JP2002304878A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize lengthening a lifetime of a laser and improving reliability of a device by suppressing temperature rise of the inside of a device caused by heat generated by a movable laser section and heat generated in a disk motor and an integrated circuit. SOLUTION: Liquid ceramic is applied to nearness of a laser element being a main heating part of a disk device, a disk motor, an integrated circuit, a top plate positioned at a position opposing to them, a top cover constituting a device case, a bottom cover, a chassis, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device which uses a disk-shaped medium such as an optical disk or a magneto-optical disk to record and / or reproduce information on / from a disk by laser light emitted from a laser element.

[0002]

2. Description of the Related Art In an optical disk apparatus for performing recording and / or reproduction on an optical disk as a medium, a laser beam emitted from a laser element is usually used to write information on the disk or to read information from the disk. ing. In the case of an optical disk device, components that generate heat during operation by application of electric power mainly include a laser element, a disk motor, and an integrated circuit on a circuit board.

The laser element itself generates heat during operation of the optical disk apparatus, and is heated by the heat of the disk motor or the circuit board to further increase the temperature around the laser element. The performance of the laser element is temperature dependent,
An increase in the ambient temperature may cause instability of laser emission or shorten the life of the laser element, which may cause a decrease in the reliability of the optical disk apparatus as a whole. Therefore, in these optical disk devices, how to efficiently remove the heat generated by the laser element, disk motor, and circuit board is an important issue in order to avoid the shortening of the life of the laser element and ensure operational reliability. Becomes

[0004] In particular, the laser element portion has
It is very difficult to efficiently transfer the heat generated by the movable laser element to other parts by heat conduction and heat transfer because the position is moved according to the position of the signal on the disk surface where the data is exchanged. Met.

Further, in recent years, not only information can be read but also a signal can be recorded on a disk, and a high-density type disk has begun to spread on the disk. The rise in internal temperature is a major issue to be solved.

[0006] Japanese Patent Application Laid-Open No. H10-31678 discloses an example of a method for cooling the entire optical disk device. According to this method, both the circuit board and the mechanical block including the laser element and the disk motor can be cooled by introducing outside air by a fan. However, since the laser element and the disc in the mechanical block dislike dust, outside air is not introduced into the mechanical block. In addition, there is no specific description about a solution for heat generated in the laser element portion, and outside air is introduced between the circuit board and the mechanical block in order to further increase the life of the laser and ensure high reliability. Even the cooling method may still be insufficient.

Here, as an invention for improving the heat absorbing property and the heat dissipating property of the housing of an electronic device, Japanese Patent Application Laid-Open No.
-34039 is known. According to the present invention, for example, ceramic particles are applied to the housing of the electronic device,
It describes how to radiate the heat of equipment to the outside by heat radiation. However, since the heat source is not the housing itself, it is necessary to consider the heat transfer of the heat source in order to move the heat more efficiently.

In addition, the generation of charging in the disk device has been one of the causes of minute dust and dirt adhering to a disk, a pickup, and a circuit board, thereby lowering reliability.

[0009]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 10-31 is disclosed.
In the conventional example disclosed in Japanese Patent No. 2678, cooling of the inside of the mechanical block is not performed as described above. Further, according to the structure of this conventional example, the mechanical block is arranged on the upper side of the circuit board, and the mechanical block is heated by heat generated on the circuit board. As described above, the performance of the laser element in the mechanical block may be reduced due to an increase in the ambient temperature. Therefore, according to this conventional example, air is passed through a part of the optical disk device to cool the circuit board, and a gloss material is provided on the circuit board side under the mechanical block to minimize heat transfer to the inside of the mechanical block. Such a structure corresponds to suppression of excessive temperature rise in the device.
However, according to the method of the conventional example, there is no description about suppressing the temperature rise inside the mechanical block, and the temperature inside the mechanical block still rises due to the heat generated by the laser element and the disk motor, and the laser element May have an adverse effect on the life and reliability of the device.
In addition, since it is necessary to avoid dust and dirt from the outside inside the mechanical block, it is desirable to avoid the method of cooling through the outside air as much as possible.

Further, even when ceramic particles are applied to the housing of an electronic device to promote the transfer of heat as disclosed in JP-A-11-340639, cooling is not performed efficiently because only the optical disk device housing is used. Was.

