JPH06307444A - Linear guide mechanism - Google Patents

Abstract

PURPOSE:To improve inclining accuracy of a bearing in relation to a guide member, and extend a life while suppressing abrasion of the bearing. CONSTITUTION:A spring member 30b is formed on the installing part 30a of a spring 30, and the top end thereof is bent in Z direction so as to form a spring part 30c. The top end of the spring part 30c is bent in Y direction so as to form a fixed part 30d. A bearing 9 is fixed on the fixed part 30d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear guide mechanism used for optical disks, HDDs and the like.

[0002]

2. Description of the Related Art Conventionally, various linear guide mechanisms have been proposed. For example, Japanese Patent Laid-Open No. 61-39271 discloses the following invention. The above invention is shown in FIG.
~ It demonstrates using FIG. 9 is a plan view and FIG.
0 is a left side view and FIG. 11 is a front view.

A carriage 82 on which an optical head 81 is placed.
Is configured to be movable in the X direction in the figure in order to irradiate the disk recording surface with a laser and detect the information light. A pair of rollers 83 and 84 having an outer ring are rotatably provided at one end of the lower surface of the carriage 82, and a similar roller 85 is provided at the other opposite end.

Circular guide rails 88 and 89 are fixed to the support member 86 and the support member 87, respectively, and the guide rail 88 and the guide rail 89 are arranged in parallel. Each of the rollers 8 is attached to the guide rails 88 and 89.
The carriage 82 is guided by the engagement of 3, 84, 85, and the carriage 82 moves straight in the X direction in the drawing.

An operating portion 90 is formed at one end of the carriage 82, and a coil 91 is wound around one end of the operating portion 90 perpendicularly to the axis of the operating portion 90. The coil 91 is inserted into a magnetic gap formed by a yoke 92 and a magnet (not shown), and a current is passed through the coil 91, whereby the carriage 82 is driven in the X direction by electromagnetic force.

Further, the device described in the prior art section of Japanese Patent Laid-Open No. 4-90130 is known. The above device
This will be described with reference to the sectional view of FIG. Optical pickup 93
The carriage 94 on which the roller is mounted has an outer ring of a cylindrical roller 95.
It is movably supported in the front and back directions in FIG. 12 by a to 95f. The rollers 95a to 95f are guide members 96a for guiding the carriage 94 in a linear direction,
It is in contact with 96b, and the guide members 96a and 96b form a magnetic circuit together with the magnets 97a and 97b and the yokes 98a and 98b. The current flowing in the coil 99 formed integrally with the carriage 94 causes the carriage 94 to move linearly in the front-back direction in FIG.

[0007]

However, each of the above-mentioned prior arts has the following drawbacks. That is, JP-A-61
In the invention described in Japanese Patent No. 39271, the inclination θ of each roller 83, 84, 85 supporting the carriage 82 is made the same as the vertical Z direction orthogonal to the X direction which is the guide direction of the guide rails 88, 89. Must be (see Figure 11). When this inclination θ is large, each roller 83,
When the outer rings 84 and 85 roll on the guide rails 88 and 89, a slip in the Z direction occurs, and the rollers 83,
84,85 and the guide rails 88,89 wear more,
The life is shortened. As in the above invention, each roller 83, 8
When the outer wheels 4,85 are in contact with the guide rails 88,89 at two points, it is necessary to improve the accuracy of the inclination θ because the outer wheels at the two points in contact are integral.

Further, in the device as shown in FIG. 12,
When the outer ring is a cylindrical roller and one point of the outer ring contacts the guide rail, there is play of the outer ring with respect to the inner ring, so that the inclination of the roller is larger than that of the roller described in JP-A-4-90130. The allowable amount is large, but there are similar drawbacks.

Therefore, the present invention was developed in view of the drawbacks of the above-mentioned respective prior arts, and the inclination accuracy of the bearing with which the outer ring of the roller contacts at two or more points with respect to the guide member is good,
It is an object of the present invention to provide a linear guide mechanism that can obtain a long life.

[0010]

According to the present invention, there is provided a movable portion, a first bearing and a second bearing fixed to the movable portion, and a first bearing abutting on the base. In a linear guide mechanism having a first guide member and a second guide member that abuts on the second bearing fixed on the base, the second bearing is arranged with respect to the guide direction of the second guide member. And is configured to be rotatable about orthogonal axes.

