JP2002092898A - Off-center control mechanism for shaft for optical pickup guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an off-center control mechanism for shaft for optical pickup guide capable of easily moving and fixing a shaft within a small install space in simple configuration. SOLUTION: While using a press spring fastened on a base 25 by a screw 63, a shaft 35 is supported on the side face. On the other hand, a position control screw is fastened into a screw hole 64 provided on the base. On the top end of the position control screw, an eccentric pin 622 is provided at the eccentric position thereof and the side face thereof comes into contact with the side face of the shaft and presses the shaft toward the press spring. When the position control screw is turned, the eccentric pin changes its position and can move the shaft against the elastic power of the press spring or according to the elastic power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an off-center adjustment mechanism for an optical pickup guide shaft used in an optical disk drive.

[0002]

2. Description of the Related Art In order to respond to recent demands for increasing the capacity of optical disks and increasing the speed of access to optical disks, optical disk drives are required to have a highly accurate mechanism. One method for satisfying such demands is to improve the dimensional accuracy of the component. However, it is practically difficult to further improve the manufacturing accuracy of the component as compared with the current situation. Therefore, in this method, only the parts that conform to the higher precision standards are selected from the parts manufactured with the current manufacturing precision, and as a result, the proportion of non-standard products in the part manufacturing is increased. This leads to an increase in cost.

Therefore, as a method of realizing a high-precision mechanism without improving the dimensional accuracy of a part, there has been proposed a method of adjusting a mounting position of a part so as to allow a certain degree of dimensional variation. I have.

For example, Japanese Patent Application Laid-Open No. 10-64207 discloses a horizontal phase adjuster for adjusting the position of a guide shaft of an optical pickup.

As shown in FIG. 10A, this horizontal phase adjuster includes a main body 103 having a stopper 101 and a guide portion 102, an adjusting screw 104 attached to the guide portion 102, and an elastic support portion 105. Have.

The guide section 102 has a guide shaft 106
Is provided with an elongated guide hole 102a for inserting the hole.
The adjustment screw 104 is provided on one of the side walls of the guide portion 102 such that its tip projects into the guide elongated hole 102a. The elastic support portion 105 includes a load 105a.
A spring 105b for biasing the load 105a;
Cap 10 for fixing one end of spring 105b
5c, and the leading end of the load 105a is
It is provided on the other side wall of the guide part 102 so as to protrude into 5a.

According to this horizontal phase adjuster, the guide shaft 106 is connected to the adjusting screw 104 and the elastic support 10.
5 and is fixed in position. Then, by rotating the adjusting screw 104, the position can be changed (moved).

Japanese Patent Application Laid-Open No. H10-64207 also discloses a technique of sandwiching the guide shaft 106 between a pair of eccentric cams (107 in FIG. 10A) in order to finely adjust the position of the guide shaft. ing.

Japanese Patent Application Laid-Open No. 10-64207 further includes an elastic portion 108 protruding from a guide portion and a screw support portion 109 as shown in FIG. A technique of sandwiching the guide shaft 106 between the adjusting screw 110 and the elastic portion 108 is also disclosed.

Japanese Patent Laid-Open Publication No. 2000-20962 also discloses a mechanism for adjusting the displacement in the moving direction for finely adjusting the shaft of the optical pickup.

As shown in FIG. 11, the moving direction shift adjusting mechanism includes a U-shaped groove member 112 for movably supporting the shaft 111, a fixing member 113 provided near the tip of the shaft 111, and A spring member 114 having one end fixed to the fixed member 113 and the other end pressing the side surface of the shaft 111, and rotatably attached to the fixed member 113,
The disk member 115a fixed to the tip of the
And a locking member 115 for locking the shaft 111 against the pressing force of No. 4.

In this mechanism for adjusting the displacement in the moving direction, the locking surface of the disk portion 115a of the locking member 115 is a helically inclined surface, and by rotating the locking member 115, the pressing force of the spring member 114 is reduced. Together, the tip of the shaft 111 can be slightly moved in the left-right direction in the figure.

Further, the applicant has filed Japanese Patent Application No. 11-1775.
No. 10 proposes an off-center adjustment mechanism as shown in FIG.

The off-center adjustment mechanism includes a shaft 1
One end of 21 is fixed with a holding bracket 123 screwed on a support base 122, and the other end is fixed with a pair of bolts 124.

According to the off-center adjusting mechanism, the shaft 12 is rotated by rotating the pair of bolts 124.
1 can be swung right and left.

[0016]

SUMMARY OF THE INVENTION Japanese Patent Application Laid-Open No. H10-6420
The horizontal phase adjuster described in Japanese Patent No. 7 has a problem that the number of parts is large, the configuration is complicated, and the installation space is large.

