JP4516396B2 - Electronic equipment - Google Patents

Description

  The present invention relates to an electronic device in which a circuit board is housed in a housing, and more particularly to a cooling structure for such an electronic device.

  As an electronic apparatus in which a circuit board is housed in a housing, a disk apparatus that reproduces or records / reproduces an optical disk such as a DVD (Digital Versatile Disk) or a CD (Compact Disc) is widely used. Such a disk device generally has a substantially box-shaped housing, and in this housing, a disk rotation driving means for rotating the optical disk, and light for recording information on the optical disk or reproducing information recorded on the optical disk. A reproducing unit having a pickup and a moving unit (not shown) for moving the reproducing unit relative to the optical disc are accommodated. In general, an electric component that controls such various driving means generates heat when operating.

  In addition to causing malfunctions, this heat causes a decrease in durability, so it is necessary to actively dissipate heat. On the other hand, various driving means as described above have very small and precise mechanisms. Therefore, it is vulnerable to dust intrusion, and therefore requires a highly reliable dustproof measure.

  FIG. 9 is a side sectional view showing a conventional electronic device. 10 is a cross-sectional view taken along the line XI-XI in FIG. FIG. 11 is a cross-sectional view taken along line XX in FIG. 9 to 11, the conventional electronic device 101 houses a frame 11 inside the housing 2. The frame 11 has a substantially square frame shape that opens at both end surfaces in the axial direction, that is, in the vertical direction in FIGS. 9 and 11. A circuit board 81 is provided surrounded by the frame body 11. An electrical component 82 is mounted on the circuit board 81.

  The circuit board 81 functions as a partition plate that partitions the inside of the housing 2 into a machine chamber 2a and an air passage chamber 2b. In the machine room 2a, for example, a main body (not shown) that constitutes a main part of the electronic device 101 such as the above-described various driving means is accommodated. As shown in FIGS. 10 and 11, a pair of soft members 92 made of sponge, urethane, or the like extends in the longitudinal direction of the housing 2 between the circuit board 81 and the bottom surface of the housing 2. Has been. The bottom surface of the housing 2, the pair of soft members 92 and the circuit board 81 cooperate to form the air passage chamber 2 b. A cooling fan 13 communicates with the air passage chamber 2b through a connecting passage 16.

  The circuit board 81 is mounted with an electric component 82 as a heat generating component so as to be exposed to the air passage chamber 2b, and a through hole 83 through which cooling air passes is formed. When the cooling fan 13 is actuated, external air is sucked into the air passage chamber 2b as indicated by an arrow in the figure, and circulates inside the air passage chamber 2b as cooling air. Since the electrical component 82 is exposed to the air passage chamber 2b, it is cooled by the cooling air.

  In the electronic device 101 having such a configuration, the circuit board 81 is used as a partition plate, and the electric component 82 mounted on the circuit board 81 is exposed to the air passage chamber 2b and cooled by cooling air. The substrate 81 and the electrical component 82 can be efficiently cooled (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2003-100069

  In the conventional electronic device 101 having the structure shown in FIGS. 9 to 11, the soft member 92 must be attached to the back surface of the circuit board 81 in the manufacturing process. This operation is a difficult operation that must be pasted so as not to interfere with structures (not shown) on the circuit board 81 including the through holes 83 and the electrical components 82. Therefore, there is a need for an improvement that improves this point, and if possible, can obtain the same effect without requiring the soft member 92.

  The present invention has been made in view of such problems, and can efficiently cool the circuit board in the housing and the electrical components mounted on the circuit board, and reduce the number of parts to reduce the cost. It is an object of the present invention to provide an electronic device that can be realized.

