JPH0612693A - Optical disk player - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the sticking of dust to an optical reflection body in a cover. CONSTITUTION:The cleaning member 24 of a shutter opening arm 21 is formed by the cleaning member having a length coming into contact with an objective lens 20 in the state of exposing the lens. Thus, when the objective lens 20 is exposed out of the cover 19, the cleaning member 24 is brought into contact with only the lens surface 20a of the objective lens 20 by the operation of the shutter opening arm 21. Thus, no part of the cleaning member 24 comes into contact with the surface of the cover 19 at the cleaning of the lens and the entering of dust caused by the cleaning member 24 into the cover 19 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc player provided with a shutter opening arm having a cleaning member for cleaning a lens.

[0002]

2. Description of the Related Art For reading a signal recorded on an optical disc such as a laser disc, a laser light source of an optical pickup device irradiates a disc recording surface with a laser beam and detects reflected light returned from the laser beam. Done by.

At this time, the laser beam emitted from the laser light source is focused on the recording surface of the disc by a spot having a predetermined diameter by narrowing the light beam by the objective lens of the optical pickup device. Further, the content of each signal is detected by the difference in the light amount of the returning light.

Therefore, if dust adheres to the objective lens (lens surface) of the optical pickup device, the light control function for the irradiation light and the returning light of the laser beam is impaired, or the disk recording surface is irradiated by irregular reflection. The amount of light to be emitted becomes insufficient, and a signal reading error easily occurs.

Particularly, in an optical disc player mounted on a vehicle, which is used in a dusty environment, there is a high possibility that dust will adhere to the objective lens, so that many signal reading errors occur.

Therefore, it is necessary that the objective lens of the optical pickup device is always kept in a clean state.

On the other hand, among the optical discs, those having a high signal recording density are used as they are in a cartridge case made of a hard material.

The cartridge case is provided with an opening window that opens inside and outside the case, and a shutter that opens and closes the opening window is mounted so as to be movable back and forth.

By the way, an optical disc player that handles such an optical disc cartridge is rotatably provided with a shutter opening arm that applies a force in the direction of opening the opening window to the shutter by inserting the disc cartridge. .

Conventionally, in this type of optical disc player, as shown in FIGS. 5A to 5C, the shutter opening arm 1 is moved along with the rotating operation to wipe the objective lens 3 of the optical pickup device 2 for cleaning. The one provided with the brush 4 as a member is adopted.

Here, reference numeral 5 is a cover for an optical pickup device having a light passage window 5a opening in the vertical direction and incorporating the objective lens 3, and 6 is housed in the cover 5 and the objective lens 3 is covered. It is a reflector provided below. Reference numeral 7 in the figure is dust.

This type of optical disc player is
Previously, the applicant of the present invention filed No. 63-184449.
No.

In the optical disc player having such a structure, the brush 4 is moved by the rotation of the shutter opening arm 1 and comes into contact with the light emitting surface 3a of the objective lens 3.

As a result, the light exit surface 3a of the objective lens 3
Removes the dust 7 to form a clean lens surface.

[0015]

However, in the conventional optical disk player, the objective lens 3 is always housed in the cover 5, so that a part of the brush faces the cover 5 as a cleaning member during lens cleaning. A brush 4 with different dimensions was needed. As a result, brush 4
While moving, the light exit surface 3a of the objective lens 3 as shown in FIG.
Not only does it come into contact with the cover 5 but wipes the dust 7 outside the cover 5 (on the cover surface) into the cover 5, and the dust 7 drops and adheres to the reflecting surface 6a of the reflector 6. there were.

The present invention has been made in view of the above circumstances, and it is possible to prevent dust from entering the cover by a cleaning member during lens cleaning, and thus to prevent dust from adhering to the light reflector inside the cover. The present invention provides an optical disc player that can be prevented.

[0017]

In an optical disc player according to the present invention, a casing into which a disc cartridge with a shutter can be inserted / removed, a cover which is provided in the casing so as to be movable back and forth, and which has a built-in light reflector, and this cover are provided. An optical pickup device having an objective lens capable of appearing and retracting inside and outside a cover, and an arm with a lens cleaning member for reciprocatingly provided outside the cover of the optical pickup device and opening a shutter by inserting a disk cartridge. , The cleaning member for this arm,
It is formed by a cleaning member having a length that makes contact with the objective lens when the lens is exposed.

[0018]

In the present invention, when the objective lens is exposed outside the cover, the cleaning member can be brought into contact with only this objective lens.

[0019]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing an essential part of an optical disc player according to the present invention, FIG. 2 is a plan view schematically showing the entire optical disc player according to the present invention, and FIG. 3 is an optical disc player according to the present invention. 6 is a flowchart shown for explaining a lens raising / lowering operation associated with the eject operation of FIG.

In the figure, reference numeral 11 is a housing having a cartridge insertion / removal opening 12 which is opened in the front-rear direction, and a cartridge holder 15 into which a disk cartridge 14 with a shutter 13 can be inserted / removed is provided inside. Has been. A turntable 16 capable of attracting the disc 14a of the disc cartridge 14 and a motor (not shown) for rotating the turntable 16 at a high speed are provided in the housing 11.

Reference numeral 17 denotes an optical pickup device for reading a recording signal on the disk 14a. The cover 19 has a built-in light reflector 18, an objective lens 20 which can be retracted in and out of the cover 19, and light from the objective lens 20. It is composed of an optical component (not shown) such as a light source that emits a laser beam along the axis, and is provided in the housing 11 so as to be movable back and forth. Objective lens 2 of this optical pickup device 17
0 is raised (exposed to the outside of the cover 19) by driving an eject motor (not shown) as shown in FIG. 3 at the time of eject (when the cartridge is ejected), and after ejecting the disc cartridge 14, the eject motor ( It is configured to descend (sink into the cover 19) by stopping (not shown).

