JPH08171737A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE: To prevent the sticking of dust on an objective lens face and the infiltration of the dust into a moving section by providing the upstream side of air flow flowing toward the moving section with an air cleaning means and generating the clean and smooth air flow across the inside and outside of the moving section. CONSTITUTION: A negative pressure is generated on the outer side of a cover 46 by the air flow S6 near an opening 46c for the air flow of a cover 46 and, therefore, the air on the inner side of the cover 46 is sucked out and the air flow like an arrow S7 is generated. The air-component made to flow out by the air flow of this arrow S7 is replenished by the clean air flowing via a filter 92 as shown by an arrow S5 as the other parts are hermetically closed. The air flowing out of an opening 46c for the air flow in an arrow S7 direction is made into the clean air from which the dust is removed by the filter 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording / reproducing information on, for example, a compact disc or a magneto-optical disc.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-192537 (hereinafter referred to as "prior art"), an opening other than an opening for emitting laser light is provided in a movable portion of an optical head. A device having a filter attached to this opening is known.

As shown in FIG. 8 (a), a laser beam emitted from a fixed optical system (not shown) is applied to a recording medium such as a compact disc or a magneto-optical disc in a movable portion applied to a conventional device. 2 (see FIG. 8B), a carriage 6 having an objective lens 4 capable of condensing light at a predetermined portion on the carriage 2 and capable of re-capturing reflected light reflected from the recording medium 2; A cover 12 that is attachable and has a filter 10 on a filter opening 8b other than the exit light opening 8a of the objective lens 4 is provided.

With such a structure, when the recording medium 2 arranged close to the upper portion of the cover 12 rotates, a forced air flow S1 is generated around the movable portion. At this time, the pressure in the area between the cover 12 and the recording medium 2 is reduced, so that the air in the movable portion is sucked out from the exit light opening 8a. As a result, a negative pressure is generated in the movable part, so that an air flow S2 is generated from the filter opening 8b toward the inside of the movable part.
Since the filter 10 is provided in the filter opening 8b, only clean air from which dust has been removed by the filter 10 is taken into the movable portion.

[0005]

However, in the conventional apparatus, the objective lens 4 is caused by the rotation of the recording medium 2.
No consideration is given to the air flow over the upper surface of the. That is, as shown in FIG. 8B, on the surface of the objective lens 4 positioned in the exit light opening 8a of the cover 12 on the recording medium 2 side, the dust carried from the outside of the cover 12 by the air flow S1. Since the airflow S3 containing the air directly hits, there is a problem that dust easily adheres to the surface.
Furthermore, when the air flow S3 containing such dust collides with the side surface of the exit light opening 8a, it becomes a turbulent flow and not only hits the surface of the objective lens 4, but also the exit light opening 8a.
There is also a problem that dust will adhere to the inside of the movable portion and the back surface of the objective lens 4 by flowing into the cover 12 via a.

The present invention has been made to solve such a problem, and an object thereof is to generate a clean and smooth air flow over the inside and outside of a movable part, thereby adhering dust to the surface of an objective lens. Another object of the present invention is to provide an information recording / reproducing device capable of preventing dust from entering the movable part.

[0007]

In order to achieve such an object, the information recording / reproducing apparatus of the present invention comprises an objective lens for converging a laser beam emitted from a light source to a predetermined portion on a recording medium. A light detecting element for receiving reflected light reflected from the recording medium, a light source, an objective lens, a movable part for moving at least the objective lens of an optical head having the light detecting element in a radial direction of the recording medium, and an objective The lens includes a first opening provided at a position facing the lens, and an air cleaning unit provided on the upstream side of the air flow flowing toward the movable portion.

[0008]

According to the present invention, the air cleaning means cleans the air flowing toward the movable part.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information recording / reproducing apparatus according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the configuration of the main part of the information recording / reproducing apparatus of this embodiment.

As shown in FIG. 1, the information recording / reproducing apparatus according to the present embodiment has a disk 1 arranged in a cartridge 14.
A spindle motor 18 that rotates with 6 mounted,
The disk 16 is provided with an optical head for irradiating a recording or reproducing laser beam.

