JPH08297847A - Inclination adjusting mechanism and inclination adjusting method for objective lens driving device - Google Patents

Abstract

PURPOSE: To form a part as the fulcurum of the inclining operation of an objective lens driving device with a simple work without necessitating the exclusive components for forming the fulcurum for inclination adjustments, to make the movement at the time of the inclination adjustments smooth, to make inclination adjustments in two directions easy and to easily perform the assembling of the device. CONSTITUTION: The fixing base 7 of the objective lens driving device is made to be such a constitution that bottom end parts of yoke parts 7a, 7b are separated from the fixing base 7 by sheet metal works and protrude from the rear side of a bottom plate part 71 to form the fulcurum of the inclination adjustments. Then, a leaf spring 20 imparting the fixing base 7 to the side of a housing 17 is arranged in between the vertical part 7c of the fixing part 7 and the back face substrate 11 of a movable part to be attached to the vertical part 7c together with the back face substrate 11 by a fixing screw 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt adjusting mechanism and a tilt adjusting method for an objective lens driving device, and more particularly to optically recording, reproducing or erasing information by irradiating a recording medium with a light beam. The present invention relates to a tilt adjusting mechanism of an objective lens driving device in an optical information recording / reproducing device such as a magneto-optical disc recording / reproducing device.

[0002]

2. Description of the Related Art Conventionally, as an objective lens driving device as described above, an objective lens for converging a light beam and irradiating the converged light on an information recording medium such as a magneto-optical disk is provided with a focusing direction and a tracking direction. There is a two-axis drive objective lens drive device that controls movement. In this device, when the light beam does not enter the information recording medium perpendicularly, aberration occurs and it becomes impossible to focus light in a predetermined spot shape. Therefore, it is necessary to adjust the inclination of the objective lens.

Therefore, a mechanism for adjusting the inclination of such an objective lens driving device with respect to the reference plane has already been considered.

(First Conventional Example) FIG. 21 is an exploded perspective view showing a tilt adjusting mechanism of a conventional objective lens driving device.
In the figure, 101 is an objective lens driving device, which is an objective lens 10
2 and a lens holder 10 for accommodating the objective lens 102.
3 and the lens holder 103 is supported by a leaf spring 104 so as to be movable in the focusing direction, and the leaf spring 104 is fixed to an adjusting plate 105 for adjusting the inclination. Further, the adjusting plate 105 is
A sphere 106 made of, for example, a metal, which is arranged on the base 108.
Is supported at one point by and is urged toward the base 108 side by the pressing metal fitting 107. This press fitting 107
Is fixed to the base 108 with a mounting screw 109,
Further, the base 108 is provided with a locking pin 110 for positioning the adjusting plate 105 with respect to the base 108.

Here, the adjusting plate 105 is the base 10
The lens holder 103 is fitted with a focusing coil, and the base 108 is attached to the lens holder 103 by two adjusting screws 111 which partially penetrate 8 and are screwed into the adjusting plate 105. , Member 1 constituting a magnetic circuit
13 is attached.

In the tilt adjusting mechanism of the objective lens driving device, the holding metal fitting 107 is fixed so as to give a downward elastic force to the adjusting plate 105 at a position different from the support point of the spherical body 106. Therefore, the sphere 1
When the adjustment screw located on the side opposite to this power point is tightened across 06, the adjustment plate 105 receives a downward force. That is, in this adjusting mechanism, the adjusting plate 105 is supported in a seesaw state with the support point of the spherical body 106 as a fulcrum, and the two adjusting screws 111 are independently rotated to adjust the tilt in two directions. It can be carried out.

(Second conventional example) Also, the actual Kaihei 5-505.
No. 23, the objective lens driving device is a carriage base (base) as an inclination adjusting mechanism of the objective lens driving device.
Another example of the mechanism arranged to be tiltable upward is disclosed. In the mechanism described in this publication, the head base that constitutes the objective lens driving device is supported on the conical tip of the support screw that projects from the upper surface of the carriage base (base). A first adjusting screw is screwed into the carriage base so as to pass through the head base.
The head base is urged downward, that is, toward the carriage base by a coil spring coaxial with the adjusting screw. Further, a second adjusting screw is screwed into the carriage base so as to penetrate the head base, and a third adjusting screw is screwed into the head base, and a tip of the third adjusting screw is screwed into the carriage base. It is designed to hold down the top surface of the base.

In the tilt adjusting mechanism of the objective lens driving device having such a structure, tilt adjustment in two directions can be performed by the support screw and the third adjusting screw.

(Third conventional example) Further, Japanese Patent Laid-Open No. 5-334.
Japanese Patent No. 684 discloses a mechanism for tiltably supporting a biaxial actuator part incorporating an objective lens in an optical pickup in an optical pickup.

In the support mechanism described in this publication, the biaxial actuator portion has a skew base in which a plate-like member is bent in a U-shape in cross section, and a tip of a side plate is formed in an arc shape, and the arc-shaped side plate of the skew base. It is slidably supported on the optical pickup base along the tip of the, and one end of the skew base is pressed against the optical pick-up base side by a leaf spring, and the tilt is adjusted by the screw attached to the other end side of the skew base. To be able to do.

(Fourth Conventional Example) FIG. 22 and FIG.
Shows a mechanism already developed by the inventors of the present invention as another tilt adjusting mechanism for an objective lens driving device. 22 is a perspective view showing a tilt adjusting mechanism of the objective lens driving device, and FIG. 23 is a view showing a structure of a cross section taken along line XXIII-XXIII of FIG.

In the figure, 201 is an objective lens driving device,
The housing 212 is composed of a fixed portion that is positionally adjustable and a movable portion that is supported so as to be movable in a predetermined direction with respect to the fixed portion. The movable portion has an objective lens 202 and a lens holder 203 that houses the objective lens 202, and the lens holder 203 is movably supported in two directions by elastic bodies 204a to 204d. Each of the elastic bodies 204a to 204d
The damper material 205a-2 for suppressing the resonance.
05d is attached.

The fixing portion includes a base plate 211,
A fixing member 206a arranged on the base plate 211,
An inverted U-shaped portion 208 provided on the base 211, and the yoke portions 2 facing each other of the inverted U-shaped portion 208.
06b and 206c have permanent magnets 207a and 2c, respectively.
07b is adhered. In addition, the lens holder 2
A focusing coil 209 and tracking coils 210a and 210b are attached to a part of 03.

Here, the yoke portions 206b and 206 are
c and the permanent magnets 207a and 207b form a magnetic circuit, and the base plate 21 is provided on the open end side of the magnetic circuit.
1 is located. In addition, the tip portion 2 of the yoke portion 206c
06d protrudes from the back surface of the base 211 and serves as a fulcrum for the housing 212.

