JPH03269883A - Objective lens cleaner - Google Patents

Abstract

PURPOSE:To clean plural objective lenses simultaneously by providing one cleaning part comprised so as to come in contact with the objective lenses arranged in a linear direction at every objective lens. CONSTITUTION:This cleaner is provided with the cleaning part formed so as to come in contact with each objective lens in a state where it is inserted from a cartridge insertion port. Both brushes 22, 21 are made of plypropylene, and the length of brush material for the brush 21 is formed longer than that of the brush material for the brush 22, which is shown as l<L. Also, the thickness of the brush material for the brush 21 is formed thicker than that of the brush material for the brush 22. The same optimum cleaning effect can be applied to each objective lens by using the brush with short brush for the objective lens with short working distance and the one with long brush and with thicker brush for the objective lens with long working distance corresponding to the difference of the working distance of two objective lenses.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an objective lens cleaning device used in an optical disc device.

(Prior Art) Generally, in an optical disk drive device, light from a semiconductor laser is finally focused by an objective lens to form a minute spot on an optical disk. Therefore, the surface of the objective lens is normally exposed to the atmosphere.

On the other hand, various types of dust, typified by cigarette smoke, are floating in the atmosphere, and this dust enters the inside of the optical disk drive device. In particular, when the optical disk drive device is powered on, the forced cooling fan placed behind the optical disk drive rotates regardless of whether an optical disk is inserted or not, blowing air into the optical disk drive. A large amount of dust inevitably enters the device because it is sucked into the device.

These dust particles adhere to and accumulate on the surfaces of optical components, such as objective lenses, which lowers the reflectance and transmittance of the optical components, which can cause trouble in recording and reproducing information.

To solve these problems, a technique was proposed in Japanese Patent Application Laid-Open No. 62-2679 to clean the objective lens by bringing a rotary brush rotatably supported into contact with the objective lens.
It is disclosed in Publication No. 31.

An overview of this technology will be explained with reference to FIGS. 5 to 7.

In FIG. 5 illustrating the optical disk drive device,
Reference numeral 1 indicates a housing of the apparatus, reference numeral 2 a tray into which a cartridge is inserted, reference numeral 3 a spindle motor for chucking a disk, and reference numeral 4 an optical pickup equipped with an objective lens 5.

No. 6 showing the objective lens cleaning cartridge that is installed and used in this optical disk drive device.
In the figure, reference numeral 6 indicates a hole 7 for avoiding the spindle during installation.
8 is a rotary brush which is an objective lens cleaning member; 9, 10°; 11 and 12 are pulleys; 13 is a shaft; 14 is a drive motor; 15 is a belt; 16 is a battery as a driving source; 17 is a control unit; 18 is a control unit;
indicates a switch, respectively.

When the cleaning cartridge 6 is inserted into the optical disk drive device 1, the tray 2 is lowered by a loading mechanism and a positioning mechanism (not shown) as shown in #7, and the cleaning cartridge main body 6 is held in a predetermined position, and the rotary - The brush 8 and objective lens 5 are in contact.

Here, by pressing the switch 18, the drive motor 1
4 rotates, the rotary brush 8 is rotated by the belt 15 and shaft 13, and the objective lens is cleaned.

The above is an outline of an objective lens cleaning device that can be applied to an optical disk drive device that includes one pickup per device.

Nowadays, optical disk drive devices exist that have multiple pickups per device. The reason is explained below.

When recording information and reproducing the recorded information at the same time in an optical disk device using a medium on which information can be rewritten, there are three steps: ■ erasing existing recorded information, ■ recording new information, and ■ reproducing the information. It takes two steps.

Therefore, in an optical disk device that has only one optical pickup, the above-mentioned process is completed for each revolution of the media, so recording and playback cannot be performed unless the media is rotated three times, making it unsuitable for high-speed processing of information. .

Therefore, by using two or three optical pickups and having each optical pickup share the above-mentioned steps, recording and reproduction can be performed in two or one rotation.

In this case, in a device where the approximate diameter of the media is the external width of the optical disc device, in order to arrange each optical pickup while ensuring this width, conventionally the optical pickups have been arranged in a direction perpendicular to the external width. I had no choice but to do it.

In response, an optical disk drive device as shown in Figs. 8 and 9 has been proposed with the aim of enabling high-speed processing of information using multiple optical pickups while ensuring space efficiency. Jitsugan No. 1-82725).

(Means for Solving the Problems) That is, the first axis is on the outer width direction and has the rotation center 0 of the media at the midpoint of the outer width dimension. ! y-y is assumed to be in the width direction of the outer shape, and at least two lines passing through the rotation center ○ are located within any one side area bordering this first straight line.
When the second lines aRr-t -Ll, L, -L of the book are arbitrarily assumed, optical pickups are arranged so as to be movable on each of these second M lines.

Here, the external width dimension is W, the radius of the media is r, and the dimension from the center of the objective lens of the optical pickup to the outline of the movable part of the optical pickup in the direction of the external width and away from the rotation center ○. A.

When the angle between the first straight line and the second straight line is θ.

The relationship r QO5θ<--A (0<θ>) was satisfied.

By doing this, in FIG. 9, the second straight line,
- L, if the external width dimension of the optical disk device is W, the dimension from the center of rotation O to the external contour in the width direction is W/2, and if the radius of the media is r, then the optical pickup 4' objective lens center is rotation center 0
It must satisfy one of the positions of the arc g''g with radius r centered at Since it can be drawn an infinite number of times, let A be the outline of the movable part of the optical pickup 4' from the center of the objective lens of the optical pickup 4' in the width direction and away from the rotation center 0,
If the angle between the first straight line y-y and the second straight line, -L, is θ, then r cosθ<--A (0<
As long as the relationship θ) is satisfied, the optical pickup will not protrude in the width direction.

