JPH0817135A - Spindle motor fixing mechanism - Google Patents

Abstract

PURPOSE:To provide a spindle motor fixing mechanism which facilitates the independent adjustment of the correction of the inclination and the operation distance of a spindle motor in an optical disc apparatus with a simple construction. CONSTITUTION:A spacer 7 having a fulcrum part 7a is held between a spindle motor attaching plate 5 and a mechanism chassis 9. It is necessary to turn tightening screws of only two screw parts at which coil springs are held between the plate 5 and the chassis 9 in order to correct the attaching angle of a spindle motor 2. The conventional correction method of the attaching angle and the operation distance wherein the spacer 7 is replaced by a spacer member having a different thickness can be substituted by a method with a simple construction and the correction can be performed independently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor fixing mechanism for rotating an optical disk in order to record or reproduce information on the optical disk.

[0002]

2. Description of the Related Art In recent years, studies for increasing the density of optical disk devices have been actively conducted. In order to achieve this high density, there are methods such as reducing the diameter of the light spot for recording or reproducing information on the optical disc and narrowing the track pitch. For this method, it is indispensable to position the optical axis of the light spot from the objective lens and the incident angle between the recording surface of the optical disc and the distance between the objective lens and the spot incident face of the optical disc with extremely high accuracy. As a means, for example, there is a method of mounting a spindle motor having a configuration disclosed in Japanese Patent Laid-Open No. 61-150162. The configuration will be described below with reference to FIGS. 19, 20, and 21.

FIG. 19 is a perspective view of a conventional optical disk device,
FIG. 20 is a schematic view of a conventional spindle motor fixing mechanism,
FIG. 21 is a configuration diagram of a main part of the conventional spindle motor fixing mechanism in FIG.

In FIG. 19, FIG. 20 and FIG. 21, 101
Is an optical disk, 102 is a spindle motor for rotating the optical disk, 102a is a spindle shaft, 103 is a turntable on which the optical disk 101 is mounted, 104 is an optical pickup equipped with an objective lens 104a, and 105 is a mounting member for holding the spindle motor 102. , 105a
Is a through hole having an opening 105b arranged in the mounting member 105, 106 is a mechanical chassis, 106a is a screw hole provided on the mechanical chassis 106, and 107 is an adjustment groove 107.
a screw shaft having a, 107b is a spherical surface portion, 107c, 10
Reference numeral 7d is a screw portion, 108 is a nut screwed into the screw portion 107c, and 109 is a leaf spring.

The operation will be described below.

Recording and reproduction of information on the optical disc 101,
A spindle motor 102 held by a mounting member 105 and fixed on a mechanical chassis 106 for erasing.
The optical disc 101 is rotationally driven by the optical disc 101, and the optical pickup 104 having the objective lens 104a that forms a minute light spot on the optical disc 101 linearly moves in the radial direction of the optical disc 101. The spindle motor 102 is held by a mounting member 105 and fixed to a mechanical chassis 106 via an adjusting mechanism.

Next, the details of the adjusting mechanism will be described.

The screw portion 107d of the screw shaft 107 is attached to the leaf spring 1.
Screw hole 1 of the mechanical chassis 106 in a state of being inserted into
The screw portion 107d of the screw shaft 107 is screwed into the screw shaft 06a, and the mounting member 105 is positioned so that each screw shaft 107 is inserted into the through hole 105a.
Down in the direction of.

As a result, the spherical portion 107 of the screw shaft 107
The opening 105b of the through hole 105a is engaged with b, and the attachment member 105 is attached to the mechanical chassis 106. Further, when the nut 108 is screwed into the screw portion 107c of the screw shaft 107, the mounting member 105 is fixed to the mechanical chassis 106.

Further, the mounting member 105 and the mechanical chassis 1
The attachment adjustment of 06 can be performed as follows.

First, the nut 108 is loosened, and the adjusting groove 107a of the screw shaft 107 is rotated by a screwdriver or the like to adjust the screwing amount of the screw shaft 107 with the mechanical chassis 106.

If this is done for all adjusting mechanisms,
Spacing between the mounting member 105 and the mechanical chassis 106,
The configuration is such that the inclination direction can be set arbitrarily.

That is, it is possible to adjust the distance between the light beam incident surface of the optical disc 101 and the objective lens 104 and the inclination of the optical axis of the light spot incident from the objective lens 104 on the signal recording surface of the optical disc 101.

[0014]

However, in the above-mentioned configuration, when adjusting the distance between the mechanical chassis 106 and the mounting member 105 and the inclination direction, it is necessary to operate at least three adjusting mechanisms in the same manner. It becomes difficult to separate the adjustment of the interval and the inclination direction. That is, when adjusting the inclination, a problem that the interval also changes occurs, and the adjustment takes time.

