JPH11149645A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the optical pickup device where a holder support member is adhered and fixed to a frame stably even when an objective lens driver is deeply imbeded into a container hole of the frame. SOLUTION: An objective lens driver 4 in the optical pickup device is completely imbeded in a container hole 24 for the objective lens driver 4 made to a frame 2. Since adhesive injection recessed parts 91-94 reaching a center position of a holder support member 57 in its thickness direction from an opening ridge 240 of the container hole 24 are formed with tapered faces 95-98 to inner circumferential side faces 241-244 of the container hole 24, the center position of the holder support member 57 in its thickness direction is adhered and fixed to the container hole 24 by injecting the adhesive from the recessed parts 91-94.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device used for recording and reproducing an optical recording disk such as a CD and a DVD. More specifically, the present invention relates to a structure for fixing an objective lens driving device for performing a focusing error correction and a tracking error correction of an objective lens to a frame on which a light source and the like are mounted in an optical pickup device.

[0002]

2. Description of the Related Art As an optical pickup device used for recording and reproducing an optical recording disk such as a CD or a DVD, a lens holder holding an objective lens is driven on a holder supporting member in a focusing direction and a tracking direction of the objective lens. Some objective lens driving devices are mounted on a frame together with a laser light source and the like.

In this type of optical pickup device, a storage hole for mounting the objective lens driving device is formed. After the lower half of the holder support member is stored in the storage hole, the optical axis of the objective lens is adjusted. The inclination of the holder supporting member with respect to the frame is adjusted to adjust the tilt angle, and thereafter, the holder supporting member is bonded and fixed to the frame. At this time, since the upper half of the outer peripheral side of the holder supporting member protrudes upward from the upper surface of the frame, if an adhesive is applied between the opening edge of the storage hole and the outer peripheral side of the holder supporting member,
The holder support member can be adhesively fixed to the frame.

[0004]

Here, in order to respond to the demand for thinning the optical pickup device, the objective lens driving device has been thinned and a tilt adjustment mechanism suitable for such thinning has been devised. Furthermore, a structure is conceivable in which most or all of the objective lens driving device is accommodated in the accommodation hole by making the accommodation hole a deep hole or a through hole.

In such a structure, the holder support member hardly or completely protrudes from the storage hole. Therefore, if an adhesive is applied between the holder support member and the opening edge of the storage hole, the holder support member will not be projected. And the opening edge of the storage hole is bonded and fixed. However, in such an adhesive structure at the upper end of the holder supporting member, each time the adhesive expands or contracts due to a temperature change, the holder supporting member is greatly inclined, and the previously adjusted tilt angle of the objective lens driving device is shifted. For example, the reliability may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and an optical pickup which can stably fix a holder supporting member to a frame even when an objective lens driving device is deeply embedded in a housing hole of the frame. It is to propose a device.

[0007]

In order to solve the above-mentioned problems, the present invention comprises a lens holder for holding an objective lens and a holder supporting member for supporting the lens holder, wherein the lens is mounted on the holder supporting member. In an optical pickup device having an objective lens driving device that magnetically drives a holder in a focusing direction and a tracking direction, and a frame that supports the holder supporting member, the objective lens driving device is provided in a storage hole that is opened at an upper surface of the frame. And a concave portion for injecting an adhesive extending from an opening edge of the storage hole to a center position in a thickness direction of the outer peripheral side surface of the holder supporting member is formed on an inner peripheral side surface in the storage hole, The outer peripheral side surface of the holder supporting member is housed in the holder supporting member by the adhesive injected into the adhesive injecting recess. Characterized in that it is adhesively fixed to the inner circumferential side of the.

In the present invention, the storage hole formed in the frame for storing the objective lens driving device is formed as a deep hole or a through hole, so that most or all of the objective lens driving device is stored in the storage hole. Thus, the thickness of the optical pickup device is reduced. Nevertheless, on the inner peripheral side surface in the storage hole, there is formed an adhesive injection concave portion extending from the opening edge of the storage hole to the center position in the thickness direction of the outer peripheral side surface of the holder supporting member. By injecting the adhesive into the recess, the holder supporting member can be adhesively fixed to the inner peripheral side surface in the storage hole at the center position in the thickness direction of the outer peripheral side surface of the holder supporting member. According to the adhesive fixing at such a position, even if the adhesive expands or contracts due to a temperature change, the adhesive acts on the center position in the thickness direction of the outer peripheral side surface of the holder supporting member. The degree of inclination of the holder supporting member is smaller than when acting on the vertical position in the thickness direction. As a result, the optical axis of the objective lens does not tilt so much.

