JP3797846B2 - Adjusting device for optical pickup transfer mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer mechanism of an optical pickup in a disk apparatus for recording and reproducing information on a disk such as a DVD or a CD, and more particularly to a guide shaft that supports a carriage on which an optical pickup is mounted and moves in a thrust direction. The present invention relates to an adjusting device for adjusting the mounting height of a shaft member such as a screw shaft.
[0002]
[Prior art]
An optical pickup as shown in FIG. 4 is used for a disk device that records and reproduces information on a disk such as a DVD or a CD using an optical pickup, in order to transport the optical pickup along the radial direction of the disk. A transfer mechanism is provided.
[0003]
In the figure, reference numeral 1 denotes a carriage on which an optical pickup 2 is mounted. The carriage 1 is disposed between a guide shaft 3 and a screw shaft 4. The guide shaft 3 and the screw shaft 4 are arranged to face each other in parallel on one side of a mechanism chassis (not shown), and the screw shaft 4 is rotationally driven in both forward and reverse directions using a thread motor (not shown) as a drive source. It is like that. Receiving portions 1 a and 1 b are projected from both side surfaces of the carriage 1, one receiving portion 1 a abuts on the peripheral surface of the guide shaft 3, and the other receiving portion 1 b is loosely inserted into the screw shaft 4. . A leaf spring 5 is screwed to the carriage 1 in a cantilever shape, and a female screw member 6 called a half nut is fixed to the free end side of the leaf spring 5. Then, the tooth portion engraved on the female screw member 6 over about a half circumference receives the elastic force from the leaf spring 5 and meshes with the screw portion 4 a of the screw shaft 4.
[0004]
The optical pickup transfer mechanism schematically configured as described above is such that when the screw shaft 4 rotates in either the forward or reverse direction, the rotational force is converted into a linear motion by the female screw member 6 and transmitted to the carriage 1. 1 moves along the thrust direction (arrow direction in FIG. 4) of the guide shaft 3 and the screw shaft 4. As a result, the optical pickup 2 mounted on the carriage 1 is transported in the radial direction of the disc (not shown), and information recording and reproducing operations can be performed on the disc.
[0005]
By the way, in a disc apparatus equipped with an optical pickup, if the optical axis of the objective lens of the optical pickup is not kept perpendicular to the recording surface of the disc, the detection accuracy is caused by distortion in the laser beam spot. It is easy to invite a decline. Therefore, in the optical pickup transfer mechanism described above, the optical axis of the objective lens of the optical pickup 2 is made to be the recording surface of the disc by maintaining the parallelism of the guide shaft 3 and the screw shaft 4 that support the carriage 1 and move in the thrust direction. To keep it vertical. However, when information is recorded or reproduced by an optical pickup on a disk having a very high recording density such as a DVD, the perpendicularity between the recording surface of the disk and the optical axis of the objective lens of the optical pickup is slightly impaired. Since the detection accuracy is greatly reduced only by this, it is necessary to correct a slight inclination of the optical axis caused by accumulation of dimensional tolerances of each component.
[0006]
Therefore, conventionally, as disclosed in JP-A-10-125016, by holding the end of a shaft member such as a guide shaft so as to be movable up and down, the mounting height of the shaft member can be adjusted after assembly. An adjusting device has been proposed. In such a conventional adjustment device, a holding member that supports one end portion of the shaft member is attached to a support stand that is erected on the mechanism chassis, and the holding member is urged by an elastic member from the mechanism chassis side. The holding member is pressed from the non-mechanism chassis side by an adjusting screw screwed to the support base. Therefore, if the adjustment screw is screwed against the urging force of the elastic member, one end of the shaft member can be pushed down integrally with the holding member, and conversely, if the adjustment screw is screwed back, the elastic member is attached. Since the holding member is raised by the force, one end portion of the shaft member can be pushed up. In other words, since the mounting height of the shaft member such as the guide shaft can be adjusted by appropriately raising and lowering the holding member after assembly, the slight inclination of the optical axis of the objective lens of the optical pickup can also be adjusted.
