JP3375240B2 - Optical head device and method of adjusting its assembly - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head device for controlling the position of an objective lens in the tracking direction.

[0002]

2. Description of the Related Art An optical disc player optically reads recorded information on a rotationally driven optical disc. At this time, the position of the objective lens is controlled in the tracking direction by the optical head device in order to read the recorded information on the optical disk well.

A conventional example of such an optical head device 1 will be described below with reference to FIG. In the figure, the focus direction is displayed as Fo and the tracking direction is displayed as Tr. Further, hereinafter, a direction orthogonal to the focus direction and the tracking direction is referred to as a tangential direction for convenience sake, and is shown as Ta in the drawing.

At a position facing the optical disc 2 from the focus direction, an objective lens 3 supported movably in a tracking direction with respect to a head body (not shown), and a fixed mirror 4 fixed to the head body. However, they are arranged in order. Since the fixed optical system 5 fixed to the head body is arranged at a position facing the fixed mirror 4 in the tangential direction, the fixed optical system 5 and the fixed mirror 4 are relatively stationary. It is located in.

The fixed optical system 5 has a semiconductor laser 6 which is a light emitting element, and a collimator lens 7, a beam splitter 8 and a quarter wavelength plate 9 are arranged on the optical axis of the semiconductor laser 6. They are arranged in order. The quarter-wave plate 9 faces the fixed mirror 4, and an imaging lens 10 and a light receiving element 11 are sequentially arranged in the reflected light path of the beam splitter 8.

In the optical head device 1 having such a structure, the light beam emitted from the semiconductor laser 6 is deflected in the focusing direction by the fixed mirror 4, converged by the objective lens 3 and made incident on the track of the optical disc 2. The light beam reflected in the focus direction by the optical disc 2 is converged by the objective lens 3 and is deflected by the fixed mirror 4. This light flux is deflected by the beam splitter 8 and read by the light receiving element 11 to detect a tracking error. By controlling the position of the objective lens 3 in the tracking direction in response to the detected tracking error, the position of the light beam irradiated on the optical disc 2 is adjusted on the track. Therefore, when recording information on the optical disc 2,
This information can be satisfactorily recorded on the track, and when reproducing the information on the optical disc 2, the information can be satisfactorily reproduced from the track.

[0007]

In the above-described optical head device 1, the objective lens 3 is tracking-controlled so that its imaging position follows the track of the optical disk 2.

However, the fixed optical system 5 is replaced by the optical head device 1.
If only the objective lens 3 is moved by tracking with the objective lens 3 fixed, the optical axis shift of the optical axis of the light beam incident on the objective lens 3 from the fixed optical system 5 occurs. When the optical head device 1 detects the tracking error by the push-pull method, the optical axis shift becomes a DC (Direct Current) offset of the detection signal, which deteriorates the tracking control accuracy.

Further, as shown in FIG. 21, since the intensity of the laser light is higher in the center and weaker in the periphery, the intensity of the light beam emitted from the objective lens 3 to the optical disc 2 decreases when the optical axis shift occurs. Therefore, when the information is recorded on the optical disc 2, the information cannot be stably recorded on the track, and when the information on the optical disc 2 is reproduced, the information cannot be accurately reproduced from the track. Moreover, these problems occur regardless of the tracking error detection method.

An optical head device that solves such a problem is disclosed in Japanese Patent Application Laid-Open No. 4-14628. In this optical head device, as shown in FIG. 22, the objective lens 3 is rotatably supported substantially parallel to the tracking direction,
A first mirror 4 for deflecting a light beam incident in the focus direction from the optical disc 2 through the objective lens 3 in the tangential direction, and a light beam incident in the tangential direction from the first mirror 4 for deflecting in the focus direction and fixed optics And a second mirror 8 which is incident on the system 5. The optical axis center between the second mirror 8 and the fixed optical system 5 is the objective lens 3.
The objective lens 3, the first mirror 4, and the second mirror 8 rotate integrally with each other.

In this optical head device, the objective lens 3, the first mirror 4 and the second mirror 8 are integrally rotated, and the fixed optical system 5 is located on the optical axis of the second mirror 8. There is no optical axis deviation in the light beam incident on the fixed optical system 5. However, in this case, since the second mirror 8 and the fixed optical system 5 are arranged in the focus direction, it is difficult to downsize the optical head device in the direction perpendicular to the optical disc 2.

In the mirror / lens translation type optical head device, the optical axis shift does not occur because the objective lens and the reflecting mirror are moved together. However, since the objective lens is supported by a spring so as to be displaceable in the focus direction with respect to the reflecting mirror, the objective lens easily resonates during the tracking operation. Further, this is structurally not applicable to an optical head device that performs tracking by rotating an objective lens.

For example, in an optical head device of a mirror / lens translation type, it is possible to rotate the reflecting mirror together with the objective lens. However, in this case, the optical axis of the light beam incident on the objective lens is also inclined and the condensing performance is improved. As a result, the spot irradiated on the optical disk deteriorates.

[0014]

According to another aspect of the present invention, there is provided an optical head device, wherein an objective lens arranged to face an optical disk is mounted on a lens holder, and the lens holder is mounted on a head base in a tracking direction and a focusing direction. A fixed optical system that movably supports and emits laser light in the tracking direction is provided, and a movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is provided. A fixed mirror for deflecting a light beam incident from the lens in the focus direction to be incident on the objective lens is mounted on the head base, and a movable mirror support mechanism for displaceably supporting the movable mirror and mounting it on the lens holder is provided. Movable mirror fixing means for fixing the displaceable movable mirror to the lens holder is provided. Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover,
Since the angle of the movable mirror can be adjusted independently, for example, even if the optical axis direction of the objective lens is adjusted, the optical axis shift can be prevented.

An optical head device according to a second aspect of the invention is
An objective lens arranged to face the optical disc is mounted on a lens support member so as to be rotatable around a principal point, an aperture for shaping the outer shape of a light beam is formed on the lens support member, and the lens support member is orthogonal to the focus direction. Mounted on a lens holder so that it can move in any direction, the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction, and a fixed optical system for emitting laser light in the tracking direction is provided. A movable mirror that deflects an incident light beam in a direction orthogonal to the focus direction and the tracking direction is mounted on the lens holder, and a fixed mirror that deflects the light beam incident from the movable mirror in the focus direction and makes the fixed lens incident on the objective lens. Mounted on the head base, the movable and rotatable objective lens is attached to the lens holder. Provided lens fixing means for fixing.
Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the position and angle of the objective lens can be adjusted independently, the optical axis shift of the objective lens can be corrected together with the optical axis direction.

An optical head device according to a third aspect of the invention is
The objective lens, which is placed opposite to the optical disk, is mounted on the lens holder so that it can rotate about the principal point, and this lens holder is supported by the head base so that it can be displaced in the tracking direction and the focus direction, and emits laser light in the tracking direction. A fixed mirror is provided on the lens holder, and a movable mirror that deflects the light beam incident from the fixed optical system in the direction orthogonal to the focusing direction and the tracking direction is mounted on the lens holder. A fixed mirror that deflects the light and makes it enter the objective lens is attached to the head base, and lens fixing means for fixing the rotatable objective lens to the lens holder is provided. Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the angle of the objective lens can be adjusted independently, the optical axis direction of the objective lens can be corrected.