The optical head has a fixed optical system 20 containing a semiconductor laser and a detection optical system (both not shown), and a laser beam emitted from the fixed optical system 20.
6, an objective lens 34 for condensing light onto a predetermined portion of the lens 6, a precise actuator 36 (see FIG. 2), and the like, and a movable portion 24.

The fixed optical system 20 is provided on the outer peripheral side of the disk of the base 26, while the movable portion 24 is movable in the radial direction of the disk 16 via a guide rail 28 provided on the base 26. The air core coil 40 (see FIG. 2) that is supported and the magnetic circuit 52 (see FIG. 3) fixed on the base 26 interact with each other to obtain thrust and move.

Next, the structure of the movable portion 24 will be described in detail with reference to FIG. As shown in FIG.
Is a base of the movable part 24, a carriage 30 formed of a plastic molded part, and a fixed optical system 20.
The laser light emitted from the disk 16 (see FIG. 1)
A mirror 32 that reflects in a direction, and an objective lens 34 that is arranged so as to face a recording surface (not shown) of the disk 16 and that focuses the laser light reflected from the mirror 32 on the recording surface.
A fine actuator 36 for positioning the objective lens 34 at a predetermined position, a position detection sensor 38 for detecting a position shift of the objective lens 34 with respect to the predetermined position, an air core coil 40 for generating a thrust for moving the movable part 24, and a movable part. Two
FPC (flexible printed circuit) 42 that energizes 4
And a ferromagnetic preload member 44 for generating a preload for suppressing rattling, that is, fluctuation of the movable portion 24 within an allowable range.
And a cover 46 and the like.

The carriage 30 is made of a resin having good slidability or a resin such as epoxy or PPS (polyphenyl sulfide) added with carbon fiber or Teflon for improving slidability. 2 so that a pair of supporting guide rails 28 (see FIG. 3) are inserted.
The bearing portions 30a and 30b at the places are integrally formed.

Such a carriage 30 has a direction (hereinafter, Y) parallel to a track (not shown) of the disk 16.
On both sides of the copper wire, copper clad aluminum wire,
An air-core coil 40 formed by winding a wire material such as an aluminum wire is adhered, and a magnetic circuit 52 provided on the fixed side (see FIG. 3).
(See reference) generates a thrust force that moves the movable portion 24.

A ferromagnetic preload member 44 is adhered to the carriage 30 and attracts the magnet 54 (see FIG. 3) of the magnetic circuit 52 to move the movable portion 24 to minus Z.
By urging in the direction, a preload for preventing rattling of the movable portion 24 acts.

The preload member 44 is formed by cutting a surface-treated steel wire, for example, and is fitted into a groove having a width 30h slightly smaller than the diameter of the steel wire provided on the carriage 30 and temporarily fixed. After that, it is bonded to the carriage 30 together with the air-core coil 40.

A fine actuator 36 for positioning the objective lens 34 at a predetermined position is provided on the disk 16 side of the carriage 30, and the fine actuator 36 holds the objective lens 34.
4a, four spring members 34b for movably supporting the lens holder portion 34a in at least one of the optical axis direction and the tracking direction of the objective lens 34, and a coil portion 34c for generating a moving thrust. There is.

The lens holder portion 34a includes a coil portion 34.
A focus coil 48a and a tracking coil 48b for forming c are fixed, and a magnet 48d is fixed to the base 48c. According to such a configuration, the objective lens 34 is driven in the focus direction (Z direction) or the tracking direction (X direction) with respect to the base 48c by applying a predetermined current to the focus coil 48a or the tracking coil 48b. Is possible.

A position detecting sensor 38 for detecting the position of the objective lens 34 is attached to the fine actuator 36. On the other hand, the carriage 30 and the precise actuator 36 are elastic members (for example, leaf springs) attached to the precise actuator 36 via fixing screws 56.
By engaging 58 with the engaging projection 30c provided on the carriage 30 and fastening the two screws 60,
Are connected to each other.