[0007]
[Problems to be solved by the invention]
In the prior art described in Japanese Patent Laid-Open No. 10-1225016 described above, a support base standing on the chassis and an elastic member such as a leaf spring are provided between the holding member that supports one end of the shaft member and the mechanism chassis. There is a problem that it is difficult to suppress the overall height of the adjusting device because the adjusting screw is attached from the side opposite the chassis of the holding member. That is, in such a prior art, since the members constituting the adjusting device must be assembled on one side of the mechanism chassis in a stacked manner, the overall height dimension is inevitably increased. It was easy to become an obstacle to thinning.
[0008]
The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide an optical pickup that can easily adjust the mounting height of a shaft member such as a guide shaft or a screw shaft without hindering the reduction in thickness. An object of the present invention is to provide an adjustment device for a transfer mechanism.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention supports a carriage on which an optical pickup is mounted with a pair of shaft members arranged opposite to each other in parallel on the mechanism chassis side, and the carriage along the thrust direction of these shaft members. In the adjusting device for the optical pickup transfer mechanism, the shaft end support part for supporting one end part of the shaft member and the swing center can be adjusted. An adjustment bracket provided in parallel to the shaft member, locking means for locking the fulcrum portion of the adjustment bracket to the mechanism chassis, and slidingly contacting the adjustment bracket and regulating means for defining a swinging direction, interposed between said adjusting bracket the mechanism chassis, away said adjustment bracket from the mechanism chassis Comprising a spring member for urging in a direction in which, and an adjusting screw allowed to couple the adjustment bracket is screwed to the threaded portion provided on the mechanism chassis to the threaded portion of the mechanism chassis via the spring member The spring member and the adjustment screw are disposed between the shaft end support portion and the fulcrum portion of the adjustment bracket, and the adjustment bracket is moved into and out of the threaded portion by the adjustment bracket. The shaft end support portion of the adjustment bracket moves up and down with respect to the mechanism chassis by swinging about the shaft, and the shaft supported by the shaft end support portion as the shaft end support portion moves up and down. characterized in that the one end of the member is in so that the elevator relative to the mechanism chassis.
[0010]
The adjusting device of the optical pickup transfer mechanism configured as described above is arranged in parallel with the shaft member without being stacked with the shaft member such as the guide shaft and the screw shaft, and the adjusting screw is attached to the mechanism chassis. comprises an adjustment bracket linked via, or install a lateral adjustment screw in the adjustment bracket at an appropriate point of the shaft end supporting portion may be or is engaged the mechanism chassis at its fulcrum, the shaft member in a height direction In addition, the height of the shaft member can be adjusted with a configuration in which the members such as the adjustment bracket are not stacked, and there is no fear of obstructing the thinning of the disk device.
Further, if the spring member and the adjustment screw are disposed between the shaft end support portion and the fulcrum portion of the adjustment bracket, it is not necessary to enlarge the adjustment bracket, which is preferable in terms of improving the space factor.
[0011]
Further, in such an adjustment device, if the distance from the fulcrum portion to the adjustment screw is set shorter than the distance from the fulcrum portion of the adjustment bracket to the shaft end support portion, the adjustment amount of the mounting height of the shaft member can be reduced. A large adjustment screw can be used with a short adjustment screw, which is preferable in reducing the overall height.
[0012]
Further, in this adjusting device, a cut-and-raised portion having a wide tip portion is erected on the mechanism chassis as the locking means, and a wide hole through which the wide tip portion of the cut-and-raised portion can be inserted is communicated with the wide hole. When the adjustment bracket is provided with a locking hole having a narrow hole through which the wide tip portion cannot be inserted, and the cut and raised portion is fitted into the narrow hole via the wide hole, the wide tip portion engages the adjustment bracket. If it is made to stop, when attaching an adjustment bracket, the cut-and-raised part by the side of a mechanism chassis can be easily latched to the fulcrum part. In addition, if the cut-and-raised part is locked to the fulcrum part of the adjustment bracket in this way, it is preferable to improve the assemblability because the adjustment screw and the like can be easily attached.
