JP2001176184A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a disk with large face wobbling from being brought into contact with a base without raising a stage error between the mounting face of a mounting part and the base as a whole in a disk reproducing device having the mounting part on which the disk is mounted and rotated and the base supporting the mounting part. SOLUTION: The disk reproducing device is provided with the mounting part in which the disk is placed on the mounting face and is rotated and a base member suppressing the mounting part. The mounting part is supported in a position which is deviated from a center in the insertion/discharge direction of the disk on the base member. The mounting part is inclined in such a way that the mounting face of the mounting part becomes lower than a side where a distance between the edge part of the base member and the mounting part in the insertion/discharge direction of the disk is shorter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk reproducing apparatus, and more particularly, to a disk reproducing apparatus for reproducing digital information recorded on a compact disk (CD), a video disk or the like.

[0002]

2. Description of the Related Art A conventional disk reproducing apparatus will be described with reference to the drawings.

FIG. 5 is a structural view showing the structure of a conventional disk reproducing apparatus. FIG. 5A shows a state in which a disk is not set in the disk reproducing apparatus (hereinafter, a disk standby state).
(B) shows a state in which the disk is set in the disk reproducing apparatus (hereinafter, a disk holding state).

[0004] The disc reproducing device 90 is a device for reproducing digital information such as music and video recorded as pits on the back surface of the disc 10 such as a compact disc (CD). A base 92 is installed in the inside, and a mounting portion 13 for mounting the disk 10 and performing a rotating operation is provided on the base 92. The mounting part 13 is a motor rotating shaft 1 of a motor 16.
The motor 16 is attached to the base 92 so that the rotation center line 161 a of the motor rotation shaft 161 is orthogonal to the base upper surface 921. The mounting section 13 rotates with the rotation of the motor 16. Support portions 128 are formed at the right and left ends of the rear portion of the base 92 as viewed from the disk insertion / ejection direction. The support shaft 129 of the support portion 128 rotatably supports the clamp arm 11. Clamp holding plate 1 is attached to clamp arm 11
11, the clamp 14 is loosely clamped by the clamp arm 11 and the clamp clamping plate 111, and is rotatably disposed. Also, the support portion 12 of the base 92
8 and near the rear side of the clamp arm 11, hook portions 124 and 112 are formed, respectively. The coil spring 15 is hooked on these hook portions 124 and 112,
The clamp arm 11 is urged downward. Case 21
A disk feeding means 19 for taking in and out the disk 10 is provided in front of the inside, and the disk feeding means 19 is composed of a roller 191 and a guide plate 192 and the like. Is adapted to transmit the rotation of a motor (not shown) via transmission means. The roller 191 moves up and down when the disk 10 is loaded and unloaded. In a standby state (FIG. 5A), the clamp arm 11 is lifted upward by driving a cam mechanism (not shown).

[0005] The disk reproducing apparatus 9 configured as described above.
5A, when the disk 10 is inserted into the housing 21 through the disk insertion / ejection port 211, the disk 10 is detected by first detecting means (not shown), and the first A motor (not shown) is driven by a signal from the detecting means, and the roller 191 rotates, and the disk 10 is fed into the housing 21. When the disc 10 is fed to a predetermined position, the tip of the disc 10
And the lower portion including the roller 191 of the disk feeding means 19 is lowered by a signal from the second detecting means, and the disk 10 is mounted on the mounting portion 13 and the cam The mechanism that lifts the clamp arm 11 upward by the mechanism is moved, and the force of the coil spring 15 is applied to rotate the clamp arm 11 downward. As shown in FIG. Is held and fixed on the mounting portion 13.

When information recorded on the disk 10 is reproduced, the disk 10 is rotated, and an optical pickup (not shown) is provided on a lower surface of the disk 10 with pits (not shown).
The information recorded as is read and reproduced. Receiver 1
When the disc 10 held by the disc 3 is ejected from the housing 21, the clamp arm 11 is driven upward by the cam mechanism, and the rollers 191 of the disc feed means 19 are driven.
Is raised, the disk 10 is sandwiched between the roller 191 and the guide plate 192, and then the roller 191 rotates to eject the disk 10 out of the housing 21.

[0007]

However, in the above-described disc reproducing apparatus, when the loaded disc 10 is oscillating, the disc 10 may come into contact with the base upper surface 921 or the like. Therefore, if the mounting surface 131 of the mounting portion 13 is made to protrude from the base upper surface 921 with a step of a predetermined height, the contact of the disk 10 can be avoided. Since it is necessary to increase the height, there has been a problem that the height of the disk reproducing apparatus is increased as a whole, and it goes against the reduction in thickness. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a disk reproducing apparatus that does not contact a base even with a disk 10 having a large surface runout without increasing a step between the mounting surface 131 and a base upper surface 921. The purpose is.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a mounting portion for mounting a disk on a mounting surface and rotating the disk and a base member for supporting the mounting portion. Wherein the mounting portion is supported at a position deviated from the center of the base member in the disk insertion / ejection direction, wherein the mounting portion includes the base member in the disk insertion / ejection direction. It is characterized in that the mounting portion is inclined such that the mounting surface of the mounting portion is lower with respect to the side where the distance between the edge portion and the mounting portion is shorter.