The elastic member 58 engaged with the engaging projection 30c of the carriage 30 urges the fine actuator 36 to one side, and from the bottom surface of the fine actuator 36 with respect to the conical surface 30d of the carriage 30. Protruding protrusion 36
Since “a” is arranged in contact, the relative inclination angle between the fine actuator 36 and the carriage 30 can be adjusted in the X direction or the Y direction by changing the tightening amount of the two screws 60. Is configured.

The fine actuator 36 and the carriage 30 are fixed to each other after the two screws 60 are tightened to properly adjust the inclination of the objective lens 34 mounted on the fine actuator 36. .

The cover 46, which covers the fine actuator 36 and the position detecting sensor 38, is made of an ultraviolet ray transmitting member such as polycarbonate.
For this reason, when an ultraviolet curable adhesive is used, ultraviolet rays can be applied from the outside of the cover 46 to cure the adhesive, and therefore the precise actuator 36 and the carriage 30 are bonded and fixed even after the cover 46 is attached. be able to.

A claw (not shown) is provided on the inside of the cover 46 so that when the cover 46 is mounted on the carriage 30, the claw is engaged with a groove 30e formed in the carriage 30. Is configured. In order to prevent dust from entering the carriage 30, the edge portion of the cover 46 is formed so as to fit the wall-shaped portion 30f of the carriage 30 over the entire circumference thereof.
Further, in order to completely prevent the intrusion of dust, the cover 46
The portion where the carriage 30 and the carriage 30 abut may be filled with an adhesive or a sealant.

Further, on the upper surface of the cover 46, a first opening, that is, an opening 46a through which the laser light emitted from the objective lens 34 passes, and an air cleaning means are formed on the plus Y direction side of the opening 46a in the figure. A third opening, that is, an air flow opening 46c is formed. And these openings 46
The a and 46c are chamfered at approximately 45 ° so that the opening diameters thereof widen in the direction of the disk 16 (see FIG. 4), respectively, and are orthogonal to the disk 16 of these openings 46a and 46c. The surface area is configured to be a minimum. Further, a second opening, that is, a filter opening 46b is formed on one side surface of the cover 46 on the plus Y side in the drawing, and a filter 62 constituting an air cleaning means is attached to the filter opening 46b. . In addition, in such a cover 46, an opening connecting the inside and the outside is denoted by reference numeral 4.
Only the openings indicated by 6a, 46b and 46c are provided, and all other points are hermetically or substantially hermetically sealed. The height of the upper surface of the cover 46 is determined by the side yoke 64.
Of the upper surface 64a (see FIGS. 3 and 4).

In the carriage 30, a mirror 32, which is slantly arranged facing the objective lens 34, is adhered, and the laser light emitted from the fixed optical system 20 (see FIGS. 1 and 3) is The light is reflected from the mirror 32 and guided toward the objective lens 34.

The fixed optical system 2 is attached to the carriage 30.
A window portion 30g for passing the laser light emitted from the laser beam 0 through the mirror 32 is formed.
A cover glass 66 is attached to g so as to prevent dust from entering the inside of the movable portion 24. In order to prevent the laser light emitted from the fixed optical system 20 from being reflected by the cover glass 66 and returning to the fixed optical system 20 again, the cover glass 66 is arranged at an inclination with respect to the laser light incident on the movable portion 24. Has been done.

One end of the FPC 42 is attached from the bottom surface of the carriage 30 to the bottom surface and side surfaces of the air-core coil 40. The FPC 42 has a function of energizing the air-core coil 40 of the movable portion 24, the fine actuator 36, and the position detection sensor 38 of the objective lens 34 and dropping the electrically floating component of the movable portion 24 to the ground. It is provided and is connected to the corresponding place by soldering or screws or conductive adhesive.

Next, regarding the configuration other than the movable portion 24, FIG.
Will be described with reference to. The fixed side of the FPC 42 is the base 2
It is fixed by inserting a reinforcing plate 42c into two groove portions 26a projectingly provided on the plate 6. This reinforcing plate 42
c length in the X direction (from the end of the reinforcing plate 42c to the FPC42
In the case of protrusion, the length in the X direction, which is the sum of the reinforcing plate 42c and the FPC 42, is slightly wider than the distance between the two groove portions 26a, so that the reinforcing plate 42c is between the two groove portions 26a. It is fixed tightly with.

