JP2009038144A - Shield case and electronic component unit - Google Patents

Abstract

The present invention is more efficient than the prior art and further enhances the cooling effect.
A shield case 301 is mounted on a substrate 11 on which a power supply circuit 12 and a signal processing circuit 13 made of electronic components are mounted, and covers the power supply circuit 12 and the signal processing circuit 13 inside thereof. By providing an air intake portion 320 including a plurality of left raised holes 321 formed by cutting and raising a part of the upper surface 301A outward so as to face the air flow on the upper surface 301A, the air flow The air can be taken into the shield case 301 through the air intake part 320 provided opposite to the power supply circuit 12 and the power supply circuit 12 and the signal processing circuit 13 can be cooled by the air.
[Selection] Figure 5

Description

  The present invention relates to a shield case and an electronic component unit, and is suitably applied to, for example, a shield case that covers an electronic component mounted on a substrate in a projector apparatus.

  Conventionally, in a shield case, the electronic component is mounted on the board on which the electronic component is mounted so as to cover the electronic component, and the electromagnetic wave radiated from the electronic component to the outside of the shield case, and from the outside of the shield case It is designed to shield electromagnetic waves radiated inward.

  For example, as shown in FIG. 1, the shield case 1 releases heat generated from an electronic component (not shown) provided on the inside thereof to the outside, so that the top surface 1A, the left side surface 1B, and the right side of the shield case 1 are disposed. A plurality of circular ventilation holes 2A, ventilation holes 2B (not shown), ventilation holes 2C, ventilation holes 2D and ventilation holes 2E (not shown) are provided on the surface 1C, the front surface 1D, and the rear surface 1E, respectively. Yes (see, for example, Patent Document 1).

  On the other hand, as shown in FIG. 2, in the conventional projector device 100, a fan 102, an electronic component unit 10, a light source (not shown), an optical system unit (not shown), and the like are provided inside a housing 101. Yes.

  The electronic component unit 10 has a configuration in which a power supply circuit 12 and a signal processing circuit 13 mounted on a substrate 11 are covered with a shield case 1. The projector device 100 is configured to operate the fan 102, the light source, the optical system unit, the signal processing circuit 13, and the like based on the power source power supplied from the power source circuit 12 of the electronic component unit 10.

  The projector device 100 displays an image based on the image signal generated by the signal processing circuit 13 on a liquid crystal panel (not shown) of the optical system unit, and transmits light emitted from the light source to the liquid crystal panel. Image light is obtained and the image light is projected onto a screen or the like.

  The projector device 100 is provided in the housing 101 so that the air inlet 103 and the air outlet 104 are opposed to each other, and air is taken into the housing 101 from the outside through the air inlet 103 by the fan 102. The taken-in air is exhausted from the exhaust port 104 to the outside.

  In the projector device 100, the power supply circuit 12 and the signal processing circuit 13 of the electronic component unit 10 are composed of a plurality of electronic components, and the electronic components need to be cooled in order to generate heat.

  Here, in the projector device 100, when the longitudinal surface of the substrate 11 is provided in parallel to the air flow, the upper surface 1A of the shield case 1 and the longitudinal surface of the substrate 11 are provided in parallel. Therefore, the upper surface 1A of the shield case 1 is also provided in parallel to the air flow.

  At this time, the shield case 1 takes air inward from a vent 2B on the left side 1B provided on the windward side facing the air flow, and absorbs heat generated from the power supply circuit 12 and the signal processing circuit 13 into the air. By doing so, the power supply circuit 12 and the signal processing circuit 13 are cooled.

Thereafter, the shield case 1 is configured to discharge the air heated by cooling the power supply circuit 12 and the signal processing circuit 13 from the vent hole 2C of the right side surface 1C provided on the leeward side.
JP2005-11864

  By the way, in the shield case 1 having such a configuration, since the upper surface 1A in the longitudinal direction is parallel to the flow of air taken in from the outside by the fan 102, air is almost taken inward from the vent hole 2A on the upper surface 1A. In other words, the power supply circuit 12 and the signal processing circuit 13 cannot be sufficiently cooled.

  The present invention has been made in consideration of the above points, and intends to propose a shield case and an electronic component unit that are more efficient and more effective in cooling than conventional ones.

