JP2002182103A - Resin molded optical component and optical pickup device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting accuracy of a resin molded optical component equipped with an optical function surface such as for reflection so that the optical component has a high optical function, and to facilitate the mounting of the optical component. SOLUTION: A base body part 12 and a flat plate part 14 having an optical function surface 14a supported by the base body part 12 are molded integrally, and a mounting surface part 12b which can be mounted on a carriage 3 is formed on the base body part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-molded optical component, and more particularly, to a resin-molded optical component optimal as a reflection mirror used for an optical pickup of a disk drive, and an optical pickup device having the same.

[0002]

2. Description of the Related Art Generally, an optical pickup focuses laser light emitted from a semiconductor laser on an optical disk surface through a collimator lens, a rising mirror, and an objective lens.
The return light reflected from the optical disk surface is passed through the original optical system, and the recorded information recorded on the optical disk surface is read by a photodiode to reproduce the recorded information.

FIG. 17 shows a conventional optical pickup 101 of this type. The optical pickup 101 emits a laser beam through a lens actuator 115 having an objective lens 22 mounted on a carriage 124 made of sheet metal and a rising mirror 120 to the objective lens 22, and returns light from the objective lens 22. And a light projecting / receiving unit 118 for receiving the light.

The carriage 124 has a bottom plate 126a,
It is composed of side wall portions 126b and 126c which are provided to face each other along both longitudinal edges of the bottom plate portion 126a. An opening 136 having a substantially square shape is formed substantially at the center of the bottom plate portion 126a. The opening 136 includes a pair of cut-and-raised pieces 138a that are opposed to each other.
138b are formed.

[0005] Adjacent to the opening 136, the bottom plate 126a
The cut-and-raised piece 139
a and 139b are formed. Collimator lens 14
5 is sandwiched between the cut-and-raised pieces 139a and 139b, and an adhesive is injected into the gap and the groove 139c to be attached and fixed.

The rising mirror 120 is formed by depositing a metal film on a reflecting surface of a glass or resin member having a rectangular plate shape, and is mounted so as to be sandwiched between cut and raised pieces 138a and 138b.

Next, the rising mirror 120 is moved to the carriage 1.
The method of assembling the H.24 will be described. First, the rising mirror 120 is mounted on a mounting portion provided as a mounting reference surface provided on a jig (not shown), and the rising mirror 120 is positioned with respect to the cut-and-raised pieces 138a and 138b. While the mirror 120 is held at about 45 degrees, an adhesive such as an ultraviolet curing type is injected and filled into a gap between each of the cut-and-raised pieces 138a and 138b and the rising mirror 120 and irradiated with ultraviolet rays to bond in the air. Fix with.

[0008] The optical pickup 101 which is completely assembled.
In, the laser light emitted from the light emitting and receiving unit 118 is converted into parallel light by the collimator lens 145, rises at a substantially right angle through the rising mirror 120, and enters the objective lens 22. Then, the laser light emitted from the objective lens 22 is condensed on an optical disk surface (not shown), and a return light corresponding to information recorded on the optical disk is generated.
This return light enters the light emitting and receiving unit 118 through the same optical path, and reproduces the recorded information recorded on the optical disk. The carriage 124 of the optical pickup 101 is controlled in accordance with the return light from the optical disk, and is movably supported at a predetermined position of the optical disk device.

Next, another embodiment of the prior art will be described with reference to FIGS. 18A and 18B.
A glass triangular prism 150 is used in place of 20. The bottom plate 126a of the carriage 124
The triangular prism 150 is mounted on the
After the position adjustment is performed so that the rise of the laser beam to the objective lens 22 (see FIG. 15) at 0 is a predetermined position, the adhesive 100 is applied to the outer peripheral edge of the mounting surface of the triangular prism 150. Then, the adhesive 100 is irradiated with ultraviolet rays to be cured and adhered and fixed. Thus, the triangular prism 15
0, the reflection surface 15 of the triangular prism 150 is used.
0a is formed at about 45 degrees with respect to the bottom surface, which is the mounting surface, so that the triangular prism 150 can be directly attached to the bottom plate portion 126a of the carriage 124 of the optical pickup without adjusting the angle of the reflection surface by the above-described jig. The angle can be adjusted simply by bonding.

[0010]

As described above, when the rising mirror 120 is air-bonded between the cut-and-raised pieces 138a and 138b of the bottom plate portion 126a of the carriage 124, the angle including the angle is determined by using a jig. Positioning adjustments have to be made, and simplification of assembly has been required. When the triangular prism 150 is bonded and fixed to the bottom plate portion 126a, the conventional triangular prism 150 made of glass is used.
However, since it is expensive, a resin-made product can be manufactured by injection molding using an injection molding machine (not shown) instead. However, the triangular prism 1 made of resin
In 50, since the thick portion of the reflecting surface is thicker at the center and thinner at the outer edge, when the molding resin softened by the injection molding gradually cures, distortion due to shrinkage occurs and the reflecting surface is deformed. There is a problem that it is difficult to accurately form flatness.

In recent years, it has been required to reduce the thickness of the optical pickup 101 and the entire disk device on which the optical pickup 101 is mounted. However, since the lower edge of the triangular prism 150 needs a portion to which the adhesive 100 is applied, the lower end of the effective diameter of the laser beam is set to the bottom plate 126 of the carriage 124.
The position of the optical pickup is higher than a, and the optical pickup and the like cannot be reduced in thickness in order to maintain a predetermined optical axis of laser light incident on the reflection surface and an optical function such as an effective diameter.

