JPH0222833Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a disk clamp structure that is optimal for clamping the disk of a compact disk player to a turntable.

[Background technology] In a compact disk player, a clamper that is movable relative to the tip of the clamp arm by a predetermined amount is brought close to the turntable by the clamp arm's rotation movement in a vertical plane, and a magnet attached to the clamper is moved toward the turntable. The clamper fixes the disk to the turntable by adsorption.

However, with this conventional clamp structure,
The clamper must rotate together with the turntable and disk when they rotate, and must be movable relative to the clamp arm, and must be centered using a positioning mechanism installed between the clamper and the turntable. This clamper is movable relative to the clamp arm by a predetermined amount. For this reason, when the clamp arm tilts and the clamper retreats above the turntable when the disc is inserted or removed, the relative position of the tilted clamp arm and the clamper changes, and when the performance starts, the clamp arm lowers and the clamper presses the disc. In some cases, the clamper may not be centered properly. In addition, it is necessary to adjust the height of the clamp arm in order for the clamper to properly press the disc against the turntable at the start of a performance, and when the clamper is retracted above the turntable, the height of the tip of the clamp arm varies greatly. , which makes designing the player case difficult.

[Purpose of the invention] Taking the above-mentioned facts into consideration, the object of the present invention is to obtain a disk clamp structure in which centering of the clamp member is easy and height adjustment is not necessary.

[Summary of the invention] In the disk clamp structure according to the invention, by vertically lowering the clamp body provided above the turntable using a driving means, it is easy to center the clamp member, and it is possible to move relative to the clamp body in the vertical direction. When the clamp body is lowered, the movable clamp member attached to the movable clamp member is pressed against the turntable to sandwich the disk between the movable clamp member and the turntable, thereby eliminating the need for height adjustment of the movable clamp member.

[Embodiment of the invention] Figs. 1 and 2 show a part of a compact disc player to which a disc clamp structure according to the present embodiment is applied. The main chassis 10 has a turntable 12 whose axis is perpendicular to the center thereof.
is pivoted. This turntable 12 is adapted to be rotated by a disk motor 14 attached to its lower part, and a guide 16 protruding from the upper end surface is for insertion into a central circular hole of a disk 18.

A laser beam is irradiated onto the back surface (bottom surface) of this disk 18 by a reading device (not shown).
The presence or absence of minute pits formed on the back surface of the disk 18 is detected by the reflected light, and signals are thereby read out.

The upper end of the guide 16 has a tapered surface 16 on its outer periphery.
A, and is used for positioning when placing the disk 18 on the turntable 12.

On the main chassis 10 is a roughly gate-shaped sub chassis 20.
is fixed. A clamper base 22 is fixed to the lower center of the sub-chassis 20. This clamper base 22 has a cylindrical shape as shown in FIG.
is accommodated. Like the clamper base 22, this clamper body 24 also has a cylindrical shape with a vertical axis, and three pins 26 protruding radially from the outer circumference are located in guide grooves formed in the inner circumference of the clamper base 22. It is housed in 28. This guide groove 28 is horizontal at both ends in the longitudinal direction, but is inclined at the middle part, so that the pin 26 can move within this guide groove 28 and change its height. That is, the clamper main body 24 is configured to vertically move up and down when rotated about a vertical axis.

A pin 30 is inserted vertically from a part of the clamper body 24.
protrudes and is inserted into a long hole 34 formed at one end of the connect plate 32. Therefore, when the connect plate 32 moves horizontally,
The clamper body 24 is adapted to generate a rotational force about a vertical axis via a pin 30. The end portion (not shown) of the connect plate 32 is connected to a driving means such as a motor, and is driven when the compact disc player starts and ends playing.

An arm 24A is formed at the lower end of the clamper body 24 and projects toward the axial direction.
This arm 24A supports a movable clamp member 36 housed within the clamper body 24. This movable clamp member 36 is movable in the vertical direction relative to the clamper body 24 within the clamper body 24, and has a tapered portion 36B formed inside the outer peripheral end portion 36A. The taper portion 36B has a bottom surface gradually lowered toward the axial center. Therefore, this tapered portion 36B corresponds to the clamper body 24 and has the role of arranging the movable clamp member 36 coaxially with the clamper body 24.

Furthermore, the movable clamp member 36 has a central through-hole inner circumferential surface formed into a tapered surface 36C corresponding to the tapered surface 16A of the guide 16.
When the movable clamp member 36 is lowered, the movable clamp member 36 is centered in correspondence with the tapered surface 16A.

Further, the movable clamp member 36 has a tapered surface 36C.
A ring-shaped magnet 40 is fixed between the tapered portion 36B and the tapered portion 36B. This magnet 40 has the function of being attracted to the turntable 12 with the movable clamp member 36 vertically lowered as shown in FIG. 2, and holding the disk 18 between it and the turntable 12.

Next, the operation of this embodiment will be explained.