In the present invention, it is preferable that an adhesive surface of the concave portion for injecting the adhesive has a tapered surface inclined with respect to an outer peripheral side surface of the holder supporting member. That is, it is preferable that the adhesive surface of the concave portion for injecting the adhesive and the outer peripheral side surface of the holder supporting member are not parallel. As described above, when the adhesive surface of the adhesive injection concave portion and the outer peripheral side surface of the holder supporting member are inclined, even when the adhesive expands or contracts due to a temperature change, such expansion or contraction is caused by the holder. Since it is possible to escape in the direction along the outer peripheral side surface of the support member and the inner peripheral side surface in the storage hole, the force for peeling the adhesive from the outer peripheral side surface of the holder support member and the inner peripheral side surface in the storage hole is small. Therefore, the objective lens driving device can be stably adhered to the frame.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical pickup device according to the present invention will be described below with reference to the drawings.

(Overall Configuration) FIG. 1 is a plan view showing the appearance of an optical pickup device according to the present invention. As shown in this figure, the optical pickup device 1 records information on an optical recording disk 5,
A frame 2 for reproducing and arranged in a state facing the recording surface of an optical recording disk 5 such as a CD or DVD.
A light source unit 3 attached to the frame 2, an objective lens 41 for condensing the laser light emitted by the light source unit 3 on the optical recording disk 5, and an objective for driving the objective lens 41 in its focusing direction and tracking direction. A lens driving device 4. The frame 2 includes an FPC board 6 for supplying power to the light source unit 3 and the objective lens driving device 4, and thin plate-like covers 7 and 8 for covering the upper portions thereof for protecting the light source unit 3 and the objective lens driving device 4. Is attached. Frame 2
Are formed on the outer peripheral portion of the optical pickup device 1 with the recording or reproduction of the optical recording disk 5 in two guide holes 21 and a guide portion 22 protruding in a U-shape.
Are guided in the radial direction of the optical recording disk 5 (the direction indicated by the arrow A).

FIG. 2 is an exploded perspective view for explaining the internal structure of the optical pickup device 1 and the structure of the objective lens driving device 4. FIG.
FIG. 3 is a schematic sectional view of a portion cut along the line III-III in FIG. 1. In these figures, the FPC board 6 and the covers 7, 8 are omitted.

As shown in these figures, the objective lens driving device 4 comprises a lens holder 42 holding an objective lens 41 by a lens holder 40 which is thinly extended, and a lens holder 42 which is moved in a focusing direction and a tracking direction which will be described later. And a holder supporting member 57 movably supported by the holder.

The lens holder 42 has a cylindrical body 43
And a cylindrical bearing portion 44 formed at a central portion inside the body portion 43. Tracking driving coils 45 and 46 are attached to the outer peripheral surface of the body 43 at positions facing each other across the bearing 44. A focusing drive coil 47 is wound around the outer peripheral surface of the bearing portion 44. The upper end of the body 43 is covered with a top plate 48, and the objective lens 41 is attached thereto.

The holder support member 57 has a rectangular bottom wall 49, and a support shaft 50 stands upright at the center of the bottom wall 49. The support shaft 50 is inserted inside the bearing portion 44 of the lens holder 42, and supports the lens holder 44 so as to be slidable in the axial direction and rotatable around the axis.

At the outer peripheral edge of the bottom wall 49, four side walls 51 to 54, each of which is a plate-like portion covering the outer peripheral surface of the lens holder 44, stand upright. Inside the bottom wall 49, the two inner walls 55, 56 are opposed to each other with the bearing portion 44 interposed therebetween.
The inner walls 55 and 56 protrude from an opening 58 formed in the top plate 48 of the lens holder 42. Tracking drive magnets 59, 60 are attached to the side walls 51, 53 so as to face the tracking drive coils 45, 46, respectively.
The focusing drive magnets 61 and 62 are attached to 6 so as to face the focusing drive coil 47.