Further, when the position of the rising mirror is adjusted and determined so that the laser beam reflected by the rising mirror 120 passes through the center of the objective lens 22, the rotation direction and the inclination angle are liable to change. It was difficult to hold and adjust the position.

SUMMARY OF THE INVENTION An object of the present invention is to increase the mounting accuracy and facilitate the mounting of a resin molded optical component having an optical function surface such as reflection so as to have a high optical function.

Another object of the present invention is to provide a mounting structure for a resin molded optical component which can be reduced in thickness of the entire optical pickup.

Another object of the present invention is to provide a resin-molded optical component mounting structure that facilitates position adjustment in the direction along the optical axis when mounting the resin-molded component.

[0016]

At least one of the above objects is attained.
As a first solution to solve the above problem, a flat plate portion having an optical function surface and a base portion holding the flat plate portion at a predetermined angle are resin-molded, and the base portion can be attached to an attached portion. Mounting surface is formed.

Further, as a second solution, a resin molded optical component integrally provided with a flat plate portion having an optical function surface and a base portion holding the flat plate portion at a predetermined angle is mounted on an optical pickup. In the mounting structure, a mounting surface portion that can be mounted on a carriage forming an optical pickup is formed on the base portion, and the flat plate portion is a reflection mirror and is held at an angle of 45 degrees with respect to the mounting surface of the mounting surface portion. Then, the laser beam emitted from the laser diode is reflected in a direction orthogonal to the disk surface of the optical disk.

As a third solution, the base is formed continuously with the lower end of the reflection mirror.

As a fourth solution, the reflecting mirror is formed in a square shape, and the carriage supports an objective lens, and is equipped with an actuator section for moving the objective lens in a predetermined direction. The mirror is disposed below the objective lens, and the upper end corner of the reflection mirror is cut off.

As a fifth solution, the position of the gate at the time of resin molding is provided on the tip end surface of either the reflecting mirror or the base.

As a sixth solution, an opening is formed in the bottom surface of the carriage, the base is connected to the upper end of the flat plate, and the lower end of the flat plate is inserted into the opening. Things.

As a seventh solution, the mounting surface of the base is formed wider than the flat plate.

As an eighth solution, an engaging portion and an engaging receiving portion are provided between the base portion and the carriage so as to be mutually engageable. The base portion slides only in a direction along the axis so that the position can be adjusted.

[0024] As a ninth solution means, the engaging portion comprises:
At least one pair of protrusions protruding from the mounting surface and being parallel to each other, and the engagement receiving portion is engaged with the protrusion and serves as a guide hole formed in the carriage.

As a tenth solution, the engaging portion is at least a pair of parallel guide holes formed in the mounting surface portion, and the engagement receiving portion is engaged with the guide hole to allow the carriage to move from the carriage. It is a projecting projection.

As an eleventh solution, a resin molded optical component integrally provided with a flat plate having an optical function surface and a base for holding the flat plate at a predetermined angle is mounted on an optical pickup. A mounting structure, wherein a mounting surface portion that can be mounted on the mounted portion is formed on the base portion, and the flat plate portion is a reflection mirror and is held at an angle of 45 degrees with respect to the mounting surface of the mounting surface portion. A laser beam emitted from the diode is reflected in a direction orthogonal to the disk surface of the optical disk, and an mutually engageable engaging portion and an engaging receiving portion are provided between the base portion and the mounted portion. ,
The base is slid only in the direction along the optical axis of the laser light incident on the reflection mirror, and the position can be adjusted.

Further, as a twelfth solution, an actuator base, which is a portion to be mounted, and a lens actuator for drivingly supporting an objective lens are provided on the actuator base, and the engaging portions are mutually protruding from the mounting surface. At least one pair of parallel projections, and the engagement receiving part is at least one pair of parallel guide holes formed in the actuator base.

As a thirteenth solution, an actuator base, which is a part to be mounted, and a lens actuator for drivingably supporting an objective lens are provided on the actuator base, and the engaging part is formed in the mounting surface part. At least one pair of guide holes parallel to each other,
This is a projection projecting from the actuator base.

As a fourteenth solution, a rack is formed on the side wall of the base portion, a jig insertion hole is formed on the bottom surface of the mounting portion close to the rack, and a pinion is formed in the jig insertion hole. The pinion is rotatably arranged by inserting a part of a jig provided with the pinion, and the pinion is engaged with a rack to slide the base portion.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A reflection mirror (resin-molded optical component) according to a first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the optical pickup 1 includes a carriage 3 whose main body is made of sheet metal, and the carriage 3 has a bottom plate 3a and side walls disposed opposite to each other along both longitudinal edges of the bottom plate 3a. (Not shown). On the bottom plate portion 3a of the carriage 3, a light emitting / receiving section 5 having a laser diode and a photodiode, a collimator lens 7, a reflection mirror 10, and an actuator 11 are mounted.

As shown in FIG. 2, the reflection mirror 10 is composed of an optical component formed by integrally molding a kind of resin, and includes a base portion 12 and an optical function portion 14 supported by the base portion 12. The base portion 12 is formed of a rectangular flat plate, and includes an upper surface portion 12a and a bottom surface portion (mounting surface portion) 12b opposed thereto. In addition, the bottom surface part 12b
The mounting reference plane L is used for mounting on the bottom plate 3a of the carriage 3, which is the mounting target. In addition, a gate portion 12d is provided on the tip end surface 12c of the base portion 12 as an injection point when the metal mold is injected and filled during resin molding.