When the main switch of the compact disc player is turned on, the connect plate 32 moves horizontally, and the clamper main body 24 rotates about a vertical axis within the clamper base 22. During this rotation, the clamper body 24 moves between the pin 26 and the guide groove 28.
It is descended vertically by the response of .

As a result, as shown in FIG. 2, the movable clamp member 36 descends together with the clamper body 24, and the magnet 40 is attracted to the turntable 12 to clamp the disk 18.

In this way, the movable clamp member 36
8 is clamped on the turntable 12, the movable clamp member 36 is separated from the clamper body 24, so there is no need to adjust the height of the movable clamp member 36. Moreover, even when the movable clamp member 36 rotates together with the disk 18 and turntable 12, it is not restrained by the clamper body 24 and continues to reliably press the disk 18 against the turntable 12. Furthermore, since the movable clamp member 36 is accurately centered relative to the turntable 12 due to the correspondence between the tapered surface 36C and the tapered surface 16A when descending, rotational unbalance is also small.

In particular, since the movable clamp member 36 is vertically lowered, there is little deviation from the axis of the turntable 12, and centering is easy.

When the performance ends, the connect plate 32 is moved horizontally backward, and the clamper main body 24 rises while rotating in the opposite direction. As a result, the arm 24A of the clamper main body 24 engages with the outer peripheral end 36A of the movable clamp member 36, and the movable clamp member 36
is separated from the turntable 12 and lifted upward. This allows the turntable 12 to move in the horizontal direction, allowing the disk 18 to be replaced.

Even in such a raised state of the movable clamp member 36, the tapered portion 36B engages with the arm 24A and centering is performed, so that the deviation from the turntable 12 is made smaller when the movable clamp member 36 is vertically lowered at the start of the next performance. can do.

In addition, as shown in Fig. 3, the connect plate 3
By forming the hinge portion 42 at the intermediate portion of the clamper body 24, the height of the pin 26 provided on the clamper body 24 can be reduced.

Next, FIGS. 4 and 5 show a second embodiment of the present invention.

In this embodiment, a fixed clamp member 44 is attached to the clamper body 24 in correspondence with a movable clamp member 36.
is provided. A magnet 46 is provided on the lower surface of the fixed clamp member 44 in correspondence with the magnet 40 of the movable clamp member 36, and is arranged to apply a repulsive force to the magnet 40.

Therefore, in this embodiment, as shown in FIG. 5, the magnet 40 of the movable clamp member 36 is attracted to the turntable 12 and clamps the disc 18, as in the previous embodiment, but the magnet 46 does not apply a repulsive force to the magnet 40. As a result, the movable clamp member 36 is pressed against the turntable 12 with a larger force.

The rest of the structure is the same as that of the previous embodiment, and the same effects can be obtained.

Next, FIGS. 6 and 7 show a third embodiment of the present invention.

In this embodiment, the magnet 40 in the first embodiment is fixed to the movable clamp member 36 so as to correspond to the center of the turntable 12. Furthermore, a magnet 48 that attracts the magnet 40 is fixed to the turntable 12 at the shaft center, and when the movable clamp member 36 is lowered, the clamp member 3 is attracted by the attraction force between the magnet 40 and the magnet 48.
6 is firmly pressed against the turntable 12.

In this embodiment as well, the other configurations are as follows.
This is similar to the embodiment and similar effects can be obtained.

[Effects of the invention] As explained above, in the disk clamp structure according to the invention, a movable clamp member is provided so as to be movable relative to the clamp body which is vertically moved up and down,
Since this movable clamp member is configured to be pressed against the turntable, centering of the clamp member can be easily performed and height adjustment can be made unnecessary.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a part of a compact disc player to which the disc clamp structure according to the present invention is applied, Fig. 2 is an operation diagram of Fig. 1, and Fig. 3 shows the main parts of Fig. 1. 4 is a sectional view corresponding to FIG. 1 showing a second embodiment of the present invention, FIG. 5 is an operational diagram of FIG. 4, and FIG. 6 is a third embodiment of the present invention. Sectional view corresponding to Fig. 1, No. 7
The figure is an operational diagram of FIG. 6. 12...turntable, 18...disc,
24... Clamper body, 26... Pin, 28...
Guide groove, 36...Moving clamp member, 40, 4
6,48...Magnet.

Claims (1)

[Scope of utility model registration request] A movable clamp member provided above the turntable that fits with the turntable and clamps the disk, a cylindrical clamper body that supports the movable clamp member and has a protrusion on its outer periphery, and a protrusion of the clamper body on the inside. a fixed clamper base provided with a spiral guide groove that engages with the clamper base;
As the clamper body rotates, the clamper body moves up and down, and at the lowered position of the clamper body, the movable clamp member supported by the clamper body is engaged with the turntable, and at the raised position, it is pulled out from the turntable. A disk clamp structure characterized by the following.