JP4724403B2 - Disc player - Google Patents

Description

  The present invention relates to a disc reproducing apparatus in which devices are arranged in a housing.

  In a disk reproducing apparatus for reproducing an optical disk or the like and for recording / reproducing on an optical disk or the like, a component device provided therein serves as a heat source, and the heat generated by the component device greatly affects the performance and durability of the disk reproducing device. . For this reason, in the disk reproducing apparatus, measures are taken to improve the heat dissipation performance. For example, Patent Document 1 discloses a disk reproducing apparatus in which outside air is introduced into an air passage chamber by a cooling fan, and a circuit board on which electronic components are attached is disposed so as to face the air passage chamber.

Japanese Patent Laid-Open No. 2003-100069

  However, when the outside air is introduced into the disk playback device by the cooling fan as disclosed in Patent Document 1, dust in the air is taken into the disk playback device together with the outside air, which may cause internal contamination. . In particular, since a pickup unit that reads information from a disk and a recording unit that records information on a disk are sensitive to dirt, simply introducing outside air may reduce the durability thereof. In order to avoid the problem of internal contamination, there is a method in which the space in which the pickup unit or the like is disposed is a closed space. However, in this method, heat radiation is insufficient.

  Therefore, the present invention solves the above-described problem as an example, and provides a disk reproducing apparatus capable of improving the cooling performance of the equipment in the apparatus without actively introducing outside air into the apparatus. With the goal.

According to the first aspect of the present invention, there is provided a disk placement portion having a placement surface for placing a disk, a disk drive means for rotating the disk, and an air flow based on a differential pressure generated as the disk rotates. An air suction part for allowing air below the arrangement surface to flow above the arrangement surface and an outer peripheral part and an inner peripheral part of the disk communicate with each other. A tubular passage formed in a tubular shape by a bottom portion, and a differential pressure generating means for generating a differential pressure using the flow of the air; provided in the disk placement portion; And a second air suction portion that flows into the lower side of the arrangement surface.
According to a second aspect of the present invention, there is provided a disk placement portion having a placement surface for placing a disk, a disk drive means for rotating the disk, and an air flow based on a differential pressure generated as the disk rotates. On the other hand, an air suction portion for allowing air below the placement surface to flow above the placement surface, and the disc for guiding the air sucked from the air suction portion to the central portion of the disc And an air introduction passage formed in a tubular shape by a bottom portion provided on the side corresponding to the differential pressure generating means for generating a differential pressure using the air flow, and provided in the disk arrangement portion, the arrangement surface And a second air suction portion for allowing air on the upper side to flow into the lower side with respect to the arrangement surface.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the best mode for carrying out the invention. In addition, constituent elements in the embodiments described below include those that can be easily assumed by those skilled in the art or those that are substantially the same. The present invention can be applied to all types of disc reproducing apparatuses that record information on or record information on optical discs, magnetic discs, magneto-optical discs and other discs, and the type of disc is not limited.

(Embodiment 1)
The disk reproducing apparatus according to Embodiment 1 causes the air in the housing to be sucked into the central part of the disk by the rotation of the disk, and the sucked air is discharged to the outside in the radial direction of the disk by the rotation of the disk. It is characterized in that a differential pressure generating means having a function is provided.

  FIG. 1 is an overall view showing an outline of the disc reproducing apparatus according to the first embodiment. The disc playback apparatus 100 plays back information recorded on an optical disc (hereinafter referred to as a disc) 14 such as a CD (Compact Disc) or DVD (Digital Versatile Disc). The disc reproducing apparatus 100 only needs to be able to reproduce at least information recorded on the disc 14 and may further have a function of recording information on the disc 14.

  The disc playback apparatus 100 includes a case body 4 in which the apparatus main body 101 is disposed. The outer shape of the case body 4 is a substantially hexahedron, and a panel 15 is provided on the disk 14 removal side. The apparatus main body 101 includes a drive unit for the disk 14, an information reading unit for reading information recorded on the disk 14, and the like, and is a core part of the disk reproducing apparatus 100. The apparatus main body 101 supports a frame body 1 to which devices such as a disk driving unit, an information reading unit, and a circuit board are attached, and a clamper 11 that is attached to the frame 1 and is a part of the disk holding unit, and is rotating And the lid 2 for protecting the disk 14. The frame 1 is made of, for example, a resin material. The lid 2 is preferably made of a metal material that is a good conductor of heat in consideration of heat transfer, but is not limited thereto, and may be made of a resin material.

  The electric motor 5 that is a disk driving means and the pickup 6 that is an information reading means are attached to a base 9 made of, for example, a metal plate. The electric motor 5 is, for example, a spindle motor or the like, and rotates the disk 14 held by the disk via the disk holding means. The electric motor 5 releases heat during operation and becomes a heat source. In this embodiment, the disk holding means includes a drive side disk holding means and a clamper 11 which is a lid side disk holding means. The clamper 11 is substantially circular, and in a standby state in which information is not read from the disk 14, the flange protruding from the outer periphery of the clamper 11 engages with the inner periphery of the clamper support hole drilled in the lid 2. Thus, the clamper 11 is supported by the lid 2 in the standby state.

