JP2006066037A - Recording and reproducing apparatus provided with cooling structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording and reproducing apparatus which is excellent in practicality in which cooling is performed efficiently by guiding a cooling air using electronic parts surrounded by shield plates constituting the apparatus, while interference of noise between substrate circuits themselves is prevented by the electronic parts in a cooling structure using a cooling fan to exhaust the heat discharged from an HDD unit or the like incorporated in a case, to the outside of the case. <P>SOLUTION: A digital circuit block 74 is arranged at one side of main circuit substrates 70 and an analog circuit block 71 is arranged at the other side, a heat generation part 3 such as a HDD unit 31 is arranged at the one side and a cooling fan 4 is arranged at the back of the heat generation part 3, a tuner unit 50 surrounded by the shield plate 51 functions as a guiding wall 5 of a cooling air 6 in a boundary between the analog circuit 71 and the digital circuit 74, while noise interference between the circuits 71 and 74 is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling structure of a recording / reproducing apparatus that discharges heat released from an HDD unit, a DVD unit, or the like housed inside a housing to the outside of the housing using a cooling fan, and is made of a metal that constitutes the device. A recording / reproducing apparatus that efficiently cools by inducing cooling air using an electronic component surrounded by a shield plate and prevents noise interference between the digital circuit block and the analog circuit block by the electronic component About.

  Conventionally, as a method of cooling the interior of an electronic device housing that houses a heat generating part, a partition plate is arranged between the heat generating part and the discharge port to create a cooling air flow path, and heat is transferred to the outside by a cooling fan. A method of discharging is known.

  For such a cooling structure of the electronic device casing, for example, the following conventional techniques have been proposed. In Patent Document 1, as shown in a side sectional view showing a cooling device for an electronic device shown in FIG. 4, a mechanical deck 104 which is a first heat generating member 101 such as an optical pickup or a disk drive device, and a second An IC 106 planted on a printed circuit board 107 as a heat generating member 102 and a guide member 109 for guiding an air flow 108 provided between a plurality of heat generating members such as a power supply circuit 105 as a third heat generating member 103 are provided. The cooling air of the cooling fan 110 is blown to the desired first heat generating member 101 among the heat generating members, and forced air cooling is performed, and the air is blown toward the guide member 109 to be different from the desired heat generating member 101. The three heat generating members 102 and 103 are cooled by natural air cooling with a negative pressure generated at the end of the guiding member 109 by blowing air to the guiding member 109. This induction member 109 also serves as a shielding plate between circuits. Permalloy having a high magnetic permeability is used for electromagnetic shielding, and a member such as copper having high conductivity is used for electrostatic shielding. A method using a highly heat-insulating member has been proposed for shielding the radiant heat from the heat.

JP-A-11-112177

  According to the prior art, a mechanical deck 104 that is a first heat generating member 101 such as an optical pickup or a disk drive device in a casing 100, and an IC 106 that is planted on a printed circuit board 107 that is a second heat generating member 102; A guide member 109 for guiding an air flow 108 provided between a plurality of heat generating members such as a power supply circuit 105 which is a third heat generating member 103 is provided, and a cooling fan 110 is disposed on the first heat generating member 101 to Cooling air is blown using the intake air of the cooling fan 110 to cause forced air cooling, and the cooling air after the forced cooling is blown toward the guide member 109 to be blown. The second and third heat generating members 102 and 103 are cooled by natural air cooling by the air flow generated by the negative pressure generated in the section. As a result, the plurality of heat generating members 101, 102, 103 can be effectively cooled by a single cooling fan, and the induction member 109 has a shielding effect against radiation due to electromagnetic waves between circuits, an electrostatic shielding effect against static electricity, and heat generation. Although the heat insulation effect with respect to the radiant heat from a part can be acquired, since the said guide member 109 needs to prepare and arrange | position a separate plate-shaped member newly, there exists a problem that cost becomes high. The plurality of heat generating members 101, 102, and 103 in the casing 100 preferentially consider the cooling air flow path 108, such as the forced cooling zone 111 and the natural air cooling zone 112 are separated by the guide member 109. This requires a complicated arrangement and hinders the casing 100 from being made compact.

