JPH10208377A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the space of a driving part and to make an optical disk device thin by providing a chucking mechanism for a disk and a positioning member on a disk accepting part, which is arranged at the center part of an integrally molded rotor case. SOLUTION: The positioning member 25 is constituted so as force-fitted into a housing 21 which is force-fitted into a driving shaft 20, and accurately arranged onto a rotary shaft of the driving shaft 20 to control the eccentric part of the optical disk. The positioning member 25 is also constituted so as to hold a chucking member 23 chucking the optical disk, and by these constitutions, the optical disk is easily chucked, and the control for the eccentric part of the optical disk is also attained. Thus, protruding parts of the positioning member 25 are projected from holes of three places among six places of the rotor case 18 in the assembled state, and the eccentric amount of the protruding part is suppressed to smaller than the prescribed value. Then, even in the case the optical disk is mounted on the rotor case 18, the optical disk is mounted in the fine positional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reading information from an optical disk such as a video disk, a compact disk, or a magneto-optical disk, or writing information to the optical disk.

[0002]

2. Description of the Related Art First, a conventional optical pickup module for recording and reproducing data on a high-density recording disk and a compact disk will be described with reference to FIGS.

FIG. 7 is a diagram showing the entire configuration of a conventional optical pickup module. Reference numeral 1 denotes an objective lens for reading information from an optical disk, and reference numeral 2 denotes a carriage on which the objective lens 1 is mounted.

[0004] The objective lens 1 can be moved to the inner and outer circumferences of the optical disk by the feed motor 3 together with the carriage 2. Reference numeral 4 denotes a spindle unit for holding and rotating the optical disk, and also has a function of clamping the optical disk. The optical pickup module 5 includes the objective lens 1, the carriage 2, the feed motor 3, and the spindle unit 4.

Next, the turntable portion of the spindle unit will be described with reference to FIGS. Here, FIG. 8 is a plan view of the spindle unit of FIG. 7, and FIG.
FIG. 10 is an enlarged view of a main part of FIG. 9, and FIG. 11 is a perspective view showing the shape of the optical disk.

In FIGS. 8 and 9, reference numeral 6 denotes a turntable on which an optical disk is mounted, which is generally a molded part made of a resin or a saw-milled part. A shaft 7 is attached to the turntable 6 by integral molding or press fitting. Further, a slip sheet 8 is attached to the upper surface of the turntable 6 in order to prevent the optical disk from slipping due to the driving of the spindle motor. 9 is a chucking member for chucking the optical disk,
It is always pressed outward by the O-ring 10.

Also, the chucking member 9 and the O-ring 1
The stopper 11 is press-fitted into the turntable 6 to hold 0.

The drive unit of the spindle motor has a magnet 12 attached to a turntable 6, and a housing 15 in which a spindle metal 14 is press-fitted into a spindle base 13 in a cylindrical shape receives a thrust force of the turntable 6. With the thrust plate 16. The drive coil 3 is provided on the spindle base 13.
0, and driven by a power supply line (not shown).

Next, with reference to FIGS. 10 and 11, the positioning of the optical disk when the optical disk is mounted on the turntable 6 will be described.

The inner diameter shape (dimension a) of the optical disk D shown in FIG. 11 must be between 15.0 and 15.1 mm in diameter according to the standard. Here, in order to mount the optical disk on the turntable 6 with high accuracy, the center hub portion 17 of the turntable 6 is formed or processed with high accuracy, and the dimension b shown in FIG. 10 has a diameter of 14.98 to 14.9.
9 mm, and the eccentric component of the center hub 17 is also 15 μm or less. Thus, even when the optical disk D is mounted on the turntable 6, the optical disk D can be chucked with high accuracy by the regulation of the center hub portion 17.

[0011]

In recent years, there has been an increasing demand for higher-speed reading, and as a result, the torque required of the spindle motor has also increased. In the case of a notebook PC built-in type, there is also a demand for a thinner spindle portion because the height of the center hub portion of the turntable directly affects the height of the drive device.

As a countermeasure, a turntable formed of a conventional material such as resin or brass is used as a sheet metal aperture to reduce the weight, thereby reducing the motor loss and increasing the torque. . Further, it is possible to reduce the thickness for obtaining the same rigidity as that of the resin base, and as a result, it is possible to secure a space for the drive unit and to reduce the overall thickness.

