JPH0573737U - Optical disk device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an optical disc device which realizes reliability as a device while simplifying the clamp operation in the optical disc device to realize a thin and compact device as a whole. [Structure] The disk D is clamped by pushing the ball 5 in the cone 6 by the attractive force of the magnet 10 and the piece 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical disc device, particularly a disc clamp device, for reproducing information on a recording medium or for recording / reproducing or recording / reproducing / erasing information on a recording medium.

[0002]

[Prior Art]

 A conventional optical disk device is shown in FIG. 7, a spindle motor 103 is attached to a chassis 102 arranged inside a housing 101 of the optical disk device. A turntable 104 for loading a disk D is attached to the tip of the rotating shaft of the motor 103, and a clamp member 107 attached to an upper casing 108 is arranged on the upper surface of the turntable 104. An optical head 105 is moved by a moving unit (not shown).

In operation, the disc D is loaded on the turntable 104, and the clamp material 107 descends from above the loaded disc D as the housing upper surface 108 moves. Then, the chucking operation of the clamp member 107 causes the disk D to be chucked in the optical disk device.

However, in such a conventional optical disk device, the clamp member 107 pushes the disk D from above, and as a result, a load is applied to the spindle motor 103 via its rotating shaft.

In addition, in such a device, a separate member for chucking (a clamp member 107 in the past) is required, which increases the number of parts, and a separate member is required on the upper surface of the disk D. The thickness of the device was increased by the number of components, and it was difficult to realize a compact and thin device.

Further, as described above, since the disk is chucked while being connected to the upper surface 108 of the housing, vibration applied to the device is directly applied to the disk D, and the optical disk needs to rotate with high accuracy. In the equipment, the reliability of the product caused a big problem.

As means for solving these problems, there is JP-A-3-157859. An outline of this is shown in FIG. The chuck member 100 is arranged at the tip of the spindle motor 103. In this chuck member 100, an O-ring 120 made of an elastic material is arranged inside a cone 110, and a clamp ball 130 is projected from an opening 140 of the cone 110. About three spheres 103 are arranged at equal intervals around the cone 110, the upper surface thereof is pressed by the upper surface 111 of the cone 110, and the lower surface thereof is pressed by the stopper 160. The sphere 130 does not normally come out of the opening 140 of the cone 110 because more than a hemisphere is inside the cone 110.

Next, as a chucking operation, the cone 110 of the chucking device 100 is inserted into the inner hole 150 of the disk D, and at this time, the clamp ball 130 is prevented from being pressed by the O-ring 120 by the inner peripheral surface of the inner hole 150. When the disc D is loaded on the turntable 104 by pushing it into the cone 110, the clamp ball 130 projects from the opening 140 by the reaction force of the O-ring 120, and clamps the disc D together with the turntable 104.

As a result, the device is made thinner and the load on the motor 103 is eliminated.

However, in this device, chucking is performed using the elastic force of the O-ring 120, and thus chucking displacement due to a decrease in this elastic force cannot be avoided. In other words, in the portion of the O-ring 120 where the ball 130 hits, the stress from the ball 130 is always applied, so that the elastic force sharply decreases with time and the chucking by the ball 130 cannot be maintained.

[0011]

[Problems to be solved by the device]

 With the above-mentioned conventional technique, an optical disk device that realizes thinness and light weight can be configured, but since an elastic body such as the O-ring 120 is used and a force is constantly applied to this elastic body, the elastic force rapidly decreases. Inevitably, there is a problem in the reliability of the device, especially in an optical disk device that is intended for carrying.

In view of this, the present application provides an optical disc device that realizes a smaller and thinner device and has improved reliability as a device.

[0013]

[Means for Solving the Problems]

 In order to solve the above problems, according to the present invention, a disc provided with a central hole is placed, and a turntable which is rotationally operated by a rotation driving means, and a central table of the turntable which is arranged in the central portion of the turntable are provided. An insertion part to be inserted into the insertion part, a plurality of spherical members arranged in the insertion part so as to be able to move forward and backward, and a magnetic attraction member for urging the spherical member in a direction projecting outward of the insertion part. Provided is an optical disk device, wherein a spherical member slightly protruding from the periphery of the insertion portion presses and fixes the disk mounted on the turntable toward the turntable by the biasing of the member.

As a second, third, and fourth invention, a circular wall-shaped fitting surface that fits the insertion portion into the center hole of the disk, and the spherical member formed on the fitting surface slightly protrudes. The magnetic attraction member has a magnet and a piece that is attracted by the magnet and that is partially made of a magnetic material and has an inclined portion that is inclined with respect to the attraction direction from the magnet. The piece is moved by the attraction by a magnet, and the moving force of the piece moves the spherical member in contact with the inclined portion toward the outside of the insertion portion, and the magnetic attraction member is inserted through the insertion portion. A first magnet having a first pole arranged outward in the center position of the part, and a first magnet arranged around the first magnet, and the same pole as the first pole is arranged in the first magnet direction. , On the other side is the front The second magnet is in contact with the spherical member.