[0011]

According to the present invention, the inclination accuracy of the bearing with respect to the guide member can be kept excellent.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment, FIG. 1 is a perspective view of an optical disk device, FIG. 2 is a perspective view of a main part, and FIG. 3 is a cross-sectional view of the main part. A spindle motor 3 for rotating an optical disc 2 is fixed on the deck base 1. The movable part 4 is
As will be described later, the deck base 1 is supported so as to be movable in the radial direction (X direction) of the optical disc 2.

A known actuator (not shown) for supporting and driving the objective lens 5 in the X and Z directions is fixed on the carriage 7 inside the movable portion 4, and the actuator surrounds the upper portion of the actuator with a cover 6. Has been done. Two bearings 8 are press-fitted and fixed to the carriage 7 from the Z (-) direction. The two bearings 8 are located on the Y (+) side of the carriage 7 and are spaced apart in the X direction. A bearing 9 is provided on the Y (−) side of the carriage 7 opposite to the bearing 8. The bearing 9 is fixed to the carriage 7 with a screw 31 via a spring 30, as described later.

The outer races of the bearings 8 and 9 are formed in a substantially V-shape. The two bearings 8 are the guide rails 10 and the bearings 9 are the guide rails 11.
And contact each at two points on the outer ring. The guide rail 10 is installed in parallel to the guide rail 11 and in the Z (-) direction, and is configured to apply a preload in the thrust direction to the two bearings 8 and 9 to remove the play.

The guide rail 11 is provided with two salvis 13 so that the reference surfaces 1b and 1c of the fixed portion 1a on the deck base 1 are provided.
It is applied to and positioned and fixed. Similarly, the guide rail 10 is also positioned and fixed on the deck base 1.
The guide rails 10 and 11 and the bearings 8,
The movable portion 4 is supported by 9 and the spring 30 so as to be movable in the X direction without backlash.

Two hollow coils 20 wound in a quadrangular prism shape are fixed to both ends of the movable portion 4 in the Y direction. A center yoke 21 is fixed to the deck base 1 with screws 22 so as to penetrate through the coil 20. The side yoke 24 having a substantially U-shape with the magnet 23 fixed inside is abutted at both ends to the center yoke 21, and is fixed to the deck base 1 with screws 25. And
A magnetic gap is formed by the center yoke 21 and the magnet 23, and a current is passed through the coil 20 to interact with the magnetic field in the magnetic gap to drive the movable portion 4 in the X direction.

A fixed optical system including a laser, a photodetector and the like (not shown) is fixed on the deck base 1. The light emitted from the fixed optical system 26 enters the objective lens 5 through a mirror (not shown) fixed on the movable portion 4 and focuses on the optical disc 2. This reflected light follows the reverse path and returns to the fixed optical system 26 to detect an error.

The essential parts of the apparatus will be described below with reference to FIGS. 2 and 3. The spring 30 is made of a stainless thin leaf spring material, and has a substantially Z shape when viewed from the X direction. The mounting portion 30 a of the spring 30 is fixed to the bottom surface of the carriage 7 with screws 31. A spring portion 30b extending in the Y direction is formed from the mounting portion 30a, and a tip end of the spring portion 30b is bent in the Z direction to form a spring portion 30c extending in the Z direction. Further, the tip of the spring portion 30c is formed with a fixing portion 30d that is bent in the Y direction and extends in the Y direction.

A hole 30e is formed in the fixing portion 30d, and a shaft 9a which is integral with the inner shaft of the bearing 9 is press-fitted and fixed in the hole 30e in the Z (-) direction. Spring 3
From the mounting portion 30a of No. 0, the arm portions 30f project at both sides of the spring portion 30b with a small space therebetween. Arm 30f
A damper 32 is attached to the spring portion 30b so as to surround them.

When the movable part 4 is assembled on the deck base 1 together with the guide rails 10 and 11, the outer ring of the bearing 9 contacts the guide rail 11 at two contact points 33. At this time, the spring portion 30c mainly bends in the Y (+) direction to press the bearing 9 against the guide rail 11 to apply a preload. Further, since the spring portion 30b has a narrow width in the X direction and extends in the Y direction, the rigidity around the Y axis is lower than the rigidity in other directions. In the state of FIG. 3, the perpendicularity of the shaft 9b of the bearing 9 with respect to the guide direction of the guide rail 11, that is, the X-axis, is such that the spring portion 30b is twisted about the Y-axis to allow the guide rail 11 to bear the bearing 9.
The outer ring of the will follow and become good.

