JPH11185410A - Optical-disk driving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical-disk driving apparatus in which an optical pickup in a traverse mechanism is protected from the influence of a fall, a shock, a vibration or the like during its transport and in which a mechanism used to prevent a traverse feed screw and a feed nut from being engaged with each other in the innerpost circumferential position or the outermost circumferential position of the optical pickup is realized easily, at low costs, with a reduced number of components and with high reliability. SOLUTION: Except for the innermost circumferential position or the outermost circumferential position of an optical disk in an optical pickup 15, the displacement amount of a nut plate 19 which is fitted to a driving shaft 16 is regulated in such a way that the regulation part of the nut plate 19 is brought into contact with the face of a traverse chassis 14. The fitting operation and the separating and removing operation of the nut plate 19 are prevented. Through holes 14e, 14f are formed in the traverse chassis 14 in such a way that the regulation part of the nut plate 19 is not brought into contact with the face of the traverse chassis 14 in the innermost circumferential position or the outermost circumferential position of the optical disk in the optical pickup 15, and its regulation is released. It is possible to prevent the driving shaft 16 and the nut plate 19 from being engaged with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive for moving an optical pickup in an optical disk device in a radial direction of the optical disk.

[0002]

2. Description of the Related Art An optical pickup in an optical disk device is a precision mechanism component, and is susceptible to drop, impact, vibration, and the like during transportation. To maintain initial performance, it is necessary to protect the optical pickup from these effects. As a configuration for achieving the object, a configuration described in, for example, JP-A-5-81681 is known.

Hereinafter, a conventional traverse mechanism will be described with reference to the drawings. 5 to 8 show a conventional traverse mechanism, in which 1 is a traverse chassis, 2 is an optical pickup, 3 is a drive shaft, 4 is a drive gear, 5 is a thrust spring, 6 is a nut plate, and 7 is The drive shaft 3 penetrates the bearings 2a and 2b of the optical pickup 2, one end 3a is rotatably held in a bearing hole 1a formed on the traverse chassis 1, and the other end 3b is the drive gear. The driving gear 4 is held by being press-fitted into the shaft 4, and the shaft 4 a of the driving gear 4 is rotatably held by a bearing 1 b on the traverse chassis 1. Also, the drive shaft 3 has an outer diameter D3 of the central portion F at both ends of the central portion F which is a reproduction range of the optical disk 13.
Small thread portions E1 and E2 having smaller outer diameters D1 and D2 are formed. The optical pickup 2 has a guide portion 2c engaged with a sub shaft 1c on the traverse chassis 1, and an arrow AB
It can slide in any direction. The thrust spring 5 is press-fitted and held in a fixed portion 1 d on the traverse chassis 1, abuts on the tip 4 b and the shaft 4 a of the drive gear 4, and moves the drive shaft 3 through the drive gear 4 in the directions of arrows A and D. Direction. The nut plate 6 and the stopper 7 are fixed to the optical pickup 2 with screws 8, and the protrusion 6 a formed on the nut plate 6 is used as the worm 3 c of the drive shaft 3.
Is engaged. Reference numeral 9 denotes a traverse motor, and 10 denotes a motor gear. The traverse motor 9 is fixed on the traverse chassis 1, and press-fits the motor gear 10 to its rotating shaft 9a to press-fit and hold the motor gear 10. The motor gear 10 meshes with the drive gear 4 and the traverse motor 9
Is transmitted to the drive shaft 3. Reference numeral 11 denotes a spindle motor, and 12 denotes a turntable. The spindle motor 11 is fixed on the traverse chassis 1, and its rotary shaft 11a is pressed into the turntable 12 on which the optical disk 13 is mounted, and holds the turntable 12. .