  According to the present invention, in the cooling structure according to the prior art, the problem of high cost due to the necessity to prepare and arrange the guide member 109 by the separate plate member is to use the electronic component 106 constituting the electronic device. The function of the induction member 109 is also used to avoid the above problem, and the plurality of heat generating members 101, 102, and 103 in the casing 100 also preferentially considers the cooling air flow path 108 and the induction member 109. Since the cooling fan 110 is attached at a position where the cooling fan 110 is exhausted from the casing 100, the heat generating members 101, 102, and 103 can be prevented from being adversely affected by downsizing the casing 100. The heat generating members 101 and 10 can be efficiently eliminated by creating a cooling air flow path 108 for releasing the heat of the heat. , And to provide a method of cooling a 103.

  The recording / reproducing apparatus provided with the cooling structure according to claim 1, wherein a heat generating unit such as a DVD unit or an HDD unit disposed on one side of the housing, an analog circuit block disposed on the other side of the housing, and the heat generation In a recording / reproducing apparatus including a cooling fan that discharges the heat released from the housing to the outside of the housing, the cooling fan is disposed at a discharge port that is open at the back of the housing at the boundary between the heat generating portion and the analog circuit block. A guide wall that guides cooling air from the cooling fan is provided at a boundary with the analog circuit block, and a guide wall that guides cooling air from the cooling fan is disposed near the analog circuit block at the boundary. The guide wall is a tall electronic component constituting the recording / reproducing apparatus.

  According to the configuration of the first aspect of the present invention, the recording / reproducing apparatus having the cooling structure includes the cooling fan that discharges the heat released from the heat generating part to the outside of the housing, and the cooling fan is the heat generating part. And the analog circuit block at the boundary of the analog circuit block. The heat is discharged from the heat generating part to the outside of the casing through the outlet of the casing, and the cooling is performed. An induction wall for inducing cooling air by the fan is provided at the boundary with the analog circuit block, and a cooling air flow path for inducing the air heated by the heat generating portion to the cooling fan is formed by the induction wall. Therefore, the heat generating part can be efficiently cooled. In addition, the guide wall is a structure in which tall electronic components constituting the recording / reproducing apparatus are arranged, and there is no need to newly provide a separate guide wall. Costs can be reduced because they are not required.

  The recording / reproducing apparatus having the cooling structure according to claim 2 of the present invention is the recording / reproducing apparatus having the cooling structure according to claim 1, wherein the electronic component is a tuner unit surrounded by a metal shield plate. Features.

  According to the configuration of the second aspect, since the electronic component arranged as the guide wall is a tuner unit surrounded by a metal shield plate, the digital signal of the HDD unit or the DVD unit that is the heat generating portion is used. Mutual noise interference in which analog signals in the analog circuit block interfere with each other in frequency can be blocked by a tall tuner unit surrounded by the metallic shield plate.

  The recording / reproducing apparatus having the cooling structure according to claim 3 of the present invention is the recording / reproducing apparatus having the cooling structure according to claim 1 or 2, wherein the analog circuit block includes a power supply circuit unit and an analog control circuit unit. The power supply circuit unit is disposed at a boundary with the heat generating unit.

  According to the configuration of the third aspect, since the power supply circuit unit is arranged at the boundary with the heat generating unit, particularly between the HDD unit and the DVD unit that are the digital signals and the power supply circuit. Noise interference can be effectively blocked by a metallic shield plate surrounding the tall tuner unit.

  According to the recording / reproducing apparatus having the cooling structure according to claim 1, the recording / reproducing apparatus includes a cooling fan at an outlet opening in the rear surface of the housing at a boundary between the heat generating portion and the analog circuit block. And an induction wall for inducing cooling air from the cooling fan is provided at the boundary with the analog circuit block, and the air heated by the heat generating portion by the induction wall is effectively supplied to the cooling fan. Since the flow path of the cooling air to be guided is formed, the heat generating portion can be efficiently cooled. In addition, the guide wall is a structure in which tall electronic components constituting the recording / reproducing apparatus are arranged, and there is no need to newly provide a separate guide wall. Since it is not necessary, the cost can be reduced, and a space for providing a separate guide wall is not required, so that a compact recording / reproducing apparatus can be realized without hindering the compactness of the casing. Further, as in the conventional example, the plurality of heat generating members require a complicated arrangement considering the cooling air flow path preferentially, for example, the forced cooling zone and the natural air cooling zone are separated by the induction member. In addition, it is possible to avoid the problem that the casing is downsized.