The present invention solves the above-mentioned problems and has a simple structure and a distance between a light beam incident surface of an optical disk and an objective lens,
While adjusting the tilt of the optical axis of the light spot from the objective lens that enters the signal recording surface of the optical disc, it is possible to adjust each independently, while achieving simplification and simplification of the adjustment.
It is intended to provide a spindle motor fixing mechanism capable of stabilizing the device and achieving high accuracy.

[0016]

In order to achieve the above object, a spindle motor fixing mechanism of the present invention fixes a spindle motor for rotating an optical disk, a mounting member for holding the spindle motor, and a spindle shaft of the spindle motor. A turntable on which an optical disc can be mounted, an optical pickup that includes an objective lens that forms a minute light spot for recording or reproducing information on the optical disc, and an optical pickup that moves in the radial direction of the optical disc. In an optical disk device including a mechanical chassis on which components are mounted, the mounting member has three through holes for inserting tightening screws for screwing onto the mechanical chassis, and the mechanical chassis has through holes for the mounting member. At the corresponding position, attach the mounting member that holds the spindle motor to the mechanical chassis with the tightening screw. A screw hole is provided as a screwing portion, and one of the screwing portions has a substantially regular distance between the light spot incident surface of the optical disc and the objective lens when the mounting member is screwed to the mechanical chassis. A spacer member having a predetermined thickness is arranged so as to be sandwiched between the mechanical chassis and the mounting member, and a fulcrum portion is formed at the contact portion between the spacer member and the mounting member or the mechanical chassis. The elastic member is sandwiched between the mounting member and the mechanical chassis, and the crevice between the mounting member and the mechanical chassis is rotated by turning the tightening screw of the screw fastening part that clamps the elastic member with the fulcrum as a fulcrum. It is characterized by being variable.

Further, the spacer member may be characterized in that a fulcrum projection serving as a fulcrum is formed.

Further, the mechanical chassis is provided with a fulcrum projection which serves as a fulcrum, and is sandwiched between the fulcrum projection and an attachment member, and is provided with a flat plate spacer member in contact with the fulcrum projection. You can also do it.

Further, a fulcrum projection serving as a fulcrum is formed on the mounting member, and the fulcrum projection is sandwiched between the mechanical chassis and the fulcrum projection.
It may be characterized in that a flat plate spacer member with which the fulcrum portion contacts is provided.

Further, the spacer member is composed of a plurality of kinds of spacer members having the same shape but different thicknesses, and the spacer member can be exchanged to an arbitrary thickness when the mounting member is screwed onto the mechanical chassis. May be

Further, a spindle motor for rotating the optical disc, a mounting member for holding the spindle motor, a turntable fixed to the spindle shaft of the spindle motor and capable of mounting the optical disc, and recording or reproducing information on the optical disc. In order to perform the above, in an optical disc device including an optical pickup that includes an objective lens that forms a minute light spot and moves in the radial direction of the optical disc, and a mechanical chassis that mounts each of the above-mentioned components,
The mounting member has three through holes for inserting tightening screws for screwing the mechanical chassis, and the mechanical chassis has a mounting member for holding the spindle motor at a position corresponding to the through hole of the mounting member. The chassis is equipped with a screw hole that is a screwing part that is screwed with a tightening screw, and one of the screwing parts is sandwiched between the mounting member and the mechanical chassis at the screwing part or the peripheral part of the screwing part. A position correction mechanism is provided, and the position correction mechanism is provided with a position correction member that changes a contact portion with the mechanical chassis or the mounting member by rotating or moving straight to change a gap between the mounting member and the mechanical chassis. The mechanical chassis or the mounting member is provided with a fulcrum portion at the contact portion with the position correcting member, and the other screw fastening portions are sandwiched between the mounting member and the mechanical chassis. An elastic member, and a fulcrum of the fulcrum projections and sandwiching the elastic member, by the rotation of the fastening screw of the screw portion, is characterized in that to allow variable gap between the mounting member and the mechanical chassis.

Further, the position correction member has a rotation center axis substantially parallel to the rotation center axis of the spindle motor, is rotatably supported on the mechanical chassis or the mounting member, and serves as a fulcrum of the position correction member. The contact portion may be formed so as to change its thickness in a direction substantially parallel to the central axis of rotation by the rotation, and the gap between the mechanical chassis and the mounting member may be varied.

Further, the position correction member has a rotation center axis substantially perpendicular to the rotation center axis of the spindle motor, is rotatably supported on the mechanical chassis or the mounting member with a predetermined distance, and is used for position correction. The outer peripheral portion, which is the contact portion with the fulcrum portion of the member, is formed so that the distance between the contact portion and the central axis of rotation is changed by the rotation, so that the gap between the mechanical chassis and the mounting member can be varied. It may be a feature.

Further, the position correcting member is supported on the mechanical chassis or the mounting member so as to be linearly movable in a direction substantially perpendicular to the rotation center axis of the spindle motor, and the contact portion with the fulcrum portion of the position correcting member is moved by the movement. It can also be characterized in that it is formed so as to change the thickness in a direction substantially perpendicular to the moving direction, and that the gap between the mechanical chassis and the mounting member can be varied.