In view of the above problems, it is an object of the present invention to efficiently move heat not only in a movable laser element having a large amount of heat but also in a disk motor or a circuit board which also generates a large amount of heat. Suppresses temperature rise in the laser element, disk motor and circuit board,
It is another object of the present invention to provide a disk device which achieves a long service life of these components, prevents electrification of the disk and the inside of the device, and has excellent reliability.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a disk motor for rotating a disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element. An optical system that focuses the laser light on the information recording surface of the disk and irradiates a light receiving element with light reflected by the information recording surface, and a control system that controls operations of the disk motor and / or the laser element, and Alternatively, there is provided a disk device having a circuit board having a signal processing system for processing a signal obtained from light received by the light receiving element, wherein liquid ceramic is applied around the laser holder.

[0013] Alternatively, a disk motor for rotating and driving the disk, a laser element, a laser holder for holding the laser element, and a laser beam radiated from the laser element are condensed on an information recording surface of the disk to obtain information. An optical system that irradiates the light receiving element with light reflected on the recording surface,
A chassis provided with the disk motor and / or the optical system, a control system for controlling operations of the disk motor and / or a laser element, and / or a signal processing system for processing a signal obtained from light received by the light receiving element. And a circuit board having the circuit board, wherein a liquid ceramic is applied to at least a part of a surface of the chassis.

Alternatively, a disk motor for rotating and driving the disk, a laser element, a laser holder for holding the laser element, and a laser beam radiated from the laser element are focused on an information recording surface of the disk. An optical system that irradiates a light receiving element with light reflected on the information recording surface, the disk motor and / or a plate disposed around the optical system, and a control system that controls operations of the disk motor and / or the laser element, and Alternatively, the disk device includes a circuit board provided with a signal processing system for processing a signal obtained from light received by the light receiving element, wherein a liquid ceramic is applied to at least a part of the plate surface.

Alternatively, a disk motor for rotating and driving the disk, a laser element, a laser holder for holding the laser element, and a laser beam radiated from the laser element are focused on an information recording surface of the disk. An optical system for irradiating the light receiving element with light reflected on the information recording surface, a control system for controlling operations of the disk motor and / or the laser element, and / or a signal for processing a signal obtained from the light received by the light receiving element What is claimed is: 1. A disk drive comprising: a circuit board provided with a processing system, wherein a liquid ceramic is applied to a surface on the circuit board.

Alternatively, a disk motor having a rotor for driving the disk to rotate, a laser element, a laser holder for holding the laser element, and collecting laser light emitted from the laser element on an information recording surface of the disk. Light, an optical system for irradiating the light receiving element with light reflected on the information recording surface, a control system for controlling the operation of the disc motor and / or the laser element, and / or a signal obtained from the light received by the light receiving element. A disk substrate comprising a circuit board having a signal processing system for processing, wherein liquid ceramic is applied to a surface of a rotor portion of the disk motor.

Alternatively, a disk motor having a rotor for driving the disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element are collected on an information recording surface of the disk. And an optical system for irradiating the light receiving element with light reflected on the information recording surface, a chassis in which the disk motor and / or the optical system are arranged, and an outer housing that includes them and forms a part of a device housing and / or A plate disposed around the disk motor and / or the optical system, a control system for controlling the operations of the disk motor and the laser element, and / or an integrated circuit for processing a signal obtained from light received by the light receiving element And a circuit board provided with a signal processing system according to (1), wherein the periphery of the laser element and / or the shear At least a portion of the surface and or at least a portion of the plate surface and or,
Liquid ceramic is applied to a part of the circuit board surface and / or the surface of the rotor portion of the disk motor, and further, a position facing the laser element, and / or a position facing the chassis surface, and / or the circuit board A component that constitutes any one of the laser holder, the chassis, the plate, the circuit board, and the rotor unit of the disk motor at a position facing the disk unit and / or a position facing the rotor unit of the disk motor. And / or apply liquid ceramic to the surface of the outer casing.

At this time, a degreasing step is performed in advance on the surface of the component on which the liquid ceramic is to be applied or on the surface on which the liquid ceramic is to be applied on the component and / or the outer casing facing the component.