  In order to solve such a problem, in the present invention, a shield case is mounted on a substrate on which an electronic component is mounted and covers the electronic component inside thereof, and at least one outer surface of the shield case faces the air flow. Thus, air intake means composed of a plurality of holes formed by cutting and raising a part of one surface to the outside is provided.

  Accordingly, the air can be efficiently taken into the shield case through the air intake means provided to face the air flow, and the electronic component can be effectively cooled by the air.

  Further, in the present invention, an electronic component unit comprising a board on which electronic components are mounted and a shield case that is mounted on the base and covers the electronic components inside, the air is placed on at least one outer surface of the shield case. Air intake means comprising a plurality of holes formed by cutting and raising a part of the one surface to the outside so as to face the flow is provided.

  Accordingly, the air can be efficiently taken into the shield case through the air intake means provided to face the air flow, and the electronic component can be effectively cooled by the air.

  According to the present invention, the air can be efficiently taken into the inside of the shield case via the air intake means provided to face the air flow, and the electronic components can be effectively cooled by the air. Therefore, it is possible to realize a shield case and an electronic component unit that are more efficient than the conventional case and further increase the cooling effect.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration of Projector In FIG. 3 in which the same reference numerals are assigned to the parts corresponding to those in FIG. 2, reference numeral 200 denotes a projector apparatus as a whole. The fan 102, the fan 202, and the like are provided, and an image projected from the projector device 200 via the projection lens 230 is displayed on the screen 600.

  FIG. 3 is a plan view showing the projector device 200, and defines the left-right direction with reference to the direction in which an image is projected from the projector device 200 onto the screen 600.

  The optical system unit 206 includes fly-eye lenses 211 and 212, a PS conversion element 213, a condenser lens 214, reflection mirrors 215, 218, 220 and 222, dichroic mirrors 216 and 217, relay lenses 219 and 221 and field lenses 223 and 225. 227, liquid crystal panels 224, 226 and 228, a cross dichroic prism 229, a projection lens 230, and the like.

  By the way, the projector device 200 is provided such that the air inlet 103 and the air inlet 203 and the air outlet 104 and the air outlet 204 are opposed to each other with respect to the casing 201, and the fan 202 passes through the air inlet 203. The light source 205 and the optical system unit 206 are mainly cooled by the air taken into the housing 201 from the outside, and the air heated by cooling the light source 205 and the optical system unit 206 is discharged from the exhaust port 204 to the outside. It is made to let you.

  Similarly, in the projector device 200, the power supply circuit 12 and the signal processing circuit 13 of the electronic component unit 310 are mainly cooled by the air taken into the housing 201 from the outside through the air inlet 103 by the fan 102, and the power supply circuit 12 and the signal processing circuit 13 are cooled, and the warmed air is discharged from the exhaust port 104 to the outside.

  On the other hand, in the optical system unit 206, the white light emitted from the light source 205 is transmitted through the fly-eye lens 211, the fly-eye lens 212, the PS conversion element 213, and the condensing lens 214, thereby making the luminance unevenness uniform and linearly polarized light. The white light converted into is incident on the dichroic mirror 216 via the reflection mirror 215.

  The dichroic mirror 216 transmits red light out of white light incident through the reflection mirror 215 and reflects blue light and green light. The dichroic mirror 216 transmits red light transmitted through the dichroic mirror 216. The light is condensed by the field lens 223 via the reflection mirror 218 and incident on the liquid crystal panel 224, and the blue light and green light reflected by the dichroic mirror 216 are incident on the dichroic mirror 217.

  The dichroic mirror 217 transmits blue light out of blue light and green light incident from the dichroic mirror 216 and reflects green light. The green light reflected by the dichroic mirror 217 is a field lens. The blue light transmitted through the dichroic mirror 217 is collected by the field lens 227 via the relay lens 219, the reflection mirror 220, the relay lens 221, and the reflection mirror 222. The light enters the liquid crystal panel 228.