Reference numeral 21 denotes a substantially V-shaped shutter opening arm, which is rotatably provided on the left side edge of the rear end portion of the cartridge holder 15 via a support shaft 22. The shutter opening arm 21 opens the shutter 13 by inserting the disk cartridge 14 into the cartridge holder 15, and the elastic force of the torsion spring 23 caused by pulling out the disk cartridge 14 from the cartridge holder 15 causes the shutter opening arm 21 to move. It is configured to close the shutter 13.

Reference numeral 24 denotes a cleaning member for cleaning the lens, which is a lens surface (light emitting surface) 20a of the objective lens 20.
A brush made of, for example, nylon (trade name) or the like set to have a length that contacts with the lens in an exposed state and is separated from the surface of the cover 19, and is attached to the end of the shutter opening arm 21 on the side of the pivotal support. ing. And
The cleaning member 24 is configured to clean the lens surface 20a of the objective lens 20 by moving the shutter opening arm 21 at the time of ejection.

Reference numeral 25 in the figure is dust.

In the optical disc player having such a structure, when the objective lens 20 is exposed to the outside of the cover 19 at the time of ejection, the shutter opening arm 21 is rotated to move the cleaning member 24 only on the lens surface 20a of the objective lens 20. Can be contacted.

Therefore, in this embodiment, unlike the conventional case, a part of the cleaning member 24 does not come into contact with the surface of the cover 19 at the time of cleaning the lens, so that dust can be prevented from entering the cover 19 by the cleaning member 24. it can.

Next, the operation of the cleaning member 24 in cleaning the lens in this embodiment will be described with reference to FIGS.
An explanation will be given using (C).

First, when the eject button (not shown) is operated after the reproduction is finished, the shutter opening arm 21 rotates in the closing direction of the shutter 13 from the position shown in FIG. As shown, the objective lens 20 rises from the inside of the cover 19 and is exposed to the outside of the cover 19. Next, the cleaning member 24 comes into contact with the lens surface 20a of the objective lens 20 to remove dust 25 on the lens surface 20a as shown in FIG.

In this way, the objective lens 20 can be cleaned at the time of ejecting.

Incidentally, the loading operation of the optical disc player in this embodiment is performed by the cartridge holder 15
This is done by inserting the disk cartridge 14 into the inside.

That is, when the disc cartridge 14 is inserted into the cartridge holder 15, the cartridge holder 15 moves from the cartridge insertion position to the cartridge loading position, and the disc cartridge 14
Is positioned in the housing 11 by a positioning pin (not shown), and the disk 14a of the disk cartridge 14 is attracted onto the turntable 16.

After that, when the reproducing operation is started, the disc 14a of the disc cartridge 14 is turned on by the turntable 1.
While rotating together with 6, the optical pickup device 17 moves to a predetermined position on the disk 14a. Then, the laser beam emitted from the light source (not shown) is reflected by the light reflector 1.
When reflected at 8, the reflected light passes through the objective lens 20 and is incident on the signal recording surface of the disk 14a, and the recording signal is read by detecting the return light.

Although the cleaning member 24 is made of a chemically synthetic fiber such as nylon (trade name) in the present embodiment, the present invention is not limited to this and other fibers may be used. Of course, it may be a cleaning member made of a material.

In addition, the present invention is not limited to the above-described embodiments, but various effective modifications and changes can be made based on the technical idea of the present invention.

[0036]

As described above, according to the present invention, a housing in which a disk cartridge with a shutter can be inserted / removed, a cover that is provided in the housing so as to be movable back and forth, and has a built-in light reflector, and the inside and outside of the cover. An optical pickup device having an objective lens that can be retracted into and out of the optical pickup device, and an arm with a cleaning member for lens cleaning that is reciprocally provided outside the cover of the optical pickup device and that opens a shutter by inserting a disk cartridge. Since the cleaning member of 1 is formed by a cleaning member having a length that contacts the objective lens in the lens exposed state, when the objective lens is exposed outside the cover,
By the operation of the shutter opening arm, the cleaning member can be brought into contact with only the lens surface of the objective lens.

Therefore, unlike the conventional case, a part of the cleaning member does not come into contact with the surface of the cover at the time of cleaning the lens, so that the dust can be prevented from entering the cover by the cleaning member, and the dust on the light reflector inside the cover can be prevented. It is possible to prevent the occurrence of adhesion.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an optical disc player according to the present invention.

FIG. 2 is a plan view schematically showing the entire optical disc player according to the present invention.

FIG. 3 is a flowchart for explaining a lens raising / lowering operation associated with an ejecting operation of the optical disc player according to the present invention.

4A to 4C are cross-sectional views shown for explaining an operation at the time of lens cleaning by the cleaning member of the optical disc player according to the present invention.

5A to 5C are cross-sectional views shown for explaining an operation of cleaning a lens by a cleaning member of a conventional optical disc player.

[Explanation of symbols]

 Reference numeral 11 ... Housing 13 ... Shutter 14 ... Disk cartridge 17 ... Optical pickup device 18 ... Light reflector 19 ... Cover 20 ... Objective lens 20a ... Lens surface 21 ... Shutter release arm 24 ... Cleaning member

Claims (1)

[Claims] 1. An optical pickup device having a housing into which a disk cartridge with a shutter can be inserted / removed, a cover that is provided in the housing so as to be able to move forward and backward, and has a built-in light reflector, and an objective lens that can appear inside and outside the cover. When,
An arm with a lens cleaning cleaning member that is reciprocally provided outside the cover of the optical pickup device and that opens the shutter when the disc cartridge is inserted;
An optical disc player formed by a cleaning member having a length that contacts the objective lens when the lens is exposed.