JPS6059564A - disk mounting device - Google Patents

Abstract

PURPOSE:To reduce the device in size and cost by arranging the upper surface of a disc setting board concentric with a rotary shaft on an energizing position upper than the upper part of a turn table at the unloading of the disc. CONSTITUTION:A conical gap 29 is fitted to the rotary shaft 27 of a spin motor 2, the disc setting table 30 is inserted into the periphery of the gap 29, and at the unloading of the disc, the disc setting table 30 is located upper than the upper part of the turn table 28 by energizing springs 32, 33. Since the gap 29 is formed like a cone, the center of the disc 8 pressed by a weight 17 coincides with the rotary shaft 27 precisely and the disc is loaded on the turn table 28 without eccentricity. Since a driving source for driving the disc setting board 30 is unnecessary, the device can be reduced at its size and cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a disc mounting device used for digital audio discs (DAD) and the like.

<Prior art> For example, in a CD player, a disk on which pits are formed in response to information signals is rotated on a turntable, and a laser beam is irradiated onto the pits on the disk, and a laser beam is emitted based on the reflected light. The presence or absence of pits on the disc is detected by using the disc, and the detection output is reproduced as an information signal. In such a CD player, it is necessary to focus a laser beam onto the pits in order to accurately detect the presence or absence of pits. Therefore, conventionally, the distance between the laser beam irradiation source and the disk is kept constant so that the laser beam can always be efficiently focused on the pit. By the way, in order to keep the above distance constant, the laser beam irradiation source is moved horizontally with respect to the disc, so the disc must be mounted horizontally on the turntable without eccentricity. .

For this reason, conventionally, driven disk mounts are provided above and below, the disk is placed on this -L, and during playback, the disk mounts are pushed down below the turntable to mount the disk on the turntable. Such a conventional disk loading device requires only one drive source to drive the disk mounting table in ten directions, which has the disadvantage of increasing the size and cost of the device.

<Purpose> The present invention has been made in view of the points mentioned above,
The purpose is to reduce the size and cost of a disk loading device.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings. This embodiment will be described with application to a CD player. FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the section line 1--2 in FIG. The moving chassis 1 is provided with a spin motor 2 for rotating the turntable 28, and is movable in the directions of arrows 34 and 35 (horizontal direction in FIGS. 1 and 2).
In the figure and FIG. 2, the mobile chassis 1 is replaced by the fixed chassis 1.
3 Indicates the state of being outside. Both ends of a pair of moving rails 4 extending in parallel are supported by rail fixing angles 5, and the rail fixing angles 5 are fixed to the moving chassis 1 via hooks 6. As a result, the moving chassis 1 and the moving rail 4 are integrally displaced. A disk 8 is placed on a turntable 28 above the spin motor 2.

A loading motor 9 is fixed to the rail fixing angle 5 on the side of the fixed chassis 13, and a pinion 10 is fixed to a rotating shaft 9a below the loading motor 9. This pinion 10 meshes with a rack 11 of a guide means 37 that guides the movable chassis 1 and the like. A pair of arm fulcrum angles 14 are provided on both sides of the fixed chassis 13 in the width direction (lower direction 1 in FIG. 1), and the arm 15 is attached to the shaft 1 fixed to the arm fulcrum angles 14
It is supported for angular displacement around 6 rotations. A weight 17 for pressing the disk 8 is provided at the end of the arm 15 on the moving chassis 1 side, and an arm roller 18 is provided at the other end to control the displacement of the guide means 37 as described later. Accordingly, this arm roller 18 rotates and the arm 15 is angularly displaced. The guide means 37 has a pair of elongated holes 40.41 as shown in FIG.
Pins 42 and 43 formed on the fixed chassis 13 are inserted through the holes. This allows the guide means 37 to
1 in the directions of arrows 34 and 35. A lock lever 20 for regulating the displacement of the moving rail 4 and the guide means 37 is provided near the end of the rack 11 on the moving chassis 1 side.

FIG. 3 is an enlarged plan view of the vicinity of the lock lever 20, and FIG. 4 is a side view of FIG. 3. A roller 21 is interposed between the moving rail 4 and the fixed rail 19, and the rollers 21 enable the moving rail 4 to be smoothly displaced from the fixed rail 19. The lock lever 20 is provided with a rail fixing pin 22 and a rack fixing pin 23, respectively.
0 can be angularly displaced around the rack pin 24 provided on the fixed shear 713. The lock lever 20 has a spring 25
is biased in the direction of arrow 26.

FIG. 5 is an enlarged cross-sectional view of the vicinity of the spin motor 2. FIG. It shows a state in which the weight 17 is pressed, that is, when it is installed.

In the disc mounting device according to the present invention, a cylindrical turntable 2B with a bottom is attached to the rotating shaft 27 of the spin motor 2, so that the rotating shaft 27 is inserted into the turntable and the end of the rotating shaft faces from the opening of the turntable. A conical cap 29 with a rotation shaft insertion hole is attached to the rotation shaft 27, and the rotation shaft 2 is fixed to the rotation shaft 27 with their central axes aligned with each other.
A cylindrical disc holder 30 is inserted between the outermost circumferential surface of the cap 29 and the inner circumferential surface of the turntable 28, and the center axes of the disc holder 30 and the rotating shaft 27 are aligned with each other. Align and insert the cap 29, the disc holder 30, and the inner bottom surface 3 of the turntable 28.
1 are provided with springs 32 and 33 as means for biasing each of them individually in the axial direction of the rotating shaft 27, and the disc mounting stand 30 is placed above the top of the turntable 28 when no disc is mounted. It is configured to be in a biased position.