Further, the optical axis of the optical pickup is inclined parallel to the inclination of the mounting portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk reproducing apparatus according to a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a structural view showing the structure of a disk reproducing apparatus, wherein FIG. 1A is a plan view, FIG.
(C) is an enlarged view of a motor mounting portion, and (d) is a BB cross-sectional view.

The disk reproducing device 20 is a device for reproducing digital information such as music and video recorded as pits on the back surface of the disk 10 such as a compact disk (CD). A base 12 is installed therein, and a mounting section 13 on which the disk 10 is mounted to perform a rotating operation and an optical pickup 30 are disposed on the base 12. The rotating shaft of the mounting portion 13 is connected to a motor rotating shaft 161, and the motor 16 is mounted on the motor mounting seats 125 and 126 of the base 12 with screws. The motor mounting seat 125 has a seat height higher than the motor mounting seat 126 by the height h1, and the rotation center line 161a of the combined body of the motor 16 and the mounting portion 13 has a disc insertion / ejection hole with respect to a line perpendicular to the base upper surface 121. 21
1 (toward the leading edge 123) at an inclination angle θ.
The mounting portion 13 is installed so that the mounting portion 13 rotates about the motor rotation shaft 161 as the motor 16 rotates.
The optical pickup 30 includes a guide rail 32 and a transfer screw 31.
Thus, the optical axis 30a for irradiation toward the disk 10 is held so as to be perpendicular to the disk 10. That is, the position of the transfer screw 31 is set higher than the position of the guide rail 32 by the height h2 so that the optical axis 30a is inclined at the same angle θ as the inclination of the rotation center line 161a of the motor 16.

Support portions 128 are formed at both left and right ends of the rear portion of the base 12, and the clamp arm 11 is rotatably supported on a support shaft 129 of the support portion 128. A clamp holding plate 111 is fastened to the clamp arm 11 by a tack, and the clamp 14 is loosely held between the clamp arm 11 and the clamp holding plate 111 and is rotatably disposed. Also, hook portions 124 and 112 are provided in the vicinity of the support portion 128 of the base 12 and on the rear portion of the clamp arm 11.
Are formed respectively, and these hook portions 124, 11
2, the coil spring 15 is hooked, and the clamp arm 1
1 is biased downward. In the front of the inside of the housing 21, there is provided a disk feeding means 19 for loading and unloading the disk 10, and this disk feeding means 19
The rotation of a motor (not shown) is transmitted to a roller 191 disposed on the lower side through a transmission means. Also,
The roller 191 moves up and down when the disk 10 is loaded and unloaded. During standby, the clamp arm 11 is lifted upward by driving a cam mechanism (not shown).

The disk reproducing apparatus 2 configured as described above
0, when the disk 10 is inserted into the housing 21 from the disk insertion / ejection opening 211, the disk 10 is detected by a first detection unit (not shown), and the motor is driven by a signal from the first detection unit. Then, the roller 191 rotates and the disk 10 is fed into the housing 21. When the disk 10 is sent to a predetermined position, the disk 1
0 touches the second detecting means (not shown),
The lower part including the roller 191 of the disk feeding means 19 is lowered by the signal from the detecting means, the disk 10 is mounted on the mounting portion 13, and the member which has lifted the clamp arm 11 upward by the cam mechanism moves. Then, the force of the coil spring 15 acts on the clamp arm 11.
Is rotated downward, and the disk 10 is securely held and fixed on the mounting portion 13 as shown in FIG.

When reproducing the information recorded on the disk 10, the disk 10 is rotated, and the optical pickup 30 reads and reproduces information recorded as pits (not shown) on the lower surface of the disk 10. When ejecting the disk 10 held by the mounting portion 13 from the housing 21,
The clamp mechanism 11 is driven upward by the cam mechanism, and the lower portion of the disk feeding means 19 including the roller 191 is raised, so that the disk 10 is fixed to the roller 191 and the guide plate 1.
The roller 191 rotates after being pinched by the
0 is discharged out of the housing 21.

Next, the dimensional relationship of the gap between the disk 10 and the base upper surface 121 will be described with reference to the drawings. FIG. 2 is an explanatory diagram of a gap between the disk and the base. In the disc reproducing apparatus 20, the disc insertion / ejection means 19 is arranged on the disc insertion / ejection opening 211 side, so that the mounting portion 13 is unevenly distributed on the disc insertion / ejection opening 211 side from the center of the base 12 when viewed from the disc insertion / ejection direction. are doing. That is, the horizontal distance K from the front edge 123 of the base 12 on the side of the disk insertion / ejection port 211 to the rotation center line 161a of the mounting portion 13 on the base upper surface 121 is smaller than the mounting distance 13 from the rear edge 122 of the base 12. The horizontal distance L to the rotation center line 161a is longer.