A pair of guide rails 28 arranged in parallel with each other are provided on the base 26, and are slidably inserted into the main shaft side bearing 30a and the driven side bearing 30b of the carriage 30. The material of these guide rails 28 is stainless steel, but it is also preferable to improve the durability by, for example, applying Teflon coating to the entire surface or the entire surface except one end. If these guide rails 28 are made of ferromagnetic stainless steel, the guide rails 28 can attract the yoke assembly when assembling the yoke assembly in which the center yoke 68 and the magnet 54 are bonded as described later. Therefore, the yoke assembly can be easily positioned.

Both ends of the guide rail 28 are fixed on the support projections 26b provided on the base 26 by pressing the arms 70a extending on both sides of the leaf spring member 70.

The leaf spring member 70 also has another side surface 70b raised, and the movable portion 24 is provided on the side surface 70b.
A damper 72 for absorbing a shock when the vehicle runs out of control is attached. The leaf spring member 70 is fixed on the base 26 by a fixing screw 70c.

The damper 72 is made of an elastic material such as rubber and has a hollow inside. Therefore, when the movable portion 24 runs away and collides with the damper 72, the damper 72 is elastically deformed and absorbs the impact. Further, when the damper 72 is elastically deformed, an air vent hole 70d inside the damper 72 is formed on the side surface 70b of the leaf spring member 70. The surface of the portion of the carriage 30 that abuts the damper 72 has a roughened surface to prevent the damper 72 from sticking.

The magnetic circuit 52 for generating a thrust force for moving the movable part 24 by the interaction with the coil 40 is composed of a side yoke 64, a magnet 54 and a center yoke 68.

The center yoke 68 is composed of three sheet metal members 6
8a, which are stacked by fitting the half-blanked portions 68b and 68c provided on the sheet metal members 68a to each other (in FIG. 3, the uppermost of the three sheet metal members 68a that are stacked). (Only the half blanks 68b and 68c provided on the sheet metal 68a are shown).

The magnet 54 is positioned in the X direction by the inside of the two half blanks 68b provided on the uppermost surface of the three laminated sheet metal members 68. The center yoke 68 and the magnet 54, which are stacked on each other, are fixed to the base 26 while being inserted into the coil 40. Specifically, three sheet metal members 68a
Through a pair of screw holes 68d formed on both sides of the
By screwing 4 onto the base 26, the center yoke 68 and the magnet 54 are fixed on the base 26.

Further, the side yoke 64 is composed of three layers.
Two half blanks 6 provided on the uppermost surface of the sheet metal member 68
Positioning in the X direction is performed by the outside of 8b. Further, the side yoke 64 is positioned in the Y direction by the two half blanks 68c provided on the uppermost surface of the stacked three sheet metal members 68 and the protrusion 26b of the base 26.

The side yoke 64 is attracted to the center yoke 68 only by the magnetic force and no other fastening means is used. However, as described above, the half blanks 68b and 68c of the center yoke 68 and the base 26 are formed. Since it is positioned by the protrusion 26b, it does not shift. The side yoke 64 is a sintered member, a portion 64a of which is thick, and the cartridge 1 in which the disc 16 is built-in.
When the No. 4 is attached, this thick portion enters into the cartridge 14 (see FIG. 4).

Further, as shown in FIG. 4, a wall 26c is provided on the base 26 so as to surround the above-mentioned main structure, and a deck cover 78 is placed on the wall 26c. The portion below the cartridge 14 having the above-mentioned main structure is maintained in a substantially sealed state. As a result, it is possible to prevent dust from entering the above-mentioned main structure from the lower part of the cartridge 14. A part of the wall 26c may be raised from the spindle motor 18.

In the structure described above, the magnetic circuit 52 and the leaf spring member 70 (see FIG. 3) show only the structure on one side, and the structure on the other side is omitted. Next, the operation of this embodiment and its effect will be described with reference to FIGS.

When the spindle motor 18 is activated, the disk 16 rotates in the direction of the arrow in FIG. This rotation causes a forced air flow in the cartridge 14 in the direction of arrow S1.