An optical head device according to a fourth aspect of the invention is
An objective lens arranged to face the optical disc is mounted on a lens holder, the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction, and a fixed optical system for emitting a laser beam in the tracking direction is provided.
A movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is deflected in the focus direction to the objective lens. A fixed mirror for making the light incident is provided, and a fixed mirror support mechanism is provided for rotatably supporting the fixed mirror on the head base in a rotation direction in which an axis passes through the center of the reflection surface of the fixed mirror in the tracking direction. Fixed mirror fixing means for fixing the fixed mirror to the head base is provided. Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the angle of the fixed mirror can be adjusted independently, even if the direction of the movable mirror is changed by adjusting the optical axis direction of the objective lens, the optical axis shift of the objective lens can be prevented.

According to a fifth aspect of the present invention, there is provided an optical head device according to the fourth aspect, wherein the fixed mirror support mechanism is movably supported on the head base in a direction orthogonal to the tracking direction and the focus direction. A mechanism is provided, and a support mechanism fixing means for fixing the position of the movable fixed mirror support mechanism to the head base is provided. Therefore, since the angle and the position of the fixed mirror can be adjusted independently, even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, it is possible to prevent the optical axis deviation from occurring in the objective lens. Also, the optical axis direction of the objective lens can be favorably maintained.

An optical head device according to a sixth aspect of the invention is
An objective lens arranged to face the optical disc is mounted on a lens holder, the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction, and a fixed optical system for emitting a laser beam in the tracking direction is provided.
A movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is deflected in the focus direction to the objective lens. A fixed mirror for incidence is provided, and a movable support member is mounted on the head base so as to be movable in a direction orthogonal to the tracking direction and the focus direction. The movable support member is attached to the head base in the moving direction by a moving biasing member. It is urged and positioned in the opposite direction by a moving holding member, and a cylindrical concave surface whose axis passes through the center of the reflecting surface of the fixed mirror in the tracking direction is formed on the moving supporting member, and is rotatably supported by this concave surface. The fixed mirror is mounted on a rotation support member having a cylindrical convex surface, and the rotation support member is attached to the movement support member. It was positioned in the opposite direction by rotating the holding member with the rotation urging member member biases the rotating direction. Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the angle and position of the fixed mirror can be adjusted independently,
Even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, the optical axis shift of the objective lens can be prevented from occurring, and at the same time, the optical axis direction of the objective lens can be favorably maintained.

An optical head device according to a seventh aspect of the invention is
An objective lens arranged to face the optical disc is mounted on a lens holder, the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction, and a fixed optical system for emitting a laser beam in the tracking direction is provided.
A movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is deflected in the focus direction to the objective lens. A fixed mirror for making the light incident is provided, and the fixed mirror is mounted on a rotary support member having support shafts that pass through the center of the reflection surface of the fixed mirror in the tracking direction and are projected on both sides. A movable support member having a convex portion for rotatably supporting is mounted on the head base so as to be movable in a direction orthogonal to the tracking direction and the focus direction, and the movable base member is fixed to the head base. Fixing means is provided, and the rotation support member is urged to the movement support member in the rotation direction by the rotation urging member and the rotation holding member is used. It has been positioned in the opposite direction. Therefore,
A light beam emitted in the tracking direction from the fixed optical system is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror and is incident on the optical disc through the objective lens. It Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the angle and the position of the fixed mirror can be adjusted independently, even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, it is possible to prevent the optical axis shift of the objective lens, and at the same time, The optical axis direction of the objective lens can also be favorably maintained.

An optical head device according to an eighth aspect of the invention is
An objective lens arranged to face the optical disc is mounted on a lens holder, the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction, and a fixed optical system for emitting a laser beam in the tracking direction is provided.
A movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is deflected in the focus direction to the objective lens. A fixed mirror for incidence is provided, and a pair of fixed mirror support convex portions for supporting the fixed mirror displaceably from both sides in the tracking direction are projectingly provided on the head base, and the fixed mirror is fixed to the fixed mirror support convex portion. A fixing member fixing means was provided. Therefore, the light beam emitted from the fixed optical system in the tracking direction is deflected by the movable mirror in a direction orthogonal to the focus direction and the tracking direction, and this light beam is deflected in the focus direction by the fixed mirror to be passed through the objective lens to the optical disc. It is incident. Since the movable mirror moves together with the objective lens, the optical axis shift of the light beam due to the tracking movement of the objective lens does not occur. Moreover, since the angle and the position of the fixed mirror can be adjusted independently, even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, it is possible to prevent the optical axis shift of the objective lens, and at the same time, The optical axis direction of the objective lens can also be favorably maintained.

According to a ninth aspect of the present invention, there is provided an optical head device assembling / adjusting method, wherein an objective lens arranged to face an optical disk is attached to a lens holder, and the lens holder is displaceable in a tracking direction and a focusing direction on a head base. A fixed optical system that emits laser light in the tracking direction, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction. A fixed mirror that deflects the light beam to be incident on the objective lens by deflecting it in the focus direction is mounted on the head base, and the movable mirror is mounted on the lens holder by a movable mirror support mechanism so that the movable mirror is movable. Hold the mirror at an appropriate angle with respect to the head base, and in this state, hold the lens holder. It was adjusted in the proper direction relative to the head base, and to fix the movable mirror to the lens holder after completion of the adjustment. Therefore, even if the direction of the lens holder is displaced in order to adjust the optical axis direction of the objective lens, the direction of the movable mirror can be properly maintained independently of this.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG.
The following description is based on FIG. Regarding the optical head device 12 illustrated here, the same parts as those of the optical head device 1 described above as a conventional example are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 12 of the present embodiment.
Then, as shown in FIG. 2, an objective lens 3 that is movable in the tracking direction and a fixed mirror 4 that is fixedly arranged are sequentially arranged at a position facing the optical disc 2 in the focus direction. The movable mirror 13 is provided at a position facing the fixed mirror 4 in the tangential direction.
The fixed optical system 5 is arranged at a position facing the movable mirror 13 in the tracking direction.

More specifically, as shown in FIG. 3, the fixed optical system 5 and the fixed mirror 4 are fixed to one head base 14, and a holder support portion 15 projects from the head base 14. It is set up. This holder support 15
A tangential adjustment member 16 is rotatably mounted in the tangential direction, and a tracking adjustment member 17 is rotatably mounted in the tangential adjustment member 16.

The tracking adjusting member 17 is provided with four spring shafts 18 projecting in the tangential direction, and the lens holder 19 is elastically supported by these spring shafts 18. Since each of the spring shafts 18 is bendable, the lens holder 19 can be displaced parallel to the focus direction and the tracking direction. Since the objective lens 3 is mounted on the upper part of the lens holder 19 and the movable mirror 13 is mounted on the lower part of the lens holder 19, the movable mirror 13 and the objective lens 3 are integrally formed. It is free to move.

As shown in FIG. 1, the movable mirror 13
Is movably supported on the lens holder 19 by a mold member 20 which is a movable mirror support mechanism, and is fixed to the lens holder 19 by an adhesive 21 which is a movable mirror fixing means. More specifically, as shown in FIG. 4, the mold member 20 is formed such that the central portion is elongated and can be freely curved, and the end portion is the lens when the movable mirror 13 is attached to the tip portion. Holder 19
Be attached to. The lens holder 19 is formed with three-stage recesses 22 in which the movable mirror 13 is arranged together with the mold member 20. An opening 23 is formed at one edge of the recess 22.
The movable mirror 13 is fixed to the lens holder 19 together with the molding member 20 by the adhesive 21 injected into the concave portion 22 from 3.