Further, the surface of the component to which the liquid ceramic is applied, or the component and / or the housing facing the component are further subjected to a blackening treatment.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 showing an embodiment applied to a DVD-RAM drive device capable of recording and reproducing information on a disk by using one of optical disk devices. This will be described with reference to FIG. FIG. 1 is an exploded perspective view of an optical disk device to which the present invention is applied, and FIG. 2 is a side view of the optical disk device to which the present invention is applied.

FIG. 1 is a schematic exploded perspective view of an entire optical disk apparatus (hereinafter, referred to as an apparatus) of the present invention. In FIG. 1, reference numeral 1 denotes a disk cartridge,
a, a cartridge body 1b including the disk body 1a, and an openable / closable shutter 1c. Reference numeral 2 denotes a tray for carrying the disk cartridge 1 in and out of the apparatus, and reference numeral 3 denotes a tray for mounting and holding a disk body (hereinafter simply referred to as a disk) 1a when the disk cartridge 1 is moved to a predetermined position by the tray 2. When the disc cartridge 1 is moved to a predetermined position by the tray 2, the turntable 4 and the disc 1 a are rotated.
And a top plate 5 having a mechanism for holding and positioning the clamper 3 and for opening and closing the shutter 1c in the cartridge body 1b (not shown). Reference numeral 6 denotes a pickup having a built-in optical system for recording and reproducing information on and from the disk 1a, reference numeral 6c denotes a laser holder holding a laser element (not shown), and reference numeral 6d denotes a radiation fin formed on the laser holder. In the embodiment of the present invention, an example will be described in which the laser holder 6c is configured to be integrally combined with the pickup 6. Further, in the apparatus to which the present invention is applied, the pickup 6 is of a type in which the position is slid according to the position of a signal on a disc to be exchanged. Further, the apparatus described in the present embodiment can be operated by placing the disk 1a directly on the tray, but in the present description, the case where the disk cartridge 1 using the cartridge body 1b including the disk 1a is used. Will be described.

Reference numerals 7a and 7b denote guide bars serving as tracks for moving the pickup 6 for exchanging signals with the disk 1a. Reference numeral 8 denotes a flexible pattern circuit (X) for exchanging signals between the pickup 6 and a circuit board described later. Hereinafter, FPC), 16 is a disk motor for rotating the turntable 3, 17 is a mechanical chassis on which the disk motor 16 and the pickup 6 are mounted,
Reference numeral 20 denotes a mechanical base on which the mechanical chassis 17 and the top plate 5 are mounted.

Here, in the mechanical chassis 17, a portion which stands substantially vertically on the laser holder side is denoted by 17a.
Similarly, a portion of the mechanical chassis 17 that rises substantially perpendicularly to the disk motor side is defined as 17b.

Reference numeral 30 denotes a circuit board provided with a control and a signal processing system for the disk motor 16 and the pickup 6 on the unit mechanism 17, and 31a, 31b, 31c, 31d, and 31e denote integrated circuits constituting a part of the circuit board. Here, an integrated circuit that generates heat particularly during operation of the device is shown. Reference numeral 30b denotes a connector portion for signal transmission provided on the circuit board 30. One end of the FPC 8 connected to the pickup 6 is inserted into the connector portion 30b and electrically connected to the circuit board 30.
It has a structure to connect with. A connector 30c for driving the disk motor 16 has a structure in which one end of a disk motor FPC (not shown) is inserted to exchange power and a rotation control signal from the circuit board 30.

Reference numerals 32 and 33 denote a top cover and a bottom cover, respectively, which form part of the outer casing of the apparatus. Reference numeral 34 denotes a front panel which is located on the insertion direction side of the disk cartridge 1 and forms a part of the exterior of the apparatus. Reference numeral 34a denotes a front door which opens and closes when the disk cartridge 1 is carried in and out of the apparatus by the tray 2.