Further, in this mechanism, an elastic force is applied to the point A in FIG. 23, that is, the point located right above the tip portion 206d of the yoke portion 206c so that the fulcrum portion does not float, and the adjusting leaf spring is 213 gives the base plate 211 an upward elastic force with respect to the housing 212. Further, two tilt adjusting screws 214a and 214b penetrating the housing 212 are screwed into the base plate 211, and the tilt of the objective lens driving device can be adjusted by the tilt adjusting screws. .

[0016]

However, in the first conventional example, since a sphere is used as the fulcrum for tilt adjustment, such a sphere is very small as a component, and the handling is troublesome, and the assembling work is difficult. You may lose it,
There was a problem that it was attracted to the magnetic circuit.

In the second conventional example, the head base is supported by the tip of a support screw screwed to the carriage base, and the contact point between the support screw and the carriage base serves as a fulcrum for tilt adjustment. Therefore, in this case, a screw as a separate component for supporting the carriage base is required, and since the tip of the support screw is used as a fulcrum, the head base relative to the carriage base is adjusted by the amount of turning the support screw. There were problems such as the height changing.

Further, in the third conventional example, the skew base formed by processing the sheet metal is tilted with respect to the optical pickup base along the edge of the arcuate side portion. Therefore, the member that supports the skew base with respect to the optical pickup base can be formed of the same plate-shaped member as the skew base body, and a component for forming a fulcrum for tilt adjustment is required as a separate component of the skew base. It never happens.

However, in the mechanism in which the skew base is slid to adjust the inclination with respect to the optical pickup base as described above, since the two members rub against each other at the sliding portion of the skew base, it is difficult for the smooth movement. ,
Since the movable direction of the skew base is limited to one direction, there is a problem that only this mechanism can adjust tilt in one direction.

Further, in the fourth conventional example, the yoke 206 is used.
Since the inclination is adjusted with the tip of b and 206c as a fulcrum,
There is no need for a dedicated part for forming the fulcrum for tilt adjustment, and the tilt adjustment is not a sliding operation but a swinging operation with the lower end of the yoke 206c as a fulcrum, so the tilt adjustment Can be performed by a smooth movement.

However, since the open end of the magnetic circuit is located on the lower side, there is a problem that the positional relationship between the magnetic circuit and each coil is difficult to see during assembly, resulting in poor workability.

Further, a pressing spring for applying an urging force to the upper end (point A) of the yoke 206c whose lower end serves as a fulcrum for inclination adjustment, and an inclination adjustment for urging the base 211 to lift it with respect to the housing 212. Both of the springs 213 are necessary, and there is a problem that the number of parts increases.

Further, the inverted U-shaped portion 208 for mounting the magnet inside thereof has a shape corresponding to the outer shape of the magnet, so that when the magnet is adhered by an adhesive, an adhesive agent is used. There was a risk that it would stick out and contact the coil.

The present invention has been made in order to solve such a problem, does not require a dedicated part for forming a fulcrum for tilt adjustment, and has a smooth movement during tilt adjustment and can be operated in two directions. It is an object of the present invention to provide a tilt adjusting mechanism and a tilt adjusting method for an objective lens driving device, which can easily adjust the tilt of the objective lens driving device and can assemble the objective lens driving device with good workability.

[0025]

An inclination adjusting mechanism of an objective lens driving device according to the present invention (claim 1) fixes an objective lens for focusing a light beam and irradiating the converged light on a recording medium. And a mounting substrate for mounting the objective lens driving device, the position of the objective lens is changed by a magnetic force based on a control signal. And a support member that is in contact with the surface of the mounting substrate and supports the entire objective lens driving device so as to be tiltable with respect to the mounting substrate.

The fixed base constituting the fixed portion of the objective lens driving device is formed by processing a sheet metal, and the bottom plate portion is positioned along the surface of the mounting substrate and substantially parallel thereto, and the bottom plate portion. The yoke portion that is bent vertically is formed integrally with the yoke portion that constitutes the magnetic circuit. The yoke portion forms the supporting member, and the portion near the bent portion is the bottom plate. It has a structure in which it is separated from the bottom portion and protrudes from the back surface of the bottom plate portion, and the tip of the protrusion abuts the surface of the mounting substrate as a fulcrum of the tilting operation. Thereby, the above object is achieved.

According to a second aspect of the present invention, in the tilt adjusting mechanism of the objective lens driving device according to the first aspect, the protruding portion of the yoke portion has a structure in which the tip has an arc shape.

According to a third aspect of the present invention, in the tilt adjusting mechanism of the objective lens driving device according to the first aspect, the protruding portion of the yoke portion has a structure having a sharp tip.

In the tilt adjusting mechanism of the objective lens driving device according to the present invention (claim 4), the objective lens for converging the light beam and irradiating the converged light to the recording medium is set in a predetermined direction with respect to the fixed portion. A movable substrate is held, and the position of the objective lens is changed based on a control signal. The mounting substrate for mounting the objective lens driving device is in contact with the mounting substrate surface. And a support member that supports the entire objective lens driving device so as to be tiltable with respect to the mounting substrate.

The fixed base constituting the fixed portion of the objective lens driving device is formed by processing a sheet metal, and the bottom plate portion is located along the surface of the mounting substrate and substantially parallel thereto, and the bottom plate portion. And a yoke portion forming a magnetic circuit, which is bent so as to be vertical, is integrated with the bottom plate portion, which serves as the supporting member, and is formed by half punching. It has a structure in which the tip of the protruding portion protruding to the back surface contacts the surface of the mounting substrate as a fulcrum of the tilting operation. Thereby, the above object is achieved.

According to a fifth aspect of the present invention, in the tilt adjusting mechanism of the objective lens driving device according to the fourth aspect, the projecting portion formed by the half punch has a structure in which the outer surface forms a part of a substantially spherical surface. It was done.

According to a sixth aspect of the present invention, in the tilt adjusting mechanism of the objective lens driving device according to the fifth aspect, the protruding portion formed by the half punch is provided in the yoke portion.
A structure that is located in the vicinity of the portion where the magnets that form the magnetic circuit are arranged, and that the concave portion that is formed on the inner surface of the protruding portion serves as a clearance for the adhesive for bonding the magnet to the yoke portion. Is.

According to a seventh aspect of the present invention, in the tilt adjusting mechanism of the objective lens driving device according to the first or fourth aspect,
An urging unit that applies an urging force that urges the fixed base constituting the fixed portion of the objective lens driving device to the mounting substrate side, and an inclination of the objective lens driving device with respect to the mounting substrate. Tilting means for adjusting the biasing means at a position different from a portion of the surface of the mounting substrate where the protrusion abuts the mounting substrate, and applies the biasing force to the fixed base. A screw for adjusting the distance between the mounting substrate and the fixed base, the inclination adjusting means being provided in at least two positions in the region where the mounting substrate and the fixed base face each other. It is composed of members.

