JP2000076699A - Device for bonding optical element and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a bonded parts by constituting so that a thermosetting adhesives between an optical element and a seat surface may be hardend by heating. SOLUTION: A position for mounting an imaging lense 30 is a groove of a nearly pentagonal section, and a V-shaped slope corresponding to the botom of the groove is a seat surface 51 for mounting the imaging lense 30, to which a thermosetting adhesives is applied. A holder 120 has a pair of upper and lower shaft members 130, 140, and the upper shaft member 130 and the lower shaft member 140 have a joined through hole 135 for vacuum sucion connected to a vacuum device. The through hole 135 has its opening at the lower side of the lower shaft member 140 and sucks the image lense 30. On the backside of the seat surface 51 of a base 50 is provided another heating coil 160, which is mounted on a fore end of a pair of pins 165 abutted to the backside of the seat surface 51 of the base 50; the heat of the heating coil 160 heated by supplied power reaches the adhesives between the imaging lens 30 and the seat surface 51 through the base 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a bonding device for mounting an optical element on a base of an optical disk device or the like.

[0002]

2. Description of the Related Art FIG. 10 shows an example of a conventional optical element bonding apparatus. The bonding device shown in FIG. 10 includes an optical element (lens) 520 on a seating surface 510 of a base 500 such as an optical disk.
Is to adhere. The part to which the optical element 520 is attached is a groove having a substantially pentagonal cross section. And
The V-shaped slope corresponding to the bottom of the groove is the seat surface 510 to which the optical element 520 is bonded. An ultraviolet-curable adhesive is applied to the seat surface 510 in advance.

The conventional bonding apparatus includes a holder 560 for holding the optical element 520 by suction and pressing the optical element 520 against the seating surface 510 of the base 500, and an ultraviolet irradiation device 550 for irradiating the seating surface 510 with ultraviolet light. When the optical element 520 is pressed against the seat surface 510, the adhesive is pressed between the optical element 520 and the seat surface 510. When the adhesive is irradiated with ultraviolet light in this state, the adhesive is cured, and the optical element 520 is placed on the seating surface 510.
Adhered to.

[0004]

However, if the size of the base 500 is as shown by the solid line in the figure, the ultraviolet light from the ultraviolet irradiation device 550 is blocked by the base 500. Therefore, in order to secure a path for ultraviolet rays to the seating surface 510, the base 500 must be enlarged as shown by a two-dot chain line in the drawing, which is an obstacle to miniaturization of components.
In order to reduce the size of the base 500, it is possible to provide a cutout in the base 500.
However, there is a problem that the strength of No. 0 decreases.

[0005] In view of the above-mentioned circumstances, an object of the present invention is to reduce the size of a component to which an optical element is bonded.

[0006]

In order to solve the above problems, an optical element bonding apparatus according to the present invention comprises: (1) holding means for holding an optical element and pressing the optical element against a bearing surface of a predetermined component; 2) a heating unit configured to heat a contact portion between the optical element and the seating surface in a state where the holding unit presses the optical element against the seating surface. The thermosetting adhesive between the optical element and the seating surface is configured to be cured by heating.

As described above, when the optical element is pressed against the seating surface, heat is applied to the contact portion between the optical element and the seating surface to cure the thermosetting adhesive, thereby eliminating the need for ultraviolet irradiation. . That is, since there is no need to secure a path for ultraviolet rays, there is no need to enlarge the base. Therefore, the size of the component can be reduced accordingly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, near field recording (NFR: near) has been proposed in response to a demand for an external storage device accompanying the progress of hardware and software related to a computer in recent years, particularly, a demand for a large storage capacity. field recordin
g) An outline of a magneto-optical disk recording / reproducing apparatus using a recording / reproducing method called a technique will be described with reference to FIGS.

FIG. 1 is an overall schematic diagram of the optical disk device. In the optical disk device 1, an optical disk 2 is mounted on a rotating shaft 2a of a spindle motor (not shown). On the other hand, a rotating (coarse movement) arm 3 is mounted in parallel with the recording surface of the optical disc 2 in order to reproduce or record information on the optical disc 2. The rotating arm 3 is rotatable around a rotating shaft 5 by a voice coil motor 4. A floating optical head 6 having an optical element mounted thereon is mounted on a tip of the rotating arm 3 facing the optical disk 2. Further, a light source module 7 having a light source unit and a light receiving unit is disposed near the rotation shaft 5 of the rotation arm 3, and is configured to be driven integrally with the rotation arm 3.