Further, the fulcrum portion has two lines, namely, a first straight line passing through the rotation center of the spindle motor and substantially perpendicular to the moving direction of the optical pickup on a single circle having the same center as the rotation center of the spindle motor. The insertion holes are arranged on either one of the intersections, and the three insertion holes of the mounting member are substantially parallel to the movement direction of the optical pickup and on the intersection where the fulcrum portion is not arranged at the intersection of the circumference and the first straight line. Among the intersections of the second straight line passing through the center of rotation of the spindle motor and the circumference, the first straight line is sandwiched between the intersections on the side opposite to the optical pickup arrangement side, and at the fulcrum or at a predetermined position around the fulcrum. It is characterized by being placed.

In addition, the vibration-damping damper material may be sandwiched between the mounting member and the mechanical chassis and in any gap except the screw fastening portion.

[0027]

With the above-described structure, the present invention independently and reliably corrects the inclination of the optical axis from the objective lens incident on the optical disc and the correction of the distance between the light spot incident surface from the objective lens of the optical disc and the objective lens. It is possible to adjust to.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of an optical disk device having the configuration of the first embodiment of the present invention, and FIG. 2 is an R- line in FIG.
R'cross section, FIG. 3 is a cross section of a main part of TT 'in FIG. 1, FIG. 4 is a top view of an optical disk drive, and FIG. 5 is mounting of a spacer which is a main component in the first embodiment of the present invention. It is a figure which shows the method.

1 to 5, 1 is an optical disk, 2 is
Is a spindle motor 2a for rotating the optical disk 1
Is a spindle shaft, 3 is a turntable on which the optical disc 1 is mounted, 4 is an optical pickup equipped with an objective lens 4a, 5 is a mounting plate for holding a spindle motor, 5a,
Reference numerals 5b and 5c are through holes for screw insertion, 6a, 6b and 6c are tightening screws, 7 is a spacer having a fulcrum spherical surface portion 7a and a mounting groove 7b, 8a and 8b are coil springs which are elastic members, and 9 is a mechanical chassis. , 9a, 9b, 9c are screw holes for attaching the mounting plate.

The spindle motor 2 is held by a mounting plate 5, and is attached to the mechanical chassis 9 via tightening screws 6a, 6b and 6c, a spacer 7 and coil springs 8a and 8b. The optical disk 1 is placed on a turntable 3 fixed to a spindle shaft 2a, and is rotationally driven by a spindle motor 2. An optical pickup 4 having an objective lens 4a that forms a minute light spot on the surface of the optical disc 1 for recording, reproducing, and erasing information on the optical disc 1 has an arrow A at a distance corresponding to a radius of the optical disc 1. Move linearly in the direction. As shown in FIGS. 1 to 5, the three insertion holes 5a, 5b, and 5c are straight lines passing through the center of the optical disk in the moving direction A of the optical pickup 4 on a circle Q concentric with the rotation center of the spindle motor 2. On the circle Q, the insertion hole 5a arranged at the intersection opposite to the arrangement side of the optical pickup on RR 'and the spindle motor 2 on the circle Q are substantially perpendicular to the moving direction of the optical pickup 4.
The insertion holes 5b and 5c are arranged at two intersections with a straight line TT 'passing through the center of the spindle shaft 2a, and the spacer 7 is sandwiched between the insertion holes 5c.

In this embodiment, the objective lens holding member, the objective lens driving section, the optical pickup transfer means, etc. are omitted for the sake of simplicity.

The detailed operation of the first embodiment of the present invention will be described below.

The mounting plate 5 uses the contact point around the fulcrum spherical surface portion 7a of the sandwiched spacer 7 and the insertion hole 5c of the mechanical chassis 9 as a fulcrum to rotate the tightening screws 6a and 6b, whereby the coil spring 8a, 8b is elastically deformed to change the gap with the mechanical chassis 9. That is, it becomes possible to change the mounting angle of the spindle shaft 2a of the spindle motor 2 held by the mounting plate 5, and the objective lens 4 which is incident on the optical disc 1 mounted on the turntable 3 can be changed.
The inclination of incident light from a can be corrected. The tightening screw 6c of the screw fastening portion holding the spacer 7 is tightened when the mounting plate 5 is attached to the mechanical chassis 9,
The tilt correction can be performed by rotating only the tightening screws 6a and 6b, and it is not necessary to rotate the tightening screw 6c, and simplification and simplification of the adjustment can be achieved. If the spacers 7 having the same shape and different thicknesses are prepared in advance, the gap between the mechanical chassis 9 and the mounting plate 5 can be changed by changing the thickness of the spacers 7. hand,
The distance between the light spot incident surface of the optical disc 1 and the objective lens 4a (hereinafter abbreviated as working distance) can also be corrected. For replacement and installation of spacer 7, tighten screw 6
It is not necessary to remove the mounting plate 5 from the mechanical chassis 9 because the spacer 7 can be exchanged using the mounting groove 7b as a guide while the c is slightly loosened.