To solve the above problems and achieve the object, the electronic apparatus according to claim 1, a housing for accommodating at least the heat generating electrical components, are accommodated in a housing, a frame shape having at least two opposite side portions forms a frame for partitioning the interior of the housing the lower end sides of the two side portions are respectively in contact with the bottom surface of the housing, is arranged inside the frame, the space of the frame body accommodating a main body portion And a wind passage chamber through which outside air can be circulated. In the air passage chamber, the air passage chamber is formed together with the bottom surface of the casing and the two side surfaces of the frame, and the heat generating electrical components are arranged in the air passage. a circuit board mounted in a state exposed to the chamber, it is arranged in the room communicating with the air passage chamber in the housing, and having a cooling fan for circulating outside air to the air passage chamber.

  Embodiments of an electronic device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In the following, structural features of the electronic device of the present invention will be described as embodiments, and then examples relating to the electronic device will be described.

[Embodiment]
FIG. 1 is a side sectional view showing an electronic device according to the present embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1 to 3, the electronic device 1 according to the present embodiment houses a frame 11 inside a box-shaped housing 2. The frame 11 has a substantially square frame shape that opens at both end surfaces in the axial direction, that is, the vertical direction in FIGS. 1 and 3. Inside the housing 2, a circuit board 81 is disposed so as to be surrounded by the frame body 11 (a portion filled with light ink in FIG. 2). On the circuit board 81, an electrical component 82 which is a heat generating component is mounted.

  The circuit board 81 functions as a partition plate that partitions the inside of the housing 2 into a machine chamber 2a and an air passage chamber 2b. In the machine room 2a, a main body (not shown) constituting the main part of the electronic device 1 is accommodated. As shown in FIG. 3, the ends on the air channel chamber 2 b side of the two side surfaces facing each other of the frame body 11 extend toward the bottom surface of the housing 2 and are in close contact with the bottom surface of the housing 2 over the entire length. On the other hand, the peripheral edge portion 81 a of the circuit board 81 is connected to the two side surface portions of the frame body 11 through attachment ribs. The bottom surface of the housing 2, the two side surfaces of the frame 11, and the circuit board 81 cooperate to form the air channel chamber 2 b described above.

  The circuit board 81 is mounted so that the electrical component 82 is exposed to the air passage chamber 2b. A cooling fan 13 communicates with the air passage chamber 2b through a connecting passage 16. When the cooling fan 13 operates, the inside of the air passage chamber 2b is depressurized, and external air is sucked into the air passage chamber 2b as indicated by an arrow in the figure. And the inside of the air channel chamber 2b distribute | circulates as cooling air. Since the electrical component 82 is exposed to the air passage chamber 2b, it is cooled by this cooling air.

  In the electronic device 1 having such a configuration, the circuit board 81 is used as a partition plate to form the air passage chamber 2b, and the electrical component 82 mounted on the circuit board 81 is exposed to the air passage chamber 2b. The circuit board 81 and the electrical component 82 are efficiently cooled by the outside air flowing through the air passage chamber 2b. Further, it is possible to reduce the number of soft members conventionally used for forming the air passage chamber 2b, to reduce the number of parts and to reduce the cost, and to eliminate the work of attaching the soft members. The assembly process is reduced, and the cost can be further reduced.

  Further, the peripheral edge 81a of the circuit board 81 has a complicated shape in which a semicircular or rectangular cut is provided (only the semicircular cut is shown in FIG. 2), but the frame 11 is formed of the circuit board 81. It is formed along the peripheral edge 81a. As a result, the air passage chamber 2b is a sealed space and more reliably blocks dust from entering.

In this embodiment, the configuration of the present invention is applied to a disk device as an embodiment of the electronic device of the present invention.
FIG. 4 is a perspective view of a disk device according to an embodiment of the electronic device of the present invention. FIG. 5 is an exploded perspective view showing the configuration of the disk device shown in FIG. FIG. 6 is a plan view in which a part of the disk device shown in FIG. 4 is deleted. FIG. 7 is a perspective view showing a state of the cooling air flowing through the air passage chamber and the air passage chamber when the frame body is viewed from the lower surface side of the housing. FIG. 8 is a perspective view showing a state of the circuit board viewed from the same direction as FIG.