The tilt adjusting method of the objective lens driving device according to the present invention (claim 8) uses the tilt adjusting mechanism of the objective lens driving device according to claim 7 in two directions of the objective lens driving device with respect to the mounting substrate. Is a method of adjusting the inclination of.
In this method, the tilt in the two directions is adjusted by independently rotating the at least two screw members in a state in which the biasing force by the biasing means is applied to the fixed base.
The protrusion is used as a fulcrum.

In the tilt adjusting mechanism of the objective lens driving device according to the present invention (claim 9), the objective lens for focusing the light beam and irradiating the converged light on the recording medium is set in a predetermined direction with respect to the fixed portion. A movable substrate is held, and the position of the objective lens is changed by magnetic force based on a control signal. The mounting substrate for mounting the objective lens driving device and the surface of the mounting substrate are in contact with each other. And a supporting member for supporting the entire objective lens driving device so as to be tiltable with respect to the mounting substrate.

Further, the objective lens driving device has an elastic body for movably supporting the movable portion including the objective lens in a predetermined direction with respect to the fixed portion, and the end of the elastic body on the fixed portion side is fixed. It is connected to a support substrate that constitutes a fixed portion. The fixed base constituting the fixed portion of the objective lens driving device is formed by processing a metal plate so as to be perpendicular to the bottom plate portion located along the surface of the mounting substrate and substantially parallel to the bottom plate portion. The bent yoke portion that constitutes the magnetic circuit and the bent portion that is bent perpendicular to the bottom plate portion for fixing the support substrate are integrally formed.

An elastic member for applying an urging force for urging the fixed base to the mounting substrate side is fixed to the standing portion together with the support substrate by a fixing screw. Thereby, the above object is achieved.

In the tilt adjusting mechanism of the objective lens driving device according to the present invention (claim 10), the objective lens for focusing the light beam and irradiating the converged light on the recording medium is set in a predetermined direction with respect to the fixed portion. A movable substrate is held, and the position of the objective lens is changed by magnetic force based on a control signal. The mounting substrate for mounting the objective lens driving device and the surface of the mounting substrate are in contact with each other. And a supporting member for supporting the entire objective lens driving device so as to be tiltable with respect to the mounting substrate.

Further, the objective lens driving device has an elastic body for movably supporting the movable portion including the objective lens in a predetermined direction with respect to the fixed portion, and the end of the elastic body on the fixed portion side is fixed. It is connected to a support substrate that constitutes a fixed portion.

The fixed base constituting the objective lens driving device is formed by processing a metal plate so as to be perpendicular to the bottom plate portion which is located along the surface of the mounting substrate and substantially parallel to the bottom plate portion. The bent yoke portion that constitutes the magnetic circuit and the bent portion that is bent perpendicular to the bottom plate portion for fixing the support substrate are integrally formed.

An elastic member for applying an urging force for urging the fixed base to the mounting substrate side is fixed by being sandwiched between the supporting substrate and the upright portion. .

The present invention (claim 11) is based on the above claim 1.
In adjusting the tilt of the objective lens driving device of 0, a spacer is provided between the support substrate and the standing portion,
The spacer is molded so as to be integrated with the elastic member.

[0043]

According to the present invention (claim 1), the yoke portion constituting the fixed base of the objective lens driving device is separated from the bottom plate portion of the fixed base at a portion in the vicinity of the bent portion, and the yoke plate is formed from the back surface of the bottom plate portion. Also, since the tip of the protruding portion forms a fulcrum of the tilting operation of the objective lens driving device, the height of the objective lens driving device with respect to the mounting substrate, which is determined by the fulcrum, is adjusted when the tilt is adjusted. Never fluctuates. Further, since the projecting portion forming the fulcrum is a part of the yoke portion, a dedicated part for forming the fulcrum for adjusting the tilt is unnecessary.

Further, since the fixed base is formed by processing a sheet metal, the formation of the protruding portion at the lower end of the yoke can be easily realized.

Further, since the yoke portion constituting the magnetic circuit is bent so as to be perpendicular to the bottom plate portion, the open end of the magnetic circuit is located at the upper end of the fixed base, and at the time of assembly. The positional relationship between the magnetic circuit and each coil is easy to see and assembly is easy.

Further, the tilt adjustment is performed by swinging the fixed base with the protruding portion as a fulcrum, and the two members do not slide during tilting. Therefore, the objective lens is driven by a smooth movement. The tilt of the device in two directions can be adjusted. Further, since the fixed base is made of sheet metal, the yoke portion is thin, and therefore, the tilting is smoothly performed in a plane parallel to the thickness direction of the yoke portion.

In the present invention (claim 2), since the protruding portion at the lower end of the yoke portion has a structure in which the tip has an arcuate shape, the tilting of the yoke portion in a plane perpendicular to the thickness direction is also performed smoothly. be able to.

In the present invention (claim 3), since the protruding portion at the lower end of the yoke portion has a structure in which the tip thereof is sharp, the tilting can be freely performed in the plane perpendicular to the thickness direction of the yoke portion. be able to.

In the present invention (claim 4), the bottom plate portion of the fixed base which constitutes the fixed portion of the objective lens driving device has a protruding portion formed by a half punch and protruding to the rear surface side of the bottom plate portion, Since the tip of the protruding portion is in contact with the surface of the mounting substrate as a fulcrum of the tilting movement of the objective lens driving device, the height of the objective lens driving device with respect to the mounting substrate is determined by the fulcrum. It does not change when the tilt is adjusted. Further, since the projecting portion forming the fulcrum is a part of the yoke portion, a dedicated part for forming the fulcrum for adjusting the tilt is unnecessary. Further, the protruding portion can be easily formed by a simple processing method such as half punching. Further, like the invention of claim 1, since the open end of the magnetic circuit is located on the upper end side of the fixed base, the assembling is easy, and the tilting operation is not sliding of the two members, but the protruding Since it is performed by the swinging motion with the section as the fulcrum, the tilt adjustment in the two directions can be smoothly performed.

In the present invention (Claim 5), since the outer surface of the projection formed by the half punch forms a part of a substantially spherical surface, the fixed base is smoothly moved in any direction with respect to the housing. It can be supported so that it can be tilted.

In the present invention (claim 6), the protruding portion formed by the half punch is located in the vicinity of the portion of the yoke portion where the magnets constituting the magnetic circuit are arranged, and the protruding portion is Since the recess formed on the side surface serves as a clearance for the adhesive for adhering the magnet to the yoke, it is possible to prevent the adhesive from protruding when the magnet is adhered to the yoke with the adhesive. it can.

In the present invention (claim 7), the urging force for urging the fixed base toward the mounting substrate is applied at a position different from the fulcrum of swinging of the fixed base with respect to the mounting substrate. Therefore, it is possible to balance the supporting force of the fixed base in a seesaw state between the mounting position of the two screws that regulate the separation of the fixed base from the mounting substrate and the position where the biasing force is applied. The pressing spring for urging the fixed base toward the mounting substrate at the fulcrum position is unnecessary.