Further, the spring portion 30b and the arms 30 on both sides thereof are provided.
Since the damper 32 is attached so as to surround f and f, it is possible to suppress bending vibration in the Z direction and torsional vibration around the Y axis in the spring portion 30b. Therefore, this spring portion 30b
It is possible to suppress unnecessary vibration of the movable portion 4 due to the vibration.

If the damper 32 is also surrounded by the spring portion 30c, the vibration of the spring portion 30c can be further suppressed.

[0023]

[Embodiment] FIG. 4 is a perspective view of an essential portion showing a second embodiment.
The present embodiment has substantially the same configuration as that of the first embodiment, and the same components are designated by the same reference numerals, the description thereof will be omitted, and different points will be described.

The spring 40 is formed in a substantially L-shape having a spring portion 40a and a fixed portion 40b whose tip portion is bent at a right angle. A spring portion 40c having a small dimension in the X direction and a low rigidity around the Y axis is formed between the spring portion 40a and the fixed portion 40b. A fixing portion 40d is formed at the rear end portion of the spring portion 40a, and the fixing portion 40d is fixed to the carriage 7 from the Y direction with a screw 31. On the other hand, a bearing 9 is vertically provided on the fixed portion 40b at the tip of the spring 40.

A spring 40 is attached to the carriage 7 of the movable part by a screw 3.
1 is temporarily fixed, the inclination of the end face of the inner ring of the bearing 9 is measured, and the spring 40 is fixed by adjusting the inclination around the Y axis of the screw 31 in the ψ direction so as to correct this.

The inclination of the bearing 9 can be adjusted with respect to the guide rail, and the inclination accuracy of the bearing 9 can be improved. In addition, since the rotation axis of the spring 40 is located in the Z direction of the contact point between the bearing 9 and the guide rail when viewed from the Y direction, even if the spring 40 is rotated, the height of the contact point between the bearing 9 and the guide rail in the Z direction. The positional deviation is extremely small. Therefore, there is almost no change in the inclination of the movable portion around the X axis at this time. Further, the spring portion 40c is rotationally displaced about the Y axis orthogonal to the guide direction (X direction) of the guide rail, so that the inclination of the bearing 9 is properly aligned with the guide rail.

[0027]

[Embodiment] FIG. 5 is a cross-sectional view of an essential part showing a third embodiment.
The present embodiment has substantially the same configuration as that of the first embodiment, and the same components are designated by the same reference numerals, the description thereof will be omitted, and different points will be described. The bearing 45 has a ball 45c interposed between an inner ring 45a and an outer ring 45b thereof, and the outer ring 45b is rotatably held with respect to the inner ring 45a. One end of a thin linear spring 46 is press-fitted and fixed to the inner ring 45a of the bearing 45. Spring 4
The other end of 6 is press-fitted and fixed to the carriage 7.

When the spring 46 bends in the Y (-) direction, the bearing 45 is pressed against the guide rail to apply a preload. Further, the spring 46 bends in the X direction to correct the inclination of the bearing 45 with respect to the guide rail 11.

Although the linear spring 46 is used in this embodiment, the present invention is not limited to this, and a spring having another shape can be used. Further, an auxiliary spring such as a dogleg shaped spring or a coil spring may be provided at a position facing the spring 46 in the inner ring 45a.

[0030]

[Embodiment] FIG. 6 is a perspective view of a main portion showing a fourth embodiment.
The present embodiment has substantially the same configuration as that of the first embodiment, and the same components will be denoted by the same reference numerals and the description thereof will be omitted, and the different points will be described. The spring 50 is the spring portion 5.
0a extends in the X (+) direction, and the rear end portion is fixed to the fixing portion 50b.
Then, it is fixed to the carriage 7 with screws 31. A tip portion of the extended spring portion 50a is bent into a substantially U-shape to form a holding portion 50c.

A concave portion 50d is formed at the tip of the holding portion 50c, and the shafts 9a protruding from both ends of the bearing 9 are positioned there. The width W of the recess 50d is the axis 9a.
Is formed to be slightly larger than the diameter d. Further, both ends of the recess 50d are holding portions 50e, and four holding portions 50e are provided.
The Z-direction end face of the inner ring 9c of the bearing 9 is pressed by to remove the backlash in the Z-direction of the bearing 9.

