JPH0142875Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information disc reproducing device, and more particularly to an information disc reproducing device with an improved information disc support member.

[Prior art and its problems] Information disk (hereinafter simply referred to as disk 1)
As shown in FIG. 3, the disc 1 is configured to be stored in a case 2, and after inserting the disk 1 together with the case 2 into an information disc playback device (hereinafter simply referred to as a playback device), the case 2 is By removing the disc, only the disc 1 remains inside the playback device, and by reinserting the empty case 2 into the playback device and then removing the case 2, the disc 1 stored in the case 2 is taken out of the playback device. FIGS. 4 to 8 show the rotary drive unit of the prior art in the information disk reproducing apparatus designed to obtain the information disc.

A motor 12 is fixed to a predetermined position of a base plate 11 fixed to the main chassis 3, a turntable 15 is fixed via a connecting plate 14 near the base end of a rotating shaft 13 of the motor 12, and a turntable 15 is fixed to a base end of a rotating shaft 13 of the motor 12, and a turntable 15 is fixed to a base end of a rotating shaft 13 of the motor 12. A center cap 16 whose outer peripheral surface is tapered to gradually expand downward is provided, and a disk holding lever 17 is swingably provided between the connecting plate 14 and the center cap 16. By elastically installing a spring 18 between the connecting plate 14 and the center cap 16, the center cap 16 is biased in a direction away from the connecting plate 14, and the disk holding lever 17 is bent into a substantially L-shape. At the same time, the bent part is connected to the connecting plate 14 by the shaft 19, and a claw 21 is provided at the upper end to press the inner peripheral edge of the disk 1, and a spring 22 provided at a predetermined position of the connecting plate 14 is connected to a predetermined position on the lower side. When engaged, the upper end of the disk holding lever 17 and the pawl 21 can be inserted into a wide groove 23 bored at a predetermined position on the periphery of the center cap 16. Further, the turntable 15 has annular protrusions 24 and 25 for supporting the disk 1 on the outer peripheral edge and the upper surface of the inner circumference, and three notches 26 are provided on the inner side of the annular protrusion 25. . Incidentally, 27 is a ring for preventing the center cap from falling off.

The elevating section 30 includes a cylindrical section 33 that fits into the motor 12.
A side plate portion is formed by erecting a leg 33' that can be inserted into the notch 26 in a continuous manner with the lift ring 32 that integrally connects the upper ends of the legs, and by bending a predetermined position of the base plate 11 upward. A pair of lift levers 31 are bent into a substantially L-shape and are pivotally connected to the bent portions of the lift levers 31 so as to be able to swing up and down on a shaft 34, and a pin 35 for lifting the lift ring is attached to the tip of the lower side of the lift levers 31. At the same time, a protrusion 36 for pushing down the lift ring is provided at a predetermined position above the pin 35. In one lift lever 31', a long hole is provided in place of the pin 35, and a slider 37 for lifting the lift ring is fitted with a guide pin 38 erected at a predetermined position on the base plate 11 so as to be able to slide up and down. A pin 39 protruding from the position is inserted into the elongated hole. Further, the upper ends of the lift levers 31 are connected to each other by a connecting rod 41, and a pin 42 erected at the center of the connecting rod 41 and the elevating drive section (not shown) are connected to each other by a connecting rod 41.
are connected by a connecting rod 43.

In addition, there is a disk 1 on the top of the leg of the lift ring 32.
A tapered portion 44 having a smaller diameter than the center hole 6 is formed, and a horizontal portion 45 is formed continuous with the tapered portion to support the lower surface of the inner peripheral edge of the disk 1, and a small hole 46 is formed through which the disk holding lever 17 passes. (See Figure 7).

With the above configuration, when reproducing the disk 1, the elevating drive section is set so as not to apply any force to the rotation drive section, so the rotation drive section is connected to the lift ring 32, lift lever 31, etc. Due to its own weight, it will be in the state shown in Figures 4 and 5. When inserting and removing the case 2, the connecting rod 43 is moved by the lifting drive unit.
is pulled with an appropriate stroke in the direction of the arrow in FIG. 2, the lift lever 31 changes its state as shown in FIGS. 4 and 5, and the lift ring 32 rises.

Conventionally, an appropriate gap is provided between the inner surface of the lift ring 32 and the outer surface of the motor 12 so that the lift ring 32 can be moved up and down smoothly. At this time, there will be no problem if the playback device is only installed horizontally and the playback is performed, but in the manufacturing process of the playback device, it is essential to tilt the set when adjusting the various component parts. In Although,
At this time, conventional playback devices had the following drawbacks.

FIG. 8 is a diagram showing the rotary drive unit when the conventional playback device is tilted during playback, and shows the force exerted by the lift ring 32 on the motor 12 or the disk holding lever 17. This figure shows a state in which the motor 12 rotates half a rotation while the lift ring 32 remains on the lower side of the slope. Actually, the disk presser lever 17 and the lift ring 32 are in contact at three points, but only one point will be explained here.

As described above, the lift ring 32 is movable up and down, and is not restricted in any way within a certain range. Therefore, during playback, the lift ring 32 is simply placed on a predetermined position of the disk holding lever 17, and in most cases it is resting on one side by the gap. At this time, there are two forces that the lift ring 32 acts on the motor 12 or the disk holding lever 17: one is due to the lift ring 32's own weight, and the other is the centrifugal force due to the rotation of the motor 12.