  According to the invention of the recording / reproducing apparatus provided with the cooling structure according to claim 2, the electronic component arranged as the guide wall of the recording / reproducing apparatus is a tuner unit surrounded by a metal shield plate, The frequency interference between the digital signal of the HDD unit or DVD unit and the analog signal of the analog circuit block can be shielded by the metallic shield plate surrounding the tuner unit. Permloy, which has a high magnetic permeability, is not required for electromagnetic shielding, and a separate member such as copper, which is highly conductive, is not required for electrostatic shielding, and the induction wall is disposed near the cooling fan. Since the tuner unit is cooled by cooling air, it can shield heat between the heat generating part and the analog circuit block. Conventional without dare necessary to use such high heat insulation member separate as the shielding means of the various can be covered only by the tuner unit.

  According to the invention of the recording / reproducing apparatus provided with the cooling structure according to claim 3, the power supply circuit unit is arranged at the boundary with the heat generating unit, so that the HDD unit or the DVD unit which is particularly the digital system signal. Noise interference with the power supply circuit can be effectively shielded by a metallic shield plate surrounding the tuner unit, so that the recording / reproducing apparatus can be prevented from malfunctioning and the HDD unit. It is possible to prevent the video / audio signal of the DVD unit from being abnormal due to noise.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to other than those described in the embodiments without departing from the spirit of the invention.

  FIG. 1 is a schematic explanatory view showing a cooling air flow path formed by a cooling fan and a guide wall arranged in the recording / reproducing apparatus of the present invention. FIG. 2 is a block diagram showing the circuit configuration of the recording / reproducing apparatus in one embodiment of the present invention. FIG. 3 is a perspective view illustrating the inside of the recording / reproducing apparatus according to the present invention.

  First, the inside of the housing 2 of the recording / reproducing apparatus 1 shown in FIG. 2 will be described using a plan block diagram.

  In FIG. 2, the front side corresponds to the front surface of the recording / reproducing apparatus 1 housing 2 and the back side corresponds to the rear surface, and a plurality of blocks overlap to indicate a shaded area near the bottom surface of the housing 2. Slit air inlets (not shown) are formed on both side surfaces of the housing 2 so as to be dispersed in order to ventilate the housing 2. Further, the main circuit board 70 is disposed on the bottom surface side of the housing 2 from the left end of the drawing to the range of about 3/4 in the right direction, and the analog circuit block 71 occupies the left side thereof. A power supply circuit unit 72 is formed on the back side, and an analog control circuit unit 73 is formed on the front side. Further, a digital circuit block 74 is arranged on the right side from the approximate center of the main circuit board 70, and a DVD (Digital Vertile Disc) unit 30 and an HDD (Hard Disk Drive) unit 31 (not shown) built in the housing 2 are shown. A control circuit unit and the like are configured. Subsequently, a DVD unit 30 and an HDD unit 31 are arranged on the upper side of the main circuit board 70 from the right side of the figure, and the upper part of the HDD unit 31 conforms to the Moving Picture Experts Group standard for performing compression / decompression processing of video and audio signals. An MPEG circuit block substrate 32 based thereon is arranged. Further, a discharge port 60 is formed in the rear surface of the housing 2 at the boundary between the HDD unit 31 and the power supply circuit unit 72, and the cooling fan 4 is disposed here. Further, a tuner unit 50 that selects a predetermined signal from the received broadcast signal and converts it into an audible frequency is provided at the boundary with the power supply circuit unit 72.

  Next, the internal configuration of the housing 2 of the recording / reproducing apparatus 1 will be described with reference to FIG.

