JPH06302129A - Carriage supporting mechanism for information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the wear of guide rails and rollers even if the pressing force of the rollers is set high. CONSTITUTION:Lubricating oil holding members 23 packed into the hollow parts 21a of the rails 21 are formed of porous materials having the coefft. of thermal expansion higher than the coefft. of thermal expansion of the rails 21 and are previously impregnated with the lubricating oil. Outflow holes 21b are formed at specified intervals in the longitudinal direction of the rails 21. The lubricating oil holding members 23 are lowered in porosity by elevation of the temp. in the device, by which the lubricating oil is discharged to the outflow holes 21b and is supplied to the rail surfaces 21c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in an information recording / reproducing apparatus such as an optical disk drive apparatus or a magneto-optical disk drive apparatus, movably supports a carriage having an optical head for recording / reproducing data on / from a disk or the like. The present invention relates to a carriage supporting mechanism that operates.

[0002]

2. Description of the Related Art FIGS. 7 and 8 are a front sectional view and a plan view of a carriage supporting mechanism disclosed in JP-A-2-278576.

In the figure, two cylindrical guide rails 2a and 2b are attached to a base 5 via a fixing member 12 in parallel with the moving direction of the carriage 1.

The spindle motor 10 is attached to the base 5 and drives the disk 11 to rotate. Rollers 3a to 3d are obliquely attached to one side surface 1a of the carriage 1 in the moving direction so as to sandwich a guide rail 2a from above and below. Further, the roller 3e is provided at the center of the other side surface 1b of the carriage 1.
Is attached so as to contact the upper surface of the guide rail 2b.

On the other hand, the roller 3f contacting the guide rail 2b from the opposite side of the roller 3e sandwiching the guide rail 2b is
In order to generate a pressing force for pressing the carriage 1 in the direction of the guide rail 2a, it is attached to the carriage 1 below the carriage 1 via a leaf spring 4 extending in a direction orthogonal to the moving direction of the carriage.

An optical head 13 is mounted on the upper portion of the carriage 1, and voice coils 6 and 7 as a driving force generating source for accessing the arbitrary track on the disk 11 by the optical head 13 are provided on the left and right sides of the carriage 1. It is attached. Further, magnets 8a, 8b and yokes 9a, 9b for generating a driving force in the voice coils 6, 7 are also attached to the base 5.

[0007]

In the carriage supporting mechanism disclosed in Japanese Patent Laid-Open No. 2-278576, the rollers 3a to 3d rotate on the guide rail 2a when the carriage 1 moves.
The rollers 3e and 3f rotate on the guide rail 2b, and the leaf spring 4 presses the rollers 3a to 3f against the rails 2a and 2b, respectively. By pressing the rollers 3a to 3f against the rails 2a and 2b by the leaf spring 4, yawing of the carriage 1 during movement of the carriage 1 and vibration of the carriage 1 are suppressed. However, in order to sufficiently suppress the yawing and vibration of the carriage 1, it is necessary to set the pressing force of the rollers 3a to 3f against the rails 2a and 2b to be high, and in the state where the pressing force of the rollers 3a to 3f is set to be high, When the carriage 1 is reciprocated at high speed, the rails 2a,
2b or rollers 3a-3f wear. As a result, the frictional force between the rails 2a and 2b and the rollers 3a to 3f changes with time, so that the operation of the carriage 1 becomes unstable and seek errors and tracking servo errors occur during recording and reproduction. It will be easier.

It is an object of the present invention to provide a carriage supporting mechanism for an information recording / reproducing apparatus which can prevent the guide rail and the roller from being worn even when the pressing force of the roller is set high.

[0009]

In order to solve the above-mentioned problems, the first means of the present invention is to dispose in a moving path of a carriage on which an optical head for optically recording / reproducing information is mounted. Carriage for an information recording / reproducing apparatus, which includes a guide rail and a roller that is pivotally supported by the carriage and rolls on the rail surface of the guide rail, and movably supports the carriage along the recording surface of the information recording medium. In the support mechanism, a hollow portion is formed inside the guide rail,
In addition, a lubricating oil is held in the hollow portion, and a lubricating oil holding member for discharging the lubricating oil is filled into an outflow hole communicating with the rail surface from the hollow portion during recording and reproduction.