Also, in the case of using the eccentric cam described in Japanese Patent Application Laid-Open No. H10-64207, it is difficult to adjust (harmony) the angle of the two eccentric cams. After the adjustment, if the screw is fixed (fixed), the eccentric cam is rotated accordingly, and there is a problem that the adjustment is wrong.

Further, the moving direction deviation adjusting mechanism described in Japanese Patent Application Laid-Open No. 2000-20962 also has a problem that its configuration is complicated and installation space is large.

Further, Japanese Patent Application No. 11-1 proposed by the applicant is disclosed.
The off-center adjustment mechanism of No. 77510 cannot move and fix the shaft unless the two bolts are rotated, and unexpectedly requires time and effort for adjustment.

Therefore, the present invention has a very simple structure,
An object of the present invention is to provide an optical pickup guide shaft off-center adjustment mechanism that requires a small installation space and can easily move and fix the shaft.

[0021]

According to the present invention, an optical pickup guide shaft (35) for guiding an optical pickup (23) to move along a predetermined direction is positioned and angled with respect to a base (25). In the off-center adjustment mechanism of the optical pickup guide shaft for holding and fixing in an adjustable manner, a leaf spring (61) for elastically supporting a side surface of the shaft (35) disposed parallel to the base (25). ) And a screw body (62) screwed into a screw hole (64) formed through the base (25).
1) and an eccentric pin (622) protruding at the eccentric position of the tip of the screw body (621) and protruding toward the back side of the base (25), and the side surface of the eccentric pin (622) is A position adjusting screw (62) for pressing the shaft (35) toward the leaf spring (61) by contacting the side surface of the shaft (35); and rotating the position adjusting screw (62). Thus, the position and angle of the shaft (35) can be adjusted by changing the position of the eccentric pin (622), thereby providing an off-center adjustment mechanism for the optical pickup guide shaft.

Here, as the leaf spring (61), a first flat plate portion (611) fixed to the base (25) is used.
And a second flat plate portion (612) continuous with the first flat portion (611) and forming an angle smaller than 90 degrees with the back surface of the base (25). ) Is available.

Further, two sets of the leaf spring (61) and the position adjusting screw (62) may be prepared so as to hold and fix the vicinity of both ends of the shaft (35).

It should be noted that the reference numerals in the parentheses are provided to facilitate understanding of the present invention, and are merely examples.
Of course, it is not limited to these.

[0025]

When the position adjusting screw 62 is rotated, the position of the eccentric pin 622 provided at the eccentric position at the tip thereof changes.
As a result, the shaft 3 that contacts the side surface of the eccentric pin 622
5 is also opposed to the elastic force of the leaf spring 61 or the leaf spring 6
The position is changed according to the elastic force of 1.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, with reference to FIGS. 1 and 2, an optical disc apparatus 10 to which an off-center adjusting mechanism for an optical pickup guide shaft according to the present invention is applied will be described.

The optical disk device 10 is a so-called thin type CD-ROM drive device built in a housing of a notebook personal computer (not shown) or the like. As described later, this type of disk device
Since a disk drive / reproduction mechanism such as an optical pickup, a disk motor, and a turntable is incorporated in the tray 12, it is also called a tray-incorporated disk device. FIG. 1 shows a state in which the tray 12 is housed in a main chassis (outer case) 11, that is, a state in which the tray 12 is located at a disk mounting position, and FIG.
Indicates a state in which the tray 12 is pulled out of the main chassis (outer case) 11, that is, a state in which the tray 12 is located at the disk replacement position.

The optical disk device 10 includes the main chassis 11 and the tray 1 for receiving a CD-ROM disk (hereinafter simply referred to as a disk) (not shown).
2, a sub-chassis 13 supporting the tray 12,
It has a tray sliding mechanism 14 that supports the tray 12 together with the sub-chassis 13 so as to be freely inserted into and removed from the main chassis 11.

The tray 12 can be moved by a manual operation in the directions indicated by arrows A and B in the drawing (the front-rear direction of the main chassis 11) by the operation of the tray sliding mechanism 14. Thus, when the tray 12 is moved in the direction of arrow B, the tray 12 is positioned at the disk mounting position shown in FIG.
If it is moved in the direction of arrow A, it can be located at the disk exchange position shown in FIG.

As shown in FIG. 2A, the tray 12 has a disk facing surface 12a forming a space for receiving a disk, and a pickup and turntable for the pickup and turntable formed in the disk facing surface 12a. Opening 12b
And

The disk facing surface 12a has a lateral width smaller than the outer diameter of the disk, and is about 2/3 of the disk.
Is formed so as to cover the area. as a result,
Although a part of the disk placed on the tray 12 protrudes from the tray 12, the disk device 10 can be reduced in size and thickness.