  The disk device 1 has a substantially rectangular flat and rectangular metal housing 2. The housing 2 has two large area surfaces, a medium area surface, and a small area surface. In the description, the upper large area surface in the drawing is the upper surface, the lower large area surface in the drawing is the lower surface, the two middle area surfaces are side surfaces, and in the case of FIG. The small area part on the right side in the opposite figure is called the back surface. Similarly, the upper part of the figure is called “up” and the lower part of the figure is called “lower”. Other figures follow this. However, this is easy to understand when called in this way for convenience, and this designation does not limit the direction in which the apparatus is installed or the direction in which it operates.

  In FIG. 5, the housing 2 includes an upper housing 3 having a lower surface and a front surface that are open over two surfaces, a lower housing 4 that closes the lower surface of the upper housing 3, and a bezel that closes the front surface of the upper housing 3. 5. The bezel 5 is provided with a switch operation unit 5b and an operation confirmation window 5c. Further, below the bezel 5, a slit-like air inlet 5 d for inflowing external air extends in the left-right direction of the bezel 5 and is perforated.

  The upper housing 3 includes a top plate portion 3a, side plate portions 3b and 3b that are bent substantially vertically on both side edges in the longitudinal direction of the top plate portion 3a, and a side plate on one end edge in the longitudinal direction of the top plate portion 3a. It is comprised by the end plate part 3c bent substantially perpendicularly in the same direction as the parts 3b and 3b, and is formed by opening the lower surface and the front surface. At the lower edge of the side plate portions 3b, 3b of the upper housing 3, there is provided a mounting piece portion 3d provided by bending and having a screw hole (not shown). An exhaust port 3e for allowing a cooling fan, which will be described later, to escape the cooling air to the outside, is perforated at the approximate center of the end plate portion 3c. On the other hand, the lower housing 4 has a flat plate shape that is substantially the same size as the top plate portion 3a of the upper housing 3, and is attached to the screw hole 4a at a position corresponding to the mounting piece portion 3d of the top plate portion 3a. A dowel 4b is provided.

  In the housing 2, a substantially rectangular frame-shaped frame body 11 made of synthetic resin is disposed. As shown in FIGS. 5 to 7, the frame body 11 is provided on the side surfaces 11 a and 11 a facing the inner surfaces of the side plate portions 3 b and 3 b of the upper housing 3 and the inner surface of the end plate portion 3 c of the upper housing 3. It bridge | crosslinks to the edge part on the opposite side to the end surface part 11b of the side surface parts 11a and 11a, the support rib 11c which protrudes inward toward the inner surface side of the side surface parts 11a and 11a and the end surface part 11b. The opening / closing drive arrangement portion 11d is provided in the above-described manner, and is formed in a substantially square frame shape that opens both end faces in the axial direction. Further, on the side surface portions 11 a and 11 a of the frame body 11, there are provided mounting rib portions 11 e that are clamped and screwed between the mounting piece 3 d of the upper housing 3 and the mounting dowel 4 b of the lower housing 4. . The side surface portions 11a and 11a of the frame body 11 of the present embodiment are shaped so as to closely contact each other over the entire length when the mounting rib portion 11e is screwed and fastened to the lower housing 4.

  Here, the phrase “frame shape” of the substantially rectangular frame-like frame body 11 is used to represent a shape surrounding a predetermined space with a wall surface having a predetermined height. Of course, the frame 11 on the side of the bezel 5 is lower in the axial direction than the other three walls as in the frame 11 of the present embodiment, and is not limited to the one completely surrounding the periphery. Including those that are partially cut. That is, the frame 11 of the present embodiment is formed in a substantially square frame shape that opens both end faces in the axial direction, but is not limited to completely surrounding the periphery, but is partially cut. Even if it exists, the substantially same effect can be acquired.