The mirror adjusting jig 31 for adjusting the angle of the movable mirror 13 as described above is also provided exclusively. That is, as shown in FIG. 5, engagement holes (not shown) are formed at predetermined positions on the bottom surfaces of the fixed optical system 5 and the head base 14, and the engagement holes can be freely engaged and disengaged. An engaging pin 32 that engages with is projected from a jig base 33 of the mirror adjusting jig 31. The optical head device 1 is
A through hole 24 is formed at a position of the head base 14 that communicates with the movable mirror 13, and an angle fitting 34 is arranged at a position where the through hole 24 is loosely inserted.

The angle metal fitting 34 is mounted on the jig base 33 so as to be movable in the direction of contact with and away from the movable mirror 13, and is biased by the coil spring 35 in the direction of pressing and holding the movable mirror 13. ing. The tip portion that comes in contact with and separates from the movable mirror 13 is formed in a U shape, and effectively holds the surface of the movable mirror 13, but does not interfere with the optical path of its reflection.

With such a structure, in the optical head device 12 of this embodiment, the light beam emitted from the fixed optical system 5 in the tracking direction is deflected by the movable mirror 13 in the tangential direction. The light beam deflected in the tangential direction is deflected in the focus direction by the fixed mirror 4, converged by the objective lens 3 and imaged on the track of the optical disc 2.

The light beam reflected by the optical disk 2 in the focus direction passes through the objective lens 3 and is then deflected by the fixed mirror 4 in the tangential direction. The light beam deflected in the tangential direction by the fixed mirror 4 is deflected in the tracking direction by the movable mirror 13 and read by the fixed optical system 5.

Since a tracking error is detected from the reading result of the fixed optical system 5, the lens holder 19 is positionally controlled in the tracking direction in response to the tracking error. As a result, the objective lens 3 mounted on the lens holder 19 follows the track of the optical disc 2, and the information recorded on this track is read by the fixed optical system 5.

At this time, the optical head device 1 of the present embodiment
2, when the objective lens 3 moves in the tracking direction as described above, the optical axis of this objective lens 3 is fixed mirror 4
Although the movable mirror 13 also moves in parallel with the objective lens 3 in the tracking direction with respect to the optical axis of the light flux incident from, the light flux incident from the movable mirror 13 to the fixed mirror 4 is also moved. Objective lens 3
Therefore, the optical axis shift does not occur in the light flux that enters the objective lens 3 from the fixed optical system 5 via the mirrors 13 and 4 in the same manner as the above.

Therefore, in the optical head device 12 of the present embodiment, even when the tracking error is detected by the push-pull method, the DC offset does not occur in this detection signal, so that the tracking control can be performed with good accuracy. I can do it. Further, since the light amount of the light beam applied to the optical disc 2 does not change due to the intensity distribution of the laser light and the light amount of the light beam detected by the fixed optical system 5 does not change, recording or reproducing of information on the optical disc 2 is performed. Can be executed with high precision.

The movement of the lens holder 19 in the tracking direction as described above is a tracking operation for causing the objective lens 3 to follow a slight displacement of the track due to the rotation of the optical disk 2, and a seek for moving between tracks of the optical disk 2. In operation, a head transport mechanism (not shown) that movably supports the head base 14 transports the entire optical head device 12 in the tracking direction.

Then, the optical head device 1 of the present embodiment
In No. 2, the optical axis direction of the objective lens 3 is adjusted in the assembling process, which is performed by the rotation of the tangential adjustment member 16 and the tracking adjustment member 17.
By such adjustment, the objective lens 3 is moved to the lens holder 19
Since it rotates with the tangential direction and the tracking direction together, the angles in these directions are adjusted.

In this case, since the angle of the movable mirror 13 changes together with the lens holder 19, the light beam reflected by the movable mirror 13 will cause an optical axis shift in the objective lens 3 as it is. In the optical head device 12 of FIG.
Since the angle can be adjusted, the above optical axis deviation does not occur.

A method for adjusting the members of the optical head device 12 will be described below with reference to FIG. First, the optical head device 12 is temporarily assembled and set on the mirror adjusting jig 31. The temporary assembly of the optical head device 12 is such that two adjusting members 16 and 17 are attached to a holder supporting portion 15 so as to be rotatable in each direction, and a movable mirror 13 is attached to a lens holder 19 and a molding member 20. It is in a state where it is displaceably mounted only by itself and is not fixed by the adhesive 21. When the optical head device 12 in such a state is set on the mirror adjusting jig 31, the angle fitting 34 of the mirror adjusting jig 31 is set.
The elastic force of the coil spring 35 presses and holds the movable mirror 13 of the optical head device 12 at an appropriate angle.

In this state, the laser light emitted from the fixed optical system 5 is transmitted to the objective lens 3, and the image formation position of this laser light is monitored by a CCD (Charge Coupled Device) microscope (not shown). Adjustment member 16, 17
Of the objective lens 3 together with the lens holder 19
To the proper direction. At this time, the lens holder 19 rotates together with the objective lens 3 in various directions, but since the movable mirror 13 is held by the angle metal fitting 34, it is not displaced with respect to the head base 14.

That is, since the angles of both the objective lens 3 and the movable mirror 13 are adjusted at the same time by the above adjustment, the adjusting members 16 and 17 are completed at the time when this adjustment is completed.
Is fixed by adhesion or the like to hold the objective lens 3 in an appropriate direction, and the adhesive 21 is injected into the recess 22 of the lens holder 19 through the opening 23 to fix the movable mirror 13 at an appropriate position. In this case, even if the direction of the lens holder 19 is displaced in order to adjust the optical axis direction of the objective lens 3, the direction of the movable mirror 13 can be properly maintained independently of this, so that the optical axis direction of each part is appropriate. Thus, the optical head device 12 having excellent optical characteristics can be obtained.

In the optical head device 12, the optical axis shift of the objective lens 3 is corrected in the assembling process as described above, and the optical axis shift does not occur in the objective lens 3 even if tracking control is executed, so that the fixed optical system is fixed. The intensity of the laser beam emitted by 5 may be the minimum necessary. That is, it is not necessary to increase the output of the laser light source of the fixed optical system 5 unnecessarily, so that the power consumption can be reduced and the life of the parts can be extended.

The lens holder 19 is the head base 1.
Since the movable shaft 13 is supported by the spring shaft 18 so as to be displaceable, the angle metal fitting 34 holds the head base 14 on the jig base 33 of the mirror adjusting jig 31. There is a concern that the lens holder 19 may be displaced. That is, the pressing force of the angle fitting 34 is adjusted so that the lens holder 19 is not displaced, and the mold member 20 is formed to have a hardness that allows the movable mirror 13 to be properly held by this pressing force.

Next, a second embodiment of the present invention will be described with reference to FIG.
And it demonstrates below based on FIG. Regarding the optical head device 41 exemplified here, the same parts as those of the optical head device 12 described above are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 41 of the present embodiment.
Then, as shown in FIG. 6, the spring shaft 18 is directly fixed to the holder support portion 43 protruding from the head base 42, and the movable mirror 13 is formed integrally with the lens holder 44. A lens support member 45 is attached to the lens holder 44, and the objective lens 3 is attached to the lens support member 45.

