JP4893604B2 - Disk drive - Google Patents

Description

  The present invention relates to a disk drive device for reproducing information recorded on a disk such as a CD (Compact Disc) or a DVD (Digital Versatile Disc), and in particular, a signal reading unit that is vulnerable to heat and dust, such as an optical pickup. The present invention relates to a disk drive device having excellent heat dissipation and dustproof performance.

  In order to read information recorded on a disk (such as an optical disk, a magneto-optical disk, or a magnetic disk) as an information recording medium, the disk drive device includes a signal reading unit that moves in the radial direction of the disk. It is known that the performance and life of the reading unit are reduced by heat and dust.

  For example, in an optical pickup, if dust adheres to the focusing objective lens, the laser beam is obstructed by the dust and causes access failure with the disk, and if it is exposed to high temperatures for a long time, it deteriorates in a short period of time. End up. Note that if the casing is sealed to protect the signal reading unit from dust, the heat emitted from the control electronic components will be trapped in the casing, and this type of heating element will be cooled in the casing. If forced ventilation is performed with the outside air flowing in, dust will be allowed to enter the housing.

  Therefore, the housing (case) with a built-in signal reading unit (optical pickup) or the like is made into a sealed structure, and the housing and the control unit are installed in a box-shaped cover with a heat radiating hole formed in the cover. There has been a proposal to provide a blower (for example, Patent Document 1).

  In addition, an air inlet is formed in the top plate of the housing at a position facing the center of the disk, while an air exhaust port is provided on the front side of the housing, and outside air sucked from the air intake port during the rotation of the disk pinches the disk. A disk drive device has been proposed in which the air is discharged from the exhaust port to the outside through the internal space opposite to the side where the pickup is disposed (for example, Patent Document 2).

Japanese Patent Laid-Open No. 4-129084 (upper column on page 6, FIG. 7)

JP-A-2005-243126 (paragraphs 0048 to 0053)

  However, as disclosed in Patent Document 1, the configuration in which the blower is provided in a cover different from the casing having a hermetically sealed structure leads to an increase in the size of the entire apparatus even though dustproof and heat dissipation performance can be improved. There is a problem that the power consumption increases in connection with the driving of the blower and a large noise is generated.

On the other hand, in Patent Document 2, the intake port and the exhaust port are provided so as to face the internal space opposite to the side where the pickup is disposed with the disc interposed therebetween, but the pickup is located between the intake port and the exhaust port. Therefore, there is a high risk that the pickup will be exposed to the air flow from the intake port to the exhaust port and be contaminated by dust contained in the air flow. In other words, the outside air that flows in from the intake port is blown off to the outer peripheral side by the centrifugal force of the rotating disk, so a part of it flows from the outer peripheral edge of the disk to the pickup placement side, passes through the position of the pickup and passes to the exhaust port. Come to head. Therefore, if dust is contained in the inflow air from the intake port, it adheres to the pickup. In Patent Document 2 , a dustproof filter made of non-woven fabric or the like is provided at the intake port so that dust does not enter from the intake port. However, such a dustproof filter is frequently clogged due to early clogging depending on the usage environment. If the replacement is neglected, heat will be accumulated in the casing and the life of the pickup will be reduced.

  The present invention has been made in view of the above circumstances, and its purpose is to prevent the accumulation of heat in the housing by utilizing the air flow generated by the rotation of the disk, while the dust is carried on the air flow inside the housing. It is intended to prevent the signal reading unit from being contaminated with dust even if it enters.

In order to achieve the above object, the present invention
A disk rotating unit 2 that holds the disk D and rotates it in a predetermined direction, a housing 1 having an elongated opening 16 for inserting and removing the disk D between the disk rotating unit 2 and the outside, and a disk A signal reading unit 3 for reading the recorded information of D, and a control unit 5 for controlling the drive system including the signal reading unit 3 and the disk rotating unit 2, and the control unit 5 is composed of electronic components 52 and 53. In a disk drive comprising:
The opening 16 is arranged outside the outer peripheral edge of the disk D held by the disk rotating unit 2,
The cover plate 15 located in the axial direction of the disk rotating unit 2 in the housing 1 is provided with an intake hole 15A for taking in outside air,
With reference to a straight line CC passing through the center of the opening 16 in the longitudinal direction and the axis of the disk rotating unit 2 when the housing 1 is viewed from the direction of the rotating axis of the disk D,
An area on one side of the housing 1 in which an arbitrary point on the outer periphery of the disk D rotates and moves away from the opening 16 is defined as a first area La.
A region where any point on the outer periphery of the disk D is rotated and moved in a direction approaching against the opening 16, the other side region of the housing 1 to be opposite to the first area La as the second area Ra ,
The position of the signal reading unit 3 is allocated in the first area La, the position of the heating element (electronic components 52, 53) is allocated in the second area Ra ,
The position of the intake hole 15A is in the second area Ra, and is assigned to the back side opposite to the opening 16 rather than at least one of the electronic components 52 and 53 forming the heating element. .