Of these magnets, the focusing drive magnets 61 and 62 have a single-polarized surface facing the focusing drive coil 47.
When a current is applied to the focusing drive coil 47 through the FPC board 64 attached between the side wall 54 of the holder support member 57 and the lens holder 42, a focusing magnetic circuit is formed, and the lens holder 42 is moved in the axial direction of the support shaft 50. Can be done. Therefore, the objective lens 41
Can be moved in the optical axis direction to perform focusing error correction. The tracking drive magnets 59 and 60 are provided with tracking drive coils 45 and 4, respectively.
6, with its surface polarized in the circumferential direction facing the FPC.
Tracking drive coils 45 and 46 through substrate 64
When a current is supplied to the lens holder, a tracking magnetic circuit is formed, and the lens holder 42 can be slightly rotated around the support shaft 50. Therefore, the objective lens 42 can move in the direction orthogonal to the optical axis to perform tracking error correction.

As the holder supporting member 57, an integrally formed product obtained by pressing a magnetic plate material is used.
The bottom wall 49, the side walls 51 to 54, and the inner walls 55, 56
Acts as a yoke for the focusing and tracking magnetic circuits.

(Structure of Frame) On the other hand, the frame 2 is an aluminum die-cast product having a thickness substantially equal to that of the objective lens driving device 4 and extending in the horizontal direction, and includes a light source unit mounting portion 23 to which the light source unit 3 is mounted, and an objective lens. A storage hole 24 is formed, which is surrounded by a frame portion that stands upright with a slight gap formed around the side walls 51 to 54 of the driving device 4, and the objective lens driving device 4 is disposed inside the storage hole 24.

The light source unit 3 has a structure in which a laser light source, a diffraction grating, and a light receiving element (not shown) are integrated, and is arranged in a direction in which the laser light L can be emitted toward the storage hole 24 side. Have been.

The storage hole 24 penetrates in the thickness direction of the frame 2 (the direction indicated by the arrow G) and has a depth corresponding to the thickness dimension of the frame 2. Of the inner peripheral side surface of the storage hole 24,
From the inner peripheral side surface 242 on the side of the light source unit mounting portion 23, a mirror mounting portion 25 whose slope is directed toward the light source unit 3 at an inclination of approximately 45 ° projects inward.
The total reflection mirror 11 is mounted on the optical element mounting section 25, and the reflection surface of the total reflection mirror 11 is directed obliquely upward with an inclination of approximately 45 °. Therefore, the laser light L emitted from the laser light source of the light source unit 3 is raised by the total reflection mirror 11 and enters the objective lens 41 of the objective lens driving device 4 attached to the storage hole 24,
The light is focused on the recording surface of the optical recording disk 5. The return light from the optical recording disk 5 follows the same path again, is irradiated to the light receiving element of the light source unit 3, and reproduces the optical recording disk 5 based on the return light. The light receiving element also detects a tracking error signal and a focusing error signal included in the return light, and the objective lens driving device 4 drives the objective lens 41 in the tracking direction and the focusing direction based on the signals.

(Stored state of the objective lens driving device) On the holder supporting member 57 side of the objective lens driving device 4, a vertical line extending in the radial direction of the optical recording disk 5 (the direction indicated by arrow A) near the objective lens 41. An opening 63 is formed in the side wall 52 from the lower half to the bottom wall 49. When the objective lens driving device 4 is disposed in the storage hole 24 formed in the frame 2, the opening 63 interferes with the mirror mounting portion 25 and the total reflection mirror 11 formed in the frame 2 and the holder support member 57. It is an escape part to prevent. Therefore, when the objective lens driving device 4 is stored in the storage hole 24, the mirror mounting portion 25 and the total reflection mirror 11 enter the inside of the holder support member 57 from the opening 63 of the holder support member 57. For this reason, the position of the bottom wall 49 of the holder support member 57 is lowered to near the bottom surface of the frame 2. The objective lens driving device 4 is configured to be slightly thinner than the thickness of the frame 2, and
Since the position of the bottom wall 49 is lowered to the bottom surface of the frame 2, the objective lens driving device 4 has no portion protruding up and down from the frame 2 and is completely housed in the frame 2.

