JP2007171392A - Projection type display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display apparatus having a power source block that ensures satisfactory cooling efficiency. <P>SOLUTION: The power source block 22 of the projection type display apparatus includes: a circuit board 42 on which an electric element is disposed from one end to the other end thereof; a duct cover 34 having a shape matching the shape of the circuit board so as to cover the circuit board; a suction fan 36 disposed in the duct cover and used to cool the circuit board; and an exhaust section 40 disposed in the duct cover and used to exhaust air sent by the suction fan. The duct cover has opening 72 on one side of the circuit board and an opening 74 on the other side thereof. The openings are formed so as to turn aside from the position where they face each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection display device for projecting an image on a screen or the like.

  Patent Document 1 discloses a cooling device for electronic equipment. This exhausts the air in the device from the exhaust port through the duct from the exhaust fan.

Patent Document 2 discloses a cooling device for an electronic device in which a heat generating component is disposed on the bottom surface. In this method, air is introduced from the vent and brought into contact with the heat-generating component, and then the air is exhausted from the exhaust.
JP 2001-147061 A JP 2000-277957 A

  The cooling device disclosed in Patent Document 1 merely exhausts air in an electronic device. For this reason, the electric element in an electronic device cannot be cooled directly.

  Moreover, the cooling device disclosed in Patent Document 2 simply dissipates heat by combining the heat of the heat-generating component with the heat dissipation plate. However, since the vent is located in the center of the bottom and the exhaust is located close to the heat-generating component, it was introduced from the vent when other components were present at the end of the bottom. There is a risk that the gas will be exhausted before it reaches the end parts.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a projection display device having a power supply block with good cooling efficiency for a member that generates heat.

In order to solve the above-described problems, a projection display device according to the present invention includes a power supply block and a device for projecting an image upon receiving power from the power supply block. The power supply block includes an AC input terminal, a converter that converts AC power input from the AC input terminal into DC power, and a DC output terminal that outputs DC power converted by the converter. A circuit board disposed toward the other end of the circuit board, and formed in accordance with the shape of the circuit board so as to cover the circuit board, and close to one side and the other side adjacent to the one end and the other end of the circuit board, respectively A duct cover having an opening at each position, an intake fan disposed on the duct cover for cooling the circuit board, and an air disposed on the duct cover and supplied by the intake fan. And an exhaust part for exhausting, wherein the opening of the duct cover is formed at a position deviating from a position facing each other.
By blowing air with the intake fan, it is possible to efficiently cool a converter having a rectifying element, a coil and the like that generate heat. In addition, since the opening is formed at a position away from the position facing each other, after the air sent from the intake fan of one opening is spread from one end of the circuit board to every corner of the other end, Can be exhausted. Therefore, the converter having the electric element disposed on the circuit board can be efficiently cooled.

  According to the present invention, it is possible to provide a projection display device having a power supply block with good cooling efficiency for a member that generates heat.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Here, an embodiment of a video projector apparatus (projection display apparatus) will be described with reference to FIGS.
A video projector apparatus 10 shown in FIG. 1 is arranged in a substantially rectangular parallelepiped housing 12 in a state where various devices are unitized or blocked. The housing 12 includes a bottom cover 14 and a top cover 16. As shown in FIG. 2, the bottom cover 14 is erected from a base portion 14a formed in a substantially rectangular shape and an edge portion of the base portion 14a, and the top cover 16 is detachably mounted by engagement or the like. And an installation portion 14b. A plurality of fans such as first and second intake fans 36 and 38, which will be described later, and an exhaust fan are arranged at predetermined positions on the standing portion 14b.

  As shown in FIG. 2, the base 14a of the bottom cover 14 is provided with a device (optical system) necessary for projecting an image on a screen (not shown) or the like at a predetermined position. A power supply block 22 is disposed on the front side of the bottom cover 14 in FIG. A light source unit 24 capable of outputting white light is disposed substantially at the center and slightly left of the bottom cover 14. A color filter 26 is disposed adjacent to the light source unit 24. An image generating device 28 is disposed adjacent to the color filter 26. A projection optical system 30 is disposed adjacent to the image generation device 28. The optical system such as the image generation device 28 and the projection optical system 30 is operated by the power supplied from the power supply block 22. Therefore, the light emitted from the light source unit 24 forms image information by the image generation device 28 through the color filter 26, and an image is output from the projection optical system 30 to the outside. That is, an image is projected on a screen or the like. Although not shown, in addition to such an optical system, members and units that perform a screen function, a control function, an acoustic function, a cooling function, and the like are incorporated in the bottom cover 14.

