JPS5827424Y2 - Disc loading device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disc mounting device particularly suitable for an optical disc recording/reproducing device that performs recording or reproduction by projecting a beam onto a disc-shaped recording medium. The present invention relates to a disc mounting device that can be maintained in a fixed state.

Since the disc does not rotate at high speed in an audio record player, the disc is not normally held by a clamper.

On the other hand, for example, in a free-lapse type video disc player, the disc must be rotated at a high speed of, for example, 1800 r, p, m, and the rotational state and position of the disc relative to the scanning head must be kept constant. Use a clamper to hold the disc.

By the way, it is already known to provide a truncated conical central shaft that engages with the central through hole of the disc in order to mount and rotate the disc, but if the central shaft is steeply sloped, the disc If the central axis is less inclined, it becomes easier to install the disk, but it becomes impossible to install the disk accurately.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc mounting device that can easily and accurately mount a disc.

The present invention to achieve the above object will be described with reference to the reference numerals in the drawings showing the embodiments for easy understanding.
A turntable 1 for supporting and rotating a disk 9
and a disk introduction slope 11 formed to be insertable into the central through hole 10 of the disk 9 with a gentle outer peripheral surface slope angle, and a disk introduction slope 11 having a steeper outer peripheral surface slope angle than the disk introduction slope 11. a centering inclined surface 12 formed to engage with the center through hole 10 of the disk 9, and the diameter of the disk introduction inclined surface 11 and the centering inclined surface 12 increases as they approach the turntable 1; a centering member 5 having a sloped surface and disposed at the center of the turntable 1 so as to be movable in the axial direction of the turntable 1; and the centering member 5 is inserted into the central through hole 10 of the disk 9. a spring 6 biasing the centering member 5 in the direction;
It consists of a stopper 8 that restricts the centering member 5 from moving beyond a predetermined range in the axial direction of the turntable 1 due to the bias of the spring 6, and a clamper 13 that presses the disk 9 against the turntable 1. This relates to a disc loading device.

According to the above invention, the following effects can be obtained.

(a) Since the disk introduction slope 11 with a gentle slope angle and the centering slope 12 with a steep slope angle are provided, the disk 9 can be easily introduced and the disk 9 can be mounted accurately.

That is, if the centering member has a single inclined surface and the angle of inclination is set gently as in the past, it will be easier to introduce the disk, but when the disk is being clamped, for example, by the hand holding the disk. When a lateral force (perpendicular to the axis) is applied to the disk, the disk is displaced laterally, generating a relatively large component of force that pushes down on the centering member, resisting the spring that biases the centering member upward. Then, the centering member is pushed down by the disk, and there is a risk that the disk will eventually be clamped with the centering member being engaged with the center through hole of the disk in a biased manner.

On the other hand, if the slope of the centering member is made steeper, the above-mentioned problems will be alleviated, but it will become difficult to introduce the disk.

In contrast, in the present invention, since the disk introducing inclined sieve 11 with a gentle angle and the centering inclined surface 12 with a steep angle are provided, it is possible to easily introduce the disk 9 to the centering inclined surface 12.

Even if a lateral force is applied to the disk 9 while the disk 9 is engaged with the centering inclined surface 12 and the disk 9 pushes the centering member 5 laterally, the angle of the centering inclined surface 12 is steep. Therefore, the component force in the direction of pushing down the centering member 5 is extremely small.

Therefore, substantially no pressing down of the disc 9 by the centering member 5 occurs, and the disc 9 engages the centering member 5 relatively precisely.

(b) Since the angle of the centering slope 120 is steep and the force of pushing down the centering member 5 based on the lateral force of the disk 9 becomes small, the force of the spring 6 that biases the centering member 5 upward is weakened. becomes possible.

Therefore, there is no need to increase the clamping force of the disk 9 so much.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2 showing a disc loading device for a video disc player according to an embodiment of the present invention, a turntable 1 is connected to a disc motor (not shown).
A raised part 3 is provided in an annular shape so as to surround the recessed part 2.

Further, an annular recess 4 is formed in the turntable 1, into which a centering member 5 is fitted.

The centering member 5 is pressed upward by a compression coil spring 6, but its position is limited by a ring-shaped stopper 8 provided on the center spindle 7.

Centering member 5VcI/i disk 9 shown in FIG.
A disk introduction slope 11 having an outer circumference somewhat smaller than the diameter of the central through hole 10 and having a gentle slope is provided, and a centering slope 12 having a steeper slope than the introduction slope 11 is provided. .