  The drive side disk holding means includes a disk table 13 and a substantially cylindrical disk holding boss 12 that fits into a shaft hole drilled in the center of the disk 14. A magnet is incorporated in the disk table 13, and when the clamper 11 clamps the disk 14 by the magnet of the disk table 13 and the attractive force of the metal part of the clamper 11, the disk 14 is held by the disk holding means.

  The pickup 6 includes a light source such as a laser diode, a lens that converges light from the light source and irradiates the disk 14, and an optical sensor that detects light reflected from the disk 14. The pickup 6 linearly moves in parallel with the radial direction of the disk 14 from the center to the outside while the disk 14 is rotating. In the process, the pickup 6 reads information recorded on the information recording surface 14 i of the disk 14. A laser diode or the like used for the pickup 6 is a semiconductor that generates a large amount of heat and serves as a heat source. Further, the durability of the laser diode depends on its temperature, and if it is used at a specified temperature or higher, the durability is lowered. For this reason, the light source such as a laser diode provided in the pickup 6 needs to be sufficiently cooled.

  The pedestal 9 is attached to an attachment pedestal 16 formed integrally with the frame 1 via a vibration isolating member 17 made of an elastic material such as rubber. As a result, the external vibration transmitted from the frame 1 to the pickup 6 via the pedestal 16 and the pedestal 9 is attenuated, so that the information recorded on the disk 14 can be read more reliably by the pickup 6.

  A circuit board 7 is attached to the frame 1. The circuit board 7 is an outer portion of the frame body 1 and is disposed between the pedestal 9 and the case body 4. An electric / electronic component 8 such as a CPU (Central Processing Unit) and a capacitor is attached to the circuit board 7, and the operation of the electric motor 5 and the pickup 6 is controlled and a disk read by the pickup 6 is read. 14 information is processed. Here, the electrical / electronic component 8 attached to the circuit board 7 emits heat during operation and becomes a heat source.

  The apparatus main body 101 is provided with a disk tray 3 which is a disk placement unit for placing the disks 14. The disc tray 3 is driven by a tray driving motor 10 which is a tray driving means, and is sent out to the panel 15 side of the disc reproducing apparatus 100. At this position, the disk 14 is placed on the placement surface 3p provided on the disk tray 3, and the disk 14 is removed from the disk tray 3. When the disk 14 is placed on the disk tray 3, the disk drive 3 pulls the disk tray 3 into the apparatus main body 101. Then, after being held by the disk holding means, it is rotated by the electric motor 5 and information is read by the pickup 6. In the present embodiment, a tray loading method using a transport tray (disk tray 3) will be described. However, the present invention is not limited to this as long as it does not depart from the gist of the present invention. That is, the present invention is not limited to the example using the transport tray, and can be applied to, for example, an open top type disk reproducing device.

  Here, the upper side and the lower side of the arrangement surface will be described. “Upper side of the placement surface” refers to the side on which the disk 14 is placed on the placement surface 3p with reference to the placement surface 3p (see FIG. 1). Further, “below the placement surface” refers to the side opposite to the side on which the disk 14 is placed on the placement surface 3p with respect to the placement surface 3p. For example, in FIG. 1, “above the placement surface” is the lid 2 side, and “below the placement surface” is the side on which the pickup 6 and the circuit board 7 are placed. Here, “above the placement surface” and “below the placement surface” are defined with reference to the placement surface on which the disc is placed, and are not affected by the installation direction of the disc playback apparatus 100. .

Apparatus main body 101, depending on the disc 14 and the disc tray 3, a space (first space) 18 ₁ on the side of the pickup 6 and the circuit board 7 is disposed, the space (second space) of the lid 2 side 18 ₂ Divided into In the first space 18 ₁ , heat sources such as the electric / electronic component 8 and the electric motor 5 attached to the pickup 6 and the circuit board 7 are arranged, so that the temperature of the air in the first space 18 ₁ rises. However, since the area where the air in the first space 18 ₁ contacts the inner surface of the apparatus main body 101 for heat dissipation to the outside of the apparatus main body 101 is small with respect to the amount of heat generated in the first space 18 ₁ , the heat dissipation is insufficient. Become. On the other hand, the ₂ second space 18 because the heat source does not exist, the temperature rise of the second space 18 the _second air is little. Moreover, since the area where the air in the second space 18 ₂ contacts the inner surface of the apparatus main body 101 is large, the cooling capacity is potentially large.