  The liquid crystal panels 224, 226, and 228 are configured to display images corresponding to red, green, and blue, respectively, based on the video signal generated by the signal processing circuit 13 of the electronic component unit 310. Therefore, in the projector device 200, the red light, the green light, and the blue light collected by the field lenses 223, 225, and 227 are transmitted through the liquid crystal panels 224, 226, and 228, respectively, and then incident on the cross dichroic prism 229.

  The cross dichroic prism 229 combines red light, green light, and blue light incident from the liquid crystal panels 224, 226, and 228, and projects the combined video light onto the screen 600 by the projection lens 230.

  In this way, the projector device 200 can display an image based on the combined image light on the screen 600.

(2) Configuration of Electronic Component Unit (2-1) Overall Configuration of Electronic Component Unit As shown in FIGS. 3 and 4, the electronic component unit 310 includes a substrate 11, a power supply circuit 12 mounted on the substrate 11, and The signal processing circuit 13 and a shield case 301 (which will be described in detail later) are mounted on the substrate 11 and cover the power supply circuit 12 and the signal processing circuit 13. The electronic component unit 310 operates the light source 205, the optical system unit 206, the signal processing circuit 13, the fan 102, the fan 202, and the like based on the power supply power supplied from the power supply circuit 12.

(2-2) Configuration of Shield Case As shown in FIG. 5, the shield case 301 has a substantially rectangular parallelepiped shape with an opening at the bottom, and on the substrate 11 on which the power supply circuit 12 (FIG. 4) and the signal processing circuit 13 are mounted. Is attached.

  The shield case 301 is made of, for example, a conductive material such as aluminum, and electromagnetic waves radiated from the inner power supply circuit 12 and the signal processing circuit 13 to the outside of the shield case 301 and from the outside to the inside of the shield case 301. It is designed to shield radiated electromagnetic waves.

  In addition, the shield case 301 has a circular vent hole 302B (not shown), a vent hole 302C, a vent hole 302D, and a vent hole 302E (not shown) on the left side surface 301B, the right side surface 301C, the front surface 301D, and the back surface 301E. (Not shown) are provided, and the plurality of vent holes 302B to 302E are arranged in a staggered manner.

  The vent holes 302B to 302E of the shield case 301 are formed to have a diameter that does not allow electromagnetic waves to pass through. For example, the diameter of the vent holes 302B to 302E is set to 3 [mm].

  In addition, the shield case 301 is provided with an air intake portion 320 in a region on the windward half of the upper surface 301A, that is, a region on the left half. The air intake portion 320 is provided with a plurality of left cut-and-raised holes 321 (described later in detail) so as to face the air flow, and the plurality of left cut-and-raised holes 321 are arranged in a staggered manner. ing.

  Further, the shield case 301 is provided with an air discharge portion 330 for the leeward half region of the upper surface 301A, that is, the right half region. The air discharge portion 330 is provided with a plurality of right cut-and-raised holes 331 having the same shape as the left cut-and-raised holes 321 outward so as to turn away from the air flow. Arranged in a staggered pattern.

  The shield case 301 has the air intake part 320 and the air discharge part 330 arranged symmetrically with respect to the upper surface 301A. When the shield case 301 is attached on the substrate 11, the shield case 301 is attached in the opposite direction. Even in this case, the air intake part 320 can be replaced with the air exhaust part 330, and the air exhaust part 330 can be replaced with the air intake part 320. Has been made.

  Incidentally, although the shield case 301 has been described as having an integral structure, the lid portion including the upper surface 301A and the main body portion including the left side surface 301B, the right side surface 301C, the front surface 301D, and the back surface 301E are different. It may have a structure.

(2-3) Configuration of Left Cut-and-raised Hole As shown in FIGS. 6 (A) and 6 (B), the left cut-and-raised hole 321 of the air intake part 320 passes from the upper surface 301A of the shield case 301 through the root part 321C. A cut and raised piece 321A formed by cutting and raising in a horseshoe shape is provided outward so as to face the air flow.

  6A shows a plan view of the left cut-and-raised hole 321, and FIG. 6B shows a B-B ′ cross section of FIG. 6A.

  Further, the left cut-and-raised hole 321 has a vent hole 321B formed by providing the cut and raised piece 321A to the outside so as to face the air flow, and the vent hole 321B is formed from the outside to the inside of the shield case 301. The air is taken in through, or the air is discharged from the inside to the outside of the shield case 301.