On the other hand, the runout of the disk 10 (periodic fluctuation in the axial direction of the lower surface of the disk) increases from the center of the disk toward the outer periphery. That is, the influence of the runout of the disk 10 increases toward the rear edge 122. Therefore, FIG.
As shown in the figure, the portion above the rotation center line 161a of the mounting portion 13 and the motor 16 connected thereto has a shorter horizontal distance, that is,
It is arranged so as to be inclined at an angle θ on the side of the insertion / ejection port 211 (the end edge 123 side). Also, the base tip edge 12
E is the gap in the direction perpendicular to the disk surface between the disk 3 and the lower surface of the disk 10, J is the step from the mounting surface 131 to the intersection 121a between the base upper surface 121 and the rotation center line 161a, and the base rear edge 122 and the disk 10 Assuming that a gap in a direction perpendicular to the disk surface with respect to the lower surface of F is F, the gap F is expressed by the formula (1), and the step J is expressed by the formula (2).

F = E + (K + L) · sin θ (1) J = E + K · sin θ (2) F = J + L · sin θ · (3) Accordingly, the gap F is set higher than the step J by L · sin θ (Equation (3)). That is, the gap F can be made higher than before in consideration of the surface vibration of the disk 10, the step J can be made the conventional height, and the gap E can be made lower than before.
That is, the horizontal distance L is longer than the horizontal distance K and the rear edge 122
Is closer to the outer periphery of the disk, the gap F is kept larger than before, and the leading edge 123 is attached to the trailing edge 12.
Since the distance E is farther from the outer periphery than the disk 2, even if the gap E is shortened, there is no influence of surface vibration. In the disc reproducing apparatus 20 according to the present embodiment, the disc feeding means 19 is provided on the disc insertion / ejection opening 211 side (the leading edge 123 side), and there is an empty space. Since there is also an empty space on the upper surface of the disk 10, the insertion / ejection port 211 side (the leading edge 123 side) of the disk 10 can be lowered to raise the rear edge 122 side of the disk 10. That is, the gap F is larger than in the past, but uses the empty space, and it is not necessary to make the entire disc reproducing apparatus 20 higher.

Note that the motor rotation shaft 16 is
As a method for inclining the motor 1, the structure in which the seat heights of the motor mounting seats 125 and 126 are different is shown. However, as shown in the second embodiment of FIG. The above-described effect can be obtained even if an inclined surface is formed on a horizontal plane (a plane parallel to the housing 21) up to substantially the center, and the tip edge 123 side is lowered from the horizontal plane to the base tip edge 123. If the base 12 itself is tilted in this manner, the optical pickup 30 can be tilted in the same manner, so that it is not necessary to adjust the angles of the motor 16 and the optical pickup 30.

As shown in FIG. 4, the mounting surface 131 of the mounting portion 13 is placed on the side of the disk insertion / ejection port 211 (the leading edge portion 123).
When the disc 10 is ejected, the disc 10 is less likely to be caught on the shoulder 132 of the mounting portion 13 when the disc 10 is ejected.

In the above, the case where the mounting portion 13 is unevenly distributed on the side closer to the front edge portion 123 has been described, but when the mounting portion 13 is unevenly distributed on the rear edge portion 122 side, the rotation of the motor 16 is performed. The upper part of the center line 161a is inclined toward the rear edge 122, that is,
The upper part of the rotation center line 161a is inclined toward the side away from the disc insertion / ejection opening to increase the gap E and decrease the gap F,
At the same time, the optical axis 30a of the optical pickup 30 should be parallel to the rotation center line 161a of the motor 16.

[0022]

As described above, according to the present invention, it is possible to secure a necessary gap between the base and the disk while keeping the entire height of the disk reproducing apparatus as conventional.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a structure of a disk reproducing apparatus according to a first embodiment of the present invention, where (a) is a plan view,
(B) is an AA sectional view, (c) is an enlarged view of a motor mounting portion, and (d) is a BB sectional view.

FIG. 2 is an explanatory diagram of a gap between a disk and a base.

FIG. 3 is a structural diagram showing a structure of a disk reproducing device according to a second embodiment of the present invention.

FIG. 4 is a state diagram showing a state when a disc is ejected.

FIG. 5 is a structural diagram showing the structure of a conventional disk reproducing device.

[Explanation of symbols]

 10 Disk 12 92 Base 13 Mounting part Motor 21 Housing 30 Optical pickup 131 Mounting surface 161 ··· Motor rotation shaft 211 ··· Disk insertion / ejection slot

Claims (2)

[Claims] 1. A mounting portion for mounting a disk on a mounting surface and rotating the mounting portion, and a base member for supporting the mounting portion, wherein the mounting portion is a direction in which the base member inserts and discharges the disk. In the disc reproducing apparatus supported at a position more eccentric than the center in the above, the mounting portion is located on a side where the distance between the edge portion of the base member and the mounting portion in the insertion and ejection direction of the disk is shorter. A disk reproducing apparatus characterized in that the mounting surface of the mounting portion is inclined so as to be lower. 2. The disk reproducing apparatus according to claim 1, wherein the optical axis of the optical pickup is inclined in parallel with the inclination of the mounting section.