[0013]
In the adjusting device, a guide pin is erected on the mechanism chassis as the restricting means, and a long hole extending in the thrust direction of the shaft member and slidably inserted through the guide pin is provided in the adjustment bracket. In this case, the inner wall of the elongated hole is restricted by the guide pin when the adjustment bracket swings, so that the swing direction of the adjustment bracket can be accurately defined with a simple configuration.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an adjusting device for an optical pickup transfer mechanism according to an embodiment of the present invention, and FIG. 2 is a sectional view of the adjusting device. 3 is a plan view of the adjusting device.
[0016]
The adjusting device shown in these figures is incorporated in an optical pickup transport mechanism of a disk device that records and reproduces information on a disk such as a DVD, and is a screw that supports a carriage (not shown) and moves in a thrust direction. This is for adjusting the mounting height of one end of the shaft. In addition, as described above, the carriage on which the optical pickup (not shown) is mounted is supported by a pair of shaft members arranged opposite to each other in parallel on one side of the mechanism chassis. The screw shaft and a guide shaft (not shown) support the carriage.
[0017]
First, the configuration of the adjusting device will be described. Reference numeral 10 denotes a screw shaft, 11 denotes a mechanism chassis, and 12 denotes a cut-and-raised portion having a wide end portion 12a and a narrow guide portion 12b. , 13 is a metal guide pin fixed to the mechanism chassis 11 and stands up, 14 is a coil spring externally attached to the guide pin 13, 15 is an adjustment bracket made of synthetic resin, and 16 is the adjustment bracket 15 Is an adjustment screw that connects the mechanism chassis 11 to the mechanism chassis 11. A shaft end support portion 15a for inserting and supporting one end portion 10a of the screw shaft 10 and a guide pin 13 extending along the thrust direction of the screw shaft 10 are slidably inserted into the adjustment bracket 15. A long hole 15b, a screw insertion hole 15c through which the adjustment screw 16 is inserted, and a substantially T-shaped locking hole 15f having a wide hole 15d and a narrow hole 15e are provided, and both edges of the narrow hole 15e. The portion is a fulcrum portion 15 g that is the center of swinging of the adjustment bracket 15. The wide hole 15d of the locking hole 15f is formed in such a size that the wide tip 12a of the cut-and-raised part 12 can be inserted, and the narrow hole 15e of the locking hole 15f is a narrow guide part of the cut-and-raised part 12. Although it is formed to be slightly wider than 12b, the wide end portion 12a cannot be inserted into the narrow hole 15e. On the other hand, the mechanism chassis 11 is provided with a screwing portion 11a formed with a screw groove at a position facing the screw insertion hole 15c of the adjusting bracket 15, and the adjusting screw 16 is screwed into the screwing portion 11a. By doing so, the adjustment bracket 15 is coupled to the mechanism chassis 11 as shown in FIG. The coil spring 14 urges the adjustment bracket 15 in a direction away from the mechanism chassis 11 as shown in FIG. The coil spring 14 may be externally attached to the adjustment screw 16 instead of the guide pin 13, and a plate spring may be interposed between the adjustment bracket 15 and the mechanism chassis 11 instead of the coil spring.