Also, a disk rotating unit 2 that holds the disk D and rotates it in a predetermined direction, and a housing 1 having an elongated opening 16 for inserting and removing the disk D between the disk rotating unit 2 and the outside. , A signal reading unit 3 for reading recorded information on the disk D, and a control unit 5 for controlling a drive system including the signal reading unit 3 and the disk rotating unit 2, and the control unit 5 includes electronic components 52 and 53. In a disk drive that includes a heating element,
The opening 16 is arranged outside the outer peripheral edge of the disk D held by the disk rotating unit 2,
The cover plate 15 located in the axial direction of the disk rotating unit 2 in the housing 1 and located above the heating elements (electronic parts 52 and 53) is provided with an intake hole 15A for taking in outside air,
With reference to a straight line CC passing through the center of the opening 16 in the longitudinal direction and the axis of the disk rotating unit 2 when the housing 1 is viewed from the direction of the rotating axis of the disk D,
An area on one side of the housing 1 in which an arbitrary point on the outer periphery of the disk D rotates and moves away from the opening 16 is defined as a first area La.
A region where an arbitrary point on the outer periphery of the disk D rotates and moves in a direction approaching the opening 16 and the region on the other side of the housing 1 opposite to the first area La is defined as a second area Ra. ,
The position of the signal reading unit 3 is allocated in the first area La, the position of the heating element (electronic components 52, 53) is allocated in the second area Ra,
The position of the intake hole 15A is in the second area Ra, and is assigned to a position facing at least one of the electronic components 52 and 53 forming the heating element .

Further , a plurality of intake holes 15A are provided at positions facing the disk D in the cover plate 15, and the position of the signal reading unit 3 is within the first area La and is more than the axis of the disk rotating unit 2. It is assigned to the back side opposite to the opening 16, and the position of the heating element (electronic parts 52, 53) is assigned to the position on the outer peripheral side of the disk D in the second area Ra. It is characterized by.

  According to the present invention, the opening for loading and unloading the disc is used as an outlet for the air flow generated by the rotation of the disc, and the position of the signal reading portion is set so that any point on the outer periphery of the disc is sequentially separated from the opening. An area on the outer periphery of the disk is an opening where the position of the heating element composed of electronic components for control and the intake holes for sucking outside air is assigned to one side area (first area) of the casing that rotates and moves Is assigned to the area on the other side (second area) of the casing that rotates in the direction of approaching sequentially, so that the heat released from the heating element is exhausted together with the outside air flowing in from the intake holes. Heat accumulation in the housing can be prevented, and even if the outside air flowing in from the intake hole contains dust, it can be discharged from the opening serving as the airflow outlet without being exposed to the signal reading unit.

  In particular, the position of the signal reading unit is assigned to the rear side in the first area and opposite to the opening from the axis of the disk rotating unit, so that the signal reading unit is directed from the intake hole to the opening. The signal reading unit can be prevented from being contaminated by dust by completely removing it from the air flow path.

  Furthermore, since the position of the heating element is assigned to the position on the outer periphery side of the disk in the second area, the air blown off to the outer periphery side of the disk can be exposed to the heating element in a large amount, so that the air cooling effect is improved. .

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic front view showing a disk drive device according to the present invention, and FIG. 2 is a schematic plan view showing the same device. 1 and 2, reference numeral 1 denotes a box-shaped housing that forms the exterior of the apparatus. The housing 1 has a front surface portion 11, a rear surface portion 12, both side surface portions 13A and 13B, a bottom surface portion 14, and a cover plate 15 forming an upper surface. The front surface portion 11 has a disk D (such as CD or DVD in this example). An elongated (slit-shaped) opening 16 for taking in and out the optical disk) is formed.

  In FIG. 2, reference numeral 2 denotes a disk rotating unit for rotating the disk D inserted into the housing 1 from the opening 16 in a predetermined direction (clockwise in FIG. 2). The disk rotating unit 2 is a spindle. A circular turntable 22 is fixed to the rotor shaft of the motor 21.

  Reference numeral 3 denotes a signal reading unit (in this example, an optical pickup) that reads recorded information from the disk D rotated by the disk rotating unit 2. The signal reading unit 3 is mounted on the carriage 4 and is arranged in the radial direction of the disk D. It is possible to move to. The signal reading unit 3 receives the reflected light from the disc D and a light emitting unit (laser diode) (not shown) that generates laser light to be irradiated onto the disc D through the objective lens 31 in addition to the objective lens 31. The pickup unit includes a light receiving unit (light detector) (not shown) and the like, which are integrally incorporated in the carriage 4.