(Problem M to be Solved by the Invention) As mentioned above, in a high-speed optical disk drive device configured to have a plurality of objective lenses, the arrangement and number of objective lenses are different from conventional ones. You cannot use objective lens cleaning cartridges such as

SUMMARY OF THE INVENTION An object of the present invention is to provide an objective lens cleaning device capable of cleaning objective lenses in an optical disk drive device having a plurality of objective lenses.

(Means for Solving the Problems) In order to achieve the above object, the cleaning device of the present invention has a shape that can be inserted from a cartridge insertion slot of an optical disk drive device, and after insertion, the cleaning device is arranged in the plurality of linear directions as described above. A cleaning part configured to come into contact with the objective lens.

It was decided to provide one for each of the above-mentioned objective lenses.

(Function) Each cleaning section is provided corresponding to each objective lens,
Each lens can be cleaned individually.

(Example) An objective lens cleaning cartridge as an example of an objective lens cleaning device according to the present invention is shown in FIGS. 1 and 2.

This embodiment assumes an optical disk drive device having two optical pickups, such as the one shown in FIG. 9, and the theta directions of both pickups are approximately 90 degrees.

In FIG. 1, reference numeral 19 indicates a cartridge body, and reference numeral 2
0 is a hole to avoid the spindle motor, code 21e
22 is a brush material which is an objective lens cleaning part;
Code 23.24.25.25.26.27.28.29
30 is a pulley, 31 is a motor, 32 is a battery as a motor drive power source, 33 is a motor on/off switch, and 34, 35, and 36 are belts, respectively.

By the way, when the distance is divided for each optical pickup, such as in an optical disc device that has a plurality of objective lenses and the movement directions of each of these objective lenses are set in a plurality of linear directions passing through the center of rotation of the disc, Objective lenses of different materials and shapes may be used for each step, so each objective lens has a distance (
working distance), the shape of the objective lens surface, or the hardness of the surface coating. Therefore, in this case, in order to perform optimal cleaning, it is necessary to use a cleaning member of the optimal material and shape for each objective lens, and it is not enough to simply increase the number of cleaning members. do not have.

Therefore, in order to meet these demands, the present embodiment has a cleaning section configured to come into contact with each objective lens when inserted from the cartridge insertion port, and the material or length of the cleaning member is is optimized for each objective lens.

Therefore, although the brush 22 and the brush 21 are both made of polypropylene, the length of the brush 21 is longer than that of the brush 22. That is, in FIG.
<L. Further, the thickness of the brush material 21 is made thicker than that of the brush material 22. This is due to the difference in working distance between the two objective lenses; the objective lens with a short working distance uses a brush with short bristles, and the objective lens with a long working distance uses a brush with long bristles. In addition, by using a thick brush, it is possible to provide the same optimal cleaning effect to the two objective lenses.

To explain the operation of this cleaning cartridge, first, when this cartridge is inserted into a drive device through a normal cartridge insertion port, each objective lens and the brushes 21 and 22 come into contact as shown in FIG.

By pressing the switch 33, the motor 3
1 rotates, and at the same time pulleys 23 and 24 rotate. The rotation of the pulley 24 is transmitted to the belt 34 => pulley 25, and the brush 22 rotates. Also, the rotation of the pulley 23 is as follows: belt 36 → pulley 29.30 =) pulley 28
．． 27 => Belt 35'3 The brush 21 rotates through the pulley 26. As a result, two brushes can be rotated simultaneously with one driving source, and a leaning cartridge can be provided with a simple mechanism and at low cost.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In each episode, numeral 37 is the cartridge body, numeral 38
On the back side of the page is a bevel gear shaped so that it can be chucked onto the turntable of the spindle motor 43, code 39.4.
0 is a bevel gear that meshes with the bevel gear, code G, 42
is a brush material as a cleaning part. In this embodiment, the drive source for the brush members 41 and 42 is not a battery but a spindle motor within an optical disk drive device.

That is, by chucking the bevel gear 38 to the turntable of the spindle motor 43, the rotation of the spindle is transmitted from the bevel gear 38 to the bevel gears 39, 40, which causes the brushes 41, 42 to simultaneously rotate. Clean the objective lens in the manner shown in Figure 7. However, it goes without saying that the bristles and thickness of the brushes 41 and 42 are different in this embodiment as well.

(Effects of the Invention) According to the present invention, the cleaning unit configured to come into contact with objective lenses arranged in a plurality of linear directions,
Since one cleaning device is provided for each objective lens, all the objective lenses of an optical disk drive device having a plurality of optical pickups can be cleaned at the same time.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the first embodiment of the present invention, and FIG.
4 are explanatory diagrams of a second embodiment of the present invention, FIGS. 5 to 7 are explanatory diagrams of a conventional example, and FIGS. 8 and 9 are explanatory diagrams of an optical disk drive device suitable for the present invention. It is a diagram. 21, 22.40.41...Brush material, Ll-L work. L, -L, ... second straight line.

Claims (1)

[Claims] 1. An objective lens used in an optical disc device having a plurality of objective lenses, each of which is set in a plurality of linear directions passing through the center of rotation of the disc.
A cleaning device, the cleaning portion having a shape that can be inserted from the cartridge insertion port of the optical disk drive device and configured to come into contact with the objective lenses arranged in the plurality of linear directions after insertion, An objective lens cleaning device characterized in that one objective lens cleaning device is provided for each of the objective lenses.