When the tightening screw 6a inserted into the insertion hole 5a is rotated to correct the tilt angle θ1 of the optical disc 1 in the radial direction, the fulcrum portion and the insertion hole 5b pass T-T 'passing through the rotation center of the spindle motor. Because it is placed on top,
The generation or expansion of the tangential tilt angle θ2 can be suppressed, and the variation in the working distance can be suppressed, so that the adjustment becomes easy.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a cross-sectional view of an essential part of the second embodiment of the present invention and corresponds to FIG. In FIG. 6, 10 is a mechanical chassis in which the fulcrum protrusion 10a is formed, and 11 is a flat plate spacer. Other configurations are shown in FIG.
5 is the same as that of the first embodiment described with reference to FIG.

As shown in FIG. 6, if the spacer 11 is a simple flat plate and the mechanical chassis 10 is provided with the fulcrum projections 10a, the shape of the spacer 11 can be simplified.

Similar results can be obtained with the configuration shown in FIG.

FIG. 7 is a cross-sectional view of essential parts showing another structure of the second embodiment of the present invention.

In FIG. 7, 11 is a flat plate spacer and 12
Is a mounting plate having a fulcrum projection 12a.

In the above-described first and second embodiments, the fulcrum portion for sandwiching the spacer 7 or the spacer 11 is arranged in the insertion hole 5c, but the fulcrum portion has a straight line T-.
The same result is obtained by arranging in the insertion hole 5b portion, which is the intersection of T ′ and the circle Q.

Next, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 8 is a top view of an optical disk drive section according to the third embodiment of the present invention, FIG. 9 is a cross-sectional view of an essential part of the third embodiment of the present invention, and FIG. 10 is the third embodiment of the present invention. FIG. 11 is a schematic view of a correction plate which is a main component in FIG. 11, and FIG. 11 is a configuration diagram of a position correction mechanism in a third embodiment of the present invention.

In FIGS. 8 to 11, 13 is a symbol 13a, 13b, 13c, 13 around the point B at equal intervals.
Reference numeral 14 denotes a correction plate having four protrusions having different heights, 14 is a mechanical chassis having a fulcrum protrusion 14a that comes into contact with the protrusion of the correction plate 13, and 15 is the correction plate 13 at the point B. It is a mounting plate that rotatably supports the center.

The other components are the same as those in the first and second embodiments of the present invention, and the description thereof will be omitted.

Next, the operation of the third embodiment of the present invention will be described.

When correcting the working distance (distance between the light spot incident surface of the optical disk 1 and the objective lens 4a), the correction plate 13 is rotated in the direction of arrow C with the point B as the center of rotation, and the correction plate 1 is rotated.
Any one of the protrusions 3 is brought into contact with the fulcrum protrusion 14a of the mechanical chassis 14 and screwed to the tightening screw 6c.
The correction of the working distance is performed by changing the distance between the mechanical chassis 14 and the mounting plate 15 according to the height difference between the four protrusions. In this embodiment, there are four protrusions having different heights on the correction plate 13. However, the number of protrusions is not particularly limited, and for example, a wedge-shaped rotation that allows continuous dimensional change on the circumference is obtained. If a moving body is used, finer adjustment can be performed. The rotating means of the correction plate 13 is not particularly limited.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 12 is a top view of an optical disk drive section according to the fourth embodiment of the present invention, FIG. 13 is a cross-sectional view of an essential part of the fourth embodiment of the present invention, and FIGS. 14-a and 14-b show the present invention. FIG. 16 is an operation diagram of the position correction mechanism in the fourth example of FIG.

In FIGS. 12 to 14, 16 is supported with a rotation center point E at a distance G from the mounting plate 17,
An eccentric pin having an eccentricity amount d, 16a is an outer peripheral portion of the eccentric pin, and 14 is a mechanical chassis having a fulcrum protrusion 14a that contacts the outer peripheral portion 16a of the eccentric pin at one point. The other components are the same as those of the first to third embodiments of the present invention, and thus the description thereof will be omitted.

Next, the operation of the position correcting mechanism of the fourth embodiment of the present invention will be described with reference to FIGS. 14-a and 14-b.

Since the eccentric pin 16 is fixed to the mounting plate 17 with the center of rotation E at a position of a constant distance G, if the center of rotation E is rotated in the direction of arrow F, the center of rotation E
The distance between the mechanical chassis 14 and the mounting plate 17 is changed by the amount of eccentricity d between the center of the circumference formed by the outer peripheral portion 16a of the eccentric pin 16 and the working distance can be adjusted. The eccentric pin 16 may be rotated by any means. Further, as long as it has a rotation center substantially perpendicular to the spindle axis center and performs position correction, it is not limited to the eccentric pin and may be, for example, a cam-shaped mechanism.