In such a configuration, when the traverse motor 9 is rotated clockwise or counterclockwise, the rotational force is transmitted to the optical pickup 2 via the drive gear 4, the drive shaft 3, and the nut plate 6, and the optical pickup 2 is rotated. Is the direction of arrow A or the direction of arrow B,
Move in the radial direction of. In addition, the spindle motor 1
When 1 is rotated in a certain direction, the optical disk 13 placed on the turntable 12 also rotates integrally. The rotation of the optical disk 13 and the movement of the optical pickup 2 are performed as described above. When the optical disc 13 is mounted on the turntable 12 and the spindle motor 11 is rotated,
In order to hold the optical disc 13 and the turntable 12 from slipping, clamping is performed by using an attracting action of a magnet (not shown).

[0005] In the traverse mechanism configured as described above, the optical pickup may be dropped, impacted during transportation.
The operation principle for protecting from the influence of vibration and the like will be described below.

FIG. 8A shows that the optical pickup 2 has a central portion F.
And the worm portion 3c of the drive shaft 3 and the nut plate 6
Are fitted, and are in a normal operation state. FIG.
(B) shows a state in which an impact is applied from the outside. The nut plate 6 receives a reaction force from the worm portion 3c of the drive shaft 3 and deforms in the direction of arrow C due to the impact. Is regulated. Therefore, even if an impact is applied, the optical pickup 2 is held at that position without releasing the fitting between the nut plate 6 and the drive shaft 3, and
Protected from the effects of falling, impact, vibration, etc. However, if this configuration is applied in the entire movement range of the optical pickup 2, the drive shaft 3 and the nut plate 6 may be in a state of being engaged in the innermost or outermost position of the optical pickup 2 and may not be able to operate. It is necessary to implement the measures at the same time.

FIG. 8C shows that the optical pickup 2 is located at the innermost or outermost position and the worm 3
c and the projection 6a of the nut plate 6 are fitted, and are in a normal operation state. FIG. 8D shows a state in which the optical pickup 2 is stopped at the innermost or outermost position, but the traverse motor 9 continues to rotate. This is a state in which the fitting between the portion 6a and the worm portion 3c of the drive shaft 3 has been released. At this time, since the outer dimensions D1 and D2 of the small-diameter threaded portions E1 and E2 of the drive shaft 3 are set so that the nut plate 6 does not abut on the stopper 7, the drive shaft 3 idles and the nut plate 6 It does not fall into an inoperable state due to intrusion.

As described above, the conventional traverse mechanism employs a structure capable of holding the optical pickup 2 when the drive shaft 3 and the nut plate 6 are lifted up due to a drop, impact, vibration, or the like. The drive shaft 3 and the nut plate 6 at the innermost circumference or the outermost circumference can be prevented from biting.

[0009]

However, in the above-described conventional traverse mechanism, it is very difficult to form the small-diameter threaded portions E1 and E2 of the drive shaft 3 at both ends.
Even if it can be realized, the cost must be increased, and the sliding guide span with the bearings 2a, 2b of the optical pickup 2 in the small-diameter screw portions E1, E2 becomes small,
There are many problems such as a problem that the moving operation of the optical pickup 2 becomes unstable and an increase in the number of components due to the addition of the stopper 7 and an increase in the number of assembly steps, resulting in poor feasibility.

In view of the above-mentioned conventional problems, the present invention protects an optical pickup in a traverse mechanism from the effects of dropping, impact, vibration and the like during transportation, and traverses the optical pickup at the innermost or outermost position of the optical pickup. A mechanism to prevent the screw and feed nut from biting
It is intended to be easily realized with a reduced number of parts and high reliability.

[0011]

In order to solve the above-mentioned problems, an optical disk drive according to the present invention comprises a stopper for regulating the amount of displacement of a feed nut fitted to a traverse feed screw and the innermost circumference of the optical disk of the optical pickup. The optical pickup is integrally formed on the chassis that constitutes the traverse mechanism except for the outermost position to prevent the fitting and disengagement of the traverse feed screw and feed nut due to the effects of drop, impact, vibration, etc. during transportation. Since the restriction on the amount of displacement of the feed nut is released at the innermost and outermost positions of the optical disc, the traverse feed screw and the feed nut can be prevented from biting.