As shown in FIGS. 3 and 4, the power supply block 22 includes a power supply unit 32, a duct cover 34, first and second intake fans (air supply fans) 36 and 38, and an exhaust port 40. Yes.
As shown in FIGS. 5A to 5C, the power supply unit 32 includes a substantially rectangular circuit board 42. On the circuit board 42, an AC input terminal 44, a converter 46 for converting AC to DC, and a DC output terminal 48 are arranged in this order from one end 42a to the other end 42b.

  An AC voltage is input to the AC input terminal 44. The converter 46 includes an AC power supply rectification unit (bridge rectifier) 52, a coil 54, and a smoothing circuit 56. The AC power supply rectification unit 52 includes a rectifying element 52a that extracts a DC voltage from an AC voltage input to the AC input terminal 44, such as a bridge diode. The rectifying element 52a of the AC power supply rectifying unit 52 generates heat. For this reason, this rectifier element 52a is fixed to a heat radiating plate 52b for releasing heat. The heat radiating plate 52 b is formed in a substantially flat plate shape standing on the circuit board 42. For example, a metal material having a high thermal conductivity such as aluminum is used for the heat radiating plate 52b.

  The DC voltage output from the rectifying element 52 a reduces the AC component in the output of the DC power supply by the inductance of the coil 54 and supplies the DC power to the smoothing circuit 56. At this time, the coil 54 generates heat when a current flows.

  The smoothing circuit 56 further reduces the AC component in the output of the DC power supply. Then, the electric power is supplied to the DC output terminal 48. For this reason, DC power is supplied from the output terminal 48 to, for example, the image generating device 28 and the like. In particular, some of the electric elements 56 a of the smoothing circuit 56 are fixed to the lower side of the circuit board 42. For this reason, the space of the circuit board 42 can be used effectively and the circuit board 42 is used on both the front surface and the back surface, so that the circuit board 42 itself can be formed small. The electric element 56a of the smoothing circuit 56 and other electric elements also generate heat when a current flows, like the rectifying element 52a and the coil 54.

  Further, a heat radiating plate 60 is fixed to the circuit board 42 in parallel with a predetermined distance C on the lower side thereof. The heat radiating plate 60 is formed in a substantially rectangular flat plate shape, and is connected to the circuit board 42 by a leg portion 60a. The heat radiating plate 60 is made of, for example, a metal material having high thermal conductivity such as aluminum. An insulating sheet 62 having high thermal conductivity, such as a high thermal conductive insulating sheet, is fixed to the upper surface of the heat radiating plate 60. That is, the insulating sheet 62 having high thermal conductivity is disposed so as to transfer heat in the vicinity of or in contact with the electric element 56a disposed on the back surface of the circuit board 42.

  The duct cover 34 shown in FIGS. 3 and 4 is formed so as to substantially seal the circuit board 42. The duct cover 34 is detachably fixed to the base portion 14a of the bottom cover 14 by, for example, fitting or screw fastening. Here, the circuit board 42 is formed in a substantially rectangular shape, various electric elements are disposed on the circuit board 42, and the heat radiating plate 60 is fixed in parallel to the circuit board 42. For this reason, this duct cover 34 is formed in a substantially rectangular parallelepiped shape. The duct cover 34 generally includes one end surface 34a close to one end 42a (see FIG. 5C) of the circuit board 42, the other end face 34b close to the other end 42b of the circuit board 42, and a circuit board. 42, one side surface 34c adjacent to one side 42c, the other side surface 34d adjacent to the other side 42d of the circuit board 42, an upper surface 34e covering the one end surface 34a, the other end surface 34b, the one side surface 34c and the other side surface 34d. It is formed by. The duct cover 34 is preferably formed of a metal material such as aluminum having high thermal conductivity.

  As shown in FIG. 3, a first opening 72 is formed in the duct cover 34 at a position close to one side 42 c of one end 42 a of the circuit board 42. That is, a first opening 72 is formed on one side surface 34 c adjacent to the one end surface 34 a of the duct cover 34. The first opening 72 is formed at a position close to the standing portion 14 b of the bottom cover 14. A first intake fan 36 is disposed in the first opening 72. For this reason, fresh outside air can be sucked into the duct cover 34 from the first intake fan 36.

  At this time, as shown in FIG. 5B, the first intake fan 36 is disposed at a position where air is directly supplied to the rectifying element 52a and the coil 54. That is, the first fan 36 is disposed at a position where the blade portion of the first intake fan 36 faces the rectifying element 52 a and the coil 54. For this reason, the rectifier element 52a and the coil 54 can be efficiently cooled.