FIG. 2 shows an embodiment of the present invention viewed from the side of the apparatus for explanation. Reference numeral 1a denotes a disk, and 1b denotes a cartridge main body including the disk 1a, and constitutes a disk cartridge 1 together with a shutter (not shown). Reference numeral 2 denotes a tray for loading and unloading the disk cartridge 1 into and out of the apparatus. Reference numeral 3 denotes a turntable for loading and holding and rotating the disk 1a when the disk cartridge 1 is moved to a predetermined position by the tray 2.
Is the disk 1a in the disk cartridge 1 is the tray 2
The clamper 5 holds the disc 1a in the form of being sandwiched when the disc 1a is moved to a predetermined position, and the top plate 5 is provided with the clamper 4 and a shutter opening / closing mechanism (not shown) (not shown) provided in the cartridge body 1b. 6 is a pickup, 6c is a laser holder holding a laser element (not shown) therein, and 6d is a radiation fin formed on the laser holder 6c. In the present embodiment, an example is described in which the pickup 6 and the laser holder 6c are integrally combined as described above. Reference numeral 16 denotes a disk motor for rotating the turntable 3, and 16r denotes a rotor of the disk motor 16. Reference numeral 30 denotes a circuit board that controls the apparatus, for example, controls the pickup 6 and the disk motor 16, and 30b denotes a connector on the circuit board.

Reference numeral 8 denotes an FPC for exchanging signals with the pickup 6 via a connector 30b on the rotary board 30.

9 is the spindle motor 16 and the circuit board 30
This is an FPC that exchanges power and control signals with the FPC via the connector 30c. Also, on the circuit board 31a,
Reference numerals 31b and 31c denote integrated circuits on a circuit board, particularly those which generate heat during operation of the apparatus. Reference numeral 20 denotes a mechanical base on which the mechanical chassis 17 and the top plate 5 are mounted.

In FIG. 2, the portions indicated by thick lines are portions where the liquid ceramic 50 is applied to the surface of each member. In addition, in FIG. 2, the main part to which the liquid ceramic is applied is also shown with a partially enlarged view by a lead line for explanation.

In the embodiment of the present invention, the main parts to which the liquid ceramic 50 is applied are a laser holder 6c which is a main heat source during operation of the apparatus, a pickup 6 integrated with the laser holder 6c, a radiation fin 6d, The rotor 16r of the disk motor 16, the mechanical chassis 17, the top plate 5, and the integrated circuits 31a and 31 on the circuit board 30
At least one or more combinations of b and 31c, or a combination with a top cover 32 and / or a bottom cover 33 which is an outer casing of the apparatus. In particular, when the pickup 6 and the laser holder 6c are movable as shown in the embodiment of the present invention, it is extremely difficult to radiate heat to the outside of the apparatus by heat conduction and heat transfer via a good heat conductor or the like.

Here, the liquid ceramic will be described.
When a liquid ceramic is applied to a base material using a metal alkoxide-based or aqueous silicate-based coating agent as a base material, fine particles of silica, alumina, and titania, which carry metal ions, constitute a film. Liquid ceramic can be easily applied by spraying, roller or brush coating, and when dried, adheres to the member and turns into a ceramic.

When the liquid ceramic is applied to and fixed on the heat generating portion, there is an effect that heat is transferred from the heat generating portion as energy by radiation. In general, the property that heat is easily radiated to the outside also has the property that heat is easily absorbed, and a member coated with liquid ceramic is no exception. Therefore, not only the liquid ceramic is applied to the heat generating portion in the apparatus, but also the surface facing the heat generating portion, for example, the surface facing the rising portion 17a of the mechanical chassis 17 or the top plate as the portion facing the laser holder 6d in the present embodiment. 5 or on the rising portion 17b of the mechanical chassis 17 at a position facing the rotor portion 16r of the disk motor 16. In addition, an integrated circuit 3 having a large heat value
The liquid ceramic 50 is applied to the surface of the bottom cover 33 not only at 1a, 31b, and 31c but also at a position facing them. By doing so, the radiation of heat from the heat generating portion is promoted inside the device, so that the temperature distribution of each portion is averaged, and it is possible to prevent a local rise in temperature.

As described above, when the liquid ceramic is applied and fixed, it generally has the effect of transferring heat as energy from the heat generating portion by radiation, and the property of easily radiating heat to the outside is that it absorbs heat. It also has the property of being easy to do. Utilizing the characteristics of the liquid ceramic, when the liquid ceramic is applied to the heat generating portion as in the present embodiment, heat radiation is promoted and not only can the temperature at the heat generating portion be lowered, but also the heat generating portion can be heated. By applying the liquid ceramic to the surface of the opposing device component, the heat energy radiated from the heat-generating part is easily absorbed, so that the heat generated by the heat-generating part is compared with the case where the liquid ceramic is applied only to the heat-generating part. Radiation is further promoted, and it is possible to further suppress a rise in temperature of the heat generating portion.