The optical function part 14 is provided on the upper surface 1 of the base 12.
A flat plate portion (parallel flat plate portion) 14g which is integrally provided at an inclination angle of about 45 degrees upward from one edge portion of the base portion 2a and has a wide rectangular shape in the longitudinal direction of the base portion 12 and has a parallel and uniform thickness. Have. That is, the flat plate portion 14g is at an angle of 45 degrees to the mounting reference plane L of the base portion 12. A dielectric multilayer film composed of SiO ₂ , AlO ₂ , TiO ₂ and some combination thereof is formed on the upper surface of the flat plate portion 14g, and the laser light S1 and the return light S2 shown in FIG. Is a reflection surface (mirror surface) 14a that reflects the light. The reflection surface 14a of the reflection mirror 10 is mounted on the bottom plate portion 3a of the carriage 3 in a state where the reflection surface 14a is disposed immediately below and opposed to the center (the optical axis) of the objective lens 22 so that the center portion thereof coincides with the center. (See FIG. 1).

Next, a method of manufacturing and assembling the reflection mirror 10 will be described with reference to FIG. First, the molded resin member that has been heated to a soft state is injected and filled into a mold by an injection molding machine (not shown), and a prototype of the reflection mirror 10 having a desired shape is formed by injection molding. Next, a reflective surface 14a is formed by laminating a dielectric multilayer film on the surface of the flat plate portion 14g of the reflective mirror 10 by an evaporation apparatus or the like, and the reflective mirror 10 including the base portion 12 is completed.
At this time, since the optical function unit 14 has a flat plate shape with a uniform thickness, the stress applied to the resin at the time of curing the resin becomes the same, and distortion due to shrinkage at this time is small. Further, since the gate position of the resin molding is located at the tip end surface of the base portion 12, the resin flow pressure at the time of resin molding in the optical function portion 14 can be kept constant, so that distortion due to shrinkage is less and the reflection surface 14a which is the optical function surface Can be formed with higher accuracy.

Next, as shown in FIG.
Is mounted on the carriage 3 together with other components (the light emitting / receiving section 5, the collimator lens 7, and the actuator 11).
Then, an adhesive 100 is prepared for attaching and fixing the reflection mirror 10 to the carriage 3. As the adhesive 100, an ultraviolet curable adhesive or the like is used. The adhesive may be an epoxy-based adhesive other than the ultraviolet curable type, and in this case, the adhesive can be fixed without irradiating ultraviolet rays.

Next, the base portion 12 of the reflecting mirror 10 is mounted on a predetermined portion of the bottom plate portion 3a of the carriage 3, and the reflecting surface 1 of the optical function portion 14 is mounted on the collimator lens 7 which is mounted and fixed in advance.
4a are arranged so as to face each other. At the same time, the laser beam emitted from the light emitting and receiving unit 5 and incident from the collimator lens 7 is incident on the objective lens 22 of the actuator 11 on which the reflecting surface 14a of the optical function unit 14 is attached in advance so that the laser beam is incident on the objective lens 22 (see FIG. (1 left / right direction) to adjust the positioning and assemble.

After the base portion 12 of the reflection mirror 10 is mounted on the bottom plate portion 3a of the carriage 3 and adjusted in position as described above, the base portion 12 of the reflection mirror 10 is held in a state where these mounting positions are not shifted. UV-curable adhesive is applied to the substrate and fixed by curing by UV irradiation.

By assembling as described above, the angle of the optical function unit 14 of the reflecting mirror 10 with respect to the optical axis of the laser beam S1 emitted from the light emitting / receiving unit 5 does not change with respect to the mounting surface of the reflecting surface 14a. Since the angle accuracy of the reflecting surface 14a with respect to the mounting reference plane L has already been obtained, the laser light can always be started at the same angle, thereby facilitating assembly. By forming a hole (not shown) for inserting an adhesive penetrating from the upper surface portion 12a to the bottom surface portion 12b of the base portion 12, the reflection mirror 10 may be more firmly attached and fixed to the carriage 3. . In addition, by using a material that transmits ultraviolet light well as the molding resin of the rising mirror 10, the adhesive can be evenly irradiated with ultraviolet light and can be reliably cured. In this manner, the adhesive is applied and fixed to the bottom surface (mounting surface) 12b and the like, so that the lower end of the optical function unit 14 is connected to one end of the base unit 12, so that a space is formed, and the adhesive is cured. Even if distortion occurs, no problem occurs in the direct optical function.

As shown in FIG. 2, the reflecting mirror 10 thus constructed and assembled is moved from the collimator lens 7 to the optical function part 14 in parallel with the contact surface 12b of the base part 12.
Is reflected by the reflection surface (mirror surface) 14a, rises in a substantially vertical direction, and enters the objective lens 22. Then, the return light S2 enters the optical function unit 14 from the objective lens 22, is deflected in the horizontal direction, and enters the collimator lens 7 and the light emitting / receiving unit 5. Then, information recorded on the surface of the optical disk 16 is read and reproduced by the light emitting / receiving unit 5.

Next, a first modification of the reflection mirror 10 according to the first embodiment of the present invention will be described with reference to FIG.
The reflection mirror 30 according to the first modification includes a reinforcing portion 30a provided on the end face of a continuous connection portion between the base portion 12 and the optical function portion 14 with the reflection surface 14a formed in a flat plate shape and maintaining the optical function. Are provided integrally. Therefore, when the reflection mirror 30 which is a small optical component is handled, the continuous connecting portion between the base portion 12 and the optical function portion 14 is reinforced, so that it is not broken or distorted at the time of assembling work. The influence (deterioration) can be reduced.