With the bearing 9 in contact with the guide rail 11, the spring portion 50a bends in the Y direction to apply a preload.
At the same time, the shaft 9a moves toward the end surface 5 of the recess 50d of the spring 50.
It is pressed against 0f. Bearing 9 is guide rail 1
Since the bearing 9 can be slightly rotated around the Y axis with respect to 1, the bearing 9 follows the guide rail 11.

The width W of the recess 50d may be formed such that one of the upper and lower sides is made smaller so that there is no play with the shaft 9a.

[0034]

[Embodiment] FIG. 7 is a perspective view of a main portion of a fifth embodiment.
The present embodiment has substantially the same configuration as that of the first embodiment, and the same components are designated by the same reference numerals, the description thereof will be omitted, and different points will be described. The shafts 9a at both ends of the bearing 9 are press-fitted and fixed to the groove 55a of the U-shaped holding member 55. On the other hand, a pin 56 is provided on the carriage 7.
Has been press-fitted.

The holding member 55 is formed with a hole 55b through which the central axis of the pin 56 passes through the center of the bearing 9, and the pin 56 is inserted into the hole 55b. The holding member 55 is rotatably supported around the pin 55b. The preload in this case is performed by pushing the guide rail in the Y (+) direction.

[0036]

[Embodiment] FIG. 8 is a perspective view of a main portion of a sixth embodiment.
The present embodiment has substantially the same configuration as that of the first embodiment, and the same components are designated by the same reference numerals, the description thereof will be omitted, and different points will be described. The shaft 9a of the bearing 9 is press-fitted and fixed to the fixed portion 60a on the upper surface of the spring 60 having a substantially U shape. The spring portion 60b on the side surface of the spring 60 bends in the Y (+) direction to apply preload.

A fixing portion 60c at one end of the lower surface of the spring 60 is fixed onto the carriage 7 with a screw 31. End 6 on the opposite side of the lower surface
A screw 61 is inserted into the hole 0d and screwed into the screw hole 7a on the carriage 7. By rotating the screw 61, the end portion 60d is displaced in the Z direction with respect to the fixed portion 60c. That is, the bearing 9 is rotationally adjusted about the Y axis to obtain the inclination accuracy of the bearing 9. The reliability is increased by filling the space between the spring 60 and the carriage 7 with an adhesive after adjusting the inclination.

The present invention is not limited to optical discs, but can be applied to linear guide mechanisms such as HDDs. Further, a part of the plurality of bearings may be formed by sliding bearings instead of rolling bearings. Furthermore, the shape of the outer ring of the bearing is not limited to the V-shape, and cylindrical bearings may be used in combination.

[0039]

As described above, according to the linear guide mechanism of the present invention, the bearing is configured to be rotatable about the axis orthogonal to the guide direction of the guide member, or the bearing is provided in the movable part. Since the inclination is adjusted and fixed, the accuracy of inclination of the bearing with respect to the guide member is good, wear of the bearing can be suppressed, and the life of the bearing can be extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is a perspective view of a main part of the first embodiment.

FIG. 3 is a cross-sectional view of a main part showing the first embodiment.

FIG. 4 is a perspective view of a main part showing a second embodiment.

FIG. 5 is a cross-sectional view of essential parts showing a third embodiment.

FIG. 6 is a perspective view of a main part showing a fourth embodiment.

FIG. 7 is a perspective view of a main part showing a fifth embodiment.

FIG. 8 is a perspective view of a main part showing a sixth embodiment.

FIG. 9 is a plan view showing a conventional example.

FIG. 10 is a left side view showing a conventional example.

FIG. 11 is a front view showing a conventional example.

FIG. 12 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Deck base 2 Optical disc 3 Spindle motor 4 Moving part 7 Carriage 8,9 Bearing 10,11 Guide rail 20 Coil 21 Center yoke 23 Magnet 24 Side yoke

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayasu Kanazawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. A movable part, a first bearing and a second bearing fixed to the movable part, a first guide member that abuts on the first bearing fixed on a base, and a base. A linear guide mechanism having a second guide member abutting against the second bearing fixed to the second bearing, the second bearing being rotated around an axis orthogonal to the guide direction of the second guide member. A linear guide mechanism characterized by being configured as possible.