When this air flow S1 reaches the side surface 64c of the side yoke 64, a part of the air flow S1 is moved by the arrow S2.
Direction of the disk 16 and the upper surface 64a of the side yoke 64
However, the remaining air flow strikes the side surface 64c of the side yoke 64 in the direction of arrow S3.

At this time, the dust contained in the air flow S3 adheres to the side surface 64c of the side yoke 64 or drops downward because the flow velocity has dropped, and the side yoke 64
It is piled up on the flange surface 64d.

After passing through the upper surface 64a of the side yoke 64, the air flow traveling in the direction of the arrow S2 reaches the vicinity of the opening 46a for outgoing light of the cover 46. Since the side yoke 64 and the cover 46 have substantially the same height and the distance between them is small, the air flow S2 smoothly flows from the side yoke 64 to the cover 46 in the direction from the arrow S4 to the arrow S8.

In the vicinity of the air flow opening 46c of the cover 46 constituting the air cleaning means, the cover 4 is covered by the air flow S6.
Since the outside of 6 has a negative pressure, the air inside the cover 46 is sucked out and an air flow as indicated by arrow S7 is generated.

The air flow out by the air flow of the arrow S7 is supplemented by the clean air flowing in through the filter 62 as shown by the arrow S5 because the other part is sealed. Therefore, the air flowing out from the air flow opening 46c in the direction of the arrow S7 becomes clean air from which dust has been removed by the filter 62.

Such an air flow S7 flows toward the cover 46 and the objective lens 34 side of the dust-containing air flowing in the direction of the arrow S6. Therefore, according to the present embodiment, since the air flow S6 containing dust is guarded by the clean air flow S7 generated from the air cleaning means, the air flow S6 does not collide with or come into contact with the objective lens 34, and minus in the figure. Y
Flow in the direction. As a result, it becomes possible to prevent dust from adhering to the surface of the objective lens 34.

The air flow S7 has the effect of guarding the surface of the objective lens 34, and a part of it flows between the cover 46 and the disk 16 in the direction of arrow S7 '.
The other part flows into the cover 46 in the direction of the arrow S7 ″ from the exit light opening 46a.

In this embodiment, the aperture 46a for outgoing light is used.
The side peripheral surface of is chamfered so that the air flow S7 does not become a turbulent flow, and the surface area orthogonal to the air flow S7 is minimized. Collides with the objective lens 34 or the cover 46
It is possible to prevent the generation of turbulent flow that flows into the inside. As a result, the air flow S7 near the opening 46a for emitted light
Has a very smooth flow, so much air
An air flow S7 'that flows in the outer direction of the cover 46 (that is, the minus Y direction in the figure) is formed and smoothly flows in the direction of arrow S8.

In addition, the air inside the cover 46 is moved by the air flows S6 and S7 through the opening 46a for the emitted light to form an arrow S1.
The air flow S10, which is sucked out in the 0 direction, is the air flow of clean air that has flowed in the direction of the arrow S5 through the filter 62.

Therefore, according to the present embodiment, the back surface of the objective lens 34 inside the cover 46 (that is, the surface opposite to the disk 16), the surface of the mirror 32 (see FIGS. 1 and 2), or the cover glass 66. It is possible to prevent dust from adhering to the inner surface of the movable portion 24.

Further, according to the present embodiment, the air flow S1 containing a large amount of dust that is forcibly generated, such as the air flow generated by the rotation of the disk 16 and the air flow caused by the movement of the optical head, It does not directly hit the filter 62, but hits the shield in front of it, that is, the side surface 64c of the side yoke 64. For this reason, not only dust does not adhere much to the filter 62, but also dust in the air flow adheres to the shield, so that the dust concentration in the air flow decreases. Further, since the airflow collides with the shield, the flow velocity is once reduced, so that the dust in the airflow that has been rolled up falls and the dust concentration in the airflow is reduced. As a result, the filter 62 is less likely to be clogged, and even when it is used for a long period of time, a required amount of air can always be taken in, so that the temperature rise in the optical head can be suppressed within an allowable range, and the movable part The inside of 24 is unlikely to be negative pressure, and it is possible to prevent the problem of dust entering the optical head.