In still another aspect of the invention, there is provided an optical disk device, wherein the insertion portion receives the biasing force when the spherical member is biased by the magnetic attraction member.

[0016]

【Example】

 An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. FIG. 1 is a partial cross-sectional view of the optical disc device of the present invention.

In FIG. 1, the chucking member 1 is arranged at the tip of the spindle motor shaft 3 attached to the chassis 102. A cone 6 having a partial opening 14 is attached to the upper surface of the turntable 4. This attachment is performed by hooking the first key portion 14 formed inside the turntable 4 and the second key portion 16 formed on the cone 6.

A clamping ball 5 for chucking is arranged inside the cone 6, and the part of the ball 5 inside the cone 6 is pushed by a piece 11. The piece 11 is made of a magnetic material such as iron, and is attracted downward by the magnet 10 arranged inside the turntable 4. This suction force serves as a force to push the clamp ball 5.

FIG. 2 shows the state in detail. That is, when the piece 11 is attracted by the magnet 10, the resultant force (vector sum) f of the force F1 from the piece 11 and the reaction force F2 from the upper portion of the first key portion 14 is applied to the sphere 5 from the cone 6. It is generated as a sudden output of.

FIG. 3 is a top view and FIG. 4 is a side view. In this way, a part of the sphere 5 slightly projects from the cone 6. Three spheres 5 are arranged around the cone 6 at equal intervals.

Next, as the chucking operation, the cone 6 of the chucking device 1 is inserted into the inner hole 15 of the disk D, and at this time, the inner peripheral surface of the inner hole 15 causes the clamp ball 5 to resist the resultant force f 1. When the disc D is pushed into the turntable 6 and loaded on the turntable 4, the clamp ball 5 projects from the opening 14 by the resultant force f as shown in FIG. 4, and clamps the disc D together with the turntable 4.

As a second embodiment, a partial sectional view is shown in FIG. The same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the magnet 10 'is arranged not in the turntable 4 but in the cone 6, and the shape of the piece 11' is formed so as to have a recessed portion into which the magnet 10 'can enter.

This makes the turntable 4 thin, which is effective when the turntable 4 cannot be made large.

A third embodiment is shown in FIG. This is a sectional view of an essential part, and is formed so that the ball 5 is pushed by the pair of magnets 10a and 10b. At this time, the cone 6'is formed of a non-magnetic material.

By adopting this embodiment, a thinner device can be realized.

[0026]

[Effect of the device]

 As described above, according to the present invention, it is possible to realize a thin device and to realize a highly reliable device by using a magnet or a piece.

[Submission date] March 27, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical disc device, particularly a disc clamp device, for reproducing information on a recording medium or for recording / reproducing or recording / reproducing / erasing information on a recording medium.

[0002]

[Prior Art]

 A conventional optical disk device is shown in FIG. 8, a spindle motor 103 is attached to a chassis 102 arranged inside a housing 101 of the optical disk device. A turntable 104 for loading a disk D is attached to the tip of the rotating shaft of the motor 103, and a clamp member 107 attached to an upper casing 108 is arranged on the upper surface of the turntable 104. An optical head 105 is moved by a moving unit (not shown). In operation, the disc D is loaded on the turntable 104, and the clamp member 107 comes down from above the loaded disc D as the housing upper surface 108 moves. Then, the disc D is clamped in the optical disc device by the clamping operation of the clamp member 107.

However, in such a conventional optical disk device, the clamp member 107 pushes the disk D from above, and as a result, a load is applied to the spindle motor 103 via its rotating shaft.

Further, in such a device, a separate member for clamping (conventionally, a clamp member 107) is required, which increases the number of parts and a separate member is required on the upper surface of the disk D. Therefore, it is difficult to realize a compact and thin device because the device needs to be thicker.

Further, as described above, since the optical disc device is clamped in a state of being connected to the upper surface 108 of the housing, vibrations applied to the device are directly applied to the disc D, so that in an optical disc device that needs to rotate with high precision. However, it caused a big problem in the reliability of the product.

As means for solving these problems, there is JP-A-3-157859. The outline of this is shown in FIG. The chuck member 100 is arranged at the tip of the spindle motor 103. In this chuck member 100, an O-ring 120 made of an elastic material is arranged inside a cone 110, and a clamp ball 130 is projected from an opening 140 of the cone 110. About three spheres 103 are arranged at equal intervals around the cone 110, the upper surface thereof is pressed by the upper surface 111 of the cone 110, and the lower surface thereof is pressed by the stopper 160. The sphere 130 does not normally come out of the opening 140 of the cone 110 because more than a hemisphere is inside the cone 110.

