JPH11185405A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the performance of a slide guide which moves and guides an optical pickup device and to reduce the cost of the slide guide. SOLUTION: A slide guide 1 which is formed on a chassis 11 and in which a subguide 25 of an optical pickup device is brought into sliding contact and supported is formed in such a way that adhesive materials 3, 3 are provided on both end parts on the rear side of a smooth thin plate 2 which is longer than the movement range of the optical pickup device, that recessed parts 4, 4 are formed in the chassis 11 so as to correspond to the adhesive materials 3, 3, that the smooth thin plate 2 is bonded to the recessed parts 4, 4 by the adhesive materials 3, 3 and that the smooth thin plate 2 is overlapped directly with the rear of the chassis 11 between their bonded parts so as to come into close contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for recording and / or reproducing an optical disk as a disk-shaped recording medium such as an optical disk and a magneto-optical disk, and more particularly to a moving guide of the optical pickup device.

[0002]

2. Description of the Related Art As shown in FIG. 5 and FIG.
A disk rotation drive mechanism 14 including a disk drive 2 and a disk table 13, an optical pickup device 15, and a pickup feed device 16 are provided. The chassis 11 is a so-called loading chassis, and is attached to a frame (not shown) of the disc player device via a damper.

As shown in FIGS. 5 and 6, the spindle motor 12 is mounted on the chassis 11 at one end. The spindle motor 12 has a drive shaft 12 a projecting upward from the chassis 11 perpendicular to the main surface of the chassis 11. This drive shaft 12
The base end portion a is supported by a bearing (not shown) disposed on the chassis 11. This drive shaft 12
A disk table 13 is attached to the front end of the disk table 13a. The disk table 13 is formed in a substantially disk shape, and has a truncated cone-shaped centering projection 13 at the center of the upper surface.
a is provided. When the central portion of the optical disk 101 is placed on the disk table 13, the centering projection 13a is fitted into the chucking hole 101a to perform centering (alignment) of the optical disk 101, and the peripheral edge of the optical disk 101 is positioned at the periphery. The peripheral portion of the chucking hole 101a is placed on the upper surface of the flange portion, and the optical disc 101 is positioned and held. At this time, the optical disk 101 is held by the disk table 13 with the disk substrate side facing the chassis 11 side.

When the spindle motor 12 is rotated while the optical disk 101 is held on the disk table 13, the optical disk 101 is rotated.
Is rotated with the disk table 13. Further, the disk table 13 is immersed below the disk tray integrally with the chassis 11 by moving the chassis 11 downward, and in this state, the optical disk 101 on the disk table 13 is placed on the disk tray. Then, the disc can be taken out by pulling out the disc tray.

In the optical pickup device 15, an objective lens 21 can be moved in the optical axis direction (focus direction) and the direction orthogonal to the optical axis (tracking direction) by a biaxial actuator 22 on the upper surface side of a housing-like slide base 20. It is supported by. In addition, the slide base 2
0, that is, a housing portion 20a contains an optical unit including a semiconductor laser as a light source, a beam splitter, a photoelectric conversion element for receiving and detecting a reflected light beam from an optical disk, and the like. 21.

The optical pickup device 15
The optical disk 101 is rotated on the chassis 11 by the disk rotation drive mechanism 14.
Are movably supported in the radial direction. That is, a support hole 20b is provided below one side of the slide base portion 20 through which a guide shaft 17 which is laterally extended in the direction of the disk rotation drive mechanism 14 on one side edge of an opening 11a of the chassis 11 is inserted. A rack gear 24 having a backlash correction mechanism 23 is provided on the upper side of one side in parallel with the guide shaft 17.
4 is meshed with a pinion gear of the pickup feeding device 16, which will be described later. By this drive, the optical pickup device 15 moves the optical disc 1 along the guide shaft 17.
01 can be moved in the radial direction.

Further, the optical pickup device 15
A guide groove 25 as a sub-guide is provided on the other side of the slide base 20, and a resin plate fixed to the other side of the opening 11 a of the chassis 11 by screws 18 in parallel with the guide shaft 17. Slide guide 19
The objective lens 21 is supported so that the optical axis of the objective lens 21 is perpendicular to the chassis 11.

