JPS62226468A - Clamp device for information recording disk - Google Patents

Abstract

PURPOSE:To reduce the moving distance of an adapter and to make the axial dimension of a device smaller by constituting the device so that a disk recessed part slides on the disk receiving the recessed surface of a turntable and is centered. CONSTITUTION:A rotary shaft 4 is inserted into the inner spheral receiving recessed surface 11 of a disk receiving surface 10a in the turntable 10. A disk 1 is placed on the turntable 1 and pressed by the adapter 5, a centering member 11 is pushed down against a spring 12, and a disk projecting part 9 slides on the recessed surface 11a and is centered. Accordingly the moving distance of the adapter 5 is reduced to make the axial dimension of the device smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Commercial Application] The present invention relates to an information recording disc clamping device for removably inserting and clamping an information recording disc onto a rotating shaft of a motor.

[Conventional technology]

FIG. 3 is a partially cutaway side view showing a conventional clamping device for an information recording disk disclosed in, for example, Japanese Patent Application Laid-open No. 54-151404. In the figure, (1) is a circular center hole (2).
An information recording disc (hereinafter referred to as a disc), (3
) is a turntable, (4) is a rotating shaft of a motor (not shown), (5) is an adapter, (6) is a centering cup, (force is a spring, and (8) is a retaining ring.

Next, the operation will be explained. Centering cup (6)
Although not shown in the figure, under normal conditions (when the disc (1) is detached), it is pushed upward by the force and is stopped by the retaining ring (8). At this time, the top surface of the centering cup (6) is attached to the turntable (3). ) is located above the top surface (3a) of the turntable (
When the disk (1) is pushed down in the direction of 3), the centering cup (6) sinks downward against the spring (7), and the disk (1) comes into contact with the upper surface (3a) of the turntable (3). When the adapter (5) further descends, the disk (1) is sandwiched and fixed between the adapter (5) and the top surface (3a) of the turntable (3). When the disk (1) is clamped (when the disk (1) is inserted), the center hole (2) of the disk (1) is placed on the tapered part (6a) of the centering cup (6) as shown in the figure, and the disk The center of (1) almost coincides with the center of rotation axis (4).

[Problem that the invention seeks to solve]

In the conventional information recording disc clamping device of this type, the tapered part (6a) of the centering cup (6) is located above the upper surface (3a) of the turntable (3), and the retaining ring (8) is further positioned above the upper surface (3a) of the turntable (3). Since it is located above, when moving the disk (1) horizontally from side to side and installing it approximately at the center of rotation, the adapter ( 5) must be located considerably above the top surface (3a) of the turntable (3).

Therefore, there is a problem in that the amount of movement of the adapter (5) becomes large and the axial dimension of the device becomes large.

This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a clamping device for an information recording disk that can reduce the axial dimension of the device by reducing the amount of movement of the adapter. do.

[Means for solving problems]

The clamping device for an information recording disk according to the present invention includes a cylindrical or cylindrical convex portion provided near the center of the information recording disk, and a ring-shaped disk receiving portion fixed to a rotating shaft and perpendicular to the rotating shaft. a turntable having a surface on the outside of the convex portion; a recess formed on the inside of the ring-shaped disk receiving surface of the turntable; a centering member having a conical or spherical protrusion-receiving concave surface that is rotationally symmetrical with respect to the rotation axis; and a spring that urges the centering member to the initial position where the centering member does not protrude from the disk-receiving surface of the turntable. and an adapter that presses and holds the information recording disk against the disk receiving surface of the turntable.

[Effect]

In this invention, the adapter provides information;
=1 口 藀し ze 1 (1 口 し ま η -人じ 台 a okogu m biaru MJ'L 類 1r
When the μ-centering member moves against the spring, the convex part of the information recording disk slides on the convex receiving concave surface of the centering member, and this sliding of the convex part causes the center of the information recording disk to move to the center of the rotation axis. The information recording disk is centered so that it coincides with the .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Fig. 1 is a side view with the left half broken off showing the state before the disk is clamped, and Fig. 2 is a side view with the left half broken off showing the state when the disk is clamped. are given the same reference numerals and the explanation will be omitted.