Further, the second means supports a lubricating oil absorbing member which absorbs lubricating oil, and is externally fitted to the guide rail to absorb the lubricating oil in a non-contact area on the rail surface with the roller. A guide rail cover for contacting the member is provided.

Further, the third means is that the carriage is provided with a roller cover for supporting a lubricating oil absorbing member for absorbing lubricating oil, and for making the lubricating oil absorbing member face the roller surface of the roller. Characterize.

Further, a fourth means is to provide the carriage with a brush-like sliding contact member which slides at least in a region of the rail surface where the roller contacts and a region where the outflow hole is opened when the carriage moves. It is characterized by that.

Further, a fifth means is to support a lubricating oil absorbing member for absorbing lubricating oil on the carriage so that the lubricating oil absorbing member faces the fixed end of the sliding contact member, and at the same time, the lubricating oil is absorbed. A holder member that covers the outer surface of the absorbing member is fixed.

[0014]

According to the first means, the rail surface of the guide rail is constituted by the hollow portion formed inside the guide rail and the lubricating oil holding member which is filled in the hollow portion and flows out the lubricating oil to the outflow hole. Lubricating oil is supplied to and an oil film is formed.

Further, according to the second means, the guide rail cover which supports the lubricating oil absorbing member, is fitted onto the guide rail, and abuts the lubricating oil absorbing member on the non-contact area of the rail surface with the roller. Thus, when the lubricating oil is excessively supplied to the rail surface, the excessive lubricating oil is absorbed from the rail surface.

Further, according to the third means, when the lubricating oil adhering to the roller is scattered by centrifugal force by the roller cover which supports the lubricating oil absorbing member and faces the lubricating oil absorbing member to the roller surface, The scattered lubricating oil is absorbed.

Further, according to the fourth means, the lubricating oil flowing out from the outflow hole is slidably contacted by the sliding contact member which slides at least in the roller contact area and the outflow hole opening area on the rail surface when the carriage moves. While soaking in the member, the sliding contact member evenly applies the lubricating oil to the rail surface.

Further, according to the fifth means, the lubricating oil absorbing member faces the vicinity of the fixed end of the sliding contact member, and the holder member covering the lubricating oil absorbing member permeates the vicinity of the fixed end of the sliding contact member. Excessive lubricating oil is absorbed and retained in the holder member.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In addition, in FIGS. 1 to 6, FIGS.
The members corresponding to the members described on the basis of FIG.

FIG. 1 is a front sectional view showing an essential part of an embodiment of a carriage supporting mechanism of the present invention, and FIG. 2 is an exploded perspective view of a rail with a partially broken section in the present embodiment.

The rail 21 is formed in a pipe shape with a hollow portion 21a penetrating therethrough, and openings at both ends are sealed by lids 22. The hollow portion 21a is filled with a lubricating oil holding member 23 made of porous polyacetal having a thermal expansion coefficient larger than that of the rail 21, and the lubricating oil holding member is formed.
Lubricate 23 beforehand with lubricating oil. The rail 21 is formed with outflow holes 21b communicating with the outside from the hollow portions 21a at a constant pitch in the longitudinal direction. Further, the rail cover 24 fitted on the rail 21 is made of polyacetal or polyethylene.
A lubricating oil absorbing member 25 formed of felt, sponge or the like and having a property of absorbing lubricating oil is attached to the opposing surface of the. The rail cover 24 covers a region of the rail surface 21c where the rollers 3a to 3f do not contact, and the lubricating oil absorbing member 25 is brought into contact with the rail surface 21c.

The carriage 1 has rollers 3a ...
A roller cover 26 is arranged to face the roller surface 3g of 3f.

FIG. 3 is a sectional view of the roller cover taken along the line AA in FIG.

The roller cover 26 covers the roller surface 3g except near the contact position with the rail surface 21c, and a lubricating oil absorbing member 27 that absorbs lubricating oil is attached to the surface facing the rollers 3a to 3f.

