JP2000331351A - Laser unit and laser unit mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the exact regulation of a package of a laser unit in such a manner that distortion force is not applied in an optical axis direction. SOLUTION: Both sides of flanks 11a of a package body 11 orthogonal with the optical axis of an exit laser beam are provided with recessed parts 16 to be fitted to the clamper of a mounting device so as to recess in a direction orthogonal with the optical axis of the exit laser beam. The force by holding and clamping in the clamper is prevented from being acted in the optical axis direction of the exit laser beam in the package body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser unit which is mounted on a pickup of an optical disk drive and is applied to a hologram laser unit, and a laser unit which mounts the laser unit on a mounting object such as a housing of the optical disk drive. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, an optical disk drive device, such as a laser unit described in Japanese Patent Application Laid-Open No. 8-77567, uses an optical disk for optically reading or writing information recorded on an optical disk. 2. Description of the Related Art In a pickup, a laser unit in which a semiconductor laser element and another optical component are integrally housed in the same package has been used.

FIG. 11 is a perspective view of an example of a laser unit described in Japanese Patent Application Laid-Open No. 8-77567, and FIG. 12 is a perspective view showing a part of an optical pickup equipped with the laser unit of FIG. Is a package of the laser unit in which the laser element is housed, 2 is a metal terminal, 3
Is a hologram element in which a diffraction grating for separating laser light is provided on one side for detecting a tracking error signal and a focus error signal, and the hologram element 4 is provided on the opposite side (back side) of the package 1 from the laser emission side. And a recess into which a jig for rotation adjustment is fitted.

In the optical pickup shown in FIG. 12, reference numeral 5 denotes a printed circuit board on which a package 1 of a laser unit is mounted, 6 an objective lens for condensing laser light emitted from the laser unit onto an optical disk D, and 7 a laser light. Is a reflection mirror that deflects light.

FIG. 13 is an explanatory view showing a state where the package 1 is adjusted using a general flathead screwdriver 8 with a jig. The tip 8a of the flathead screwdriver 8 is fitted into the concave portion 4 of the package 1, and So that the amplitude of the detected tracking error signal and focus error signal is maximized.
The package 1 is rotated in an adjustment direction about the optical axis of the laser light.

[0006]

However, the adjustment of the conventional laser unit in the package 1 is performed by rotating the package 1 while pressing a jig such as a driver from the back of the package 1. When the package 1 is rotated with an excessive force,
The back side of the package 1 may bend in the optical axis direction to cause distortion, so that the positions of the laser element and the light receiving element installed on the back side of the package 1 in the optical axis direction deviate from a predetermined relationship, and Is unsatisfactory.

[0007] Even if the adjustment is performed without the above-mentioned inconvenience, if the package 1 is still in a state where stress is applied in the optical axis direction, the package 1 gradually changes with time, and the initial adjustment is performed. There is a problem in that the optical disc drive device may be displaced, which may hinder recording and reproduction in the mounted optical disk drive device.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to provide a laser unit having a structure capable of accurately adjusting the mounting of a package of a laser unit so that a distortion force is not applied in the optical axis direction. And a laser unit mounting device.

[0009]

According to a first aspect of the present invention, there is provided a light emitting unit for emitting a laser beam, and a laser beam for detecting a tracking error signal and a focus error signal. In a laser unit provided with a diffraction grating, a convex portion or a concave portion for mounting adjustment is provided on a side surface of a package body orthogonal to an optical axis of the emitted laser light.

According to a second aspect of the present invention, there is provided a laser unit comprising: a light emitting unit for emitting a laser beam; and a diffraction grating for separating the laser beam for detecting a tracking error signal and a focus error signal. On the side surface of the package main body orthogonal to the optical axis of the laser light, a convex or concave portion for mounting adjustment is provided so as to extend in a direction parallel to the optical axis.

According to a third aspect of the present invention, there is provided a laser unit comprising: a light emitting unit for emitting a laser beam; and a diffraction grating for separating the laser beam for detecting a tracking error signal and a focus error signal. On the side surface of the package body orthogonal to the optical axis of the laser light, a convex portion or a concave portion for mounting adjustment is provided so as to extend in a direction orthogonal to the optical axis.

According to the configuration of the laser unit according to the present invention, the working force at the time of adjustment is applied in a direction orthogonal to the optical axis of the package. It is possible to prevent the application of stress in the direction and the occurrence of displacement and the like, and it is also possible to accurately adjust a package in which electrodes are provided on the side opposite to the laser beam emission side.