Since the disk mounting table 30 has a cylindrical shape, it is possible to place the disk 8 horizontally as shown in FIG. 5(a). Further, the disk mounting stand 30 and the cap 29 are individually biased by springs 33 and 32, and the cap 29
Since 9 is formed in a conical shape, the disk 8 is connected to the spring 3.
When pressed with the weight 17 against a spring force of 2.33, the center of the disc 8 and the rotating shaft 27 are reliably aligned, and the disc 8 is mounted on the turntable 28 without eccentricity. As described above, in the disc mounting device according to the present invention,
The disc 8 can be reliably mounted without requiring a drive source for driving the disc holder as in the conventional case.

Next, the operation of the disk loading device configured as described above will be explained. First, the state shown in FIGS. 1 and 2,
That is, in a state where the moving chassis 1 is outside the fixed chassis 13, when the disk 8 is placed on the turntable on the negative side of the spin motor 2 and the loading motor 9 is driven, the pinion 10 rotates counterclockwise. . At this time, the guide means 37 is prevented from being displaced in the direction of arrow 34 by the rack fixing pin 23 of the lock lever 20, so that the moving chassis 1, spin motor 2, moving rail 4, etc. are displaced in the direction of arrow 35. do. When the moving rail 4 moves in the direction of arrow 35 and reaches the fixed chassis 13, it cannot move any further, so the force acting on the rack 11 increases, and the lock lever 20 is moved against the spring force of the spring 25. The guide means 37 is displaced in the direction of arrow 34 while the rack fixing pin 23 is displaced along the slope 3B of the rack 11 to the position shown by the broken line. The displacement of this rack fixing pin 23,
That is, due to the angular displacement of the lock lever 20, the rail fixing pin 22 is also displaced and fits into the notch 36 of the moving rail 4 as shown by the broken line, thereby preventing the moving rail 4 from being displaced. . As the guide means 37 is displaced in the direction of arrow 34, the arm roller 18 rotates, thereby causing an angular displacement of the arm 15, as shown in FIG. 5(b).
The disk 8 is pressed by the weight 17 as shown in FIG. At this time, the disk 8 is attached to the conical cap 2.
While contacting the turntable 9, the turntable 28 is securely attached to the turntable 28 without being eccentric.

Next, when moving the moving chassis 1 out of the fixed chassis 13, the loading motor 9 is rotated clockwise. At this time, the rail fixing pin 22 of the moving rail 4 is fitted into the notch 36 as shown by the broken line in FIG. 3, and displacement is prevented. As a result, the guide means 37 moves in the direction of the arrow 35, thereby causing the arm 15 to undergo an angular displacement and the weight 17 to rise one step higher, resulting in the state shown in FIG. 5(a). As the guide means 37 moves in the direction of arrow 35, the rack fixing pin 23 rotates along the slope 38 of the rack 11, and returns to the position shown by the solid line in FIG. 3 by the spring force of the spring 25. , the rail fixing pin 22 also separates from the notch 36 of the moving rail 4 and returns to its original position. As a result, the moving rail 4 can be displaced and the fixed chassis 1
3 Move outside.

Although the above-mentioned embodiment has been described as being applied to a CD player, the present invention is not limited to a CD player, but can also be applied to a disc loading device such as a video disc.

<Effects> As described above, according to the present invention, a cylindrical turntable with a bottom is attached to the rotating shaft of the spin motor, and the rotating shaft is inserted into the turntable, and the end of the rotating shaft faces from the opening of the turntable. A conical cap with a rotating shaft insertion hole is attached to the rotating shaft by inserting the rotating shaft into the rotating shaft insertion hole, and the outermost circumferential surface of this cap is fixed. A cylindrical disc holder is inserted between the disc holder and the inner circumferential surface of the turntable, with the center axes of the disc holder and the rotating shaft aligned with each other, and the cap and the disc holder are connected to the inner bottom surface of the turntable. A means for biasing each disc individually in the axial direction of the rotary shaft is installed between the discs, and the disc mount is placed in a biasing position above the remote from the top of the turntable when no disc is installed.
The disc can be mounted on the turntable horizontally and without eccentricity, and unlike conventional technology, there is no need for a drive source to drive the disc mount, making it possible to downsize the disc mounting device and reduce costs. It becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a sectional view taken along the section line ■-■ in Fig. 1, and Fig. 3 is a lock lever.
4 is a side view of FIG. 3, and FIG. 5 is an enlarged sectional view of the vicinity of the spin motor 2. 2. Spin motor, 8. Disc, 27. Rotating shaft, 28. Turntable, 29. Cap, 30.
・Disk stand, 32.33...spring. Applicant: Sharp Co., Ltd. Agent: Patent Attorney Kazuhide Okada cr> -M JP-A-Sho GO-59564 (5)

Claims (1)

[Claims] (1) A cylindrical turntable with a bottom is attached to the rotating shaft of the spin motor, and their central axes are aligned so that the rotating shaft passes through the turntable and the end of the rotating shaft faces from the opening of the turntable. A conical cap with a rotary shaft insertion hole is attached to the rotary shaft by inserting the rotary shaft into the rotary shaft insertion hole, and between the outermost circumferential surface of the cap and the inner circumferential surface of the turntable. Place a cylindrical disk stand on the
Means for inserting the disc holder and the rotating shaft so that their center axes coincide with each other, and biasing each of them individually in the axial direction of the rotating shaft is provided between the cap and the disc holder and the inner bottom surface of the turntable. A disc mounting device characterized in that the disc mounting stand is in a biased position above the top of the turntable when the disc is not mounted.