JP2003257049A - Member connecting and fixing structure and optical head having the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member connecting and fixing technology applicable to the three-dimensional adjustment of a photodetector provided in an optical head, in which workability is excellent and a position deviation after adhesion is small. <P>SOLUTION: Two columnar projections 15 are projectingly provided on the photodetector holding plate attaching surface 21 of a case 9. On both sides in the long side direction of a photodetector holding plate 13, two elliptic holes 14 for which the long side direction is a short diameter are opened at the same interval as the set interval of the projections 15. The projections 15 projectingly provided on the case 9 are inserted to the elliptic holes 14 opened on the photodetector holding plate 13 and the tip parts are projected outwards from the outer surface of the photodetector holding plate 13. An adhesive 16 is supplied to a part including the projected tip parts of the projections 15 and the outer surface of the photodetector holding plate 13, it is irradiated with an ultraviolet ray 27 and the adhesive 16 is hardened. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting and fixing structure for members and an optical head having this structure, and more particularly to a connecting and fixing structure for a case of a photodetector provided in the optical head.

[0002]

2. Description of the Related Art An example of a conventionally known optical head will be described with reference to FIG. The laser light 10 emitted from the semiconductor laser 1 passes through the polarization beam splitter 2 and becomes a parallel light flux by the collimator lens 3. The laser light 10 transmitted through the collimator lens 3 reaches the objective lens 6 via the mirror 4 and is condensed by the objective lens 6 on the recording film surface of the optical disc 8. The laser beam 11 reflected by the recording film surface reaches the polarization beam splitter 2 via the objective lens 6, the mirror 4 and the collimator lens 3, and is reflected by the polarization beam splitter 2 to change its direction. The laser light 18 reflected by the polarization beam splitter 2 enters the photodetector 7 mounted on the photodetector holding plate 20 by the detection lens 19. Photo detector 7
Converts the reflected light signal from the optical disk 8 into an electric signal and detects an information signal and a servo signal.

The photodetector 7 is set by positioning the photodetector holding plate 20 to the case 9 using a fixing means such as screwing or bonding after the photodetector 7 is positioned at the optimum position for the laser light 18. Positioning of the photodetector 7 at the optimum position with respect to the laser light 18 is performed by moving the photodetector 7 itself in the direction perpendicular to the laser light 18. Further, regarding the direction of the laser beam 18,
This is performed by moving the detection lens 19 or the photodetector 7.

Of the two methods of positioning the photodetector 7 at the optimum position with respect to the direction of the laser beam 18, the detection lens 19 is moved in the direction of the light beam to adjust the position on the photodetector 7. According to the method, since the photodetector holding plate 20 can be directly fixed to the case 9, it is easy to fix the photodetector holding plate 20 to the case 9, but the detection lens 19
Is required to be moved in the direction of the laser light 18 and the photodetector 7 in the direction perpendicular to the laser light 18,
There is a problem that the positioning work becomes complicated. Further, there is a problem that it is difficult to reduce the size of the optical head because a place where the detection lens 19 is provided in the passage of the laser light 18 is required.

On the other hand, of the two positioning methods, the method of moving the photodetector 7 in the light beam direction to adjust the position is as follows.
Since the detection lens 19 can be omitted, it is advantageous for downsizing the optical head, but on the other hand, since it is necessary to adjust the position of the photodetector 7 in the three-dimensional direction, positioning work at an optimum position and There is a problem that it is difficult to fix the photodetector 7 at the optimum position. That is, in order to fix the photodetector 7 at the optimum position, a required clearance is provided between the case 9 and the detector 19 or between the case 9 and the holding member of the photodetector 7, and the adhesive is adhered to the clearance. It is necessary to fill and fix the agent. However, in order to adjust the position of the photodetector 7 in the luminous flux direction, a mechanism for holding the photodetector 7 and adjusting the set position is required. If an attempt is made to fill the space between the case 9 and the adhesive while holding the
It is difficult to improve the work efficiency because the holding adjustment mechanism of is disturbing. Further, when an ultraviolet curable resin is used as the adhesive, it is necessary to irradiate the adhesive filled in the required clearance with ultraviolet rays to cure it, but the retention adjustment mechanism disturbs the irradiation. Since it is difficult to apply ultraviolet rays to the part, it is difficult to uniformly cure the adhesive. In addition, when adhering the photodetector holding plate 20 to the case 9, only the adhesive layer is held between the photodetector holding plate 20 and the case 9, so that stress during curing of the adhesive and There is also a problem that since there is no restraint portion against external force, a position shift is likely to occur and the reliability after adjustment is likely to decrease.

