of the arrow B is stopped.

FIGS. 14 and 15 are rear side views showing the objective lens driving device 1 of the present embodiment shown in FIG. The wire 8 and the movable part 12 are shown in FIG.
It is abbreviated as in. The spring 37 is also omitted. The protrusion 30 provided on the holder 9 fits into a long hole 32 provided on the rising portion 31 of the connection plate 26. FIG.
The projection 30 is located substantially at the bottom of the elongated hole 32. From here, when the screw 27 is rotated by a driver (not shown) in a direction to come out of the screw hole 35 of the holder 9, the screw 2
Since the screw head 42 of FIG. 7 is pressed against the surface near the hole 36 of the connection plate 26 as shown in FIG. 10, the holder 9 moves in the direction of arrow A in FIG. Receive strength. And the holder 9 is provided with the projection 30
Is guided to the elongated hole 32, so that the yoke 6 is moved against the yoke 6 against the urging force of the spring 28 (not shown in FIG. 14).
In the direction of arrow A.

FIG. 15 shows a state in which the holder 9 has been moved most upward in FIG. Of the four projections 33, the upper two
Since the three projections are in contact with the upper arc surface of the elongated hole 32, the holder 9 cannot move upward in FIG. As described above, since the holder 9 is movable with respect to the yoke 6 in the direction of the arrow A in FIG. 14, the movable portion 12 supported by the holder 9 is attached to the magnet 7 attached to the yoke 6. On the other hand, the movement can be adjusted in the direction of arrow A in FIG.

A current is applied to the tracking coil 5 to move the movable portion 12 continuously in the disk radial direction. That is, the movable section 12 is vibrated at a very low frequency in the radial direction of the disk. If there is a shift ΔL in the focus direction (direction of arrow A) between the tracking coil 5 and the magnet 7 in FIG.
The objective lens 2 is inclined in the disk radial direction. Screw 27
Is rotated by a driver (not shown),
When the holder 9 is moved in the direction of arrow A in FIG. 14 to change the relative position of the tracking coil 5 and the magnet 7 in the direction perpendicular to the disk, and when the displacement ΔL shown in FIG.
The objective lens 2 does not tilt in the radial direction of the disk. Here, the adjustment movement of the base 47 of the jig 15 in the direction of the arrow A is stopped. In this state, an adhesive 18 is applied to a gap between the holder 9 and the side surface rising portion 13 of the yoke 6, and the holder 9 is fixed to the yoke 6.

In the process of this embodiment, first, a current is applied to the focusing coil 4 to
Is moved in the direction of arrow B to adjust the relative position of the focusing coil 4 and the magnet 7 in the tracking direction. Then, a current is applied to the tracking coil 5 and the jig 15 is moved.
Is moved in the direction of arrow A to adjust the relative position of the tracking coil 5 and the magnet 7 in the focusing direction. However, there is no problem if this order is reversed.

In the above steps, first, a current is applied to the focusing coil 4 so that the base 47 of the jig 15
To adjust the relative position of the focusing coil 4 and the magnet 7 in the tracking direction, and then apply a current to the tracking coil 5 and at the same time
7 was moved in the direction of arrow A to adjust the relative position of the tracking coil 5 and the magnet 7 in the focusing direction.
However, there is no problem if this order is reversed.

In this embodiment, the connecting plate 2
Although the position of the connecting plate 26 has been adjusted by placing it on the yoke 6, the connecting plate 26 may be placed directly on a case (carriage) of an optical pickup (not shown). At this time, the magnetic circuit portion of the yoke 6 to which the magnet 7 is attached may be directly fixed to an optical pickup case (not shown).

In this embodiment, the relative position of the tracking coil 5 and the magnet 7 in the direction perpendicular to the disk is optimized when the objective lens driving device 1 is placed horizontally. This means that the tracking coil 5 at the position where the movable portion 12 has settled under its own weight has been optimized. When the objective lens driving device 1 is placed vertically in the disk device, the tracking coil 5 at a position where the movable portion 12 does not sink under its own weight must be optimized. If both horizontal and vertical directions are possible, it is needless to say that the adjustment must be made so as to obtain an intermediate characteristic between the two optimal states.

According to the present embodiment, the inclination of the objective lens 2 in the radial direction of the disk can be reduced without requiring a special adjusting jig and reducing the assembly accuracy of each component and the dimensional accuracy of the components. It can be greatly reduced.

