JPH10208461A - Disc device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc device by which protect an object lens, etc., from contaminated air even if the object lens is consistently exposed as in the case of a navigation device which is used at all times while a car is driven. SOLUTION: After a unit chassis 23 in which a clamping member 27, a spindle motor 28, an optical head 30 on which an object lens 29 is mounted, etc., are housed is covered with a dust-proof case 20 with the high airtightness, the case 20 is incorporated in a housing 21. As the unit chassis 23 is shut off from contaminated outside air by the dust-proof case 20, the object lens 29 is not brought into direct contact with dust and dirt such as smoke of cigarettes and is hardly contaminated. Further, if a circuit board 24 on which a heat generating unit such as a driving circuit is provided outside the dust-proof case 20, the temperature rise in the dust-proof case 20 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a vehicle, such as an in-vehicle audio device or a navigation device.
The present invention relates to a disk device on which a CD, a CD-ROM, a DVD, an MD, etc. are loaded, and more particularly to a disk device capable of preventing an objective lens of an optical head from being stained.

[0002]

2. Description of the Related Art FIG. 2 is a side sectional view showing a conventional on-vehicle disk device used as an audio device or a navigation device, and FIG. 3 is a perspective view showing an external appearance of a unit chassis provided in FIG. FIG. This disk drive
It is 1 DIN size, and has a housing 1 and an operation panel 2 on the front surface thereof. Inside the housing 1, a unit chassis 3 and a circuit board 4 are provided. For example, the circuit board 4 is installed in an opening 3 a formed in a bottom plate of the unit chassis 3. Inside the unit chassis 3, a disk rotation mechanism such as a disk transport mechanism 5, a turntable 6, a clamp mechanism 7, and a spindle motor 8, a detection system member having an optical head 10 on which an objective lens 9 is mounted, and the like are housed. I have. On the circuit board 4, a drive driver 11 for the spindle motor 8, a drive driver for sliding the optical head, a focus servo and tracking servo control circuit, and the like are configured.

[0003] A guide member (not shown) is provided in the unit chassis 3 so that the optical head 10 can move in the radial direction of the disk D along the guide member. The disk D is clamped by the turntable 6 and the clamp mechanism 7 and is driven to rotate. The detection beam emitted from the light emitting element of the optical head 10 is focused by the objective lens 9 and irradiated on the recording surface of the disk D. Returns to the optical head 10 via the objective lens 9, is detected by the detection optical system in the optical head 10, and the information recorded on the disk D is read. The operation panel 2 has a disc insertion slot 2
a, a display device, a disc carrying button, etc., and operation buttons for music selection, sound quality adjustment, volume adjustment for audio equipment, or various operation buttons for navigation operation are provided. When used for mounting on a vehicle, the housing 1 is embedded in a predetermined position such as a dashboard in the vehicle, and only the operation panel 2 is exposed.

[0004]

In this type of disk drive, the structure of the unit chassis 3 is provided with various mechanisms as shown in FIG. 3, but the outer shape has many openings and the inside is shielded. It is not structured. Further, the circuit board 4 shown in FIG. 2 and other circuit boards are housed in the housing 1, and circuit components such as ICs mounted on these circuit boards generate heat, so that the housing 1 has a sealed structure. In this case, the housing 1 has many holes for circulating air inside and outside. Therefore, dust and dirt generated outside the housing 1 easily enter the inside of the housing 1 and further easily enter the inside of the unit chassis 3. When a large amount of these dusts and dust adhere to the objective lens 9 of the optical head 10,
The detection beam passing through the objective lens 9 and the return light from the disk D are blocked, and a reading error of a signal recorded on the disk D is likely to occur.

Conventionally, as a countermeasure, a method of providing a lens shutter on an objective lens and closing the lens shutter when not in use, a structure of providing a lens cleaning device to sequentially clean the objective lens, and the like have been adopted. . However, lens shutters, lens cleaning devices, and the like tend to be costly because of their complicated mechanisms. Also, audio equipment such as a CD player may not be used during driving of the car, so that the lens shutter can be closed or the lens cleaning device can be operated while the operation is stopped. It can be used effectively. However, when a CD-ROM or the like is loaded in the disk device shown in FIG. 2 and is used for reading out map information or the like in a navigation device, it is generally used for a long time during driving. There is little intervening operation stop time like equipment. Therefore, even if a lens shutter and a lens cleaning device are provided, they cannot be used most of the time, so that these measures cannot be used effectively, and a large amount of dust or dust adheres to the objective lens 9. It will be easier.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. Even if an objective lens is always exposed, such as a navigation device used as needed while driving a car, dirty air can be obtained. It is an object of the present invention to provide a disk device capable of protecting an objective lens and the like from a disk drive.