A front bezel (panel) 15 is fixed to the front end of the tray 12. On the slightly right side of the center of the front bezel 15, a switch button 16 for releasing a lock by a lock mechanism described later when pulling out the tray 12 is provided. When the switch button 16 is pressed in the state shown in FIG. 1, the front bezel 15, that is, the tray 12 pops out from the main chassis 11 by a predetermined amount in the direction A as described later. This facilitates the operation of pulling out the tray 12.

At the rear (back) of the main chassis 11,
A circuit board 17 is provided. In addition, sub chassis 13
The drive unit 18 shown in FIG. As described above, the sub-chassis 13 moves in the directions of arrows A and B together with the tray 12. Therefore, the connection between the drive unit 18 and the circuit board 17 is performed using the flexible board 19 so as not to hinder the movement of the sub-chassis 13.
The circuit board side end of the flexible board 19 is connected to a connector 20 provided on the circuit board 17, and the drive unit side end is connected to a connector (terminal section) 22 provided on a motor base 21. You.

Next, the drive unit 18 shown in FIG.
This will be described with reference to FIGS.

The drive unit 18 includes a base 25 mounted on the sub-chassis 13, a pickup unit 23 movably mounted on the back surface of the base 25, and the pickup unit 23 in a predetermined disk radial direction (arrow in the drawing). (C, D directions), a pickup driving unit 26, a turntable 24, and a turntable 24.
And the like. Further, an off-center adjustment mechanism (described later) of the optical pickup guide shaft of the present invention is also provided on the base 25.

The base 25 is attached to the sub-chassis 13 and fitted into the opening 12b of the tray 12. That is, the surface of the base is used as a part of the tray 12. When the base 25 is attached to the sub-chassis 13, a vibration isolating member 28 is provided between them. The vibration isolating member 28 absorbs vibration generated when the tray 12 is moved, and reduces the influence of the vibration on the nip portion 23 and the turntable 24 attached to the base 25.

Next, with reference to FIGS. 4 and 5, a description will be given of a pickup driving section for realizing the function of moving the pickup section 23 in the directions of arrows C and D in the figure. The base 25 shown in FIGS. 4 and 5 and the base 25 shown in FIGS. 1 to 3 have slightly different shapes, but are essentially the same.

As shown in FIG. 4, a long hole 25a is formed in the base 25 so that the turntable 24 is exposed and the pickup unit 23 can face the disk and can move in a predetermined disk direction. I have. Further, in order to realize a thinner shape, an opening 25b for exposing a part of the motor 29 is formed in the base 25 so that a surface thereof and an outer surface of the motor 29 described later are flush with each other.

On the back side of the base, as shown in FIG.
A pickup driving unit 26 is provided. The nip-up drive unit 26 includes a pickup drive motor 29 having a gear 30 fixed to the drive shaft thereof, and a pickup drive mechanism 3 having gears 31 and 32 engaged with the gear 30.
3, a lead screw 34 driven via the pickup driving mechanism 33, and a lead screw 34
A guide shaft 35 extending parallel to the shaft and guiding the movement of the pickup unit 23;
Off-center adjustment mechanism (Figure 6,
7) and the like.

In the above configuration, the pickup section 23
Is a threaded portion 3 that is threadedly engaged with the threaded portion of the lead screw 34.
6. Further, the pickup section 23 has an arm 37 having a U-shaped groove that engages with the guide shaft 35. As a result, the pickup driving motor 29 rotates, and when the lead screw 34 is rotationally driven via the pickup driving mechanism 33 in accordance with the rotational force, the pickup unit 23 moves in the predetermined disk radial direction (that is, arrow C,
D direction).

Next, with reference to FIGS. 6 and 7, an off-center adjusting mechanism for an optical pickup guide shaft according to an embodiment of the present invention will be described.

As shown in FIG. 6, the off-center adjustment mechanism of the optical pickup guide shaft has a pair of holding springs (leaf springs) 61 and a pair of position adjustment screws 62. These holding springs (leaf springs) 61
The position adjusting screw 62 holds and fixes the vicinity of both ends of the optical pickup guide shaft 35 to the back surface side of the base 25.

As shown in FIG. 7, the pressing spring 61 has a U shape and has two flat plate portions 611 and 612. Then, one flat plate portion 611 is fixed to the base 25 by the fixing screw 63, and the other flat plate portion 612 supports the side surface of the optical pickup guide shaft 35 by its elastic force. Here, the angle formed by the flat plate portion 612 and the back surface of the base 25 is smaller than 90 degrees in order to prevent the optical pickup guide shaft 35 from falling off.

On the other hand, the position adjusting screw 62 is a screw main body 621 screwed and inserted into a screw hole 64 penetrating the base 25.
And an eccentric pin 622 fixed at an eccentric position at the tip thereof
And The length of the eccentric pin 622 is determined such that its side surface is in contact with the side surface of the optical pickup guide shaft 35 supported by the pressing spring 61.