An actuator cover 26 that covers a biaxial actuator 22 that supports the objective lens 21 is fitted on the upper surface of the slide base 20. The objective lens 21 is mounted on the upper surface of the cover 26. A window hole 26a is provided so that the light beam emitted from the objective lens 21 is emitted outward.

A pickup feeder 16 for moving the optical pickup device 15 on the chassis 11 is constructed by connecting a spur gear transmission mechanism to a feed motor 30 which is a driving source of the pickup feeder 16. Have been. That is, the drive gear 32 is attached to the drive shaft 31 of the feed motor 30. The drive gear 32 is meshed with an idle gear 33 rotatably supported by the chassis 11. A small gear 34 is coaxially fixed to the idle gear 33, and the small gear 34 is meshed with a driven gear 35 rotatably supported by the chassis 11. This driven gear 3
5, a pinion gear 36 is mounted coaxially. The pinion gear 36 is meshed with a rack gear 24 formed on one side edge of the slide base 20 of the optical pickup device 15.

When the feed motor 30 of the pickup feed device 16 having the above configuration is driven to rotate, the optical pickup device 15 is moved along the guide shaft 17 and the sub-guide 19. By moving the optical pickup device 15 in this manner, the optical pickup device 15
The moving operation is performed over the inner and outer circumferences of the optical disc 101 held thereon. In this disk drive device 10,
The optical pickup device 15 can be moved to the outside of a lead-out position that deviates from the signal recording area of the optical disc 101.

When the optical disc 101 is rotated by the spindle motor 12, the optical pickup device 15 reads information signals recorded along the recording tracks of the optical disc 101 along the recording tracks.

When the optical disc 101 is rotated, the recording track is eccentric with respect to the rotation center of the recording track (the center axis of the drive shaft 12a of the spindle motor 12). As a result, at the reading position by the optical pickup device 15, the optical disk 101 periodically reciprocates in the radial direction. Also, this optical disc 101
When the is rotated, the signal recording surface periodically changes in a direction perpendicular to the signal recording surface at the reading position by the optical pickup device 15 due to distortion (error in flatness) of the disk substrate of the optical disk 101. Reciprocate to.

In order to cope with such eccentricity and so-called surface runout in the optical disk 101, the optical pickup device 15 includes the two-axis actuator 22 as an objective lens driving unit as shown in FIG. . The biaxial actuator 22 is connected to the objective lens 2.
1 is the optical axis direction of this objective lens 21 (focus direction)
The optical disc 101 is movably supported in a direction perpendicular to the optical axis (a radial direction of the optical disc 101, a tracking direction).

As described above, the two-axis actuator 22
When the objective lens 21 is moved, the focal point of the light beam on the signal recording layer 102 of the optical disk 101 by the objective lens 21 follows the periodic movement of the recording track, and is always It will be formed on the recording track.

[0015]

In the disk drive device 10 configured as described above, the guide portion for moving and guiding the optical pickup device 15 is provided on both sides of the opening 11a of the chassis 11 with the guide shaft 17 and the slide guide 19. The slide guide 19 is made of a resin plate, and is fixed to the surface of the side edge of the opening 11a of the chassis 11 by tightening with a screw 18. Deformation of the slide guide 19 itself,
Further, the flatness of the slide surface may be deteriorated due to the stress at the time of tightening and fixing the slide guide 19 with the screw 18. Alternatively, there is a risk that reproduction will be hindered.

Further, the mounting of the slide guide 19 requires a lot of trouble, and the number of components increases, which increases the cost.

Further, as a slide guide, there is a slide guide formed by outsert molding using a resin material on a chassis. In this molding, a distortion due to heat shrinkage is generated. It is necessary to form a distortion prevention part, which requires time and effort to process the chassis, which increases the cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an optical pickup device which simplifies the structure of a slide guide and ensures flatness of a slide surface.

[0019]

According to the present invention, there is provided an optical disk which is guided by a guide shaft and a slide guide disposed on a chassis and is moved in parallel to a signal recording surface of an optical disk. In the pick-up device, the slide guide is formed on the chassis by bonding a lubricating thin plate with an adhesive, and the sub-guide of the optical pick-up device is slidably supported.