Further, according to the present embodiment, since a clean air flow can be formed by the negative pressure effect caused by the rotation of the disk 16, it is possible to provide a low cost without requiring a separate cleaning device or the like. It becomes possible to provide a device.

The present invention is not limited to the configuration of the above-described embodiment. For example, the mounting position of the filter 62 is not limited to the surface on the plus Y side of the cover 46 in the figure, but the minus Y side surface in the figure. Alternatively, it may be the plus X side surface, the minus X side surface, the minus Z side surface of the carriage 30, or the like. Further, in the above-described embodiment, the openings 46a and 46c are chamfered over the entire circumference. However, for example, even if chamfering is performed only on the downstream side, the same effect can be obtained. Further, the chamfered shapes of the openings 46a and 46c may have an R-shaped cross section. Also, the openings 46a, 46
In addition to directly chamfering the side surface of c, the opening 46a,
Even if 46c is bent obliquely in the direction away from the disk 16, it is possible to obtain the same operational effect as when chamfering.

Next, an information recording / reproducing apparatus according to the second embodiment of the present invention will be described with reference to FIG. In addition,
In the description of this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 5, the cover 46 applied to the information recording / reproducing apparatus of this embodiment has a filter 62 as an air cleaning means so that clean air taken in from the filter 62 is distributed in two directions. The air flow changing wall 4 that extends obliquely in the plus Z direction in the figure from the position where the
6d is integrally formed.

Specifically, in the air flow changing wall 46d, the filter 62 corresponding to the area on the plus Z side in the figure with respect to the air flow changing wall 46d is formed in a tunnel shape in the air flow opening 46c.
Is configured to connect to.

In this embodiment, the air cleaning means comprises an air flow changing wall 46d, a filter 62 corresponding to a region on the plus Z side in the figure with respect to the air flow changing wall 46d, and an air flow opening 46c. Has been done. Since the other structure is the same as that of the first embodiment, the description thereof is omitted.

According to this structure, the air flow changing wall 4
The clean air taken in from the filter 62 on the plus Z side in the figure with respect to 6d becomes the air flow S7 passing through the air flow opening 46c, while the filter on the minus Z side area in the figure of the air flow changing wall 46d. The clean air taken in from 62 flows into the cover 46.

According to the present embodiment, the inclination angle of the air flow changing wall 46d is changed to change the upper and lower opening area ratios of the filter opening 46b to which the filter 62 is attached, or for the emitted light. Opening 46a and air flow opening 4
By changing the dimensions of 6c, the openings 46a,
It is possible to adjust the amount of air sucked from 46c. As a result, the amount of dust attached to the objective lens 34 can be further reduced.

The other operational effects are the same as those of the first embodiment, and the description thereof will be omitted. By the way, in this embodiment, the filter 62 is provided only on the plus Y side of the cover 46 in the drawing.
However, the present invention is not limited to this, and the filter 62 may be separately provided, for example, also in the portion of the cover 46 indicated by the symbol A on the minus Y side in the drawing. In this case, since the effective area of the filter 62 is increased, the dustproof effect can be further enhanced.

Next, an information recording / reproducing apparatus according to the third embodiment of the present invention will be described with reference to FIG. In addition,
In the description of this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, in the cover 46 applied to the information recording / reproducing apparatus of this embodiment, all the clean air taken in from the filter 62 as the air cleaning means is sucked out through the air flow opening 46c. As described above, the air flow changing wall 46b is integrally formed.

That is, the filter opening 46b is connected to the air flow opening 46c through the air flow changing wall 46d, but is not connected to the inside of the cover 46. Therefore,
The cover 46 has no openings other than the exit light opening 46a. The air flow opening 46c is configured so that its opening diameter is larger than that of the outgoing light opening 46a.

In the present embodiment, the air cleaning means includes the air flow changing wall 46d, the air flow opening 46c, and the filter 6
2 and. Since the other structure is the same as that of the first embodiment, the description thereof is omitted.