  As shown in FIG. 4, the duct cover 34 is further formed with a second opening 74 at a position close to the other side 42 d of the other end 42 b of the circuit board 42. That is, a second opening 74 is formed on the other side surface 34 d adjacent to the other end surface 34 b of the duct cover 34. The second opening 74 is provided with an exhaust port 40. For this reason, the air taken in by the first intake fan 36 can be discharged to the outside of the duct cover 34.

  As shown in FIGS. 3 and 4, the duct cover 34 is further formed with a through hole 76 at a position close to the one side 42 c of the other end 42 b of the circuit board 42. That is, a through hole 76 is formed in one side surface 34 c adjacent to the other end surface 34 b of the duct cover 34. The through hole 76 is formed at a position close to the standing portion 14 b of the bottom cover 14. A second intake fan 38 is disposed in the through hole 76. Therefore, fresh outside air can be sucked into the duct cover 34 from the second intake fan 38.

At this time, the second intake fan 38 is disposed at a position where air is directly supplied to the electric elements of the smoothing circuit 56. That is, the second intake fan 38 is disposed at a position where the blade portion of the second intake fan 38 faces the electric element of the smoothing circuit 56. In other words, the position of the through hole 76 is suitable in any of the position facing the second opening 74 and the position deviating from the position facing the second opening 74. For this reason, the electric element of the smoothing circuit 56 can be cooled efficiently.
The driving power for the first and second intake fans 36 and 38 is supplied from the power supply unit 32.

Next, the operation of the video projector device 10 according to this embodiment will be described.
By turning on a switch (not shown) of the video projector device 10, AC power is input to the AC input terminal 44 of the power supply unit 32. The alternating current is converted into direct current by the rectifying element 52a. When a direct current flows from the rectifying element 52a to the coil 54, the alternating current component is removed. Further, the current passing through the coil 54 flows through the smoothing circuit 56, whereby the AC component is further removed. Thus, the AC power input to the AC input terminal 44 is converted into DC power by the converter 46, and DC power is output from the DC output terminal 48.

  Then, the first and second intake fans 36 and 38 are rotated by the DC power. Then, the air is sucked into the power supply unit 32 in the duct cover 34 by the rotation of the first and second fans 38. That is, the air is blown toward the power supply unit 32.

  At this time, the coil 54 and the rectifying element 52a disposed at positions facing the blades of the first fan 36 generate heat, but continue to be cooled by the air blown from the first fan 36. That is, the coil 54 is directly cooled by the air blown from the first fan 36. Further, in the rectifying element 52a, both the rectifying element 52a and the heat radiating plate 52b are cooled by blowing air. At this time, the heat generated from the rectifying element 52a is directly cooled by the air sent from the first fan 36, and after a part of the heat is transferred to the heat radiating plate 52b, the heat is continuously cooled by the air sent to the heat radiating plate 52b.

  In particular, since the air blown to the coil 54 and the rectifying element 52a takes in the outside air as it is, the cooling efficiency is the highest, and the coil 54 and the rectifying element 52a can be efficiently cooled.

  The air from the first intake fan 36 partially cools the coil 54 and the rectifying element 52 a, but most of the light is reflected by the inner wall of the other side surface 34 d of the duct cover 34 that faces the first intake fan 36. To do. At this time, since the air is continuously blown from the first intake fan 36, the air reflected on the inner wall of the other side surface 34d of the duct cover 34 flows toward the other end 42b of the circuit board 42. Therefore, it flows toward the other end 42 b of the circuit board 42 while cooling the smoothing circuit 56 of the converter 46.

  Further, the first intake fan 36 blows air also into the space C between the circuit board 42 and the heat radiating plate 60 arranged in parallel to the circuit board 42. The blown air at this time is reflected by the inner wall of the duct cover 34 facing the first intake fan 36. At this time, since the air is continuously blown from the first intake fan 36, the air reflected on the inner wall of the other side surface 34d of the duct cover 34 flows toward the other end 42b of the circuit board 42. Therefore, the electric element 56 a mounted on the lower side of the circuit board 42 is also exposed to the air blown by the first intake fan 36. For this reason, the electric element 56a on the lower side of the circuit board 42 is also cooled.

  The air sent from the first intake fan 36 is reflected on the inner wall of the other end surface 34 b of the duct cover 34. At this time, since the air is continuously blown from the first intake fan 36, the air reflected on the inner wall of the other end surface 34 b of the duct cover 34 is discharged (exhausted) from the exhaust port 40 of the second opening 74.