Next, as the clamping operation, the cone 110 of the clamp device 100 is inserted into the inner hole 150 of the disk D, and at this time, the inner peripheral surface of the inner hole 150 causes the clamp ball 130 to resist the pressing of the O-ring 120. When the disc D is loaded on the turntable 104 by pushing it into the cone 110, the clamp ball 130 projects from the opening 140 by the reaction force of the O-ring 120, and clamps the disc D together with the turntable 104.

As a result, the device is made thinner and the load on the motor 103 is eliminated. However, in this device, the elastic force of the O-ring 120 is used for clamping, and thus the clamp displacement due to the decrease in the elastic force cannot be avoided. In other words, the portion of the O-ring 120 where the ball 130 abuts is always subjected to stress from the ball 130, so that the elastic force sharply decreases with time, and it becomes impossible to maintain the clamp by the ball 130.

[0009]

[Problems to be solved by the device]

 With the above-mentioned conventional technique, an optical disk device that realizes thinness and light weight can be configured, but since an elastic body such as the O-ring 120 is used and a force is constantly applied to this elastic body, the elastic force rapidly decreases. Inevitably, there is a problem in the reliability of the device, especially in an optical disk device that is intended for carrying.

In view of the above, the present application provides an optical disc device that realizes a compact and thin device and has improved reliability as a device.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, according to the present invention, a disc provided with a central hole is placed, and a turntable which is rotationally operated by a rotation driving means, and a central table of the turntable which is arranged in the central portion of the turntable are provided. An insertion part to be inserted into the insertion part, a plurality of spherical members arranged in the insertion part so as to be able to move forward and backward, and a magnetic attraction member for urging the spherical member in a direction projecting outward of the insertion part. Provided is an optical disk device, wherein a spherical member slightly protruding from the periphery of the insertion portion presses and fixes the disk mounted on the turntable toward the turntable by the biasing of the member.

As a second, third, and fourth invention, a circular wall-shaped fitting surface that fits the insertion portion into the center hole of the disk, and the spherical member formed on the fitting surface slightly protrudes. The magnetic attraction member has a magnet and a piece that is attracted by the magnet and that is partially made of a magnetic material and has an inclined portion that is inclined with respect to the attraction direction from the magnet. The piece is moved by the attraction by a magnet, and the moving force of the piece moves the spherical member in contact with the inclined portion toward the outside of the insertion portion, and the magnetic attraction member is inserted through the insertion portion. A first magnet having a first pole arranged outward in the center position of the part, and a first magnet arranged around the first magnet, and the same pole as the first pole is arranged in the first magnet direction. , On the other side is the front The second magnet is in contact with the spherical member. In still another aspect of the invention, there is provided an optical disk device, wherein the insertion portion receives the biasing force when the spherical member is biased by the magnetic attraction member.

[0013]

【Example】

 An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. FIG. 1 is a partial cross-sectional view of the optical disc device of the present invention.

In FIG. 1, the clamp member 1 is arranged at the tip of the spindle motor shaft 3 attached to the chassis 102. A cone 6 having a partial opening 14 is attached to the upper surface of the turntable 4. This attachment is performed by hooking the first key portion 14 formed inside the turntable 4 and the second key portion 16 formed on the cone 6.

A clamp ball 5 for clamping is arranged inside the cone 6, and a portion of the ball 5 inside the cone 6 is pushed by a piece 11. The piece 11 is made of a magnetic material such as iron, and is attracted downward by a magnet 10 arranged inside the turntable 4. This suction force serves as a force to push the clamp ball 5.

FIG. 2 shows the state in detail. That is, when the piece 11 is attracted by the magnet 10, the resultant force (vector sum) f of the force F1 from the piece 11 and the reaction force F2 from the upper portion of the first key portion 14 is applied to the sphere 5 from the cone 6. It is generated as a sudden output of.

FIG. 3 shows a top view and a side view of FIG. 4. In this way, a part of the sphere 5 slightly projects from the cone 6. Three spheres 5 are arranged around the cone 6 at equal intervals.

Next, as a clamping operation, the cone 6 of the clamp device 1 is inserted into the inner hole 15 of the disk D, and at this time, the inner peripheral surface of the inner hole 15 causes the clamp ball 5 to resist the resultant force f and thus the inside of the cone 6. When the disc D is loaded onto the turntable 4 and is loaded onto the turntable 4, the clamp ball 5 projects from the opening 14 by the resultant force f as shown in FIG. 4, and clamps the disc D together with the turntable 4.

