JPS5822287Y2 - video disc playback device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a video disc playback device.

Conventionally, video tape recorders have been put into practical use, and television signals are recorded and reproduced on magnetic tape.

This video tape recorder uses a magnetic tape as a recording medium, but recently an apparatus using a record-like video disk as a recording medium has been developed.

In this video disc playback device, the recording medium is a record disc used in an audio device, and when playing this, a format similar to that of a record player as an audio device is adopted.

First, the disc is placed on a turntable, and the pickup section traces the information lines processed on the disc surface.

However, it is not possible to use a device completely similar to the record player as a device for placing the disk, and there are cases where an electric circuit must be formed on the disk and the table.

The present invention was developed in order to address the above-mentioned circumstances, and it is possible to easily form an electrical circuit on the disk without deteriorating the ease of attaching and detaching the disk, and it is possible to easily form an electric circuit on the disk even if the thickness of the disk is changed. It is an object of the present invention to provide a video disc playback device that can be used freely.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3.

That is, in FIG. 1, reference numeral 11 denotes a rotating shaft that is rotated at a predetermined speed, and a turntable 12 is coaxially attached to this rotating shaft 11 so that the shaft protrudes from the upper surface.

This turntable 12 has a ring-shaped recessed spring locking portion 12□ formed around the shaft 11 on the upper surface side.

Further, a protruding base 12□ for supporting the disk is formed on the upper surface at an appropriate rotational radius.

A coiled repulsion spring 1 is attached to the rotating shaft 11.
3 are provided coaxially, and this spring 13 has one end locked in the locking part 12□, and a leaf spring 14 is attached to the shaft 11 so as to press down the other end of the spring 13. .

This leaf spring 14 has a hole in its center through which the shaft 11 can pass, and a front portion 14 . 142 extends near the inner side 1 of the protruding base 1'2°.

Further, a hat-shaped adapter 15 is attached to the rotating shaft 11 from its upper end.

This adapter 5 has a cylindrical portion 15 □ coaxially formed integrally with the upper surface of a disc-shaped flange 15 □, and is attached by placing the cylindrical portion 151 over the rotating shaft 11 .

A screw 16 is screwed into the screw hole of the cylindrical portion 15, thereby fixing the shaft 11.

In addition, this adapter 15 has ball accommodating portions 17 and 18 formed at the peripheral edge of the collar portion 15.

The ball accommodating portion 17, 18 has a hollow shape formed by opening a hole in the axial direction from the circumferential end surface of the flange portion 15°, and has a bottom portion.

And coil-shaped repulsion springs 19 and 2, respectively.
0 is housed, and balls 21 and 22 are housed so as to press down on the springs 19 and 20, and act as a holding part.

In this case, the balls 21, 22 are designed so that a portion thereof is exposed from the end face, as shown in FIG.

That is, 153 is the circumferential end surface of the flange 15, and a portion of the ball 21 is exposed from the housing portion thereof.

Note that it is preferable to provide the ball storage portions, balls, etc. at three or more locations.

The disc 23 is placed on the top of the turntable 12 in the video disc reproducing apparatus configured as described above.

The diameter of the shaft hole 23 provided at the center of the disk 23 is approximately the same as the diameter of the flange 15□ of the adapter 15.

Therefore, when this disc 23 is placed on the turntable 12, the shaft hole 23□ is aligned with the ball 21.
．． 22, but the ball 21.22 moves against the spring 19.20, so that the disc 23
It can pass through the shaft hole 23 of.

When this shaft hole 231 passes through the ball portion, the ball 2
L22 acts so as to return to its original position by the force of springs 19 and 20, and can press the periphery of the shaft hole 23 of the disk 23 with a part of its surface.

Therefore, the positions of the balls 19 and 20 are appropriately selected in consideration of the thickness t of the disk 23.

In the case of traditional octopuses, the extension portion of the leaf spring 14 is also formed so as to abut against the lower surface of the disk 14 with an appropriate elastic force.

According to the video disk reproducing apparatus of the present invention described above, the disk 23 is grounded via the leaf spring 14 at the same time as the disk 23 is placed.

Further, since the adapter 15 is provided and the balls 19 and 20 of this adapter 15 press the disc 23 against the upper surface of the turntable 12, the grounding is more complete and the effect of holding the disc 23 in the housing is also improved. disc 2
3 can be easily obtained without causing any hindrance to attachment and detachment.

In the reproduction of video signals using a disk, there are various methods for recording information on the disk 23, such as a recording method based simply on the direction and strength of the magnetic field of a magnetic medium, and a recording method based on the size of a capacitor capacitance. , the disk is preferably held at its electrical reference potential.

In addition, since it rotates at high speed, it is preferable to also remove unnecessary charges caused by charging.

The present invention solves these problems and contributes to faithful reproduction of video signals and high image quality.

Furthermore, according to the present invention, by appropriately selecting the degree of exposure of the balls 21 and 22 (due to the difference in diameter of the balls), errors in the thickness t of the disk 23 and the diameter of its shaft hole 23□ can be prevented. Even if it happens, you can supplement this and hold it down reliably.

Further, in this case, since the leaf spring 14 is pushed up by the spring 13, there is no change in the grounding effect.

Further, the structure of the present invention is a simple structure in which the adapter 15 and the like are attached to the rotating shaft 11, and can be implemented at low cost.

Note that the means for pressing the disk 23 toward the leaf spring 14 may be constructed as shown in FIGS. 3a and 3b.

That is, in FIG. 3a, 25 is a holding part made of an elastic material formed into a tire shape.

This groove A is formed on the peripheral end surface of the 15° collar portion of the adapter.
It may also be fitted into the

In the case of the same figure, a plurality of tongues 25□ are integrally molded along the outer periphery of a tire-shaped main body 25□, and the holding part 25 is made of an elastic material (for example, rubber).
′.

This can also be used by fitting it into the groove A' of the flange 15□ as in the previous case.

Note that the same parts as in FIG. 1 are given the same reference numerals, and the description thereof will be omitted.

As described above, the present invention can provide a video disc playback device in which electrical circuits can be easily formed without deteriorating the ease of mounting and removing discs.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the video disc playback device of the present invention, Fig. 2 is a perspective view showing the main parts of the invention, and Fig. 3 atb is an explanation showing another embodiment of the disc holding means. It is a diagram. 11...Rotating shaft, 12...Turntable, 13...Spring, 14...
Leaf spring, 15...adapter, 17, 18...ball accommodating section.

Claims (1)

[Claims for Utility Model Registration] In a video disc playback device in which a disc is placed on a rotating shaft protruding from the top surface of a turntable, the center portion is arranged so as to be penetrated by the rotating shaft, and a part of the outer circumference is attached to the turntable. a leaf spring elastically protruding toward the upper surface, a spring that applies a biasing force to the leaf spring toward the upper surface of the turntable, and an adapter having a cylindrical portion having a flange on the outer periphery placed over the tip of the rotating shaft. , a holding part attached to the cylindrical end of the flange, a part of which elastically protrudes toward the outer periphery, and which presses the edge of the center hole of the disc toward the leaf spring. Device.