Next, a second modification of the reflection mirror 10 according to the first embodiment of the present invention will be described with reference to FIG.
The reflection mirror 40 according to the second modification is characterized in that a substantially triangular-shaped locking portion 40a for continuously connecting the respective end faces of the base portion 12 and the optical function portion 14 is provided by integral molding. . Therefore, the reflection surface 14a used for the incidence and emission of the laser beam is a flat plate, and the other portions are the reinforcing members of the same as the reinforcing portion 30a. Since the connecting portion 40a is provided on the reflecting mirror 40 in this manner, the continuous connecting portion between the base portion 12 and the optical function portion 14 is further reinforced, so that the connecting portion 40a does not break or be distorted during the assembling work. The influence (deterioration) on the optical function can be reduced.

Next, a third modification of the reflection mirror 10 according to the first embodiment of the present invention will be described with reference to FIG.
The reflection mirror 50 according to the third modification is different from the above-described locking portion 40.
By forming a triangular hole portion 51 by hollowing out the center of a, a locking portion 50a is formed in which both ends of each of the distal end portions of the base portion 12 and the flat plate portion 14g are integrally formed. Therefore, during the assembling operation, the inclination angle of the reflecting surface 14a with respect to the base portion 12 is always reliably maintained at 45 degrees, so that it is simply mounted on the carriage 3 and easily mounted and fixed so that the light is reflected at a predetermined angle. Can be.

Next, a fourth modification of the reflection mirror 10 according to the first embodiment of the present invention will be described below with reference to FIG. The reflecting mirror 60 according to the fourth modification has the same structure as the above-described reflecting mirror 10, but is formed by cutting a corner of the upper end of the flat plate portion 14g into an arc shape. By cutting and rounding the corners in this manner, the objective lens 22 is cut.
When the lens holder (see FIG. 16) holding the lens holder moves in the tracking direction (radial direction of the optical disk 16), it is possible to prevent a part of the lens holder from hitting the reflection mirror 60. Even if the optical pickup 1 is thinned, the lens holder can be prevented from hitting the reflection mirror 60.

Next, a mounting structure of a reflection mirror (resin molded optical component) according to a second embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 7, the optical pickup 71 has a main body composed of a carriage 3 made of sheet metal, and a bottom plate 3a having a rectangular opening 4 in the carriage 3 and two longitudinal edges of the bottom plate 3a. Along with side wall portions (not shown) which are arranged to face each other. The bottom plate 3a of the carriage 3 includes
The light emitting and receiving unit 5 including a laser diode and a photodiode, the collimator lens 7, the reflection mirror 80, and the actuator 85 are mounted.

As shown in FIGS. 8 and 9, the reflection mirror 80 is made of an optical component formed of a kind of resin, and includes a base 82 and an optical function unit 84 supported by the base 82.
And The base 82 is formed of a rectangular flat plate, and includes an upper surface 82a and a bottom surface (mounting surface) 82b opposed thereto. Then, two through holes (filling portions) 8 penetrate the upper surface portion 82a and the lower surface portion 82b.
2f is formed. Further, a concave portion 82c (see FIG. 14) formed in a concave shape is formed in the central portion of the bottom surface portion 82b, and the through hole 82f is inserted into and connected to the concave portion 82c. The concave portion 82 of the bottom portion 82b
The periphery of c is an attachment reference plane L2 when the carriage 3 is attached to the attached portion.

The optical function part 84 is provided on the upper surface part 8 of the base part 82.
A supporting portion 84f projecting upward from the edge portion 2a and having a wide rectangular shape in the longitudinal direction thereof; and a flat plate portion provided integrally with the tip of the supporting portion 84f and inclined with respect to the bottom surface portion 82b of the base portion 82. 84 g. The flat plate portion 84g of the reflection mirror 80 is integrally formed so that its base end portion 84j is continuously connected to the support portion 84f. 84g flat plate
A dielectric multilayer film made of SiO ₂ , AlO ₂ , TiO _2, and some combination thereof is formed on the upper surface of the substrate, and reflects the laser beam S1 and its return beam S2 (see FIG. 7). Reflecting surface (mirror surface) 84a.

The tip 8 of the flat plate portion 84g of the reflection mirror 80
4k is cut at an acute angle with respect to the upper surface portion 82a and is a free end. And this flat plate part 84g
The base 82 of the reflection mirror 80 is mounted on the bottom plate 3a of the carriage 3 so that the tip 84k of the mirror 3 is located in the opening 4 (see FIG. 9). Here, the front end portion 84k of the flat plate portion 84g is cut as described above, and the carriage 3 is cut.
A gap is provided between the bottom plate 3a and the bottom plate 3a.

The actuator 85 includes the objective lens 2
A lens actuator (actuator portion) 89 (see FIG. 16) for movably supporting the lens 2 is provided. The lens actuator 89 includes a fixed portion erected on the bottom plate 3a of the carriage 3, a lens holder for holding the objective lens 22, four wires connecting the fixed portion and the lens holder, and a lens holder. And an electromagnetic drive mechanism for driving in the direction. Then, so that the objective lens 22 is located directly above the flat plate portion 84g of the reflection mirror 80,
The actuator 85 is attached and fixed to the bottom plate 3a of the carriage 3.

Next, the adjustment of the mounting position of the reflection mirror 80 of the optical pickup 71 will be described with reference to FIG. First, the reflection mirror 80 is prepared, and other components (the light emitting / receiving unit 6, the collimator lens 7, and the lens actuator 89) are provided.
At the same time, it is mounted on the bottom plate 3a of the carriage 3.