At this time, the liquid ceramic is applied to not only the surface facing the heat generating portion but also the other surface (for example, the back surface) of the device constituent member facing the heat generating portion (for example, both the front and back surfaces). Heat can be absorbed on the surface facing the heat generating portion, and heat can be radiated on other surfaces (for example, the back surface), so that the heat can be more efficiently released. If this is described with reference to FIG. 2 as an example, the heat inside the apparatus can be absorbed by the inner surface of the top cover 32 and the heat can be released from the outer surface of the top cover 32.

As described above, the top cover 32, which is the outer casing of the apparatus, receives the radiation of the heat generated in the heat generating portion inside the apparatus by applying the liquid ceramic, and removes the heat inside the apparatus whose temperature has risen as a whole. There is an effect of radiating heat from the top cover 32 having a large surface area to the outside of the apparatus.

At present, liquid ceramics are known to be white or colorless and transparent. However, heat radiation is performed by subjecting the member after liquid ceramic coating to a blackening treatment such as coloring the surface black or the like. The efficiency can be increased, and the radiation of heat inside the device and the heat radiation from the top cover 32 are promoted.

As another effect of applying the liquid ceramic, there is an effect of preventing electrification in the apparatus in addition to the promotion of heat radiation. Needless to say, the optical disk device is an electronic device, and the operation may be stopped in the worst case due to the influence of static electricity or the like. Therefore, in addition to the integrated circuit on the circuit board described in the embodiment of the present invention, a liquid ceramic is applied to a portion of the circuit board that is easily affected by static electricity, thereby realizing a device that is robust against static electricity generation. It becomes possible.

Here, when the liquid ceramic is applied to each member or during the manufacturing process of each member, if the surface on which the liquid ceramic is applied is previously degreased, the liquid ceramic can be applied to the applied member. A good and more stable state of fixing the ceramic can be obtained.

With the structure described above, the laser holder 6c, which generates a large amount of heat in the apparatus, by promoting the heat radiation by the application of the liquid ceramic,
Since it is possible to suppress the temperature rise in the integrated circuit and the spindle motor, it is possible to realize the laser emission, the longevity and stabilization of the spindle motor and the circuit board, and the high reliability of the entire device. It becomes possible.

Further, the effect of the application of the liquid ceramic is not limited to the transfer of heat, but also has the effect of preventing static electricity and removing static electricity. A laser element, a circuit board, and the like in the apparatus are easily affected by adverse effects such as malfunction and destruction due to static electricity. Thus, the generation of static electricity can be suppressed by applying the liquid ceramic, and this effect can also realize a highly reliable device.

In this embodiment, an example in which a DVD-RAM drive is used as an optical disk device has been described. However, a device to which the present invention can be applied is a DVD-R.
Not limited to an AM drive, for example, a CD-R drive, D
It can be applied to a drive that generates a large amount of heat inside the apparatus, such as a VR-R drive. Since the radiation of heat is proportional to the fourth power of the absolute temperature of the heat-generating part, the application of liquid ceramic to the components of the device that generate more heat further promotes the radiation of heat and obtains a large temperature rise suppression effect. Becomes possible.

[0042]

According to the present invention, even in an optical disk device equipped with a movable laser element, the laser element portion, the integrated circuit, and the spindle motor portion, which generate a large amount of heat, can be used in the optical disk device equipped with a movable laser element. Laser emission,
And longer life and stabilization of spindle motors and circuit boards.
As a result, it is possible to realize high reliability of the entire device.

Furthermore, the effect of the application of the liquid ceramic is not limited to the transfer of heat, but also has the effect of preventing static electricity and removing static electricity. A laser element, a circuit board, and the like in the apparatus are easily affected by adverse effects such as malfunction and destruction due to static electricity. Therefore, the generation of static electricity can be suppressed by applying the liquid ceramic, and a more reliable device can be realized by this effect.