By the way, Japanese Patent Laid-Open No. 9-296155 discloses a first work having a through hole having a first opening and a second opening having a diameter smaller than the first opening, and a protrusion having a diameter smaller than the second opening. In a bonding device in which the protrusion is inserted from the second opening, the second work having is filled with the photocurable adhesive from the first opening, and the two are bonded to each other, the photocurable adhesive is applied from the first opening. A first irradiation unit for irradiating light for curing,
A second irradiation unit that irradiates the light from the second opening and an irradiation control unit that uniformizes the stress generated when the light curable adhesive is cured by the light emitted from the first and second irradiation units, respectively. An adhesive device characterized by being provided is disclosed. If this adhesive device is applied, in principle, the photodetector 7
It is possible to solve the above-mentioned problems that occur when positioning is performed at the optimum position.

However, in the technique disclosed in Japanese Patent Laid-Open No. 9-296155, a through hole having a first opening and a second opening having a diameter smaller than the first opening is formed in the first work, and the second work is formed. In addition, since the protrusion having a smaller diameter than the second opening and the tip of which is formed in a conical shape is formed, the first work and the second work are likely to be large in size, and it is practically difficult to apply to the manufacture of an optical head. is there. Further, since the first irradiation unit that irradiates the curing light of the adhesive from the first opening and the second irradiation unit that irradiates the curing light of the adhesive from the second opening are provided, the device becomes large, and from this point as well. There is a problem that it is difficult to apply to the manufacture of optical heads.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and is applicable to three-dimensional adjustment of a photodetector provided in an optical head, and
An object of the present invention is to provide a technique for connecting and fixing a member having excellent workability and having a small positional deviation after bonding.

[0009]

In order to solve the above problems, the present invention relates to a structure for connecting and fixing members, wherein a first member provided with a hole or a notch and a member can be inserted into the hole or the notch. A second member provided with a different projection, and connecting and fixing the first member and the second member with an adhesive in a state where the projection is inserted into the hole or the notch. In the connection fixing structure, a tip portion of the protrusion inserted into the hole or the notch projects from the outer surface of the first member, and includes at least the tip portion of the projected protrusion and the outer surface of the first member. Is connected and fixed via the adhesive.

As described above, when the protrusion provided on the second member is inserted into the hole or the notch provided on the first member, the three-dimensional adjustment of the first member with respect to the second member can be easily performed. Therefore, the connection and the fixation between the members can be performed with high accuracy. Further, the tip end portion of the projection inserted into the hole or the notch is projected from the outer surface of the first member, and at least the portion including the tip end portion of the projected projection and the outer surface of the first member is connected via an adhesive. When fixed, it is sufficient to supply the adhesive and irradiate the curing light only from the protruding side of the projection, so it is easy to supply the adhesive to the required part and irradiate the curing light, and to fix the connection between the members. It can be done with high efficiency. Furthermore, since the adhesive can be uniformly cured by irradiating the curing light from one direction, it is possible to prevent the position shift of the cured member.

Further, according to the present invention, the hole is an elongated hole or an elliptical hole, and the notch is a groove-shaped notch having a width larger than a depth.

When the hole shape or the notch shape is set in this way, the adhesive supply site can be widened, so that the operation of supplying the adhesive can be facilitated and a sufficient amount of the adhesive can be supplied. Therefore, the rigidity of the adhesive portion can be increased, and the durability of the adhesive portion can be increased.