More specifically, a ring-shaped guide portion 46 is integrally provided on the outer peripheral portion of the objective lens 3, and the objective lens 3 is rotatable around the principal point on the lens support member 45. A hemispherical concave portion 47 for supporting is formed on the upper surface. Since the guide portion 46 is slidably engaged with the concave portion 47, the objective lens 3 is rotatably supported by the lens supporting member 45 about the principal point. In this state, the adhesive 48 as the lens fixing means is provided. It is fixed by.

On the lens support member 45, the recess 4 is formed.
Aperture 4 for shaping the outer shape of the light flux at a position communicating with 7.
9 is formed, and a large diameter through hole 50 communicating with the aperture 49 is formed in the lens holder 44. An annular guide portion 51 is provided on the upper surface of the lens holder 44 so that the lens support member 45 movable in the tracking direction and the tangential direction is
It is fixed by the adhesive 48 inside the guide portion 51. That is, the objective lens 3 is rotatably and movably supported by the lens holder 44 by the lens support member 45, and is fixed to the lens holder 44 by the adhesive 48 in this state.

Further, the lens holder 44 is also provided with a member adjusting jig 61 for positioning the lens supporting member 45. As shown in FIG. 7, the member adjusting jig 61 includes an image sensor 62 and a holder arm. And 63. The image sensor 62 has a large number of light receiving elements 64 arranged two-dimensionally, and detects the position of the light flux transmitted through the aperture 49 of the lens support member 45. A holder portion 65 for holding the lens support member 45 is provided at the tip of the holder arm 63, and the holder arm 63 is controlled to move in the tracking direction and the tangential direction according to the detection result of the image sensor 62.

With such a structure, in the optical head device 41 of the present embodiment as well, similar to the above-described optical head device 12, the light flux emitted from the fixed optical system 5 in the tracking direction is tangentially moved by the movable mirror 13. After being deflected in the direction, the fixed mirror 4 deflects it in the focus direction, and the objective lens 3 converges the optical disc 2.
Is imaged on the track. At this time, since the movable mirror 13 moves in parallel with the objective lens 3 in the tracking direction, the tracking control does not cause the optical axis shift of the objective lens 3.

Therefore, in the optical head device 41 of the present embodiment, even when the tracking error is detected by the push-pull method, the DC offset does not occur in this detection signal, so that the tracking control can be performed with good accuracy. I can do it. Further, since the light amount of the light beam applied to the optical disc 2 does not change due to the intensity distribution of the laser light and the light amount of the light beam detected by the fixed optical system 5 does not change, recording or reproducing of information on the optical disc 2 is performed. Can be executed with high precision.

Then, the optical head device 4 of the present embodiment
In No. 1, the optical axis direction and the optical axis position of the objective lens 3 are adjusted in the assembly process. More specifically, first, the lens support member 45 is movably loaded on the lens holder 44, and as shown in FIG. 7, the optical head device 41 in the temporarily assembled state is set on the member adjusting jig 61. In this state, the laser light emitted from the fixed optical system 5 is supplied to the lens support member 45.
To the aperture 49 of the laser beam, and while the optical axis position of the laser beam is monitored by the image sensor 62, the lens support member 45 is adjusted by the holder arm 63, and when the position adjustment is completed, the lens support member 45 is fixed by the adhesive 48. It is fixed to the lens holder 44.

Next, the objective lens 3 is rotatably mounted on the lens supporting member 45 fixed to the lens holder 44, and the optical head device 41 in the temporarily assembled state is mounted on a lens adjusting jig (not shown). set. Fixed optical system 5 in this state
The laser light emitted from is transmitted to the objective lens 3,
The objective lens 3 is angle-adjusted while monitoring the image formation position of the laser beam with a CCD microscope, and when the angle adjustment is completed, the objective lens 3 is fixed to the lens support member 45 with an adhesive 48.

By such adjustment, the objective lens 3 is arranged at an appropriate position and at an appropriate angle, and since the movable mirror 13 and the like are not displaced by this adjustment, the optical head device 41 having good optical characteristics can be obtained. Particularly, in the above-described optical head device 41, since the light flux is shaped by the aperture 49 of the lens support member 45, the light spot on which the objective lens 3 forms an image is formed in a good shape, and the information on the optical disc 2 can be more favorably formed. Recording and playback can be performed. Since such an aperture 49 is formed on the lens support member 45 and does not displace from the optical axis position of the objective lens 3, the aperture 49 is formed at an appropriate position with a simple structure.

Further, in the above-mentioned optical head device 41,
Since the objective lens 3 is movable in the direction orthogonal to the optical axis by the lens support member 45, not only the angle of the optical axis but also the position can be adjusted, and the degree of freedom of the adjustment is good. However, such adjustment of the position of the optical axis is not so important as adjustment of the angle, and it may be practically sufficient within the range of processing accuracy of parts. In such a case, as shown in FIG.
The lens holder 71 is provided with a hemispherical concave portion 72 that rotatably supports the objective lens 3 around the principal point. The concave portion 72 rotatably supports the objective lens 3 around the principal point. Can be fixed to the lens holder 71 by an adhesive (not shown) which is a lens fixing means.

Although a hemispherical guide member 73 is attached to the objective lens 3 in the figure, if such a guide member 73 is provided, the objective lens 3 can be rotated more favorably.
Can be placed in the recess 72. Further, in the figure, since the aperture 74 is formed in the guide member 73,
Again, the aperture 74 is formed at a proper position with a simple structure. However, since this aperture 74 is displaced while adjusting the angle of the objective lens 3 although it is weak, it is preferable to form the through hole 75 of the lens holder 71 in the aperture when this becomes a problem.

Next, a third embodiment of the present invention will be described with reference to FIG.
11 to 11 will be described below. Regarding the optical head device 81 exemplified here, the same parts as those of the optical head device 12 described above are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 81 according to the present embodiment.
The lens holder 19 is rotatably attached to the head base 82 by the adjusting members 16 and 17 in the tracking direction and the tangential direction. The fixed mirror 4 is attached to the head base 82 in the tangential direction. It is rotatably attached to.

More specifically, the fixed mirror 4 is fixed to the rotation support member 83, and the rotation support member 83 is rotatably mounted on the head base 82. Therefore, on the upper surface of the head base 82, a cylindrical concave portion 85 whose axis is located at the reflection surface center 84 of the fixed mirror 4 is formed, and a convex portion 86 having a shape corresponding to the concave portion 85 is formed.
Is formed on the lower surface of the rotation support member 83. The reflection surface center 84 of the fixed mirror 4 referred to here means the center point where the optical axis is located when a light beam is incident on the reflection surface from the fixed optical system 5.

As described above, the rotation support member 83 is rotatably supported by the head base 82. One end of the rotation support member 83 is biased downward by the leaf spring 87, The other end is held by a screw 88 penetrating the head base 82 from below. That is, the fixed mirror 4 is rotatably supported on the head base 82 by the rotation support member 83 in the rotation direction in which the axis passes through the reflection surface center 84 in the tracking direction, and is fixed here. A mirror support mechanism 89 is formed.
Then, such a rotation support member 83 is used for the leaf spring 87.
Since it is positioned on the head base 82 by the screw 88 and the screw 88, a fixed mirror fixing means 90 for fixing the movable fixed mirror 4 to the head base 82.
Are formed.