According to a fourth aspect of the present invention, there is provided a laser unit mounting apparatus for mounting the laser unit according to the first aspect on an object to be mounted, wherein the package main body is orthogonal to an optical axis of emitted laser light in the laser unit. A concave portion that fits into the mounting adjustment protrusion provided on the side surface, or a pair of clampers provided with a projection that fits into the mounting adjustment recess provided on the side surface is provided. The configuration is such that the mounting adjustment is performed while being held.

The invention according to claim 5 is the same as the above-described claim 2.
A laser unit mounting device for mounting the laser unit according to the above, to a mounting object, the laser unit extending in a direction parallel to the optical axis on a side surface of a package body orthogonal to an optical axis of emitted laser light in the laser unit. The concave portion that fits into the convex portion for mounting adjustment provided so as to extend, or the convex portion that fits into the concave portion for mounting adjustment provided on the side surface extends in a direction parallel to the optical axis. A pair of clampers are provided as described above, and the mounting adjustment is performed while the package body is movably clamped with respect to the optical axis by the clampers.

[0015] The invention according to claim 6 is the invention according to claim 3.
A laser unit mounting device for mounting the laser unit according to claim 1, to a mounting object, wherein the laser unit extends in a direction orthogonal to the optical axis on a side surface of a package body orthogonal to an optical axis of an emitted laser beam in the laser unit. The concave portion that fits into the mounting adjustment convex portion provided so as to fit, or the convex portion that fits into the mounting adjustment concave portion provided on the side surface extends in a direction orthogonal to the optical axis. A pair of clampers are provided as described above, and the mounting adjustment is performed while holding the package body between the clampers.

According to the configuration of the laser unit mounting apparatus according to the present invention, the package is held by the clamper.
Adjustment can be performed while holding, and the clamping and holding force of the damper is applied in a direction perpendicular to the optical axis of the package. It is possible to prevent the occurrence of misalignment and misalignment, and to clamp and hold the package by the clamp in an appropriate mounting state according to the specification.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a perspective view of a laser unit according to a first embodiment of the present invention viewed from the bottom side and the front side, and FIG. 1B is a plan view of the laser unit of the first embodiment on the rear side. FIG. 2 is a plan view in which a part of the laser unit according to the first embodiment is sectioned.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a package body of a laser unit LU in which a laser element 12 and a multi-segment light receiving element 13 are accommodated on the inside rear side, and 14 extends to the back side of the package body 11. Metal terminals, 15
A diffraction grating provided on the front side (laser light emission side) of the package body 11 and separating the laser light for detecting a tracking error signal and a focus error signal. A diffraction grating 16 is orthogonal to the optical axis of the emitted laser light. Package body 11
Are recesses for mounting adjustment provided on both sides of the side surface 11a in the direction perpendicular to the optical axis of the emitted laser light.

FIG. 3 shows a laser unit mounting / mounting device for mounting the laser unit on an optical pickup according to the present invention.
FIG. 4 is an exploded perspective view of a main part of the adjustment device of the first embodiment, and FIG. 4 is an exploded perspective view of a main part of the adjustment device. Reference numeral 21 denotes a laser unit LU formed on a housing 22 of the optical pickup.
The mounting holes 23 and 24 are vertically opposed to each other, and a pair of clampers, each of which is provided with a clamp pin 23a and 24a, is provided.
The shaft 26 instructs to be rotatable.
A tension spring that provides an inward bias to 4;
27 is a rotary stay 27a, an X-direction stay 27b,
The adjusting device 28 includes a Y-direction stay 27c and a Z-direction stay 27d.
a, 27b, 27c, 27d.

A method of using the first embodiment of the laser unit mounting / adjusting device will be described.

First, both clampers 23, 24 are opened against the urging force of the tension spring 26, and the clamp pins 23, 24 are opened.
The clampers 23 and 24 are closed by setting the laser unit LU in the positions a and 24a such that the laser emission side faces outward and the recess 16 on the side surface of the package body 11 is fitted. In this clamped state, the laser unit LU is clamped by the clampers 23 and 24,
By moving d in the housing direction, the laser unit LU is moved to the mounting opening 21 of the housing 22 of the optical pickup. At this time, the Z-direction stay 27d is set so as to press the laser unit LU with such a force that the laser unit LU is slightly in contact with the periphery of the mounting opening 21 of the housing 22.