(Structure of Tilt Adjusting Mechanism) In the optical pickup apparatus 1 thus configured, as shown in FIG. 2, a tilt adjusting mechanism 100 for adjusting the tilt of the optical axis of the objective lens 41 at the time of assembly is configured. Have been. The configuration of the tilt adjustment mechanism 100 will be described below.

First, on the side of the frame 2, two thin plate-like portions 26 rising toward the holder supporting member 57 are located on both sides of the optical axis L near the mirror mounting portion 25.
These plate-like portions 26 are provided on the optical recording disk 5.
(Tangential direction / direction indicated by arrow B). Of these plate-like portions 26,
On the one plate-like portion 26, a plate-like portion 27 one step higher (a plate-like portion for forming a fulcrum described later) is formed so as to form a step 261. The upper edge of the plate-like portion 27 has V
A letter-shaped notch 28 is formed.

In the frame-like portion constituting the storage hole 24 of the frame 2, the notch 28 is inserted through the optical recording disk 5.
A first hole 31 that penetrates the frame 2 in the thickness direction is formed at one portion that intersects a line 29 that extends horizontally in the radial direction (the direction indicated by the arrow A). A second hole penetrating the frame 2 in the thickness direction is provided at one portion intersecting a line 30 extending horizontally from the notch 28 in the tangential direction of the optical recording disk 5 (the direction indicated by arrow B). 32 are formed. The upper surface of the frame portion where the first and second holes 31 and 32 open is a horizontal plane, and is set at a position substantially equal to the height of the notch 28.

On the other hand, on the holder support member 57 side,
An inverted V-shaped notch 65 is formed in a lower edge portion of the side wall 52 in which the opening 63 (escape portion) is formed. When the holder support member 57 is disposed inside the storage hole 24 of the frame 2, the notch 65 straddles the notch 28 of the plate-like portion 27 formed in the frame 2 as shown in FIG. In this state, the leaf spring 12 having a U-shaped cross section is mounted so as to sandwich the holder supporting member 57 and the frame 2, and the holder supporting member 57 is fixed so as to be pressed toward the frame 2. With this configuration, since the leaf spring 12 can be elastically deformed, the holder supporting member 57 can swing about the overlapping portion of the notch 65 of the side wall 52 and the notch 28 of the frame 2 as the fulcrum 17. .

The side wall 53 adjacent to the side wall 52 has
A first flange portion 67 that is bent horizontally from the upper edge toward the outside is formed, and when the holder supporting member 57 is disposed inside the storage hole 24 of the frame 2, the fulcrum 17 is formed.
A first adjusting portion 81 for adjusting the tilt angle of the holder supporting member 57 in the radial direction with the center as the center is formed. In addition, a second flange 69 is formed on the side wall 54 facing the side wall 52 so as to bend horizontally from the upper edge to the outside.
The holder support member 57 is inserted into the storage hole 24 of the frame 2 there.
A second adjusting portion 82 for adjusting the inclination angle of the holder supporting member 57 in the tangential direction with the fulcrum 17 as a center when it is arranged inside is formed.

FIG. 5 is a cross-sectional view taken along the line VV shown in FIG.

As shown in FIG. 5, the first adjusting unit 81
A first inclination adjusting screw 15 that passes through a first hole 31 formed in the frame 2 and stops in a first screw hole 68 formed in the first flange 67; the first flange 67 and the frame; The first coil spring 13 is sandwiched between the two. Frame 2
A counterbore is formed on the upper surface side and the lower surface side in the first hole 31 formed in the first hole 31. The first coil spring 13 is housed inside the counterbore portion on the upper surface side, and the first tilt angle adjustment is performed. The screw 15 is housed in a counterbore portion on the lower surface side. As a result, the first flange portion 67 formed on the side wall 53 of the holder support member 57 is fixed to the frame 2 with the first coil spring 13 compressed. Therefore, the first inclination adjusting screw 15
Is rotated, the tilt angle of the holder support member 57 in the radial direction about the fulcrum 17 can be adjusted as shown by arrows C and D.

FIG. 6 is a sectional view of a portion cut along the line VI-VI shown in FIG.