However, when the turntable is formed of a sheet metal, it is difficult to obtain the dimensional accuracy of the center hub portion because the drawing is performed as an integral part and there is a deep drawing portion. As a result, an eccentric component of the optical disk becomes large when the optical disk is mounted, which causes a problem that accurate reading is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disk apparatus provided with a sheet metal turntable which can be made thinner than conventional ones made of resin or the like and which can accurately position an optical disk. I do.

[0015]

According to the present invention, there is provided an optical disk apparatus having a turntable-integrated rotor case in which a turntable and a rotor case are integrally formed by sheet metal. A chucking mechanism for a disk is provided in a disk receiving portion provided at a central portion of the device, and a positioning member protruding from an outer peripheral surface of the disk receiving portion is provided.

As a result, an optical disk device that can be made thinner and that can accurately mount the optical disk on the turntable is obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an optical disc apparatus having a turntable integrated rotor case in which a turntable and a rotor case are integrally formed by sheet metal, wherein the rotor case has An optical disc device, comprising: a chucking mechanism for a disc provided in a disc receiving portion provided at a central portion; and a positioning member protruding from an outer peripheral surface of the disc receiving portion. However, by providing the positioning member, the eccentric component of the optical disk can be suppressed.

According to a second aspect of the present invention, in the optical disk device according to the first aspect, the positioning member is a member having a central portion positioned on a drive shaft and having a projecting portion on an outer peripheral portion. As a result, an accurate product can be obtained by simple assembly.

According to the third aspect of the present invention, the positioning member is made of metal, and high durability can be obtained.

According to a fourth aspect of the present invention, three projections constituting the chucking mechanism are arranged at equal intervals on the outer periphery of the receiving portion, and the projection of the positioning member is provided with the chucking mechanism. The optical disk device according to any one of claims 1 to 3, wherein the optical disk device is disposed at an intermediate position between the constituent protrusions, thereby enabling stable chucking and positioning.

An optical disk device according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a spindle unit in the optical disc device of the present embodiment,
2 is a sectional view taken along the line BB of FIG. 1, FIG. 3 is a plan view of the turntable-integrated rotor case shown in FIG. 1, FIG. 4 is a sectional view taken along the line CC of FIG. 3, and FIG. FIG. 6 is a cross-sectional view taken along line DD of FIG. 5.

1 to 4, reference numeral 18 denotes a turntable-integrated sheet metal rotor case. Six holes 18a are formed in a disk receiving portion formed at the center of the rotor case 18. The reason why the holes 18a are provided at the six positions is that the three holes are provided with chucking members for stably holding the optical disk, and the remaining three positions restrict the positioning of the eccentric component of the optical disk. This is because the positioning member is provided. A slip sheet 19 is provided on the outer periphery of the upper surface of the rotor case 18 to prevent slippage during driving of the optical disk. The drive shaft 20 is press-fitted into a brass housing 21, and the housing 21 is caulked to the rotor case 18. Reference numeral 22 denotes a driving cylindrical magnet, which is bonded and fixed to the inner peripheral portion of the rotor case 18.

Next, the mechanism of chucking in the above device will be described. Reference numeral 23 denotes a chucking member formed of resin, which is provided at three locations in the radial direction, protrudes from three of the six holes 18a of the rotor case 18, and is always pressed by a U-shaped leaf spring 24. It is designed to rotate in a state where it is done. Also, the rotor case 18
The projections 25a of the positioning member 25 shown in detail in FIGS. 5 and 6 project from the remaining three holes 18a. Returning to FIG. 2, the chucking member 2
3 prevents the housing 26 from rotating too much.
Press-fit.

The stator portion has a spindle base 27 serving as a base. The metal housing 28 receives a thrust force of a turntable portion so as to hold the drive shaft 20 and maintain good lubrication during rotation. Together with the spindle base 27. The driving coil 30 is press-fitted into the metal housing 28 and is driven by a power supply line (not shown).

As described above, the rotor case is made of an integral sheet metal and is a turntable-integrated rotor case. By forming the disk receiving portion at the center of the rotor case, the space for the drive portion can be secured and the torque can be increased. Leads to.
Further, the weight of the turntable unit (rotary body) can be reduced, and a motor with less loss can be realized. However, on the other hand, since the turntable is a one-piece drawing process,
The dimension c shown in FIG. 4 cannot be manufactured more accurately than a resin product.