In such a structure, in the optical head device 81 of the present embodiment as well as the optical head device 12 described above, since the movable mirror 13 moves in parallel with the objective lens 3 in the tracking direction, the objective is controlled by the tracking control. The optical axis shift of the lens 3 does not occur. Therefore, even when the tracking error is detected by the push-pull method, the DC offset does not occur in the detection signal, and thus the tracking control can be executed with good accuracy. Further, since the light amount of the light beam applied to the optical disc 2 does not change due to the intensity distribution of the laser light and the light amount of the light beam detected by the fixed optical system 5 does not change, recording or reproducing of information on the optical disc 2 is performed. Can be executed with high precision.

Then, the optical head device 8 of the present embodiment
1, the lens holder 19 can be rotated in the tracking direction and the tangential direction to adjust the optical axis direction of the objective lens 3 in the assembling process, as in the optical head device 12 described above. When the lens holder 19 is rotated like this, the movable mirror 13 is displaced. In this case, an optical axis shift occurs in the light beam entering the objective lens 3 from the movable mirror 13 via the fixed mirror 4, but this optical axis shift is eliminated by adjusting the angle of the fixed mirror 4. This will be sequentially described below.

First, when the objective lens 3 is rotated together with the lens holder 19 in the tracking direction, the optical axis of the light beam incident on the fixed mirror 4 from the movable mirror 13 is set to the axis Y, as shown in FIG. When the lens holder 19 is rotated in the tangential direction, this corresponds to rotation with the optical axis of the light beam entering the movable mirror 13 from the fixed optical system 5 as the axis Z. When the movable mirror 13 is slightly rotated by such two axes, the light flux entering the fixed mirror 4 from the movable mirror 13 is displaced in the direction of the axis X in the focus direction, as shown in FIG. The light flux entering the objective lens 3 from the fixed mirror 4 is displaced in the direction of the axis Y.

Therefore, the fixed mirror 4 corresponding to this displacement.
Axis Z that passes through the reflecting surface center 25 in the tracking direction
When a is rotated about the rotation center, even if the light beam entering the fixed mirror 4 from the movable mirror 13 is displaced in the direction of the axis X, the light beam entering the objective lens 3 from the fixed mirror 4 is appropriate. The position is corrected and the optical axis shift of the objective lens 3 is eliminated.

In this case, even if the direction of the lens holder 19 is displaced in order to adjust the optical axis direction of the objective lens 3, the angle of the fixed mirror 4 can be adjusted independently of this, so that the optical axis shifts to the objective lens 3. It is possible to obtain the optical head device 81 that does not generate In this optical head device 81, the fixed mirror 4 is fixed by the elastic force of the leaf spring 87 and the holding of the screw 88 without using an adhesive or the like. Therefore, this can be freely adjusted even after the product is completed. can do.

When the optical axis shift of the objective lens 3 is corrected by adjusting the angle of the fixed mirror 4 as described above, as shown in FIG. 11, the optical axis direction of the objective lens 3 changes slightly as a result. Will be done. That is, the above-described optical head device 81 is suitable when the processing accuracy of various components is good and the angle adjustment of the objective lens 3 and the fixed mirror 4 is fine.

However, there are cases where the processing accuracy of the parts is not sufficient and strict optical characteristics are required. An optical head device 101 that solves such a problem will be described below with reference to FIG. 12 as a fourth embodiment of the present invention. Regarding the optical head device 101 illustrated here, the same parts as those of the optical head device 81 described above are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 10 of the present embodiment.
In FIG. 1, the moving support member 103 is supported by the head base 102 so as to be movable in the tangential direction, and the reflecting surface center 84 of the fixed mirror 4 is supported by the moving support member 103.
A cylindrical concave portion 85 having an axial center is formed therein.
A rotation support member 83 is rotatably arranged in the recess 85, and the rotation support member 83 is positioned by a leaf spring 87 and a screw 88.

That is, since the fixed mirror support mechanism 89 and the fixed mirror fixing means 90 are mounted on the movable support member 103, the support mechanism moving mechanism 104 for movably supporting the fixed mirror support mechanism 89 is formed here. Has been done. The movement supporting member 103 has one end urged in the tangential direction by a coil spring 105 which is a movement urging member, and the other end which is a movement holding member penetrating the head base 102 in the tangential direction.
Since it is held by 06, the support mechanism fixing means 107 for fixing the fixed mirror support mechanism 89 to the head base 102 is formed here.

In such a structure, the optical head device 101 of this embodiment also has the above-mentioned optical head device 81.
Similarly, the lens holder 19 is rotated in the tracking direction and the tangential direction to adjust the optical axis direction of the objective lens 3, but a fixed mirror is provided for the optical axis deviation of the objective lens 3 caused by this angle adjustment. Not only the angle adjustment of 4 but also the position adjustment is executed.

More specifically, as described above, the objective lens 3
When is rotated together with the lens holder 19 in the tracking direction, the light flux incident on the fixed mirror 4 from the movable mirror 13 is displaced in the focus direction. Therefore, the fixed mirror 4 is rotated in the tangential direction in response to this displacement. The direction of the light beam incident on the objective lens 3 is properly adjusted, and in this state, the fixed mirror 4 is moved in the tangential direction to appropriately adjust the position of the light beam incident on the objective lens 3.

In this case, since the optical axis direction and the optical axis position of the light beam incident on the objective lens 3 can be accurately adjusted, good optical characteristics can be realized even if the processing accuracy of various parts is not sufficient. You can In the above-described optical head device 101, one end of the movable support member 103 that movably supports the fixed mirror 4 is biased by the coil spring 105 and the other end is held by the screw 106. The position of the fixed mirror 4 can be easily adjusted by the operation of.

However, the present invention is not limited to the above structure, and the through hole 113 of the head base 112, like the optical head device 111 illustrated in FIG. 13 and FIG.
The movable support member 114 is movably engaged with the head support 112 with a screw 115.
It is also possible to form the support mechanism moving mechanism 116 and the support mechanism fixing means 117 by fixing the support mechanism moving mechanism 116 to the support mechanism moving mechanism 116. In this case, the position adjustment of the movable support member 114 is not so easy as that of the optical head device 101 described above, but the movable support member 114 is adjusted.
Since it can be firmly fixed, reliability and durability can be improved.

Furthermore, FIG. 1 shows a fifth embodiment of the present invention.
This will be described below with reference to FIGS. Regarding the optical head device 121 illustrated here, the same parts as those of the optical head device 111 described above are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 12 of the present embodiment.
Even in No. 1, the movable support member 123 is supported by the head base 122 so as to be movable in the tangential direction, and the rotation support member 124 is supported by the movable support member 123 so as to be rotatable in the tangential direction. Supporting shafts 125 that pass through the reflection surface center 25 of the fixed mirror 4 in the tracking direction are provided on both sides of the rotation supporting member 124 so as to be rotatable about the moving supporting member 123 by the support shafts 125. It is pivotally supported. The arm 1 is provided at the rear of the movement support member 123 and the rotation support member 124.
26 and 127 are respectively provided so as to project, and these arms 1
The coils 26 and 127 are urged in a direction of separation by a coil spring 128, which is a rotation urging member press-fitted in the gap, and are held at regular intervals by screws 129, which are piercing rotation holding members. The moving support member 123 is a screw 131 that penetrates the elongated hole 130 of the head base 122.
Is fixed by the support member fixing means 1 here.
32 is formed.