In the figure, (9) is a cylindrical protrusion provided near the center of the disk (1), and (10) is a turntable fixed to the rotating shaft (4), with a ring perpendicular to the rotating shaft (4). It has a disk-shaped disk receiving surface (10a) on the outside of the convex portion (9), and a recess (Job) on the inside of this disk receiving surface (10a).
)have. (11) is a centering member that is movably fitted to the rotating shaft (4); IC4
) versus 1. τI'i5'I The cylinder has a protrusion receiving concave surface (lla) with a circular surface shape, and a concave portion (10b) which is prevented from protruding from the disk receiving surface (10a) by a retaining ring (8).
) is contained within. (12) is the centering member (
11) to the initial position regulated by the retaining ring (8), and is provided in the recess (10b).

Next, the operation will be explained. In the state before the disc (1) is clamped, the centering member (]
1) is housed in the recess (IOb) of the turntable (10), and the retaining ring (8) and the head of the rotating shaft (4) are housed in the convex receiving concave surface (Ila) of the centering member (11). Therefore, nothing protrudes from the disc receiving surface (10a) of the turntable (10). Therefore, the adapter (5) is connected to the disc receiving surface (1) of the turntable (10).
0a) at a distance that allows the disk (1) to be inserted therebetween. When the disk (1) is inserted as shown in FIG.
) is the convex receiving concave surface (Ila) of the centering member (11).
)get on. By lowering the adapter (5), the disc (1)
) is pressed, the centering member (11) and the spring (
12) Move downward from the initial position shown in Figure 1 against f4s.

At this time, the convex portion (9) of the disk (1) slides on the convex portion receiving concave surface (lla) of the centering member (11), and the disk (1) is centered. Finally the disk (1)
is fixed between the turntable (10) and the disk receiving surface (10a) by the adapter (5) in a centered state as shown in FIG.

When the adapter (5) rises from the state where the disk (1) is clamped as shown in Figure 2, the centering member (11) rises due to the restoring force of the spring (12) and returns to the initial position shown in Figure 1. , the disk (1) can be taken out freely.

In the above embodiment, the convex portion (9) of the disk (1) is shown as having a cylindrical shape, but it may also have a cylindrical shape. - Also, although a spherical surface is shown as the convex receiving concave surface (Ila) of the centering member (11), it may be conical.

〔Effect of the invention〕

As described above, the present invention has the effect that the axial dimension of the device can be made smaller because the amount of movement of the adapter can be reduced.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, and Fig. 1 is a side view of the left half cut away showing the state before the disk is clamped; The figure is a partially cutaway side view of a conventional device. In the figure, (1) is an information recording disk, (4) is a rotating shaft,
(5) is an adapter, (9) is a convex part, (10) is a turntable, (10a) is a disk receiving surface, (10b) is a concave part, (11) is a centering member, (11a) is a convex part receiving surface. The concave surface (12) is a spring. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney (Fig. 1, 7, Table 70a, Rotating shaft 5, Adapter 96, Table 70a, 9 disc receiving surface vb: recess 72, Ill')

Claims (2)

[Claims] (1) In an information recording disk clamping device that clamps an information recording disk by removably inserting it into a rotating shaft of a motor, a cylindrical or cylindrical convex portion provided near the center of the information recording disk; a turntable having a ring-shaped disk-receiving surface fixed to a rotating shaft and perpendicular to the rotating shaft on the outside of the convex portion; a recess formed inside the ring-shaped disk-receiving surface of the turntable; a centering member having a conical or spherical protrusion-receiving concave surface that is fitted onto the rotating shaft so as to be movable in one direction from its initial position and is rotationally symmetrical with respect to the rotating shaft; a spring that biases the information recording disk to the initial position where it does not protrude from the disk receiving surface of the turntable; and an adapter that presses and holds the information recording disk against the disk receiving surface of the turntable; is pressed and the centering member moves against the spring by the convex portion of the information recording disk, the convex portion of the information recording disk slides on the convex receiving concave surface of the centering member. A clamping device for an information recording disk, characterized in that the information recording disk is centered so that the center of the information recording disk coincides with the center of the rotating shaft. (2) The information recording disc clamping device according to claim 1, wherein the head of the rotating shaft does not protrude beyond the centering member.