[0007]

A disk drive according to the present invention has a housing and a panel covering a front surface of the housing.
Inside the casing, a disk transport mechanism, a unit chassis mounted with a disk rotation drive mechanism and an optical head, and a circuit board mounted with a control circuit for controlling each mechanism provided in the unit chassis are provided, The unit chassis is housed in a dustproof case provided inside a housing.

In the above, the circuit board is arranged outside the dustproof case, and each mechanism mounted on a unit chassis in the dustproof case is connected to the circuit board by a wiring member passing through the dustproof case. Is preferred.

For example, the opening of the dustproof case is joined to the back of the panel, the disk insertion opening formed in the panel communicates with the inside of the dustproof case, and the disk inserted from the disk insertion opening is inserted into the dustproof case. Can be loaded in the unit chassis.

[0010] Further, it is preferable that a disk insertion opening formed in the panel is covered with a soft dustproof sheet which is deformed as the disk passes.

According to the present invention, the inside of the low-sealing case (first case) in which the hole for circulating the air inside and outside is open is hardly opened in the case (the first case) and the case is more sealed than the case. A highly dustproof case (second case) is provided, and the unit chassis is housed in the dustproof case. An opening for guiding a disc is formed in the dust-proof case, and the opening is closely attached to an inner surface of a panel provided on a front surface of the housing, and a disc insertion formed in the panel is inserted. The mouth is configured to communicate with the dustproof case. More preferably, the disk insertion opening formed in the panel is covered with a soft dustproof sheet that allows the disk to pass.

With such a configuration, the inside of the dustproof case communicates with the outside of the housing almost only by the disc insertion port, and the disc insertion port is closed by the dustproof sheet. Therefore, it becomes difficult for dirty air in the vehicle interior or the like, for example, air including dust of cigarettes, dust and dust to enter the unit case, and the objective lens of the optical head is hardly stained.

Therefore, even if a lens shutter or a lens cleaning device is not provided, it is possible to prevent the accuracy of reading signals recorded on the disc from being lowered due to contamination of the objective lens.

Although the unit chassis is covered with the dust-proof case, the various circuit boards in the case are not covered with the dust-proof case. Can escape to the outside, and the inside of the housing does not become abnormally high temperature.

Further, as shown in FIG. 2, when the circuit board 4 is integrally provided on the unit chassis, and when the circuit board is composed of circuit components having a small amount of heat generation, this circuit board is also used. It may be stored in a dustproof case,
When the circuit components mounted on the circuit board are mounted with a large amount of heat, for example, a drive driver 11 for a spindle motor, it is preferable to dispose the circuit board outside the dustproof case. By providing the circuit board having the circuit components that generate a large amount of heat outside the dustproof case, it is possible to prevent the temperature inside the dustproof case from increasing.

In this case, various mechanisms inside the dustproof case and the circuit board are connected by a flexible board or the like.
The flexible substrate is configured to be inserted through a slit formed in the dustproof case with a minimum gap. Alternatively, a connector having terminals exposed to the inside and outside may be fixed to the dustproof case, and wiring from a mechanism provided in the dustproof case and wiring from an external circuit board may be conducted through the connector.

Further, the dustproof case is preferably box-shaped formed of a metal plate or a resin, and is preferably formed so as not to form holes as much as possible.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of a disk drive according to the present invention. In FIG.
A symbol A indicates a disk device, for example, a size of 1 DIN size. The disk device A is provided with a housing 21 (first case), and a front surface thereof is provided with a panel 22 serving as an operation surface for operating the disk device A. The panel 22 is formed of resin or the like, has an opening for a disk insertion slot 22a, and is further provided with various operation buttons, a display device, and the like. When the disk device A is mounted on a vehicle, the casing 21 is embedded in the dashboard of the vehicle, and only the panel 22 is exposed in the vehicle.

