JP2001344766A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of easily and independently making adjustments in two directions, i.e., the traveling direction of an optical head, and a direction perpendicular to the same, by a small number of part items, regarding the optical axial inclination of the object lens of the optical head with respect to an optical disk. SOLUTION: One end side of each of two traveling shafts 11 and 12, on which an optical head 3 travels, is fixed on a chassis 1, and the other end is inserted into each of first and second insertion slots A and B inclined by angles equal to that of an adjusting block 21, thus providing support. The supporting surface of the first insertion slot A is maintained at a constant height toward the deep side of a hole, and the supporting surface of the second insertion slot B is inclined upwards toward the deep side of a hole. When the adjusting block 21 is moved in a direction perpendicular to the traveling shafts 11 and 12, the heights of the other ends of the traveling shafts 11 and 12 are simultaneously changed. When the adjusting block 21 is rotated around a center point, the height of only the other end of the traveling shaft 12 is changed, and thus the optical axial inclination of the object lens is adjusted in the two directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus provided with an optical head for recording and reproducing information on and from an optical disk. The present invention relates to an optical disk device provided.

[0002]

2. Description of the Related Art A large-capacity optical disk apparatus using a short-wavelength laser or an objective lens having a large numerical aperture for an optical head for recording and reproducing information while traveling in a radial direction of a rotating optical disk has been commercialized. Has become. In such a device, if the optical axis of the objective lens is inclined with respect to the information recording surface of the optical disk, for example, jitter (frequency fluctuation over time) occurs in the reproduced signal, and the expected performance cannot be obtained. And a mechanism for reducing the inclination of the optical axis.

For example, an optical head 10 as shown in FIG.
There are five. As shown in FIG.
02 travels on the traveling shaft 104, and as shown in FIG. 15B, a spherical portion 106 on the bottom surface side of the optical head 105 is supported on a spherical seat 103 provided on the slide base 102 so as to be rotatable. , Objective lens 1 on optical head 105
The optical axis 07 can be adjusted in all directions. Further, as shown in FIG.
1 is provided with a traveling shaft 204 on which an optical head 205 travels, and both sides of the sub-frame 201 are supported by a rotating shaft 208 within the frame of the main frame 200, and the main frame 2
00 and the sub-frame 20 with respect to the main frame 200 by adjusting screws 209 related to the sub-frame 201.
In some cases, the angle can be adjusted. And
The optical head 205 can adjust an inclination angle in a direction perpendicular to the traveling axis 204.

[0004] Further, as shown in FIG.
In addition to one in which the one end of the traveling shaft 05 is fixed to the other end of the traveling shaft 304, the traveling shaft 304 is inclined by tightening a screw 314 from below.
As shown in an exploded perspective view of FIG.
In the publication, an elastic member 416 for urging the traveling shaft 404 for traveling the optical head is integrally formed with the stopper 415, the spring constant of the elastic member 416 is reduced, and the impact resistance and the urging force of the traveling shaft 404 are reduced. There is disclosed a disk device that achieves both stabilization. That is, the traveling shaft 404 is lifted by tightening the elevating member 414, but the elastic member 416 urges the traveling shaft 404 so as not to be separated from the elevating member 414. The stopper 415 has an arch shape surrounding the traveling shaft 404, and the hooks 4 at both lower ends thereof.
15b and 415c, the stopper 409a of the chassis 409 is sandwiched and the traveling shaft 404 is attached to the chassis 409.
However, the stopper 415 has a rotational degree of freedom between the stopper 409a and the stopper receiver 409a, so that even when an impact is applied, the traveling shaft 404 collides with the stopper abutting portion 415a to prevent the traveling shaft 404 from dropping off. The driving shaft 404 can be stably urged even if the urging force is small.

