JP2003091905A - Disk chuck mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk chuck mechanism which is suitable for checking a disk with small diameter, thin and rotated at high speed, in which distortion is hardly caused on a disk surface and smooth chuck and unchuck operations are possible. SOLUTION: The disk chuck mechanism is constituted of a plurality of independent pieces the ring members of which are divided and arranged like a ring and is provided with an elastic ring to be engaged with the respective pieces and to energize the diameter of the ring in the reducing direction and a guide member that guides a plurality of fins to be radiated in the radius direction of a ring by which the respective pieces are advanced to and retracted from a central opening in accordance with expansion and reduction of the diameter of the ring to be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk chucking mechanism, and more particularly to a disk driving mechanism for a magnetic disk, optical disk, or other inspection device for chucking a disk having a small diameter and a small thickness and rotating at a high speed. Suitable for
In addition, the present invention relates to a disc chuck mechanism in which distortion is unlikely to occur on the disc surface and which enables smooth chucking and unchucking operations.

[0002]

2. Description of the Related Art A magnetic disk, an optical disk, or the like used for information storage is inspected by a disk inspection device for physical defects of a storage medium and whether or not its electric storage performance is good. This type of inspection apparatus is provided with a spindle and a rotating mechanism thereof, and a disk to be inspected is chucked and rotated by a chuck mechanism provided on the head of the spindle. The disk is automatically attached to the head of the spindle by the robot hand, but the diameter of the disk is currently reduced from 1.8 inches to 1 inch for magnetic disks and 3.5 inches for optical disks. And has been miniaturized. Moreover, the rotational speed of these disks tends to be further increased, and a small-sized disk chuck mechanism adapted to this has been developed and used.

FIG. 5 shows a disk chuck mechanism using a C-shaped radial chuck ring suitable for chucking a disk having a small diameter and a small thickness, which is disclosed by the applicant in Japanese Patent Laid-Open No. 11-273206. It was filed as a "chuck mechanism". In FIG. 5, the left side of the central portion is a cross-sectional view showing the internal structure thereof. In FIG. 5, the disc chuck mechanism 10 is
A head disk 11, a connecting rod 12, an elastic chuck ring 13 (a so-called C-ring, see FIG. 6) in which a circular part is cut, a cylinder 14, a coil spring 16,
It is composed of a pressing disk 17, a diaphragm 18, and a contact ring 19. The disk 1 indicated by the alternate long and short dash line is received by the tip of the disk 1, and the inner diameter side surface of the disk 1 is chucked by the chuck ring 13.
The disk 1 is chucked by being pressed by the outer surface of the disk.

The cylinder 14 has a hollow inside, a cylinder body 14a, flange portions 14b and 14c which sequentially project from the inner wall of the cylinder body 14a in two steps, and a flange portion 14b which is arranged in the front cavity of the cylinder body 14a. The cone boss 15a loaded together and the flange portion 14 which is similarly arranged in the cavity on the side opposite to the cone boss 15a
It is composed of a cylindrical block 15b which is engaged with c and is loaded in the cylinder body 14. The outer shape of the contact ring 19 matches the inner diameter of the rear end portion of the cylinder body 14a, and plays a role of holding the diaphragm 18 uniformly.
The cylinder 14 is also coupled to the spindle at the rear end. As a result, the disc chuck mechanism 10 is rotated at high speed.

Here, the cone boss 15a has an inclined surface 15 protruding in a conical shape. As shown in FIG. 7, the inclined surface 13a formed on the inner side surface of the tip portion 24 of the chuck ring 13 is inclined. Contact surface 15. Returning to FIG. 5, the connecting rod 12 is urged downward by the coil spring 16 in a compressed state mounted on the rear portion of the cylinder 14, and the head disc 11 is pushed by the pressing urging force of the coil spring 16. When the chuck ring 13 is pushed downward, the chuck ring 13 is pushed downward and goes down the inclined surface 15 to increase its diameter, and the inner diameter side surface 1b of the disc 1 (see FIG.
The outer peripheral side surface of the chuck ring 13 is pressed against the disk 1 and the disk 1 is chucked. The chuck release of the disc 1 is performed by pushing the connecting rod 12 upward. This push-up is because the diaphragm 18 is pushed up by supplying air, and the coupling rod 12 is pushed up via the diaphragm 18. Therefore, when chucking the disk 1, the air supply may be cut off.