At the time of recording / reproducing, inside the apparatus, the ambient temperature rises due to the heat generated from the spindle motor 10, the voice coils 6, 7 and the like. The lubricating oil holding member 23, which has a higher coefficient of thermal expansion than the rail 21 and is soaked with lubricating oil, has a reduced porosity due to a rise in temperature and supplies the lubricating oil to the outflow holes 21b. The lubricating oil supplied to the outflow hole 21b flows out to the rail surface 21c,
Further, it spreads along the rail surface 21c to form an oil film.
By forming an oil film on the rail surface 21c with the lubricating oil, the rollers 3a to 3f roll on the rail surface 21c via the oil film. Therefore, even when the pressing force of the rollers 3a to 3f on the rail 21 is set high, It is possible to prevent the rail surface 21c of the rail 21 and the roller surfaces 3g of the rollers 3a to 3f from being worn. Further, when the lubricating oil is excessively supplied from the lubricating oil holding member 23 to the rail surface 21c, the excessive lubricating oil is absorbed by the lubricating oil absorbing member 25 of the rail cover 24 or adheres to the roller surface 3g. The lubricating oil attached to the roller surface 3g is scattered from the roller surface 3g by the centrifugal force and is absorbed by the lubricating oil absorbing member 27 of the roller cover 26. The lubricating oil absorbed by the lubricating oil absorbing members 25 and 27 is held in the rail cover 24 and the roller cover 26, and is prevented from dripping or seeping into the carriage 1. As a result, it is possible to prevent a member such as an optical component inside the apparatus from being contaminated with the lubricating oil, or the lubricating oil from being attached to the electrical component or the like to short-circuit the electrical component or the like.

4 and 5 are a perspective view and a side sectional view showing a sliding contact brush and its holder in this embodiment.

On one side surface 1a of the carriage 1, a sliding contact brush 32 which is in contact with the holder 31 and the rail 21 is arranged. In the case-shaped holder 31, a window 31a is opened on the surface facing the rail 21, and the sliding contact brush 3 planted on the inner surface of the holder 31.
2 projects from the window 31a. Further, in the holder 31, the lubricating oil absorbing member 33 is wrapped so as to wrap around the fixed end of the sliding contact brush 32.
Is filled.

The sliding contact brush 32 slides on the rail surface 21c of the rail 21 as the carriage 1 moves, and when sliding, a plurality of outflow holes 2 are formed on the rail surface 21c as shown in the explanatory view of FIG.
The vicinity of the tip end is brought into contact with the region including the opening of 1b and the tangent line C to the rollers 3a to 3d. The lubricating oil flowing out from the outflow hole 21b permeates the sliding contact brush 32, and the sliding contact brush 32
Applies the lubricating oil uniformly to the rail surface 21c when the carriage 1 moves. As a result, an oil film is efficiently formed near the tangent line C on the rail surface 21c, and even if the amount of lubricating oil that has flowed out from the outflow hole 21b is small, it is ensured that the rollers 3a to 3d roll on the rail surface 21c. An oil film can be formed on the surface, and when foreign matter such as dust adheres to this area, the foreign matter can be removed. Further, when excessive lubricating oil permeates the sliding contact brush 32, the lubricating oil permeates to the fixed end side of the sliding contact brush 32, is absorbed by the lubricating oil absorbing member 33, and is retained in the holder 31. . This prevents the lubricating oil from dripping from the sliding brush 32 and permeating into the carriage 1.

Further, a holder 31 and a sliding contact brush 32 are also arranged on the other side surface 1b of the carriage 1 so that the rail surface
In 21c, the oil film of the lubricating oil is efficiently formed in the region where the rollers 3e and 3f roll.

[0030]

As described above, according to the first means of the present invention, the lubricating oil is supplied to the rail surface of the guide rail to form the oil film, so that the roller forms the oil film of the lubricating oil. Since the rail surface rolls through the roller surface, it is possible to prevent the roller and the guide rail from being worn even when the pressing force of the roller on the rail surface is set high.