[0012]

An optical disk drive according to a first aspect of the present invention includes an optical pickup, a traverse feed screw that rotates at a predetermined number of revolutions by driving a traverse motor, and an optical pickup fixed to the optical pickup. A feed nut for moving the optical pickup in the radial direction of the optical disc by fitting with a traverse feed screw,
In the movement range excluding the innermost and outermost positions of the optical disk of the optical pickup, a stopper portion is provided on a chassis constituting a traverse mechanism for preventing the feed nut from being fitted or disengaged from the traverse feed screw. With the above configuration, it is possible to prevent the traverse feed screw and the feed nut from being disengaged and disengaged due to the influence of dropping, impact, vibration, etc. during transportation, and at the innermost and outermost positions of the optical disc of the optical pickup. Since the restriction on the amount of displacement of the feed nut is released, there is an effect that the bite between the traverse feed screw and the feed nut can be prevented.

The optical disk drive of the present invention is a mechanism configured as described above, and protects the optical pickup in the traverse mechanism from the effects of dropping, impact, vibration and the like during transportation, and at the same time as the innermost or innermost circumference of the optical pickup. A mechanism for preventing the traverse feed screw and the feed nut from biting at the outer peripheral position can be easily realized with low cost, a reduced number of parts, and high reliability.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (Embodiment) FIGS. 1 to 4 show a traverse mechanism according to an embodiment of the present invention.

1 to 4, 14 is a traverse chassis, 15 is an optical pickup, 16 is a drive shaft,
Reference numeral 17 denotes a drive gear, reference numeral 18 denotes a thrust spring, reference numeral 19 denotes a nut plate (feed nut). The drive shaft 16 passes through the bearing portions 15a and 15b of the optical pickup 15, and one end 16a is formed on the traverse chassis 14. The other end 16b is rotatably held in the bearing hole 14a, and the other end 16b is press-fitted into the drive gear 17 to hold the drive gear 17, and the shaft 17a of the drive gear 17 is rotatably held by the bearing 14b on the traverse chassis 14. Is held. The guide portion 15c of the optical pickup 15 is engaged with the sub shaft 14c on the traverse chassis 14, and is slidable in the direction of arrow GH. Further, the thrust spring 18 is connected to the traverse chassis 14.
It is press-fitted and held by the upper fixed portion 14d, abuts against the tip portion 17b and the shaft portion 17a of the drive gear 17, and presses the drive shaft 16 through the drive gear 17 in the directions of arrows G and I. The nut plate 19 is a screw 2 for the optical pickup 15.
0 and the projection 1 formed on the nut plate 19
9a is engaged with the worm 16c of the drive shaft 16. 21 is a traverse motor, 22 is a motor gear, and the traverse motor 21 is fixed on the traverse chassis 14, and its rotation shaft 21 a is pressed into the motor gear 22 to hold the motor gear 22. The motor gear 22 meshes with the drive gear 17 and transmits the torque of the traverse motor 21 to the drive shaft 16. Reference numeral 23 denotes a spindle motor and reference numeral 24 denotes a turntable. The spindle motor 23 is fixed on the traverse chassis 14, and is pressed into a turntable 24 on which an optical disk 25 is mounted on its rotation shaft 23a to hold the turntable 24. .

In such a configuration, when the traverse motor 21 is rotated clockwise or counterclockwise, the rotating force is transmitted to the optical pickup 15 via the drive gear 16, the drive shaft 17, and the nut plate 19, and Reference numeral 15 moves in the arrow G direction or the arrow H direction, that is, in the radial direction of the optical disk 25. Further, when the spindle motor 23 is rotated in a certain direction, the optical disk 25 mounted on the turntable 24 also rotates integrally. The rotation of the optical disk 25 and the movement of the optical pickup 15 are performed as described above. The optical disk 25
On the turntable 24 and the spindle motor 23
Is rotated, the optical disk 25 and the turntable 24 are rotated.
Clamping is performed by using an attracting action of a magnet (not shown) or the like in order to hold a slip between them.

In the traverse mechanism configured as described above, when the optical pickup is dropped,
The operation principle for protecting from the influence of vibration and the like will be described below.

