JP2002334449A - Optical pickup, and disk drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a bad influence of oil used at a guide shaft of a moving base which composes an optical pickup, upon a dual shaft actuator. SOLUTION: A lubricant oil is applied to the guide shaft which supports the moving base 7 to slide freely along the radial direction of a disk-shaped recording medium, and for the moving base, an oil stoppers 11 for the lubricant oil are formed between the guide shaft and a position corresponding to the movable part of the dual shaft actuator. Thus, the intrusion of the lubricant oil applied on the guide shaft into the movable part of the dual shaft actuator is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup and a disk drive device, wherein a lubricating oil used for a guide shaft of a moving base constituting the optical pickup is:
The present invention relates to a technique for preventing entry into a movable portion of a two-axis actuator.

[0002]

2. Description of the Related Art There is a disk drive device for recording and reproducing signal information on and from a disk-shaped recording medium. The disk drive is moved in a radial direction of the disk-shaped recording medium mounted on a disk table, and a laser is applied to the disk-shaped recording medium. An optical pickup (optical head device) for irradiating light is provided.

An optical pickup has a configuration in which a biaxial actuator is mounted on a moving base (or slide base). Note that a drive mechanism (including a feed shaft and a drive source) and a guide mechanism for moving the disk-shaped recording medium in the radial direction are provided for the moving base.

A coil is provided for a two-axis actuator. When the actuator is mounted on a moving base, the coil is electromagnetically applied to a yoke and a magnet provided on the moving base for field use. It is configured to be combined. A yoke exists as a member that regulates one side of the movable range of the objective lens in the focus direction with respect to the movable portion of the biaxial actuator (that is, the yoke is used for abutting the movable portion, and the yoke is used to abut the movable portion. Further movement of the movable part is restricted.)

[0005] In order to smoothly move the moving base, oil (lubricating oil) is applied to a shaft constituting a guide shaft of the moving base.

[0006]

However, in the conventional configuration, if the oil travels on the moving base and penetrates to the position of the above-mentioned abutting portion against the yoke, the oil causes a problem. There is a possibility that the movement of the shaft actuator may be hindered. For example, a worst case may occur in which the movable portion of the two-axis actuator sticks to the abutting portion of the yoke due to the adhesion of the lubricating oil.

Accordingly, an object of the present invention is to eliminate an adverse effect on a two-axis actuator due to oil used for a guide shaft of a moving base.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a guide shaft for slidably supporting a moving base which is moved in a radial direction of a disk-shaped recording medium. Oil is applied, and an oil stopper for lubricating oil is formed on the movable base between the guide shaft and a position corresponding to the movable portion of the biaxial actuator.

Therefore, according to the present invention, since the lubricating oil applied to the guide shaft does not enter the movable portion of the biaxial actuator beyond the oil stopper, the movement of the movable portion is hindered. No more.

[0010]

FIG. 1 shows an example of the basic configuration of a disk drive according to the present invention.

The disk drive device 1 has required members and mechanisms arranged in an outer casing 2, and only the main parts are shown in the figure.

A chassis (not shown) is disposed in the outer casing 2, and a disk table (or turntable) is mounted on a motor shaft of a spindle motor mounted on the chassis.
3 is fixed.

A pair of parallel guide shafts 4 and 5 are attached to the chassis, and a feed shaft (lead screw) rotated by a feed motor is supported (not shown).

The optical pickup 6 has a moving base (or slide base) 7 made of a metal material such as zinc or a synthetic resin material. The moving base is driven by an objective lens 8a to control the focus. Axis actuator 8 for performing tracking control
Is installed. Bearings 7a and 7b provided at both ends of the movable base 7 are slidably supported by guide shafts 4 and 5, respectively. In other words, the bearing 7a is guided while being engaged with the guide shaft 4, and the bearing 7b is guided while being inserted through the guide shaft 5.

The drive mechanism of the movable base 7 is described below.
For example, a nut member (not shown) provided on the moving base is screwed into a lead screw, and when the drive motor rotates the lead screw, the nut member is sent in a direction corresponding to the rotation direction of the lead screw. I have. Thereby, the optical pickup 6 is moved in the radial direction of the disk-shaped recording medium 100 mounted on the disk table 3. In addition, since the disk-shaped recording medium 100 is not limited to any form, it goes without saying that the present invention can be widely applied to devices using a magneto-optical disk, a phase-change disk, or the like.