Further, according to the present invention, between the inner surface of the hole or notch and the outer surface of the protrusion, and between the second member facing surface of the first member and the first member mounting surface of the second member. Also, it is configured such that the adhesive is filled.

Thus, not only between the tip of the projection and the outer surface of the first member, but also between the inner surface of the hole or notch and the outer surface of the projection, and between the second member facing surface of the first member and the first member. By filling the adhesive between the first member mounting surface of the two members as well, the first member and the second member can be more securely connected and fixed, and the durability of the bonded portion can be improved.

Further, according to the present invention, at least the second member mounting surface of the second member is made of a material having a high reflectance of adhesive curing light.

As described above, if at least the first member mounting surface of the second member is made of a material having a high reflectance of adhesive curing light,
Since the adhesive curing light reflected by the first member mounting surface of the second member can be irradiated onto the adhesive, the adhesive can be irradiated only by the light directly irradiated onto the adhesive from the adhesive curing light irradiation device. As compared with the case of curing, the adhesive can be cured quickly and uniformly.

Further, according to the present invention, at least the first member mounting surface of the second member is made of aluminum die cast.

Since aluminum die cast has a high reflectance of ultraviolet rays, if at least the first member mounting surface of the second member is made of aluminum die cast, the ultraviolet ray reflected by the first member mounting surface of the second member will be adhesive. The UV curable adhesive can be rapidly and uniformly cured, compared to the case where the UV curable adhesive is cured only by the light that is directly irradiated to the adhesive by the UV irradiation device. You can

On the other hand, regarding the optical head, a light source, an objective lens for converging laser light emitted from the light source on the recording film surface of the optical disc, and light for detecting reflected light reflected by the recording film surface of the optical disc. In an optical head including a detector, a holding plate holding the photodetector, and a case that integrally holds these members, a hole or a cutout is provided in the holding plate, and the holding plate is provided in the case. A protrusion that can be inserted into a hole or a notch provided in the hole, the tip of the protrusion inserted into the hole or the notch protrudes from the outer surface of the holding plate, and at least the tip of the protruded protrusion And a portion including the outer surface of the holding plate is connected and fixed via an adhesive.

As described above, when the protrusion provided on the case is inserted into the hole or notch provided on the holding plate, the three-dimensional adjustment of the holding plate with respect to the case can be easily performed, so that the connection between the members is performed. Fixing can be performed with high accuracy. Further, when the tip of the protrusion inserted into the hole or the notch is projected from the outer surface of the holding plate, and at least a portion including the tip of the projected protrusion and the outer surface of the holding plate is connected and fixed via an adhesive. Since it is sufficient to supply the adhesive and to irradiate the curing light only from the protruding side of the protrusion, it is easy to supply the adhesive to the required part and irradiate the curing light, and it is possible to efficiently connect and fix the members. Can be done. Furthermore, since the adhesive can be uniformly cured by irradiating the curing light from one direction, it is possible to prevent the position shift of the cured member. Therefore, it is possible to provide an optical head that is small in size, high in performance, and excellent in reliability and durability.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention will be described below.
This will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a configuration of an optical head according to an exemplary embodiment, FIG. 2 is a perspective view showing an arrangement and optical paths of optical components provided in the optical head according to an exemplary embodiment, and FIG. 3 is a first exemplary embodiment. It is an explanatory view showing a configuration of a photodetector fixing portion of the optical head according to.

As shown in FIG. 1, the optical head according to the present embodiment includes a semiconductor laser 1, a polarization beam splitter 2,
Collimating lens 3, mirror 4, compound polarization diffraction grating 5,
It includes an objective lens 6, a photodetector 7, a photodetector holding plate (first member) 13, and a case (second member) 9 that integrally holds these members. The case 9 is formed by aluminum die casting, and a guide shaft 32 provided on the base member 31 by a transfer device (not shown).
Along the optical disk 8 in the radial direction.