FIGS. 2 and 3 illustrate the distal end portion of the rotating arm 3, and particularly illustrate the floating optical head 6 in detail. The floating optical unit 6 is attached to the flexure beam 8 and is arranged to face the optical disc 2. The flexure beam 8 is fixed to the rotating arm 3 at the other end, and presses the floating optical unit 6 at the distal end portion in a direction in which the floating optical unit 6 comes into contact with the optical disc 2 by the elastic force of the flexure beam 8.

The floating optical unit 6 includes a floating slider 9, an objective lens 10, and a solid immersion lens (S
IL) 11 and a magnetic coil 12 and function to converge a parallel laser beam 13 emitted from the light source module 7 onto the optical disc 2. A deflection mirror 31 is fixed to the tip of the rotating arm 3 to guide the laser beam 13 to the floating optical unit 6. The laser beam 13 incident on the objective lens 10 by the deflection mirror 31 is converged by the refraction of the objective lens 10. A solid immersion lens 11 is arranged near the converging point, and irradiates the convergent light to the optical disc 2 as finer evanescent light 15.

A magnetic coil 12 for recording by magneto-optical recording is formed around the solid immersion lens 11 facing the optical disk 2, and a magnetic field required for recording is recorded on the recording surface of the optical disk 2. It can be applied. The evanescent light 15 and the magnetic coil 12 enable high-density recording and reproduction on the optical disk 2. The floating optical unit 6 floats by a very small amount due to the airflow generated by the rotation of the optical disk 2 and follows the surface runout of the optical disk 2. For this reason, focus control (focus servo) of the objective lens, which is required in the conventional optical disk device, is not required.

The light source module 7 mounted on the rotating arm 3 and the light beam guided to the floating optical unit 6 will be described in detail below with reference to FIGS. Rotating arm 3
Is mounted with a floating optical unit 6 at the tip and a driving coil 16 for driving the voice coil motor 4 at the other end.
Is fixed. The drive coil 16 is a flat coil, and is inserted and arranged in a magnetic circuit (not shown) with a gap. The rotating shaft 5 and the rotating arm 3 are bearings 17 and 1
7, the rotation arm 3 can be rotated about the rotation shaft 5 by the electromagnetic action with a magnetic circuit when a current is applied to the drive coil.

The light source module 7 mounted on the rotating arm 3 has a semiconductor laser 18, a laser driving circuit 19,
Collimating lens 20, composite prism assay 21, laser power monitor sensor 22, reflection prism 2
3, a data detection sensor 24 and a tracking detection sensor 25 are arranged. The laser beam in a divergent beam state emitted from the semiconductor laser 18 is converted into a parallel beam by the collimating lens 20. The cross-sectional shape of the parallel light beam is an elliptical shape due to the characteristics of the semiconductor laser 18, and it is inconvenient to narrow the light beam onto the optical disk 2 minutely. Therefore, the cross-sectional shape of the parallel light beam is shaped by making the parallel light beam having an elliptical cross section emitted from the collimating lens 20 enter the composite prism assay 21.

The entrance surface 21a of the composite prism assay 21
Has a predetermined slope with respect to the incident optical axis. By refracting the incident light, the cross-sectional shape of the parallel light beam can be shaped from an oval shape to a substantially circular shape. The shaped laser beam travels through the complex prism assay 21 and enters the first half mirror surface 21b. The first half mirror surface 21b is set to guide the information obtained from the optical disc 2 to the data detection sensor 24 and the tracking detection sensor 25, but the output of the laser emitted from the semiconductor laser 18 on the outward path. It serves to separate the light beam to the laser power monitor sensor 22 for detecting power.

Since the laser power monitor sensor 22 outputs a current proportional to the intensity of the received light, the output of the semiconductor laser 18 can be stabilized by feeding back this output to a laser power control circuit (not shown). . The laser beam 13 having a substantially circular cross section emitted from the composite prism assay 21 is irradiated on the galvanomirror 26, and the traveling direction of the laser beam 13 is changed. The galvanomirror 26 is rotated about an axis perpendicular to the plane of the paper, and can swing the laser beam 13 by a small angle in a direction parallel to the plane of the paper.