  Further, a smoothing circuit 56 is disposed at a position facing the blades of the second intake fan 38. For this reason, the electric element of the smoothing circuit 56 that generates heat continues to be cooled by the air blown from the second fan 38. That is, the smoothing circuit 56 is directly cooled by the air blown from the second fan 38. In particular, since the blown air takes in the outside air as it is, it has the highest cooling capacity, and the electric elements of the smoothing circuit 56 can be efficiently cooled.

  Then, the air from the second intake fan 38 partially cools the electric elements of the smoothing circuit 56, but most of the light is reflected by the inner wall of the other side surface 34 d of the duct cover 34 facing the second intake fan 38. To do. However, since the first intake fan 36 continues to send air, the air from the second intake fan 38 is mixed with the air from the first intake fan 36 so that the other end face 34b of the duct cover 34 is It flows toward the inner wall. Therefore, the air from the second fan 38 flows toward the other end 42 b of the circuit board 42 while cooling the smoothing circuit 56 of the converter 46 while being mixed with the air from the first fan 36.

  The air blown from the second air intake fan 38 mixed with the air blown from the first air intake fan 36 is reflected on the inner wall of the other end surface 34 b of the duct cover 34. At this time, since the air is continuously blown from the first and second intake fans 36 and 38, the air reflected on the inner wall of the other end surface 34 b of the duct cover 34 is discharged from the exhaust port 40 of the second opening 74 ( Exhausted). Therefore, the air from the first intake fan 36 is cooled by being mixed with the air from the second intake fan 38 and then discharged.

As described above, according to this embodiment, the following effects can be obtained.
By directly blowing the outside air by the first intake fan 36, it is possible to efficiently cool the rectifying element 52a and the coil 54 that generate particularly heat. The first opening 72 is disposed on one side surface 34 c adjacent to the one end surface 34 a of the duct cover 34, and the second opening 74 is disposed on the other side surface 34 d adjacent to the other end surface 34 b of the duct cover 34. For this reason, the air sent from the first intake fan 36 of the first opening 72 can be exhausted in a state of being spread from one end of the circuit board 42 to every corner of the other end. That is, the cooling gas reaches every corner in the duct cover 34. Therefore, various elements disposed on the circuit board 42 can be efficiently cooled.

  Furthermore, the cooling capacity can be improved by arranging the second intake fan 38 in the second opening 74 as an auxiliary. Further, by using the second intake fan 38 together with the first intake fan 36, the temperature exhausted from the exhaust port 40 can be lowered as compared with the case where only the first intake fan 36 is used. Therefore, members other than the power supply block 22 can be disposed closer to the exhaust port 40 than when only the first intake fan 36 is used. Then, the video projector device 10 can be reduced in size.

  A heat radiating plate 60 is arranged in parallel with the circuit board 42. For this reason, the heat radiating plate 60 can radiate the heat while absorbing the heat generated from the heating element. Therefore, since heat generation can be dispersed, it is possible to prevent heat from being applied to the elements of the circuit board 42. Further, since the electric elements are respectively disposed on the upper surface and the lower surface of the circuit board 42, the area required for the circuit board 42 can be reduced as compared with the case where only one surface of the circuit board 42 is used.

  In this embodiment, two intake fans 36 and 38 have been described at the position of one side surface 34c close to the one end surface 34a and the other end surface 34b of the duct cover 34. However, since the air flow can be generated from one end 42a to the other end 42b of the circuit board 42 as long as it is arranged only at a position close to the one end face 34a, it is arranged on the circuit board 42. Various elements can be cooled. In other words, the intake fan 36 is disposed on one side surface 34 c close to the one end surface 34 a of the duct cover 34, and from the exhaust port 40 disposed on the other side surface 34 d close to the other end surface 34 b of the duct cover 34. Gas (air) escapes. For this reason, various elements on the circuit board 42 in which gas flows from the one end 42a to the other end 42b of the circuit board 42 as a whole are efficiently cooled. At this time, the air is directly supplied from the intake fan 36 to the rectifying unit 52 and the coil 54 that generate heat. For this reason, the site | part which wants to cool especially can be cooled reliably. That is, the second intake fan 38 in this embodiment can be used supplementarily to improve the cooling efficiency of various elements disposed on the circuit board 42.

  Further, in this embodiment, it has been described that the exhaust port 40 is opened so as to allow fluid to flow outside, but an exhaust fan (not shown) is provided in the through hole 76 instead of the exhaust port 40. It is also suitable that it is provided. The driving power for the exhaust fan is supplied from the power supply unit 32.