Laser light 1 emitted from semiconductor laser 1
As shown in FIG. 2, 0 passes through the polarization beam splitter 2 and then becomes a parallel light flux by the collimator lens 3, reaches the objective lens 6 through the mirror 4 and the composite polarization diffraction grating 5, and the optical disc 8 is recorded by the objective lens 6. It is focused on the film surface. Laser light reflected by recording film surface 11
Passes through the objective lens 6 to reach the composite polarization diffraction grating 5, and the polarization direction of the composite polarization diffraction grating 5 is changed by 90 degrees. The laser light 11 transmitted through the composite polarization diffraction grating 5 is
The laser light 11 reaching the polarization beam splitter 2 via the mirror 4 and the collimator lens 3 is polarized with the laser light 10 emitted from the semiconductor laser 1 by the action of the composite polarization diffraction grating 5. Since the direction is changed by 90 degrees, it is reflected by the polarization beam splitter 2. The laser light 18 reflected by the polarization beam splitter 2 reaches the photodetector 7,
The photodetector 7 converts the electric signal. As a result, the information signal and the servo signal are detected. The polarization beam splitter 2 transmits almost 100% of the laser light 10 emitted from the semiconductor laser 1 and directed to the optical disk 8, and approximately 100% of the laser light 11 reflected by the optical disk 8 and directed to the photodetector 7. %reflect.

As shown in FIG. 3A, two cylindrical projections 15 are provided on the photodetector holding plate mounting surface 21 of the case 9 in the same direction (z direction). Also, FIG.
As shown in (b), on both sides of the photodetector holding plate 13 in the long side direction (x direction), the same intervals as the set intervals of the protrusions 15 are provided, and the long side direction has a minor axis 2. One elliptical hole 1
4 has been opened. The diameter of the protrusion 15 is smaller than the minor diameter of the elliptical hole 14,
The protrusion 15 can be inserted therein. As shown in FIGS. 3 (a) and 3 (b), the photodetector holding plate 13 has the tip of the projection 15 inserted into the elliptical hole 14 projected from the outer surface of the photodetector holding plate 13. By supplying the adhesive 16 to a portion including the tip of the protrusion 15 and the outer surface of the photodetector holding plate 13, the case 9
Fixed to connect to. In the example of FIGS. 3A and 3B, the tips of the protrusions 15 and the photodetector holding plate 13 are projected.
Not only between the outer surface of the elliptical hole 14 and the inner surface of the elliptical hole 14 and the projection 15
The adhesive 16 is also filled between the outer surface of the photodetector holding plate 13 and the case detecting surface of the photodetector holding plate 13 and the mounting surface 21 of the case 9 on the photodetector holding plate. However, the projection 15 is not limited to
Adhesive 1 between the tip of the photodetector and the outer surface of the photodetector holding plate 13.
It is sufficient if 6 is supplied. This photodetector holding plate 13
The photodetector 7 is fixed to the central portion of the device by means such as adhesion.

Next, the photodetector holding plate 1 for the case 9
The connection fixing method of No. 3 will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a method for adjusting the photodetector holding plate and a method for irradiating adhesive curing light according to the embodiment.

First, as shown in FIG. 4, both ends of the photodetector holding plate 13 having the photodetector 7 fixed in advance at a predetermined position are held by holding arms 24, and the photodetector 7 is attached to the case 9 side. The projection 15 protruding from the case 9 into the elliptical hole 14 formed in the photodetector holding plate 13 toward the
The tip of the optical disc 5 is projected outward from the outer surface of the photodetector holding plate 13.

In this state, the holding arm 24 is driven in the three directions of x, y and z, and the photodetector 7 receives the reflected light 18 from the optical disk 8 to a position where an accurate information signal and servo signal can be detected. Set.

Next, an ultraviolet curable adhesive 16 is supplied from the outer surface side of the photodetector holding plate 13 to the elliptical hole 14 using a dispenser (not shown), and at least the tip of the projection 15 and the outer surface of the photodetector holding plate 13 are provided. Adhesive 16 is applied between and.