  FIG. 3 is a perspective view of the recording / reproducing apparatus 1 from the front side. As described above, the slit-like air inlets 61 are distributed on both side surfaces of the housing 2 and the main bottom side is arranged on the inner bottom side. A circuit board 70 is arranged, the DVD unit 30 is arranged on the upper right side of the main circuit board 70, and the HDD unit 31 is arranged adjacent to the left side of the DVD unit 30. Since the HDD unit 31 is thinner than the DVD unit 30, an MPEG circuit block substrate 32 is placed on the HDD unit 31. On the left rear side of the HDD unit 31, a discharge port (not shown) is opened on the rear surface of the housing 2, and a cooling fan 4 is disposed. In the recording / reproducing apparatus 1 of the present embodiment, in the main circuit board 70, the right side is the digital circuit block 74 with the left side of the HDD unit 31 as a boundary, and the analog circuit block 71 is arranged on the left side. The front side of the analog circuit block 71 is an analog control unit 73 and the back side is a power supply circuit unit 72. A tuner unit 50 that guides the cooling air 6 is provided in the vicinity of the cooling fan 4 along with the power circuit 72.

  Next, a cooling air flow path formed by a cooling fan arranged in the recording / reproducing apparatus housing and a guide wall by the tuner unit will be described with reference to FIG.

  In FIG. 1, the DVD unit 30 and the HDD unit 31 are heat generating portions 3 that release heat, and the MPEG circuit block substrate 32 placed on the HDD unit 31 also releases heat. In particular, the HDD unit has a sealed structure, and heat is likely to accumulate inside and is difficult to dissipate. Therefore, the HDD unit is disposed in the vicinity of the cooling fan in consideration of the cooling air flow path. The tuner unit 50 is tall and is surrounded by a metallic shield 51, and is arranged as a guide wall 5 for guiding the cooling air 6 from the cooling fan 4. Here, when the cooling fan 4 is operated, outside air is sucked into the housing 2 from the air inlets 61 arranged on both sides of the housing 2. The outside air sucked from the air inlet 61 on the right side surface (right side in the figure) of the housing 2 flows around the DVD unit 30 and the HDD unit 31 and the MPEG circuit block substrate 32 disposed in the housing 2. While being cooled, it is cooled by the cooling air 6 directed toward the cooling fan 4 and can be discharged out of the housing 2.

  In addition, the outside air sucked from the air inlet 61 on the left side surface (left side in the figure) of the casing 2 cools a power transformer (not shown) of the power circuit portion 72 constituting the analog circuit block 71, and then the tuner unit. 50 bypasses the guide wall 5, and the cooling air 6 passes through the vicinity of the HDD unit 31 that is difficult to release heat, and is discharged out of the housing 2 by the cooling fan 4. Can be cooled. Furthermore, by arranging the tuner unit 50, which is tall and surrounded by the metallic shield 51, as the guide wall 5, it is possible to block the radiant heat emitted from the heat generating part 3 such as the HDD unit 31, and the like. The tuner unit 50 itself is also in the vicinity of the cooling fan 4 and is forcibly cooled by the cooling air 6, so there is no possibility that the tuner unit 50 will be heated to a high temperature. As described above, the embodiment in which the cooling air 6 is taken in from the intake ports 61 formed on both side surfaces of the housing 2 and the heat in the housing 2 is discharged by the cooling fan 4 has been described. It is also possible to cool by flowing the cooling air 6 in the reverse direction by sucking air from the cooling fan 4 with 60 reversed. As a result, outside air is sucked from the cooling fan 4, the heat generating part 3 is cooled, and then heat is discharged out of the case 2 from the slit-shaped openings provided on both side surfaces of the case 2 serving as the air inlet 61. It becomes possible to do.

  The tuner unit 50 is an electronic component surrounded by a metal shield as described above, and has both an electromagnetic shielding effect and an electrostatic shielding effect. This is the boundary between the digital circuit block 74 of the main board 70 and the power circuit 72 of the analog circuit block 73, and the boundary area between the DVD unit 30 and the HDD unit 31, which are digital signal systems, and the MPEG circuit block board 32. By arranging them in this manner, it is possible to suppress frequency interference between digital signals and analog signals.