According to the present invention (claim 8), the fixed base is arranged on the mounting substrate such that the protrusion of the bottom surface thereof abuts the surface of the mounting substrate, and the fixed base is urged toward the mounting substrate. In addition, since the two bases regulate the separation of the fixed base from the mounting board in two directions, the two bases adjust the inclination of the fixed base in two directions with respect to the mounting board. Therefore, the objective lens driving device has a simple structure. Can be adjusted.

According to the present invention (claim 9), the elastic member for urging the fixed base toward the mounting substrate is mounted on the fixed base together with the supporting substrate for supporting the movable portion of the objective lens driving device. Since it is fixed by means of, the special screw for fixing the elastic member becomes unnecessary.

In the present invention (Claim 10), the elastic member for urging the fixed base toward the mounting substrate is bent and erected so as to stand upright with respect to the support substrate and the bottom portion of the fixed base. Since there is no metal member serving as an elastic member on the surface of the supporting substrate on which the elastic body supporting the movable part is attached, it is possible to prevent an electrical short circuit. You can

In the present invention (Claim 11), since the spacer is formed so as to be integrated with the elastic member, the number of parts can be reduced and the assembly is facilitated.

[0057]

Embodiments of the present invention will be described below.

(Embodiment 1) FIGS. 1 to 8 show a first embodiment of the present invention.
2 is a view for explaining an inclination adjusting mechanism of the objective lens driving device according to the embodiment of the present invention, FIG. 1 is a perspective view showing the overall configuration of the objective lens driving device, and FIG. FIG. 3 is a plan view showing a state in which the stopper is provided on the open end side of the magnetic circuit in the objective lens driving device shown in FIG. 2, and FIG. 2 is a cross-sectional view showing a structure taken along line IV-IV in FIG. 2, FIG. 5 is a plan view showing a shape of a housing, and FIG. FIG. 7 is a plan view shown in FIG.
7 is a sectional view showing the structure of the section taken along line VII-VII of FIG. 8, and FIG. 8 is an elevational view showing the shape of the yoke portion when one of the yoke portions is viewed from the direction of arrow R in FIG.

In FIG. 1, reference numeral 1 denotes an objective lens driving device of the present embodiment, in which a movable portion movably supported by a fixed portion converges a light beam and irradiates the converged light onto a recording medium. Objective lens 2, a lens holder 3 for holding the objective lens 2 at its tip, side substrates 4 attached to both side surfaces of the lens holder 3, and a central opening of the lens holder 3. And a focusing coil 5 and a tracking coil 6.

Elastic bodies 8 for movably supporting the lens holder 3 with respect to the fixed base 7 in the focusing direction and the tracking direction are arranged on the outer surface side of the side substrate 4, respectively.

One end 8a of the elastic body 8 is fixed to the side substrate 4 with solder 9, and the other end 8b of the elastic body 8 is fixed to the rear substrate 11 with solder 10. Elastic body 8
A damper material 8c that suppresses resonance of the elastic body 8 is fixed to a root portion near the end portion 8b.

As can be seen from FIGS. 6 and 7, the fixed base 7 which constitutes the fixed portion of the objective lens driving device 1 has yoke portions 7a and 7 of the substantially U-shaped portion 70 which face each other.
b and the standing portion 7c are in the optical axis direction, that is, the fixed base 7
It is formed by being bent in a direction perpendicular to the bottom surface portion 71 of the. The rear substrate 11 is fixed to the upright portion 7c with a fixing screw 13 via a spacer 12. On the other hand, permanent magnets 14a and 14b are fixed to the inner surfaces of the yoke portions 7a and 7b facing each other with an adhesive, respectively, and the yoke portions 7a and 7b and the permanent magnets 14a and 14b are fixed.
The magnetic circuit 15 is formed by 14b. The open end side of the magnetic circuit 15, that is, the yoke portions 7a and 7b
A stopper 16 is provided on the upper end side of the, so that the movable range of the movable portion in the focusing direction is limited.

A part of the focusing coil 5 and the tracking coil 6 is arranged in the magnetic gap 15a of the magnetic circuit 15, and the focusing coil 5 is wound so as to surround one permanent magnet 14a and the yoke portion 7a. The portion unnecessary for generating the driving force is arranged outside the magnetic gap 15a. The terminals of the focusing coil 5 and the tracking coil 6 are electrically connected to the rear substrate 11 via the side substrate 4 and the elastic body 8.

In the above-mentioned structure, by supplying a current to the focusing coil 5 and the tracking coil 6, the movable part can be driven independently in the focusing direction and the tracking direction.

Next, the tilt adjusting mechanism will be described. As can be seen from FIGS. 6 and 7, the lower end portion of the one yoke portion 7a bent in the optical axis direction is separated from the bottom surface portion 71 of the fixed base 7 so as to be located below the back surface of the bottom surface portion 71. It projects, and the projecting portion 7d has its tip 7d1.
Has an arc shape as shown in FIG.

The objective lens driving device 1 of this embodiment is shown in FIG.
It is mounted on the housing 17 having the structure shown in FIG.
Is in a state in which only the lower end (the tip of the protruding portion 7d) 7d1 of the yoke portion 7a is in contact with the housing 17 and the other portions are floating on the housing 17. That is, the fixed base 7 can be tilted about the lower end 7d1 of the yoke portion 7a as a fulcrum. Here, since the tip end 7d1 has an arc shape, the fixed base 7 can be easily tilted in the X direction, that is, in the plane perpendicular to the thickness direction of the yoke portion 7a, as shown in FIGS. Further, since the yoke portion 7a is a part of the fixed base formed by processing the sheet metal, the yoke portion 7a has a small thickness. Therefore, in the plane parallel to the Y direction of FIGS. 4 and 7, that is, the thickness direction of the yoke portion 7a. It is easy to lean on.

The fixed base 7 is formed with reference holes 7e and 7f for fitting the pins 17a and 17b protruding from the housing 17 to perform positioning, and
Screw holes 7g and 7h into which the tilt adjusting screws 18a and 18b are screwed are formed. The housing 17 has a hole 17 through which the tilt adjusting screws 18a and 18b pass.
c and 17d are formed, and a rising mirror 19 for deflecting a light beam from a light source (not shown) side is installed.

When the objective lens driving device 1 is mounted on the housing 17, the raising mirror 19 is located in the space directly below the objective lens 2, and the tilt adjusting mechanism as a whole can be made thin. A leaf spring (elastic means) is provided between the standing portion 7c of the fixed base 7 and the spacer 12.
20 is sandwiched, and is fixed to the standing portion 7c by the fixing screw 13 together with the rear substrate 11.