[0005]

The method of adjusting the inclination of the optical head 105 itself shown in FIG. 15 increases the number of components and adjusts the inclination of the optical head 105 itself.
It is difficult to adjust the tilt while observing the jitter of the reproduction signal from the optical disk. Optical head 2 shown in FIG.
The method of adjusting the inclination in the direction perpendicular to the traveling axis 204 by the 05 itself and adjusting the inclination in the direction of the traveling axis 204 in the sub-frame 201 also increases the number of parts and hardly provides mechanical strength such as impact resistance. In addition, since the operation of adjusting the optical head 205 itself is included, it is difficult to adjust the tilt while watching the jitter of the reproduced signal. 17 and FIG.
In the method of adjusting the inclination by using the screw described in (1), since the direction of the traveling axis 304 or the traveling axis 404 and the direction perpendicular thereto are simultaneously moved by one screw, the adjustment of the inclination is not easy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a small number of components required as a mechanism for adjusting the inclination of the optical axis of an objective lens of an optical head with respect to an optical disk. Adjustment in two directions, perpendicular and perpendicular, can be performed separately, and there is no need to adjust the optical head itself, and the tilt of the optical axis can be easily adjusted while observing the jitter of the reproduced signal. It is an object to provide an optical disk device having a mechanism that can be adjusted.

[0007]

Means for Solving the Problems The above-mentioned problem is solved by the structure of claim 1 of the present invention. The means for solving the problem is as follows.

According to a first aspect of the present invention, there is provided an optical disk apparatus having an adjustment mechanism for adjusting the inclination of an optical axis of an objective lens provided on an optical head with respect to the optical disk, wherein the adjustment mechanism has one end near the optical disk as a fulcrum. It is fixed on the chassis so that it can move, and the movement in directions other than up and down is regulated. The whole is urged toward the chassis side, and the two nearly parallel optical heads that run across the optical head And a first insertion slot and a second insertion slot that are drilled at substantially the same height level at the same inclination angle and respectively support the other end sides of the two traveling axes to be inserted. And the first
In the insertion slot, the support surface of the traveling shaft has a constant height from the hole entrance to the hole depth in the depth direction, and the second insertion slot has the support surface of the traveling shaft inclined upward from the hole entrance to the hole depth in the depth direction. And an adjustment block fixed on the chassis so as to be able to move in a direction perpendicular to the traveling axis and to rotate around a center point located substantially in the middle of the two traveling axes. It is.

In such an optical disk device, when the adjustment block is moved on the chassis in a direction perpendicular to the traveling axis,
The other end sides of the two traveling shafts move vertically in the first insertion slot and the second insertion slot, respectively, while simultaneously changing their positions to an obliquely upper position or an obliquely lower position, and move the two traveling shafts. The other end is either higher or lower. That is, the angle formed between the two traveling axes whose one end sides are flexibly fixed and the chassis is increased or decreased, and the optical axis of the objective lens of the optical head on the two traveling axes is an optical disk parallel to the traveling axis. The inclination angle will be changed in the radial direction. When the adjustment block is rotated around the center point on the chassis, the first
Since the height level of the support surface of the insertion slot is constant in the depth direction, the traveling axis whose other end is supported by the first insertion slot keeps the height level constant, but the second insertion length. Since the support surface of the hole is inclined upward in the depth direction, the traveling axis, the other end of which is supported by the second insertion slot, changes its height with rotation, so that the height of the support surface changes. The position is changed upward or downward. That is, while the other end of the traveling shaft supported by the first insertion slot has a constant height, the other end of the traveling shaft supported by the second insertion slot changes its height up and down. Then, the optical axes of the objective lenses of the optical head on the two traveling axes change their inclination angles in the tangential direction of the optical disk perpendicular to the traveling axes. As described above, the inclination of the optical axis of the objective lens of the optical head with respect to the surface of the optical disk is determined by the linear movement and rotation of the adjustment block.
It is possible to adjust in two directions, a direction perpendicular to this.

In the optical disk device according to the second aspect, the eccentric projection on the tip end surface of the shaft of the eccentric driver is located below the first insertion slot on the bottom surface of the adjustment block on the chassis side. A first adjusting slot to be inserted is formed in the direction of the traveling axis, and a second adjusting slot located below the second insertion slot and into which the eccentric projection is also inserted is formed in a direction perpendicular to the traveling axis. , And a screw hole for a screw for fixing the adjustment block is formed at a substantially central point between the two traveling shafts.
In addition, a shaft hole having substantially the same diameter as the shaft of the eccentric driver is formed at a position corresponding to the first adjustment long groove and the second adjustment long groove in the chassis, and further, at a position corresponding to the screw hole, in a direction perpendicular to the traveling axis. In this device, an elongated screw hole is formed, and the adjustment block is fixed to the chassis by a screw that is inserted through the elongated slide hole of the chassis from the rear surface and screwed into the screw hole of the adjustment block.

