JP2575946Y2 - Optical pickup cleaning device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup cleaning device, for example, for recording and / or recording on a disk-shaped optical recording medium.
Alternatively, the present invention relates to an optical pickup cleaning device for cleaning an objective lens of an optical pickup for reproduction.

[0002]

2. Description of the Related Art An optical system called an optical pickup is used for recording a signal on a disk-shaped optical recording medium such as an optical disk or a magneto-optical disk or reproducing a recorded signal.

[0003] Since the objective lens of this optical pickup is exposed to the outside air, dust, dust, oil, cigarette dust and the like may adhere to the objective lens. Has a negative effect.

As means for cleaning the objective lens of the optical pickup, there has been proposed a configuration in which a brush or the like is erected on a signal recording surface of a disk medium and the brush traces the objective lens surface by rotation of the disk medium. Has been commercialized. For example, Utility Model Application Publication No. 57931 in 1987, Patent Application Publication No. 43386 in 1999
No., Utility Model Application Publication No. 31474, 1992.

In these conventional examples, one or more brushes are mounted on the disk medium surface, and each brush is arranged along the radial direction of the disk medium. FIG. 2 is a plan view of a conventional example in which four brushes are arranged, and FIG. 3 is a central sectional view taken along line AA in FIG. 10 is disk based,
Reference numeral 12 denotes a center hole, and 14, 16, 18, and 20 denote cleaning tools mounted on the disk base 10 so as to stand upright from the disk base 10. The cleaning tools 14 to 20 are made of brush, chamois, non-woven fabric, or the like. The height H of the cleaning tools 14 to 20 from the surface of the disk medium is usually about 2 mm, and is cut to this height by a disk cutter after being mounted on the disk base 10.

[0006] Even when the optical pickup is cleaned, the reproducing apparatus (or the recording apparatus) is performing a tracking operation for reproducing or recording. If the area where the cleaning tool shields the objective lens surface from light is not reduced, a tracking error occurs. It stops. Therefore, in the conventional example, the cleaning tools 14 to 20 are used.
Is set extremely small.

[0007] The cleaning ability is reduced by the small thickness D, but this is covered by increasing the width W of the cleaning tools 14 to 20. In other words, the optical pickup moves from the inner peripheral side to the outer peripheral side (or the opposite direction) with the rotation of the disk base 10, so that the cleaning tools 14 to 20 are moved.
Is increased, the number of times the cleaning tools 14 to 20 trace the objective lens surface is increased, and the cleaning ability is enhanced.

That is, in a cleaning disk of a type in which a recording device or a reproducing device is operated to clean an objective lens of an optical pickup, a cleaning tool such as a brush is thin in a rotating direction of a disk base and long in a radial direction. It has a shape.

[0009]

However, even if the width W is increased, the cleaning ability cannot be increased so much. In addition, as the recording density increases, the cleaning tools 14 to 20 increase.
Has to be reduced.

Accordingly, an object of the present invention is to provide an optical pickup cleaning device having a higher cleaning ability.

[0011]

An optical pickup cleaning device according to the present invention has at least one cleaning means which is thin in the rotation direction of the disk base, and is attached to a surface of the disk base facing the optical pickup. At least one cleaning means is arranged obliquely with respect to a line extending radially from the center line of rotation of the disk base.

The present invention is also an optical pickup cleaning device for cleaning an objective lens surface of an optical pickup by stroking from the side. The apparatus is thin in a direction toward an objective lens of the optical pickup and is thin in a lateral direction thereof. The at least one cleaning means, such that one end in the width direction of the at least one cleaning means reaches the objective lens surface before the other end.
The optical pickup is attached to the base at an angle from a plane perpendicular to the direction toward the objective lens.

[0013]

According to the above means, the effective distance of the cleaning means tracing the objective lens surface can be increased, and the cleaning ability is improved. In other words, it is possible to obtain a cleaning ability similar to that of the conventional example with a thinner cleaning means. The thinner area reduces the area that blocks the objective lens from light.
Errors are less likely to occur.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention having two cleaning tools, and FIG. 4 is a plan view thereof. Reference numeral 30 denotes a disk base, and 32 denotes a center hole of the disk base 30. On the surface of the disk base 30 corresponding to the signal recording surface, two cleaning tools 34 and 36 for cleaning the objective lens of the optical pickup are mounted upright. The cleaning tools 34 and 36 are specifically made of a brush, a chamois or a nonwoven fabric. In this embodiment, the brushes 34,
As shown in FIG. 4, reference numeral 36 denotes a shape that is thin in the rotation direction of the disk base 30 and long in the radial direction, and is inclined at −θ and + θ with respect to the radial direction to be opposite to the center hole 32. Installed.