As shown in FIG. 6, the second adjusting section 82
A second inclination adjusting screw 16 that passes through a second hole 32 formed in the frame 2 and stops in a second screw hole 70 formed in the second flange 69; the second flange 69 and the frame; 2 is provided with a second coil spring 14 interposed therebetween. Frame 2
A counterbore is formed on the upper surface side and the lower surface side of the second hole 32 formed in the second hole 32. The second coil spring 14 is housed inside the counterbore portion on the upper surface side, and the second tilt angle adjustment is performed. The screw 16 is housed in a counterbore portion on the lower surface side. As a result, the second flange 69 formed on the side wall 54 of the holder support member 57 is fixed to the frame 2 in a state where the second coil spring 14 is compressed. Therefore, the second tilt adjustment screw 16
Is rotated, the inclination angle of the holder support member 57 in the tangential direction about the fulcrum 17 can be adjusted as shown by arrows E and F.

After the adjustment of the tilt angle of the objective lens 41 is completed, the objective lens driving device 4 is bonded and fixed to the frame 2 with an adhesive 19 as shown in FIG.

(Adhesive Fixing Structure of Holder Supporting Member and Frame) In performing this adhesive fixing, the holder supporting member 57 is simply coated with an adhesive on the opening edge of the storage hole 24.
In the present embodiment, as shown in FIGS. 1 and 2, the frame 2 is provided around the storage hole 24 between the objective lens driving device 4 and the frame 2 because the upper end portion of the Four recesses 91 to 94 for injecting the adhesive 19 for injecting the adhesive 19 are formed.

The concave portions 91 to 94 for injecting the adhesive are formed on the outer peripheral side surfaces 71 to 74 (side walls 5) of the holder supporting member 57.
The outer peripheral side surfaces of the holder support member 5 are formed on the inner peripheral side surfaces 241 to 244 of the storage hole 24 respectively facing the outer peripheral side surfaces 241 to 244.
7 can be bonded and fixed to the frame 2 from all sides.

Here, the concave portions 91 and 93 for injecting the adhesive are
At substantially the center in the direction in which the inner peripheral side surfaces 241 and 243 extend (arrow B), the storage hole 24
When the holder supporting member 57 is stored in the outer peripheral side surface 71,
73 are respectively formed so as to reach a position corresponding to a central position in the thickness direction. The adhesive injecting concave portion 92 is located at a position adjacent to the mirror mounting portion 25.
The outer peripheral side surfaces 72 are formed so as to reach from the opening edge of the storage hole 24 to a position corresponding to the center position in the thickness direction of the outer peripheral side surface 72 when the holder support member 57 is stored in the storage hole 24. Further, the adhesive injecting concave portion 94 is positioned at a position adjacent to the second adjusting portion 82 from the opening edge of the storage hole 24 to the thickness direction of the outer peripheral side surface 74 when the holder supporting member 57 is stored in the storage hole 24. Are formed so as to reach a position corresponding to the central position in the.

In addition, any of the recesses 91 to 9 for injecting the adhesive is used.
4 is deeper on the inner peripheral side of the storage hole 24 and shallower from the inner peripheral side to the outer peripheral side, and any of the adhesive surfaces 911 and 9 corresponding to the bottom surfaces of any of the adhesive injection concave portions 91 to 94.
21, 931, 941 also have tapered surfaces 95 to 98, as shown in FIG.

The optical pickup device 1 configured as described above
Then, the storage hole 2 for storing the objective lens driving device 4
By making the hole 4 deep enough to penetrate the frame 2, most of the objective lens driving device 4 is housed in the housing hole 24, and the thickness of the optical pickup device 1 is reduced.
Nevertheless, the inner peripheral side surfaces 241 to 244 in the storage hole 24 are provided with the holder support member 57 from the opening edge 240 of the storage hole 24.
Since the adhesive injecting concave portions 91 to 94 are formed up to the center position in the thickness direction of the outer peripheral side surfaces 71 to 74, the adhesive 19 is injected into each of the adhesive injecting concave portions 91 to 94. Outer side surface 7 of holder support member 57
The holder support member 57 can be adhesively fixed to the inner peripheral side surfaces 241 to 244 in the storage hole 24 at the center position in the thickness direction of 1 to 74. According to the bonding and fixing at such a position, even if the adhesive 19 expands or contracts due to a temperature change, it acts on the center position in the thickness direction of the outer peripheral side surfaces 71 to 74 of the holder supporting member 57. Acts on the vertical position at the center position in the thickness direction, the degree of inclination of the holder supporting member 57 is smaller. As a result, the optical axis of the objective lens 41 is not so inclined.