According to this structure, the air taken in from the filter 62 due to the rotation of the disk 16 is
After the dust is removed by the filter 62, the air flow S7 is sucked out from the air flow opening 46c.

After that, the air flow S7 flows through the upper surface of the objective lens 34, but since the size of the opening diameter of the air flow opening 46c is set to be large, the air flow S7 flowing through the objective lens 34 is air. The amount increases.

As a result, in the objective lens 34, the air flow S7 containing a large amount of clean air causes the air flow S containing dust to flow.
Guarded from 6. At this time, although a small amount of air is sucked out in the direction of arrow S10 from the opening 46a for outgoing light of the cover 46, the air flow S containing clean air.
A part of 7 (that is, an air flow flowing in the direction of arrow S7 ″) is supplemented by flowing into the cover 46.

As a result, only clean air always flows into the cover 46. As described above, according to the present embodiment, it is possible to provide an information recording / reproducing apparatus capable of preventing dust from adhering to the surface of the objective lens 34 and the inside of the cover 46.

The other functions and effects are the same as those of the first embodiment, and the description thereof will be omitted. By the way, in the present embodiment, the filter 62 is arranged in the filter opening 46b, but the present invention is not limited to this, and for example, the air flow opening 46c.
Even if the filter 62 is arranged at the same position, the same effect can be obtained.

Next, an information recording / reproducing apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. In addition,
In the description of this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 7, the information recording / reproducing apparatus of the present embodiment is applied with the side yoke 64 which is thinner than the first embodiment in the minus Z direction in the figure, An air cleaning unit 80 as an air cleaning unit is fixed on the side yoke 64 arranged on the plus Y side in the drawing with respect to the movable portion 24. The cover 46 has
No openings other than the exit light opening 46a are formed.

The air cleaning unit 80 includes the side yoke 6
4 is tightly adhered to the upper surface of the side yoke 64, and the gap between the flange surface 64d of the side yoke 64 and the cartridge 14 is kept airtight by the collar portion 80c protruding from the air cleaning unit 80. It is sealed.

The height of the air cleaning unit 80 from the side yoke 64 is set to be the same as that of the cover 46. In such an air cleaning unit 80, an air flow opening 80a is formed on the disk 16 side, and a filter opening 80b to which a filter 62 is attached is formed on the minus Y side in the drawing. .

Further, in the air cleaning unit 80, the length in the X direction in the figure (that is, the moving direction of the movable portion 24) is matched with the length of the side yoke 64 in the X direction in the figure, and similarly, The air flow opening 80a and the filter opening 80b are also formed to extend in the X direction in the drawing. In particular,
The air flow opening 80a and the filter opening 80b are each formed to extend over the same extent as the moving region of the movable portion 24.

According to this structure, the air in the air cleaning unit 80 is sucked out as the air flow S7 from the air flow opening 80a by the air flow S2 caused by the rotation of the disk 16.

Since the air in the air cleaning unit 80 is sucked out, the filter 6 in the filter opening 80b
Although new air is taken into the air cleaning unit 80 from No. 2, the air is clean air from which dust is removed by the filter 62. Further, as described above, the air cleaning unit 80 is in close contact with the side yoke 64 while maintaining airtightness, and the gap between the flange surface 64d of the side yoke 64 and the cartridge 14 is separated from the air cleaning unit 80. The protruding collar portion 80c is hermetically sealed so that airtightness is maintained.

Therefore, the air flow S7 sucked from the air flow opening 80a by this circulation cycle is a flow of only clean air. In this way, the air flow S7 containing clean air flows toward the cover 46 and the objective lens 34 side more than the air containing dust flowing in the direction of the arrow S6. As a result, the objective lens 34 causes the air flow S containing clean air.
7 guards against an air flow S6 containing dust. At this time, a part of the airflow S7 is covered by the cover 46.
Between the disk 16 and the disk 16 in the direction of arrow S7 ', and another part of the light flows from the opening 46a for outgoing light into the cover 46 by the arrow S.
Inflow in the 7 ″ direction.

Therefore, according to the present embodiment, since the air cleaning unit 80 is provided as an air cleaning unit on the upstream side of the air flow with respect to the movable portion 24, dust on the surface of the objective lens 34 and the cover 46 is prevented. It is possible to provide an information recording / reproducing device capable of preventing adhesion.