The cleaning tools 34 and 36 include a disk base 3
They may be mounted at the same distance from the center of rotation 0, but may be mounted slightly offset from each other. Then, the cleaning distance (or cleaning time) of the disk base 30 in the radial direction can be effectively increased.

Referring to FIG. 5, the operation of tilting the cleaning tools 34, 36 from the radial direction will be described. FIG. 5 is a plan view showing the positional relationship between the objective lens surface of the optical pickup and the cleaning tools 34 and 36. Reference numeral 38 denotes an objective lens surface of the optical pickup, which has a circular shape with a radius R. Then, it is assumed that the cleaning tool 34 or the cleaning tool 40 corresponding to the cleaning tool 36 moves in the direction of the arrow 42 and traces the object lens surface 38 to be cleaned. The moving direction of the optical pickup is indicated by reference numeral 44. In the case of a compact disk, the optical pickup moves from the inner peripheral side to the outer peripheral side during reproduction, and the cleaning tool 40 cleans the objective lens surface during the movement.

As shown in FIG. 5, the width of the cleaning tool 40 is W,
Assuming that the thickness is D, and the inclination angle of the cleaning tool 40 with respect to the radial direction (r direction) of the disk base 30 is θ, the effective distance of the cleaning tool 40 tracing the objective lens surface 38 in the moving direction 42 of the cleaning tool 40 ( (Or effective thickness) De is given by the following formula: De = D / cos θ. That is, as θ increases, De increases, and the cleaning ability is improved.

In order for the cleaning tool 40 to trace the entire width of the objective lens surface 38 at once, the width W of the cleaning tool 40 may be W ≧ 2R / cos θ. In order to ensure that the cleaning tool 40 traces the objective lens surface 38 for n rotations of the disk base 30, the distance that the optical pickup moves in the radial direction by one rotation of the disk base 30 is set to d. Then, it is sufficient that W ≧ (2R + nd) / cos θ.

When the cleaning tool 40 is inclined in the positive direction (θ> 0) as shown in FIG.
Dust and the like adhering to 8 are swept from the inside to the outside in the radial direction of the disk base 30. Conversely, when the cleaning tool 40 is inclined in the negative direction (θ <0), the cleaning tool 40 sweeps dust and the like of the objective lens surface 38 from the outside to the inside.

In the embodiment shown in FIG. 1 and FIG.
Although the inclination angles of 4 and 36 are set to plus and minus, and the sweeping to the outside and the sweeping to the inside are used together, only one of them may be used. FIG. 6 shows a plan view thereof. In FIG.
50 is a disk base, 52 is a center hole, and 54 and 56 are cleaning tools.

Further, the cleaning tools may be used in combination with cleaning tools arranged along the radial direction like the cleaning tools 14 to 20 of the conventional example. FIGS. 7, 8 and 9 show plan views of an embodiment having three cleaning tools. 7, 8 and 9, 60, 7
0,80 is disk-based, 62,72,82 central hole, 64, 66, 68; 74, 76, 78; 84,8
Reference numerals 6 and 88 denote cleaning tools. The cleaning tools 64 , 66 , and 68 may be arranged at an equiangular distance in the circumferential direction, but are not necessarily required to be at an equiangular distance. Cleaning tools 74 , 76 , 78 ;
The same applies to 84 , 86 and 88 .

Assuming that the disk bases 60, 70, and 80 rotate clockwise, in FIG. 7, the cleaning tool 64 sweeps out dust and the like straight, the cleaning tool 66 sweeps inward, and the cleaning tool 68 sweeps out. . In FIG. 8, the cleaning tool 74 sweeps out dust and the like in a straight line,
Are swept out, and the cleaning tool 78 is swept inward. FIG.
Then, the cleaning tool 84 straightly sweeps out dust and the like, and both the cleaning tools 86 and 88 sweep out to the outside.

As described above, the cleaning tools 62, 64,
66; 72, 74, 76; 82, 84, 86 are cut to a predetermined height while being attached to the disk bases 60, 70, 80. In that case, a cleaning tool whose hair ends are to be trimmed is conveyed along its width direction so as to be sandwiched between two disk carters. Therefore, when there are a plurality of cleaning tools, it is preferable that each cleaning tool be as parallel as possible in the width direction. This is because the parallel cleaning tools can cut the hair tips simultaneously by one cutting operation.

In this respect, in the embodiment shown in FIG. 7, the hair tips of the three cleaning tools 64, 66, 68 can be cut by one cutting operation. The inclination angle of the cleaning tool 66 is θ1, and the cleaning tool 68 is
If the angle between the cleaning tool 64 and the cleaning tool 66 is (180-θ1) degrees, and the angle between the cleaning tool 64 and the cleaning tool 68 is (180-θ2) degrees, the cleaning tool 64 , 6
6, 68 are parallel.