  In this embodiment, the first fan 36 is disposed in the first opening 72 close to the standing portion 14 b of the bottom cover 14. However, the first opening 36 is disposed in the second opening 74. It is also preferable to arrange the fan 36 and arrange the exhaust port 40 in the first opening 72. This is particularly suitable when the second opening 74 is also formed at a position close to the standing portion 14 b of the bottom cover 14.

  The embodiment has been specifically described so far with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and all the embodiments performed without departing from the scope of the invention are described. Including.

1 is a schematic perspective view showing a video projector apparatus according to an embodiment of the present invention. 1 is a schematic perspective view showing a state in which a device for projecting an image is arranged on a bottom cover of a video projector device according to an embodiment. FIG. The schematic perspective view which shows the state which observed the state which removed the duct cover in the state which has arrange | positioned the power supply unit to the bottom cover, and the video projector apparatus which concerns on one Embodiment from the outer side of the bottom cover. The schematic perspective view which shows the state which observed the state which removed the duct cover in the state which has arrange | positioned the power supply unit to the bottom cover, and the video projector apparatus which concerns on one Embodiment from the inner side of the bottom cover. 1 shows a power supply unit of a power supply block arranged in a video projector according to an embodiment, wherein (A) is a schematic perspective view of the circuit board as viewed from one end and one side of the circuit board, and (B) is a circuit. The schematic top view of the state observed from the one side of the board | substrate, (C) is a schematic top view of the state observed from the upper direction of the circuit board.

Explanation of symbols

  C: Interval, 14 ... Bottom cover, 14a ... Base, 14b ... Standing part, 22 ... Power supply block, 32 ... Power supply unit, 34 ... Duct cover, 34a ... One end face, 34b ... Other end face, 34c ... One side face, 34d ... other side surface, 34e ... upper surface, 36 ... first intake fan, 38 ... second intake fan, 40 ... exhaust port, 42 ... circuit board, 42a ... one end, 42b ... other end, 42c ... one side, 42d ... Other side, 44 ... AC input terminal, 46 ... converter, 48 ... DC output terminal, 52 ... AC power supply rectification unit, 52a ... rectifier element, 52b ... heat sink, 54 ... coil, 56 ... smoothing circuit, 60 ... heat sink 60a ... Legs, 62 ... Insulating sheet, 72 ... First opening, 74 ... Second opening, 76 ... Through-hole

Claims (7)

A projection display device having a power supply block and a device for projecting an image by receiving power from the power supply block,
The power block is
An AC input terminal, a converter that converts AC power input from the AC input terminal into DC power, and a DC output terminal that outputs DC power converted by the converter are arranged from one end to the other. A circuit board,
A duct cover that is formed in accordance with the shape of the circuit board so as to cover the circuit board, and has openings at positions adjacent to one side and the other side respectively adjacent to one end and the other end of the circuit board;
An intake fan disposed on the duct cover for cooling the circuit board;
An exhaust part that is disposed on the duct cover and exhausts air sent by the intake fan;
The projection display device, wherein the opening of the duct cover is formed at a position deviating from a position facing each other. The duct cover is
One side of the opening is formed on one side surface that is close to one end of the circuit board and faces one side of the circuit board, and close to the other end of the circuit board and on the other side of the circuit board. The other side of the opening is formed on the opposite side surface,
When the intake fan is arranged in one of the openings, the exhaust part is arranged in the other of the openings,
The projection display device according to claim 1, wherein when the exhaust unit is disposed in one of the openings, the intake fan is disposed in the other of the openings. One of the openings is formed at a position close to a heat generating member of the converter,
The projection display device according to claim 1, wherein the intake fan is disposed in the opening. The duct cover further includes a ventilation hole on the same side surface as the opening in which the intake fan is disposed in the opening.
The projection display device according to any one of claims 1 to 3, wherein another air intake fan is disposed in the ventilation hole.   The projection display device according to claim 4, wherein the ventilation hole is formed to face the opening in which the exhaust part is disposed in the opening.   5. The projection display device according to claim 4, wherein the ventilation hole is formed at a position out of a position facing the opening in which the exhaust part is disposed in the opening. The circuit board includes a plate-like member that is arranged at an arbitrary distance from the circuit board and has a heat transfer action.
7. The plate member according to claim 1, wherein at least some of the electric elements of the converter arranged on the circuit board are arranged in proximity to or in contact with each other. The projection display device according to any one of the above.

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