Next, a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 15 is a top view of an optical disk drive section according to the fifth embodiment of the present invention, FIG. 16 is a cross-sectional view of an essential part of the fifth embodiment of the present invention, and FIGS. 17-a and 17-b are FIG.
FIG. 7 is an operation diagram of the position correction mechanism using the GG ′ cross section of FIG.

15 to 17, reference numeral 18 denotes a wedge plate which is slidably supported by the mounting plate 19 in the moving direction H and has an inclined surface 18a. Reference numeral 14 denotes a fulcrum which contacts the inclined surface 18a of the wedge member at one point. It is a mechanical chassis provided with a protrusion 14a.

The other components are the same as those of the first to fourth embodiments of the present invention, and the description thereof will be omitted.

Next, the operation of the fifth embodiment of the present invention will be described with reference to FIG.
-A and FIG. 17-b are demonstrated. When the wedge plate 18 is slid in the direction of the arrow H, the contact point between the fulcrum projection 14a of the mechanical chassis 14 and the slope 18a of the wedge plate 18 moves. In this case, since the slope 14a has an angle in the moving direction, when moving from the point I to the point J, the gap between the mechanical chassis 14 and the mounting plate 19 is changed, and the working distance can be adjusted. The wedge plate 18 may be slid by any means. Further, although the wedge plate 18 has the shape having the inclined surface 18a, the shape is not limited to this shape as long as the distance between the mechanical chassis and the mounting plate is changed by sliding.

In the above-described third, fourth and fifth embodiments of the present invention, the inclination adjustment of the spindle motor 2a is the same as in the first and second embodiments. Since it exists, the description is omitted. In each of the embodiments, the tightening screw on the intersection of the straight line RR ′ and the circle Q is rotated,
When correcting the tilt angle in the radial direction of the optical disk, the fulcrum part and the other insertion hole for sandwiching the coil spring are arranged at the intersection of the straight line TT ′ and the circle Q, so that the tilt angle in the tangential direction is It is possible to suppress the occurrence or enlargement of the movement and further suppress the fluctuation of the working distance, which facilitates the adjustment. In addition, although each position correction mechanism was supported on the mounting plate and the fulcrum protrusions were formed on the mechanical chassis, the position correction mechanism was supported on the mechanical chassis and the fulcrum protrusions were mounted on the mounting plate. It goes without saying that the same result can be obtained even with the formed structure.

Next, a sixth embodiment of the present invention will be described with reference to the drawings.

FIG. 18 is a sectional view of the essential parts in the sixth embodiment of the present invention.

In FIG. 18, reference numeral 20 designates a vibration-proof rubber sandwiched between the mechanical chassis 9 and the mounting plate 5 and in a gap at an arbitrary position where the coil springs 8a, 8b and the spacer 7 are not sandwiched. The other components are the same as those in the first embodiment described with reference to FIGS.

If the anti-vibration rubber 20 is sandwiched, it is possible to prevent unnecessary vibration from the optical disc from being transmitted to the optical pickup when the optical disc is driven to rotate, and to stably record and reproduce information. Further, in the present embodiment, the vibration-damping rubber is used as the vibration-damping damper material, but a metal, resin, or gel-shaped damper material or the like may be used as long as it is a material that suppresses vibrations. In the first to sixth embodiments, the elastic member is a coil spring, but if the member has elasticity, a leaf spring, a rubber material, a commercially available spring washer or the like may be used, and particularly a coil spring. It goes without saying that it is not limited to.

[0064]

According to the present invention, an optical disk, a spindle motor for rotating the optical disk, a mounting member for holding the spindle motor, a turntable fixed to the spindle shaft of the spindle motor and capable of mounting the optical disk, and an optical disk. An optical disc apparatus including an optical pickup that has an objective lens that forms a minute light spot for recording or reproducing information on the optical disc and that moves in the radial direction of the optical disc, and a mechanical chassis that mounts each of the above-described components. In, the mounting member has three through holes for inserting the tightening screws for screwing the mechanical chassis, and the mechanical chassis has a mounting member for holding the spindle motor at a position corresponding to the through hole of the mounting member. The mechanical chassis has a screw hole that is a screwing part that can be screwed with a tightening screw. In one place, when the mounting member is screwed to the mechanical chassis, a spacer member having a predetermined thickness that makes the distance between the light spot incident surface of the optical disc and the objective lens a substantially regular size is attached to the mechanical chassis and the mounting member. They are arranged so as to be sandwiched, a fulcrum portion is formed at the contact portion between the spacer member and the mounting member or the mechanical chassis, and the other screw fastening portions are elastic members sandwiched between the mounting member and the mechanical chassis. With the fulcrum as a fulcrum, the tightening screw of the screw fixing part that clamps the elastic member allows the clearance between the mounting member and the mechanical chassis to be changed, thereby tightening the screw fixing part that clamps the elastic member. By rotating only the screw, the elastic member is elastically deformed, and the angle of the spindle shaft of the spindle motor fixed to the mounting member is adjusted, so the adjustment can be extremely simplified. To become.