Next, the bottom surface portion 82b of the base portion 82 of the reflection mirror 80 is placed on or near the peripheral portion facing the opening 4 of the bottom plate portion 3a, and the reflection of the optical function portion 84 is performed on the collimator lens 7 previously mounted and fixed. It arrange | positions so that the surface 84a may oppose. Further, the reflecting surface 84a of the reflecting mirror 80 is opposed to the objective lens 22 supported by a lens actuator 89 to which the reflecting surface 84a is attached and fixed in advance. Insert 84k. In this way, the positioning is adjusted by moving the bottom plate 3a in the front-rear direction (the left-right direction in FIG. 7). Here, with respect to the optical axis of the laser beam S1 emitted from the light emitting and receiving unit 5, the optical function unit 84 of the reflecting mirror 80 moves the mounting surface L2 of the reflecting surface 84a even if it moves in the front-back direction.
, The laser beam S1 can always rise in the vertical direction at the same angle, and the accuracy of the angle of the reflection surface 84a can be easily obtained.

After the bottom surface portion 82b of the reflection mirror 80 is brought into contact with the bottom plate portion 3a of the carriage 3 to adjust the position, the mounting position of the base portion 82 of the reflection mirror 80 is maintained in such a manner that the mounting positions are not shifted. An ultraviolet curing adhesive (not shown) is injected from the through hole 82f. Base part 8
The second concave portion 82c is filled with an adhesive, and then irradiated with ultraviolet rays, and the reflecting mirror 80 is attached and fixed to the bottom plate 3a of the carriage 3. The molding resin of the reflection mirror 80 includes
If a material that allows ultraviolet light to pass through is used, the adhesive can be evenly irradiated with ultraviolet light and can be reliably cured.

The reflecting mirror 80 constructed and assembled as described above uses the reflecting surface 80a of the reflecting mirror 80 similarly to the above-described reflecting mirror 10 to cause the laser beam S1 incident from the horizontal direction.
In the vertical direction, and conversely, the laser light (return light) S2 incident from the vertical direction is made to enter and exit in the horizontal direction. Thus,
An optical system including the reflection mirror 80 and the actuator 85 of the optical pickup 71 is completed. Then, the reflection mirror 80
Since the lower end of the reflection surface 80a is disposed in the opening 4,
The optical axis of the laser light emitted from the laser diode of the light emitting and receiving unit 5 can be made closer to the bottom plate 3a of the carriage 3, and the thickness of the optical pickup 71 can be reduced.

Next, a first modification of the reflection mirror 80 according to the second embodiment of the present invention will be described below with reference to FIGS. The first modification is characterized in that a projection is provided on the reflection mirror 90, a guide hole is provided on the carriage 3, and the mounting position is adjusted while the projection is engaged with the guide hole. I do. First, a pair of rectangular guide holes 3c parallel to each other are formed in the bottom plate 3a of the carriage 3 adjacent to the opening 4. Each guide hole 3 c has a shape that is long in the direction of the opening 4. Also, a jig insertion hole 95 for inserting a part of a jig (not shown) is formed in the bottom plate portion 3a near the long edge of the guide hole 3c.

The reflection mirror 90 is made of an optical component formed of a kind of resin, and includes a base portion 92 and an optical function portion 84 supported by the base portion 92. Note that the optical function unit 84 has been described above, and the same reference numerals are given and the detailed description is omitted.

The base portion 92 is formed of a rectangular flat plate, and has an upper surface portion 92a and a bottom surface portion (mounting surface portion) 92b opposed thereto. Two through holes 82f are formed so as to penetrate the upper surface portion 92a and the lower surface portion 92b. A concave portion 82c is formed in the central portion of the bottom surface portion 92b.
A through hole 82f is inserted into and connected to the inside. Further, a pair of parallel elongated protrusions 92f protruding from both sides in the longitudinal direction of the concave portion 82c are formed on the bottom surface portion 92b. These projections 92f are adapted to engage in the respective guide holes 3c, and have a size shorter than the respective guide holes 3c. In addition, the protrusion 92f of the bottom surface 92b.
The portion excluding is a mounting reference plane L3 when mounting to the carriage 3, which is one of the mounted portions (see FIG. 10).

On the side wall of the base portion 92 of the reflection mirror 90,
A rack 94 having a flat plate with lattice-like teeth is formed. Then, a pinion 200 is provided in a jig (not shown),
The pinion 200 is engaged with the rack 94, the rotation shaft is inserted into the jig insertion hole 95, the pinion 200 is rotated, and the reflection mirror 90 on which the rack 94 is formed is slid.

Next, adjustment of the mounting position of the reflection mirror 90 will be described with reference to FIGS. First, the reflection mirror 90 is prepared, the base portion 92 of the reflection mirror 90 is mounted on the bottom plate 3a of the carriage 3, and each guide hole 3c and each projection 92f are engaged.

By engaging the projection 92f with each guide hole 3c, the reflecting surface 84a of the optical function part 84 faces the collimator lens 7 previously mounted and fixed, and further, the lens actuator 89 of the actuator 85 previously mounted and fixed. Is located below the objective lens 22 supported by the camera.

Next, the rotating shaft of the pinion 200 is inserted into the jig insertion hole 95 while the pinion 200 of the jig is engaged with the rack 94 of the reflection mirror 90 on the bottom plate 3 a of the carriage 3. Then, the pinion 200 is rotated to move the base portion 92 of the reflection mirror 90 in the front-rear direction (the left-right direction in FIGS. 10 and 11) via the rack 94. The base portion 92 of the reflection mirror 90 is configured such that the projection 92f is regulated by the guide hole 3c so that the laser light emitted from the laser diode of the light emitting / receiving section 5 and incident from the collimator lens 7 is emitted to the center of the objective lens 22. Then, the base portion 92 is slid on the bottom plate portion 3a of the carriage 3 only in the direction along the optical axis of the laser light incident on the reflection surface 84a of the reflection mirror 90 to adjust the position.