As shown in FIGS. 6 and 7, the chuck ring 13 comprises a ring portion 20 made of synthetic resin such as nylon having an opening 21 in a part thereof and a spring 25. The ring portion 20 has vertical grooves 22 formed at three locations in the vertical direction on the circumferential surface thereof, and the portion is cut off, so that the thickness of this portion of the chuck ring 13 is reduced. Further, as shown in the partial cross section of FIG. 7, the chuck ring 13 has a lateral groove 23 formed along the circumferential direction on the inner side at a substantially central portion in the height direction, and the thickness of this portion is also thin. . As shown by the alternate long and short dash line in FIG. 7, with respect to the disc 1, the outer side surface of the tip portion 24 below the lateral groove 23 is a pressing surface that engages with the inner diameter side surface 1 b of the disc 1, An inclined surface 13a having an inclination corresponding to the inclined surface 15 of the cone boss 15a is formed inside the portion 24.
Furthermore, a spring storage groove 26 is also formed on the upper surface along the circumferential direction, and a C-shaped steel ring spring 25 is inserted and attached thereto.

The relationship among the chuck ring 13, the cone boss 15a, and the cylinder 14 will be described with reference to FIGS. 5 and 7. The cylinder body 14 has a stepped portion 140 in the peripheral portion of the surface on the tip side for receiving the disk 1. Has been.
The stepped portion 140 forms a circular groove 141 with the side surface of the cone boss 15a, which is substantially equal to or slightly larger than the inner diameter of the disc 1. Further, a flange portion 14b protruding inward from the inner wall is provided at the back of the step portion 140. Then, in the disc chuck state, the inner diameter side surface 1b of the disc 1 is pressed by the tip portion 24 in a state where the tip portion 24 of the chuck ring 13 is fitted in the circular groove 141.

[0008]

Now, in order to chuck the disk 1 with a C-shaped chuck ring having one open position as shown in FIG. 6, the diameter reduction during uncucking is 1-2 mm. Degree is necessary. As I explained earlier,
With the reduction of the outer diameter of the medium to be chucked, the inner diameter of the medium is becoming smaller and smaller. However, as the inner diameter becomes smaller, the bending stress at the time of contraction increases and the chuck ring creeps, which causes a problem that a normal chuck cannot be performed. Further, the contracting force of the spring ring (tightener) for contracting the chuck ring becomes large on the contrary, which causes a problem that the chucking and uncucking operations cannot be smoothly performed. In order to avoid such a problem, it is conceivable to divide the chuck ring into a plurality of chuck pieces, but the divided chuck pieces are misaligned and the spatial arrangement of the low chuck pieces becomes unbalanced. Moreover, since the contraction force of the spring ring is large, the pressing force applied to the inner peripheral side surface of the disk becomes uneven accordingly.
As a result, a disk chucked with a small diameter and a small thickness has a surface distortion, which adversely affects the test.
An object of the present invention is to solve such a problem, and is suitable for chucking a high-speed rotating disk having a small diameter and a small thickness, and the surface of the disk is less likely to be distorted and smooth. It is to provide a disc chuck mechanism capable of chucking and uncucking operations.

[0009]

The features of the disk chuck mechanism of the present invention for attaining the above object are that a ring member is engaged with an inclined surface provided inside the disk chuck mechanism so as to follow the inclined surface. A disk chuck mechanism that enlarges the diameter of the ring member to press the side surface of the central opening of the disk or its peripheral surface to chuck the disk, and reduces the diameter of the ring member along the inclined surface to release the disk. In which the ring member is divided into a plurality of independent pieces arranged in a ring shape, and is urged in a direction to reduce the diameter of the ring formed by each piece by engaging each piece. Elastic ring and a plurality of pieces that extend and retract with respect to the central opening as the diameter of the formed ring expands and contracts, and that extend radially in the radial direction of the formed ring. It is intended and a guide member for guiding the fins.

