JPH05151694A - Disk driving device - Google Patents

Abstract

PURPOSE:To miniaturize the device by disposing a reference shaft for guiding the lifting motion of a spindle motor above the diameter of a spindle motor in the direction nearly perpendicular to the moving direction of an actuator part. CONSTITUTION:At least the reference shaft of plural pieces of the shafts 7 for guiding the lifting motion of the spindle motor 5 of the disk driving device is disposed above the diameter of the spindle motor 5 in the direction nearly perpendicular to the moving direction of the actuator part 20. The reference shaft is provided in the direction perpendicular to the moving direction of the actuator part 20 and, therefore, the displacement in the vertical direction of the disk 4 is little when the reference shaft of the disk driving device constituted in the above-mentioned manner inclines from the prescribed angle with a chassis 3. Consequently, the moving amt. of the head moving in follow up to the displacement of the disk 4 decreases and the device is miniaturized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an optical disk device,
The present invention relates to a disc drive device provided in a recording / reproducing device for recording / reproducing information on / from a disc-shaped recording medium (hereinafter referred to as a disc), and rotationally driving the disc.

[0002]

2. Description of the Related Art Conventionally, an optical disc apparatus for recording / reproducing information on / from a disc rotatably housed in a cartridge has a spindle motor for rotationally driving the disc fixed to move the disc up and down. It was attached to and detached from the motor.

However, according to the conventional disk drive device constructed as described above, since a cartridge having a relatively large area is attached to and detached from the device by a loading mechanism having a complicated structure, the device becomes large and the mechanism becomes complicated. There was a problem of becoming. Also, because the reference pin is provided on the chassis to position the cartridge,
The cartridge could not be securely held on the chassis, and the disk might resonate.

In order to solve such a problem, a cartridge holder as a supporting means for detachably supporting a cartridge is fixed to a chassis, and a spindle motor is moved up and down to make a disk in the cartridge mounted on the cartridge holder serve as a motor. A disk drive device having a detachable structure has been proposed.

3 to 5 show an example of the structure of such a disk drive device. 3 and 4, the cartridge 1 and the cartridge holder 2 shown in FIG. 5 are removed and shown in order to clarify the internal structure of the apparatus. The cartridge 1 is attached to the chassis 3 formed in a substantially rectangular plate shape.
A spindle motor 5 is provided as a rotation driving means for rotationally driving a disk 4 rotatably housed therein. The spindle motor 5 is concentrically held and fixed in a casing 6, and a plurality of, for example, two guide shafts 7 as guide means standing upright in a direction perpendicular to the chassis 3 are slidable in the casing 6. Penetrates. The spindle motor 5 is guided by the guide shaft 7 and can move up and down in the axial direction.

On one side of the chassis 3 on the side where the spindle motor 5 is provided, a loading motor 8 as an elevating and lowering drive means for the spindle motor 5 is provided. The loading motor 8 is composed of a stepping motor or the like, and the output shaft 9 of the loading motor 8 is a guide shaft 7.
It is at a right angle to. Further, a cam 10 is fixed to the output shaft 9 as a positioning means for regulating the vertical position of the spindle motor 5. The pin 1 is provided so that the outer peripheral surface of the cam 10 protrudes to the outer periphery of the casing 6.
1, the spindle motor 5 is rotated by the rotation of the output shaft 9.
The elevating position of is positioned. The casing 6
A pair of protrusions 12 is provided on the outer periphery of the coil spring 13. A coil spring 13 is mounted between the protrusion 12 and the chassis 3 to urge the cam 10 and the pin 11 in the contacting direction. ing.

On the other hand, a pair of guide rails 14 whose center line is located on the diameter of the disk 4 are provided on the chassis 3, and the carriage 1 is guided by the guide rails 14.
5 is moved and driven by an actuator (not shown).
A head 16 and an objective lens 17 are attached to the tip of the carriage 15.
Are provided so as to face each other, and the disk 4 is inserted between the head 16 and the objective lens 17 at a predetermined interval. Further, below the carriage 15 and on the optical axes of the head 16 and the objective lens 17, a reflecting mirror 19 that reflects the light emitted from the optical member 18 provided in the chassis 3 toward the objective lens 17 side is provided. And the guide rail 14,
The carriage 15, the head 16, the objective lens 17, the reflecting mirror 19, and the like, and the actuator unit 2 as a moving unit.
Configures 0.

A cartridge holder 2 as a cartridge supporting means fixed in parallel to the chassis 3 is provided above the spindle motor 12, and when the cartridge 1 is inserted to a predetermined position in the cartridge holder 2, loading is performed. The motor 8 rotates. Then, the spindle motor 5 ascends together with the casing 6 by the biasing force of the coil spring 13 while coming into contact with the cam 10, and the loading motor 8 stops rotating and is positioned at a predetermined position. At this time, the spindle of the spindle motor 5 engages with the center hole of the disk 4. Next, the actuator section 20 moves in the diameter direction of the disk 4, and the light emitted from the optical member 18 causes the head 16 to read the information formed on the disk 4.