  Furthermore, the frame body 11 is provided with a duct portion 12. The duct portion 12 has a concave duct concave portion 12a with an opening facing outward at the center of the outer surface side of the end surface portion 11b, and a lower surface side of the support rib 11c that communicates with the duct concave portion 12a and protrudes from the end surface portion 11b. And a duct hood portion 12b that continuously and integrally projects.

  And in this frame 11, the cooling fan 13 is arrange | positioned in the duct recessed part 12a of the end surface part 11b. The cooling fan 13 is supported by a rib 14 protruding from the opening edge of the duct recess 12a, and is arranged in a state where the intake side communicates with the duct recess 12a in a substantially airtight manner.

  A main body 20 is disposed on the frame 11. The main body 20 has a pedestal 21 formed in, for example, a metal flat frame shape. As shown in FIGS. 5 and 6, the pedestal portion 21 is attached to the support rib 11 c protruding from the end surface portion 11 b of the frame body 11 with one edge being screwed so that the other edge can be turned up and down. Yes. A rotation guide portion 22 is integrally attached to one edge of the pedestal portion 21. The rotation guide portion 22 includes a longitudinal attachment holding portion 22a along one edge of the pedestal portion 21 to which the pedestal portion 21 is integrally attached by screws, and both ends of the attachment holding portion 22a in the longitudinal direction. It has a pair of rotating arm portions 22b that are integrally projected substantially vertically and whose ends are pivotally supported by support ribs 11c protruding from the side surface portions 11a of the frame body 11. The pedestal 21 is guided to rotate by the rotation guide 22.

  Further, the pedestal portion 21 is provided with a disk rotation driving means 25 located on the one edge side that rotates. As shown in FIGS. 5 and 6, the disk rotation driving means 25 includes a rotation electric motor 26 such as a spindle motor, and a turntable 27 provided integrally with an output shaft 26 a of the rotation electric motor 26. And have. The turntable 27 has a substantially cylindrical rotary shaft (not shown) that is fitted into a shaft hole formed in the center of the optical disc, and a flange-like projecting projection on the outer peripheral surface of the rotary shaft. And a flange portion 27b on which the periphery is placed. A magnet 29 is embedded at the tip of the rotating shaft of the turntable 27.

  The pedestal portion 21 is provided with moving means 31. The moving means 31 includes a pair of guide shafts 32 and a moving electric motor 33. The pair of guide shafts 32 are disposed with an axial direction in a direction from the other edge on which the pedestal portion 21 is pivotally supported toward one edge on the rotating side. Furthermore, the electric motor 33 for movement is disposed in a state where the axial direction of the output shaft 33 a is along the axial direction of the guide shaft 32. On the outer peripheral surface of the output shaft 33a of the electric motor 33 for movement, an engagement groove (not shown) is provided in a spiral shape.

  Further, the moving means 31 is provided with a reproducing means 41. The regeneration means 41 has a movement holding portion 42 that is held in a state of being bridged by the pair of guide shafts 32. The movement holding portion 42 is provided with a holding restriction portion 43 that is movably inserted into the guide shaft 32 and a movement restriction claw portion (not shown) that engages with the engagement groove of the output shaft 33a of the electric motor 33 for movement. . Further, the movement holding unit 42 of the reproducing means 41 is provided with a light source (not shown), a lens 45 for converging light from the light source, and an optical sensor (not shown) for detecting light reflected from the optical disk. .

  Further, as shown in FIG. 5, the frame body 11 is provided with a rotor support member 51 that is formed, for example, in the shape of a metal plate and is fixed with screws in a state of being bridged between the side surface portions 11a and 11a. . The rotor support member 51 is provided with a concave support concave portion 52 at an approximate center at a position facing the turntable 27 of the disk rotation driving means 25 upward. A support hole 53 is formed in the approximate center of the support recess 52. A rotor 55 is rotatably mounted in the support recess 52 of the rotor support member 51. The rotor 55 has a substantially disk shape, and its outer peripheral edge is formed to be engageable with the peripheral edge of the support hole 53. Further, a magnetic material (not shown) such as a metal plate is integrally attached to the rotor 55, and the rotor 55 holds the optical disk with the turntable 27 by the magnetic force of the magnet 29 of the turntable 27.