As described above, in the optical head of this example, since the ellipsoidal hole 14 is formed in the photodetector holding plate 13, the outer surface of the photodetector holding plate 13 is placed in the clearance between the photodetector holding plate 13 and the case 9. The adhesive 16 can be applied from the side, and the operation of applying the adhesive 16 can be easily performed. Also,
By forming the elliptical hole 14, two large gaps can be formed between the long diameter side of the elliptical hole 14 and the columnar protrusion 15. Therefore, when a required amount of adhesive is applied to the elliptical hole 14 by the dispenser, the adhesive is applied due to surface tension. The agent 16 flows from both sides toward the narrow side of the gap, joins at the short diameter part of the ellipse, and the entire circumference is applied between the outer periphery of the protrusion 15 and the inner periphery of the elliptical hole 14, and at the same time, the photodetector holding plate 13 Due to surface tension, it penetrates into the gap 22 between the photodetector holding plate mounting surface 21 of the case 9 and
Penetrates to the point where it balances with viscous force.

The rigidity of the joint between the photodetector holding plate 13 and the case 9 increases as the ratio of the area and the thickness of the joint increases. X-direction, y-direction, and z necessary for adjusting the photodetector 7
Since the amount of movement in the direction is about 0.3 mm, which is almost the same,
A clearance 22 between the detector holding plate 13 and the mounting surface 21,
The gap 23 between the protrusion 15 and the short diameter portion of the elliptical hole 14 has the same size. The thickness of the detector holding plate 13 is 0.6 mm,
The diameter of the protrusion 15 is 1 mm. From these dimensions, the minor diameter of the elliptical hole 14 is 1.8 mm and the clearance 22 is 0.4 mm.
The major axis of the elliptical hole 14 is set to 2.8 mm in consideration of the ease of applying the adhesive. The amount of the adhesive 16 penetrating into the clearance 22 does not change extremely depending on the size of the clearance 22 at the time of adjustment. As can be seen from FIG. 3, the mounting surface 21 and the elliptical hole 1
The peripheral portion of 4 has the longest length and the largest contribution to the rigidity. Although the amount of the adhesive 16 applied is constant, even if the clearance 22 is changed by adjustment, the excess adhesive 16 is not included in the surface position of the adhesive 16 in the space between the long diameter side of the elliptical hole 14 and the projection 15. Absorbed as a change,
The fluctuation of the adhesive application area in the portion that greatly affects the rigidity and strength of the joint between the photodetector holding plate 13 and the case 9 is small. Therefore, the adhesive strength and the like are stable.

After the adhesive 16 is applied to the elliptical hole 14, as shown in FIG. 4, the tip of the light guide fiber 26 led out from the ultraviolet light source 25 is directed obliquely toward the elliptical hole 14.
Ultraviolet rays 27 are irradiated to cure the adhesive 16. Since the ultraviolet rays 27 that have entered the adhesive are absorbed by the adhesive 16, the strength thereof decreases as going from the surface to the back.
Therefore, in the case of ultraviolet curing, generally, the adhesive is cured first on the surface side and delayed on the back side. Since the adhesive generally shrinks when it hardens, if the deviation of the hardening timing becomes large, the already hardened portion will be pulled by the hardened portion later, and residual stress will occur. Since the residual stress in the adhesive is released when the temperature becomes high, the relative positions of both ends of the adhesive are displaced when the temperature once becomes high and the temperature returns to room temperature. This tendency becomes more remarkable as the thickness of the adhesive or the distance through which the ultraviolet rays pass increases, so it is necessary to make the thickness of the portion irradiated with the ultraviolet rays smaller. From this point of view, in the method of maintaining the adhesive force between the elliptical hole 14 provided in the photodetector holding plate 13 and its peripheral portion, the ultraviolet rays 27 are irradiated toward the elliptical hole 14, so that the thickness of the adhesive 16 is compared. Since it can be made extremely thin, it is advantageous from the viewpoint of reducing the residual stress. As shown in FIG. 4, the ultraviolet light sources 25 are arranged symmetrically in the left-right direction (yz plane),
When ultraviolet rays are radiated to the elliptical holes 14 arranged symmetrically, the ultraviolet rays 27 emitted from the light guide fiber 26 are divergent light. Therefore, for example, from the right ultraviolet light source 27 (right) irradiating the right elliptical hole as a target. Part of the ultraviolet rays 27 (right) of the left elliptical hole 14 (left) opposite to the elliptical hole 14 (right)
Irradiate. Therefore, the left elliptical hole 14 (left) is not limited to the left ultraviolet light source 26 (left) but also the right ultraviolet light source 26.
By irradiating the ultraviolet ray from (right) as well, the uniformity of the intensity of the ultraviolet ray irradiation of each part is enhanced. In the distribution of the intensity of ultraviolet rays in the y direction, the distance between the tip portion of the light guide fiber 26 and the elliptical hole 14 is larger than the major axis of the elliptical hole 14,
It is sufficiently uniform.