Further, the spacer member is provided with a fulcrum projection portion serving as a fulcrum portion, or the mechanical chassis is provided with a fulcrum projection portion serving as a fulcrum portion, and is sandwiched between the fulcrum projection portion and the mounting member. A structure characterized by comprising a flat plate spacer member with which the fulcrum protrusion portion contacts, and the mounting member,
The same effect can be obtained by forming a fulcrum protrusion serving as a fulcrum, sandwiching it between the fulcrum protrusion and the mechanical chassis, and providing a flat spacer member with which the fulcrum contacts.

Further, the spacer member is composed of a plurality of kinds of spacer members having the same shape and different thicknesses, and if the spacer member is configured to be exchangeable to an arbitrary thickness when the mounting member is screwed to the mechanical chassis, the spacer member can be replaced. The angle of the spindle shaft of the spindle motor fixed to the mounting member is changed as described above by rotating the tightening screws of the other two screw fastening portions that do not sandwich the member, and the light spot incident surface of the optical disc is changed. The distance between and the objective lens can also be made variable by changing the thickness of the spacer member to be sandwiched. That is, not only the working distance and the tilt of the optical axis can be adjusted by a simple configuration, but also each can be adjusted independently, so that the adjustment is extremely simplified, and more stable without increasing the accuracy of each part. The detected signal can be achieved in a short time and at low cost.

Further, an optical disc, a spindle motor for rotating the optical disc, a mounting member for holding the spindle motor, a turntable fixed to the spindle shaft of the spindle motor and capable of mounting the optical disc,
An optical disk including an optical pickup that has an objective lens that forms a minute light spot for recording or reproducing information on the optical disk and that moves in the radial direction of the optical disk, and a mechanical chassis that mounts each of the above-described components. In the apparatus, the mounting member has three through holes for inserting tightening screws for screwing on the mechanical chassis, and the mechanical chassis holds the spindle motor at a position corresponding to the through hole of the mounting member. Is equipped with a screw hole that is a screwing part that is screwed to the mechanical chassis with a tightening screw,
One of the screw-fastening parts is equipped with a position-correction mechanism that is sandwiched between the mounting member and the mechanical chassis in the screw-fastening part or the peripheral part of the screw-fastening part, and the position-correcting mechanism must rotate or move straight. The mechanical chassis or the mounting member is provided with a position correction member that changes the contact portion with the mechanical chassis or the mounting member to change the gap between the mounting member and the mechanical chassis. The other screw-fastening portion is provided with an elastic member sandwiched between the mounting member and the mechanical chassis, and the elastic member is sandwiched by using the fulcrum protrusion as a fulcrum. By changing the position of the contact point between the fulcrum protrusion provided on the mechanical chassis or the mounting member and the position correction member due to rotation or rectilinear movement, the mounting member will not move to the mechanical chassis. At the time of mounting, the gap between the mounting member and the mechanical chassis, that is, the distance between the light spot incident surface of the optical disc and the objective lens can be changed, so that the adjustment is further simplified as compared with the configuration using the spacer members having different thicknesses. . The tilt adjustment is the same as the above-described configuration, and the effects are also the same.

The position correction member has a rotation center axis substantially parallel to the rotation center axis of the spindle motor and is rotatably supported on the mechanical chassis or the mounting member.
The contact portion of the position correcting member with the fulcrum portion is formed so as to change its thickness in a direction substantially parallel to the rotation center axis by rotation, or a rotation center axis substantially perpendicular to the rotation center axis of the spindle motor. And rotatably supported on the mechanical chassis or the mounting member with a predetermined distance, and the outer peripheral portion, which is a contact portion with the fulcrum portion of the position correction member, is
A structure that is formed so that the distance between the contact part and the rotation center axis changes, and is supported on the mechanical chassis or mounting member so that it can move straight in a direction substantially perpendicular to the rotation center axis of the spindle motor, and position correction The contact portion of the member with the fulcrum portion may be formed so as to change its thickness in a direction substantially perpendicular to the moving direction by movement, and the same effect can be expected.

Here, the configuration having the rotation axis center substantially parallel to the rotation center axis of the spindle motor enables the device to be particularly thinned.

Further, the structure having the movement direction substantially perpendicular to the rotation center axis of the spindle motor can particularly simplify the processing.

Further, the fulcrum portion has two lines, a first straight line passing through the rotation center of the spindle motor and substantially perpendicular to the moving direction of the optical pickup, on a single circumference having the same center as the rotation center of the spindle motor. The insertion holes are arranged on either one of the intersections, and the three insertion holes of the mounting member are substantially parallel to the movement direction of the optical pickup and on the intersection where the fulcrum portion is not arranged at the intersection of the circumference and the first straight line. Among the intersections of the second straight line passing through the center of rotation of the spindle motor and the circumference, the first straight line is sandwiched between the intersections on the side opposite to the optical pickup arrangement side, and at the fulcrum or at a predetermined position around the fulcrum. According to the arrangement, the tightening screw arranged on the second straight line is rotated, and the inclination in the tangential direction can be almost suppressed when adjusting the inclination in the radial direction of the optical disc. , The fulcrum Because of the first straight line, it made possible hold down the position variation of the disk mounting surface of the turntable.