  On the other hand, the frame 11 is provided with a disc tray 61 that moves inside the frame 11 so as to be movable in the horizontal direction above the support ribs 11c. The disc tray 61 is formed in, for example, a synthetic resin plate shape, and has a substantially rectangular plate-like tray portion 62 having openings corresponding to the disc rotation driving means 25 and the reproducing means 41 of the main body portion 20. Yes. On one end side in the longitudinal direction of the tray portion 62, there is provided a mounting recess 62a on which an optical disk is mounted in a circular concave shape that expands upward. Further, a longitudinal plate-like window closing plate portion 65 that is formed of the same material as the bezel 5 and closes the window portion 5a of the bezel 5 of the housing 2 is detachable at one edge of the tray portion 62 in the longitudinal direction. Is attached.

  Further, the frame body 11 is provided with opening / closing driving means 71 located at the opening / closing driving arrangement portion 11d. The opening / closing driving means 71 includes a drive transmission pulley 72 that is engaged with each other and rotatably supported by the opening / closing drive arrangement portion 11d, a drive transmission gear 73 that engages with the drive transmission pulley 72, and the drive transmission gear. 73 and a moving gear 74 that engages with the disc tray 61. Further, the opening / closing drive means 71 is provided with an in / out electric motor 75. A pulley is integrally provided on the output shaft 75 a of the electric motor 75 for entering / exiting. An endless belt 77 is stretched between this pulley and the drive transmission pulley 72, and the pulley, the drive transmission pulley 72, the drive transmission gear 73, and the moving gear 74 are rotated by the driving of the electric motor 75 for entry and exit, and the disc tray 61 is Moved.

  Further, the opening / closing drive means 71 has a moving cam 78 disposed on the opening / closing drive arrangement portion 11d of the frame 11 so as to be movable along the opposing direction of the side surface portions 11a, 11a. The movable cam 78 engages with the rotation guide portion 22 that is integrally attached to the pedestal portion 21, and also engages with the drive transmission gear 73, and the drive transmission gear 73 is driven by the drive-in / out electric motor 75. When rotating, the moving cam 78 moves to rotate the pedestal portion 21 in the vertical direction. The moving cam 78 rotates the pedestal portion 21 upward in a state where the disc tray 61 is retracted and is positioned in the frame 11, and when the disc tray 61 moves forward and backward, the pedestal portion 21 is moved downward. It is rotated so as not to interfere with the disc tray 61. The disk rotation driving means 25, the moving means 31, the reproducing means 41, and the opening / closing driving means 71 described above constitute the main body portion 20.

  In addition, a circuit board 81 is attached to the frame 11 as shown in FIGS. The circuit board 81 is detachably attached by a board attachment claw portion (not shown) provided on the frame body 11. The peripheral edge portion 81 a of the circuit board 81 has a complicated shape that matches the side surface portion 11 a of the frame body 11. As shown well in FIG. 7, for example, when the disk device 1 is attached to a personal computer or the like, the frame 11 in a portion that interferes with the attachment screw is provided on the side portions 11a and 11a with a semi-cylinder for the purpose of avoiding this. A shaped relief portion 11f is formed. Accordingly, a semicircular relief portion 81b that engages with the outer peripheral surface of the relief portion 11f is also formed on the peripheral edge portion 81a side of the circuit board 81 as shown in FIG.

  A control circuit having an electrical component 82 as a heat generating component that controls the operation of the main body 20 is mounted on the circuit board 81. The circuit board 81 is attached in a state in which the circuit board 81 is attached to the frame body 11, and particularly in a state in which the electrical component 82 that generates a large amount of heat is opposed to the inner surface of the lower housing 4 of the housing 2 on the side opposite to the main body 20. It is done. That is, in the state where the circuit board 81 is attached to the frame body 11, the machine room 2 a in which the frame body 11 in which the main body portion 20 is disposed is accommodated in the housing 2. An air passage chamber 2b in which the electric component 82 is exposed is defined by a gap between the circuit board 81 and the inner surface of the lower housing 4 below.