In such an optical disk device, the shaft of the eccentric driver is inserted into the shaft hole on the first adjustment slot side of the adjustment block from the back side of the chassis, and the eccentric projection is inserted into the first adjustment slot of the adjustment block. By turning left or right,
The adjustment block moves in a direction perpendicular to the traveling axis. Also,
The adjustment block becomes the center point by inserting the shaft of the eccentric driver into the shaft hole on the second adjustment long groove side of the adjustment block, inserting the eccentric projection into the second adjustment long groove of the adjustment block and turning left or right. Rotated around the screw. Then, the inclination of the optical axis of the objective lens of the optical head with respect to the surface of the optical disk is adjusted by the linear movement and rotation of the adjustment block.

According to a third aspect of the present invention, one end of each of the two traveling shafts is inserted into a thin insertion hole formed in a fixing member made of synthetic resin on a chassis. , Which are fixed so as to be able to bend vertically. In such an optical disk device, the thin portion of the insertion hole of the fixed member is elastically deformed, and one end of the traveling shaft can be moved as a fulcrum. An optical disk device according to claim 4 according to claim 1, wherein the two traveling axes are:
This is a device that straddles two traveling shafts and is urged toward the chassis by a leaf spring fixed to the chassis at an intermediate position between the two traveling shafts. Such an optical disc device makes it possible to urge two traveling axes toward the chassis with simple components. The optical disk device according to claim 5 which is dependent on claim 1, wherein each of the two traveling shafts is provided with a guide member having a vertically elongated hole through which a chassis is partially cut and raised and the traveling shaft is inserted. This device is restricted from moving in the direction of. Such an optical disc device makes it possible to restrict the movement of the traveling axis in directions other than up and down with simple components.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the optical disk apparatus of the present invention, as described above, serves as a mechanism for adjusting the inclination of the optical axis of the objective lens of the optical head with respect to the optical disk so that it can move about one end near the optical disk as a fulcrum. The optical head is fixed on the chassis, and movement in directions other than up and down is regulated, and the whole is urged toward the chassis side, and two substantially parallel traveling axes on which the optical head runs across the A first insertion slot and a second insertion slot that are drilled at substantially the same height level at the same inclination angle and respectively support the other end sides of the two traveling shafts to be inserted; In the insertion slot, the support surface of the traveling shaft has a constant height from the hole entrance to the hole depth in the depth direction.
The insertion slot has the support surface of the traveling shaft inclined upward in the depth direction from the hole entrance to the inside of the hole, and is positioned substantially in the middle of the two traveling shafts on the chassis in a direction perpendicular to the traveling shaft. An adjustment block fixed so that rotation around a center point is possible is provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an optical disk drive according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of such an optical disk device, and FIG. 2 is a plan view. That is, the optical disk device 10 includes two traveling axes 11 and 1 on the chassis 1.
2 has one end near the optical disk 4 inserted into the insertion hole of the fixing member 13 made of synthetic resin and is flexibly fixed.
The other end is inserted into and supported by a first insertion slot A and a second insertion slot B formed at the same inclination angle in the adjustment block 21. Then, the optical head 3 including the objective lens 2 straddles the traveling axes 11 and 12, and is driven by the driving unit 9 to travel. The running shafts 11 and 12 are restricted from moving in directions other than up and down by a guide member 14 having a vertically long hole 14h into which the running shafts 11 and 12 are inserted. , 12 are urged toward the chassis 1 by a leaf spring 15 fixed to the chassis 1. The optical disk 4 is set and rotated on the turntable 5 at one end of the traveling shafts 11 and 12, and the optical head 3 travels in the radial direction below the optical disk 4 and has an optical axis perpendicular to the optical disk 4. Recording and reproduction of information are performed by light passing through the objective lens 2.