Further, the adhesive surfaces 911, 921, 931 and 941 of the adhesive injection concave portions 91 to 94 are formed on the outer peripheral side surface 71 of the holder support member 57 as described with reference to FIG.
The taper surfaces 95 to 98 are inclined with respect to. Therefore, the adhesive surface 9 of the adhesive injection concave portions 91 to 94
11, 921, 931 and 941 and the holder support member 57
Is not parallel to the outer peripheral side surfaces 71 to 74 (adhesion surface) of
Even when the adhesive 19 expands or contracts due to a temperature change, such expansion or contraction is indicated by arrows G and H, as shown by arrows G and H, on the outer peripheral side surfaces 71 to 74 of the holder support member 57 and the inner peripheral side surface in the storage hole 24. It is possible to escape in a direction along 241 to 244. Therefore, the outer peripheral side surfaces 71 to 74 of the holder support member 57 and the inner peripheral side surface 24 in the storage hole 24 are provided.
The force at which the adhesive 19 tends to peel off from 1 to 244 is small. Therefore, the objective lens driving device 4 can be bonded and fixed to the frame 2 in a stable state.

(Modification of Adhesive Injection Depression) In the above embodiment, the bonding surfaces 911 and 9 of the adhesive injection indentations 91 to 94 are provided.
21, 931, 941 are all tapered surfaces 95 to 98, but the present invention provides an adhesive surface 911, 921, 93.
It suffices that a part of the first and 941 be tapered surfaces 95 to 98.

For example, as shown in FIG. 8A, the adhesive surfaces 911, 921, 9 of the concave portions 91A to 94A for injecting the adhesive.
31 and 941, upper side 912, 922, 932, 9
42 is formed in parallel to the outer peripheral side surfaces 71 to 74 of the holder support member 57, and the lower side 913, 923, 9
33 and 943 are tapered surfaces 95 to 98 which are shallow on the outer peripheral side of the storage hole 24 and deeper from the storage hole 24 toward the inner peripheral side.
May be formed.

As shown in FIG. 8B, the adhesive surfaces 911, 921, 93 of the concave portions 91B to 94B for injecting the adhesive.
1, 941, the upper side 912, 922, 932, 94
2 is formed on a tapered surface 95 to 98 which is shallow on the outer peripheral side of the storage hole 24 and becomes shallower from the outer peripheral side toward the inner peripheral side;
The lower side 913, 923, 933, 943 may be formed in parallel with the outer peripheral side surfaces 71 to 74 of the holder supporting member 57.

The adhesive injection recess 91A having such a shape.
To 94A, 91B to 94B, the adhesive surfaces 911, 92
Since a part of 1, 931, 941 is not parallel to the outer peripheral side surfaces 71 to 74 (adhesion surface) of the holder support member 57, even when the adhesive 19 expands or contracts due to a temperature change,
Such expansion or contraction can be released in the direction along the outer peripheral side surfaces 71 to 74 of the holder support member 57 and the inner peripheral side surfaces 241 to 244 in the storage hole 24 as shown by arrows G and H. Therefore, the outer peripheral side surfaces 71 to 74 of the holder supporting member 57 and the inner peripheral side surfaces 241 to
The force that the adhesive 19 tends to peel from the 244 is small.
Therefore, the objective lens driving device 4 can be bonded and fixed to the frame 2 in a stable state.

(Other Embodiments) In the above embodiment, in order to most efficiently reduce the thickness of the optical pickup device 1, the storage holes 24 formed in the frame 2 penetrate the frame 2 in the thickness direction. However, the opening only needs to be opened at least on the upper surface in the thickness direction of the frame 2 and does not have to penetrate.

In the above embodiment, the adhesive injection concave portions 91 to 94 are inclined in the thickness direction due to the formation of the tapered surfaces 95 to 98, but are inclined in the circumferential direction of the holder supporting member 57. Adhesive recesses 91 to 9
4 and the outer peripheral side surfaces 71 to 7 of the holder support member 57
4 (adhesion surface) need not be parallel.