[0018]
When the adjustment bracket 15 is attached to the mechanism chassis 11, the one end portion 10a of the screw shaft 10 is inserted into the shaft end support portion 15a, the guide pin 13 with the coil spring 14 inserted is inserted into the elongated hole 15b, and After the wide end portion 12a of the cut and raised portion 12 is inserted into the wide hole 15d, the adjustment bracket 15 is slightly slid with respect to the mechanism chassis 11 so that the narrow guide portion 12b of the cut and raised portion 12 is narrowed. Move relatively into 15e. As a result, the adjustment bracket 15 is in a state in which both edge portions (fulcrum portions 15g) of the narrow hole 15e are locked to the wide tip portion 12a of the raised portion 12, and thus the adjustment bracket is used as a fulcrum. 15 is supported in a swingable manner with respect to the mechanism chassis 11. However, the guide pin 13 erected on the mechanism chassis 11 is slidably inserted into the long hole 15b, and the inner wall of the long hole 15b is restricted by the guide pin 13 when the adjustment bracket 15 swings. The swinging direction of 15 is defined by the arrow direction in FIG. 2 (the direction orthogonal to the paper surface of FIG. 3). Therefore, if the adjustment screw 16 inserted into the screw insertion hole 15c in this state is screwed into the screwing portion 11a, the adjustment bracket 15 receiving the elastic force of the coil spring 14 has a screwing amount of the adjustment screw 16. As the number increases, the posture is close to the mechanism chassis 11 side. That is, the adjustment bracket 15 can be attached to the mechanism chassis 11 in a posture in which the shaft end support portion 15a is disposed at a desired height by appropriately moving the adjustment screw 16 back and forth, so that the one end portion 10a of the screw shaft 10 is secured. Can be easily adjusted to set the desired mounting height.
[0019]
Moreover, the adjusting device described above uses the adjusting bracket 15 provided with a long hole 15b, a screw insertion hole 15c, a locking hole 15f and the like on the side of the shaft end support portion 15a, and the holes 15b, 15c and 15f are provided in the holes 15b, 15c and 15f. Since the guide pin 13, the adjustment screw 16, and the cut and raised portion 12 are engaged with each other, and it is not necessary to stack these members in the height direction, the overall height dimension is considerably suppressed. Therefore, this adjusting device does not have a risk of hindering the thinning of the disk device.
[0020]
Further, the adjustment device described above is configured such that the coil spring 14 and the adjustment screw 16 are positioned between the shaft end support portion 15a and the fulcrum portion 15g of the adjustment bracket 15, so that the total length of the adjustment bracket 15 is the shaft end support. It is suppressed to the same extent as the rocking radius of the portion 15a, and the space factor is good. Further, in such a configuration, the distance from the fulcrum 15g to the adjustment screw 16 is shorter than the distance from the fulcrum 15g of the adjustment bracket 15 to the shaft end support 15a. Even when the adjustment amount of the mounting height is large, it can be dealt with by the short adjustment screw 16, and from this point, it can be said that the configuration is suitable for thinning.
[0021]
In addition, when the adjusting device 15 is attached to the mechanism chassis 11, the adjusting device described above can guide the cut and raised portion 12 inserted into the wide hole 15d into the narrow hole 15e. The fulcrum portion 15g of the adjustment bracket 15 is locked by this, so that the adjustment bracket 15 can be held so as to be swingable, and the adjustment screw 16 can be easily assembled in this state.
[0022]
Further, in the adjusting device described above, since the inner wall of the long hole 15b is restricted by the guide pin 13 when the adjusting bracket 15 swings, the swinging direction of the adjusting bracket 15 is accurately defined with a simple configuration. be able to.
[0023]
In this embodiment, a device for adjusting the mounting height of one end of a screw shaft, which is one shaft member that supports the carriage, is described. The same applies to the other end of this shaft member. If the adjusting device is provided, not only can adjustment be performed to ensure parallelism between a pair of shaft members (screw shaft and guide shaft), but also the plane including the axis of both shaft members and the recording surface of the disk are parallel. Adjustment to ensure the degree can also be performed. Further, in order to further improve the detection accuracy, this type of adjusting device may be provided on both of the pair of shaft members so that the respective mounting heights can be adjusted.