The two substantially parallel traveling shafts 11 and 12 on which the optical head 3 travels have one end fixed on the chassis 1 and the height position of the other end changed, so that the light travels on the surface of the optical disc 4. Since the inclination of the optical axis of the objective lens 2 of the head 3 is adjusted, it is necessary that one end of each of the two traveling axes 11 and 12 can move as a fulcrum, but such movement is possible. As long as it is fixed, it may be fixed in any way, for example, it may be fixed like a ball joint. In order to easily perform such fixing, FIG.
As shown in the enlarged view of the perspective view of FIG. 1, the fixing member 13 made of synthetic resin can be fixed by inserting one end side of the traveling shafts 11 and 12 into an insertion hole 13h whose upper and lower portions are formed thin. The upper and lower thin portions of the insertion hole 13h bend according to the vertical movement of the other ends of the traveling shafts 11 and 12, so that one end of the traveling shafts 11 and 12 functions as a fulcrum.

Also, two traveling shafts 1 having one end fixed.
1 and 12 must be restricted from moving in other ways than up and down. That is, the guide member 1 provided with the long hole 14h in the vertical direction into which the two traveling shafts 11 and 12 are inserted, respectively.
4 can be attached to the chassis 1. Furthermore, two traveling shafts 11, 12 having one end fixed thereto.
Must be urged toward the chassis 1 as a whole. For this purpose, the running shafts 11 and 12 may be pressed toward the chassis 1 by any method using a spring having any shape, but a leaf spring 15 straddling the two running shafts 11 and 12 may be used. By fixing to the chassis 1 at an intermediate position between the two traveling shafts 11 and 12, the two traveling shafts 11 and 12 can be urged toward the chassis 1 with a small number of parts.

FIG. 3 is a side view showing the surface of the adjustment block 21 on the first insertion slot A and the second insertion slot B side, and FIG. 4 is a cross section taken along the line [4]-[4] in FIG. FIG. 5 is a sectional view taken along the line [5]-[5] in FIG. FIG.
As shown in the figure, the adjustment block 21 is configured such that the first insertion slot A and the second insertion slot B supporting the other end sides of the two traveling shafts are inclined at the same angle and have substantially the same height level. Must be drilled in Although their inclination angles are not particularly limited, as described later, the adjustment of the inclination of the optical axis of the objective lens 2 is performed by moving a large stroke of the adjustment block 21 in a direction perpendicular to the traveling axes 11 and 12.
In order to perform the rotation by a large angle rotation about the center point of the adjustment block 21, the first insertion slot A and the second insertion slot B
Is preferably small.

Further, as shown in FIG. 4, the first insertion slot A has a support surface 11s of the traveling shaft 11 at a constant height from the hole entrance to the hole depth in the depth direction, and the second insertion slot B has , FIG.
As shown in (2), the support surface 12s of the traveling shaft 12 is inclined upward from the hole entrance to the hole depth in the depth direction. The angle of the upward inclination of the support surface 12s of the traveling shaft 12 of the second insertion slot B is not particularly limited.
In order to adjust the inclination of the optical axis by turning the adjustment block 21 at a large angle around the center point, it is preferable that the angle of the upward inclination of the support surface 12s is small. FIG. 3 shows a fixing screw 1 for fixing the adjustment block 21 to the chassis 1.
Eight screw holes 18h are formed.

The above-described adjustment block 21 includes a linear movement in a direction perpendicular to the traveling axes 11 and 12 as indicated by an arrow x in FIG. 2 and a traveling axis 11 and a traveling axis 12 as indicated by an arrow r. Screw 18 on the bottom side corresponding to the middle position between
And rotation about the center. That is, as for the linear movement, as shown in FIG. 6 which is a partial cross-sectional view of the adjustment block 21 and the chassis 1, on the chassis 1, the fastening screw 18 is slightly loosened, and the adjustment block 21 is indicated by an arrow x. It is to be moved in the direction shown. In FIG. 6, the other end of the traveling shaft 11 is inserted and supported in the adjustment block 21 shown by a solid line at the center of the first insertion slot A, and the traveling shaft 12 is also connected to the second insertion slot B.
When the adjustment block 21 is moved from the position indicated by the solid line to the position indicated by the alternate long and short dash line, the movement in directions other than up and down is restricted by the guide member 14. Running shaft 11 is the first insertion slot A
At the same time, the traveling shaft 12 also changes its position to the obliquely upper position along the inclination of the second insertion slot B having the same inclination angle, and the height position is raised.