Here, the lower end of the leaf spring 20 is bent into a substantially L-shape, the bent portion is located in the opening 17c formed in the housing 17, and the tip 20a of the bent portion is It is in contact with the step portion 17e on the back surface of the housing 17. The leaf spring 20 applies a downward urging force to the fixed base 7, that is, toward the housing 17 side. Also, the tilt adjusting screws 18a, 1
When 8b is tightened, the base 7 also receives a downward force. Therefore, the moment of the force around the fulcrum (the lower end of the yoke portion 7a) due to the biasing force of the leaf spring 20 and the tightening force of the tilt adjusting screws 18a and 18b is balanced, and the fixed base 7 has its yoke portion 7a. Bottom edge 7
It will be supported in a seesaw state with d as a fulcrum.

FIG. 17 is a sectional view showing a process of fitting the leaf spring 20 into the step 17e of the housing 17. The tip portion of the leaf spring 20 is bent in the Y direction in the figure, and the step 17
Insert into e. In this case, if the lower end portion of the spacer 12 is chamfered 12a, the leaf spring 20 can be easily bent.

In such a structure, when the two tilt adjusting screws 18a and 18b are independently tightened or loosened, the fixed base 7 swings in two directions with respect to the housing 17, and the objective lens is driven. The tilt of the device can be adjusted.

As described above, according to the present embodiment, the yoke portions 7a, 7 constituting the fixed base 7 of the objective lens driving device 1 are formed.
Part b of the bent portion is separated from the bottom plate portion 71 of the fixed base 7 so as to project from the back surface of the bottom plate portion 71, and the tip 7d1 of the protruding portion 7d serves as a fulcrum of swinging of the fixed base 7. Since the structure is formed, the height of the fixed base 7, that is, the height of the objective lens driving device 1 with respect to the housing 17, which is determined by the fulcrum, does not change when tilt adjustment is performed. Further, since the protruding portion 7d forming the fulcrum is a part of the yoke portion 7a, there is no need for a dedicated component for forming the fulcrum for adjusting the inclination.

Further, since the fixed base 7 is formed by processing a sheet metal, the protruding portion 7d at the lower end of the yoke portion is formed.
Can be easily realized.

Further, the yoke portion 7a forming the magnetic circuit,
Since 7b is bent so as to be perpendicular to the bottom plate portion 71, the open end of the magnetic circuit 15 is fixed to the fixed base 7.
Since the magnetic circuit 15 and the coils 5 and 6 are located at the upper end of the coil, the positional relationship between the magnetic circuit 15 and the coils 5 and 6 can be easily seen and the assembly is easy.

Further, the inclination adjustment is performed by swinging the fixed base 7 with the protruding portion 7d as a fulcrum,
Since the two members do not slide during the tilting operation, the tilt of the objective lens driving device 1 in two directions can be adjusted by a smooth movement. Also, fixed base 7
Since it is made of sheet metal, the thickness of the yoke portion 7a is thin, and therefore, the tilting operation is smoothly performed in the plane parallel to the thickness direction of the yoke portion 7a.

(Embodiment 2) FIG. 9 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to a second embodiment of the present invention, in which the fixed base of this embodiment is viewed from the same direction as FIG. The shape of the yoke portion when the yoke portion is viewed is shown.

In this embodiment, the projecting portion 7d at the lower end of the yoke portion 7a in the tilt adjusting mechanism of the objective lens driving device of the first embodiment has a structure in which the tip 7d2 has a sharp shape. The configuration is the same as that of the first embodiment.

The second embodiment having such a structure also has the same effect as that of the first embodiment.

(Third Embodiment) FIG. 10 is a sectional view for explaining an inclination adjusting mechanism of an objective lens driving device according to a third embodiment of the present invention. The sectional structure of the first embodiment shown in FIG. The part corresponding to is shown.

In this embodiment, instead of the yoke portion 7a of the first embodiment, a yoke portion 7b of the fixed base 7 closer to the objective lens 2 is provided, and the lower portion thereof is lower than the bottom surface portion 71 of the fixed base 7. The structure is formed so as to project downward, and the projecting portion 7d
Has a structure in which its tip 7d1 has an arc shape. The other structure is the same as that of the first embodiment.

In this embodiment, the distance between the objective lens 2 and the tilt adjustment fulcrum 7d is shorter than that in the first embodiment, and the height change of the objective lens 2 due to tilt adjustment can be made small, but conversely. , The lower end 7d of the yoke portion 7b, which serves as the fulcrum of the swing of the fixed base 7, and the screws 18a, 1 for adjusting the inclination.
There is a difference from the first embodiment in that the distance from 8b in the Y direction is short, and the inclination largely changes with a slight rotation of the screw.

(Embodiment 4) FIG. 11 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to a fourth embodiment of the present invention, and has the sectional structure shown in FIG. 4 of the first embodiment. The cross-sectional structure of the back substrate and its vicinity is shown among the corresponding portions.

In this embodiment, the leaf spring 20 is fixed by being sandwiched between the spacer 12 and the rear substrate 11, and the lower end portion of the leaf spring 20 is in the opposite direction to that of the first embodiment.
That is, it is bent on the side opposite to the objective lens 2. The other structure is the same as that of the first embodiment.

The fourth embodiment having such a structure also has the same effect as that of the first embodiment.

(Embodiment 5) FIG. 12 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to a fifth embodiment of the present invention, and has the sectional structure shown in FIG. 11 of the fourth embodiment. The corresponding part is shown.

In this embodiment, the standing portion 7c of the fixed base is used.
The spacer 12 interposed between the rear substrate 11 and the rear substrate 11 is formed so as to be integrated with the leaf spring 20 that biases the fixed base 7 toward the housing. The other structure is similar to that of the first embodiment.

In the fifth embodiment having such a structure, since the spacer 12 is formed integrally with the leaf spring 20, the number of parts is reduced in addition to the effect of the first embodiment, and the assembly is improved. Has the effect that it is also easy.

(Embodiment 6) FIG. 13 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to a sixth embodiment of the present invention, and has the sectional structure shown in FIG. 11 of the fourth embodiment. The corresponding part is shown.

In this embodiment, the leaf spring 20 for urging the fixed base 7 toward the housing is superposed on the outer surface of the rear substrate 11 and fixed together with the rear substrate 11 to the standing portion 7c of the fixed base 7. ing. The other structure is the same as that of the fourth embodiment.

By the way, this embodiment also has the same effect as that of the first embodiment, but the elastic member 8 of the rear substrate 11 is used.
Since the leaf spring 20 is fixed to a portion to which one end 8b of the substrate is soldered, that is, a portion where the circuit pattern is formed, if the pattern of the rear substrate 11 is not sufficiently covered, the circuit pattern comes into contact with the leaf spring. There is a risk of short-circuiting, or even the leaf spring 20 may be soldered together when the elastic body 8 is soldered.

(Embodiment 7) FIGS. 14 to 16 are views for explaining an inclination adjusting mechanism of an objective lens driving device according to a seventh embodiment of the present invention. FIG. 14 is a plan view and FIG.
5 is a view showing a structure of a cross section taken along line XV-XV in FIG. 14, and FIG. 16 is a plan view showing a shape of a housing constituting the tilt adjusting mechanism.