Further, the number, size, and formation position of the adhesive injection concave portions 91 to 94 are not limited to the above. Further, the present invention is also applicable to bonding of a hologram element or other optical elements.

[0046]

As described above, in the optical pickup device of the present embodiment, most or all of the objective lens driving device can be accommodated in the accommodation hole of the frame, and the optical pickup device can be made thinner. It is. Nevertheless, since the recess for injecting the adhesive from the opening edge to the center position in the thickness direction of the outer peripheral side surface of the holder supporting member is formed on the inner peripheral side surface of the storage hole, the holder supporting member is stored at this central position. It can be adhesively fixed to the inner peripheral side surface in the hole. According to the adhesive fixing at such a position, even if the adhesive expands or contracts due to a temperature change and the holder supporting member is inclined with respect to the frame, the center position in the thickness direction of the outer peripheral side surface of the holder supporting member is centered. Therefore, the objective lens driving device and the frame can be adhesively fixed in a stable state such that the optical axis of the objective lens hardly tilts.

[Brief description of the drawings]

FIG. 1 is a plan view showing an appearance of an optical pickup device of the present invention.

FIG. 2 is an exploded perspective view for explaining the structure of the device shown in FIG.

FIG. 3 is a sectional view of a portion cut along a line III-III in FIG. 1;

FIG. 4 is an enlarged perspective view showing a portion serving as a swing fulcrum at the time of adjusting the tilt angle in the device shown in FIG. 1;

FIG. 5 is a sectional view of a portion cut along a line VV in FIG. 1;

FIG. 6 is a sectional view of a portion cut along a line VI-VI in FIG. 1;

FIG. 7 is a cross-sectional view showing a portion cut along the line VII-VII in FIG. 1;

FIGS. 8A and 8B are cross-sectional views showing modified examples of the concave portion for adhesive injection.

[Explanation of symbols]

Reference Signs List 1 optical pickup device 2 frame 3 light source unit 4 objective lens driving device 5 optical recording disk 11 total reflection mirror 12 leaf spring 13 first coil spring 14 second coil spring 15 first inclination adjusting screw 16 second inclination Adjustment screw 17 Support point 19 Adhesive 24 Storage hole 25 Mirror mounting portion 27 Frame-side plate-shaped portion 28 V-shaped notch on frame side 29 Line connecting the fulcrum and the screwing position of the first tilt adjustment screw 30 line connecting the fulcrum and the screw position of the second tilt adjustment screw 40 lens holding part 41 objective lens 42 lens holder 45, 46 tracking drive coil 47 focusing drive coil 49 bottom wall 51, 52 of holder support member , 53, 54 Side wall of holder support member 57 Holder support member 59, 60 Drive magnet for tracking G, 61, 62 Focusing drive magnet 67 First flange portion 68 Second flange portion 71, 72, 73, 74 Outer peripheral side surface of holder support member 81 First adjustment portion 82 Second adjustment portion 91-94, 91A -94A, 91B-94B Recessed portions 95, 96, 97, 98 Tapered surface 100 Inclination adjustment mechanism 240 Opening edge of storage hole 241, 242, 243, 244 Inner peripheral side surface of storage hole 911, 921, 931, 941 Adhesion surface of concave portion L laser light

Claims (2)

[Claims] 1. An objective lens driving device comprising: a lens holder for holding an objective lens; and a holder support member for supporting the lens holder, wherein the objective lens driving device magnetically drives the lens holder on the holder support member in a focusing direction and a tracking direction. An optical pickup device having a frame that supports the holder support member, wherein the objective lens driving device is disposed in a storage hole that is opened at an upper surface portion of the frame, and on an inner peripheral side surface in the storage hole, An adhesive injecting recess is formed from the opening edge of the storage hole to a center position in the thickness direction of the outer peripheral side surface of the holder supporting member, and the adhesive injected into the adhesive injecting recess forms the holder supporting member. The optical pick-up is characterized in that the outer peripheral side of the optical pick-up is adhesively fixed to the inner peripheral side of the holder support member storage hole. Up device. 2. The optical pickup device according to claim 1, wherein the adhesive surface of the adhesive injection recess has a tapered surface inclined with respect to the outer peripheral side surface of the holder supporting member.