As a second embodiment, FIG. 5 shows a partial sectional view. The same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the magnet 10 'is arranged not in the turntable 4 but in the cone 6, and the shape of the piece 11' is formed so as to have a recessed portion into which the magnet 10 'can enter. This makes the turntable 4 thin, which is effective when the turntable 4 cannot be made large.

A third embodiment is shown in FIG. This is a sectional view of an essential part, and is formed so that the ball 5 is pushed by the pair of magnets 10a and 10b. At this time, the cone 6'is formed of a non-magnetic material.

By adopting this embodiment, the device can be made thinner. As a fourth embodiment, as shown in FIG. 7, a turntable 40 formed of an iron-based material, a holding magnet 20 for holding the ball 5, and a holding magnet 20 are attached at the bottom of the drawing. Another embodiment such as the first embodiment is provided with an urging magnet 30 for urging, and by the repulsion of the holding magnet 20 and the urging magnet 30 and the attraction force of the holding magnet 20 and the turntable 40 at the same time. It is possible to push the ball 5 with more force than in the example device. Therefore, the clamping force is increased, and it is possible to suppress variations in the clamping force due to variations in the plurality of balls 5 and variations in the disc D, and thus eccentric movement of the disc D. Further, since the clamping force is large, accurate clamping can be continued even when the clamping force is required, for example, when the disc D rotates from the stopped state to the high speed rotation, and the rotation is stabilized.

[0022]

[Effect of the device]

 As described above, according to the present invention, it is possible to realize a thin device and to realize a highly reliable device by using a magnet or a piece.

[Brief description of drawings]

FIG. 1 is a side view of a partial cross section of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment shown in FIG.

FIG. 3 is a top view of the embodiment of FIG.

4 is a side view of the embodiment of FIG.

FIG. 5 is a partial cross-sectional side view of the second embodiment of the present invention.

FIG. 6 is a cross-sectional view of an essential part of a third embodiment of the present invention.

FIG. 7 is a side view of the related art.

FIG. 8 is a side view of the related art.

[Explanation of symbols]

 1 chucking member 4 turntable 5 spherical member (clamp ball) 6 insertion part (cone) 10 magnetic attraction member (magnet) 11 magnetic attraction member (piece) 15 center hole (inner hole)

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[Procedure amendment]

[Submission date] March 27, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of device] Optical disk device

[Scope of utility model registration request]

[Brief description of drawings]

FIG. 1 is a side view of a partial cross section of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment shown in FIG.

FIG. 3 is a top view of the embodiment of FIG.

4 is a side view of the embodiment of FIG.

FIG. 5 is a partial cross-sectional side view of the second embodiment of the present invention.

FIG. 6 is a cross-sectional view of an essential part of a third embodiment of the present invention.

FIG. 7 is a cross-sectional view of essential parts of a fourth embodiment of the present invention.

FIG. 8 is a side view of the related art.

FIG. 9 is a side view of the related art.

[Explanation of reference numerals] 1 clamp member 4 turntable 5 spherical member (clamp ball) 6 insertion part (cone) 10 magnetic attraction member (magnet) 11 magnetic attraction member (piece) 15 center hole (inner hole)

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 6]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 7]

[Figure 8]

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Added

[Correction content]

[Figure 9]

Claims (5)

[Scope of utility model registration request] 1. A turntable on which a disc having a center hole is placed and which is rotationally operated by a rotation driving means, and an insertion portion which is arranged at the center of the turntable and is inserted into the center hole of the disc. A plurality of spherical members that can be moved forward and backward in the insertion portion and a magnetic attraction member that urges the spherical members in a direction projecting outward of the insertion portion are provided. An optical disk device, wherein a spherical member slightly protruding from the periphery of the insertion portion presses and fixes the disk placed on the turntable to the turntable side by force. 2. The insertion portion includes a circular wall surface that is inserted into the center hole of the disk, and an opening formed in the wall surface so as to project a part of the spherical member. The optical disk device according to claim 1. 3. The magnetic attraction member includes a magnet, and a piece that is attracted by the magnet and that is made of a magnetic material and has an inclined portion that is inclined with respect to the attraction direction from the magnet. 3. The optical disk device according to claim 1, wherein the piece is moved by suction, and the moving force urges the spherical member that is in contact with the inclined portion toward the outside of the insertion portion. 4. The magnetic attraction member includes a first magnet having a first pole arranged outward at a center position of the insertion portion, and a first magnet arranged around the first magnet. 3. The optical disk device according to claim 1, wherein the same pole as the first pole is arranged in the same direction, and a second magnet with which the spherical member is in contact is provided on the opposite side thereof. 5. The insertion portion receives the biasing force when the spherical member is biased by the magnetic attraction member.
5. The optical disk device described in 4 above.