In the above structure, a double-sided adhesive sheet is used as the adhesive.

In the above configuration, the slide guide is formed by bonding the thin thin plate on the chassis outside the sliding movement range of the sub-guide of the optical pickup device with the adhesive.

Further, in this configuration, a concave portion is formed in the chassis corresponding to the adhesive portion of the lubricating thin plate with the adhesive, the adhesive is adhered to the concave portion, and the lubricating thin plate is bonded with the adhesive. The slide guide is formed by being adhered in a state of being directly superimposed on the chassis surface.

Since the slide guide for guiding the movement of the optical pickup device is formed by bonding a slippery thin plate to the chassis with an adhesive, the number of components is small, the mounting is simple, and the cost can be reduced. At the same time, no stress is generated in the slide guide, the flatness is ensured, the sliding performance is improved, and the optical pickup device is always stably and smoothly guided and moved.

[0024]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

In this embodiment, an optical pickup device provided in a disk drive of an optical disk can be guided and moved stably and smoothly.

FIG. 1 is a plan view of a disk drive device. The disk drive device 10 has substantially the same configuration as the disk drive device shown in FIG. 5 described above. The description is omitted here.

Disk drive 1 according to this embodiment
Reference numeral 0 denotes a configuration in which the configuration of the slide guide is completely different from that of the disk drive device shown in FIG.

That is, the disk drive 10
As shown in FIG. 3 and FIG. 4, the slide guide 1 is a thin resin plate, for example, a back surface of a rectangular thin plate 2 formed of a polyester-based sheet having high abrasion resistance and having lubricity. Adhesives 3 and 3 made of, for example, a double-sided adhesive sheet are adhered to both side ends, and the slip thin plate 2 is connected to the guide shaft 17 on one side edge side of the opening 11 a of the chassis 11 via the adhesives 3 and 3. And is adhered to the surface side of the other side edge portion opposite to.

The length of the sliding thin plate 2 of the slide guide 1 is formed to be longer than the moving range of the optical pickup device 15.
A double-sided adhesive sheet piece as the adhesive material 3 is attached. On the other hand, in the chassis 11, on the surface side of the other side edge of the opening 11 a, the adhesives 3, 3 which are located outside the moving range of the optical pickup device 15 and are adhered to the slippery thin plate 2.
The concave portions 4 and 4 are formed correspondingly, and at least a part surface between the concave portions 4 and 4 on the surface of the chassis 11 is formed as an uneven flat surface 11b having high flatness.

The chassis 11 thus formed is
The above-mentioned lubricating thin plate 2 is provided on the surface side of the other side edge of the opening 11a.
And the adhesives 3 and 3 attached to both ends thereof are recessed 4 and 4
It is bonded and fixed by bonding in a fitting manner. By fixing the slippery plate 2 to the chassis 11, the slippery plate 2 has an inner surface between the bonding portions of the adhesives 3 and 3 in close contact with the uneven plane 11b between the recesses 4 and 4 on the front side of the chassis 11. And the slide guide 1 is formed.

As described above, the slide guide 1 formed on the chassis 11 is fixed by bonding the slippery thin plate 2 to the front surface side of the chassis 11 with the adhesives 3, 3. Also, the slipping thin plate 2 is closely overlapped between the bonding portions, that is, the portion where the sub-guide 25 which is the moving range of the optical pickup device 15 is in sliding contact with the uneven plane 11b of the chassis 11 directly. Therefore, the flatness increases.

Therefore, in the optical pickup device 15, the sub-guide 25 is slidably contacted linearly, is moved stably without rattling or swinging, and the optical axis of the objective lens 21 is set on the signal recording surface of the optical disk 101. The recording and / or reproduction of the optical disk 101 is reliably performed while the optical disk 101 is always held so as to correspond to the vertical direction.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment,
Various changes can be made without departing from the spirit of the present invention.