FIG. 8 shows the cutting of the cleaning tool 74 and the cleaning tool 7.
The cutting process is required twice for 6,78 cuts. In FIG. 9, the cutting process is required twice for the cleaning tools 84, 86 and the cleaning tool 88.

FIG. 10 shows the embodiment shown in FIG.
-The figure developed on the angle ((theta)) plane is shown. The cleaning tools 64, 66, 68 may be arranged at substantially the same radial position as shown by the solid line, but may be arranged at different radial positions as shown by the broken line. In a system in which the optical pickup normally moves from the inner side to the outer side, it is preferable to arrange the brushes 64, 66, and 68 at the latter position, that is, at a radial position corresponding to the movement of the optical pickup in terms of cleaning time. . 8 and 9 are the same.

As described above, a brush, a chamois, or a nonwoven fabric can be used as a cleaning tool for cleaning the objective lens surface.

In the above embodiment, the cleaning tool is fixed to the disk base. However, each cleaning tool may be detachable from the disk base. Then, only the curved cleaning tool can be replaced. For this purpose, for example, as shown in FIG. 11, the cleaning tool 90 may be fixed to a table 92 having a thread around it, and a hole 94 for screwing the table 92 may be formed in the disk base. Of course, the table 92 and the hole 9 are so arranged that the cleaning tool 90 is mounted on the disc base at an angle to the radial direction from the center hole.
It is good to set screw 4

Another configuration that makes the cleaning tool detachable from the disk base is described in Japanese Utility Model Registration Application No. 92 in 1990.
No. 780 can also be used.

Although the embodiment in which the optical pickup of the recording / reproducing apparatus for a disk-shaped recording medium, that is, a rotating recording medium is cleaned has been described, the present invention is directed to an optical card for a card-shaped recording medium which moves linearly such as an optical card. It can also be applied as a pickup cleaning device.

[0032]

As can be easily understood from the above description, according to the present invention, an optical pickup cleaning disk having a higher cleaning ability can be provided. In other words, a cleaning ability similar to that of the conventional example can be obtained with a thinner cleaning means.
As a result of reducing the area for shielding the objective lens from light, tracking errors and the like are less likely to occur during cleaning.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a plan view of a conventional example.

FIG. 3 is a center sectional view taken along line AA in FIG. 2;

FIG. 4 is a plan view of the embodiment shown in FIG.

FIG. 5 is a diagram illustrating the principle of the present invention.

FIG. 6 is a plan view of another embodiment of the present invention.

FIG. 7 is a plan view of another embodiment of the present invention.

FIG. 8 is a plan view of another embodiment of the present invention.

FIG. 9 is a plan view of another embodiment of the present invention.

FIG. 10 is a development view of an r-θ plane in the embodiment of FIG. 7;

FIG. 11 is a perspective view of a configuration in which a brush is detachable from a disk base.

[Explanation of symbols]

10: Disk base 12: Center hole 14, 16,
18, 20: brush 30: disk base 32:
Center holes 34, 36: Cleaning tool 38: Object lens surface of optical pickup 40: Cleaning tool 42: Moving direction of cleaning tool 40 44: Moving direction of optical pickup 50: Disk base 52: Center holes 54, 56: Cleaning tool 6
0, 70, 80: Disk base 62, 72, 8
2: Central hole 62, 64, 66, 72, 74, 76, 8
2, 84, 86: cleaning tool 90: cleaning tool 92: table 94: hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G11B 7/12 G11B 23/00

Claims (4)

(57) [Scope of request for utility model registration] 1. A thin disk base in a rotating direction of the disk base is provided on a surface of the disk base facing the optical pickup.
An optical pickup cleaning disk having the above-described cleaning means mounted thereon and cleaning the objective lens surface of the optical pickup by the cleaning means, wherein at least one cleaning means extends in a radial direction from a rotation center line of the disk base. An optical pickup cleaning device, which is arranged to be inclined with respect to a line. 2. The light according to claim 1, wherein at least one of said one or more cleaning means is disposed so as to be inclined in a direction opposite to a line extending radially from a rotation center line of said disk base. Pickup cleaning device. 3. The optical pickup cleaning device according to claim 1, wherein said at least one cleaning means is arranged in parallel with each other. 4. An optical pickup cleaning device for cleaning an objective lens surface of an optical pickup by stroking the object from the side, comprising: a base, at least one thin in a direction toward the objective lens of the optical pickup and wide in a lateral direction thereof. The at least one cleaning unit is provided with an objective lens of the optical pickup such that one end in the width direction of the at least one cleaning unit reaches the objective lens surface before the other end. An optical pickup cleaning device, wherein the optical pickup cleaning device is attached to the base at an angle from a plane orthogonal to a direction toward the base.