In this embodiment, the housing 17 for mounting the objective lens driving device does not have a step 17e as shown in FIG. 5, but instead has a screw hole 17f for tightening the fixing screw 21. ing. The leaf spring 21 that biases the fixed base 7 toward the housing 17 is fastened and fixed to the screw hole 17f by using the fixing screw 21. The other structure is the same as that of the first embodiment.

In this embodiment having such a structure, the leaf spring 20 is fixed by disposing the leaf spring 20 on the screw hole 17f and mounting the fixing screw 21 in the screw hole 17f from above. Therefore, the workability of attaching the leaf spring 20 is good. However, since the fixing screw 21 is newly required, the number of parts increases. The other effects are the same as those of the first embodiment.

As described above, the fixing position of the leaf spring 20 may be the portion in the sixth embodiment or the seventh embodiment, but there are problems, and there are problems.
It is effective to dispose the leaf spring 20 between the substrate 11 and the upright portion 7c as in the third embodiment, the fourth embodiment, and the fifth embodiment.

Further, if the leaf spring 20 is integrally formed with the spacer inserted between the rear substrate 11 and the standing portion 7c, the number of parts can be further reduced and the assemblability can be effectively improved. By the way, the spacer 12 is inserted so as to attract the flexible printed circuit (not shown) extending from the rear substrate 11 and having its tip connected to the housing side so as not to float up.

As a method of fixing the leaf spring 20, a method of fixing with a special screw as in the seventh embodiment can be considered, but if the screw 13 for fixing the rear substrate 11 is used, the number of parts can be reduced. It is more effective in terms of reduction.

In the fourth to seventh embodiments, the fixing position and the fixing method of the leaf spring (elastic means) 20 are as follows.
The leaf spring mounting structure in the tilt adjusting mechanism of the objective lens driving device of the first embodiment has been described as a modified example, but the leaf spring mounting structure shown in the fourth to seventh embodiments is as follows.
It goes without saying that the invention can be applied to a mechanism other than the tilt adjusting mechanism of the objective lens driving device of the first embodiment.

(Embodiment 8) FIG. 18 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to an eighth embodiment of the present invention, and has the sectional structure shown in FIG. 4 of the first embodiment. The corresponding part is shown.

In this embodiment, the bottom portion 7 of the fixed base 7 is
A protruding portion 7i that protrudes toward the back surface of the bottom surface portion 71 is formed in the vicinity of the magnet mounting portion 1 by a half punch, and the tip of the protruding portion 7i is in contact with the surface of the housing 17. This allows the fixed base 7 to move to the housing 17
The inclination can be adjusted by using the contact point of the protruding portion 7i with the surface of the housing 17 as a fulcrum.
Since the size of the protruding portion 7i formed by the half punch is sufficiently small, the fixed base 7 can be easily tilted. The other structure is the same as that of the first embodiment. The eighth embodiment having such a configuration also has the same effect as the first embodiment.

(Embodiment 9) FIG. 19 is a view for explaining an inclination adjusting mechanism of an objective lens driving device according to a ninth embodiment of the present invention, and has the sectional structure shown in FIG. 4 of the first embodiment. The corresponding part is shown.

This embodiment differs from the eighth embodiment only in that the outer surface of the projection 7i on the rear surface side of the fixed base 7 formed by the half punch is substantially a spherical surface.

Further, in this embodiment, the protrusion is formed on the bottom surface of the fixed base 7 by a half punch using a member having a spherical surface, and the recess formed inside the protrusion is
When the permanent magnets 14a and 14b are bonded to the yoke portions 7a and 7b with an adhesive, they are used as a clearance for the adhesive.

In this embodiment, in addition to the effect of the eighth embodiment, the contact area between the projecting portion 7i and the housing 17 can be made as small as possible, and the tilting operation of the fixed base 7 with respect to the housing is smooth. It becomes possible to do it.

Further, the problem of protrusion of the adhesive for adhering the permanent magnets 14a and 14b to the yoke portions 7a and 7b can be solved.

That is, when the permanent magnets 14a and 14b are fixed to the inner surfaces of the yoke portions 7a and 7b, the adhesive applied to the interface is used.
When the adhesive is applied to the inner surface of b, and the permanent magnets 14a and 14b are slid down from the upper part of the yoke as shown in FIG. 20, the applied adhesive 22 is extruded. , Overhang. If this adhesive 22
However, if it sticks out to the side of the focusing coil 5 or the tracking coil 6, it may come into contact with these coils and limit the movable range.

On the other hand, when a half punch made of a member having a spherical surface is used as in this embodiment, the recess 7j formed on the inner side surface of the protrusion can be widely formed.
In addition, by accumulating the adhesive 22 that has squeezed out, the above problems can be prevented.

[0107]

As described above, according to the tilt adjusting mechanism of the objective lens driving device of the present invention (Claim 1), a part of the yoke portion near the bent portion is separated from the fixed base. Since the fulcrum of the swing motion of the fixed base is formed so as to protrude from the back surface of the bottom surface portion, the height of the objective lens driving device on the mounting substrate can be determined by the fulcrum. Further, there is no need for a dedicated part forming a fulcrum for tilt adjustment. Further, the protruding portion at the lower end of the yoke portion forming the fulcrum can be easily formed by bending the sheet metal. Also, since the yoke portion is a portion of the fixed base that faces the substantially U-shaped portion of the fixed base, the open end of the magnetic circuit is located above the fixed base, and the magnet is attached to the yoke portion. Assembly work is also easy.
Further, since the tilt adjustment of the objective lens driving device is performed not by the sliding motion but by the swinging motion about the protruding portion as a fulcrum, the tilt adjustment in two directions can be smoothly performed. Further, since the yoke portion is thin, it is possible to easily adjust the inclination in a plane parallel to the thickness direction.

Further, according to the present invention (claim 2), in the tilt adjusting mechanism of the objective lens driving device according to claim 1, the protruding portion at the lower end of the yoke portion has a structure in which the tip has an arc shape. It is also easy to adjust the inclination of the yoke portion in a plane perpendicular to the thickness direction.

Further, according to the invention (claim 3), according to the tilt adjusting mechanism of the objective lens driving device of claim 1, the protruding portion at the lower end of the yoke portion has a sharpened tip. Therefore, it is easy to adjust the inclination of the yoke portion in a plane perpendicular to the thickness direction.

According to the tilt adjusting mechanism of the objective lens driving device of the present invention (Claim 4), a portion of the bottom surface of the fixed base, which is located in the vicinity of the magnet mounting portion and protrudes from the back surface of the bottom surface by a half punch. Since the fixed base is oscillated with the protrusion as a fulcrum, the height of the objective lens driving device on the mounting substrate can be determined by the fulcrum. Further, there is no need for a dedicated part forming a fulcrum for tilt adjustment. Further, the protrusion forming the fulcrum can be easily formed by a half punch. Also, since the yoke portion is a portion of the fixed base that faces the substantially U-shaped portion of the fixed base, the open end of the magnetic circuit is located above the fixed base, and the magnet is attached to the yoke portion. Assembly work is also easy. Further, since the tilt adjustment of the objective lens driving device is performed not by the sliding motion but by the swinging motion about the protruding portion as a fulcrum, the tilt adjustment in two directions can be smoothly performed.