After the bottom surface portion 92b of the reflection mirror 90 is brought into contact with the bottom plate portion 3a of the carriage 3 to adjust the position, the base portion 92 of the reflection mirror 90 is held in a state where these mounting positions are not shifted. The ultraviolet curable adhesive 100 is injected from each of the through holes 82f. The adhesive is filled in the concave portion 82c of the bottom surface (mounting surface) 92b, and the adhesive is irradiated with ultraviolet rays to be cured, and the reflection mirror 90 is mounted and fixed to the carriage 3.

The angle of the optical function part 84 of the reflection mirror 90 with respect to the optical axis of the laser beam S1 emitted from the light emitting and receiving part 5 does not change even if the optical function part 84 of the reflection mirror 90 moves in the front-back direction. Since the laser beam can always be started at the same angle, assembly becomes easy. Further, the adhesive is inserted into the through hole 82f of the bottom portion (mounting surface) 92b of the base portion 92, and the concave portion 82c serves as an adhesive pool for the adhesive, and is inward from the outer peripheral edge of the bottom portion (mounting surface) 92b. And is attached at the bottom surface portion 92b of the base portion 92, so that the adhesive strength at the central portion is strengthened and can be made strong. Further, the projection 9 of the reflection mirror 90 is inserted into the guide hole 3 c of the carriage 3.
By injecting and filling the adhesive with the 2f attached, the reflection mirror 90 can be more firmly fitted to the carriage 3.

The reflecting mirror 90 constructed and assembled as described above is moved from the collimator lens 7 to the optical function portion 84 in parallel with the mounting surface portion 92b of the base portion 92, as in FIG.
Is reflected by the reflection surface (mirror surface) 84a, rises in a substantially vertical direction, and enters the objective lens 22. Then, the return light S2 is incident on the reflection surface 84a of the optical function unit 84 from the objective lens 22, is deflected in the horizontal direction, and is incident on the collimator lens 7 and the photodiode of the light emitting / receiving unit 5. Then, information recorded on the surface of the optical disk 16 is read and reproduced by the light emitting / receiving unit 5.

Next, a second modification of the reflection mirror 90 will be described with reference to FIG. In the second modified example, an actuator 85 is used instead of the bottom plate 3a of the carriage 3.
The reflection mirror 90 is mounted on the actuator base 99 by adjusting the position thereof. Therefore, the opening 4 is not required in the bottom plate 3a of the carriage 3.

As shown in FIG. 16, the actuator 85
Is composed of an actuator base 99 having a flat plate shape, and a lens actuator (actuator section) 89 which is integrally mounted on the actuator base 99 and movably supports the objective lens 22.

Actuator base 99 made of resin
Has an upper surface portion 99a and a bottom surface portion (mounting surface portion) 99b opposed thereto. An opening (not shown) having a rectangular shape is formed in the actuator base 99 so as to penetrate the upper surface portion 99a and the bottom surface portion 99b. The bottom surface 99b of the actuator base 99
Is a mounting reference surface when mounting together with the bottom plate 3a of the carriage 3.

The lens actuator 15 holds, on a rectangular actuator base 99 made of resin, a fixed portion 17 which is formed upright so as to be integral with the upper surface portion 99a of the actuator base 99, and the objective lens 22. Lens holder 19, fixing part 17 and lens holder 19
And an electromagnetic drive mechanism 20 for driving the lens holder 19 in a predetermined direction.

A mounting portion 17f is formed on each side wall of the fixing portion 17. The fixing portion 17 is provided integrally with the actuator base 99 at a predetermined interval.

The lens holder 19 comprises a cylindrical lens holding portion 19a and a rectangular yoke holding portion 19b integrally formed with a part of the lens holding portion 19a. An objective lens 22 is supported. Then, the yoke holder 1 of the lens holder 19a
A mounting portion 19f is formed on each side wall of 9b.

Each wire 18 is made of an extremely fine metal wire of about several tens of μm, one end of which is engaged with each mounting portion 19 f of the lens holder 19, and the other end of which is mounted on the fixing portion 17. It is engaged with the portion 17f. And the mounting part 17f
Each of the groove portions of the mounting portion 19f is filled with an ultraviolet-curable adhesive 100, and the ends of the wires 18 are fixed by irradiating ultraviolet rays. In this way, the lens holder 19 holds the two
It is movably supported and movable in the axial direction (tracking direction and focusing direction).

The electromagnetic drive mechanism 20 includes a ring-shaped yoke 28 made of a metallic magnetic material attached to the lens holder 19.
And a magnet 29 mounted along the inner wall of the yoke 28
And a coil unit 30 (a focusing coil and a tracking coil) attached to the actuator base 99 so as to face the magnet 29 and intersect with the yoke 28, and has one magnetic circuit.

The actuator 85 thus configured
An actuator base 99 having an opening and a pair of guide holes 99f and a fixed portion 17 are integrally formed by injection molding with an injection molding machine (not shown).

The adjustment of the mounting position of the reflection mirror 90 on the actuator base 99 is almost the same as the adjustment of the mounting position of the reflection mirror 90 on the bottom plate 3a of the carriage 3. At this time, since the reflecting mirror 90 is directly attached to the actuator base 99, the alignment between the reflecting surface 84a of the reflecting mirror 90 and the center of the objective lens 22 can be ensured. By assembling the actuator 85 and the reflection mirror 90 before mounting them on the bottom plate 3a of the carriage 3, the assembling can be facilitated.