The present inventors pay attention to this point and, as a result of intensive research, lead the heated air in the first space 18 ₁ to the second space 18 _{2 having} a large cooling capacity and cool it here. 18 ₁ that efficiently first space 18 ₁ guides the second space 18 _second air low temperature into the first space 18 _1, compared to cooling, which resulted in the completion of the cooling structure of the present invention. This is based on the following principle. When the disk 14 rotates, the air in contact with the surface of the disk 14 is dragged by the frictional force with the surface of the disk 14 and rotates in the same direction as the disk 14. Then, the air in contact with the surface of the disk 14 is released to the outside in the radial direction of the disk 14 by the centrifugal force generated by the rotation of the disk 14. At this time, since the pressure is reduced at the center of the disk 14, air is sucked toward the center of the disk 14, and a flow is generated that is discharged radially outward. This flow is actively used to cool the equipment in the first space 18 ₁ . Next, this cooling structure will be described in detail. In the following description, please refer to FIG. 1 as appropriate.

  FIG. 2 is a plan view showing an apparatus main body of the disk reproducing apparatus according to the first embodiment. A protrusion 20 that is a differential pressure generating unit that sucks air into the center of the disk 14 is provided on the surface of the lid 2 that is provided in the apparatus main body 101 of the disk reproducing apparatus 100 according to Embodiment 1 that faces the disk 14. It is done. The protrusion 20 is formed linearly from the center of the disk 14 toward the outside in the radial direction. For example, when the lid body 2 is manufactured, the protruding portion 20 can be formed integrally with the lid body 2 by sheet metal processing. Alternatively, the protrusion 20 may be prepared as a member separate from the lid 2 and attached to the lid 2. Thus, by providing the differential pressure generating means, the air in the apparatus main body 101 of the disk reproducing apparatus 100 can be actively collected and discharged from the outer peripheral portion of the disk 14. As a result, air can be circulated in the apparatus main body 101 to efficiently cool the devices in the apparatus.

In the first embodiment, an air introduction passage 30 is further provided in the lid 2 as a differential pressure forming unit. The air introduction passage 30 is formed from the center portion of the disk 14 to the air suction portion 60 provided in the frame 1. The air introduction passage 30 has a shape in which the disk 14 side is opened. Then, the air induction passage 30 from the air intake unit 60 provided in the frame 1, direct air _first air first space 18 to the center of the disk 14. Note that the shape of the air introduction passage 30 is not limited to the shape shown in FIG. 2, and can be changed as appropriate in consideration of air flow, differential pressure generation efficiency, and the like. If at least the protrusion 20 is provided as the differential pressure generating means, air can be guided from the air suction portion 60 to the center portion of the disk 14, but by providing the air introduction passage 30, it is more efficient. Air can be directed to the center of the disk 14. Moreover, the air suction effect can be improved by sealing the opening of the clamper portion.

The air sucked from the air suction part 60 is guided to the center part of the disk 14 through the air introduction passage 30 and then discharged to the outside in the radial direction of the disk 14. Then, after being guided to the air outlet passage 50, the air flows into the first space 18 ₁ through the air discharge portion 40 </ b> A (corresponding to the second air suction portion). The air suction portion 60 and the air discharge portion 40A are disposed on the opposite side of the disc main body 101 from the disc ejection side EX with respect to the rotation axis Z of the disc 14. Further, the air inlet 60 and the air inlet of the air discharge part 40A are separated from each other by about α at the central angle when the rotation axis Z of the disk 14 is the center.

The larger the central angle, air can be fed to the air discharge portion 40A at a higher pressure, as a result, can be more efficiently cooled equipment such as pick-up 6 and the electric motor 5 is arranged in the first space 18 _1. The arrangement of the air suction unit 60 and the air discharge portion 40A of the apparatus main body 101 according to the first embodiment, it is possible to relatively large the central angle, in that the cooling equipment is arranged in the first space 18 ₁ preferable.

The protrusion 20 is provided in the vicinity of the air introduction passage edge 30t on the side opposite to the rotation direction (R direction) of the disk 14. Here, when the radius of the disk 14 is r ₁ , an area smaller than r _1/2 is defined as the center part of the disk 14, and an area greater than r _1/2 is defined as the outer peripheral part of the disk 14. The lid 2 is provided with an air outlet passage 50 that collects air in the second space 18 ₂ discharged radially outward by the rotation of the disk 14. The disc tray 3 is provided with an air outlet 40 through which the air in the second space 18 ₂ collected in the air outlet passage 50 is fed into the first space 18 ₁ .

FIG. 3 is a schematic diagram showing the air flow in the main body of the disk reproducing apparatus according to the first embodiment. In FIG. 3, an arrow indicated by a solid line indicates an air flow in the second space 18 ₂ , and an arrow indicated by a broken line indicates an air flow in the first space. Refer to FIG. 1 for the first and second spaces 18 ₁ , 18 ₂ . When the disk 14 is rotated in the direction of arrow R shown in FIG. 3 by the electric motor 5, the air in the second space 18 ₂ that is in contact with the surface of the disk 14 is radiated in the radial direction of the disk 14 by the centrifugal force generated by the rotation of the disk 14. Released to the outside. At this time, since the pressure is reduced at the center of the disk 14, the air is heated from the air suction portion 60 provided in the frame 1 by the heat generated in the first space 18 ₁ , that is, the pickup 6, the electric motor 5, and the like. Is sucked toward the center of the disk 14 and then discharged to the outside in the radial direction of the disk 14. Here, if the pressure at the center of the disk 14 is Pi and the pressure at the outer periphery is Po, then Pi <Po.