In addition, if the vibration damping damper material is sandwiched between the mounting member and the mechanical chassis and in any gaps other than the three screw fastening portions, unnecessary vibrations from the optical disc are generated. , Prevent from transmitting to the optical pickup,
It enables stable recording and reproduction of information.

As described above, according to the present invention, the signal recording surface of the optical disk, the correction of the inclination of the optical axis from the objective lens incident on the optical disk, and the optical spot incident surface of the optical disk and the objective lens are configured with a simple structure. It is possible to adjust the distance correction independently, and it is possible to obtain a number of excellent effects such as stabilizing the device and achieving high accuracy while reducing the processing cost and assembly / adjustment cost. The spindle motor fixing mechanism is realized.

[Brief description of drawings]

FIG. 1 is a top view of an optical disc device having a configuration according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line R-R ′ in FIG.

FIG. 3 is a cross-sectional view of a main part of T-T ′ in FIG.

FIG. 4 is a top view of an optical disk drive section.

FIG. 5 is a diagram showing a method of mounting a spacer, which is a main component in the first embodiment.

FIG. 6 is a cross-sectional view of essential parts in a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of main parts showing another configuration of the second embodiment of the present invention.

FIG. 8 is a top view of an optical disk drive unit according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of essential parts in a third embodiment of the present invention.

FIG. 10 is a schematic view of a correction plate which is a main component in the third embodiment of the present invention.

FIG. 11 is a configuration diagram of a position correction mechanism in a third embodiment of the present invention.

FIG. 12 is a top view of an optical disk drive unit according to a fourth embodiment of the present invention.

FIG. 13 is a cross-sectional view of essential parts in a fourth embodiment of the present invention.

FIG. 14-a]

FIG. 14-b is an operation diagram of the position correction mechanism according to the fourth embodiment of the present invention.

FIG. 15 is a top view of an optical disk drive unit according to a fifth embodiment of the present invention.

FIG. 16 is a cross-sectional view of essential parts in a fifth embodiment of the present invention.

17-a],

17-b is an operation diagram of the position correction mechanism using the GG ′ cross section of FIG. 15;

FIG. 18 is a cross-sectional view of essential parts in a sixth embodiment of the present invention.

FIG. 19 is a perspective view of a conventional optical disc device.

FIG. 20 is a schematic view of a conventional spindle motor fixing mechanism.

FIG. 21 is a configuration diagram of main parts of the conventional spindle motor fixing mechanism in FIG. 20.

[Explanation of symbols]

1, 101 Optical disk 2, 102 Spindle motor 2a, 102a Spindle shaft 3, 103 Turntable 4, 104 Optical pickup 4a, 104a Objective lens 5, 12, 15, 17, 19, 105 Mounting plate 5a, 5b, 5c For screw insertion Insertion holes 6a, 6b, 6c Tightening screw 7 Spacer 7a Spherical part for fulcrum 7b Mounting groove 8a, 8b Coil spring 9, 10, 14, 106 Mechanical chassis 9a, 9b, 9c, 106a Screw hole 10a, 12a, 14a Projection for fulcrum 11 Flat Plate Spacer 13 Correction Plates 13a, 13b, 13c, 13d Protrusions with Different Heights 16 Eccentric Pins 16a Outer Part of Eccentric Pins 18 Wedge Plates 18a Slopes of Wedge Plates 105a Through Holes 105b Openings 107 Screw Shaft 107a Adjustment Groove 107b Spherical part 107c, 107d Part 108 nut 109 leaf spring

Claims (11)