The clamper 13 shown in FIG. 1 includes a knob 14, a ring 15,
It consists of a pressing ring 16.

The suppression ring 16 is pressed by the ring-shaped stopper 1T.
It is fitted into the knob 14 so as not to separate from the ring 15.
is fitted into the pressing ring 16.

The press ring 16 is provided with an annular raised part 18 corresponding to the raised part 3 of the turntable 1.

The raised portion 18 of the pressing ring 16 and the turntable 1
The raised part 3 means that the outer edge 3a of the raised part 3 of the turntable 1 is the outer edge 18a of the raised part 18 of the press ring 16.
It is formed to face the

When mounting the inclined disk 9 on the clamp portion 9a as shown in FIG. 3 using the clamper 13 shown in FIG. 1 and the turntable 1 shown in FIG.
The centering member 5 is inserted into the central through hole 10 of the disc 9, and the center of the spindle 7 and the center of the disk 9 are aligned.

After that, the threaded part 7a of the spindle 7 is screwed into the screw hole 19 of the knob 14, and the knob 14 is turned.
4 in the direction of the turntable 1.

As a result, the edge 18a of the raised portion 18 of the suppression ring 16
is in a state where the upper surface of the disc 1 is pressed, and the outer edge 3a of the raised portion 3 of the turntable 1 and the outer edge 18 of the raised portion 18 of the press ring 16 are pressed. It is as if the disc 9 is being held between the two parts.

At this time, since the one edge 3a and the other edge 18a are opposed to each other, even if the disk 9 is pressed by these edges 3a and 18a, no force that would cause the disk 9 to bend will be applied. do not.

Therefore, the disc 9 will not be distorted and the distance between the beam reflecting surface of the disc 9 and the condensing lens will not change significantly depending on the location.

When this disc mounting device holds a disc that does not have an inclined surface on the clamp part 9a, the main surface of one raised part 3 and the main surface of the other raised part 18 are is pressed against the disk, and the disk is held in surface contact.

As is clear from the above, in the disc loading device of this embodiment, since the disc introduction slope 11 having a gentle slope and the centering slope 12 having a steep slope are provided, the disk 9 can be smoothly inserted by the disk introduction slope 11. The centering slope 12 allows the disk 9 to be accurately positioned.

Further, the centering inclined surface 12 is disposed in the annular recess 4, and the disk holding protrusion 3 of the turntable 1 and the disk holding protruding portion 18 of the clamper 13 are separated from the centering inclined surface 12, so that the turntable 1 and the clamper 13 does not interfere with centering.

Further, the centering member 5 is configured to move up and down,
The distance of the disc retaining ridges 3, 1B from the centering member 5 allows for accurate mounting.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be further modified.

For example, the width of one raised part 3 and the width of the other raised part 18 are not made to match as in the embodiment, but the positions of one outer edge 3a and the other outer edge 18a are made to match. The width of the raised portion 3 or the raised portion 18 may be changed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a clamp of a disc mounting device according to an embodiment of the present invention, FIG. 2 is a sectional view showing a turntable of the first embodiment, and FIG. It is a figure which shows the state which held. In the symbols used in the same drawing, 1 is a turntable, 3 is a raised part, 3a is an edge, 5 is a centering member, 9 is a disk, 13 is a clamper 16 is a pressing ring, 1
8 is a raised portion, and 18a is an edge.

Claims (1)

[Claims for Utility Model Registration] Turntable 1 for supporting and rotating a disc 9
and a disk introduction inclined surface 11 formed to have a gentle outer peripheral surface inclination angle so as to be insertable into the central through hole 10 of the disk 9.
and a centering inclined surface 12 formed to have a steeper outer peripheral surface inclination angle than the disk introducing inclined surface 11 and to engage with the central through hole 10 of the disk 9, and the disk introducing inclined surface 11. and the centering inclined surface 12 is an inclined surface whose diameter increases as it approaches the turntable 1;
a centering member 5 disposed at the center of the turntable 1 so as to be movable in the axial direction; and a spring biasing the centering member 5 in the direction of inserting the centering member 5 into the central through hole 10 of the disk 9. 6, a stopper 8 for restricting the centering member 5 from moving beyond a predetermined range in the axial direction of the turntable 1 due to the bias of the spring 6, and a clamper 13 for pressing the disk 9 against the turntable 1. A disk loading device consisting of and.