In such a structure, the optical head device 121 of this embodiment also has the above-mentioned optical head device 11.
As in the case of 1, the lens holder 19 is rotated in the tracking direction and the tangential direction to adjust the optical axis direction of the objective lens 3, but is fixed against the optical axis deviation of the objective lens 3 caused by this angle adjustment. Not only the angle adjustment of the mirror 4 but also the position adjustment is performed. In this case, since the optical axis direction and the optical axis position of the light beam incident on the objective lens 3 can be accurately adjusted, good optical characteristics can be realized even if the processing accuracy of various components is not sufficient.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
This will be described below with reference to FIGS. Regarding the optical head device 141 illustrated here, the same parts as those of the above-described optical head device 121 are denoted by the same names and reference numerals, and detailed description thereof will be omitted.

First, the optical head device 14 of the present embodiment.
In FIG. 1, the head base 142 is provided with a pair of fixed mirror support convex portions 143, and the fixed mirror 4 is fixed between the pair of fixed mirror support convex portions 143 by an adhesive which is a fixed mirror fixing means. . More specifically, a through hole 144 is formed in the fixed mirror support convex portion 143. As shown in FIG. 18, the through hole 144 is formed on the inner surfaces of the fixed mirror support convex portion 143 facing each other. An annular land 145 is formed so as to surround it. The fixed mirror 4 is located between these lands 145,
It is fixed by the adhesive injected from the through hole 144.

Further, the head base 142 as described above is used.
17 is also provided with a mirror adjusting jig 151 for positioning the fixed mirror 4. This mirror adjusting jig 151 is shown in FIG.
Further, as shown in FIG. 19, it has a four-divided light receiving element 152, a temporary mirror fixing device 153, and a vacuum holder 154.

The four-division light receiving element 152 has four light receiving elements 155 arranged in the tangential direction and the tracking direction, and detects the image forming position of the objective lens 3 of the optical head device 141. The temporary mirror fixing device 153 includes a slide pin 156, a main body cylinder 157, and a coil spring 158. The slide pin 156 is movably supported by the main body cylinder 157 so that the slide pin 156 can move in a protruding direction by the coil spring 158. Being energized. The vacuum holder 154 includes a slide stage 159 that is movable in the tangential direction,
The fixed mirror 4 has a goniometer stage 160 that rotates around the reflection surface center 25 and a holder arm 161 that holds the fixed mirror 4 by suction, and adjusts the angle and position of the fixed mirror 4.

In such a structure, the optical head device 141 of this embodiment also has the above-mentioned optical head device 12.
As in the case of 1, the lens holder 19 is rotated in the tracking direction and the tangential direction to adjust the optical axis direction of the objective lens 3, and the fixed mirror against the optical axis deviation of the objective lens 3 caused by this angle adjustment. Adjust the angle and position of 4.

More specifically, the optical head device 141 is temporarily assembled in a state where the fixed mirror 4 is not assembled, and the fixed mirror 4 is adsorbed by the vacuum holder 154 and held at a predetermined position of the mirror adjusting jig 151. The optical head device 141 in the temporarily assembled state is set on the mirror adjusting jig 151 so that the fixed mirror 4 is positioned in the gap between the fixed mirror support convex portions 143.

In this state, as described above, the correction members 16, 1
When the objective lens 3 is displaced together with the lens holder 19 by rotating 7 to adjust the optical axis direction, the movable mirror 13 is also displaced by this adjustment, and the position of the optical axis of the light beam incident on the objective lens 3 from the fixed mirror 4. And the direction also changes. This change can be detected by the difference signal or the sum signal of the two light receiving elements 155 of the four-division light receiving element 152, and accordingly, the vacuum holder 154 appropriately adjusts the position and angle of the fixed mirror 4.

When this adjustment is completed, the mirror temporary fixing device 15
Since the third slide pin 156 is press-fitted into the through hole 144 of the fixed mirror support convex portion 143 of the optical head device 141, the fixed mirror 4 is temporarily fixed while being pressed against the other fixed mirror support convex portion 143. Therefore, since the fixed mirror 4 is fixed by injecting an adhesive into the through hole 144 of the fixed mirror support convex portion 143, the slide pin 156 is removed after the fixing is completed and the other fixed mirror support convex portion 143 is penetrated. If the adhesive is also injected into the hole 144, the fixed mirror 4 is surely fixed at an appropriate position.

In the above-described optical head device 141, since the optical axis direction and the optical axis position of the light beam incident on the objective lens 3 can be adjusted accurately, good optical performance is achieved even if the processing accuracy of various parts is not sufficient. The characteristics can be realized.
Moreover, the structure of the optical head device 141 is extremely simple, and since the number of parts thereof is small, the size and weight can be reduced.

[0084]

In the optical head device according to the first aspect of the present invention, the objective lens, which is arranged to face the optical disk, is mounted on the lens holder, and the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction. Then
A fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from this fixed optical system in a direction orthogonal to the focus direction and the tracking direction is provided. A fixed mirror that deflects the light to enter the objective lens is mounted on the head base, and a movable mirror support mechanism that displaceably supports the movable mirror and mounts it on the lens holder is provided, and the displaceable movable mirror is fixed to the lens holder. Since the movable mirror is moved integrally with the objective lens by providing the movable mirror fixing means, it is possible to prevent the optical axis of the light beam from being displaced due to the tracking movement of the objective lens. Can be adjusted independently, so even if the optical axis direction of the objective lens is adjusted, optical axis deviation does not occur. Unisuru you can, optical property can be obtained a good optical head device.

In the optical head device according to the second aspect of the present invention, the objective lens arranged so as to face the optical disk is mounted on the lens supporting member so as to be rotatable about the principal point, and the outer shape of the light flux is formed on the lens supporting member. An aperture is formed, a lens support member is mounted on a lens holder so that it can move in a direction orthogonal to the focus direction, and this lens holder is supported by a head base so as to be displaceable in the tracking direction and the focus direction. A fixed optical system that emits light is provided to the lens holder, and a movable mirror that deflects the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is directed in the focus direction. A fixed mirror that deflects and makes it enter the objective lens is mounted on the head base, and is movable and rotatable. Since the movable mirror is moved integrally with the objective lens by providing the lens fixing means for fixing the object lens to the lens holder, it is possible to prevent the optical axis shift of the light beam due to the tracking movement of the objective lens. Moreover, since the position and angle of the objective lens can be adjusted independently, the optical axis shift of the objective lens can be corrected together with the optical axis direction, and an optical head device having good optical characteristics can be obtained.

In the optical head device according to the third aspect of the present invention, the objective lens arranged to face the optical disk is mounted on the lens holder so as to be rotatable about the principal point, and the lens holder is mounted on the head base in the tracking direction and the focus direction. A fixed optical system that movably supports the laser beam in the tracking direction is provided, and a movable mirror that deflects the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction is provided in the lens holder. By mounting a fixed mirror, which is mounted and deflects the light beam incident from the movable mirror in the focus direction and makes it enter the objective lens, by providing the lens fixing means for fixing the rotatable objective lens to the lens holder. Since the movable mirror is moved integrally with the objective lens, the light flux caused by the tracking movement of the objective lens Since it is possible to prevent the optical axis deviation and adjust the angle of the objective lens independently, it is possible to correct the optical axis direction of the objective lens and to obtain an optical head device with good optical characteristics. it can.