The air discharged radially outward by the rotation of the disk 14 comes into contact with the lid 2 in the process, and dissipates heat to the lid 2 to be cooled. The cooled air is collected in the air lead-out passage 50 formed in the lid body 2 and sent into the first space 18 ₁ from the air discharge port 40 provided in the disc tray 3. The flow path of the air sent to the first space 18 _1, the pickup 6 and the electric motor 5 other heat source disposed in the first space 18 ₁ is located. As a result, the device that is the heat source disposed in the first space 18 ₁ is cooled by the air cooled in the second space 18 ₂ .

The air after cooling the device as the heat source is sucked out again from the air suction portion 60 to the second space 18 ₂ and flows as described above. As described above, in the cooling structure of the disk reproducing apparatus according to the first embodiment, the air is circulated between the spaces in the apparatus main body divided by the disk and the disk tray by using the rotation of the disk, and is a device that is a heat source. The inside of the space where is placed is cooled. That is, passing a first space 18 ₁ of air heated to heat radiation area is large the second space 18 _2, the air cooled in the second space 18 ₂ flows into the first space 18 _1, circulation of air in both spaces By doing so, it is possible to efficiently cool the device that is the heat source arranged in the first space. Next, each component in the cooling structure of the disk reproducing apparatus according to the first embodiment will be described.

  4 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a view seen from the direction of the arrow X in FIG. As indicated by an arrow Air in FIG. 4, the air in contact with the surface of the disk 14 is dragged by the frictional force with the surface of the disk 14 and rotates in the same direction (R direction) as the disk 14. As shown in FIG. 4, since the air introduction passage 30 has a shape in which the disk 14 side is opened, the air may enter from the opening of the air introduction passage 30. In the first embodiment, the protrusion 20 is provided in the vicinity of the air introduction passage edge 30t on the side opposite to the rotation direction of the disk 14, thereby suppressing the air from flowing into the air introduction passage 30.

Thus, interference between the air that is dragged by the frictional force with the surface of the disk 14 and the air that flows to the center of the disk 14 through the air introduction passage 30 is suppressed. As a result, a sufficient differential pressure between the center portion and the outer peripheral portion of the disk 14 can be ensured, so that the air in the first space 18 ₁ is sucked out from the air suction portion 60 as shown in FIG. It can be led to the center of the disk 14 through the introduction passage 30. The air guided to the center of the disk 14 is discharged to the outside in the radial direction of the disk 14 by centrifugal force generated by the rotation of the disk 14.

  FIG. 6 is an explanatory diagram showing the formation range of the protrusions. In the first embodiment, the protrusion 20 is a differential pressure generating means that generates a differential pressure between the central portion and the outer peripheral portion by the rotation of the disc 14 and sucks air into the central portion of the disc 14. In order to effectively generate the differential pressure by suppressing the air that is dragged by the frictional force with the surface of the disk 14 from flowing into the air introduction passage 30, the length of the protrusion 20 is preferably as long as possible. .

As shown in FIG. 6, the length of the protrusion 20 is preferably at least (l ₁ ) up to the outer periphery of the disk 14. More preferably, the length l ₂ is substantially equal to the radius of the disk tray 14 where the disk is placed. This is to suppress the air flowing around the end of the protrusion 20 on the outer peripheral side of the disk 14 and flowing into the air introduction passage 30. Furthermore, it is more preferable that the length of the protruding portion 20 is (l ₃ ) up to the vicinity of the air suction portion 60 provided in the frame body 1. The protrusion 20 is preferably provided from the vicinity of the outer periphery of the clamper 11. Further, the protrusions 20 are not necessarily provided continuously, and a plurality of protrusions may be provided from the center part of the disk 14 toward the outer peripheral part.

  FIG. 7A and FIG. 7B are cross-sectional views showing other examples of the protrusions. The cross-sectional shape of the protrusion 20 is rectangular or square (see FIG. 4), but the cross-sectional shape may be a substantially semicircular shape like the protrusion 21 shown in FIG. 7B, the cross-sectional shape may be an arc and a straight line, or a combination of a plurality of arcs with different curvatures.

8 is a cross-sectional view taken along the line BB in FIG. The relationship between the air suction portion 60 and the air introduction passage 30 and the air flow will be described with reference to FIG. The air suction portion 60 is provided on the side portion of the frame body ₁ , and the air inlet 60 i opens into the first space 18 ₁ and the air outlet 60 o opens into the second space 18 ₂ . Thereby, the first space 18 ₁ and the second space 18 ₂ communicate with each other. The air introduction passage 30 is attached to the frame body 1 so as to cover the air outlet 60 o of the air suction portion 60. Note that the air suction portion 60 may be formed in the disc tray 14. Further, the air suction part 60 may be formed in both the frame 1 and the disk tray 14. Thus, the air suction part 60 may be formed in at least one of the frame 1 or the disk tray 14.