  As described above, according to this embodiment, the recording / reproducing apparatus 1 having the cooling structure of the present invention is located near the cooling fan 4 that discharges the heat released from the heat generating portion 3 as in the above-described embodiment. By arranging a tuner unit 50 which is also one of the electronic components constituting the recording / reproducing apparatus 1 as the guide wall 5 for guiding the flow of the cooling air 6, the casing 2 is cooled through the periphery of the heat generating portion 3. Since the flow path of the cooling air 6 guided to the fan 4 can be formed and the heat released from the heat generating part 3 can be efficiently discharged out of the housing 2, it is different from the conventional example. There is no need to prepare and arrange the body guiding member 109, and the cost for manufacturing such a separate body and the cost required for mounting the separate body are not required, so that the cost can be reduced. Further, according to the conventional example, the plurality of heat generating members 101, 102, and 103 in the casing 100 are configured such that the forced cooling zone 111 and the natural air cooling zone 112 are separated by the guide member 109, and the cooling air flow path 108. Therefore, the recording / reproducing apparatus 1 can be reduced in size and thickness because a complicated arrangement is required in consideration of the above-described problems and the problem of hindering the compactness of the casing 100 can be avoided. I can do it.

  The guide wall 5 is a tuner unit 50 surrounded by a metal shield that constitutes the recording / reproducing apparatus 1, and exhibits the effect of improving the cooling efficiency and has an electromagnetic shielding effect and an electrostatic shielding effect. In addition, since it is possible to suppress the frequency interference between the digital signal and the analog signal, it is not necessary to newly use a separate shielding plate to arrange the separate shielding plate. Since no cost is required, the cost can be reduced. Thereby, as in the conventional example, the induction member 109 also serves as a shielding plate between circuits, a high permeability permalloy for electromagnetic shielding, and a member such as copper having high conductivity for electrostatic shielding, It is not necessary to use different materials as the shielding plate, such as using a highly heat-insulating member to cut off the radiant heat from the heat generating members 101, 102, 103, so there is no need for material management costs for the shielding plates and design costs for using them separately. The total cost can be greatly reduced.

  As mentioned above, although the present Example was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the DVD unit 30 and the HDD unit 31 which are the heat generating parts 3 built in the housing 2 do not have to be prepared, either one may be provided, and the heat generating part 3 for raising the temperature inside the housing 2 is also acceptable. A microcomputer circuit unit in which an MPEG circuit block 32 or an IC (not shown) is implanted, or a power supply circuit unit 72 may be included. Further, as described above, it is possible to exhaust the heat in the housing 2 by taking in the air from the cooling fan 4 and changing the intake port 61 to the exhaust port. It only needs to be in a state where it can cool and reduce the interference noise between them, and the arrangement of the circuit board and HDD unit 31 in the housing 2 takes into consideration ease of use, compactness, and cost reduction. However, the present invention is not limited to the above-described embodiment and may be appropriately selected.

FIG. 4 is a schematic explanatory view showing a cooling air flow path formed by a cooling fan and a guide wall disposed in the recording / reproducing apparatus of the present invention. FIG. 3 is a block diagram illustrating a circuit configuration of a recording / reproducing device according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating the inside of the recording / reproducing apparatus according to the present invention. It is side sectional explanatory drawing which shows the cooling device of the conventional electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording / reproducing apparatus 2 Housing | casing 3 Heat generating part 4 Cooling fan 6 Cooling air 30 DVD unit 31 HDD unit 50 Tuner unit (electronic component)
51 Shield Plate 60 Discharge Port 71 Analog Circuit Block 72 Power Supply Circuit Unit 73 Analog Control Circuit Unit

Claims (3)

  A heating unit such as a DVD unit or an HDD unit disposed on one side of the housing, an analog circuit block disposed on the other side of the housing, and a cooling fan that exhausts heat released from the heating unit to the outside of the housing. In the recording / reproducing apparatus, the cooling fan is disposed at a discharge opening opened in the rear surface of the housing at a boundary between the heat generating portion and the analog circuit block, and a guide wall for guiding cooling air by the cooling fan is provided. A recording / reproducing apparatus provided with a cooling structure, wherein the recording / reproducing apparatus is provided at a boundary with the analog circuit block, and the guide wall is a tall electronic component constituting the recording / reproducing apparatus.   2. The recording / reproducing apparatus with a cooling structure according to claim 1, wherein the electronic component is a tuner unit surrounded by a metal shield plate. 3. The recording with a cooling structure according to claim 1, wherein the analog circuit block includes a power supply circuit unit and an analog control circuit unit, and the power supply circuit unit is disposed at a boundary between the heat generation unit and the analog circuit block. Playback device.

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