Considering the strength of the ultraviolet rays 27 in the z direction, the closer to the outer surface of the photodetector holding plate 13, the stronger the strength is.
The weaker it gets to the side. However, in this embodiment, since the case 9 made of aluminum die casting is used, the ultraviolet rays 27 emitted from the tip of the light guide fiber 26 are reflected by the mounting surface 21, and the ultraviolet rays on the inner side of the adhesive 16 are reflected. Increase the strength of. As a result, it is possible to reduce the deviation of the curing timing of the adhesive 16 and suppress the generation of residual stress. Further, since the ultraviolet rays are reflected also by the projections 15, the ultraviolet rays 27 are reflected on the shaded portion of the photodetector holding plate 13.
Can also be irradiated. When the case 9 is made of resin instead of metal such as aluminum, a material in which a filler that enhances the reflectance of ultraviolet rays is mixed with the resin is used, or a material having high reflectance of ultraviolet rays is applied to the surface of the resin. Alternatively, the same effect as described above can be obtained by plating a metal. As described above, according to the present embodiment, by irradiating the ultraviolet light 27 from the outer surface side of the photodetector holding plate 13, it is substantially uniform from the part near the outer surface of the photodetector holding plate 13 to the part on the case 9 side. Since the adhesive 16 can be hardened, the work of hardening the adhesive can be facilitated.

After the adhesive 16 is cured and cooled,
The holding arm 24 is removed from the photodetector holding plate 13, and the work of attaching the photodetector holding plate 13 to the case 9 is completed.

Although the elliptical hole 14 is formed in the photodetector holding plate 13 in the above-described embodiment, the same effect as above can be obtained when the elongated hole is formed instead of this structure. You can

Next, as a second embodiment of the present invention, an embodiment in which a notch is formed in the photodetector holding plate 13 will be described with reference to FIG. FIG. 5 is an explanatory diagram showing the configuration of the photodetector fixing portion of the optical head according to the second embodiment.

As is apparent from FIG. 5, the optical head of this example is characterized in that the notch 17 is formed in the photodetector holding plate 13. The notch 17 is formed in a U shape having a width larger than the depth. Since the other parts are the same as those of the optical head according to the first embodiment, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

The optical head of this example has the same effect as the optical head according to the first embodiment, and it is also possible to irradiate ultraviolet rays, which are adhesive curing light, from the side of the photodetector holding plate 13. Therefore, the adhesive 16 can be more uniformly cured, and the work can be speeded up and the optical head, which is a product, can be stabilized over time.

In each of the above embodiments, the case where the case 9 and the photodetector holding plate 13 in the optical head are connected and fixed has been described, but the gist of the present invention is not limited to this. Connection fixing of the imaging lens side block and the solid-state image sensor side block in the image pickup device, etc.
It can be applied to connection and fixing of arbitrary members.