The galvanometer mirror 26 is for fine movement tracking. That is, when the galvanometer mirror 26 is rotated, the angle of incidence of the laser beam 13 incident on the objective lens 10 changes, and accurate tracking control is performed by utilizing the fact that the converged beam moves on the optical disk 2 in the tracking direction. Done. The access operation over the inner circumference / outer circumference of the optical disk 2 is performed by rotating the rotating arm 3.
Only minute tracking control is performed by rotating the galvanometer mirror 26.

Behind the galvanometer mirror 26, a mirror position detection sensor 28 for detecting the rotation angle of the galvanometer mirror 26 is provided. The laser beam 13 reflected by the galvanomirror 26 is transmitted to a first relay lens 29
Then, the light passes through a second relay lens (imaging lens) 30 and is reflected by the deflecting mirror 31 to reach the floating optical unit 6. The first relay lens 29 and the second relay lens 30 make the relationship between the reflection surface of the galvanometer mirror 26 and the pupil surface (principal plane) of the objective lens 10 arranged in the floating optical unit 6 into a conjugate relationship. That is, a relay lens optical system is formed.

When fine movement tracking is performed by rotating the galvanomirror, if the optical distance between the galvanomirror 26 and the objective lens 10 is long, the amount of movement of the laser beam 13 incident on the objective lens 10 increases. There is a case where the light cannot enter the objective lens 10. In order to avoid such a phenomenon, the first relay lens 29 and the second relay lens 30 are set so that the relationship between the reflection surface of the galvanometer mirror 26 and the pupil surface of the objective lens 10 becomes a conjugate relationship. Even if the galvanomirror 26 rotates, the laser beam 13 incident on the objective lens 10 does not move, and accurate tracking control can be performed.

The returning laser beam 13 reflected from the optical disk 2 returns in the reverse direction to the forward path, is reflected by the galvanometer mirror 26, and enters the composite prism assay 21. Thereafter, the light is reflected by the first half mirror surface 21b and travels to the second half mirror surface 21c. The second half mirror surface 21c generates transmitted light directed to the tracking detection sensor 25 and reflected light directed to the data detection sensor 24, and separates the laser beam on the return path. The laser beam transmitted through the second half mirror surface 21c is applied to the tracking detection sensor 25, and outputs a tracking error signal.

On the other hand, the laser beam reflected by the second half mirror surface 21c is polarized and separated by the Wollaston prism 32, converted into convergent light by the condenser lens 33, and then reflected by the reflection prism 23 to be detected by the data detection sensor. 24. The data detection sensor 24 has two light receiving areas, and receives two polarized beams separated by the Wollaston prism 32 to read data information recorded on the optical disk 2 and output a data signal. To be precise, the tracking error signal and the data signal are generated by a head amplifier circuit (not shown) and sent to a control circuit or an information processing circuit.

Next, an apparatus for bonding the above-mentioned second relay lens (imaging lens) 30 to the base of the arm 3 (hereinafter simply referred to as the base 50) will be described. FIG. 6 is a sectional view showing the bonding apparatus 100. The portion of the base 50 where the imaging lens 30 is attached is a groove having a substantially pentagonal cross section. The V-shaped slope corresponding to the bottom of the groove is formed by the imaging lens 30.
Is a seating surface 51 to which is attached. A thermosetting adhesive is applied to the seat surface 51.

The bonding apparatus 100 has a mount (not shown) on which the base 50 is mounted, and a holder 120 for holding the imaging lens 30 and positioning the imaging lens 30 on the seating surface 51 of the base 50. The holder 120 is configured to hold the imaging lens 30 by suction by vacuum suction.
Further, the holder 120 is moved in a direction approaching and leaving the base 50 (up and down in the figure) by a driving mechanism (not shown).
Moving. When the base 50 is set at a predetermined position on a gantry (not shown) and the holder 120 is moved downward, the imaging lens 30 held by the holder 120 is pressed against the seating surface 51 of the base 50.

The holder 120 includes a pair of upper and lower shaft members 13.
0, 140. Upper shaft member 13
0 is connected to the above-mentioned drive mechanism (not shown). Through holes 135 for vacuum suction connected to a vacuum device (not shown) penetrate the upper and lower shaft members 130 and 140.
The through hole 135 is opened at the lower end of the lower shaft member 140, and the imaging lens 30 is sucked through the opening.