[0024]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0025]
The shaft member is provided in parallel to the shaft member without being stacked on the mechanism chassis, and includes an adjustment bracket connected to the mechanism chassis via an adjustment screw, and the adjustment screw is attached to the screwing portion on the mechanism chassis side. When the adjustment bracket swings about the fulcrum by screwing back and forth, the shaft end support portion of the adjustment bracket moves up and down relative to the mechanism chassis, and the shaft end support portion moves to the shaft end support portion as the shaft end support portion moves up and down. Since one end portion of the supported shaft member is moved up and down with respect to the mechanism chassis, the mounting height of these shaft members can be easily adjusted. or an appropriate point of the lateral mounting the adjusting screw to adjust bracket may be or is engaged the mechanism chassis at its fulcrum, the shaft member in the height direction, not stack the members of such adjustment bracket structure By performing the height adjustment of the shaft member, there is no fear that inhibits thinning of the disk device. Further, if the spring member and the adjustment screw are disposed between the shaft end support portion and the fulcrum portion of the adjustment bracket, it is not necessary to enlarge the adjustment bracket, which is preferable in terms of improving the space factor.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an adjusting device for an optical pickup transfer mechanism according to an embodiment of the present invention.
FIG. 2 is a sectional view of the adjusting device.
FIG. 3 is a plan view of the adjusting device.
FIG. 4 is a plan view for explaining an optical pickup transfer mechanism.
[Explanation of symbols]
10 Screw shaft (shaft member)
11 Mechanism chassis 11a Screwed portion 12 Cut and raised portion 12a Wide tip portion 12b Narrow guide portion 13 Guide pin 14 Coil spring 15 Adjustment bracket 15a Shaft end support portion 15b Long hole 15c Screw insertion hole 15d Wide hole 15e Narrow hole 15f Engagement Stop hole 15g Support point 16 Adjustment screw

Claims (4)

A carriage on which the optical pickup is mounted is supported by a pair of shaft members arranged opposite to each other on the mechanism chassis side, and the carriage can be reciprocated along the thrust direction of the shaft members. In the adjustment device of the optical pickup transfer mechanism, which can adjust the mounting height with respect to the mechanism chassis,
An adjustment bracket having a shaft end support portion for supporting one end portion of the shaft member and a fulcrum portion serving as a swing center, and an adjustment bracket arranged in parallel to the shaft member, and the fulcrum portion of the adjustment bracket as the mechanism chassis A locking means for locking to the adjustment bracket, a regulating means for slidingly contacting the adjustment bracket to define the swing direction, and interposed between the adjustment bracket and the mechanism chassis, and the adjustment bracket from the mechanism chassis A spring member that urges in a separating direction, and an adjustment screw that is screwed into a screwing portion provided in the mechanism chassis and connects the adjustment bracket to the screwing portion of the mechanism chassis via the spring member. Prepared,
The spring member and the adjustment screw are disposed between the shaft end support portion and the fulcrum portion of the adjustment bracket,
Wherein the shaft end supporting portion of the adjusting bracket by the adjustment bracket is swung about the fulcrum by threadedly advancing and retracting with respect to the threaded portion of the adjusting screw moves up and down with respect to the mechanism chassis, the said shaft end adjusting apparatus for an optical pickup transfer mechanism in which the one end of the shaft member supported on the shaft end supporting portion with the vertical movement of the support portion is characterized in that the so that the elevator relative to the mechanism chassis.   The optical pickup transport mechanism according to claim 1, wherein a distance from the fulcrum part to the adjustment screw is set shorter than a distance from the fulcrum part to the shaft end support part of the adjustment bracket. Adjustment device.   3. A wide hole and a wide hole through which the wide tip portion of the cut and raised portion can be inserted, and a wide cut and raised portion of the cut and raised portion as the locking means. A locking hole having a narrow hole that communicates with a hole and cannot be inserted through the wide tip is provided in the adjustment bracket, and the cut and raised part is fitted into the narrow hole via the wide hole. An adjustment device for an optical pickup transfer mechanism, wherein the wide end portion engages the adjustment bracket.   4. The length according to claim 1, wherein a guide pin is erected on the mechanism chassis as the restricting means, and extends along the thrust direction of the shaft member and is slidably inserted through the guide pin. An adjustment device for an optical pickup transfer mechanism, wherein a hole is provided in the adjustment bracket.

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