JPH0348761Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> In this invention, a disk placed on a turntable made of a magnetic material receives an elastic push-up force from below and an attraction force of a magnet provided above. It has a self-aligning function that is located concentrically with the rotation center of the turntable due to the synergistic effect of The present invention relates to a turntable for a disc player equipped with a center spindle for mounting a disc made of resin and having a tapered peripheral surface.

<Prior art> In conventional turntables of this type,
As shown in FIG. 7, a center spindle 02 having a tapered peripheral surface 02A, a spring 05 that elastically moves and urges the center spindle 02 upward, and a pull-out mechanism that prevents the center spindle 02 from slipping out upward. By using the stop washer 06, the entire structure was configured to exhibit the self-aligning function described above.

<Problems to be solved by the invention> In the conventional structure as described above, not only is there a large number of parts and it takes a great deal of time and effort to assemble, but each part is individually manufactured and processed with high precision.
If the center spindle is not assembled with high precision, the desired self-aligning performance will not be obtained.Also, in order to obtain smooth and stable vertical sliding of the center spindle, sufficient consideration must be given to the clearance with the drive rotation shaft and scratches. However, there were drawbacks such as difficulty in managing parts, etc.

<Means for Solving the Problems> In view of the above circumstances, the present invention aims to eliminate the above conventional drawbacks by reducing the number of parts, and in order to achieve this purpose, the disk according to the present invention has been developed. In the player's turntable described in detail at the beginning, the tapered peripheral surface of the center spindle has a plurality of grooves in the circumferential direction that have a diameter larger than that of the tapered peripheral surface in a free state, and that contract as a load is applied. It is characterized by a configuration in which an elastically deformable disk receiving piece is provided on the radial side.

<Function> When using the turntable for a disc player according to the present invention having the above-mentioned characteristic configuration, the turntable body is moved so that the peripheral edge of the center hole of the disc is in contact with and supported by the tapered peripheral surface of the center spindle. When placed at approximately the center position, the weight (load) of the disk acts equally on the plurality of disk receiving pieces in the circumferential direction, and some disk receiving pieces receive a larger weight than others due to eccentricity or inclination. The stop pieces are elastically deformed to the diameter-reducing side and all come to rest in a state where the weight added to the stop pieces is balanced. In this state, the disk is placed concentrically with the center of rotation of the turntable body. and,
Such self-aligning function is similarly exhibited when the diameter of the disk and the diameter of its center hole are within a certain range.

<Example> An example of the present invention will be described below in detail based on the drawings.

1 to 4, 1 is a turntable main body made of a circular plate-shaped magnetic material, and 2 is a center spindle for mounting a disk located at the center of rotation of the turntable main body 1. The spindle 2 has a tapered circumferential surface 2A whose diameter gradually decreases toward the upper end, and a boss portion 2B that can be press-fitted and fixed onto the drive rotating shaft 4 that protrudes upward from the motor 7. The spindle 2 is made of a highly fluid reactive resin such as epoxy resin, for example. When the center spindle 2 is molded with resin, the turntable main body 1 is inserted, and both 2 and 1 are configured to rotate integrally. 3 is the tapered peripheral surface 2 of the center spindle 2
Multiple locations equally spaced in the circumferential direction of A (three locations are shown in the drawing, but there may be four or more locations).
These receiving pieces 3 are in a free state, that is, when the disk d is not mounted and under no load, form a tapered circumferential surface having a larger diameter than the tapered circumferential surface 2A. It is integrally molded with only its upper end connected to the center spindle 2 so that it can be elastically deformed toward a diameter reduction side in response to the load applied when the disk d is mounted. A magnet 8 and its holder 9 are provided directly above the turntable body 1 to exert a magnetic attraction force on the turntable body 1. In the figure, 10 is a disk clamp arm, and 11 is a clamper.

5 and 6 show another embodiment,
The turntable main body 1 and the center spindle 2 are separate bodies, and the center spindle 2 is resin-molded with the disk receiving piece 3.
is dropped into the upwardly open recess 1A formed at the center of rotation of the turntable main body 1 and held therein, and the boss portion 2 of the center spindle 2 is held therein.
Both 1 and 2 are assembled in a state of integral rotation by fitting a protrusion 2b formed protrudingly on the B peripheral wall into a groove 1a formed on the inner peripheral surface of the recess 1A of the turntable main body 1. Compared to the other embodiments, the former embodiment requires only one component and is more advantageous in terms of assembly work and assembly accuracy.

<Effects of the invention> As is clear from the detailed description above, when the present invention is used, when the disc is placed on the turntable, automatic adjustment is performed to position the disc concentrically with the rotation center of the turntable. Since the cardiac function is exerted by the elastic disk receiving piece 3 that is integrally connected to the center spindle 2 itself, the spring that urges the center spindle 2 to slide upward and the retaining washer that counteracts the urging force thereof are required. etc., and the number of parts can be significantly reduced compared to the conventional method. Therefore, not only is assembly extremely easy, but the influence of part manufacturing accuracy and assembly accuracy on desired performance is extremely small, and products with excellent self-aligning performance can be easily and inexpensively manufactured. It can be configured as follows. Furthermore, since there are no moving parts such as slides, parts management is extremely easy.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
Figure 1 is an enlarged perspective view of the main part, Figure 2 is a vertical sectional view of the same, Figure 3 is a plan view of the same, Figure 4 is a longitudinal sectional view of the entire main part, and Figures 5 and 6 are different views. An enlarged longitudinal cross-sectional view and a plan view of the main parts of the embodiment, and FIG. 7 is an enlarged longitudinal cross-sectional view of the main parts of the conventional product. 1 is a turntable main body, 2 is a center spindle, 2A is a tapered peripheral surface, 3 is a disk receiving piece, and 4 is a drive rotation shaft.

Claims (1)

[Claims for Utility Model Registration] A center spindle 2 for mounting a resin disk is provided at the rotational axis of the turntable body 1 and has a tapered circumferential surface 2A that rotates integrally with the turntable body 1 and has a tapered peripheral surface 2A whose diameter gradually decreases toward the upper end. In a turntable for a disc player, the center spindle 2 has a tapered circumferential surface 2A having a diameter larger than that of the tapered circumferential surface 2A in a free state at multiple locations in the circumferential direction of the tapered circumferential surface 2A, and as a result of load action. A turntable for a disc player, characterized in that an elastically deformable disc receiving piece 3 is provided on the diameter reducing side. The turntable for a disc player according to claim 1, wherein the turntable main body 1 is inserted when the center spindle 2 is molded. The turntable for a disc player according to claim 1, wherein the center spindle 2 is press-fitted onto a drive rotation shaft 4.