Then, the rotation stay 27a, the X-direction stay 27b, and the Y-direction stay 27c are actuated so that the amplitudes of the tracking error signal and the focus error signal are maximized around the optical axis of the laser beam. The adjustment is performed by rotating the package body 11 or moving the package body 11 in a direction orthogonal to the optical axis. After this adjustment, the package body 11 is attached to the housing 22.

As described above, when the laser unit LU of the first embodiment is mounted on an optical pickup by the laser unit mounting / adjusting device of the first embodiment, the package body 11 is provided with the two clampers 23 and 24. Since the force of holding and holding is not applied in the optical axis direction of the emitted laser light in the package body 11, the diffraction gratings 15 installed on the front side of the package body 11 and the inner back side in the optical axis direction during the mounting adjustment. Alternatively, the positional relationship between the laser element 12 and the multi-segment light receiving element 13 in the optical axis direction can be eliminated, and an excessive force is applied at the time of adjustment as in the conventional example, resulting in an offset between the tracking error signal and the focus error signal. Is generated, and as a result, the problem that accurate adjustment cannot be performed can be solved.

Further, in the configuration of this embodiment, the metal terminal 1
4. Even if the electrodes and the like are installed on the back side of the package body 11, the adjustment can be performed as described above.

FIG. 5A is a perspective view of a laser unit according to a second embodiment of the present invention as viewed from the bottom side and the front side, and FIG. 5B is a plan view of the laser unit of the second embodiment. FIG. 6 is a perspective view as viewed from the side, and in the following description of each embodiment, members corresponding to the members described in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted. This second embodiment is different from the first embodiment in that
Package body 1 orthogonal to the optical axis of the emitted laser light
1 has a configuration in which protrusions 30 for mounting adjustment are provided on both sides of the side surface 11a so as to protrude in a direction orthogonal to the optical axis of the emitted laser light.

FIG. 6A is a perspective view of a laser unit according to a third embodiment of the present invention as viewed from the bottom side and the front side, and FIG. 6B is a plan view of the laser unit of the third embodiment. The third embodiment is different from the first embodiment in the perspective view seen from the side. The difference between the third embodiment and the first embodiment is that the outgoing laser light is provided on both sides of the side surface 11a of the package body 11 orthogonal to the optical axis of the outgoing laser light. In this configuration, a pair of mounting adjustment protrusions 31 is provided so as to protrude in a direction orthogonal to the optical axis.

A laser unit mounting / adjusting device according to the present invention for mounting the laser units LU of the second and third embodiments on an optical pickup is not shown, but referring to FIGS. Clamp pins 23a, 24 are respectively attached to a pair of clampers 23, 24
Instead of a, a configuration is provided in which a concave portion that fits into the convex portions 30 and 31 is provided.

FIG. 7A is a perspective view of a laser unit according to a fourth embodiment of the present invention as viewed from the bottom side and the front side, and FIG. 7B is a plan view of the laser unit of the fourth embodiment. FIG. 14 is a perspective view showing a part of a clamper of a laser unit mounting / adjusting device as viewed from the side, and a difference between the fourth embodiment and the first embodiment is that the fourth embodiment differs from the first embodiment in the optical axis of the emitted laser light in the laser unit LU. The configuration is such that a convex ridge 32 for mounting adjustment is provided on a flat side surface 11a of the package body 11 orthogonal to the optical axis so as to extend in a direction parallel to the optical axis.

A second embodiment of the laser unit mounting / adjusting apparatus according to the present invention for mounting the laser unit LU of the fourth embodiment on an optical pickup is basically the same as that shown in FIGS.
Although the configuration is the same as that of the device shown in FIG. 4, the difference is that, as shown in FIG. 7B, each of the pair of clampers 23 and 32 is provided with a concave groove 33 fitted movably with respect to the optical axis.

For this reason, if the laser unit LU of the fourth embodiment is mounted on an optical pickup by the laser unit mounting / adjusting device of the second embodiment, as in the above-described embodiment, both the package body and the package body can be used. Clamper 23,
24, the force generated by holding and holding the package body 1
1 does not add in the optical axis direction of the emitted laser light,
During the mounting adjustment, it is possible to eliminate the positional deviation in the optical axis direction between the diffraction grating 15 or the laser element 12 and the multi-segment light receiving element 13 installed on the front side of the package body 11 and the inner rear side in the optical axis direction. In addition, it is possible to solve the problem that an excessive force is applied at the time of adjustment as in the conventional example and an offset between the tracking error signal and the focus error signal is generated, and as a result, accurate adjustment cannot be performed.