In this configuration, the position adjusting screw 62 is
When rotated counterclockwise or clockwise, the eccentric pin 622
Moves vertically in FIGS. 6 and 7. as a result,
The optical pickup guide shaft 35 includes a holding spring 6.
It moves downward in the figure against the elastic force of No. 1 and moves upward in the figure by the elastic force of the pressing spring 61. In other words, by controlling the amount of rotation of the two position adjustment screws 62, the pressing force of the eccentric pins 621 and 622 against the shaft can be changed, and the optical pickup guide shaft 35 can be vertically translated. Also, the angle of the shaft can be changed.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, in the above embodiment, the CD-
Although a case where the present invention is applied to a ROM drive device has been described as an example, the present invention is not limited to this, and it is needless to say that the present invention can be applied to a CR-R drive device, a CR-RW drive device, and a DVD-RAM drive device. It is.

Further, in the above embodiment, the case where the optical pickup shaft 35 is in direct contact with the base 25 has been described. However, as shown in FIG. 35 can be separated from the back surface of the base 25.

Further, in the above-described embodiment, the example in which the pressing spring has a U-shape has been described. However, the pressing spring may have a shape as shown in FIG. 8 or another shape.

[0050]

According to the present invention, in the off-center adjusting mechanism for the optical pickup guide shaft, both ends of the shaft are elastically supported by leaf springs and fixed at the eccentric position of the tip of the position adjusting screw. By rotating the position adjusting screw by pressing the shaft toward the leaf spring with the eccentric pin, by adjusting the degree to which the eccentric pin presses the shaft, the position and angle of the shaft can be adjusted. Can be adjusted. This makes it possible to adjust the position and angle of the shaft with a simple configuration and without requiring a large space.

[Brief description of the drawings]

FIG. 1 is a perspective plan view showing an example of an optical disc device to which an off-center adjusting mechanism for an optical pickup shaft according to the present invention is applied.

FIGS. 2A and 2B are diagrams showing a state in which a tray of the optical disk device of FIG. 1 is pulled out, wherein FIG. 2A is a transparent plan view, FIG. 2B is a transparent left side view, and FIG.

3A and 3B are diagrams showing a drive unit used in the optical disk device of FIG. 1, wherein FIG. 3A is a perspective plan view and FIG. 3B is a transparent left side view.

FIG. 4 is a plan view for explaining an optical pickup driving section of the optical disk device of FIG. 1;

FIG. 5 is a bottom view for explaining an optical pickup driving section of the optical disk device of FIG. 1;

FIG. 6 is a plan view of an off-center adjustment mechanism of the optical pickup guide shaft according to one embodiment of the present invention.

FIG. 7 is a sectional view taken along line EE of FIG. 6;

FIG. 8 is a sectional view of an off-center adjustment mechanism of an optical pickup guide shaft according to another embodiment of the present invention.

FIG. 9 is a side view showing an example of another shape of the leaf spring used in the present invention.

FIGS. 10 (a) and (b) both show JP-A-10-6
It is a perspective view of the horizontal phase adjuster described in 4207 gazette.

FIG. 11 is a plan view of a moving direction shift adjusting mechanism described in Japanese Patent Application Laid-Open No. 2000-20962.

FIG. 12 is a plan view showing an off-center adjustment mechanism of an optical pickup guide shaft already proposed by the applicant.

[Explanation of symbols]

 25 Base 35 Optical Pickup Guide Shaft 61 Press Spring 611 Flat Plate 612 Flat Plate 62 Position Adjusting Screw 621 Screw Body 622 Eccentric Pin 63 Fixing Screw 64 Screw Hole

Claims (3)

[Claims] An off-center adjusting mechanism of an optical pickup guide shaft for holding and fixing an optical pickup guide shaft for guiding an optical pickup to move along a predetermined direction so as to be position and angle adjustable with respect to a base. A plate spring elastically supporting a side surface of the shaft disposed parallel to the base; a screw body screwed into a screw hole formed through the base; and a tip of the screw body. An eccentric pin projecting at an eccentric position and projecting toward the back side of the base, wherein a side surface of the eccentric pin contacts the side surface of the shaft to press the shaft toward the leaf spring. By rotating the position adjusting screw, the position of the shaft is changed by changing the position of the eccentric pin.
An off-center adjustment mechanism for an optical pickup guide shaft, wherein the angle can be adjusted. 2. A first flat plate portion, wherein the plate spring is fixed to the base, and a second flat plate portion which is continuous with the first flat portion and has an angle of less than 90 degrees with the back surface of the base. 2. A leaf-shaped leaf spring having:
Off-center adjustment mechanism for the optical pickup guide shaft. 3. The apparatus according to claim 1, wherein a pair of said leaf spring and said position adjusting screw are provided, and the vicinity of both ends of said shaft is held and fixed by said leaf spring and said position adjusting screw. Off-center adjustment mechanism for the optical pickup guide shaft.