According to the present invention (Claim 5), in the tilt adjusting mechanism of the objective lens driving device according to Claim 4, the projection formed by the half punch is substantially a spherical surface. The fixed base can be supported so that it can be swung smoothly.

According to the invention (Claim 6), according to the tilt adjusting mechanism of the objective lens driving device of the above Claim 5, the recessed portion on the inner side of the projecting portion caused by the half punch is extra when the magnet is bonded. Since the adhesive has a clearance, it is possible to prevent the adhesive from protruding when the magnet is attached.

According to the present invention (Claim 7), in the tilt adjusting mechanism of the objective lens driving device according to Claim 1 or 4, the fixed base is provided at a position different from the protrusion serving as a fulcrum of swinging of the fixed base. Since the spring force for urging the mounting substrate side is applied, the tightening force of the two screws that regulate the separation between the fixed base and the mounting substrate is balanced with the urging force on both sides of the fulcrum. As a result, a spring for urging the fixed base toward the mounting substrate at the position of the fulcrum is not necessary.

According to the present invention (Claim 8), the tilt adjusting mechanism of the objective lens driving device is used, and the projection of the bottom surface of the bottom plate of the fixed base is used as a fulcrum to swing the objective lens. Supporting the device, of the fixed base,
With the spring force applied to one side of the fulcrum, the two screws adjust the tilt in two directions. Therefore, the tilt of the objective lens driving device can be adjusted with a simple configuration.

According to the tilt adjusting mechanism of the objective lens driving device of the present invention (Claim 9), the elastic member for urging the fixed base toward the mounting substrate is fixed to the substrate of the supporting substrate supporting the movable portion. Since it is fixed to the fixed base together with the supporting substrate with the use screw, a dedicated screw for fixing the elastic member becomes unnecessary.

According to the tilt adjusting mechanism of the objective lens driving device of the present invention (Claim 10), the elastic member for urging the fixed base toward the mounting substrate is fixed to the supporting substrate supporting the movable portion. Since it is arranged between the base and the standing portion, the surface of the support substrate on which the elastic body supporting the movable portion is attached urges the fixed base toward the mounting substrate. Since there is no elastic member made of, etc., an electrical short circuit on the support substrate can be prevented.

According to the present invention (Claim 11), in the tilt adjusting mechanism of the objective lens driving device, the spacer is formed so as to be integrated with the elastic member for urging the fixed base toward the mounting substrate. Therefore, the number of parts can be reduced and the assembly is easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of an objective lens driving device in an inclination adjusting mechanism of the objective lens driving device according to the first embodiment of the present invention.

FIG. 2 is a plan view showing a state in which the objective lens driving device is mounted on a housing.

FIG. 3 is a plan view showing a state in which a stopper provided on the open end side of a magnetic circuit mounted on the objective lens driving device on the housing is removed.

4 is a central cross-sectional side view showing the structure of a cross section taken along line IV-IV of FIG. 2. FIG.

FIG. 5 is a plan view showing the shape of the housing.

FIG. 6 is a plan view showing a shape of a fixed base which constitutes the tilt adjusting mechanism.

7 is a cross-sectional view showing the structure of a cross section taken along the line VII-VII of FIG.

8 is a front view showing the shape of a yoke portion of the fixed base shown in FIG.

FIG. 9 is a view for explaining the tilt adjusting mechanism of the objective lens driving device according to the second embodiment of the present invention, and is a front view showing the shape of the tip of the yoke portion constituting the tilt adjusting mechanism.

10 is a view for explaining an inclination adjusting mechanism of the objective lens driving device according to the third embodiment of the present invention, FIG.
FIG. 7 is a cross-sectional view of a portion corresponding to a cross section taken along the line VII, showing a protruding position of a lower end of a yoke portion that constitutes the tilt adjusting mechanism.

FIG. 11 is a cross-sectional view for explaining the tilt adjusting mechanism of the objective lens driving device according to the fourth embodiment of the present invention, and is a partial cross-sectional view showing a mounted state of a leaf spring which constitutes the tilt adjusting mechanism.

FIG. 12 is a sectional view for explaining a tilt adjusting mechanism of an objective lens driving device according to a fifth embodiment of the present invention, and is a partial cross sectional view showing a mounting state of a leaf spring which constitutes the tilt adjusting mechanism.

FIG. 13 is a cross-sectional view for explaining the tilt adjusting mechanism of the objective lens driving device according to the sixth embodiment of the present invention, and is a partial cross-sectional view showing a mounted state of a leaf spring which constitutes the tilt adjusting mechanism.

FIG. 14 is a plan view for explaining a tilt adjusting mechanism of an objective lens driving device according to a seventh embodiment of the present invention, showing a mounted state of a leaf spring which constitutes the tilt adjusting mechanism.

FIG. 15 is a cross-sectional view showing a structure of a cross section taken along line XV-XV of FIG.

FIG. 16 is a plan view showing the shape of a housing for mounting the objective lens driving device according to the seventh embodiment.

FIG. 17 is a partial cross-sectional view for explaining a process of fitting the leaf spring of the tilt adjusting mechanism of the first embodiment into the step of the housing.

FIG. 18 is a sectional view for explaining a tilt adjusting method for an objective lens driving device according to an eighth embodiment of the present invention, showing a structure of a portion serving as a fulcrum of the tilt adjusting mechanism.

FIG. 19 is a sectional view for explaining a tilt adjusting mechanism of an objective lens driving device according to a ninth embodiment of the present invention, in which the shape of a protrusion formed by a half punch is used as a fulcrum part of the tilt adjusting mechanism. Shows.

FIG. 20 is a cross-sectional view showing how a permanent magnet is attached to the yoke portion of the objective lens driving device in the ninth example.

FIG. 21 is an exploded perspective view showing a tilt adjusting mechanism (first conventional example) of a conventional objective lens driving device.

FIG. 22 is a perspective view showing another example (fourth conventional example) of the tilt adjusting mechanism of the conventional objective lens driving device.

23 is a central cross-sectional side view showing the structure of the cross section taken along the line XXIII-XXIII of FIG. 22.