A unit chassis 23 is provided inside the disk device A. This unit chassis 23
Is a CD-RO used for a navigation device, for example.
An M playback player and the like are configured. A pedestal 32 elastically supported by a spring S or the like is provided in the unit chassis 23. The pedestal 32 has a spindle motor 28 constituting a disk rotation drive mechanism and a turntable fixed to a support shaft 28a thereof. 26, a transport roller 25 constituting a disk transport mechanism, a clamp member 27 for clamping the disk, and the like.

An optical head 30 is provided below the pedestal 32 so as to be movable in the X-axis direction in the figure along the radial direction of the disk D. The optical head 30 is a pedestal 32
The base 32 is provided with a thread motor (not shown) for moving the optical head 30. The optical head 30 is provided with an objective lens 29 facing the disk D, and a detection beam such as a laser emitted from a light emitting element in the optical head 30 is focused by the objective lens 29 and irradiated on the recording surface of the disk D. , The return light reflected by the recording surface of the disk D passes through the objective lens 29,
The light is detected by a light receiving element via a detection optical system in the optical head 30.

The unit chassis 23 is housed in a dustproof case 20, which is a second case provided inside the housing 21. The dustproof case 20 may be, for example, a thin metal plate formed by drawing or a resin molded product. Dustproof case 20
Is composed of, for example, an upper case 20a and a bottom case 20b as shown in FIG. An opening 20a1 through which the disk D passes is formed in the upper case 20a. The front portion of the dustproof case 20 is in close contact with the rear surface of the panel 22, and the opening 20 a 1 is inserted through a disc insertion opening 22 a formed in the panel 22. Alternatively, when the dustproof case 20 is formed of resin, the portion of the upper case 20a where the opening 20a1 is formed may be integrated with the panel 22. That is, panel 2
It is preferable that no gap is formed between at least the portion where the disc insertion opening 22a is formed and the opening 20a1 of the upper case 20a so that dust can enter.

The upper case 20a and the bottom case 20b are
For example, the upper case 20a is overlaid on the bottom case 20b and fixed by screws. At the bottom case 20b, a plurality of mounting holes for fixing the dustproof case 20 to the housing 21 and a plurality of mounting holes for fixing the unit chassis 23 to the dustproof case 20 are formed.
As shown in FIG. 2, the number of mounting holes formed in the dust-proof case 20 can be reduced by overlapping the mounting holes so that they can be tightened together. The degree of sealing can be increased.

Further, as shown in FIG.
A circuit board 24 is provided outside the housing and inside the housing 21. In FIG. 1, the circuit board 24 is a bottom case 20b.
And the bottom plate of the housing 21, but the present invention is not limited to this.
It is also possible to provide between the “a” and the ceiling plate of the housing 21. On the circuit board 24, a drive driver circuit for driving the spindle motor 28, the optical head 30, the focus and tracking control means and the like are formed. The circuit board 24 and each mechanism inside the dustproof case 20, that is, the spindle motor 28, the optical head 30, the focus and tracking control means, etc., pass through a through hole 20b1 formed in the bottom case 20b with a minimum gap. Electrically connected via a wiring member such as a flexible cable 31.

As shown in FIG. 1, the disc insertion opening 22a formed in the panel 22 has a dustproof sheet (wiping sheet) made of a soft sheet such as felt.
22b. The dustproof sheet 22b is composed of two sheets, an upper part and a lower part, and a part thereof is overlapped in the Y-axis direction near the center of the disk insertion slot 22a. The dustproof sheet 22b covers and hides the inside of the housing 21 so that the inside of the housing 21 cannot be seen from the opened disc insertion opening 22a, and also blocks invasion of dust and dust. In the disc device A, the disc D is inserted into the disc insertion slot 22a from the right end in FIG. The disc D is pushed and opened to deform the dustproof sheet 22b, and the dust and dust adhering to the disc D are wiped off.
After passing through Oa1, it is nipped by the transport roller 25 in the unit chassis 23. Then, it is placed on a turntable 26 by the feed force of the transport roller 25, clamped by a clamp member 27, and given a predetermined rotation by a spindle motor 28. After the rotation of the disk D, a detection beam is emitted from the objective lens 29 while the optical head 30 slides in the X-axis direction in the figure, and the reflected light from the disk D passes through the objective lens 29 again and the light receiving element in the optical head 30 And the information recorded on the disk D is read.