For example, in this embodiment, a double-sided adhesive sheet is used as the adhesives 3 for bonding and fixing the slippery plate 2 forming the slide guide 1 to the chassis 11, but this double-sided adhesive sheet is used instead. An adhesive may be used. In this case, the adhesive is applied to a predetermined surface of the back surface of the slip thin plate 2, and in this embodiment, to both end surfaces of the back surface of the slip thin plate 2. To form an adhesive portion.

Further, in this embodiment, the adhesives 3 are provided at both ends of the back surface of the lubricating thin plate 2.
The adhesive 3 may be disposed on the front surface of the back surface of the substrate. In this case, as the adhesive 3, a double-sided adhesive sheet or an adhesive can be used.

When the adhesive 3 is provided on the entire back surface of the slippery plate 2 as described above, it is preferable to form the slippery plate 2 thicker than in the case described above. This is because when the slippery plate 2 is thin, the adhesive 3 causes elasticity on the surface side of the slippery plate 2, and when the optical pickup device 15 slides, the sub-guide 25 slides. There is a possibility that a problem such as an increase in resistance may occur, and this is to avoid this.

The constructions of the optical pickup device 15, the pickup feed device 16 and the like in this embodiment are not limited to those shown in the drawings. For example, the pickup feed device 16 has a guide shaft 17 formed on a screw shaft. The screw shaft may be screwed into the slide base of the optical pickup device 15 and the optical pickup device 15 may be moved by driving the screw shaft to rotate forward and reverse. May be configured to be entirely flat.

The optical pickup device according to the present invention can constitute an optical magnetic head mechanism in a recording / reproducing apparatus for a recordable / reproducible magneto-optical disk in combination with a magnetic head apparatus as an overwrite head.

[0039]

As described above, in the optical pickup device according to the present invention, a slide guide is formed by bonding a slippery thin plate on a chassis with an adhesive, and a sub-guide is slidably supported by the slide guide and moved. With such a configuration, the flatness of the slide guide is assured to the slippery thin plate without generating stress at the time of the thin plate itself and at the time of bonding and fixing, and the optical pickup device is not likely to rattle or swing. In addition, the optical disk is always moved stably, and recording and / or reproduction on the optical disk is reliably performed, and the reliability is improved.

Further, since the slide guide is composed of a slippery thin plate and an adhesive, the number of components is reduced, and the fixing to the chassis can be performed very easily without any trouble in the operation, and the cost can be reduced. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a disk drive device using an optical pickup device according to the present invention.

FIG. 2 is a cross-sectional view of the disk drive device shown in FIG.

FIG. 3 is an enlarged sectional view of a slide guide section of the disk drive device shown in FIG.

FIG. 4 is an exploded perspective view of the slide guide section shown in FIG.

FIG. 5 is a plan view of a conventional disk drive device.

FIG. 6 is a cross-sectional view of the disk drive device shown in FIG.

[Explanation of symbols]

1 slide guide, 2 slip thin plate, 3, 3 adhesive, 4, 4 concave, 11 chassis, 14 disk rotation mechanism, 15 optical pickup device, 16
‥‥ Pickup feeder, 17 ‥‥ guide shaft, 20 ‥
{Slide base, 25} Sub guide, 101} Optical disk

Claims (4)

[Claims] 1. An optical pickup device which is guided by a guide shaft and a slide guide disposed on a chassis and is moved in parallel with a signal recording surface of an optical disc, wherein the slide guide is provided on the chassis by a thin thin plate. The optical pickup device is formed by adhering with a bonding material and slidingly supporting a sub-guide of the optical pickup device. 2. The optical pickup device according to claim 1, wherein a double-sided adhesive sheet is used as the adhesive. 3. The optical pickup device according to claim 1, wherein the thin slide plate is adhered to the chassis by the adhesive outside a sliding movement range of a sub-guide of the optical pickup device on the chassis. An optical pickup device characterized by forming: 4. The optical pickup device according to claim 3, wherein a concave portion is formed in the chassis corresponding to a bonding portion of the slip thin plate with the bonding material, and the bonding material is bonded to the concave portion. An optical pickup device, wherein the slide guide is formed by adhering the thin lubricating plate directly on the chassis surface.