CN1641476A - Radiating module - Google Patents
Radiating module Download PDFInfo
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- CN1641476A CN1641476A CN 200410000503 CN200410000503A CN1641476A CN 1641476 A CN1641476 A CN 1641476A CN 200410000503 CN200410000503 CN 200410000503 CN 200410000503 A CN200410000503 A CN 200410000503A CN 1641476 A CN1641476 A CN 1641476A
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- heat radiation
- fan
- radiation module
- framework
- projector
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Abstract
This invention is about a kind of cooling module group suitable to be used in carrying the electrical source circuit board and the startup circuit board of a projection apparatus and cooling them. The cooling module group comprises a frame body, a fan assembling flute, a fan and a flexible fastener. The frame body has a wind-in and wind-out orifice. Thereinto the electrical source circuit board and the startup circuit board of a projection apparatus are fixed in the frame body. There forms a wind path between the wind-in and the wind-out orifice. Besides the fan assembling flute is connected to the wind-out of the frame body. The arrangement of the flexible fastener and the fan assembling flute can rapidly fix the fan in the fan assembling flute, so it can reduce the cost of assembling the cooling module group.
Description
Technical field
The present invention relates to a kind of heat radiation module (heat dissipation module), particularly relate to and a kind ofly utilize the collocation of a spring secures rail to sleeper and a fan assembling grove apace fan is fixed in the heat radiation module in the fan assembling grove.
Background technology
In modern society, the use that the projection display is a large amount of is no matter be bulletin report etc. on the classroom of school or in company.Overheated for the electronic package on the circuit board that prevents projection display inside, and cause circuit board that temporary or nonvolatil inefficacy takes place, therefore must provide good heat dissipation design, to guarantee the normal operation of projection display intraware.Heat radiation with circuit board is an example, in order to reduce the heat energy that circuit board is produced effectively when the projection display operates, usually the side at most circuit boards installs a radiator fan respectively additional, respectively circuit board is dispelled the heat by the arrange in pairs or groups mode of a radiator fan of a circuit board, make the projection display can keep normal operation.
Seeing also shown in Figure 1A, is the exploded perspective synoptic diagram that has known a kind of module that dispels the heat now.Existing known heat radiation module 101, normally be equipped on the casing (not shown) of projection display (not shown), it mainly comprises a fan 110, a fan assembling grove 120, wherein fan 110 has most pilot holes 112, and fan assembling grove 120 has most assembly holes 122, fan 110, fan assembling grove 120 then are to join with most screws 2 and pilot hole 112, assembly hole 122 towers on it, and fan 110 is locked in the fan assembling grove 120.
Seeing also shown in Figure 1B, is existing known a kind of synoptic diagram that projector's power supply circuit board and projector's start-up circuit plate is dispelled the heat with fan.Heat radiation module 101,102 dispels the heat to projector's power supply circuit board 10 and projector's start-up circuit plate 20 respectively.By among Figure 1B as can be known, projector's power supply circuit board 10 and projector's start-up circuit plate 20 normally are equipped on the casing (not shown) of projection display (not shown), projector's power supply circuit board 10 and projector's start-up circuit plate 20 then are with most screws 4, copper post (not shown) and 12,22 collocation of the screw on it, are locked in respectively on the casing of the projection display.
It should be noted that, in the prior art, the assembler must can be locked in fan 110 in the fan assembling grove 120 with screw 2 by a hand tool, in the process of locking, might cause the torsional deformation of fan 110 and fan assembling grove 120 or split, and then cause defective products, and the assembling between fan 110 and the fan assembling grove 120 will expend and assemble man-hour, and the blower module 101 finished of assembling prevent the weak effect that shakes, cause noise to reduce.
In addition, projector's power supply circuit board 10 and projector's start-up circuit plate 20 must be arranged in pairs or groups heat radiation module 101,102 respectively to carry out other heat radiation, can reach the radiating effect of expection.Therefore, the fabricator of the projection display must decide number of fans according to required number of circuit boards, make the fan aspect cost and can't effectively reduce the man-hour in the assembling.
In addition; the assembler must can be locked in projector's power supply circuit board 10 and projector's start-up circuit plate 20 on the casing of the projection display by a hand tool with screw 50; in the process of locking; regular meeting causes projector's power supply circuit board 10 and projector's start-up circuit plate 20 torsional deformations or splits, and then causes defective products.In addition, the assembling between projector's power supply circuit board 10 and projector's start-up circuit plate 20 and the casing not only expends assembling man-hour and the danger that will get an electric shock easily of assembler.