Further, in the configuration of the present embodiment, it is possible to adjust the rotation of the laser unit LU around the emission of the laser light, and also to adjust the movement of the laser unit LU in a direction perpendicular to the optical axis of the laser light. Further, even when the laser unit LU is applied with an unnecessary force in the optical axis direction in the optical axis direction when the laser unit LU comes into contact with the housing of the optical pickup at the time of the adjustment mounting,
Since the ridges 32 of the package body 11 are movably fitted into the concave grooves 33 of the clampers 23 and 24, the laser unit LU can move away from the optical pickup. There is no stress in the direction and a more reliable adjustment is possible.

FIG. 8A is a perspective view of a laser unit according to a fifth embodiment of the present invention as viewed from the bottom side and the front side, and FIG. 8B is a plan view of the laser unit of the fifth embodiment. FIG. 14 is a perspective view seen from the side, and the difference between this modification and the fourth embodiment is that the optical axis is provided on an arc-shaped side surface 11b of the package body 11 orthogonal to the optical axis of the emitted laser light in the laser unit LU. The configuration is such that a concave groove 34 for mounting adjustment is provided so as to extend in a direction parallel to.

FIG. 9A is a perspective view of a laser unit according to a modification of the fifth embodiment of the present invention as viewed from the bottom and front sides, and FIG. 9B is a modification of the fifth embodiment. It is a perspective view of the laser unit seen from the plane side and the back side,
This modification is different from the fifth embodiment in that the flat surface 11a of the package body 11 orthogonal to the optical axis of the emitted laser light in the laser unit LU extends in a direction parallel to the optical axis. The groove 35 for adjusting the mounting
Is provided.

A laser unit mounting / adjusting device according to the present invention for mounting the laser unit LU of the fifth embodiment and the modified example on an optical pickup is not shown in FIG.
Referring to (b), instead of the concave groove 33, the pair of clampers 23 and 24, which are vertically opposed to each other, are movably fitted to the concave groove 35 in the optical axis direction. A configuration in which a convex portion is provided is adopted.

FIG. 10A is a perspective view of the laser unit according to the sixth embodiment of the present invention as viewed from the bottom and front sides.
FIG. 0 (b) is a perspective view of the laser unit of the sixth embodiment viewed from the plane side and the back side.
On the flat side surface 11b of the package body 11 orthogonal to the optical axis of the emitted laser light in the laser unit LU, a concave groove 38 for mounting adjustment is provided so as to extend in a direction orthogonal to the optical axis. Configuration.

The configuration of the third embodiment of the laser unit mounting / adjusting device according to the present invention for mounting the laser unit LU of the sixth embodiment on an optical pickup is not shown, but is basically shown in FIGS. Is different from that of the apparatus shown in FIG. 1 in that a pair of clampers 23 and 24 installed facing each other up and down is provided with a concave groove that fits into each concave groove 38.

If the laser unit LU of the sixth embodiment is mounted on an optical pickup by the laser unit mounting / adjusting device of the third embodiment, the same as in the above embodiment,
Since the force of holding and nipping by the two clampers 23 and 24 is not applied to the package body in the optical axis direction of the emitted laser light from the package body 11, the front and side surfaces of the package body 11 and the optical axis direction during the mounting adjustment are adjusted. The positional relationship in the optical axis direction between the diffraction grating 15 or the laser element 12 and the multi-segmented light receiving element 13 installed on the inner back side can be eliminated, and an excessive force is applied during adjustment as in the conventional example. To generate an offset between the tracking error signal and the focus error signal,
As a result, the problem that accurate adjustment cannot be performed can be solved.

Further, in this embodiment, since the concave groove 38 extends long on the flat side surface 11a of the package body 11, the laser unit LU can be accurately and parallel clamped in this extending direction. As in the above-described embodiment, the rotation of the laser unit LU can be adjusted around the emission of the laser light, and the laser unit LU does not cause stress in the optical axis direction, and highly reliable adjustment can be performed. Will be possible.

As a modification of the sixth embodiment of the laser unit LU, a portion other than the flat side surface 11a of the package body 11 orthogonal to the optical axis of the emitted laser beam in the laser unit LU is provided. It is conceivable to provide a concave groove portion or a convex ridge portion for mounting adjustment so as to extend in a direction perpendicular to the direction. Further, corresponding to this modification, the configuration of the laser unit mounting / adjusting device according to the third embodiment Also, the ridges or concave grooves are provided in the clampers 23 and 24.

The functions and effects of the above embodiments can be further improved by appropriately combining the structures of the above embodiments.