  Thus, in the disk device 1 of the present embodiment, the frame body 11 has a complicated shape, but the peripheral edge portion 81a of the circuit board 81 is formed along the shape of the frame body 11 over the entire length. Yes. Further, the side surface portions 11a and 11a of the frame body 11 are shaped so as to closely contact each other over the entire length when the mounting rib portion 11e is screwed and fastened to the lower housing 4. Therefore, the air channel chamber 2b can be constructed without requiring a soft member that has been necessary in the past. As a result, the number of parts can be reduced and the cost can be reduced, and the attaching operation of the soft member is eliminated and the assembly process is reduced, so that the cost can be further reduced. The side surface portions 11a and 11a of the frame body 11 can suppress the intrusion of dust from the side surface of the housing as shown by the white arrow in FIG. 7 in cooperation with the circuit board 81.

  Further, the circuit board 81 is attached to the frame body 11, and as shown in FIG. 7, the peripheral edge that is the leading edge of the duct hood part 12 b of the duct part 12 of the frame body 11 is substantially airtight to the circuit board 81. It will be in close contact. The circuit board 81 is provided with a ventilation hole 83. Similarly, as shown in FIG. 7, the ventilation hole 83 is provided at a position surrounded by the duct hood portion 12 b of the duct portion 12, and the heat generation amount is relatively small in a state where the circuit board 81 is attached to the frame body 11. Ventilation holes 83 are provided on the downstream side in the flow direction of the outside air, which is closer to the intake side of the cooling fan 13 than the many electrical components 82. With this ventilation hole 83, the intake side of the cooling fan 13 communicates with the air passage chamber 2 b through the duct portion 12 and the ventilation hole 83.

  Further, the circuit board 81 is provided with a connector portion 85 to which a power line (not shown) and a cable for transmitting and receiving signals with various external electric machines are detachably connected. The connector portion 85 is disposed in a state of being located on the outer surface side of the end surface portion 11 b of the frame body 11 and facing the outside from the housing 2. Furthermore, the circuit board 81 is integrally mounted with an electric motor 75 for entering / exiting the opening / closing drive means 71 on the upper surface on the opposite side to the electrical component 82 that generates a particularly large amount of heat.

  Next, the operation will be described. First, power is supplied to the disk device 1. The cooling fan 13 is driven by this power supply. For example, when reading the information recorded on the optical disc, first, the switch operating portion 5b of the bezel 5 is operated. By operating the switch operation unit 5b, a switch (not shown) provided on the circuit board 81 is opened and closed, and the control circuit of the circuit board 81 drives the electric motor 75 for entering / exiting the opening / closing drive means 71. By driving the electric motor 75 for entering / exiting, the pulley 76, the drive transmission pulley 72, the drive transmission gear 73, and the moving gear 74 rotate, and the disc tray 61 that engages with the moving gear 74 advances from the window portion 5a of the bezel 5. Move in the direction. During this movement, the moving cam 78 of the opening / closing driving means 71 also moves, the rotation guide portion 22 engaged with the moving cam 78 rotates downward, and the pedestal portion 21 rotates downward. The main unit 20 is retracted so as not to interfere with the disc tray 61.

  The optical disc is placed in the mounting recess 62a of the advanced disk tray 61 with the recording surface of the optical disc facing downward. Thereafter, the switch operating portion 5b of the bezel 5 is operated again, the electric motor 75 for entering / exiting the opening / closing drive means 71 is rotationally driven, and the disc tray 61 is retracted into the window portion 5a. When the disc tray 61 is retracted, the retracted main body 20 is moved upward together with the pedestal 21 by the rotation guide 22 that engages the moving cam 78. By rotating the main body 20 upward, the rotation shaft 27a of the turntable 27 of the disk rotation driving means 25 is fitted into the shaft hole of the optical disk. Further, the optical disk is sandwiched and fixed between the turntable 27 and the rotor 55 by the magnetic force of the magnet 29 of the turntable 27.