This shows that above-mentioned existing heat radiation module still has many defectives, and demands urgently further being improved.In order to solve the problem that the heat radiation module exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing heat radiation module exists, the inventor is actively studied innovation, in the hope of founding a kind of novel heat radiation module based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, can improve existing heat radiation module, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing heat radiation module exists, and provide a kind of heat radiation module of new structure, technical matters to be solved is to make it have a fan assembling grove and a spring secures rail to sleeper, the assembler can be equipped on fan in the fan assembling grove on hand tool ground, thereby be suitable for practicality more, and have the value on the industry.
Another object of the present invention is to, a kind of heat radiation module is provided, technical matters to be solved is to make it have the framework of most group conduits or rib, and the assembler can be equipped on a majority circuit board in the framework on hand tool ground, thereby is suitable for practicality more.
A further object of the present invention is, a kind of heat radiation module is provided, technical matters to be solved is to make it have framework and only use a fan to be equipped on an air outlet of this framework, just can be disposed at the suitable heat radiation of circuit board in the framework, thereby be suitable for practicality more.
An also purpose of the present invention is, a kind of heat radiation module is provided, and technical matters to be solved is to make its framework with an insulation material, can avoid the assembler to get an electric shock when this heat radiation module of assembling, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of heat radiation module according to the present invention's proposition, be suitable for carrying projector's power supply circuit board and projector's start-up circuit plate, and this projector's power supply circuit board and this projector's start-up circuit plate dispelled the heat, this heat radiation module comprises: a framework, this framework has an air intake vent and an air outlet, wherein this projector's power supply circuit board and this projector's start-up circuit plate are to be fixed in this framework, and are to form an air channel between this air intake vent and this air outlet; One fan assembling grove is connected in this air outlet place of this framework; One fan is disposed in this fan assembling grove; And a spring secures rail to sleeper, this fan is fixed in this fan assembling grove.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid heat radiation module, wherein said framework comprise most group conduits, and this projector's power supply circuit board and this projector's start-up circuit plate are to be assembled in this framework by those group conduits.
Aforesaid heat radiation module, wherein said framework comprises: a top board; One base plate is positioned at this top board below; And two side plates, be connected between this top board and this base plate, wherein have those group conduits on those side plates.
Aforesaid heat radiation module, wherein those group conduits of part are to be adjacent to this top board to distribute, and those group conduits of part are to be adjacent to this backplane.
Aforesaid heat radiation module, wherein said framework more comprises a holes, this holes is the subregion that is extended to those side plates by this base plate.
Aforesaid heat radiation module, wherein said top board, base plate and those side plates are integrally formed.
Aforesaid heat radiation module, wherein said framework comprise most group ribs, and this projector's power supply circuit board and this projector's start-up circuit plate are to be assembled in this framework by those group ribs.
Aforesaid heat radiation module, wherein said framework comprises: a top board; One base plate is positioned at this top board below; And two side plates, be connected between this top board and this base plate, wherein have those group ribs on those side plates.
Aforesaid heat radiation module, wherein those group ribs of part are to be adjacent to this top board to distribute, and those group ribs of part are to be adjacent to this backplane.
Aforesaid heat radiation module, wherein said framework more comprises a holes, this holes is the subregion that is extended to those side plates by this base plate.
Aforesaid heat radiation module, wherein said top board, base plate and those side plates are one-body molded.
Aforesaid heat radiation module, wherein said fan assembling grove have most salient points.
Aforesaid heat radiation module, wherein said spring secures rail to sleeper have most perforates, and this spring secures rail to sleeper is the collocation by those perforates and those salient points, and are equipped on this fan assembling grove.
Aforesaid heat radiation module, it more comprises most cushion pads, is disposed between this spring secures rail to sleeper and this fan.