When the disk 14 rotates, the pressure Pi at the center of the disk 14 becomes smaller than the pressure Po at the outer periphery, so the air in the first space 18 ₁ is sucked into the air introduction passage 30 and the second space 18 ₂ . Can lead to. That is, the air below the arrangement surface 3p can be made to flow above the arrangement surface 3p. Here, in the first space 18 ₁ , heat sources such as the electric / electronic components 8 and the electric motor 5 attached to the circuit board 7 are stored, and the temperature of the air in the first space 18 ₁ becomes high. Yes. The heated air is guided to the second space 18 ₂ and brought into contact with the lid 2, whereby the heat of the air guided to the second space 18 ₂ is radiated to the outside of the apparatus main body 101 through the lid 2.

9 is a cross-sectional view taken along the line CC of FIG. FIG. 10 is a cross-sectional view showing another example of the lid according to the first embodiment. First, the shape of the lid body 2 will be described with reference to FIG. As shown in FIG. 9, the lid 2 is formed in a wall shape at the outer periphery of the disc tray 3 on the side in the pulling direction. The air in the first space 18 ₁ that is sucked into the center of the disk 14 by the rotation of the disk 14 and then discharged to the outside in the radial direction of the disk 14 strikes the wall-shaped outer periphery 2 o and is guided in the circumferential direction of the disk 14. . As a result, the air in the first space 18 ₁ is efficiently collected at the air outlet 40.

  Further, the cross-sectional shape of the lid 2 is configured such that the distance between the disc 14 and the lid 2 is smaller in the outer circumferential portion at the center portion and the outer circumferential portion of the disk 14. In the first embodiment, the distance between the disk 14 and the lid 2 is reduced toward the outer side in the radial direction of the disk 14. That is, at the outer periphery of the disk 14, the flow passage cross-sectional area of the air discharged to the outside in the radial direction of the disk 14 by the rotation of the disk 14 becomes small. As a result, the air discharged to the outer side in the radial direction of the optical disk 14 has a high speed at the outer peripheral portion of the disk 14 and is therefore efficiently collected at the air discharge port 40.

  In the lid body 2 shown in FIG. 9, the distance between the disk 14 and the lid body 2 changes linearly outward in the radial direction of the disk 14, but like the lid body 2a shown in FIG. Moreover, it may change in a curve. Further, the distance between the disk 14 and the lid 2 may be decreased stepwise toward the outer side in the radial direction of the disk 14.

11 is a cross-sectional view taken along the line DD of FIG. 12 is a cross-sectional view taken along line EE in FIG. The disc tray 3 is formed with a plurality of air discharge ports 40 for sending the air in the second space 18 ₂ into the first space 18 ₁ . Air discharge port 40, for feeding air to efficiently first space 18 _1, (4 in this example) a plurality valley bottom of the inlet portion 45 formed in trough shape is provided. In the first embodiment, the plurality of air discharge ports 40 provided constitute the air discharge unit 40A. In addition, the shape of the introduction part 45 is not limited to what is shown in FIG. 11, FIG. 12, and the introduction part 45 does not necessarily need to be provided if the air discharge port 40 is provided.

The lid body 2 is provided with an air outlet passage 50. As shown in FIGS. 11 and 12, when the lid body 2 is attached to the frame body 1, the air outlet passage 50 covers the air discharge port 40. Become. Then, the air discharged to the outside in the radial direction of the disk 14 by the rotation of the disk 14 strikes the wall-shaped outer peripheral portion 2o of the lid 2 and is then guided to the air outlet passage 50 provided in the lid 2. This air flows from the air discharge port 40 into the first space 18 ₁ .

  As described above, in the first embodiment, the air positively collected by the differential pressure generating means at the center of the disk can be discharged from the outer periphery of the disk. Thereby, it is possible to efficiently cool the equipment in the apparatus main body without actively circulating air in the apparatus main body and introducing outside air into the apparatus main body.

  In the first embodiment, air is circulated in the first space and the second space partitioned by the disc and the tray using the differential pressure generated by the differential pressure generating means. That is, air below the arrangement surface on which the disk is arranged is caused to flow above the arrangement surface. Thereby, the hot air of the 1st space in which a heat source is stored, and the cold air of the 2nd space with a large heat dissipation area can be circulated effectively. Further, since the air in the second space has a large contact surface with the lid, the heat of the air circulated from the first space is efficiently released from the inside of the device to the outside and cooled. As a result, the equipment in the apparatus can be efficiently cooled without introducing outside air into the apparatus.

(Modification)
The disc reproducing apparatus according to the modification of the first embodiment has substantially the same configuration as the disc reproducing apparatus according to the first embodiment, but an air discharge unit that discharges air to the first space, and the air in the first space The air suction part that sucks the air is different from the air suction part that is positioned substantially diagonally in the rectangular apparatus main body in plan view. Since other configurations are the same as those of the disc reproducing apparatus according to the first embodiment, description thereof is omitted. The “plan view” means a state in which the apparatus main body is viewed from the direction of the rotation axis of the disk. In the following description, please refer to FIG. 1 as appropriate.