[Explanation of symbols]

 1 Objective Lens Driving Device 2 Objective Lens 3 Lens Holder 4 Side Substrate 5 Focusing Coil 6 Tracking Coil 7 Fixed Base 7a, 7b Yoke 7i Projection 8 Elastic Body 11 Rear Substrate (Support Substrate) 12 Spacer 13 Fixing Screws 14a, 14b Permanent Magnet 16 Stopper 17 Housing (mounting board) 18a, 18b Screw for tilt adjustment 19 Standing mirror 20 Leaf spring (elastic means) 70 Almost U-shaped portion 71 Bottom plate portion

Claims (11)

[Claims] 1. An objective lens for converging a light beam and irradiating the converged light on a recording medium is held movably in a predetermined direction with respect to a fixed portion, and the position of the objective lens is changed based on a control signal. And a mounting substrate for mounting the objective lens driving device, and a surface of the mounting substrate abutting on the mounting substrate for mounting the entire objective lens driving device. A fixed base that includes a supporting member that tiltably supports the mounting substrate and that constitutes a fixing portion of the objective lens driving device is formed by sheet metal processing so as to be substantially parallel to the mounting substrate surface. The bottom plate portion located and the yoke portion forming a magnetic circuit, which is bent so as to be perpendicular to the bottom plate portion, are configured to be integrated, and the yoke portion forms the supporting member. Near the bend However, the objective lens driving device has a structure in which it is partly separated from the bottom plate portion and protrudes from the bottom surface of the bottom plate portion, and the tip of the protrusion abuts the surface of the mounting substrate as a fulcrum of the tilting operation. Tilt adjustment mechanism. 2. The tilt adjusting mechanism for an objective lens driving device according to claim 1, wherein a tip of the protruding portion of the yoke portion has an arc shape. 3. The tilt adjusting mechanism for an objective lens driving device according to claim 1, wherein a tip of the protruding portion of the yoke portion has a sharpened shape. 4. An objective lens for converging a light beam and irradiating the converged light onto a recording medium is held so as to be movable in a predetermined direction with respect to a fixed portion, and the position of the objective lens is changed based on a control signal. A tilt adjusting mechanism for an objective lens driving device that uses a magnet to mount a mounting substrate for mounting the objective lens driving device, and a surface of the mounting substrate that contacts the entire mounting surface of the objective lens driving device. The fixed base, which comprises a supporting member that tilts with respect to the mounting substrate, and which constitutes the fixing portion of the objective lens driving device, is substantially parallel to the mounting substrate along the surface of the mounting substrate by processing the sheet metal. The bottom plate portion located at and the yoke portion forming a magnetic circuit, which is bent so as to be perpendicular to the bottom plate portion, are integrally formed, and the bottom plate portion serves as the support member. Yes, by half punch Forming the tip of the protruding portion protruding bottom plate portion back surface side, the tilt adjusting mechanism of the objective lens driving device having a contacting structure on the surface of the placing 置基 plate as a fulcrum of the tilting motion. 5. The tilt adjusting mechanism for an objective lens driving device according to claim 4, wherein an outer surface of the protruding portion formed by the half punch forms a part of a substantially spherical surface. 6. The protrusion formed by the half punch is located in the vicinity of a portion of the yoke portion where a magnet forming a magnetic circuit is arranged, and a recess formed on an inner surface of the protrusion is formed. 6. The tilt adjusting mechanism for an objective lens driving device according to claim 5, wherein the tilt adjusting mechanism is an escape clearance for an adhesive agent for bonding the magnet to the yoke portion. 7. The tilt adjusting mechanism for an objective lens driving device according to claim 1, wherein the fixing base is biased toward a mounting substrate side with respect to a fixed base forming a fixing portion of the objective lens driving device. The biasing means includes a biasing means for applying a biasing force and a tilt adjusting means for adjusting a tilt of the objective lens driving device with respect to the mounting substrate, and the biasing means is provided in the surface of the mounting substrate for the protrusion. Is to apply the biasing force to the fixed base at a position different from the position where the mounting substrate contacts the mounting substrate, and the inclination adjusting means includes at least an area in which the mounting substrate and the fixed base face each other. An inclination adjusting mechanism for an objective lens driving device, which is provided at two positions and includes a screw member for adjusting a distance between the mounting substrate and the fixed base. 8. A method for adjusting the tilt of the objective lens driving device with respect to the mounting substrate in two directions by using the tilt adjusting mechanism of the objective lens driving device according to claim 7, wherein the biasing means is used. Inclination adjustment of the objective lens drive device in which the inclination in the two directions is adjusted by independently rotating the at least two screw members in a state in which a force is applied to the fixed base, with the protrusion as a fulcrum. Method. 9. An objective lens for converging a light beam and irradiating the converged light onto a recording medium is held movably in a predetermined direction with respect to a fixed portion, and the position of the objective lens is changed based on a control signal. And a mounting substrate for mounting the objective lens driving device, and a surface of the mounting substrate abutting on the mounting substrate for mounting the entire objective lens driving device. A supporting member that tiltably supports the mounting substrate, and the objective lens driving device includes an elastic body for movably supporting a movable portion including the objective lens in a predetermined direction with respect to the fixed portion. And a fixed portion side end of the elastic body is connected to a support substrate forming the fixed portion, and the fixed base forming the fixed portion is formed by processing a sheet metal.
A bottom plate portion that is located along the surface of the mounting substrate and substantially parallel thereto, a yoke portion that is bent so as to be perpendicular to the bottom plate portion, and constitutes a magnetic circuit, and a vertical portion that is perpendicular to the bottom plate portion. And a standing portion for fixing the supporting substrate, which is bent so that the supporting base is fixed to the supporting base, and an urging force for urging the fixing base toward the mounting substrate. An inclination adjusting mechanism of an objective lens driving device, wherein an elastic member to be applied is fixed to the upright portion together with the supporting substrate by a fixing screw. 10. An objective lens for converging a light beam and irradiating the converged light onto a recording medium is held movably in a predetermined direction with respect to a fixed portion, and the position of the objective lens is changed based on a control signal. And a mounting substrate for mounting the objective lens driving device, and a surface of the mounting substrate abutting on the mounting substrate for mounting the entire objective lens driving device. A supporting member that tiltably supports the mounting substrate, and the objective lens driving device includes an elastic body for movably supporting a movable portion including the objective lens in a predetermined direction with respect to the fixed portion. And a fixed portion side end of the elastic body is connected to a support substrate forming the fixed portion, and the fixed base forming the fixed portion is formed by processing a sheet metal.
A bottom plate portion that is located along the surface of the mounting substrate and substantially parallel thereto, a yoke portion that is bent so as to be perpendicular to the bottom plate portion, and constitutes a magnetic circuit, and a vertical portion that is perpendicular to the bottom plate portion. And a standing portion for fixing the supporting substrate, which is bent so that the supporting substrate is fixed to the supporting substrate, and an urging force for urging the fixing base toward the mounting substrate is applied to the fixing base. An inclination adjusting mechanism for an objective lens driving device, in which an elastic member is sandwiched and fixed between the supporting substrate and the upright portion. 11. The objective lens driving device according to claim 10, wherein a spacer is provided between the support substrate and the upright portion, and the spacer is molded so as to be integrated with the elastic member. Tilt adjustment mechanism.