JPS62239462A - Rotating device for disk-shaped recording medium - Google Patents

Abstract

PURPOSE:To rotate a disk with less surface shake by roughening the surface of a turntable on which the disk is put on and which is rotated. CONSTITUTION:A rotating device 50 of a disk-shaped recording medium has a spindle motor 22 as a driving motor which rotates the disk, and a turntable 26 and a aligning member 28 are stuck to the motor shaft of the spindle motor 22, and a positioning recessed member 30 is stuck to the aligning member 28 by a pin 52. A rough surface area 54 is provided on the turntable 26 on which the disk-shaped recording medium is put and which is rotated. Thus, the coefficient of friction between the disk and the turntable 26 is increased to eliminate slipping between the turntable 26 and the disk and the surface shake of the disk, and the disk is immediately rotated at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating device for a disk-shaped recording medium used in an optical information recording/reproducing device.

[Conventional technology]

With the development of today's electronics, optical information recording and reproducing devices that can randomly record, reproduce, and/or erase audio or image information with high performance using light beams such as Rede light have been commercialized. ing. An example of such a device is an optical video disk device, which uses an optical head to digitally detect recorded information consisting of a protrusion (bit) pattern on the surface of a disk-shaped recording medium made of transparent acrylic resin or the like. After photoelectric conversion, R-in adjustment is performed appropriately using an amplifier, and further conversion processing is performed to a predetermined analog amount via a reproducing circuit such as a DA converter.
The signal is output from an output device such as a speaker or a CRT. In this way, the desired sound or color image can be obtained instantaneously and with high performance.

In the optical information recording and reproducing device as described above,
In the past, loading and unloading of disks, which are information recording media, into the apparatus was performed manually, but recently, the loading and unloading of disks has been increasingly automated.

FIG. 3 is a perspective view showing a vertical automatic feeding mechanism for the mounting plate of such an optical information recording/reproducing apparatus.

As shown in the figure, the mounting plate 2 has both left and right end portions bent. A rack 4 is fixed to each bent portion.

Further, the rack 4 is provided with a gear 6 that engages with the rack, and the gear 6 is fixed to the rotating shaft of the motor 8. The motor 8 is supported by support means (not shown). As a result, the mounting plate 2 is attached to the cartridge 12 that accommodates the disk IO by the driving force of the motor 8.
It is possible to move relatively closer or further away. And, this means that the mounting plate 2 shows
-V' direction is often possible. In this way, the mounting plate 2 can be clamped.

Furthermore, in the case of ejecting, the motor 8 can be rotated in the opposite manner to the above, thereby easily ejecting the disc.

Next, a cartridge clamping mechanism in an optical information recording/reproducing apparatus in which the mounting plate 2 as described above is arranged will be explained with reference to FIG. Incidentally, FIG. 4 is a sectional view showing a conventional clamp mechanism.

As shown in the figure, the conventional clamp mechanism has a spindle motor 22 fixed to a base 20 provided in the main body of the optical information recording/reproducing apparatus.

The spindle motor 22 has a motor shaft 24, and a turntable 26 for rotating the disk 10 is fixed to the motor shaft 24.

Further, the motor shaft 24 is provided with a centering member 28, and the disc 10 is aligned with the motor shaft 24 by the centering member 28.
t-center supported. Further, as shown in the figure, a positioning concave member 30 is provided on the spindle motor 22 side, and a positioning convex member 32 is provided on the mounting plate 2 side. The concave portion of the concave member 30 and the convex portion of the convex member 32 are engaged and connected when the disk 10 is clamped.

Further, 34 is a tray, which is provided to support the cartridge 12 which stores the disk 1o inside IfC.

Further, the positioning concave member 30 is normally held in a lifted state by a spring 36, and when a disk is mounted, the spring 36
Due to the contraction of the disc, variations in the inner diameter of the disc and various parts can be absorbed.

Further, the disk 10 rotates at high speed around the rotation axis Y-Y', but since it is supported via the positioning convex member 32't-pairing 40, the rotational movement of the disk is cut by this. , the structure is such that the information is not transmitted to the mechanism above the mounting plate 2.