FIG. 13 is a plan view showing the main body of the disk reproducing apparatus according to the modification of the first embodiment. The apparatus main body 101a of the disk reproducing apparatus according to the modification of the first embodiment has a rectangular shape in plan view as shown in FIG. An air suction portion 61 that sucks the air in the first space 18 ₁ into the second space 18 ₂ is provided on the side surface of the frame 1 included in the apparatus main body 101a on the optical disc ejection side (EX side in FIG. 13). Air introduction passage 30a is provided so as to cover the air intake section 61, it guides the first space 18 ₁ of air by rotation of the disk 14 to the center of the disk 14.

The disc tray 3 is formed with a plurality of air discharge ports 40 for sending the air in the second space 18 ₂ into the first space 18 ₁ . In this modification, a plurality of air discharge ports 40 provided constitute an air discharge portion 40A. When the apparatus main body 101a is viewed in a plan view with the disc tray 3 pulled into the apparatus main body 101a, the air discharge part 40A and the air suction part 61 are positioned on a substantially diagonal line CL of the apparatus main body 101a. Provided.

With such a configuration, the air sent from the air discharge part 40A to the first space 18 ₁ flows in the first space 18 ₁ through the diagonal line CL of the apparatus main body 101a, and from the air suction part 61 to the second space 18. Sucked into ₂ . For this reason, the air flowing in from the second space 18 ₂ flows over a wider range in the first space 18 ₁ compared to the apparatus main body 101 according to the first embodiment. As a result, it is possible to cool the device that is the heat source arranged in the first space 18 ₁ more efficiently.

  As described above, in the modification of the first embodiment, the air discharge portion that discharges air to the first space and the air suction portion that sucks air in the first space are substantially diagonal in the rectangular apparatus body in plan view. To be located. Thereby, since the air cooled in 2nd space flows over the wide range of 1st space, the apparatus in an apparatus, especially the apparatus in 1st space can be cooled more efficiently.

(Embodiment 2)
The disc reproducing apparatus according to the second embodiment has substantially the same configuration as the disc reproducing apparatus according to the first embodiment, but a tubular passage that communicates the center portion and the outer peripheral portion of the disc is used as the differential pressure generating means. This is different in that the air sucked from the first space is guided to the center of the disk. Since other configurations are the same as those of the disc reproducing apparatus according to the first embodiment, description thereof is omitted. In the following description, please refer to FIG. 1 as appropriate.

  FIG. 14 is a plan view showing the main body of the disk reproducing apparatus according to the second embodiment. 15 is a cross-sectional view taken along line AA in FIG. 16 is a cross-sectional view taken along line BB in FIG. An apparatus main body 101b of a disk reproducing apparatus according to Embodiment 2 is provided with an air introduction passage 31 in the lid 2.

As shown in FIGS. 15 and 16, the air introduction passage 31 according to the second embodiment forms a tubular passage by a bottom portion 31 </ b> B provided on the side facing the disk 14. The air inlet 31 i of the air introduction passage 31 covers the air outlet 60 o of the air suction portion 60. As a result, the air sucked from the first space 18 ₁ is guided into the air introduction passage 31 through the air inlet 31 i of the air introduction passage 31 and opened to the center of the disk 14. It is sucked from 31o to the center of the disk 14. This air is discharged to the outside in the radial direction by the rotation of the disk 14. Thus, the air below the arrangement surface 3p flows into the upper side of the arrangement surface 3p. Since the subsequent air flow is as described in the first embodiment and its modifications, the description thereof is omitted.

The air introduction passage 31 according to the second embodiment is formed in a tubular shape by a bottom portion 31B provided on the side facing the disk 14. For this reason, the amount of air that enters the air introduction passage 31 and rotates in the same direction as the disk 14 can be greatly reduced by the bottom portion 31B. As a result, even if the protrusion 20 (see FIG. 2 and the like) required in the first embodiment and the modification thereof is not provided, a sufficient differential pressure between the central portion and the outer peripheral portion of the disk 14 can be secured to The air in the first space 18 ₁ can be efficiently sucked from the portion 60. Thus, the air introduction passage 31 according to Embodiment 2 functions as a differential pressure generating unit.

  FIG. 17A and FIG. 17B are explanatory views showing a configuration example of the air introduction passage according to the second embodiment. The air introduction passage according to the second embodiment can be configured by attaching a bottom portion 31aB to a top portion 31aT formed integrally with the lid 2 as in an air introduction passage 31a shown in FIG. 17A, for example. it can. Moreover, like the air introduction channel | path 31b shown in FIG.17 (b), while forming the cover body 2 integrally with the top part 31bT of the air introduction channel | path 31b, it can comprise by attaching the top part 31bT.

