JPH0627016Y2 - Disk mounting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a disc mounting mechanism in a disc recording / reproducing apparatus, and more particularly to a disc mounting mechanism which facilitates assembly and improves accuracy.

[Prior Art] An example of a disc mounting mechanism in a disc recording / reproducing apparatus will be described with reference to FIG. 2 which is an exploded perspective view.

A turntable 11 is fixed to a shaft 17 of a spindle motor 14, and a guide member 13 that guides the disk to position the disk is slidably inserted into the shaft 17 and held by a retaining means. ing. The guide member 13 is biased toward the free end of the shaft 17 by a compression spring 15 interposed between the turntable 11 and the guide member 13.

When the disc is conveyed to above the turntable 11 by an appropriate disc loading mechanism and then starts to descend, the disc guide hole is guided by the inclined guide face 13a of the peripheral surface of the guide member 13 and centered, When the disc further descends, the guide member 13 also descends and is positioned on the disc support surface 11a of the turntable 11 to be in a recording / reproducing preparation state.

By the way, in the conventional disc mounting mechanism, a peripheral groove 17a is formed in the shaft 17 as shown in FIG. 2 to prevent the guide member 13 from coming off.
It is supported by retaining rings 18 and 18a such as rings, or as shown in FIG. 3, a plurality of screw members 16 are screwed in from the peripheral wall of the turntable 11 so that the tips of the screw members 16 project toward the body portion 13b of the guide member 13. The guide member 13 is held by being engaged with the lower end flange portion 13c of the guide member 13.

[Problems to be Solved by the Invention] However, in the means for forming the circumferential groove 17a in the shaft 17 as the means for preventing the guide member 13 from coming off, as shown in FIG. In addition, since the length tolerance of the shaft 17 is large, there is a drawback in that the stop position dimension of the guide member 13 is difficult to obtain and variation occurs and a predetermined accuracy cannot be obtained.

On the other hand, in the means of FIG. 3, the guide member on the shaft 17 is
In order to secure the free sliding of the guide member 13, it is necessary to set the screwing amount of the screw member 16 and fix the screw member 16 on the way.
There was a drawback that there is a possibility that it will come out.

It is an object of the present invention to provide a disk mounting mechanism which eliminates the above-mentioned conventional drawbacks, facilitates assembly, reduces costs, and ensures assembly accuracy.

[Means for Solving the Problems] The disk mounting mechanism of the present invention is constituted by a turntable fixed to a shaft of a spindle motor, and a slidably fitted insertion into the shaft and a retaining means. A disk comprising a guide member adapted to position the disk by fitting a center hole of the disk to its peripheral surface, and a spring means for urging the guide member toward the free end of the shaft. In the mounting mechanism, as the retaining means, an engaging groove is formed on the inner peripheral surface side of the turntable, and a holding member having a wedge portion that engages with the engaging groove is loosely attached to the body of the guide member. The guide member is slidably held by this holding member by fitting.

[Operation] During assembly, the turntable is fixed to the shaft of the spindle motor by bonding or screwing, while the holding member is loosely fitted to the body of the guide member. A compression spring is inserted into the recess of the turntable via the shaft, and the guide member is inserted from the upper portion of the shaft until the wedge portion of the holding member engages with the engaging groove on the inner wall surface of the turntable.

The retaining member loosely fitted to the body of the guide member is fixed by the wedge portion engaging with the engaging groove of the inner peripheral wall surface of the turntable, but the guide member itself slides freely on the shaft. The upper limit position of the guide member can be set by engaging the holding member with the lower end flange portion of the guide member.

[Embodiment] An embodiment of a disc mounting mechanism according to the present invention will be described with reference to FIG.

In the figure, reference numeral 1 is a turntable, which is fixed to the shaft 7 of the spindle motor 4 by adhesion or screwing. Reference numeral 3 is a guide member for positioning the disk, which is the same as the conventional one and has an inclined guide surface 3a on the peripheral surface and a body portion 3b and a lower end flange portion 3c so as to be slidable on the shaft 7. It is inserted. Reference numeral 5 is a compression coil spring for urging the guide member 3 toward the free end of the shaft 7.

The turntable 1 has the same outer shape as that of the conventional one, but an engaging groove 9 having a substantially V-shaped cross section is formed on the inner peripheral wall surface, that is, the concave peripheral wall surface. Reference numeral 2 is a holding member that is loosely fitted in the body portion 3b of the guide member 3, and is formed to have elasticity by forming a slit portion 2b in a substantially ring shape and a part thereof, and to the upper edge side. A wedge portion 2a that engages with the engaging groove 9 is formed. The holding member 2 is loosely fitted to the body portion 3b of the guide member 3 so that the slit portion 2b is widened, so that the holding member 2 can slide on the body portion 3b.

At the time of assembly, the compression coil spring 5 is inserted into the recess of the turntable 1 via the shaft 7, and the guide member 3 is inserted from the upper end of the shaft 7 and pressed toward the turntable 1. At this time, the holding member 2 enters the recess of the turntable 1 while reducing its diameter, but when the wedge portion 2a reaches the engaging groove 9, the holding member 2 expands by its spring back, and the wedge portion 2a engages. The holding member 2 is fixed by engaging with the mating groove 9. The guide member 3 is biased by the compression coil spring 5 toward the free end of the shaft 7, but the lower end edge 2c of the holding member 2 engages with the lower end flange portion 3c of the guide member 3 to position the upper limit position.

In the disc mounting mechanism configured as described above,
Since the guide member 3 is slidable with respect to the shaft 7 and also with respect to the holding member 2,
When the pressing force acts from above against the elastic force of the compression coil spring 5, it slides freely. Therefore, the disc is centered by being conveyed to above the turntable 1 by a proper disc loading mechanism and descending, and when the disc further descends, the guide member 3 also descends and is positioned on the disc bearing surface 1a of the turntable 1. The recording / playback preparation is completed.

[Advantages of the Invention] According to the disc mounting mechanism of the present invention, the turn is such that the holding member is loosely fitted to the body of the guide member during assembly, and the guide member is inserted from the upper end of the shaft and fixed to the shaft. Since the work of preventing the guide member from coming off is completed simply by pressing in the direction of the table, it is possible to assemble with one touch.

Further, since the holding member is fixed to the turntable and the guide member is positioned by the holding member,
The stop position of the guide member can be secured with high accuracy, and the product does not vary.

Further, unlike the conventional case, it is not necessary to process the circumferential groove on the motor shaft or to perform the screw tightening process, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a disc mounting mechanism according to an embodiment of the present invention with a part cut away, and FIGS. 2 and 3 are exploded perspective views showing a conventional disc mounting mechanism. 1: Turntable, 2: Holding member, 2a: Wedge part 3: Guide member, 3b: Body part, 4: Spindle motor 5: Compression coil spring, 7: Shaft, 9: Engagement groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Ansai 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (56) Reference JP-A-56-124175 (JP, A) -74589 (JP, U) Actually open Sho 59-10191 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A turntable fixed to a shaft of a spindle motor, and the turntable is slidably inserted into the shaft and held by retaining means, and a center hole of a disk is fitted to a peripheral surface of the turntable. In the disk mounting mechanism, which comprises a guide member for positioning the disk by doing so and a spring means for urging the guide member toward the free end of the shaft, the retaining means is a turntable. And an engaging groove formed on the inner peripheral surface side of the guide member, and a wedge portion loosely fitted in the body portion of the guide member to slidably hold the guide member and engage with the engaging groove. And a holding member provided therein.