  On the other hand, as apparent from FIG. 2, the cover plate 15 of the housing 1 located in the rotation axis direction of the disk D (the axial direction of the turntable 22) has an intake hole 15A having a diameter of about several millimeters within a predetermined range. A plurality of groups are formed so that outside air is drawn into the housing 1 from the intake holes 15A when the disk D is rotated by the disk rotating unit 2.

  In FIG. 2, reference numeral 5 denotes a control unit. The control unit 5 is configured by mounting control electronic components 52 and 53 serving as heating elements on a substrate 51 fixed to the bottom surface portion 14 of the housing 1. The Here, of the two electronic components 52 and 53 shown in FIG. 2, one electronic component 52 performs signal processing on the output of the signal reading unit 3 and performs focus control and tracking control of the signal reading unit ( The other electronic component 53 is an integrated circuit device (motor driver) that performs drive control of the spindle motor 21 that constitutes the disk rotating unit 2.

  In this disk drive device, the opening 16, the signal reading unit 3, the electronic component 52, the intake hole 15 </ b> A, and the electronic component 53 are used as the outlet of the air flow generated by the rotation of the disk D. It is arranged in order in the rotation direction of D.

  In particular, as shown in FIG. 2, the case 1 is viewed from the rotation axis direction of the disk D, and the case 1 is based on a straight line CC passing through the center in the longitudinal direction of the opening 16 and the axis of the disk rotation unit 2. The one area (between the straight line CC and the side surface portion 13A) is defined as a first area La, and the position of the signal reading unit 3 is allocated in the first area La. Further, a region on the other side of the housing 1 opposite to the first area La (between the straight line CC and the side surface portion 13B) is defined as a second area Ra, and a heating element is formed in the second area Ra. The positions of the electronic parts 52 and 53 and the intake holes 15A are assigned.

In the first area La, when the disk D is rotated by the disk rotating unit 2, any point on the outer periphery of the disk D is rotated and moved away from the opening 16 sequentially. In the second area Ra, the disk rotating unit 2 When the disk D is rotated, an arbitrary point on the outer periphery of the disk D is rotated and moved in a direction in which the disk D sequentially approaches the opening 16.

  Thus, when the disk D is rotated at a high speed in one direction by the disk rotating unit 2, the air around the disk D is rotated by the disk D, and an airflow around the disk D is generated in the housing 1. Since the air in the disk 1 receives a centrifugal force from the disk D and is pushed to the outer peripheral side, the air pressure decreases on both sides of the disk D, and as a result, the casing 1 passes through the intake hole 15A located on one side of the disk D. While outside air flows in, the air is exhausted to the outside of the housing 1 from the opening 16 located on the outer peripheral side of the disk D.

  FIG. 3 shows the movement of the airflow generated by the rotation of the disk D. As is apparent from this figure, when the disk D rotates (clockwise in FIG. 3), the air in the housing 1 flows over the electronic components 52 and 53, and the heat released from the electronic components 52 and 53 is generated. The air is taken out from the opening 16 together with the outside air taken in from the air intake hole 15A. Therefore, the electronic components 52 and 53 are air-cooled well, and heat is collected in the housing 1 when the disk D is rotated. Absent.

  Further, even if dust is contained in the outside air flowing in from the intake hole 15A, most of it is carried by the airflow in the housing 1 and discharged from the opening 16 located downstream of the intake hole 15A. The dust does not go around to the signal reading unit 3 located downstream of 16 and the signal reading unit 3 is not soiled.

  Here, not all of the outside air that has flowed in from the intake hole 15A immediately flows out of the opening portion 16, but a part of the outside air also goes into the first area La, so the position of the signal reading portion 3 is shown in FIGS. 3, it is preferably assigned to the back side (back side 12 side) that is in the first area La and opposite to the opening 16 with respect to the axis of the disc rotating part 2, thereby It is possible to further enhance the dustproof effect by moving the reading unit 3 away from the opening 16 serving as an airflow outlet.

  Further, as described above, the air in the housing 1 flows from the inner circumference side to the outer circumference side of the disk D, so that the positions of the electronic components 52 and 53 (heating elements) are in the second area Ra. It is preferable to be assigned to a position on the outer peripheral side of the disk D, whereby the air cooling and heat dissipation effects of the electronic components 52 and 53 can be further enhanced.