On the other hand, when the optical disk is mounted on the rotor case 18, it is necessary to prevent the inner diameter dimension a of the optical disk from hitting the rotor case 18, so that the dimension c of the rotor case is about 14.8 mm or less in diameter. Therefore, a gap is easily generated between the inner diameter of the optical disk and the dimension c of the rotor case. Therefore, an eccentric component is generated when the optical disk is mounted on the rotor case 18, which may hinder information reading of the optical disk.

As a countermeasure, in the present embodiment, a positioning member 25 for regulating the eccentric component of the optical disk is provided. The positioning member 25 has a shape shown in the plan view of FIG. 5 and the cross-sectional view of FIG. 6, and as shown in FIG. 5, the positioning member 25 is formed of a single metal member. , Center hole 25 of positioning member 25
The disk inner diameter receiving portions (indicated by the dimension d in FIG. 6) of the three protruding portions 25a with respect to b are formed with high precision.

As shown in FIG. 2, the positioning member 25 is press-fitted into the housing 21 press-fitted into the drive shaft 20, and is positioned with respect to the center (rotation axis) of the drive shaft 20. The 25 dimension d portion is arranged with high accuracy, and it is possible to regulate the eccentric component of the optical disk. The positioning member 25 is configured to hold the chucking member 23 for chucking the optical disk. With this configuration, the optical disk can be easily chucked and the eccentric component of the optical disk can be regulated.

Thus, in the assembled state,
The protrusion 25a of the positioning member 25 projects from three of the six holes 18a of the rotor case 18, and the dimension d of the protrusion 25a shown in FIG. 6 is 14.98 to 14.9 in diameter.
Since it is possible to manufacture accurately between 9mm,
The amount of eccentricity of the three protruding portions 25a can also be suppressed to 15 μm or less. Thus, even when the optical disk is mounted on the rotor case 18, the optical disk can be mounted with high positional accuracy by the three projecting portions 25a of the positioning member 25.

A chucking member 23 is attached to the positioning member 25, and the chucking member 23 protrudes from the remaining three holes 18a of the rotor case 18, so that the chucking member 23 is integrated with the turntable. With the use of the rotor case 18 described above, it is possible to have a mechanism for regulating the amount of eccentricity of the optical disk and chucking the optical disk with a simple structure.

[0031]

As is apparent from the above description, according to the present invention, the turntable portion is formed integrally with the rotor case by sheet metal, and the disk receiving portion provided at the center of the rotor case has a disk receiving portion. By providing the chucking mechanism and the positioning member, it is possible to secure a space for the driving unit and to reduce the thickness, and to mount the optical disk on the turntable with high accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view of a spindle unit in an optical disk device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a plan view of the turntable-integrated rotor case shown in FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 3;

FIG. 5 is a plan view of the positioning member shown in FIG. 2;

FIG. 6 is a sectional view taken along line DD of FIG. 5;

FIG. 7 is an overall configuration diagram of a conventional optical pickup module.

FIG. 8 is a plan view of the spindle unit shown in FIG. 7;

9 is a sectional view taken along line AA of FIG. 8;

FIG. 10 is an enlarged view of a main part of FIG. 9;

FIG. 11 is a perspective view showing the shape of an optical disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Carriage 3 Feed motor 4 Spindle part 5 Optical pickup module 6 Turntable 7 Shaft 8 Slip sheet 9 Chucking member 10 O-ring 11 Stopper 12 Magnet 13 Spindle base 14 Spindle metal 15 Housing 16 Thrust plate 17 Center hub part Reference Signs List 18 rotor case 18a hole 19 slip sheet 20 drive shaft 21 housing 22 magnet 23 chucking member 24 leaf spring 25 positioning member 25a projecting portion 25b center hole 26 lid 27 spindle base 28 metal housing 29 thrust plate 30 driving coil

Claims (4)

[Claims] An optical disk drive having a turntable integrated rotor case in which a turntable and a rotor case are integrally formed by sheet metal, wherein a disk receiving portion provided at a center portion of the rotor case has a disk chuck. An optical disc device comprising a king mechanism and a positioning member protruding from an outer peripheral surface of the disc receiving portion. 2. The optical disk device according to claim 1, wherein said positioning member is a member whose center portion is positioned on a drive shaft and has a protruding portion on an outer peripheral portion. 3. The optical disk device according to claim 1, wherein said positioning member is made of metal. 4. A projection constituting the chucking mechanism is arranged at three locations on an outer periphery of the receiving portion at equal intervals.
4. The optical disk device according to claim 1, wherein the protrusions of the positioning member are arranged at intermediate positions of the protrusions constituting the chucking mechanism.