[0089]

As described above, according to the present invention, the inclination of the objective lens 2 in the radial direction of the disc can be greatly reduced even in the objective lens driving device, even if the assembly accuracy of each component and the dimensional accuracy of the components are relaxed. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an objective lens driving device and a method of assembling the same according to the present invention.

FIG. 2 is a perspective view showing a first embodiment of an objective lens driving device and an assembling method of the present invention.

FIG. 3 is an exploded perspective view showing a first embodiment of the objective lens driving device of the present invention.

FIG. 4 is a plan view showing a first embodiment of the objective lens driving device of the present invention.

FIG. 5 is a side sectional view showing a first embodiment of the objective lens driving device of the present invention.

FIG. 6 is an exploded perspective view showing a second embodiment of the objective lens driving device of the present invention.

FIG. 7 is a perspective view showing a second embodiment of the objective lens driving device and the method of assembling the same according to the present invention.

FIG. 8 is a schematic diagram illustrating an operation principle of lens tilt due to a displacement between a focusing coil and a magnet.

FIG. 9 is a schematic diagram showing an operation principle of lens tilt due to a positional shift between a tracking coil and a magnet.

FIG. 10 is an exploded perspective view showing a third embodiment of the objective lens driving device according to the present invention.

FIG. 11 is a perspective view showing a third embodiment of the objective lens driving device of the present invention.

FIG. 12 is a plan view showing a third embodiment of the objective lens driving device of the present invention.

FIG. 13 is a plan view showing a third embodiment of the objective lens driving device of the present invention.

FIG. 14 is a rear side view showing a third embodiment of the objective lens driving device of the present invention.

FIG. 15 is a rear side view showing a third embodiment of the objective lens driving device of the present invention.

[Explanation of symbols]

1. Objective lens driving device 2. Objective lens 3.
Bobbin, 4 Focusing coil, 5 Tracking coil, 6 Yoke, 7 Magnet, 8
Wire, 9 Holder, 10 Fixed substrate, 12 Movable part, 15 Jig, 16 Shaft, 18 Adhesive, 19 Yoke, 26 Connection plate, 27
Screw 37 37 Spring 48 Base.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinya Fujimori 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Nobuyuki Maeda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Address Digital Media Development Division, Hitachi, Ltd. (72) Inventor Michio Miura 1 Kitano, Majo, Mizusawa-shi, Iwate Inside Hitachi Media Electronics Co., Ltd. (72) Inventor Akio Yabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken Address: Hitachi Image Information System Co., Ltd.

Claims (15)

