JPH0831115A - Positioning mechanism for read mechanical part in disk player - Google Patents

Abstract

PURPOSE:To easily and surely position a read mechanical part loading an optical head for reading a disk signal onto a prescribed position in a disk player. CONSTITUTION:This mechanism is constituted so that the read mechanical part 7 is positioned by fixing a stepped shaft 8 to the read mechanical part 7, and inserting and engaging the stepped part 16 of the shaft 8 into an engagement recessed part 20 of a support member 17 fixed to a base part 2a. The support member 17 is provided with a leaf spring 22, and the play of the shaft 8 is prevented by pressing the end surface of the shaft 8 with the leaf spring 22 in the state where the stepped part 16 of the shaft 8 is engaged with the engagement recessed part 20 of the support member 17, and the read mechanical part 7 is positioned precisely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning mechanism for positioning a reading mechanism portion, which is equipped with an optical head for reading a signal of a disc, at a predetermined position in a disc player.

[0002]

2. Description of the Related Art First, a schematic structure of a disc player will be briefly described with reference to FIG. In the figure, 1 denotes a disc player as a whole and 2 denotes this disc player 1.
Chassis 3 is a spindle motor fixed to the base portion 2a of the chassis 2, 4 is a turntable attached to the spindle shaft of the motor 3, and a disk (optical disk) 5 is placed on the turntable 4 It is adapted to be rotated by the drive of 3.

A reading mechanism section (block) 7 having an optical head 6 for reading a signal recorded on the disk 5 is supported by the base section 2a so as to face the signal recording surface of the disk 5. In addition to the optical head 6, a shaft for guiding the optical head 6 and a motor for head feeding are built in the block of the reading mechanism section 7. The optical head 6 drives the disk to drive the disk. As the disk 5 is rotated, the disk 5 is moved in the radial direction, and the signal recording surface of the disk 5 is irradiated with laser light from the objective lens portion 6a, whereby the signal of the disk 5 is read and reproduced.

In the disc player having such a structure, the optical head 6 is rotated with respect to the center of rotation of the disc 5.
If the moving axis of the (objective lens 6a) is deviated, the signal cannot be read accurately. Therefore, the position of the reading mechanism section 7 must be adjusted (so-called RD adjustment) so that the moving axis of the optical head 6 exactly coincides with the rotation center of the disk 5.

FIG. 2 shows an example of a conventional positioning mechanism for the reading mechanism section. A shaft 8 extends through the reading mechanism unit 7 in a direction orthogonal to the movement axis of the optical head 6, and the shaft 8 is completely fixed to the reading mechanism unit 7.
On the other hand, on the base portion 2a, a pair of support fittings 9 and 10 located on both left and right sides of the reading mechanism portion 7 are fixed by screws 11 and 12, respectively, and the shaft holes 9 of the support fittings 9 and 10 are fixed.
The shaft 8 is supported by a and 10a so as to be slidable in the axial direction and rotatable in the circumferential direction.

Further, a stopper 13 is fixed to the base portion 2a by a screw 14 corresponding to the extension portion 8a at one end of the shaft 8, and the reading mechanism portion 7 is extended by a spring member 15 to extend the shaft 8. The end face of the portion 8a is pressed against the stopper 13 in a pressure contact manner, thereby positioning the reading mechanism portion 7.

Although not shown in the drawing, the reading mechanism section 7
An inclination adjusting mechanism is configured between the base 2a and the base portion 2a. When the warp of the disc is detected, the inclination adjusting mechanism automatically operates and the reading mechanism portion 7 moves up and down with the shaft 8 as a fulcrum. Inclination in the direction is performed, and adjustment (so-called skew adjustment) for keeping the angle of the optical head facing the disk constant is performed by this.

[0008]

In the conventional positioning mechanism of the reading mechanism section as shown in FIG. 2 described above, when the reading mechanism section 7 is assembled, the work of mounting the spring member 15 is troublesome, and repairing or the like is required. Therefore, when the reading mechanism section 7 is removed, the spring member 15 must also be removed, that is, the reading mechanism section 7 cannot be easily attached and detached. The present invention has been made with the object of remedying such drawbacks.