That is, the traveling shafts 11, 12 having one end fixed on the chassis 1 are simultaneously moved upward by the same height on the other end, so that the traveling shafts 11, 12 run across the traveling shafts 11, 12. The inclination of the optical axis of the objective lens 2 of the optical head 3 is adjusted by falling toward the optical disk 4 in a radial direction parallel to the traveling axes 11 and 12 of the optical disk 4. Conversely, when the adjustment block 21 is moved from the position indicated by the dashed line to the position indicated by the solid line, the optical axis of the objective lens 2 is set opposite to the above case.
And the inclination of the optical axis is adjusted.

On the other hand, with respect to the rotation of the adjustment block 21, if the adjustment block 21 shown by a solid line in FIG. 6 is rotated around the center screw 18 in a clockwise direction, for example, see also FIG. The first insertion slot A of the adjustment block 21 moves from the position indicated by the solid line to the position indicated by the dashed line as shown in FIG. 7 which is a cross-sectional view taken along the line [7]-[7] in FIG. Although it goes away from the traveling shaft 11, the first insertion slot A
Is formed at a constant height, so that the other end side of the traveling shaft 11 is kept at a constant height position. On the other hand, the second insertion slot B of the adjustment block 21 is indicated by a dashed line from the position indicated by the solid line as shown in FIG. 8, which is a cross-sectional view taken along the line [8]-[8] in FIG. To the traveling axis 12. However, since the support surface 12s of the second insertion slot B is inclined upward toward the inside of the hole, the other end of the traveling shaft 12 is indicated by a dashed line from the position indicated by the solid line during this rotation. The height is raised to the position.

That is, the adjusting block 21 is used for the fastening screw 1.
8, the other end side of the traveling shaft 11 does not change its height position, but the other end side of the traveling shaft 12 is raised. , Traveling axis 1
The optical axis of the objective lens 2 of the optical head 3 traveling across the traveling axis 1 and the traveling axis 12 is tilted toward the traveling axis 11 in a tangential direction perpendicular to the traveling axes 11 and 12 of the optical disc 4 to adjust the inclination. Is done. Conversely, the adjustment block 21 is rotated counterclockwise, and the first insertion slot A and the second insertion slot B of the adjustment block 21 are moved from the position indicated by the dashed line to the position indicated by the solid line. Then, the other end of the traveling shaft 11 is
The height position of the other end of the traveling shaft 12 is lowered from the position indicated by the dashed line to the position indicated by the solid line in FIG. 8, so that the optical axis of the objective lens 2 is 4 in the tangential direction perpendicular to the traveling shafts 11 and 12, the inclination is adjusted by leaning toward the traveling shaft 12.

As described above, the tilt of the optical axis of the objective lens 2 is changed in two directions by moving the adjustment block 21 in the direction indicated by the arrow x and turning it in the direction indicated by the arrow r in FIG. The adjustment is performed, but the method of fixing the adjustment block 21 on the chassis 1 at that time, the movement of the adjustment block 21 in the direction indicated by the arrow x, and the rotation in the direction indicated by the arrow r are performed by any method. Well, those methods are not limited. However, the linear movement and rotation of the adjustment block 21 can be simply performed as follows. FIG. 9 is a side view of the adjustment block 21 showing the first insertion slot A and the second insertion slot B similar to FIG. 3, and FIG.
FIG. 2 is a plan view showing a bottom surface which is a contact surface with the chassis 1. That is, as shown in FIG.
The traveling shaft 1 is positioned below the first insertion slot A on the bottom surface of the traveling shaft 1.
A first adjusting slot a in the same direction as the first and second slots 12 is formed, and the traveling shafts 11 and 12 are located below the second insertion slot B.
Is formed in the second adjustment long groove b in a direction perpendicular to the direction. The first adjustment long groove a and the second adjustment long groove b are long grooves into which small columnar eccentric projections 32 on the distal end surface of the shaft 31 of the eccentric driver shown in FIG. As described above, the screw hole 18h of the retaining screw 18 for fixing the adjustment block 21 to the chassis 1 is provided at a center point between the center of the first adjustment long groove a and the center of the second adjustment long groove b. I have.