When the playback device is tilted at an angle θ from the normal position, a force F acting vertically downward due to the weight of the lift ring 32 causes F sin θ to act in the outer circumferential direction, and a frictional force μ F cos θ to act in the opposite direction. In addition, the lift ring 32
If the centrifugal force exerted by the eccentricity of is f ₁ , then the angle θ
When the angle θ is small, Fsinθ≦μFcosθ+f ₁ , and there is no problem. However, when the angle θ becomes large, Fsinθ>μFcosθ+f ₁ , and the lift ring 3, which was closer to the top of the slope,
2 slides downward. Then, the motor 12 rotates about half a turn and the lift ring 32 slips again, and this is repeated, causing the lift ring 32 to vibrate, and during playback, the vibration of the disk 1 causes abnormal noise and distorts the playback image. Put it away.

[Purpose of the invention] The present invention focuses on the above-mentioned problems, and aims to provide an information disk reproducing device that can reproduce information without any trouble not only during normal reproduction but also when the reproducing device is tilted.

[Example] Fig. 1 shows a lift ring 10 which is the gist of the present invention.
1 is shown. The difference from the conventional lift ring 32 is that a small hole 103 is provided in the cylindrical portion 102.
By providing the convex parts 104, 104 on the inner surface of the cylindrical part, the balance of the lift ring 101 is disturbed by the small hole 103, and when the motor 112 rotates, the lift ring 101 can only be moved in one direction (the opposite direction of the small hole 103). It is placed close together to prevent vibration.

This will be explained in detail below with reference to FIG.

FIG. 2 is a diagram showing the rotational drive unit when the reproducing device is tilted during regeneration using the lift ring 101 of the present invention.
is the motor 112 or disk presser lever 117
It shows the force acting on the motor 112.
The outer surface of the small hole 1 contacts the convex portions 104, 104, and the small hole 1
03 indicates the moment at the bottom of the slope. In addition, the lift ring 101 and the disk presser lever 1
Only one of the contact portions 17 will be explained.

When the motor 112 rotates, the lift ring 101
is constantly pulled toward the opposite side of the small hole 103 due to centrifugal force, and the protrusions 104, 104 and the motor 11
2 outer surface, disk holding levers 117, 11
7, 117 and the lift ring 101 are in contact with each other, and the lift ring 101 is positioned at a position where there is almost no eccentricity. At this time, small hole 103
Assuming that the pulling force in the direction opposite to the small hole 103 is f ₂ , as mentioned above, when the angle θ is small, Fsin θ ≦ μFcos θ + f ₂ and there is no problem, but when the angle θ becomes large, Fsin θ > μFcos θ + f ₂ and the slope The lift ring 101, which had been moved upward, slides downward. Comparing f ₁ and f ₂ here, f ₁ in the conventional example cannot widen the gap due to reasons such as space and reliability of operation, and the force is very small, whereas in the present invention Now, the lift ring 101 is changed by changing the size of the small hole 103.
f ₂ can be freely selected by changing the amount of unbalance. Furthermore, since the absolute value of f ₂ with respect to f ₁ is incomparably large, the sliding angle can also be made several times larger. Therefore, in the conventional playback device, the lift ring 101 shakes when the tilt is approximately 10 degrees, but in this embodiment, the lift ring 101 does not shake even when the tilt is tripled to 30 degrees. At times, disk 1
Since there is no vibration, no abnormal noise is generated or the reproduced image is disturbed, and there is no problem at all when adjusting the various components of this reproduction apparatus.

[Effect of the invention] As explained above, the present invention provides lift ring 1.
By changing only a part of the shape of 01, normal playback is not affected, and when the playback device is tilted, the angle at which the sound is generated and the angle at which the picture is distorted can be significantly improved.

In addition, here we have shown an example of breaking the balance by providing a small hole 103 on one side of the lift ring 101, but the shape is irrelevant, and it can also be done by adding a weight to the other side or using a method that takes advantage of the difference in specific gravity. It is known to be effective.

[Brief explanation of drawings]

FIG. 1 is a plan view and a sectional view of a lift ring showing one embodiment of the present invention, FIG. 2 is a diagram showing the force acting on the lift ring when the playback device is tilted in one embodiment of the present invention, Figure 3 is a partially cutaway perspective view showing the disk stored in the case; Figure 4;
FIGS. 5, 6, and 7 are a plan view and a cross-sectional view showing a rotary drive unit of a conventional example, and FIG. 8 is a diagram showing the force acting on a lift ring when a reproducing apparatus is tilted in a conventional example. DESCRIPTION OF SYMBOLS 1...Disc, 2...Case, 101...Lift ring, 103...Small hole in lift ring cylindrical part, 104...Convex part in lift ring cylindrical part, 112
...Motor, 117...Disc presser lever.

Claims (1)

[Scope of utility model registration request] By inserting the case containing the information disk into the information disk playback device main body, or by inserting an empty case into the information disk playback device main body and then removing it, it is possible to remove the information disk without touching the information disk directly. An information disc playback device that allows an information disc to be attached and removed, characterized in that an information disc reproducing device is provided with a means for unbalancing an information disc support member that moves up and down following the insertion and removal of a case. Disc regeneration device.