  As described above, in the second embodiment, a tubular passage that communicates the center portion and the outer peripheral portion of the disk is used as the differential pressure generating means. As a result, it is possible to suppress the air flowing while being dragged to the surface of the disk from flowing into the tubular passage that is the differential pressure generating means, so that the air can flow more efficiently to the low pressure side. As a result, the circulation of air in the apparatus can be further promoted, and the equipment in the apparatus can be cooled more efficiently.

(Embodiment 3)
The disk reproducing apparatus according to Embodiment 3 is provided with differential pressure generating means on the first space side, and air is sucked into the center of the disk from the first space side, and is sucked from between the disk placement part and the disk. The difference is that air is discharged. Since other configurations are the same as those of the disc reproducing apparatus according to the first embodiment, description thereof is omitted. In the following description, please refer to FIG. 1 as appropriate.

FIG. 18 is a plan view showing an apparatus main body of the disk reproducing apparatus according to the third embodiment. 19 is a cross-sectional view taken along line AA in FIG. 20 is a diagram viewed from the X direction of FIG. Incidentally, the solid line arrows in FIG. 18 shows the air flowing between the disk tray 3 and the disk 14, dotted arrows show the air flowing through the first space 18 _1.

The apparatus main body 101c of the disk reproducing apparatus according to the third embodiment includes a protrusion 23 as a differential pressure generating unit that sucks air into the center of the disk 14 by the rotation of the disk 14. The disc tray 3 is provided with an air suction part 62 (corresponding to a third air suction part) for sucking air in the first space 18 ₁ . The air suction portion 62 is provided so as to be positioned at the center of the disposed disk 14 when the disk 14 is disposed on the disk tray 3. In addition, the disk tray 3 is provided with an air discharge portion 41A for sending air discharged to the outside in the radial direction of the disk 14 to the second space 18 ₂ by the rotation of the disk 14.

  As shown in FIGS. 18 and 20, the protrusion 23 is provided linearly from the center of the disk 14 toward the outer side in the radial direction and near the outer periphery of the disk 14. In this example, the cross-sectional shape of the protrusion 23 is rectangular as in the case of the protrusion 20 (see FIG. 4) described in the first embodiment, but is not limited thereto.

  As shown in FIGS. 19 and 20, during the rotation of the disk 14, the protrusion 23 is located in the vicinity of the opening edge 3 ot of the tray opening 3 o on the rotation direction (R direction) side of the disk 14, It approaches the disk 14 to a certain distance. This operation will be described.

  FIG. 21A and FIG. 21B are explanatory views showing the operation of the protrusion according to the third embodiment. Each figure shows the state seen from the direction of the arrow EX in FIG. FIG. 21A shows a state in which the disc tray 3 on which the disc 14 is arranged is drawn into the apparatus main body 101c. In the third embodiment, the protrusion 23 is attached to the electric motor 5. The distance between the end of the protrusion 23 on the disk 14 side and the surface of the disk table 13 that contacts the disk 14 is t.

  When the disk 14 is rotated and information recorded thereon is read, the disk 14 is held between the disk table 13 and the clamper 11. Therefore, the electric motor 5 is moved in the direction of the arrow U in FIG. 21A, that is, in the direction of the disk 14, and the disk holding boss 12 of the electric motor 5 is moved to the center of the disk 14 as shown in FIG. It is made to mate with the shaft hole drilled in. As a result, the distance between the end of the protrusion 23 on the disk 14 side and the disk 14 is t.

In this state, as shown in FIGS. 21 (b), 19, and 20, the protrusion 23 protrudes from the arrangement surface of the disk tray 3, and the air dragged to the surface of the disk 14 is blocked by the protrusion 23. As a result, on the optical disc rotation direction side of the protrusion 23 (that is, the downstream side of the flow dragged by the disc 14), a pressure difference between the pressure at the center of the disc and the outer peripheral portion tends to occur. Note that the pressure is lower in the center of the disk than in the outer periphery. Thus, as shown in FIG. 19, the air suction unit 62 provided on the disc tray 3, while the disk tray 3 and the disc 14, it is possible to suck the air in the first space 18 _1. Thereby, the air below the arrangement surface 3p flows into the upper side of the arrangement surface 3p.

22 is a cross-sectional view taken along the line BB in FIG. The air in the first space 18 ₁ sucked from the air suction portion 62 provided in the disk tray 3 is discharged from the space between the disk 14 and the disk tray 3 to the outside in the radial direction of the disk 14 by the rotation of the disk 14. . Then, as shown in FIG. 22, the air is discharged from the air discharge portion 41 </ b> A provided in the disc tray 3 to the second space 18 ₂ . The heated air in the first space 18 ₁ sent to the second space 18 ₂ comes into contact with the lid body 2 and dissipates heat. As shown in FIG. 18, the air cooled by radiating heat to the lid body 2 flows into the first space 18 ₁ from the tray opening 3o of the disk tray 3, and cools the heat sources such as the pickup 6 and the electric motor 5. .