The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.
Changes can be made without departing from the spirit of the invention. For example, instead of the bottom plate 3a of the carriage 3 or the guide holes 30, 99f of the actuator base 99, which is the mounting portion, a protrusion is provided, and guide holes are provided in the reflection mirrors 80, 90 so as to correspond to the protrusions. You may do it. Although the resin-molded optical component has been described as a reflection mirror, other optical components, such as a diffraction grating, may be used.

[0073]

According to the resin molded optical component of the present invention described above, a flat plate having an optically functional surface and a base for holding the flat plate at a predetermined angle are formed by resin molding. The part has a mounting surface part that can be mounted on the part to be mounted, so the flat part is flat and parallel (thickness is uniform), so distortion due to shrinkage during resin curing can be reduced,
The flatness of the optical function surface is maintained, and the accuracy of the optical function can be maintained.

Further, there is provided a mounting structure for mounting a resin molded optical component integrally provided with a flat plate portion having an optical function surface and a base portion holding the flat plate portion at a predetermined angle to an optical pickup, A mounting surface portion that can be mounted on a carriage that forms an optical pickup is formed on the portion, and the flat plate portion is a reflection mirror that is held at an angle of 45 degrees with respect to the mounting surface of the mounting surface portion and emitted from the laser diode. By reflecting the laser light in a direction orthogonal to the disk surface of the optical disk, the laser light can be accurately emitted to a predetermined location on the optical disk surface via the mirror surface.

Further, since the base portion is formed continuously at the lower end portion of the reflection mirror, the mirror surface of the reflection mirror can be moved with respect to the bottom surface by simply mounting it on the bottom surface of the carriage.
Since the angle can be set to 5 degrees, there is no need to adjust the angle of the mirror surface, and the work can be facilitated.

The reflecting mirror is formed in a square shape, supports an objective lens on the carriage, and has an actuator section for moving the objective lens in a predetermined direction. The reflecting mirror is located below the objective lens. Since the upper end corner of the reflection mirror is provided and cut off, a part of the actuator section supporting the objective lens can be smoothly driven without colliding with the flat plate section together with the objective lens. Further, since the space between the objective lens and the reflection mirror can be reduced, it is possible to cope with a reduction in thickness.

Further, since the position of the gate at the time of resin molding is provided at the tip end surface of either the reflection mirror or the base portion, the resin flow pressure at the time of resin molding at the optical function surface can be kept constant. And the optical function surface can be formed with higher precision.

An opening is formed in the bottom surface of the carriage, the base unit is connected to the upper end of the flat plate, and the lower end of the flat plate is inserted into the opening. Since the shaft can be moved as close as possible to the carriage, the thickness can be further reduced.

Further, since the mounting surface of the base portion is formed wider than the width of the flat plate portion, the area of the mounting portion of the mounting surface is increased, so that the mounting can be performed stably and reliably.

Further, an engagement portion and an engagement receiving portion which can be engaged with each other are provided between the base portion and the carriage, and are provided only in the direction along the optical axis of the laser beam incident on the reflection mirror. Since the position can be adjusted by sliding the base part, it is only necessary to adjust the position along the optical axis of the laser beam, so there is no need for complicated adjustment such as angle adjustment of the optical function surface, and it is easy. Can be assembled.

The engaging portion is a projection projecting from the mounting surface, and the engagement receiving portion is engaged with the projection and is a guide hole formed in the carriage to be mounted. Since the projections of the base portion and the guide holes of the carriage can be easily formed, and the respective configurations can be easily formed, a complicated adjustment mechanism does not need to be used.

Further, an actuator base and an actuator portion for drivingably supporting the objective lens are provided on the actuator base, the engagement portion is a projection projecting from the mounting surface portion, and the engagement receiving portion is a projection. Since the optical function portion can be directly attached to the actuator base by having at least one pair of guide holes formed in the actuator base and being parallel to each other, the center of the optical function surface (the center point on the optical axis) ) And the center of the objective lens can be reliably performed.

Also, a rack is formed on the side wall of the base portion, a jig insertion hole is formed on the bottom surface of the mounting portion close to the rack, and a part of a jig provided with a pinion in the jig insertion hole. By inserting the pinion so as to be rotatable and engaging the pinion with the rack to slide the base, the position can be easily adjusted simply by rotating the pinion of the jig. Can be. Fine adjustment can be easily performed by setting a high gear ratio.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an optical system of an optical pickup on which a resin molded optical component according to a first embodiment of the present invention is mounted.

FIG. 2 is an overall perspective view of a resin molded optical component according to the first embodiment of the present invention.

FIG. 3 is an overall perspective view showing a first modification of the resin-molded optical component according to the first embodiment of the present invention.

FIG. 4 is an overall perspective view showing a second modification of the resin-molded optical component according to the first embodiment of the present invention.

FIG. 5 is an overall perspective view showing a third modification of the resin molded optical component according to the first embodiment of the present invention.

FIG. 6 is an overall perspective view showing a fourth modification of the resin molded optical component according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram of an optical system of an optical pickup mounted with a resin molded optical component according to a second embodiment of the present invention.

FIG. 8 is an overall perspective view of a resin molded optical component according to a second embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a main part of an optical pickup mounted with a resin molded optical component according to a second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a main part of an optical pickup mounted with a resin molded optical component according to a second embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a main part of an optical pickup mounted with a resin molded optical component according to a second embodiment of the present invention.

FIG. 12 is a plan view of a main part of a carriage bottom surface of an optical pickup on which a resin molded optical component according to a second embodiment of the present invention is mounted.