[0010]

As described above, according to the present invention, the ring member for the disc chuck is divided into a plurality of chuck pieces, and the space between the pieces or the chuck pieces is formed. By providing a guide member having fins (collars) that are inserted in the guide groove and arranged in the radial direction, the guide member guides the forward and backward movement of each piece that moves forward and backward with respect to the central opening of the disc. As a result, there is almost no displacement of each piece, and the disk is chucked by uniformly pressing the inner diameter side surface against the disk without increasing the contraction force of the elastic ring with respect to the disk having a small disk inner diameter. be able to. As a result, when the disc is chucked, the disc surface is less likely to be distorted, and it is suitable for chucking a thin disc with a small diameter and high speed rotation, and a disc chuck capable of smooth chucking and uncucking. The mechanism can be easily realized.

[0011]

1 is a partially enlarged sectional view of a disc chuck mechanism and an uncuck state of a disc chuck mechanism according to an embodiment of the present invention. FIG. 2 is a perspective view of a chuck piece and a guide member. 3 is a plan view of a disc chuck mechanism in which a head plate is removed so that an internal state can be seen, and FIG. 4 is an explanatory diagram of a relationship between a guide member and a radial chuck piece of the disc chuck mechanism of another embodiment. In addition, the same components as those in FIGS. 5 to 7 are denoted by the same reference numerals, and the description thereof will be omitted. In FIG. 1, the disc chuck mechanism 2 has a guide member 3 inserted between the head disk 11 and the cone boss 15a of FIG. Then, the chuck ring 13 to which the spring 25 of the C-shaped steel ring of FIGS.
Here, instead of this, four chuck pieces 4
The radial chuck 4 is composed of four pieces a, 4b, 4c, and 4d. In addition, FIG.
As shown in, C-shaped steel ring spring 25
Instead, an elastic ring 5 such as an O-ring made of synthetic rubber or the like is attached to the chuck pieces 4a, 4b, 4c, and 4d through insertion grooves 6 on the outer peripheral side surfaces thereof. The insertion groove 6 is provided in a substantially middle portion of the outer peripheral side surface of each chuck piece 4a, 4b, 4c, 4d.

The disc chuck mechanism 2 shown in FIG.
In the disk chuck mechanism 10 shown in FIG. 5, the front end side of the cylinder 14 is narrowed down in order to accommodate a disk having a smaller diameter. That is, as shown in FIG. 1 and FIG. 3, the body portion 143 having the outer diameter of the tip end thereof is narrowed with respect to the body portion 144 having the outer diameter corresponding to the cylinder body 14a of FIG. As a result, the diameter of the stepped portion 140 formed in the peripheral portion of the surface on the tip side for receiving the disk 1 and the diameter of the circular groove 141 are further reduced. As a result, the peripheral surface 142 that receives the inner peripheral surface of the disk 1 has a smaller diameter. Further, a large diameter flange portion 145 (see FIG. 3) is formed in the rear portion of the body portion 144 in order to be coupled to a spindle rotating at a higher speed.

Here, as shown in FIG. 2 (b), the guide member 3 has a plate-like shape which laterally projects in a cross shape outwardly at the center of the side surface of the four sides around the rectangular block 30. It has four fins 31, 32, 33, 34. The plate surfaces of these fins 31, 32, 33, 34 are vertical as shown in the drawing, and a loose fitting hole 35 through which the connecting rod 12 penetrates is formed in the central portion of the guide member 3. This guide member 3 is, as shown in FIG.
1 and the cone boss 15a are mounted on the radial chuck 4. At this time, the fins 31, 32, 33,
34 is the four divided chuck pieces 4a, 4b,
It is arranged in the space 40 between 4c and 4d. Note that FIG.
Is a sectional view of the state where the disc is chucked, and a right side is a sectional view of the state where the disc is opened. The circle indicated by the dotted line is the elastic ring 5, and
As shown in FIG. 2A, the elastic ring 5 is located below the guide member 3.