FIG. 11 is a cutaway perspective view of the rear surface side of a portion where the adjustment block 21 is fixed to the chassis 1, and is a diagram for explaining a method of moving or rotating the adjustment block 21 by an eccentric driver. That is, the shaft holes 6 and 7 having the same diameter as the shaft portion 31 of the eccentric driver are provided on the rear surface side of the chassis 1 at positions corresponding to the center portions of the first adjustment long groove a and the second adjustment long groove b of the adjustment block 21. Are formed respectively. In addition, the traveling axes 11, 1
An elongated slide hole 8 is formed in which the retaining screw 18 slides in a direction perpendicular to 2. Then, the shaft portion 31 of the eccentric driver is inserted into the shaft hole 6, for example, from the rear side of the chassis 1, and the eccentric protrusion 32 is inserted into the first adjustment slot a on the bottom surface of the adjustment block 21. 12A and 12B are a plan view and a cross-sectional view showing the state. FIG. 12A is a partially broken plan view from the back side of the chassis 1, and FIG. 12B is a line [B]-[B] in FIG. FIG. When the shaft 31 of the eccentric driver is turned counterclockwise in this state, FIG.
2A, the eccentric protrusion 32 of the eccentric driver
Is moved along the circumference of the shaft hole 6 from the position indicated by the solid line to the position indicated by the dashed line, and accordingly, the first adjustment slot a, that is, the adjustment block 21 causes the set screw 18 to slide the slide slot 8.
Is moved in the direction indicated by the arrow x by sliding along
As shown in FIG. 12B, the traveling shafts 11 and 12 raise their height at the same time.

FIG. 13 shows the shaft 3 of the eccentric driver.
FIG. 2 is a plan view and a cross-sectional view showing a state in which a shaft 1 is inserted into the shaft hole 7 from the rear surface side of the chassis 1 and an eccentric projection 32 is inserted into a second adjustment slot b on the bottom surface of the adjustment block 21. 13A is a partially broken plan view from the back side of the chassis 1, and FIG. 13B is [B] − in FIG.
It is a longitudinal cross-sectional view in the [B] line. When the shaft 31 of the eccentric driver is turned clockwise in this state, the eccentric protrusion 32 of the eccentric driver is turned into the shaft hole 7 in FIG.
Is moved along the circumference, and the second adjusting long groove b is turned around the set screw 18 in the counterclockwise direction indicated by the arrow r.
The adjusting block 21 in which the second adjusting slot b is formed is also simultaneously rotated counterclockwise around the set screw 18, as shown in FIG.
As shown in 3B, the traveling axis 11 does not change its height position, but the traveling axis 12 raises its height position.

As described above, the shaft 31 of the eccentric driver is inserted into the shaft hole 6 on the rear surface side of the chassis 1 so that the eccentric protrusion 32
Can be moved in the direction of the arrow x by turning the shaft 31 of the eccentric driver to the left and right, and the shaft 31 of the eccentric driver can be inserted into the shaft hole 7. By inserting the eccentric projection 32 into the second adjustment slot b and turning the shaft 31 of the eccentric driver to the left and right, the adjustment block 21 can be rotated in the direction of the arrow r, so that the objective lens 2 of the optical head 3 can be rotated. The tilt of the optical axis can be adjusted in two directions. After the adjustment,
The work is completed by tightening the retaining screw 18 tightly.

Although the optical disk device of the present invention has been described with reference to the embodiment, it is needless to say that the present invention is not limited to this, and various modifications can be made based on the technical concept of the present invention.