[0009]

In the cartridge holder fixed type disk drive device constructed as described above, the spindle motor 5 is guided by the two guide shafts 7 via the casing 6 so as to be vertically movable. ing. The guide shaft 7 is composed of a reference shaft 7a and a detent shaft 7b, and the reference shaft 7a is slidably inserted into a through hole formed in the casing 6 without a gap. The rotation stopping shaft 7b is inserted into a through hole formed in the casing 6 with a slight gap. In the conventional case, the reference shaft 7a is shown in FIG.
As shown in FIG. 4, the actuator is provided on the side opposite to the actuator unit 20 with respect to the rotation center on a line that passes through the rotation center of the spindle motor 5 and is parallel to the moving direction of the actuator unit 20.

As a result, when the reference shaft 7a is inclined from the normal angle, the vertical displacement of the disc 4 on the side opposite to the reference shaft 7a with respect to the center of the disc 4 becomes large. On the other hand, the head 16 and the objective lens 17 provided in the actuator unit 20
Is controlled so that the distance between the disk 4 and the disk 4 is constant. Therefore, when the vertical displacement of the disk 4 becomes large, the head 16 and the objective lens 17 also need to have a large movement amount, and the apparatus is There was a problem of increasing the size.

The present invention has been made in view of such a situation, and the disk can be downsized by reducing the vertical displacement of the disk and the moving amount of the head and the objective lens. An object is to provide a drive device.

[0012]

DISCLOSURE OF THE INVENTION A disk drive device of the present invention comprises a spindle motor 5 as a drive means which is mounted on a chassis 3 so as to be capable of moving up and down, and rotationally drives a disk 4 as a disk-shaped recording medium, and a spindle motor 5. And a guide means composed of a plurality of shafts 7 for guiding the raising and lowering movement of the disk 4,
In a disk drive device having a head 16 for recording / reproducing information on and from the shaft, and an actuator section 20 as a moving means for moving the disk 4 in the diametrical direction, at least the reference axis 7a of the shaft 7 is connected to the actuator section 2
It is characterized in that it is arranged on the diameter of the spindle motor 5 in a direction substantially perpendicular to the moving direction of 0.

[0013]

In the disk drive device having the above structure, when the reference shaft 7a is tilted at a predetermined angle with respect to the chassis 3, the reference shaft 7a is provided in the same direction as the moving direction of the actuator section 20 as in the conventional example. Since it is provided in the right angle direction, the vertical displacement of the outer peripheral portion of the disk 4 is smaller than that in the case where the disk 4 is provided. This results in disc 4
The amount of movement of the head 16 and the like, which moves following the displacement of, is also small, and the device can be downsized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive device of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the essential part of an embodiment of the present invention. In FIG. 1, parts corresponding to those of the conventional example shown in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. The feature of this embodiment lies in the mounting position of the reference shaft 7a, and the overall structure of the disk drive device is the same as that of the conventional example shown in FIGS. The reference shaft 7a is in a direction substantially perpendicular to the moving direction of the actuator unit 20
Are arranged on the diameter of. The detent shaft 7b is also arranged on the same diameter of the spindle motor 5.

According to the present embodiment, the positional accuracy of the reference shaft 7a, the verticality with respect to the chassis 3, the reference shaft 7a and the mounting hole formed in the casing 6 are different from those in the conventional example shown in FIGS. If the tolerances such as the gap between them are the same, the amount of displacement at a certain position of the track of the disk 4 with respect to the specified position is smaller than in the conventional example. For example, the displacement amount of 0.28 mm in the conventional example becomes 0.19 mm. Therefore, the amount of movement of the head 16 or the like that moves following the displacement of the disk 4 is also small, and the device can be downsized.

In the above embodiment, the case where the recording / reproducing apparatus is an optical disk apparatus has been described, but the same effect can be obtained by applying the invention to another recording / reproducing apparatus using a disk.

[0018]

As described above, according to the disk drive device of the present invention, the reference shaft for guiding the up-and-down movement of the spindle motor for rotating the disk is set in a direction substantially perpendicular to the moving direction of the actuator section. Since it is arranged on the diameter of the spindle motor, the vertical displacement of the disk due to the inclination of the reference axis can be reduced. As a result, the amount of movement of the head or the like that follows the displacement of the disk also becomes small, and the device can be made compact.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a main part of an embodiment of a disk drive device of the present invention.

FIG. 2 is a perspective view showing the configuration of an example of a conventional disk drive device.

FIG. 3 is a plan view of FIG.

FIG. 4 is a side view of FIG.

[Explanation of symbols]

 3 chassis 4 disk (disc-shaped recording medium) 5 spindle motor (driving means) 7 guide shaft (guide means) 7a reference shaft 16 head 20 actuator section (moving means)

Claims (1)

[Claims] 1. A means for rotating and driving a disk-shaped recording medium, which is mounted on a chassis so as to be able to move up and down, a guide means composed of a plurality of shafts for guiding an ascending / descending operation of the drive means, and recording information on the recording medium. In a disk drive device having a head for performing reproduction mounted thereon and moving means for moving in the diametrical direction of the recording medium, at least the reference axis of the guiding means is at a right angle to the moving direction of the moving means. The disk drive device is arranged on the diameter of the drive means in the direction.