A heating coil 110 is wound around the lower shaft member 140. The heating coil 110 is supplied with electric power from a power supply (not shown) and generates heat. Heating coil 110
Heat reaches the adhesive between the imaging lens 30 and the seating surface 51 via the shaft member 140 and the imaging lens 30.

Flanges 131 and 141 are formed at the connecting portions of the upper and lower shaft members 130 and 140, respectively. The flanges 131 and 141 are fastened and fixed by bolts 132 and nuts 142 with the heat insulating member 150 interposed therebetween. Thus, the upper and lower shaft members 13
Because the heat insulating member 150 is interposed between 0 and 140,
The heat of the heating coil 110 is not transmitted to the above-described drive mechanism and the like. Note that a through hole is also formed at a position corresponding to the above described through hole 135 of the heat insulating member 150.

On the back side of the seating surface 51 of the base 50, another heating coil 160 is provided. Heating coil 160
Is attached to the tip of a pair of pins 165 that abut against the back surface of the seating surface 51 of the base 50. The heating coil 160 is supplied with electric power from a power supply (not shown) and generates heat. The heat of the heating coil 160 reaches the adhesive between the imaging lens 30 and the seat surface 51 via the base 50.

As described above, according to the bonding apparatus of the first embodiment, the adhesive between the imaging lens 30 and the seating surface 51 is heated and hardened by the heat from the heating coils 110 and 160. UV irradiation is not required.
Therefore, there is no need to provide a path for ultraviolet rays, and the base 50 can be reduced in size accordingly.

Next, a second embodiment of the present invention will be described. The bonding apparatus 200 according to the second embodiment mounts the composite prism assay 21 (FIG. 4) of the light source module 7 on a horizontal seating surface 52 of a base 50. FIG. 7 is a cross-sectional view showing a bonding apparatus 200 for bonding a composite prism assay 21 (hereinafter, simply referred to as a prism 21) to a seating surface 52. In FIG. 7, the composite prism assay 21 (hereinafter, simply referred to as the prism 21) is shown as a square block. As in the first embodiment, a thermosetting adhesive is applied to the seat surface 52.

The bonding apparatus 200 according to the second embodiment includes a gantry (not shown) for supporting the base 50 and a holder 220 for holding the prism 21. Holder 220
Is provided with upper and lower shaft members 230 and 240, a heating coil 210, and a heat insulating member 250. These components are configured similarly to the first embodiment. However, the lower end 245 of the lower shaft member 240 is
1 is configured to engage with the upper end.

When the heating coil 210 generates heat while the prism 21 is pressed against the seating surface 52, the heating coil 21
The heat of 0 reaches the adhesive between the prism 21 and the seating surface 52 via the shaft member 240 and the prism 21. Another heating coil 260 is provided behind the seating surface 51 of the base 50. The heating coil 260 is attached to the tip of a pin 265 that contacts the back surface of the seat surface 52 of the base 50.
The heat of the heating coil 260 reaches the adhesive layer between the prism 21 and the seating surface 52 via the base 50.

As described above, according to the bonding apparatus of the second embodiment, the adhesive between the prism 21 and the seating surface 51 is hardened by the heat from the heating coils 210 and 260.
UV irradiation is not required. Therefore, there is no need to secure a path for ultraviolet rays, and other members can be arranged around the prism 21.

Next, a third embodiment of the present invention will be described. The bonding apparatus 300 according to the third embodiment is for bonding the galvanomirror 26 described above to the base 50. 8 and 9 are a perspective view and a sectional view showing the bonding device 300. As shown in FIG. 8, the galvanomirror 26
Is supported by a substantially rectangular parallelepiped mirror housing 60.

A pair of mounting flanges 62 are provided at both left and right ends of the mirror housing 60. The base 50 is provided with a pair of horizontal seating surfaces 53 for mounting the pair of mounting flanges 62 of the mirror housing 60. As in the first and second embodiments, the seating surface 53
Is coated with a thermosetting adhesive. The upper part of the base 50 is covered with a cover 55, and the opening 5 for mounting the mirror housing 60 is provided above the seat surface 53.
6 are formed.

The bonding device 300 has a block-shaped support member 310 and a pair of holding pins 320 extending downward from the support member 310. The support member 310 is connected to a drive mechanism (not shown), and moves in a direction (up and down in the figure) to approach and separate from the base 50. The tip portions 321 of the pair of holding pins 320 are connected to the mirror housing 6.
0 engage with holes 64 formed in a pair of mounting flanges 62, respectively. Thus, the holding pins 320 hold the mirror housing 60.