[Claims] 1. A spindle motor for rotating an optical disk, a mounting member for holding the spindle motor, a turntable fixed to a spindle shaft of the spindle motor and capable of mounting the optical disk, and information on the optical disk. In an optical disc device including an objective lens that forms a minute light spot for performing recording or reproduction of, an optical pickup that moves in the radial direction of the optical disc, and a mechanical chassis that mounts each of the components, The mounting member includes three insertion holes for tightening screws for screwing the mechanical chassis, and the mechanical chassis is provided at a position corresponding to the insertion hole of the mounting member.
A screw hole, which is a screw fastening portion, for screwing the mounting member to the mechanical chassis with the tightening screw is provided, and one of the screw fastening portions is provided with a screw hole when the mounting member is screwed to the mechanical chassis. A spacer member having a predetermined thickness that makes the distance between the light spot incident surface of the optical disc and the objective lens a substantially regular size is arranged so as to be sandwiched between the mechanical chassis and the mounting member. A fulcrum portion is formed at a contact portion with the attachment member or the mechanical chassis, and the other screw fastening portion includes an elastic member sandwiched between the attachment member and the mechanical chassis, and the fulcrum portion is provided. With the fulcrum as a fulcrum, the gap between the mounting member and the mechanical chassis can be changed by rotating the tightening screw of the screw fastening portion holding the elastic member. Spindle motor fixing mechanism that. 2. The spindle motor fixing mechanism according to claim 1, wherein the spacer member is formed with a fulcrum projection that serves as the fulcrum. 3. The mechanical chassis is provided with a fulcrum projection that serves as the fulcrum, and is sandwiched between the fulcrum projection and the mounting member, and a flat spacer member is in contact with the fulcrum projection. The spindle motor fixing mechanism according to claim 1, wherein: 4. The mounting member is provided with a fulcrum protrusion serving as the fulcrum, and a flat plate spacer member sandwiched between the fulcrum protrusion and the mechanical chassis and in contact with the fulcrum. The spindle motor fixing mechanism according to claim 1, wherein: 5. The spacer member is composed of a plurality of types of spacer members having the same shape and different thicknesses, and the spacer member can be replaced with an arbitrary thickness when the mounting member is screwed into the mechanical chassis. The spindle motor fixing mechanism according to claim 1, wherein: 6. A spindle motor for rotating and driving an optical disk, a mounting member for holding the spindle motor, a turntable fixed to a spindle shaft of the spindle motor and capable of mounting the optical disk, and information on the optical disk. In an optical disc device including an objective lens that forms a minute light spot for performing recording or reproduction of, an optical pickup that moves in the radial direction of the optical disc, and a mechanical chassis that mounts each of the components, The mounting member includes three insertion holes for tightening screws for screwing the mechanical chassis, and the mechanical chassis is provided at a position corresponding to the insertion hole of the mounting member.
The mounting member that holds the spindle motor is provided with a screw hole that is a screw fastening portion that is screwed to the mechanical chassis with the tightening screw, and one of the screw fastening portions is
A position correction mechanism is provided in the screw fastening portion or in the peripheral portion of the screw fastening portion so as to be sandwiched between the mounting member and the mechanical chassis, and the position correction mechanism is rotated or moved straight to move the The mechanical chassis or the mounting member is provided with a position correction member that changes a contact portion with the mounting member to change a gap between the mounting member and the mechanical chassis. The mechanical chassis or the mounting member is in contact with the position correction member. A fulcrum portion, and the other screw fastening portion includes an elastic member sandwiched between the mounting member and the mechanical chassis, and the fulcrum protrusion is used as a fulcrum, and the elastic member is The spindle motor is characterized in that the gap between the mounting member and the mechanical chassis can be varied by rotating the clamped screw of the screwed portion. Fixing mechanism. 7. The position correction member has a rotation center axis that is substantially parallel to a rotation center axis of the spindle motor, and is rotatably supported on the mechanical chassis or the mounting member. The contact portion with the fulcrum portion is formed so that the rotation causes a change in thickness in a direction substantially parallel to the rotation center axis, and a gap between the mechanical chassis and the mounting member can be varied. The spindle motor fixing mechanism according to claim 6, which is characterized in that. 8. The position correcting member has a rotation center axis substantially perpendicular to a rotation center axis of the spindle motor, and is rotatably supported on the mechanical chassis or the mounting member with a predetermined distance. An outer peripheral portion, which is the contact portion with the fulcrum portion of the position correction member, is formed such that the distance between the contact portion and the rotation center axis changes due to the rotation, and the mechanical chassis 7. The spindle motor fixing mechanism according to claim 6, wherein a gap between the mounting member and the mounting member is variable. 9. The position correcting member is supported on the mechanical chassis or the mounting member so as to be linearly movable in a direction substantially perpendicular to the rotation center axis of the spindle motor, and is supported by the fulcrum portion of the position correcting member. The said contact part is formed so that a thickness may be changed to a substantially right-angled direction to the said movement direction by the said movement, and the clearance gap between the said mechanical chassis and the said attachment member is changed. Spindle motor fixing mechanism. 10. The first fulcrum portion passes through a rotation center of the spindle motor, which is substantially perpendicular to a moving direction of the optical pickup, on a single circumference having the same center as the rotation center of the spindle motor. Disposed on either one of the two intersections with a straight line, the three insertion holes of the mounting member, on the intersection where the fulcrum portion is not disposed at the intersection of the circumference and the first straight line, A second passage that passes through the rotation center of the spindle motor and is substantially parallel to the moving direction of the optical pickup;
Among the intersections of the straight line and the circumference of the circle, the first straight line is sandwiched, the intersection is on the opposite side to the optical pickup arrangement side, and the fulcrum portion or the fulcrum portion is arranged at a predetermined position. The spindle motor fixing mechanism according to claim 1 or 6, wherein. 11. Between the mounting member and the mechanical chassis,
7. The spindle motor fixing mechanism according to claim 1 or 6, wherein a vibration damping damper material is sandwiched in an arbitrary gap except for the screw fastening portion.