[0039]

As described above, according to the present invention,
By inserting the projection provided on the case into the hole or notch provided on the holding plate, it is possible to easily perform three-dimensional adjustment of the holding plate with respect to the case, and to perform connection and fixation between members with high accuracy. You can In addition, the tip of the protrusion inserted in the hole or notch is projected from the outer surface of the holding plate,
Since at least the portion including the tip of the projected protrusion and the outer surface of the holding plate is connected and fixed via the adhesive, it is sufficient to supply the adhesive and irradiate the curing light only from the protruding side of the protrusion. Therefore, it is easy to supply the adhesive to the required portions and irradiate the curing light, and it is possible to highly efficiently connect and fix the members. Furthermore, since the adhesive can be uniformly cured by irradiating the curing light from one direction, it is possible to prevent the position shift of the cured member. Therefore, it is possible to provide an optical head that is small in size, high in performance, and excellent in reliability and durability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an optical head according to an exemplary embodiment.

FIG. 2 is a perspective view showing an arrangement and optical paths of optical components provided in the optical head according to the embodiment.

FIG. 3 is an explanatory diagram showing a configuration of a photodetector fixing portion of the optical head according to the first embodiment.

FIG. 4 is an explanatory diagram illustrating a method for adjusting a photodetector holding plate and a method for irradiating adhesive curing light according to an embodiment.

FIG. 5 is an explanatory diagram showing a configuration of a photodetector fixing portion of the optical head according to the second embodiment.

FIG. 6 is a perspective view showing a configuration of an optical head according to a conventional example.

[Explanation of symbols]

1 Semiconductor laser 2 Polarizing beam splitter 3 Collimating lens 4 mirror 6 Objective lens 7 Photodetector 8 optical disks 9 cases 10 laser light 13 Detector holding plate 14 Elliptical hole 15 protrusions 16 Adhesive (UV curable adhesive) 21 Mounting surface 22 clearance 24 holding arm 25 Light source (ultraviolet light source) 26 Light guide fiber 27 Adhesive curing light (ultraviolet)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Rissho Kamisada             1410 Inada Stock Company, Hitachinaka City, Ibaraki Prefecture             Hitachi, Ltd. Digital Media Products Division             Within F term (reference) 5D117 AA02 CC07 HH10 KK01 KK23                 5D119 AA38 BA01 KA40 KA42 NA06                 5D789 AA38 BA01 KA40 KA42 NA06

Claims (6)

[Claims] 1. A projection having a first member provided with a hole or notch and a second member provided with a protrusion insertable in the hole or notch, wherein the protrusion is provided in the hole or notch. In a connecting and fixing structure of a member for connecting and fixing the first member and the second member via an adhesive in a state in which is inserted, the tip end portion of the protrusion inserted into the hole or notch is A connecting and fixing structure for a member, which projects from an outer surface of one member, and connects and fixes at least a portion including a tip portion of the projected protrusion and an outer surface of the first member via the adhesive. 2. The member connecting and fixing structure according to claim 1, wherein the hole is an elongated hole or an elliptical hole, and the notch is a groove-shaped notch having a width larger than a depth. 3. The inner surface of the hole or notch and the outer surface of the protrusion, and also between the second member facing surface of the first member and the first member mounting surface of the second member. 3. The structure for connecting and fixing members according to claim 1 or 2, wherein the structure is filled with an adhesive. 4. The second member according to claim 1, wherein at least the mounting surface of the first member is made of a material having a high reflectance of adhesive curing light. A structure for connecting and fixing the described members. 5. The structure for connecting and fixing members according to claim 1, wherein at least the first member mounting surface of the second member is made of aluminum die cast. . 6. A light source, an objective lens for converging laser light emitted from the light source on a recording film surface of an optical disc, a photodetector for detecting reflected light reflected by the recording film surface of the optical disc, and a light. In an optical head including a holding plate that holds a detector and a case that integrally holds each of these members, a hole or notch is provided in the holding plate, and a hole provided in the holding plate in the case. Alternatively, a protrusion that can be inserted into the notch is provided, and the tip of the protrusion inserted into the hole or the notch is projected from the outer surface of the holding plate,
An optical head, characterized in that at least a portion including a tip portion of the projected protrusion and an outer surface of the holding plate is connected and fixed via an adhesive.