FIGS. 2 to 4 show examples of the configuration of the optical pickup.

FIG. 2 shows a state in which a biaxial actuator 8 is mounted on the moving base 7, FIG. 3 shows a single unit of the moving base 7, and FIG. Is shown. FIG. 4 shows a state in which the yoke 9 is attached to a position of the movable base 7 where the biaxial actuator 8 is arranged (illustration of the magnet is omitted). As is well known, a coil 8b (see FIG. 2) corresponding to the yoke 9 is provided on the two-axis actuator 8 so that both are electromagnetically coupled. About the department,
One side (lower limit position) of the movable range in the focus direction is regulated by a part of the yoke 9. That is, the yoke 9 shown in FIG. 4 has an F-shape that is turned sideways as viewed from the side, and the base 9A of the protruding portion corresponds to the abutting portion described above. The movement of the movable part of the actuator 8 is restricted. The other limit (upper limit position) of the movable portion of the two-axis actuator 8 in the movable range in the focus direction is restricted by a metal that is bridged over two protruding end portions of the yoke 9 and connects the two. 9B (see FIG. 2).

As shown in FIG. 4, the above-mentioned bearing portion 7b has an insertion hole 10 for a shaft constituting the guide shaft 5.
Are formed. That is, the shaft is supported in a state where the shaft is inserted through the insertion hole 10. When the lubricating oil applied to the shaft travels through the movable base 7 and enters the movable part of the biaxial actuator 8, there is a high possibility that the movement of the movable part is adversely affected as described above.

Therefore, in the present invention, an oil stopper (oil stopper) is formed on the moving base to prevent the lubricating oil applied to the guide shaft from spilling over to the portion of the moving base where the biaxial actuator is disposed. In consideration of the necessity of stopping the oil before reaching the movable part of the two-axis actuator, the oil stopper has a guide shaft that slidably supports the movable base on the movable base, It is formed between a position corresponding to the movable portion of the shaft actuator.

For example, as shown in FIG. 3 and FIG. 4 (see the inside of a large circle showing an enlarged main part), the oil stopper 1
Grooves are formed as 1 and 11, and these grooves prevent oil from entering. In this example, each groove is formed along a direction parallel to the axial direction of the guide shaft 5, and even if the lubricating oil goes around the moving base side, the lubricating oil is pushed over the groove. It does not reach the contact portion 9A. In other words, this groove is provided with an inner moat (or 2
It functions as an outer moat for the arrangement portion of the shaft actuator 8).

As the oil stopper, in the above example,
Although the grooves are formed on both sides of the hole formed in the moving base 7, the present invention is not limited to this.

[0022]

As is apparent from the above description, according to the first aspect of the present invention, the lubricating oil applied to the guide shaft enters the movable portion of the two-axis actuator beyond the oil stopper. As a result, the movement of the movable portion is not hindered. Therefore, the reliability of the control of the two-axis actuator can be improved.

According to the second aspect of the invention, the quality of a product can be improved in a disk drive device using an optical pickup.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a basic configuration of a disk drive device.

FIG. 2 is a diagram illustrating a configuration example of an optical pickup.

FIG. 3 is a diagram illustrating a configuration example of a movement base.

FIG. 4 is a diagram showing a main part of a moving base.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive device, 3 ... Disk table, 5
... guide shaft, 6 ... optical pickup, 7 ... moving base,
11: oil stopper, 100: disk-shaped recording medium

Claims (2)

[Claims] 1. An optical pickup comprising a moving base moved in a radial direction of a disk-shaped recording medium and a biaxial actuator mounted on the moving base, wherein the moving base is slidably supported. Lubricating oil is applied to the guide shaft, and an oil stopper for lubricating oil is formed on the movable base between the guide shaft and a position corresponding to the movable portion of the biaxial actuator. Optical pickup. 2. A disk table on which a disk-shaped recording medium is mounted and rotated, a moving base that is moved in a radial direction of the disk-shaped recording medium mounted on the disk table, and a two-axis mounted on the moving base. In a disk drive device including an optical pickup having an actuator, lubricating oil is applied to a guide shaft that slidably supports the movable base, and the movable base is movable by the guide shaft and the two-axis actuator. An oil stopper for lubricating oil is formed between the disk drive device and a position corresponding to the portion.