  The left cut-and-raised hole 321 is formed to a size that does not allow electromagnetic waves to pass through the vent hole 321B. For example, the cut-and-raised piece 321A has a width of 3 [mm] and a length of 5 [mm]. Yes.

  Further, the cut-and-raised hole 321 has a cut-and-raised angle θ of the cut-and-raised piece 321A set to 30 ° to 45 ° with respect to the upper surface 301A of the shield case 301. Air can be efficiently taken inward through the raising piece 321A.

(2-4) Configuration of the right cut-and-raised hole Unlike the left cut-and-raised hole 321 of the air intake part 320, the right cut and raised hole 331 of the air discharge part 330 (FIG. 5) faces away from the air flow. Although it is provided on the outer side, the other parts have the same shape as the left cut-and-raised hole 321, and therefore the description thereof is omitted here.

(2-5) State of Air Flow As shown in FIG. 7 which is a cross section taken along the line AA ′ in FIG. 3, the projector device 200 takes air into the housing 3 by the fan 102 through the air inlet 103. The taken-in air is exhausted from the exhaust port 104.

  By the way, in the projector device 200, when the longitudinal surface of the substrate 11 is provided in parallel to the air flow, the upper surface 301A of the shield case 301 and the longitudinal surface of the substrate 11 are provided in parallel. Therefore, the upper surface 301A of the shield case 301 is also provided in parallel to the air flow.

  Therefore, the shield case 301 takes air inward through a vent hole 302B on the left side surface 301B provided on the windward side facing the air flow, and an air intake part provided in the left half region of the upper surface 301A. Since the air is taken in through 320, the air can be taken in more inward than in the prior art by the amount of air taken in through the air intake 320.

  The shield case 301 cools the power supply circuit 12 and the signal processing circuit 13 by absorbing the heat generated from the power supply circuit 12 and the signal processing circuit 13 into the air taken in from the air holes 302B and the air intake part 320. Has been made.

  After that, the shield case 301 provides air heated by cooling the power supply circuit 12 and the signal processing circuit 13 in the vent hole 302C of the right side surface 301C provided on the leeward side and the right half of the upper surface 301A. The air is discharged through the air discharge unit 330.

  Therefore, the shield case 301 is provided with the air intake part 320 and the air discharge part 330 on the upper surface 301A, so that the shield case 301 has a much larger amount than the conventional case by the amount of air taken in through the air intake part 320. Air can be taken inward, and the power supply circuit 12 and the signal processing circuit 13 can be effectively cooled by the taken-in air.

(3) Operation and Effect In the above configuration, the electronic component unit 310 includes the base 11, the power supply circuit 12 and the signal processing circuit 13 mounted on the base 11, and the shield case that covers the power supply circuit 12 and the signal processing circuit 13. 301.

  The shield case 301 is mounted on the substrate 11 on which the power supply circuit 12 and the signal processing circuit 13 are mounted so as to cover the power supply circuit 12 and the signal processing circuit 13, and includes a left side 301B, a right side 301C, and a front 301D. A plurality of ventilation holes 302B, a ventilation hole 302C, a ventilation hole 302D and a ventilation hole 302E on the back surface 301E, and an air intake part 320 including a plurality of left cut-and-raised holes 321 in the left half region of the upper surface 301A; An air discharge portion 330 including a plurality of right cut-and-raised holes 331 is provided in the right half region.

  Thus, when the upper surface 301A is attached in parallel to the air flow, the shield case 301 has a plurality of ventilation holes 302B provided on the left side surface 301B on the windward side facing the air flow and the upper surface 301A. Air can be taken inward through the air intake part 320 provided in the left half region, and the amount of air taken inward through the air intake part 320 is much more than conventional. Air can be taken in efficiently.

  Therefore, the shield case 301 has the power supply circuit 12 and the signal processing circuit 13 by the air taken in through the air holes 302B provided in the left side surface 301B and the air intake unit 320 provided in the left half region of the upper surface 301A. Can be cooled more efficiently and more effectively than in the past.