[0042]

As described above, according to the laser unit according to the present invention, the working force at the time of mounting adjustment is applied in a direction orthogonal to the optical axis of the package. It is possible to prevent the application of stress in the optical axis direction of the optical components and the occurrence of misalignment during operation, and also to accurately adjust the package in which the electrodes are installed on the side opposite to the laser beam emission side. Can be.

According to the laser unit mounting apparatus of the present invention, the adjustment can be performed while holding and holding the package with the clamper, and the holding and holding force of the clamper is in the direction orthogonal to the optical axis of the package. In addition, it is possible to prevent the application of stress in the optical axis direction of the optical component member and the occurrence of displacement, etc. by the conventional adjustment work, and furthermore, the clamping and holding of the package by the clamp are performed according to the specification. It can be in a proper state.

[Brief description of the drawings]

FIG. 1 is a perspective view of a laser unit according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a cross section of a part of the laser unit according to the first embodiment of the present invention;

FIG. 3 shows a first example of the laser unit mounting / adjusting device of the present invention.
Overall perspective view of the embodiment

FIG. 4 is an exploded perspective view of a main part of the first embodiment of the laser unit mounting / adjusting device.

FIG. 5 is a perspective view of a laser unit according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a laser unit according to a third embodiment of the present invention.

FIG. 7 is a perspective view of a laser unit according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of a laser unit according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of a laser unit according to a modification of the fifth embodiment of the present invention.

FIG. 10 is a perspective view of a laser unit according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view of an example of a conventional laser unit.

FIG. 12 is a perspective view showing a part of an optical pickup on which the laser unit of FIG. 11 is mounted.

FIG. 13 is an explanatory view showing a state in which adjustment is performed using a general flathead screwdriver with the conventional package shown in FIG. 11 as a jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Package main body 12 Laser element 13 Multi-segment light receiving element 14 Metal terminal 15 Diffraction grating 16 Concave part 22 Housing 23, 24 Clamper 23a, 24a Clamp pin 30, 31 Convex part 32 Convex part 33 Concave groove 34, 35, 38 Concave groove

Claims (6)

[Claims] 1. A laser unit comprising: a light emitting unit for emitting a laser beam; and a diffraction grating for separating the laser beam for detecting a tracking error signal and a focus error signal. A laser unit characterized in that a convex portion or a concave portion for mounting adjustment is provided on a side surface of the package body that is orthogonal to the package. 2. A laser unit comprising: a light emitting unit for emitting a laser beam; and a diffraction grating for separating the laser beam for detecting a tracking error signal and a focus error signal. A laser unit characterized in that a protrusion or a recess for mounting adjustment is provided on a side surface of the package body which is orthogonal to and extends in a direction parallel to the optical axis. 3. A laser unit comprising: a light emitting means for emitting laser light; and a diffraction grating for separating laser light for detecting a tracking error signal and a focus error signal. A laser unit characterized in that a protrusion or a recess for mounting adjustment is provided on a side surface of the package body perpendicular to the optical axis so as to extend in a direction perpendicular to the optical axis. 4. A laser unit mounting apparatus for mounting the laser unit according to claim 1 on an object to be mounted, wherein mounting adjustment is provided on a side surface of a package body orthogonal to an optical axis of emitted laser light in the laser unit. A pair of clampers provided with a concave portion that fits into a convex portion for use or a convex portion that fits into a concave portion for use in mounting provided on the side surface, and performs mounting adjustment while clamping the package body with the clamper. A laser unit mounting device characterized in that it is configured as described above. 5. A laser unit mounting apparatus for mounting the laser unit according to claim 2 on an object to be mounted, comprising: a side surface of a package body orthogonal to an optical axis of emitted laser light in the laser unit; A concave portion that fits into a mounting adjustment convex portion provided to extend in a direction parallel to the projection, or a convex portion that fits into a mounting adjustment concave portion provided on the side surface is positioned with respect to the optical axis. A pair of clampers provided so as to extend in a direction parallel to each other, and the mounting is performed while holding the package body movably with respect to the optical axis by the clampers. Unit mounting device. 6. A laser unit mounting apparatus for mounting the laser unit according to claim 3 on an object to be mounted, comprising: A concave portion that fits into a mounting adjustment convex portion provided to extend in a direction orthogonal to the projection, or a convex portion that fits into a mounting adjustment concave portion provided on the side surface is provided with respect to the optical axis. A pair of clampers provided to extend in a direction orthogonal to the
A laser unit mounting apparatus, wherein mounting is adjusted while clamping a package body by a clamper.