In the disk drive A, the objective lens 2 mounted on the optical head 30 on the unit chassis 23
9 is isolated from other areas in the housing 21 by a highly sealed dustproof case 20, so that dirty air including tobacco smoke, dust, dust, and the like hardly enter the unit chassis 23. These are less likely to adhere to the objective lens 29.
In addition, the heat generating portion such as a drive driver among the circuit components provided on the circuit board 24 is provided outside the dustproof case 20, that is, the dustproof case 20 which allows relatively easy ventilation of air from outside the housing 21. Because it is installed between the body 21
The temperature inside the housing 21 and the temperature inside the dustproof case 20 do not rise. If the circuit board 24 is provided between the upper case 20a and the ceiling plate of the housing 21 as described above, the air heated by the circuit components escapes directly from the hole formed in the ceiling plate of the housing 21. Thus, the temperature rise in the dustproof case 20 and the housing 21 can be further reduced.

Therefore, since the surface of the objective lens 29 provided inside the dustproof case 20 does not directly come into contact with dirty air such as cigarette smoke, the objective lens 29 can be protected from dust and the like. And the objective lens 29 is less likely to be soiled. Therefore, even if the disk device is always used, such as a navigation device, the information on the disk D can always be reliably detected. Further, since the disk D is driven inside the dustproof case 20 having a high degree of sealing, it is possible to protect the disk D itself, thereby preventing dust from adhering to the surface of the disk D.

Further, since the above simple dust-proof case is merely attached, a complicated mechanism such as a lens shutter or a cleaning device is not required, and the cost can be reduced. In addition, an auxiliary member such as rubber is provided around the through hole 20b1 formed in the bottom case 20b through which the flexible cable is inserted, so that the degree of adhesion between the through hole 20b1 and the flexible cable is increased. Accordingly, dust entering from the through hole 20b1 can be prevented.

[0028]

According to the present invention described in detail above, dust and the like can be prevented from adhering to the surface of the objective lens on the optical head. Almost gone. Therefore, it is possible to always detect the disk information in a good state.

Further, even if the disk is left in the dustproof case for a long time, the surface of the disk itself is hardly stained because the sealing degree of the dustproof case is high.

Since the contamination in the unit chassis can be prevented with a simpler structure, the cost can be reduced.

By arranging the circuit board outside the dustproof case, it is possible to prevent a rise in temperature due to heat generated from circuit components provided on the circuit board.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a disk device according to the present invention;

FIG. 2 is a side sectional view showing a conventional disk device;

FIG. 3 is a perspective view showing the appearance of a unit chassis provided inside FIG. 2;

[Explanation of symbols]

 Reference Signs List 20 dustproof case (second case) 21 housing (first case) 22 panel 22a disk insertion slot 23 unit chassis 24 circuit board 25 transport roller 26 turntable 27 clamp member 28 spindle motor 29 objective lens 30 optical head

Claims (4)

[Claims] 1. A unit chassis having a housing and a panel covering a front surface of the housing, and a unit chassis having a disk transport mechanism, a disk rotation drive mechanism, and an optical head mounted inside the housing, and the unit chassis A circuit board mounted with a control circuit for controlling each mechanism provided in the
A disk device, wherein the unit chassis is housed in a dustproof case provided inside the housing. 2. The circuit board is disposed outside a dust-proof case, and each mechanism mounted on a unit chassis in the dust-proof case is connected to the circuit board by a wiring member passing through the dust-proof case. The disk device according to claim 1. 3. An opening of the dust-proof case is joined to the back of the panel, a disk insertion opening formed in the panel communicates with the inside of the dust-proof case, and a disk inserted from the disk insertion opening is inside the dust-proof case. 3. The disk device according to claim 1, wherein the disk device can be loaded in a unit chassis. 4. A disk insertion opening formed in the panel,
4. The disk device according to claim 3, wherein the disk device is covered with a soft dust-proof sheet that deforms as the disk passes.