  The shield case 301 is made by bringing a heat conductive sheet such as silicon rubber and acrylic rubber mixed with a metal filler into contact with the power supply circuit 12 and the signal processing circuit 13 and the shield case 301, and from the power supply circuit 12 and the signal processing circuit 13. There is no need to adopt a structure in which the generated heat is released to the outside of the shield case 301 by heat conduction, and the power supply circuit has a simple structure in which the air intake part 320 and the air discharge part 330 are simply provided on the upper surface 301A. 12 and the signal processing circuit 13 can be effectively cooled.

  The shield case 301 has an air intake part 320 and an air discharge part 330 arranged symmetrically on the upper surface 301A of the shield case 301. Even when the shield case 301 is attached on the substrate 11 in the opposite direction, By replacing the air intake part 320 with the air exhaust part 330 and substituting the air exhaust part 330 with the air intake part 320, it is possible to have the same function as that when correctly installed.

  Furthermore, the shield case 301 has a plurality of left cut-and-raised holes 321 provided in the air intake portion 320, which are arranged in a staggered manner. The cut-and-raised piece 321A of the 321 does not interfere with the air intake operation with respect to the cut-and-raised piece 321A of the leeward left-side raised hole 321. Since air can be taken in from both sides, air can be taken in efficiently inside the shield case 301.

  According to the above configuration, the shield case 301 has an air intake portion 320 including a plurality of left cut-and-raised holes 321 in the left half region and a plurality of right cut and raised holes in the right half region with respect to the upper surface 301A. By providing the air exhaust portion 330 made of 331, the cooling effect can be improved more efficiently and more efficiently than the conventional one.

(4) Other Embodiments In the above-described embodiment, the shield case 301 includes a plurality of vent holes 302B, 302C, 302D on the left side surface 301B, right side surface 301C, front surface 301D, and back surface 301E. Ventilation hole 302E, air intake portion 320 disposed in the left half region of upper surface 301A so as to face the air flow, and air disposed in the right half region of upper surface 301A so as to turn away from the air flow Although the case where the discharge portion 330 is provided has been described, the present invention is not limited to this, and a plurality of passages are respectively provided on the left side surface 401B, the right side surface 401C, the front surface 401D, and the back surface 401E of the shield case 401 as shown in FIG. Air holes 402B (not shown), air holes 402C, air holes 402D and air holes 402E (not shown), and upper surface 402A An air intake portion 420 including a plurality of cut-and-raised holes 421 may be provided on the entire surface so as to face the air flow.

  In the above-described embodiment, the shield case 301 includes a plurality of ventilation holes 302B, a ventilation hole 302C, a ventilation hole 302D, a ventilation hole 302E, and a top surface 301A on the left side surface 301B, the right side surface 301C, the front surface 301D, and the back surface 301E. An air intake part 320 arranged to face the air flow in the left half area and an air discharge part 330 arranged to face the air flow in the right half area of the upper surface 301A were provided. Although the present invention is not limited to this, as shown in FIG. 9, the flow of air faces the front surface 501D, and the air flows from the front surface 501D side to the back surface 501E side along the longitudinal direction of the upper surface 501A. When flowing, a plurality of air holes 502A are provided on the upper surface 501A, front surface 501D, and rear surface 501E of the shield case 501, respectively. The air intake portion 520B is composed of a plurality of front raised holes 521B (not shown) facing the air flow in the front half portions of the left side 501B and the right side 501C. (Not shown) and an air intake portion 520C composed of a plurality of front cut-and-raised holes 521C, and a plurality of rearward outwards so as to turn the back of the air flow toward the rear half of the left side 501B and the right side 501C. An air discharge part 530B (not shown) made of side cut-and-raised holes 531B (not shown) and an air discharge part 530C made of a plurality of rear cut-and-raised holes 531C may be provided.

  Further, in the above-described embodiment, the case where the left cut-and-raised hole 321 and the right cut-and-raised hole 331 are formed in a horseshoe shape is described, but the present invention is not limited to this, and the left cut-and-raised hole 321 and the right cut-and-raised hole are provided. 331 may be formed in various other shapes such as a quadrangle and a triangle.