  If the position of the signal reading unit 3 is assigned to the second area Ra in the opposite direction, even if the signal reading unit 3 is located on the opposite side to the rotation direction of the disk D with respect to the electronic components 52 and 53. The signal reading unit 3 is close to the electronic components 52 and 53 due to the space in the housing 1, and the signal reading unit 3 is deteriorated by the radiant heat of the electronic components 52 and 53. 3 is assigned to the second area Ra, while the electronic parts 52 and 53 serving as heating elements are assigned to the first area La separated from the signal reading unit 3, the electronic parts 52 and 53 are rotated when the disk D is rotated. The hot air due to heat radiation from the heat is applied to the downstream signal reading unit 3, and the signal reading unit 3 is thermally deteriorated by the hot air.

  The configuration example of the disk drive device according to the present invention has been described above. However, the signal reading unit 3 or the like is not limited to read only and may have an information writing function, and is not limited to an optical pickup, and is compatible with a magnetic disk. A magnetic head may be used.

  Furthermore, the electronic components 52 and 53 as the heating elements may be assigned to positions upstream of the airflow in the housing 1 from the intake holes 15A as long as they are in the second area Ra, but enhance the heat dissipation effect. In the above, it is preferably assigned to a position directly below the intake hole 15A or downstream of the airflow generated in the housing 1 from the intake hole 15A. The control unit 5 includes a plurality of electronic components in addition to the electronic components 52 and 53 as described above, and many of them can be heating elements. In the present invention, the heating element refers to the control unit 5. Of the electronic components that make up, the heat generation amount is the maximum or the top third.

Schematic front view showing a disk drive device according to the present invention. Schematic plan view of the device Explanatory drawing showing the movement of airflow generated when the disk rotates

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 15 Cover plate 15A Intake hole 16 Opening part 2 Disk rotation part 3 Signal reading part 5 Control part 52 Electronic component (heating element)
53 Electronic components (heating elements)

Claims (5)

A disk rotating unit that holds a disk and rotates it in a predetermined direction, a casing having an elongated opening for inserting and removing the disk between the disk rotating unit and the outside, and recording information of the disk In a disk drive apparatus comprising a signal reading unit to be read and a control unit for controlling a drive system including the signal reading unit and the disk rotating unit, and the control unit includes a heating element made of an electronic component.
The opening is disposed outside the outer peripheral edge of the disk held by the disk rotating part,
The cover plate located in the axial direction of the disk rotating portion in the housing is provided with an intake hole for taking in outside air,
Based on a straight line passing through the center of the opening in the longitudinal direction and the axis of the disk rotating portion when the housing is viewed from the rotating shaft direction of the disk,
An area on one side of the housing that rotates in a direction in which an arbitrary point on the outer periphery of the disk moves away from the opening is a first area,
A region where any point on the outer periphery of said disk rotates moved toward against the said opening, the other side region of the housing to be opposite to the first area as the second area,
The position of the signal reading unit is allocated in the first area, the position of the heating element is allocated in the second area ,
The disk drive characterized in that the position of the air intake hole is in the second area and is assigned to the back side opposite to the opening rather than at least one of the electronic components constituting the heating element. apparatus. A disk rotating unit that holds a disk and rotates it in a predetermined direction, a casing having an elongated opening for inserting and removing the disk between the disk rotating unit and the outside, and recording information of the disk In a disk drive apparatus comprising a signal reading unit to be read and a control unit for controlling a drive system including the signal reading unit and the disk rotating unit, and the control unit includes a heating element made of an electronic component.
The opening is disposed outside the outer peripheral edge of the disk held by the disk rotating part,
The cover plate located in the axial direction of the disk rotating portion in the housing and located above the heating element is provided with an intake hole for taking in outside air,
Based on a straight line passing through the center of the opening in the longitudinal direction and the axis of the disk rotating portion when the housing is viewed from the rotating shaft direction of the disk,
An area on one side of the housing that rotates in a direction in which an arbitrary point on the outer periphery of the disk moves away from the opening is a first area,
A region where any point on the outer periphery of said disk rotates moved toward against the said opening, the other side region of the housing to be opposite to the first area as the second area,
The position of the signal reading unit is allocated in the first area, the position of the heating element is allocated in the second area ,
The disk drive device according to claim 1, wherein the position of the intake hole is in the second area, and is assigned to a position facing at least one of the electronic components forming the heating element . 3. The disk drive device according to claim 1, wherein a plurality of the air intake holes are provided at positions facing the disk in the cover plate . 4. The position of the signal reading unit is assigned to a back side that is in the first area and opposite to the opening from the axis of the disc rotating unit. The disk drive device according to any one of the above. 5. The disk drive device according to claim 1, wherein the position of the heating element is assigned to a position on the outer periphery side of the disk in the second area.

Images