  In this state, the control circuit of the circuit board 81 controls the main body 20, and the information recorded on the optical disk rotated by the rotating electric motor 26 of the disk rotation driving means 25 is appropriately moved by the moving means 31. Read by the optical pickup of the reproducing means 41.

  During the operation of the disk device 1, the electrical component 82 that constitutes the control circuit of the circuit board 81 generates heat. The heat of the generated electric component 82 is radiated to the outside by the cooling air flowing through the air passage chamber 2b. That is, when the cooling fan 13 is driven, the duct portion 12 on the intake side of the cooling fan 13 is in a negative pressure state with respect to the atmospheric pressure. Due to the negative pressure state of the duct portion 12, the inside of the air passage chamber 2 b communicating with the duct portion 12 through the ventilation hole 83 is in a negative pressure state. Due to the negative pressure state of the air passage chamber 2 b, outside air is sucked from the air inlet 5 d formed in the bezel 5. Thus, as shown in FIGS. 6 and 8, the sucked outside air flows through the air passage chamber 2b and comes into contact with the electrical component 82 exposed to the air passage chamber 2b. The outside air in contact with the electric component 82 cools the electric component 82 by heat exchange. The outside air warmed by heat exchange flows through the ventilation holes 83 to the duct portion 12 and is exhausted from the exhaust port 3e to the outside air as exhaust air by the cooling fan 13.

As described above, the disk device of the present embodiment has the following operational effects.
That is, the circuit board 81 having the electrical component 82 that constitutes a control circuit that controls the operation of the main body 20 disposed in the frame 11 is communicated with the machine chamber 2 a that houses the main body 20 and the intake side of the cooling fan 13. The air passage chamber 2b through which the outside air can be circulated is partitioned in the housing 2, and the electric component 82 is disposed so as to be exposed to the air passage chamber 2b. For this reason, while preventing dust from entering the main body 20 side, the electrical components 82 of the circuit board 81 are sucked by the driving of the cooling fan 13 and efficiently contacted with the outside air flowing through the air passage chamber 2b for cooling. In addition, the cooling efficiency of the circuit board 81 can be improved.

  Further, the peripheral edge portion 81a of the circuit board 81 has a shape along the frame body 11 over the entire length, while the side surface portions 11a and 11a of the frame body 11 are screwed to the mounting rib portion 11e to be attached to the lower housing. When fastened to the body 4, it is shaped so as to be in close contact with the entire length without any gap. Therefore, the air channel chamber 2b can be constructed without requiring a soft member that has been necessary in the past. As a result, the number of parts can be reduced and the cost can be reduced, and the attaching operation of the soft member is eliminated and the assembly process is reduced, so that the cost can be further reduced. Further, since the side surface portions 11a and 11a of the frame body 11 are in close contact with the lower housing 4 without gaps, dust from the side surface direction of the housing 2 is more reliably blocked, and in cooperation with the circuit board 81, the machine room 2a. Suppresses the ingress of dust.

  Then, the circuit board 81 is attached in a state where the opening is hermetically sealed on one surface side of the frame-like frame body 11 having both end faces in the axial direction. For this reason, the circuit board 81 can be used as a configuration for covering the machine room 2a in the frame body 11 in which the main body portion 20 is disposed in order to prevent the occurrence of problems due to dust. The size in the vertical direction can be reduced, and the productivity can be easily improved and the lighter and smaller size can be easily achieved.