[0009]

That is, the present invention is a mechanism for positioning a reading mechanism portion, in which an optical head for reading a signal of a disc in a disc player is mounted, at a predetermined position. A shaft having a small-diameter step portion at the end thereof, a holding member having an engaging concave portion fixed to the base portion of the disc player and engagingly holding the step portion of the shaft, and a holding member on the holding member. And an elastic pressing body that presses the shaft so that the shaft does not rattle when the stepped portion is engaged with the engaging concave portion.

[0010]

In the mechanism of the present invention having the above-described structure, the reading mechanism portion is securely positioned and held at the predetermined position only by engaging the stepped portion of the shaft with the engaging recess of the holding member. It can be easily attached and detached.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. First, in the present example, the support structure of the reading mechanism section 7 with respect to the base section 2a is configured in the same manner as in the conventional example of FIG. 2 described above.

That is, a shaft 8 penetrates and is fixed to the reading mechanism section 7 at right angles to the movement axis of the optical head 6, and on the other hand, on the base section 2a, a pair of supporting members are provided on both left and right sides of the reading mechanism section 7. The metal fittings 9 and 10 are fixed by screws 11 and 12, respectively, and the shaft holes 9a and 10a of the support metal fittings 9 and 10 are fixed.
Further, the shaft 8 is inserted and supported so as to be slidable in the axial direction and rotatable in the circumferential direction.

In this example, the extension 8a of the shaft 8
A step portion 16 having a small diameter is formed at the tip of the step portion 1.
6, the shaft 8 is engaged with the holding member 17 fixed on the base portion 2a, whereby the reading mechanism portion 7 is positioned.

The holding member 17 is constructed as follows (see FIG. 5). Reference numeral 18 is an L-shaped holding plate as a substrate of the holding member 17, and the holding plate 18 is a horizontal plate portion 18 thereof.
The vertical plate portion 18b corresponding to the shaft 8 is fixed to the base portion 2a by a screw 19 at a, and a groove-shaped engagement concave portion 20 vertically cut from an upper end edge of the vertical plate portion 18b is formed. ing.

The engaging recess 20 is formed with a groove width substantially equal to the diameter of the step 16 of the shaft 8. By inserting the step 16 into the engaging recess 20 from above and engaging the step. The shaft 8 is held by the holding member 17. still,
In this structure, the step portion 16 of the shaft 8 has the engagement recess 2
The holding plate 18 is formed to have a width (length) larger than the thickness of the holding plate 18 so that the shaft 8 can be easily inserted into the holding member 18. Therefore, the shaft 8 is held by the holding member 17 with a play in the axial direction. .

Further, in the holding member 17, a U-shaped mounting base 21 is fixed on the horizontal plate portion 18a of the holding plate 18, and a leaf spring 22 as an elastic pressing body is fixed to the mounting base 21 by a screw 23.
Installed by. As shown in the drawing, the leaf spring 22 has a shape in which the tip portion is bent in a V shape, and the step portion 16 of the shaft 8 is engaged with the engaging recess 2 of the holding member 17.
In the state of being engaged with 0, the vertex of the V-shaped bent portion of the leaf spring 22 elastically presses the tip end surface of the shaft 8, and the elastic pressing force of the leaf spring 22 causes the inside of the step portion 16 of the shaft 8 to move. The end face is pressed against the holding plate 18, which causes the shaft 8
Is engaged and held in a stable state without rattling with the holding member 17.

A pair of guide elongated holes 24a and 24b are formed in the horizontal plate portion 18a of the holding plate 18 of the holding member 17 with the screw 19 interposed therebetween, and correspondingly, guides are formed on the base portion 2a side. Protrusions 25a and 25b are provided in a protruding manner, and the guide protrusions 25a and 25b are engaged with and guided by the guide slots 24a and 24b, so that the holding member 17 has a range of length of the guide slots. It is adapted to be linearly moved inside along the axial direction of the shaft 8.

In the disc player having the mechanism of this example configured as described above, when the reading mechanism section 7 is assembled to the base section 2a, first, the engaging concave section 2 of the holding member 17 is assembled.
0 is engaged with the step portion 16 of the shaft 8, and then the support fittings 9 and 10 are fixed to the base portion 2a by screws 11 and 12, respectively (the support fittings 9 and 10 are assembled to the shaft 8 in advance).