  As described above, in the third embodiment, the air in the second space positively collected at the center of the disk by the differential pressure generating means provided on the second space side is discharged from the outer periphery of the disk. Thereby, air can be actively circulated in the apparatus main body, and the apparatus in the apparatus can be efficiently cooled. Note that the cooling structure described in Embodiment 3 may be used alone, or may be used in combination with the cooling structure described in Embodiment 1 or Embodiment 2. When used in combination, a more positive air flow can be generated in the disk reproducing apparatus, so that the equipment in the disk reproducing apparatus can be cooled more efficiently.

  Further, according to the third embodiment, air is circulated in the first space and the second space partitioned by the disc and the tray using the differential pressure generated by the differential pressure generating means. That is, air below the arrangement surface on which the disk is arranged can be allowed to flow above the arrangement surface. Thereby, the hot air of the 1st space in which a heat source is stored, and the cold air of the 2nd space with a large heat dissipation area can be circulated effectively. Further, since the air in the second space has a large contact surface with the lid, the heat of the air circulated from the first space is efficiently released from the inside of the device to the outside and cooled. As a result, it is possible to efficiently cool the equipment in the apparatus main body, particularly the equipment in the first space in which the heat generation source is housed.

1 is an overall view showing an outline of a disc playback apparatus according to Embodiment 1. FIG. 1 is a plan view showing a device main body of a disk reproducing device according to Embodiment 1. FIG. FIG. 3 is a schematic diagram showing an air flow in the main body of the disk reproducing device according to the first embodiment. It is AA sectional drawing of FIG. It is the figure seen from the arrow X direction of FIG. It is explanatory drawing which shows the formation range of a projection part. It is sectional drawing which shows the other example of a projection part. It is sectional drawing which shows the other example of a projection part. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. 6 is a cross-sectional view showing another example of a lid according to Embodiment 1. FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. FIG. 6 is a plan view showing a device main body of a disk reproducing device according to a modification of the first embodiment. FIG. 6 is a plan view showing a device main body of a disk reproducing device according to a second embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. FIG. 6 is an explanatory diagram showing a configuration example of an air introduction passage according to Embodiment 2. FIG. 6 is an explanatory diagram showing a configuration example of an air introduction passage according to Embodiment 2. FIG. 6 is a plan view showing a device main body of a disk reproducing device according to a third embodiment. It is AA sectional drawing of FIG. It is the figure seen from the X direction of FIG. FIG. 10 is an explanatory view showing the operation of the protrusion according to the third embodiment. FIG. 10 is an explanatory view showing the operation of the protrusion according to the third embodiment. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2, 2a Cover 2o Wall-shaped outer peripheral part 3 Disc tray 3o Tray opening part 3ot Opening edge part 3p Arrangement | positioning surface 5 Electric motor 6 Pickup 7 Circuit board 8 Electric / electronic component 14 Disc 18 ₁ 1st space 18 ₂ Second space 20, 21, 22, 23 Protrusion 30, 30a, 31, 31a, 31b Air introduction passage 30t Air introduction passage edge 40 Air discharge port 40A, 41A Air discharge portion 45 Introduction portion 50 Air outlet passage 60, 61 62 Air suction unit 100 Disc playback device 101, 101a, 101b Device main body

Claims (5)

A disk placement section having a placement surface for placing the disk;
Disk drive means for rotating the disk;
An air suction portion for allowing air below the arrangement surface to flow above the arrangement surface with respect to the air flow based on the differential pressure generated with the rotation of the disk;
A difference between the outer peripheral portion and the inner peripheral portion of the disk that is formed in a tubular shape by a bottom portion provided on a side corresponding to the disk and that generates a differential pressure by using the air flow. Pressure generating means;
A second air suction portion provided in the disk placement portion, for allowing air above the placement surface to flow downward from the placement surface;
A disc playback apparatus comprising: A disk placement section having a placement surface for placing the disk;
Disk drive means for rotating the disk;
An air suction portion for allowing air below the arrangement surface to flow above the arrangement surface with respect to the air flow based on the differential pressure generated with the rotation of the disk;
An air introduction passage formed in a tubular shape by a bottom portion provided on a side corresponding to the disk, for guiding the air sucked from the air suction section to the center of the disk, and using the flow of the air Differential pressure generating means for generating pressure,
A second air suction portion provided in the disk placement portion, for allowing air above the placement surface to flow downward from the placement surface;
A disc playback apparatus comprising: To claim 1 or 2, further comprising a third air suction portion for sucked air from one space partitioned by the disk and disk placement unit to place the disc into the center of the disc The disc reproducing apparatus described. The differential pressure generating means is provided on the lid that protects the disk during rotation,
Out of the space partitioned by the disk and the disk arrangement part for arranging the disk, the air in the first space where the heat source is arranged is sucked out from the air suction part,
The discharged air in the first space is discharged to the outside in the radial direction of the disk while being brought into contact with the lid, and is guided from the second air suction portion to the first space. The disc reproducing apparatus described. And the disc, the distance between the facing surface that faces the disk in the cap body, according to claim 1 or 2, characterized in that towards the outer peripheral portion of said disc is smaller than the inner periphery of the disc Disc playback device.

Images