  Furthermore, the air intake side of the cooling fan 13 is connected to the air passage chamber 2b on the circuit board 81 at a position closer to the air intake side of the cooling fan 13 disposed on the frame body 11 than the position of the electrical component 82 that generates a particularly large amount of heat. Ventilation holes 83 are formed as openings. For this reason, the cooling fan 13 is assembled to the frame body 11 and can be assembled together with the frame body 11 in the housing 2 when the disk device 1 is assembled and formed. As a result, assembly manufacturability can be improved and the cooling fan 13 can be driven reliably. Thus, it is possible to obtain a state in which the outside air sucked in is in contact with the electrical component 82, and the electrical component 82 can be efficiently cooled.

  In addition, the leading edge is in close contact with the circuit board 81 and continues to the support rib 11 c that supports the main body 20 of the frame 11, and the intake side of the cooling fan 13 and the ventilation hole 83 of the circuit board 81 are isolated from the main body 20. The surrounding duct portion 12 is provided. For this reason, the negative pressure with respect to the atmospheric pressure can be efficiently generated on the intake side by driving the cooling fan 13, and the outside air can be satisfactorily sucked into the cooling fan 13 from the air passage chamber 2b through the ventilation hole 83, and the electric component 82 is made efficient. Can cool well. Further, since the duct portion 12 is provided continuously to the support rib 11c, it is not necessary to separately provide the structure of the duct portion 12 using the support rib 11c, the structure can be simplified, and the productivity of the frame 11 can be improved. Improvement and lightweight reduction can be achieved easily. Moreover, since the duct part 12 adheres to the circuit board 81, rattling can also be suppressed.

It is a sectional side view which shows the electronic device of this Embodiment of this invention. It is arrow sectional drawing which follows the II-II line | wire of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. 1 is a perspective view of a disk device according to an embodiment of the electronic device of the present invention. FIG. 5 is an exploded perspective view showing the configuration of the disk device shown in FIG. 4. FIG. 5 is a plan view in which a part of the disk device shown in FIG. 4 is deleted. It is the perspective view which shows the mode of the cooling air which flows through the air channel chamber which looked at the frame body from the lower surface side of the housing | casing, and an air channel chamber. It is a perspective view which shows the circuit board mode seen from the same direction as FIG. It is a sectional side view which shows the conventional electronic device. FIG. 10 is a cross-sectional view taken along the line XI-XI in FIG. 9. FIG. 10 is a cross-sectional view taken along the line X-X in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disk apparatus 2 Case 2a Machine room 2b Air channel room 5d Air inflow port 11 Frame body 12 Duct part 13 Cooling fan 16 Connection part 17 Connection part 20 Main body part 25 Disk rotation drive means 31 Movement means 41 Reproduction means 81 Circuit board 81a Circuit board peripheral edge 82 Heating electrical component 83 Ventilation hole

Claims (4)

A housing for storing at least heat-generating electrical components;
Wherein is housed in a casing, a frame body which forms a frame shape, the lower end side of the second side portion respectively contact with the bottom surface of the housing dividing the interior of said housing having at least two opposite side portions,
The space disposed in the frame body divides the space in the frame body into a machine room that houses the main body portion and an air passage chamber through which outside air can circulate. A circuit board that forms the air passage chamber together with the bottom surface and the two side surfaces of the frame, and that is mounted in a state in which the heat generating electrical component is exposed to the air passage chamber;
Before disposed in the room that communicates with the air passage chamber Kikatami body, an electronic device characterized by having a cooling fan for circulating outside air into the air path chamber. The main body has disk rotation driving means for rotating a disk, reproducing means for reproducing information recorded on the disk, and moving means for moving the reproducing means relative to the disk,
The electronic device according to claim 1, wherein the heat generating electrical component controls an operation of the main body. The frame is formed along the peripheral edge of the circuit board,
The electronic device according to claim 1, wherein a peripheral edge portion of the circuit board is connected to two side surface portions of the frame body via attachment ribs . The cooling fan is disposed in the frame body, and the circuit board is formed in an opening at a position closer to an intake side of the cooling fan than a position of the heat generating electrical component, and an intake side of the cooling fan is formed in the air passage chamber. The electronic device according to claim 1, further comprising a vent hole for communication.

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