For example, in this embodiment, as shown in FIG. 3, the first insertion slot A and the second insertion slot B are inclined rightward and downward. It may be an inclined hole. In FIG. 3, the positions of the first insertion slot A and the second insertion slot B may be exchanged. In that case, the positions of the first adjustment slot a and the second adjustment slot b are simultaneously set. It needs to be replaced. Also, in FIG.
Although the first insertion slot A and the second insertion slot B are rectangular slots, both ends may be formed in a semicircular shape. 4 and 5, the first insertion slot A and the second insertion slot A
Although the insertion slot B is a bottomed blind hole, it may be a through hole as a matter of course.

In the present embodiment, as shown in FIG. 1, the chassis 1 is partially cut and bent into a screen shape as a member for restricting the movement of the traveling shafts 11 and 12 in directions other than up and down. Running shaft 11 in the rising part obtained by
Alternatively, a guide member 14 having a vertically long hole 14h through which the traveling shaft 12 is inserted is employed. It is obvious that the movement in the direction of can be regulated. In the present embodiment, the adjustment block 21 and the chassis 1 are fixed in contact with each other, but the adjustment block may be fixed with a spacer that does not hinder the linear movement of the adjustment block from rotating.

[0031]

The disk drive according to the present invention is implemented in the form described above, and has the following effects.

According to the optical disk apparatus of the first aspect, one end near the optical disk is fixed to the chassis, and the first end supports the other ends of the two traveling shafts on which the optical head travels.
The operation of moving the adjustment block having the insertion slot and the second insertion slot in the direction perpendicular to the two traveling axes on the chassis and the operation of rotating the adjustment block around the center point are performed by the light. With a small number of parts, the inclination of the optical axis of the objective lens of the head can be adjusted in two directions, the direction of the traveling axis and the direction perpendicular to the traveling axis, independently and in a short time with simple operations. Further, the adjustment is performed at a position opposite to the optical disk, and the adjustment can be performed while observing the jitter of the reproduced signal.

According to the optical disk device of the second aspect, the adjustment block is moved in a direction perpendicular to the traveling axis by inserting and turning the projection of the eccentric driver from the shaft hole of the chassis into the first adjustment slot of the adjustment block. The adjustment block can be rotated about the center point by inserting and turning the projection of the eccentric driver from the adjustment round hole of the chassis into the second adjustment slot of the adjustment block, and thereby turning the light of the objective lens. The inclination of the shaft can be adjusted independently in two directions by a very simple operation. According to the optical disk device of the third aspect, the two traveling shafts are fixed so that one end of each traveling shaft can be moved as a fulcrum by being inserted into a fixing member made of synthetic resin on the chassis. The tilt of the optical axis of the objective lens can be adjusted very easily and at low cost by moving the other end of the objective lens simultaneously or moving one of the other end in the vertical direction.

According to the optical disk device of the fourth aspect, the bias of the two traveling shafts toward the chassis straddles the two traveling shafts and is fixed to the chassis at an intermediate position between the two traveling shafts. Therefore, the two traveling shafts can be biased toward the chassis very easily and at low cost. According to the optical disk device of the fifth aspect, the movement of the two traveling shafts in the directions other than up and down is partially cut and bent in the chassis to provide a vertically long hole through which the traveling shaft is inserted. Since the movement is performed by the guide member, the movement of the two traveling axes in directions other than up and down can be regulated very easily at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical disk device according to an embodiment.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view showing a surface on which a first insertion slot A and a second insertion slot B of an adjustment block are formed.

FIG. 4 is a sectional view taken along the line [4]-[4] in FIG.

FIG. 5 is a sectional view taken along line [5]-[5] in FIG. 3;

FIG. 6 is a partial cross-sectional view of an adjustment block and a chassis.

FIG. 7 is a sectional view taken along the line [7]-[7] in FIG.

8 is a sectional view taken along the line [8]-[8] in FIG.

FIG. 9 is a side view of the adjustment block similar to FIG. 3;

FIG. 10 is a plan view showing a bottom surface of the adjustment block.

FIG. 11 is a perspective view showing a method of moving or rotating an adjustment block by an eccentric driver.