  Further, in the above-described embodiment, the case where the width of the cut and raised piece 321A of the left cut and raised hole 321 is set to 3 [mm] and the width is set to 5 [mm] is described, but the present invention is not limited to this. Any size can be used as long as it does not allow electromagnetic waves to pass through.

  Further, in the above-described embodiment, the case where the cut and raised angle θ of the cut and raised piece 321A is set to 30 ° to 45 ° with respect to the upper surface 301A of the shield case 301 is described, but the present invention is not limited to this. The cut-and-raised angle θ of the cut-and-raised piece 321A is set to the outside with respect to the upper surface 301A of the shield case 301, and the angle may be any number as long as it is within 90 °.

  Further, in the above-described embodiment, the case where the air holes 302B to 302E, the left cut-and-raised hole 321 and the right cut-and-raised hole 331 provided in the shield case 301 are arranged in a staggered manner has been described. Not limited to this, the vent holes 302B to 302E, the left cut-and-raised hole 321 and the right cut-and-raised hole 331 provided in the shield case 301 may be arranged in various other arrangements such as a square arrangement and a random arrangement.

  Furthermore, in the embodiment described above, when the left side surface 301B, the right side surface 301C, the front surface 301D, and the back surface 301E of the shield case 301 are provided with a plurality of air holes 302B, air holes 302C, air holes 302D, and air holes 302E, respectively. However, the present invention is not limited to this, and a plurality of slits may be provided on the left side surface 301B, the right side surface 301C, the front surface 301D, and the back surface 301E of the shield case 301, respectively.

  Further, in the above-described embodiment, the case where the shield case of the present invention is configured by the air intake unit 320 as the air intake means has been described. However, the present invention is not limited to this, and the air intake having various other configurations. You may make it comprise a shield case by an insertion means.

  The shield case and the electronic component unit of the present invention can be applied to, for example, a shield case and an electronic component unit that cover various other electronic components such as a television receiver and a notebook personal computer other than the projector device.

It is a basic diagram which shows the structure of the conventional shield case. It is a basic diagram which shows the structure of the conventional projector apparatus. It is a basic diagram which shows the structure of a projector apparatus. It is a basic diagram which shows the structure of an electronic component unit. It is a basic diagram which shows the structure of a shield case. It is a basic diagram which shows the structure of a left side raising hole. It is a basic diagram which shows the mode (A-A 'cross section) of the flow of air. It is an approximate line figure showing composition (1) of a shield case in other embodiments. It is an approximate line figure showing composition (2) of a shield case in other embodiments.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,301 ... Shield case, 2A-2E, 302B-302E ...... Vent hole, 10,310 ... Electronic component unit, 11 ... Substrate, 12 ... Power supply circuit, 13 ... Signal processing circuit, 100,200 ... Projector device, 101, 201 ... Case, 102, 202 ... Fan, 103, 203 ... Intake port, 104,204 ... Intake port, 205 ... Light source, 206 ... Optical unit, 320 ... ... Air intake part, 321 ... Left side cut and raised hole, 321A ... Cut and raise piece, 321B ... Vent hole, 321C ... Root part, 330 ... Air discharge part, 331 ... Right side cut and raised hole, 600 ... …screen.

Claims (5)

A shield case that is mounted on a substrate on which electronic components are mounted and covers the electronic components inside thereof,
An air intake means comprising a plurality of holes formed by cutting and raising a part of the one surface to the outside so as to face the air flow on at least one outer surface of the shield case. Case. The shield case is
Air discharge means comprising a plurality of holes formed by cutting and raising a part of the one surface to the outside so as to face the air flow on the surface on which the air intake means is disposed;
The shield case according to claim 1, wherein the air intake means is disposed on the leeward side with respect to an air flow, and the air discharge means is disposed on the leeward side. The shield case according to claim 2, wherein the air intake means is arranged symmetrically with the air discharge means. The shield case according to claim 3, wherein the air intake means and the air discharge means have the plurality of holes arranged in a staggered manner. An electronic component unit comprising a substrate on which electronic components are mounted and a shield case that is mounted on the base and covers the electronic components on the inside thereof,
An electronic device comprising an air intake means comprising a plurality of holes formed by cutting and raising a part of the one surface to the outside so as to face an air flow on at least one outer surface of the shield case. Parts unit.

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