Further, as shown in the figure, in the past, an elastic member 42 was provided on the turntable 26 as a buffer between the disk 10 and the turntable 26 so that the disk 10 could instantly rotate at high speed.

[Problem that the invention seeks to solve]

However, in the prior art as described above, the motor shaft 24
If the perpendicularity of the elastic member 42 and the flatness of the elastic member 42 are not controlled with strict accuracy, the amount of surface runout of the disk 10 will increase, and if this happens, the focuser of the optical system drive device will control and the tracking sensor will control. This has the problem of making it difficult to carry out.

〔the purpose〕

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a disk-shaped recording device that allows focus and tracking control to be easily performed by achieving a clamping mechanism with less surface runout of the disk. An object of the present invention is to provide a media rotation device.

[Means for solving problems]

According to the present invention, the above object is achieved by a disk-shaped recording medium rotating device, characterized in that a turntable on which the disk-shaped recording medium is placed and rotated has a rough surface.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, embodiments according to the present invention will be described specifically and in detail based on the drawings.

FIG. 1 is a sectional view of a clamp mechanism equipped with a disk-shaped recording medium rotation device according to the present invention.

As shown, the embodiment shown in FIG. 1 is basically the same as the conventional example shown in FIG. The difference is that the elastic member 42 shown in FIG. 4 provided on the turntable 26 is eliminated, and a rough surface area 54 is provided on the turntable 26.

Next, using FIG. 2, an embodiment of a rotating device for a disk-shaped recording medium having a rough surface area f on the turntable 26 will be described.
It will be explained in more detail.

Figure 2 is a perspective view showing an embodiment of a disk-shaped recording medium rotating device according to the present invention.

As shown in the figure, a disk-shaped recording medium rotation device 50 according to the present invention includes a spindle motor 22 that is a drive motor for rotating the disk. A turntable 26 and a centering member 28 are fixed to the motor shaft of the spindle motor 22. Also, the centering member 28
The positioning recessed member 30 is fixedly provided by a pin 52 .

Further, as shown in the figure, the present invention provides a rough surface area 54t-N on a turntable 26 on which a disk-shaped recording medium is placed and rotated. By providing the rough surface area 54 on the turntable 26, the coefficient of friction between the disk and the turntable 26 increases, making it possible to instantly rotate the disk at high speed without the turntable 26 and the disk slipping.

Moreover, as a material constituting the above-mentioned turntable 26,
If it is made of metal such as iron and iron alloys or aluminum and aluminum alloys, the flatness of the surface on the turntable 26 on which the disc is placed and the accuracy of the right angle between the turntable 26 and the motor shaft 24 can be improved. Conventional elastic member 42
Compared to the method of providing

Further, as a processing method for forming this rough surface, a uniform rough surface of about 5 to 30 μm can be formed on the surface portion of the turntable 26 by a simple processing method such as sandblasting, shot blasting, or shot peening.

Next, a comparison between the as-processed turntable 26, that is, the flat surface, and the roughened one will be explained using a table.

Table 1 Table 1 shows the flat surface of the turntable 26 as it was machined and the surface of the turntable 26 with a rough surface.
This figure shows a comparison of the time required for the disk to rotate up to m without slipping.

As shown in the table, when the turntable 26 has a rough surface, it becomes 1/
In a time of 2 to 115 seconds, it becomes possible to rotate the disk instantly without slipping.

〔Effect of the invention〕

As described above in detail and concretely, the present invention makes it possible to reduce the rotation of the disk by a very simple means of roughening the surface of the turntable on which the disk is placed and rotated. can. Additionally, this makes it easier to perform focus and tracking control.

Further, according to the present invention, it is possible to shorten the time required for the rotation of the disk to increase to a predetermined rotation speed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a clamp mechanism equipped with a disk-shaped recording medium rotation device according to the present invention, and FIG. 2 is a perspective view showing an embodiment of the disk-shaped recording medium rotation device according to the present invention.
FIG. 3 is a perspective view of the mounting plate, and FIG. 4 is a sectional view of a conventional clamp mechanism.

Claims (1)

[Claims] (1) A rotating device for a disk-shaped recording medium, characterized in that a turntable on which the disk-shaped recording medium is placed and rotated has a rough surface.