In this way, the reading mechanism 7 is connected to the base 2
After assembly to a, the movement of the reading mechanism 7 is adjusted. That is, when the screws 19 of the holding member 17 are not completely tightened (the holding member 17 is movable), the holding member 17
Since the reading mechanism section 7 is also movable in the axial direction of the shaft 8 integrally with the reading mechanism section 7, the reading mechanism section 7 is moved to a predetermined position (position where the moving axis of the optical head 6 coincides with the rotation center of the disk) in this state. The movement is adjusted, and when this adjustment is completed, the screw 19 is completely tightened to fix the holding member 17.

Then, the reading mechanism section 7 is detached from the base section 2a for repair or the like, and then the reading mechanism section 7 is again mounted.
At the time of assembling to the a, only by engaging the stepped portion 16 of the shaft 8 with the engagement concave portion 20 of the holding member 17 without performing the above-described adjustment work, positioning of the reading mechanism portion 7 can be performed easily and reliably. Is performed. That is, in this example mechanism,
First, once you have adjusted the position of the reading mechanism 7,
After that, no matter how many times the reading mechanism unit 7 is detached and assembled (attached / detached), the positioning is accurately performed with one touch without requiring adjustment each time.

As described above, in the mechanism of this embodiment, the reading mechanism section 7 can be easily attached and detached. Particularly, in this example, since the leaf spring 22 as an elastic pressing body that presses the shaft 8 is provided on the holding member 17, it is troublesome to attach and detach the reading mechanism section 7 as in the conventional example of FIG. 2 described above. Since it is not necessary to carry out the work of suspending and removing the spring, it is possible to easily attach and detach the reading mechanism unit 7 as compared with the conventional case.

Further, in the mechanism of this embodiment, since the step portion 16 of the shaft 8 is formed to have a width larger than the plate thickness of the holding plate 18 of the holding member 17, the step portion 16 is engaged with the recess 20.
Since it is easy to insert it when it is engaged with, the reading mechanism 7 can be positioned more easily. With the above configuration, the shaft 8 is held with a play with respect to the holding member 17. In this state, the end surface of the shaft 8 is pressed by the leaf spring 22 so that the shaft 8 is held.
Since it is stably fixed and held without rattling, even if a shock is applied, the influence of the shock on the reading mechanism section 7 is not magnified.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above embodiments. For example, in the embodiment, a leaf spring is shown as the elastic pressing body that pushes the shaft 8, but various spring members other than this leaf spring can be used. Also the base 2
As a fixing means of the holding member 17 with respect to a, a screw 19 is used.
It is not limited to

[0024]

As is apparent from the above embodiments, in the mechanism of the present invention, the reading mechanism portion is reliably positioned and held at a predetermined position only by engaging the stepped portion of the shaft with the engaging recess of the holding member. Therefore, the reading mechanism section can be easily attached and detached.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of a disc player.

FIG. 2 is a perspective view showing a conventional example of a positioning mechanism of a reading mechanism section.

FIG. 3 is a perspective view showing an embodiment of a positioning mechanism of a reading mechanism section.

FIG. 4 is a front view of the same.

FIG. 5 is an enlarged perspective view of a holding member in the example.

6A and 6B are explanatory views of positioning in the embodiment, where A is a state before the shaft is engaged with the holding member, and B is a state in which the shaft is engaged and held by the holding member.

[Explanation of symbols]

 1 Disc Player 2 Chassis 2a Base Part 5 Disc 6 Optical Head 7 Reading Mechanism Part 8 Shaft 16 Step Part 17 Holding Member 18 Holding Plate 19 Screw 20 Engagement Recess 22 Leaf Spring (Elastic Pressing Body)

Claims (1)

[Claims] 1. A mechanism for positioning at a predetermined position a reading mechanism portion on which an optical head for reading a signal recorded on a disc in a disc player is mounted, the mechanism being fixed to the reading mechanism portion and having an end. A shaft having a small-diameter step portion, a holding member fixed to the base portion of the disc player and having an engaging recess for engaging and holding the step portion of the shaft, and a holding member provided on the holding member. A positioning mechanism for a reading mechanism section in a disc player, which comprises an elastic pressing body that presses the shaft so that the shaft does not rattle when the step portion is engaged with the engaging recess.