When the base 50 is set at a predetermined position on a frame (not shown) and the holding pins 320 holding the mirror housing 60 are lowered, the mounting flange 62 of the mirror housing 60 is pressed against the seating surface 53 of the base 50. (FIG. 9). Here, a heating coil 330 is wound around each holding pin 320. When the heating coil 330 generates heat in a state where the mounting flange 62 of the mirror housing 60 is pressed against the seating surface 53, the heat of the heating coil 330 passes through the holding pin 310 and the mirror housing 60, and the heat of the mounting coil 62 Reach the glue between.

As described above, according to the bonding apparatus of the third embodiment, the adhesive between the mounting flange 62 of the mirror housing 60 and the seat surface 53 is hardened by the heat from the heating coil 330, so that the ultraviolet irradiation is not performed. It becomes unnecessary. Therefore,
There is no need to secure a path for ultraviolet rays, and other members can be arranged around the mirror housing 60.

In the above embodiments, the bonding of the imaging lens 30, the composite prism assay 21, and the galvanomirror 26 has been described. However, these embodiments can be applied to the bonding of other optical elements.
Further, each of the above-described embodiments can be applied to bonding of optical elements of optical disk devices other than the near-field recording type optical disk device described with reference to FIGS.

[0039]

As described above, according to the optical element bonding apparatus of the present invention, by applying heat to the contact portion between the optical element and the seat surface while the optical element is pressed against the seat surface,
Since the thermosetting adhesive between the optical element and the seating surface is cured, ultraviolet irradiation is not required. Therefore, it is not necessary to secure a path for ultraviolet rays, and the components can be downsized accordingly.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of a magneto-optical disk device according to an embodiment.

FIG. 2 is a diagram showing a distal end portion of a rotating arm.

FIG. 3 is a cross-sectional view showing a floating optical unit.

FIG. 4 is a plan view showing a deflection mirror and a floating optical unit.

FIG. 5 is a side sectional view of a rotating arm.

FIG. 6 is a cross-sectional view illustrating the bonding device according to the first embodiment.

FIG. 7 is a cross-sectional view illustrating a bonding device according to a second embodiment.

FIG. 8 is a perspective view illustrating a bonding device according to a third embodiment.

FIG. 9 is a cross-sectional view illustrating the bonding device of FIG. 8;

FIG. 10 is a view showing a conventional bonding apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 bonding device 110 heating coil 120 holding portion 130 upper shaft member 140 lower shaft member 150 heat insulating member 160 heating coil 300 bonding device 320 holding pin 330 heating coil

Claims (8)

[Claims] 1. A holding means for holding an optical element and pressing the optical element against a seating surface of a predetermined component, and the optical element and the seat while the holding means is pressing the optical element against the seating surface. A heating unit for heating a contact portion of a surface, wherein the thermosetting adhesive between the optical element and the seating surface is cured by heating. 2. The optical element bonding apparatus according to claim 1, wherein the heating means is attached to the holding means. 3. The holding means is a shaft-shaped member, and the one end in the axial direction holds the optical element by suction, and the heating means is a coil wound around the shaft-shaped member. The optical element bonding apparatus according to claim 1, wherein: 4. The shaft-shaped member is composed of at least a first part and a second part, and the first part holds the optical element by suction and a heating coil. Means for moving the holding portion is connected to the second portion, and a heat insulating member is provided between the first and second portions. The optical element bonding apparatus according to claim 3. 5. The method according to claim 5, wherein the first and second portions each have a flange portion, and the flange portions of the first and second portions are fixed to each other with the heat insulating member interposed therebetween. The bonding device for an optical element according to claim 4. 6. The shaft member has a through hole for vacuum suction penetrating the shaft member in the axial direction, and the through hole is open at the one end of the shaft member. The bonding device for an optical element according to claim 3, wherein: 7. The component according to claim 1, further comprising: a contact portion which is in contact with a surface of the component on the back side of the seating surface, and wherein the heating means is provided in the contact portion. 3. The bonding device for an optical element according to claim 1. 8. The apparatus according to claim 1, wherein said holding means is configured to hold said optical element by a plurality of holding pins, and a heating coil is wound around each of said holding pins. The bonding device for an optical element according to any one of the above.