Since the other operational effects are the same as those of the first embodiment, the description thereof will be omitted. By the way, in the present embodiment, since the air flow opening 80a and the emitted light opening 46a are arranged apart from each other, the clean air flow S7 and the dust-containing air flow S6 are mixed with each other. However, since the air flow S7 containing a large amount of clean air is formed, the air in the vicinity of the objective lens 34 is maintained in a relatively clean state.

The following technical idea is derived from the present invention from the above-mentioned specific configuration. (1) An objective lens that focuses laser light emitted from a light source on a predetermined portion of a recording medium, a photodetector element that receives reflected light reflected from the recording medium, the light source, objective lens, and light A movable part for moving at least the objective lens of the optical head having a detection element in the radial direction of the recording medium, a first opening provided at a position facing the objective lens, and an air flow flowing toward the movable part. An information recording / reproducing apparatus having an air cleaning means provided on the upstream side of the. (2) The air cleaning means is provided at a position facing the recording medium, a second opening provided at a position away from the optical axis of the objective lens, a filter attached to the second opening. The information recording / reproducing apparatus as described in (1) above, which comprises a third opening. (3) The information recording / reproducing apparatus according to (2), wherein the air cleaning means is provided in the movable portion.

This structure corresponds to the first to third embodiments. (4) The information recording / reproducing apparatus according to (2), wherein the air cleaning unit is provided in a fixed portion.

This configuration corresponds to the fourth embodiment. (5) The information recording / reproducing apparatus according to (3), wherein the air cleaning unit has an air flow changing wall that guides an air flow taken in from the filter in two directions of the first opening and the third opening.

This configuration corresponds to the second embodiment. (6) The information recording / reproducing apparatus according to (3) or (4), wherein the air cleaning unit has an air flow changing wall that guides the air flow taken in from the filter only in the third opening direction.

This configuration corresponds to the third and fourth embodiments. (7) The information recording / reproducing apparatus according to (5), wherein the first opening is chamfered to widen toward the recording medium.

[0086]

According to the information recording / reproducing apparatus of the present invention, since the air cleaning means is provided on the upstream side of the air flow flowing toward the movable portion, the air flow is clean and smooth inside and outside the movable portion. It is possible to prevent the adhesion of dust to the surface of the objective lens and the intrusion of dust into the movable part by generating the.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view schematically showing a main configuration of an information recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view schematically showing a configuration of a movable part applied to the device shown in FIG.

FIG. 3 is an exploded perspective view schematically showing a main configuration of an information recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory diagram of the information recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of the information recording / reproducing apparatus according to the second embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of an information recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 7 is an operation explanatory diagram of the information recording / reproducing apparatus according to the fourth embodiment of the present invention.

FIG. 8A is an exploded perspective view schematically showing the configuration of a movable portion applied to a conventional information recording / reproducing apparatus, and FIG.
[FIG. 3] is a perspective view of a cover provided on a movable part.

[Explanation of symbols]

16 ... Disc, 24 ... Movable part, 34 ... Objective lens, 4
6c ... Air flow opening, 62 ... Filter, S2, S7 ... Air flow.

Claims (3)

[Claims] 1. An objective lens for condensing laser light emitted from a light source onto a predetermined portion of a recording medium, a photodetector for receiving reflected light reflected from the recording medium, the light source, and objective lens. A movable part for moving at least the objective lens of the optical head having a photodetection element in the radial direction of the recording medium, a first opening provided at a position facing the objective lens, and air flowing toward the movable part. An information recording / reproducing apparatus comprising: an air cleaning unit provided on the upstream side of the flow. 2. The air cleaning means is a second device provided at a position away from the optical axis of the objective lens.
2. The information recording / reproducing apparatus according to claim 1, wherein the information recording / reproducing apparatus comprises: an opening, a filter attached to the second opening, and a third opening provided at a position facing the recording medium. 3. The information recording / reproducing apparatus according to claim 1, wherein the first opening is chamfered to widen toward the recording medium side.