Further, according to the second means, when the lubricating oil is excessively supplied to the rail surface, the excessive lubricating oil is absorbed from the rail surface, so that the lubricating oil is scattered from the guide rail into the inside of the apparatus. As a result, it is possible to prevent problems such as deterioration of performance due to contamination of the optical component with lubricating oil and occurrence of short circuit of the lubricating oil.

Further, according to the third means, when the lubricating oil adhered to the roller is scattered by centrifugal force, the scattered lubricating oil is absorbed, and the lubricating oil scattered from the roller stains the inside of the apparatus. Since this can be prevented, it is possible to prevent the lubricating oil from causing a problem.

Further, according to the fourth means, the lubricating oil flowing out from the outflow hole permeates the sliding contact member, and the sliding contact member uniformly applies the lubricating oil to the rail surface, so that the roller on the rail surface is prevented. Since the lubricating oil can be efficiently applied to the contact area, even if the amount of the lubricating oil flowing out from the outlet is small, the oil film of the lubricating oil can be reliably formed on the area of the rail surface where the roller contacts.

Further, according to the fifth means, the excess lubricating oil that has permeated near the fixed end of the sliding contact member is absorbed and held in the holder member, so that the lubricating oil is scattered from the sliding contact member. It is possible to prevent the lubricating oil from being transmitted to the carriage from the sliding contact member.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a main part of a carriage supporting mechanism according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a rail with a partially broken surface in this embodiment.

3 is a sectional view of the roller cover taken along the line AA of FIG.

FIG. 4 is a perspective view of a sliding contact brush and its holder in the present embodiment.

FIG. 5 is a side sectional view of the sliding contact brush and its holder in the present embodiment.

FIG. 6 is an explanatory diagram of a contact state between a rail surface and a sliding contact brush in the present embodiment.

FIG. 7 is a front sectional view of a carriage support mechanism disclosed in Japanese Patent Laid-Open No. 2-278576.

8 is a plan view of the carriage support mechanism shown in FIG.

[Explanation of symbols]

1 ... Carriage, 3a-3f ... Rollers, 21 ... Rails,
21b ... Outflow hole, 23, 33 ... Lubrication holding member, 24 ... Rail cover, 25, 27 ... Lubricating oil absorbing member, 26 ... Roller cover, 31 ... Holder, 32 ... Sliding brush.

Claims (5)

[Claims] 1. A guide rail disposed in a moving path of a carriage on which an optical head for optically recording / reproducing information is mounted, and a rail surface of the guide rail which is pivotally supported by the carriage. A carriage supporting mechanism of an information recording / reproducing apparatus, which comprises a moving roller and supports a carriage movably along a recording surface of an information recording medium,
A hollow portion is formed inside the guide rail, and a lubricating oil is held in the hollow portion, and a lubricating oil holding member for discharging the lubricating oil is filled into an outflow hole communicating with the rail surface from the hollow portion during recording and reproduction. A carriage supporting mechanism of an information recording / reproducing apparatus characterized in that. 2. A guide that supports a lubricating oil absorbing member that absorbs lubricating oil, and that is externally fitted to the guide rail to bring the lubricating oil absorbing member into contact with a non-contact region of the rail surface with the roller. The carriage support mechanism of the information recording / reproducing apparatus according to claim 1, further comprising a rail cover. 3. A roller cover is provided on the carriage, the roller cover supporting a lubricating oil absorbing member that absorbs lubricating oil, and the roller surface of the roller facing the lubricating oil absorbing member. Alternatively, the carriage supporting mechanism of the information recording / reproducing apparatus described in 2. 4. The brush is provided with a brush-shaped sliding contact member that slides at least in a region of the rail surface where the roller contacts and a region where the outflow hole is opened when the carriage moves. Claims 1 and 2
Alternatively, the carriage support mechanism of the information recording / reproducing apparatus described in 3. 5. A lubricating oil absorbing member that absorbs lubricating oil is supported on the carriage, the lubricating oil absorbing member faces the fixed end of the sliding contact member, and the outer surface of the lubricating oil absorbing member is covered. The carriage support mechanism of the information recording / reproducing apparatus according to claim 4, wherein a holder member is fixedly attached.