Each chuck piece 4a shown in FIG.
4b, 4c, and 4d have substantially the same form as the ones in which the vertical groove 22 at three places in FIG. 6 is not formed, but the groove portions are cut and eliminated. However, the lateral groove 23 of the chuck ring 13 is not formed in this, and the back surface thereof has a uniform inclined surface 13a. As a result, as shown in FIG. 3, each fin 31, 32, 3
A divided space 40 into which 3, 34 are inserted is created. As described above, the radial chuck 4 (ring member) is divided into the four chuck pieces 4a, 4b, 4c, and 4d, so that the compression force of the elastic ring 5 is evenly applied to each chuck piece, and The pieces are small and each chuck piece can be retracted without requiring too much contraction force due to the effect of the dividing space. On the other hand, when each chuck piece advances toward the inner diameter side surface 1b of the disk 1, a large force is uniformly exerted to press the inner diameter side surface 1b. As a result, a large contraction force is not required for the elastic ring 5. Further, a guide member 3 is provided, and the fins 31, 32, 33, 34 are attached to the chuck pieces 4a, 4b,
By arranging the chuck pieces 4a, 4b, 4c, 4d in the divided spaces 40 of 4c, 4d, the fins 31, 3,
It can be guided by 2, 33, 34. Accordingly, in the disc chuck state, the chuck pieces 4a, 4b, 4c, 4d have almost no displacement,
A uniform pressing force can be generated on the inner peripheral surface of the disc. Even if the disc rotates at high speed, the chucked state does not come off.

FIG. 4 is an explanatory view of the relationship between the guide member and the radial chuck piece of the disc chuck mechanism of another embodiment. The chuck pieces 4a, 4b, 4c of FIG.
4d, as shown as a chuck piece 41, a guide groove 42 having a depth that serves as a bottom surface above the elastic ring 5 is provided in the central portion of the outer periphery, and the guide member 43 is
The base portion is a disc 44, and the fins 45, which are evenly arranged at 90 ° intervals, are loosely fitted in the guide grooves 42. Other configurations are the same as those in FIG. In FIG. 4, 46 is a loose fitting hole through which the connecting rod 12 penetrates, and 47 is an insertion groove into which the elastic ring 5 is inserted.
Therefore, in this embodiment, the chuck pieces 4a, 4b,
Instead of 4c and 4d, four chuck pieces 41 are provided on the lower side of the guide member 43, and each fin 45 is loosely fitted in the guide groove 42 of each chuck piece 41. Be guided.

As described above, in the embodiment, the radial chuck 4 is composed of four chuck pieces 4a, 4b, 4
An example of division into c and 4d is shown, but the number of divisions is 2
The above is sufficient. Further, in the embodiment, the disk is chucked by pressing the side surface of the central opening of the disk, but the chuck may be one that presses the peripheral surface of the central opening, and the disk to be chucked further. Is not limited to a magnetic disk or an optical disk, and may be a substrate of these, for example.

[0017]

As described above, according to the present invention, the ring member for disc chuck is configured by being divided into a plurality of chuck pieces, while the space between the pieces or the chuck piece is divided. Radially arranged fins (collars) that are inserted into the formed guide grooves
By providing the guide member having the above, the guide member guides the forward and backward movement of each piece that moves forward and backward with respect to the central opening of the disc. As a result, when the disc is chucked, the disc surface is less likely to be distorted, and is suitable for chucking a thin disc with a small diameter and high speed rotation,
In addition, it is possible to easily realize a disc chuck mechanism that can perform a smooth chucking / unchucking operation.

[Brief description of drawings]

FIG. 1 is a partial enlarged cross-sectional view of a disc chuck mechanism and an uncucked state of a disc chuck mechanism according to an embodiment of the present invention.