[Brief description of the drawings]

FIG. 1 is an explanatory view (schematic perspective view) showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc cartridge, 2 ... Tray, 3 ... Turntable, 4 ... Clamper, 5 ... Top plate, 6 ... Pickup, 6c ... Laser holder, 6d ... Radiation fin, 7a, 7b ... Guide bar, 16 ... Disc motor, 17 ... Mechanical chassis, 20 ... Mechanical base, 30 ... Circuit board, 31a, 31b, 31c, 31d, 31e ... Integrated circuit, 32 ... Top cover, 33 ... Bottom cover, 50 ... Liquid ceramic.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Kuichiro Nagai 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Kenji Sano Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Digital Media Development Division, Hitachi, Ltd.

Claims (8)

[Claims] A disk motor for rotating a disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element condensed on an information recording surface of the disk. An optical system for irradiating the light receiving element with light reflected on the information recording surface, a control system for controlling operations of the disk motor and / or the laser element, and / or a signal for processing a signal obtained from the light received by the light receiving element What is claimed is: 1. A disk device comprising: a circuit board having a processing system, wherein a liquid ceramic is applied around the laser holder. 2. A disk motor for rotating a disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element condensed on an information recording surface of the disk. An optical system for irradiating a light receiving element with light reflected on the information recording surface, a chassis provided with the disk motor and / or the optical system, a control system for controlling operations of the disk motor and / or a laser element, and / or A disk device comprising: a circuit board provided with a signal processing system for processing a signal obtained from light received by a light receiving element, wherein a liquid ceramic is applied to at least a part of a surface of the chassis. 3. A disk motor for rotating a disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element condensed on an information recording surface of the disk. An optical system that irradiates a light receiving element with light reflected on the information recording surface, the disk motor and / or a plate disposed around the optical system, and a control system that controls operations of the disk motor and / or the laser element, and Or a circuit board having a signal processing system for processing a signal obtained from light received by the light receiving element, wherein a liquid ceramic is applied to at least a part of the plate surface. apparatus. 4. A disk motor for rotating and driving a disk, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element being condensed on an information recording surface of the disk to obtain information. An optical system for irradiating the light receiving element with light reflected on the recording surface, a control system for controlling the operation of the disk motor and / or the laser element, and / or an integrated circuit for processing a signal obtained from the light received by the light receiving element And a circuit board provided with a signal processing system such as that described above, wherein a liquid ceramic is applied to a surface of the circuit board. 5. A disk motor having a rotor section for driving a disk to rotate, a laser element, a laser holder for holding the laser element, and collecting laser light emitted from the laser element on an information recording surface of the disk. Light, an optical system for irradiating the light receiving element with light reflected on the information recording surface, a control system for controlling the operation of the disc motor and / or the laser element, and / or a signal obtained from the light received by the light receiving element. What is claimed is: 1. A disk drive comprising: a circuit board having a signal processing system such as an integrated circuit for processing; and a liquid ceramic applied to a surface of a rotor portion of said disk motor. 6. A disk motor having a rotor for driving a disk to rotate, a laser element, a laser holder for holding the laser element, and a laser beam emitted from the laser element being collected on an information recording surface of the disk. And an optical system for irradiating a light-receiving element with light reflected by the information recording surface, a chassis provided with the disk motor and / or the optical system, and an outer housing including them and forming a part of a device housing and A plate disposed around the disk motor and / or the optical system, a control system for controlling the operation of the disk motor and / or the laser element, and / or an integrated circuit for processing a signal obtained from light received by the light receiving element A disk substrate having a circuit board provided with a signal processing system such as a circuit, wherein the periphery of the laser holder and / or the At least a portion of the chassis surface and / or at least a portion of the plate surface and / or the surface of the circuit board and / or the surface of the rotor portion of the disk motor; And / or a position facing the chassis surface, and / or a position facing the circuit board, and / or a position facing the rotor unit of the disk motor,
Liquid ceramic is applied to a surface of the laser holder, the chassis, the plate, the circuit board, a component constituting one of the disk units of the rotor unit of the disk motor, and / or the surface of the outer casing. Disk device. 7. A degreasing step is performed in advance on the surface of the component on which the liquid ceramic is applied or on the component facing the component, and / or on the surface of the outer casing on which the liquid ceramic is applied. 7. The disk device according to claim 1, wherein: 8. The component according to claim 1, wherein the surface of the component coated with the liquid ceramic or the component facing the component and / or the outer casing is further blackened on the surface. The disk device according to claim 6.