In the optical head device according to the fourth aspect of the present invention, the objective lens arranged to face the optical disk is mounted on the lens holder, and the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction,
A fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder and is incident from the movable mirror. A fixed mirror that deflects the light beam in the focusing direction and makes it enter the objective lens is provided. Since the movable mirror is moved integrally with the objective lens by providing the fixed mirror fixing means for fixing the movable fixed mirror to the head base by providing the mirror support mechanism, the optical axis of the light flux due to the tracking movement of the objective lens. The deviation can be prevented, and the angle of the fixed mirror can be adjusted independently. Even if the direction of the movable mirror is changed by adjusting the optical axis direction of the lens, can prevent the optical axis deviation is generated in the objective lens, optical property can be obtained a good optical head device.

In the optical head device according to the fifth aspect of the present invention, there is provided a support mechanism moving mechanism for movably supporting the fixed mirror support mechanism on the head base in the direction orthogonal to the tracking direction and the focus direction, and the movable fixed mechanism is provided. Support mechanism fixing means for fixing the position of the mirror support mechanism to the head base is provided. Therefore, since the angle and the position of the fixed mirror can be adjusted independently, even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, it is possible to prevent the optical axis deviation from occurring in the objective lens. Also, the optical axis direction of the objective lens can be favorably maintained, and an optical head device having excellent optical characteristics can be obtained.

In the optical head device according to the sixth aspect of the present invention, the objective lens arranged to face the optical disc is mounted on the lens holder, and the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction.
A fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder and is incident from the movable mirror. A fixed mirror that deflects the light beam in the focus direction and makes it incident on the objective lens is provided, and a movable support member is mounted on the head base so as to be movable in a direction orthogonal to the tracking direction and the focus direction. The moving urging member urges in the moving direction and the moving holding member positions in the opposite direction, and the moving supporting member is formed with a cylindrical concave surface whose axis passes through the center of the reflecting surface of the fixed mirror in the tracking direction. A fixed mirror is attached to a rotation support member that has a cylindrical convex surface that is rotatably supported on the concave surface, The movable mirror is moved integrally with the objective lens by urging the member to the movable support member in the rotation direction by the rotation urging member and positioning in the opposite direction by the rotation holding member, so that tracking of the objective lens is performed. It is possible to prevent the deviation of the optical axis of the light beam due to the movement, and moreover, since the angle and position of the fixed mirror can be adjusted independently, the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens. In addition, it is possible to prevent the optical axis deviation from occurring in the objective lens, and at the same time, it is possible to maintain the optical axis direction of the objective lens in a good condition, and it is possible to obtain an optical head device having good optical characteristics.

In the optical head device of the present invention as defined in claim 7, the objective lens arranged to face the optical disk is mounted on the lens holder, and the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction.
A fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder and is incident from the movable mirror. A fixed mirror that deflects the light beam in the focus direction and makes it incident on the objective lens is provided, and the fixed mirror is attached to a rotation support member having support shafts projecting on both sides that pass through the center of the reflection surface of the fixed mirror in the tracking direction. , A movable support member having a convex portion for rotatably supporting the support shaft of the rotary support member is movably mounted on the head base in a direction orthogonal to the tracking direction and the focus direction, and moved to the head base. A support member fixing means for fixing the support member is provided, and the rotation support member is urged to the movable support member in the rotation direction by the rotation urging member. By having positioned in the opposite direction by rotating the holding member, the movable mirror is moved together with the objective lens, it is possible to prevent the occurrence of optical axis deviation of the light beam by the tracking movement of the objective lens, moreover,
Since the angle and position of the fixed mirror can be adjusted independently, even if the direction of the movable mirror changes due to the adjustment of the optical axis direction of the objective lens, it is possible to prevent the optical axis deviation from occurring in the objective lens, and at the same time, the objective lens The optical axis direction can also be favorably maintained, and an optical head device with good optical characteristics can be obtained.

In the optical head device of the present invention as defined in claim 8, an objective lens arranged to face the optical disc is mounted on a lens holder, and the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction,
A fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder and is incident from the movable mirror. A fixed mirror that deflects the light beam in the focus direction and makes it enter the objective lens is provided, and a pair of fixed mirror support projections that support the fixed mirror so that it can be displaced from both sides in the tracking direction are provided on the head base to support the fixed mirror. Since the fixing member fixing means for fixing the fixed mirror to the convex portion is provided, the movable mirror is moved integrally with the objective lens.
The deviation of the optical axis of the light beam due to the tracking movement of the objective lens can be prevented, and the angle and position of the fixed mirror can be adjusted independently, so that the direction of the movable mirror can be adjusted by adjusting the optical axis direction of the objective lens. Even if it changes, it is possible to prevent the optical axis deviation from occurring in the objective lens, and at the same time, it is possible to maintain the optical axis direction of the objective lens satisfactorily, and it is possible to obtain an optical head device having good optical characteristics.

In the method of assembling and adjusting an optical head device according to a ninth aspect, an objective lens arranged to face an optical disk is mounted on a lens holder, and the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction. Then, a fixed optical system that emits laser light in the tracking direction is provided, and a movable mirror that deflects the light beam incident from this fixed optical system in a direction orthogonal to the focus direction and the tracking direction is provided. A fixed mirror that deflects light in the focus direction to enter the objective lens is mounted on the head base, and a movable mirror is mounted on the lens holder by a movable mirror support mechanism so that the movable mirror can be displaced relative to the head base. Hold the lens holder at an appropriate angle, and in this condition After the adjustment is completed, the movable mirror is fixed to the lens holder after the adjustment is completed, so that even if the direction of the lens holder is changed to adjust the optical axis direction of the objective lens, it can be moved independently. The direction of the mirror can be properly maintained, and an optical head device having good optical characteristics can be obtained.

[Brief description of drawings]

FIG. 1 shows a main part of an optical head device according to a first embodiment of the present invention, in which (a) is a plan view and (b) is a side view.

FIG. 2 is a perspective view showing an optical path of an optical head device.

FIG. 3 is a perspective view showing an entire optical head device.

FIG. 4 is an exploded perspective view showing a movable mirror and a mold member that is a movable mirror support mechanism.

5 is a perspective view showing an optical head device and a mirror adjusting jig 31. FIG.

FIG. 6 is a side view showing an optical head device according to a second embodiment of the present invention.

FIG. 7 is a vertical cross-sectional side view showing a state in which the position of the lens support member is adjusted.

FIG. 8 is a vertical sectional side view showing a modification.

FIG. 9 is a side view showing an optical head device according to a third embodiment of the invention.

FIG. 10 is a perspective view showing a lens holder.

FIG. 11 is a side view showing a state in which the angle of the fixed mirror is adjusted.

FIG. 12 is a side view showing an optical head device according to a third embodiment of the invention.

FIG. 13 is a side view showing an optical head device according to a fourth embodiment of the present invention.

FIG. 14 is an exploded perspective view showing the assembly structure of the optical head device.

FIG. 15 is a perspective view showing an optical head device according to a fifth embodiment of the present invention.

FIG. 16 is an exploded perspective view showing an assembly structure of the optical head device.

FIG. 17 is a perspective view showing an optical head device and a mirror adjusting jig according to a sixth embodiment of the present invention.

FIG. 18 is a perspective view showing a fixed mirror supporting convex portion.

FIG. 19 is a side view showing a state in which the angle of the fixed mirror is adjusted.

FIG. 20 is a side view showing an arrangement of various components of an optical head device of a conventional example.

FIG. 21 is a schematic diagram showing the intensity distribution of a light beam.