[Claims] 1. An objective lens for recording or reproducing information on or from a disc, a bobbin holding the objective lens, a focusing coil generating a force for driving the bobbin in a focusing direction, and the bobbin in a tracking direction. A tracking coil for generating a driving force for driving the focusing coil, a magnetic circuit for generating a magnetic flux acting on the tracking coil, an elastic support member for supporting the bobbin at one end, and supporting the other end of the elastic support member. The bobbin and the holder have a movement range in which a relative position with respect to the magnetic circuit can be moved in a disk radial direction and / or in a direction perpendicular to the disk. The position relative to the magnetic circuit in the disk radial direction and / or perpendicular to the disk An objective lens driving device characterized in that it is positioned and fixed after being adjusted in the direction. 2. The objective lens driving device according to claim 1, further comprising a base having the magnetic circuit, and moving means for moving the holder in a radial direction of the disk and / or in a direction perpendicular to the disk. The relative position with respect to the magnetic circuit of the base is adjusted by moving the moving means in the radial direction of the disk and / or in the direction perpendicular to the disk, and then the positioning is fixed to the base. The objective lens driving device according to claim 1, wherein 3. The magnetic circuit has a movement range in which a relative position with respect to the holder can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the magnetic circuit has a relative position with respect to the holder. 2. The objective lens driving device according to claim 1, wherein the positioning is fixed after the position is adjusted in a disk radial direction and / or a direction perpendicular to the disk. 4. The objective lens driving device has a base for fixedly supporting the holder, and moving means for moving the magnetic circuit in a disk radial direction and / or in a direction perpendicular to the disk. The magnetic circuit is positioned and fixed to the base after being adjusted by moving the relative position with respect to the holder fixedly supported by the base in the disk radial direction and / or the direction perpendicular to the disk by the moving means. The objective lens driving device according to claim 3, wherein the driving is performed. 5. The holder has a movement range in which a relative position with respect to the magnetic circuit can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the holder has a relative position with respect to the magnetic circuit. 2. The method of assembling an objective lens driving device according to claim 1, wherein the positioning is fixed after the position is adjusted in a radial direction of the disk and / or in a direction perpendicular to the disk. 6. The objective lens driving device has a base having the magnetic circuit, and moving means for moving the holder in a disk radial direction and / or in a direction perpendicular to the disk. The relative position of the base with the magnetic circuit is adjusted by moving the moving means in the radial direction of the disk and / or in the direction perpendicular to the disk, and then the positioning is fixed to the base. The method of assembling the objective lens driving device according to claim 5. 7. The magnetic circuit has a moving range in which a relative position with respect to the holder can be moved in a disk radial direction and / or a direction perpendicular to the disk, and the magnetic circuit has a relative position with respect to the holder. 7. The method for assembling an objective lens driving device according to claim 6, wherein the positioning is fixed after the position is adjusted in a disk radial direction and / or a direction perpendicular to the disk. 8. The objective lens driving device has a base for fixedly supporting the holder, and moving means for moving the holder in a disk radial direction and / or in a direction perpendicular to the disk. The circuit is positioned and fixed to the base after being adjusted by moving the relative position with respect to the holder fixedly supported by the base in the disk radial direction and / or the direction perpendicular to the disk by the moving means. The method for assembling an objective lens driving device according to claim 7, wherein 9. The objective lens driving device has a connecting member mounted on a base having the magnetic circuit and holding the holder, and the connecting member has a surface mounted on the base. Has at least one projection, and the base is:
The connecting member mounting surface has a fitting shape having a linear shape that fits with the protrusion and extends in the disk radial direction, and the connecting member is configured such that the protrusion moves along the linear shape of the fitting shape. 3. The objective lens driving device according to claim 1, wherein the objective lens driving device is movable in a disk radial direction while holding the holder. 10. The objective lens driving device has a connecting member mounted on a base having the magnetic circuit and holding the holder, wherein the base has at least one connecting surface on the connecting member mounting surface. Having the number of protrusions, and the connecting member,
The surface mounted on the base has a fitting shape having a linear shape that fits with the protrusion and extends in the disk radial direction, and the connecting member moves along the linear shape of the fitting shape. 3. The objective lens driving device according to claim 1, wherein the objective lens driving device is movable in a disk radial direction while holding the holder. 11. The connecting member has a rising portion in a direction perpendicular to the disk. The rising portion of the connecting member contacts and holds the holder, and the holding member of the rising portion of the connecting member holds the holder. A fitting shape having at least one protrusion on a mounting surface to be held, and the holder having a linear shape extending in a direction perpendicular to the disk while being fitted with the protrusion on a surface contacting a rising portion of the connecting member. 11. The device according to claim 1, wherein the holder is movable in a direction perpendicular to the disk by moving the protrusion along the linear shape of the fitting shape. The objective lens driving device according to claim 1. 12. The connecting member has a rising portion in a direction perpendicular to the disk. The rising portion of the connecting member contacts and holds the holder, and the holder is provided with a rising portion of the connecting member. The connecting member has a linear shape that fits with the protrusion and extends in a direction perpendicular to the disk on a mounting surface of the rising portion that holds the holder. 10. The holder according to claim 1, wherein said holder has a fitting shape, and said holder is movable in a direction perpendicular to a disk by moving said projection along a linear shape of said fitting shape.
11. The objective lens driving device according to any one of items 10. 13. The holder according to claim 1, wherein the holder has at least one screw hole for disposing a screw capable of adjusting the movement of the holder in a direction perpendicular to the disk.
The objective lens driving device according to any one of 2, 9, 10, 11, and 12. 14. The objective lens driving device according to claim 1, further comprising a spring for urging the holder and the connecting member in a direction of pressing the connecting member on the connecting member mounting surface of the base. The objective lens driving device according to any one of 9, 10, 11, 12, and 13. 15. The objective lens driving device according to claim 1, wherein the connecting member is moved and adjusted in the radial direction of the disk on the connecting member mounting surface of the base, and is positioned and fixed, and the holder is mounted on the holder mounting surface of the connecting member. 3. The method for assembling an objective lens driving device according to claim 1, wherein the positioning and fixing are performed after the movement and adjustment are performed in a direction perpendicular to the disk.