2A and 2B are explanatory views of a chuck piece and a guide member, FIG. 2A is a perspective view of the chuck piece, and FIG.
[Fig. 4] is a perspective view of a guide member. FIG. 2 is a perspective view of the guide member.

FIG. 3 is a plan view of a disk chuck mechanism with a head plate removed so that an internal state can be seen.

FIG. 4 is an explanatory diagram of a relationship between a guide member and a radial chuck piece of a disc chuck mechanism of another embodiment.

FIG. 5 is a partial cross-sectional explanatory view of a conventional disc chuck mechanism.

FIG. 6 is an explanatory diagram of a chuck ring of a disc chuck mechanism.

FIG. 7 is an enlarged explanatory view of a chuck portion of the disc chuck mechanism.

[Explanation of symbols]

1 ... Disc, 2, 10 ... Disc chuck mechanism, 3,
43 ... Guide member, 4 ... Radial chuck, 4a, 4
b, 4c, 4d, 41 ... Chuck piece, 5 ... O type elastic ring, 6 ... Insertion groove, 11 ... Head disc, 12 ... Coupling rod, 13 ... Chuck ring, 14 ... Cylinder, 13
a, 15 ... Inclined surface, 14a ... Cylinder body, 14b, 1
4c ... Flange portion, 15a ... Cone boss, 15b ... Cylindrical block, 16 ... Coil spring, 17 ... Pressing disc,
18 ... Diaphragm, 19 ... Abutment ring, 20 ... Ring part, 21 ... Opening, 22 ... Vertical groove, 23 ... Horizontal groove, 24 ... Tip part, 25 ... Spring, 26 ... Spring storage groove, 30
... Blocks, 31, 32, 33, 34, 45 ... Fins,
40 ... Divided space, 42 ... Guide groove, 44 ... Disc.

Claims (4)

[Claims] 1. A ring member is engaged with an inclined surface provided on the inner side of the ring member to extend along the inclined surface to increase the diameter of the ring member and press the side surface of the central opening of the disk or its peripheral surface. In the disc chuck mechanism for chucking the disc by means of reducing the diameter of the ring member along the inclined surface to release the disc, the ring member is divided into a plurality of independent ring-shaped members. An elastic ring that is configured by a piece and is urged in a direction to reduce the diameter of the ring formed by each piece by engaging with each piece, and enlarging or reducing the diameter of the formed ring. A guide member that guides the advance / retreat of each piece advancing / retreating with respect to the central opening by a plurality of fins extending radially in the radial direction of the formed ring. A disc chuck mechanism comprising. 2. The disc chuck mechanism according to claim 1, wherein the fin is arranged above the elastic ring in a space between the divided pieces. 3. The disc chuck mechanism according to claim 1, wherein a groove in which the fin is loosely fitted is provided on the piece above the elastic ring. 4. A circular groove which is substantially equal to or slightly larger than the inner diameter which is the diameter of the central opening of the disk provided in the peripheral portion of the tip surface for receiving the disk, and which is provided inside the circular groove. A cylinder having a conical convex portion and a through hole provided in the center, a rod penetrating the through hole and sliding along the through hole, and a rod on the conical convex portion side of the rod. A disc having a diameter corresponding to the inner diameter of the disc, which is provided at the tip of the protruding side, and a back surface is attached to an inclined surface of the conical convex portion provided between the disc and the conical convex portion. And a ring member that expands in diameter and presses the side surface of the central opening of the disk or its peripheral surface to chuck the disk, and reduces the diameter along the inclined surface to open the disk, The rod at the rear of the cylinder In a disc chuck mechanism including a biasing member that biases the ring member in a pulling direction, the ring member is divided into a plurality of independent pieces arranged in a ring shape, and the ring member is engaged with each of the pieces. Then, an elastic ring that urges the ring formed by each piece in a direction to reduce the diameter of the ring, and an advance and retreat of each piece that moves back and forth with respect to the central opening according to the expansion and contraction of the diameter of the formed ring. A disc chuck mechanism comprising: a guide member that is guided by a plurality of fins that radially extend in a radial direction of the formed ring.