FIG. 4A shows the optical pickup in the center, the worm portion 16c of the drive shaft 16 and the nut plate 1
The nine projections 19a are fitted, and are in a normal operation state. FIG. 4B shows a state in which an impact is applied from the outside, and the nut plate 19 causes the worm portion 16 of the drive shaft 16 to be subjected to the impact.
Although it is deformed in the direction of arrow I by receiving a reaction force from c, the amount of deformation is restricted by the contact of the restricting portion 19b integrally formed on the nut plate 19 with the surface of the traverse chassis 14. Therefore, even if an impact is applied, the nut plate 19 and the drive shaft 1
The optical pickup 15 is held at that position without releasing the fitting of the optical pickup 6, and is protected from the effects of dropping, impact, vibration and the like. However, this configuration is used for the optical pickup 15
Optical pickup 1 when applied in the entire moving range of
5 is the drive shaft 16 at the innermost or outermost position.
And the nut plate 19 may be in a state of being caught and become inoperable, and for realization, it is necessary to simultaneously cope with the problem.

FIG. 4C shows that the optical pickup 15 is located at the innermost or outermost position, the worm portion 16c of the drive shaft 16 and the projection 19a of the nut plate 19 are fitted, and the optical pickup 15 is in a normal operation state. FIG. 4D shows a state in which the optical pickup 2 is stopped at the innermost or outermost position but the traverse motor 21 continues to rotate.
Are deformed in the direction of arrow I, and the fitting between the projection 19a and the worm 16c of the drive shaft 16 is released. At this time, since the through-holes 14 e and 14 f are formed in the traverse chassis 14 so that the restricting portion 19 b of the nut plate 19 does not abut on the surface of the traverse chassis 14, the drive shaft 16 idles and the nut plate 19 bites. It does not fall into the inoperable state due to.

As described above, the traverse mechanism according to the embodiment of the present invention employs a configuration in which the optical pickup 15 can be held when the fitting between the drive shaft 16 and the nut plate 19 rises due to drop, impact, vibration, or the like. In addition, the drive shaft 16 and the nut plate 19 at the innermost or outermost periphery of the optical pickup 15 can be prevented from biting.

[0021]

The optical disk drive of the present invention is a mechanism configured as described above, and protects the optical pickup in the traverse mechanism from the effects of dropping, impact, vibration and the like during transportation, and at the same time as the innermost circumference of the optical pickup. Alternatively, it is possible to easily realize a mechanism for preventing the traverse feed screw and the feed nut from biting at the outermost position with low cost, reduced number of parts, and high reliability.

[Brief description of the drawings]

FIG. 1 is a plan view showing a traverse mechanism according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a traverse mechanism according to the embodiment of the present invention.

FIG. 3 is a partial side view showing a traverse mechanism according to the embodiment of the present invention.

FIGS. 4A to 4D are operation principle diagrams showing a traverse mechanism according to the embodiment of the present invention.

FIG. 5 is a plan view showing a conventional traverse mechanism.

FIG. 6 is an exploded perspective view showing a conventional traverse mechanism.

FIG. 7 is a partial side view showing a conventional traverse mechanism.

8 (A) to 8 (D) are operation principle diagrams showing a conventional traverse mechanism.

[Explanation of symbols]

 Reference Signs List 14 traverse chassis 15 optical pickup 16 drive shaft 16c worm portion 19 nut plate 19a protrusion 19b regulating portion 21 traverse motor 23 spindle motor 24 turntable 25 optical disk

Claims (1)

[Claims] An optical pickup, a traverse feed screw that rotates at a predetermined number of revolutions by driving a traverse motor, and a radius fixed to the optical pickup and fitted to the traverse feed screw, thereby making the optical pickup have a radius of an optical disk. A feed nut for moving the feed nut in a direction other than the innermost and outermost positions of the optical disc to prevent the feed nut from being fitted and disengaged from the traverse feed screw on a chassis constituting a traverse mechanism. An optical disk drive device provided with a stopper portion that performs the operation.