FIG. 13 is a plan view of a resin molded optical component according to a second embodiment of the present invention.

FIG. 14 is a bottom view of a resin molded optical component according to a second embodiment of the present invention.

FIG. 15 is a perspective view of a main part for describing mounting adjustment of a resin molded optical component according to a second embodiment of the present invention.

FIG. 16 is a side view of an optical pickup mounted with a resin molded optical component according to a second embodiment of the present invention.

FIG. 17 is an overall perspective view of an optical pickup on which a conventional resin molded optical component is mounted.

FIG. 18 is a view for explaining a method of attaching a triangular prism which is another conventional resin molded optical component.

[Explanation of symbols]

Reference Signs List 1 optical pickup (optical pickup device) 3 carriage 3c guide hole 4 opening 10, 30, 40, 50, 60, 80, 90 reflection mirror (resin molded optical component) 12, 82, 92 base parts 12b, 82b, 92b mounting Surface part (bottom part) 14, 84g Flat part (parallel plate part) 14a, 84a Optical function surface (reflection surface) 22 Objective lens 84 Optical function part 84f Support part 89 Lens actuator 92f Projection part 94 Rack 95 Jig insertion hole 99 Actuator Base 99f Guide hole

Claims (14)

[Claims] 1. A flat plate portion having an optical function surface and a base portion holding the flat plate portion at a predetermined angle are resin-molded, and the base portion has a mounting surface portion that can be mounted on a mounting portion. A resin-molded optical component. 2. A mounting structure for mounting a resin molded optical component integrally provided with a flat plate portion having an optical function surface and a base portion holding the flat plate portion at a predetermined angle to an optical pickup, A mounting surface portion that can be mounted on a carriage forming the optical pickup is formed on the base portion,
The flat plate portion is a reflection mirror, is held at an angle of 45 degrees with respect to the mounting surface of the mounting surface portion, and reflects the laser light emitted from the laser diode in a direction orthogonal to the disk surface of the optical disk. Optical pickup device with resin molded optical parts. 3. An optical pickup device comprising a resin-molded optical component according to claim 2, wherein said base portion is formed continuously from a lower end portion of said reflection mirror. 4. The reflection mirror is formed in a rectangular shape, and the carriage supports an objective lens, and is mounted with an actuator unit for moving the objective lens in a predetermined direction. The optical pickup device provided with a resin-molded optical component according to claim 3, wherein the optical component is disposed below the lens, and an upper end corner of the reflection mirror is cut off. 5. An optical pickup device provided with a resin-molded optical component according to claim 3, wherein a gate position at the time of resin molding is provided at a tip end surface of one of said reflection mirror and said base portion. . 6. An opening is formed in a bottom surface of the carriage, and the base unit is connected to an upper end side of the flat plate unit,
The optical pickup device according to claim 2, wherein a lower end portion of the flat plate portion is inserted into the opening. 7. The mounting portion of the base portion is formed wider than the flat plate portion.
An optical pickup device provided with the resin-molded optical component according to 1. 8. An interlocking engagement portion and an engagement receiving portion are provided between the base portion and the carriage, and are provided along an optical axis of laser light incident on the reflection mirror. The optical pickup device provided with the resin-molded optical component according to claim 2, wherein the position of the base portion is slidable only in the direction. 9. The engaging portion is at least one pair of projecting portions projecting from the mounting surface portion and being parallel to each other. The engagement receiving portion engages with the projecting portion and is formed in the carriage. An optical pickup device provided with the resin molded optical component according to claim 8, wherein the optical pickup device is a guide hole. 10. The engaging portion is at least a pair of parallel guide holes formed in the mounting surface portion, and the engagement receiving portion is engaged with the guide hole and protrudes from the carriage. An optical pickup device comprising the resin-molded optical component according to claim 8, wherein the optical pickup device is a projection. 11. A mounting structure for mounting a resin molded optical component integrally provided with a flat plate portion having an optical function surface and a base portion for holding the flat plate portion at a predetermined angle to an optical pickup, A mounting surface portion that can be mounted on the mounting portion is formed on the base portion, and the flat plate portion is a reflection mirror, is held at an angle of 45 degrees with respect to the mounting surface of the mounting surface portion, and is emitted from the laser diode. The laser beam is reflected in a direction orthogonal to the disk surface of the optical disk, and an engagement portion and an engagement receiving portion are provided between the base portion and the attached portion, the engagement portion and the engagement receiving portion being mutually engageable. An optical pickup device comprising a resin-molded optical component, wherein the position of the base portion is slidable only in a direction along an optical axis of the laser light incident on a reflection mirror. 12. An actuator base which is the mounting portion, and a lens actuator which supports the objective lens so as to be drivable on the actuator base, wherein the engaging portions are at least one parallel to each other protruding from the mounting surface portion. The resin-molded optical component according to claim 11, wherein the engagement receiving portion is at least a pair of parallel guide holes formed in the actuator base. Optical pickup device. 13. An actuator base which is the mounting portion, and a lens actuator which supports the objective lens so as to be drivable on the actuator base, wherein the engaging portions are formed in parallel with each other and formed on the mounting surface portion. 12. The optical pickup device according to claim 11, wherein the at least one pair of guide holes is provided, and the engagement receiving portion is a protrusion protruding from the actuator base. 14. A rack is formed on a side wall of the base portion, a jig insertion hole is formed on a bottom surface of the attached portion close to the rack, and a pinion is provided in the jig insertion hole. The pinion is rotatably arranged by inserting a part of a jig, and the pinion is meshed with the rack to slide the base portion. An optical pickup device comprising the resin-molded optical component according to any one of the above.