12A and 12B are diagrams showing linear movement of an adjustment block by an eccentric driver, wherein A is a partially broken plan view from the chassis side, and B is a longitudinal sectional view taken along the line [B]-[B] in A.

FIG. 13 is a view showing rotation of an adjustment block by an eccentric driver, where A is a partially broken plan view from the chassis side;
B is a longitudinal sectional view taken along the line [B]-[B] in A.

FIG. 14 is an enlarged perspective view showing a fixing member on one end side of a traveling shaft.

FIGS. 15A and 15B are diagrams showing a first conventional example relating to optical axis adjustment of an objective lens, wherein A is a perspective view, and B is a cross-sectional view perpendicular to a traveling axis.

FIG. 16 is a perspective view showing the second conventional example.

FIG. 17 is a perspective view showing the third conventional example.

FIG. 18 is a perspective view showing a fourth conventional example.

[Explanation of symbols]

1 ... chassis, 2 ... objective lens, 3 ... optical head,
4 ... optical disk, 6 ... shaft hole, 7 ... shaft hole, 8 ... slide hole, 10 ... optical disk device, 11 ... travel shaft, 12 ... travel shaft, 13 ... fixing member, 14 ... … Guide member, 15… Leaf spring, 18… Set screw, 21…
Adjustment block, 31 ... Eccentric screwdriver shaft, 32 ...
The same eccentric protrusion, A ... first insertion long hole, B ... second insertion long hole, a ... first adjustment long groove, b ... second adjustment long groove.

Claims (5)

[Claims] 1. An optical disk device comprising an adjustment mechanism for adjusting the inclination of an optical axis of an objective lens provided on an optical head with respect to an optical disk, wherein the adjustment mechanism is capable of moving about one end near the optical disk as a fulcrum. The optical head is fixed to the chassis, and movement in directions other than up and down is regulated, and the whole is urged toward the chassis, and the two substantially parallel traveling axes on which the optical head runs across And a first insertion slot and a second insertion slot that are drilled at substantially the same height level at the same inclination angle and respectively support the other end sides of the two traveling shafts to be inserted. The first insertion slot has a support surface of the traveling shaft having a constant height from the hole entrance to the hole depth in the depth direction, and the second insertion slot has a support surface of the traveling shaft extending from the hole entrance in the depth direction. It is inclined upward to the inside of the hole and An adjustment block fixed on the chassis so as to be able to move in a direction perpendicular to the traveling axis and to rotate around a center point located substantially in the middle of the two traveling axes. An optical disc device characterized by the above-mentioned. 2. A first adjustment long groove, which is located below the first insertion long hole and into which an eccentric protrusion on a tip surface of a shaft of an eccentric driver is inserted, is provided on a bottom surface of the adjustment block on the chassis side. The second eccentric projection is formed in the direction of the traveling axis, and is located below the second insertion slot and in which the eccentric projection is also inserted.
An adjusting slot is formed in a direction perpendicular to the traveling shaft, and a screw hole for a screw for fixing the adjusting block is formed at the center point substantially intermediate between the two traveling shafts, and the chassis has A shaft hole having substantially the same diameter as the shaft of the eccentric driver is formed at a position corresponding to the first adjustment long groove and the second adjustment long groove, and a direction perpendicular to the running shaft is formed at a position corresponding to the screw hole. The slide block is formed on the chassis, and the adjustment block is fixed to the chassis by the screw which is inserted into the slide slot of the chassis from the back side and screwed into the screw hole of the adjustment block. 2. The method according to claim 1, wherein
An optical disk device according to claim 1. 3. One end of each of the two traveling shafts is inserted into a thin insertion hole formed in a fixing member made of synthetic resin on the chassis, and is fixed so as to be able to bend vertically. 2. The optical disk device according to claim 1, wherein: 4. The two running shafts straddle the two running shafts and are urged toward the chassis by a leaf spring fixed to the chassis at an intermediate position between the two running shafts. 2. The optical disk device according to claim 1, wherein: 5. Each of the two traveling shafts partially cuts and raises the chassis and is provided with a vertically long slot through which the traveling shaft is inserted. 2. The optical disk device according to claim 1, wherein the optical disk device is regulated.