FIG. 22 is a perspective view showing the arrangement of various parts of another conventional optical head device.

[Explanation of symbols]

2 optical disk 3 objective lens 4 fixed mirror 5 fixed optical system 12, 41, 81, 101, 111, 121, 141
Optical head device 13 Movable mirrors 14, 42, 82, 102, 112, 122, 142
Head base 19, 44, 71 Lens holder 20 Movable mirror support mechanism 21 Movable mirror fixing means 45 Lens support member 48 Lens fixing means 83 Rotating support member 84 Reflecting surface center 89 Fixed mirror support mechanism 90 Fixed mirror fixing means 103, 114, 123 moving support members 104 and 116 supporting mechanism moving mechanism 105 moving biasing member 106 moving holding member 107 supporting mechanism fixing means 117 supporting mechanism fixing means 124 turning supporting member 125 supporting shaft 128 turning biasing member 129 turning holding member 132 Support member fixing means 143 Fixed mirror support convex portion

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-3-269834 (JP, A) JP-A-6-162520 (JP, A) JP-A-5-135391 (JP, A) JP-A-6- 59172 (JP, A) JP-A-6-349075 (JP, A) JP-A-4-153922 (JP, A) JP-A-3-214435 (JP, A) JP-A-7-14191 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 09-7/10

Claims (9)

(57) [Claims] 1. A fixed optical system which mounts an objective lens arranged to face an optical disc on a lens holder, supports the lens holder on a head base so as to be displaceable in a tracking direction and a focusing direction, and emits a laser beam in the tracking direction. A system is provided, and a movable mirror for deflecting the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is provided, and the light beam incident from the movable mirror is deflected in the focus direction and incident on the objective lens. A movable mirror fixing mechanism that mounts a fixed mirror to the head base, displaceably supports the movable mirror and mounts the movable mirror to the lens holder, and fixes the displaceable movable mirror to the lens holder. An optical head device comprising means. 2. An objective lens, which is arranged so as to face an optical disk, is rotatably mounted on a lens supporting member about a principal point, and an aperture for shaping the outer shape of a light beam is formed on the lens supporting member. The lens holder is mounted movably in the direction orthogonal to the focus direction, the lens holder is supported by the head base so as to be displaceable in the tracking direction and the focus direction, and a fixed optical system for emitting laser light in the tracking direction is provided. A movable mirror that deflects a light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder, and the light beam incident from the movable mirror is deflected in the focus direction to the objective lens. A fixed mirror for incidence is mounted on the head base, and the movable and rotatable objective lens is mounted on the head base. An optical head device comprising a lens fixing means for fixing to a lens holder. 3. An objective lens, which is arranged so as to face an optical disk, is mounted on a lens holder so as to be rotatable about a principal point, and the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focus direction. Is provided in the tracking direction, and a movable mirror that deflects the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is attached to the lens holder and is incident from the movable mirror. A fixed mirror for deflecting a light beam in a focus direction to enter the objective lens is mounted on the head base, and a lens fixing means for fixing the rotatable objective lens to the lens holder is provided. Head device. 4. A fixed optical system which mounts an objective lens arranged to face an optical disk on a lens holder, supports the lens holder on a head base so as to be displaceable in a tracking direction and a focusing direction, and emits a laser beam in the tracking direction. A movable mirror is provided on the lens holder for deflecting the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction, and deflects the light beam incident from the movable mirror in the focus direction. A fixed mirror that makes the objective lens incident is provided, and a fixed mirror support mechanism that rotatably supports the fixed mirror on the head base in a rotation direction in which the axis passes through the center of the reflection surface of the fixed mirror in the tracking direction. Provided with fixed mirror fixing means for fixing the movable fixed mirror to the head base An optical head device characterized by the above. 5. A support mechanism moving mechanism is provided for movably supporting the fixed mirror support mechanism on the head base in a direction orthogonal to the tracking direction and the focus direction, and the movable fixed mirror support mechanism is positionally fixed on the head base. 5. The optical head device according to claim 4, further comprising a supporting mechanism fixing means for performing the above. 6. A fixed optical system in which an objective lens arranged to face an optical disk is mounted on a lens holder, the lens holder is supported by a head base so as to be displaceable in a tracking direction and a focusing direction, and a laser beam is emitted in the tracking direction. A movable mirror is provided on the lens holder for deflecting the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction, and deflects the light beam incident from the movable mirror in the focus direction. A fixed mirror for entering the objective lens is provided, and a movable support member is mounted on the head base so as to be movable in a direction orthogonal to the tracking direction and the focus direction, and the movable support member is moved to the head base by a moving biasing member. Move in the moving direction and position in the opposite direction by the moving holding member A rotating support member having a cylindrical concave surface whose axis passes through the center of the reflecting surface of the fixed mirror in the tracking direction on the support member, and a cylindrical convex surface rotatably supported on the concave surface. An optical head device, wherein the fixed mirror is mounted, and the rotation support member is biased to the movement support member in a rotation direction by a rotation biasing member and is positioned in the opposite direction by a rotation holding member. . 7. A fixed optical system for mounting an objective lens, which is arranged to face an optical disk, on a lens holder, supports the lens holder on a head base so as to be displaceable in a tracking direction and a focusing direction, and emits a laser beam in the tracking direction. A movable mirror is provided on the lens holder for deflecting the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction, and deflects the light beam incident from the movable mirror in the focus direction. A fixed mirror that makes the objective lens incident is provided, and the fixed mirror is mounted on a rotary support member having support shafts projecting on both sides that pass through the center of the reflective surface of the fixed mirror in the tracking direction. A moving support member having a convex portion for rotatably supporting the support shaft of the The head base is provided with a support member fixing means for fixing the moving support member so as to be movable in a direction orthogonal to the focus direction, and the rotary support member is rotated by the rotary biasing member. An optical head device characterized in that it is urged in the moving direction and is positioned in the opposite direction by a rotation holding member. 8. A fixed optical system for mounting an objective lens, which is arranged to face an optical disk, on a lens holder, supports the lens holder on a head base so as to be displaceable in a tracking direction and a focusing direction, and emits a laser beam in the tracking direction. A movable mirror is provided on the lens holder for deflecting the light beam incident from the fixed optical system in the direction orthogonal to the focus direction and the tracking direction, and deflects the light beam incident from the movable mirror in the focus direction. A fixed mirror for entering the objective lens is provided, and a pair of fixed mirror support convex portions for movably supporting the fixed mirror from both sides in the tracking direction are projectingly provided on the head base and fixed to the fixed mirror support convex portion. An optical head device comprising fixed mirror fixing means for fixing a mirror. 9. A fixed optical system for mounting an objective lens, which is arranged to face an optical disk, on a lens holder, supports the lens holder on a head base so as to be displaceable in a tracking direction and a focusing direction, and emits a laser beam in the tracking direction. A system is provided, and a movable mirror for deflecting the light beam incident from the fixed optical system in a direction orthogonal to the focus direction and the tracking direction is provided, and the light beam incident from the movable mirror is deflected in the focus direction and incident on the objective lens. A fixed mirror is mounted on the head base, the movable mirror is mounted on the lens holder by a movable mirror support mechanism so as to be displaceable, and the displaceable movable mirror is held at an appropriate angle with respect to the head base. In this state, adjust the lens holder in the proper direction with respect to the head base, An assembling and adjusting method of an optical head device, characterized in that the movable mirror is fixed to the lens holder after the adjustment is completed.