Aforesaid heat radiation module, it more comprises most cushion pads, is disposed between this fan and this fan assembling grove.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, the present invention proposes a kind of heat radiation module, is suitable for carrying projector's power supply circuit board and projector's start-up circuit plate, and it is dispelled the heat.This heat radiation module comprises a framework, a fan assembling grove, a fan and a spring secures rail to sleeper.Framework has an air intake vent and an air outlet, and wherein projector's power supply circuit board and projector's start-up circuit plate are to be fixed in the framework, and is to form an air channel between air intake vent and the air outlet.In addition, the fan assembling grove is the air outlet place that is connected in framework, and spring secures rail to sleeper can be fixed in fan in the fan assembling grove, so that fan can be simultaneously to projector's power supply circuit board and projector's start-up circuit plate heat radiation outside framework.
According to the described heat radiation module of preferred embodiment of the present invention, wherein framework comprises most group conduits or most group rib, and projector's power supply circuit board and projector's start-up circuit plate are to be assembled in the framework by these group conduits or rib, and framework comprises a top board, a base plate and two side plates.Base plate is the below that is positioned at top board, and two side plates are connected between top board and the base plate, and has these group conduits or these group ribs on the side plate.These group conduits of part or these group ribs are to be adjacent to top board to distribute, and these group conduits of part or these group ribs are to be adjacent to backplane.
According to the described heat radiation module of preferred embodiment of the present invention, wherein framework more comprises a holes, and this holes is the subregion that is extended to these side plates by base plate.
According to the described heat radiation module of preferred embodiment of the present invention, wherein top board, base plate and these side plates are one-body molded.
According to the described heat radiation module of preferred embodiment of the present invention, wherein the fan assembling grove has most salient points, and spring secures rail to sleeper has most perforates, and spring secures rail to sleeper is to be equipped on the fan assembling grove by the collocation of these perforates and these salient points.
According to the described heat radiation module of preferred embodiment of the present invention, more comprise most cushion pads, be disposed between spring secures rail to sleeper and the fan and fan and fan assembling grove between.
By technique scheme, the present invention's module that dispels the heat has the following advantages at least:
The present invention is because adopt the heat radiation module with a fan assembling grove and a spring secures rail to sleeper, and the collocation by the perforate of the salient point of fan assembling grove and spring secures rail to sleeper makes the assembler fan to be equipped in the fan assembling grove hand tool ground.
In addition, the present invention because be disposed at a majority cushion pad between spring secures rail to sleeper and the fan and fan and fan assembling grove between, so can reduce the vibrations situation that the fan after having locked is produced in the running, and then the noise that is sent can reduce fan running the time.
In addition, the present invention is most heat radiation modules of organizing the framework of conduits or rib because of employing has, make the assembler needn't use hand tool, just most circuit boards can be equipped in the framework, therefore can save the populated circuit board time, and can reduce assembly cost, and can avoid the assembler when this heat radiation module of assembling, to get an electric shock.
Moreover, the present invention is because only be to use a fan to be equipped on an air outlet of framework, therefore just heat radiation that can the circuit board in the framework is suitable can be saved and be made the cost that heat radiation module person purchases fan, and fan is assembled to assembly cost on the projection display casing.
In sum, the heat radiation module of special construction of the present invention, has above-mentioned plurality of advantages, and in like product, do not see have similar structures design to publish or use and really belong to innovation, no matter it structurally or bigger improvement is all arranged on the function, has technically than much progress, and produced handy and practical effect, thereby being suitable for practicality more, having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Figure 1A is the exploded perspective synoptic diagram that has known a kind of module that dispels the heat now.
Figure 1B is existing known a kind of synoptic diagram that projector's power supply circuit board and projector's start-up circuit plate is dispelled the heat with fan.
Fig. 2 A is the exploded perspective synoptic diagram of a kind of module that dispels the heat of first embodiment of the invention.
Fig. 2 B is the unitized construction schematic perspective view of a kind of module that dispels the heat of first embodiment of the invention.
Fig. 3 A is the exploded perspective synoptic diagram of a kind of module that dispels the heat of second embodiment of the invention.
Fig. 3 B is the unitized construction schematic perspective view of a kind of module that dispels the heat of second embodiment of the invention.
2,4: screw 10: projector's power supply circuit board
12,22: screw 20: projector's start-up circuit plate
101,102: heat radiation module 110: fan
112: pilot hole 120: the fan assembling grove
122: assembly hole 201,202: the heat radiation module
210: framework 212a: top board
212b: base plate 212c, 212d: side plate
214a: air intake vent 214b: air outlet
216a: conduit 216b: rib
218: holes 220: the fan assembling grove
222: salient point 230: fan
240: spring secures rail to sleeper 242: perforate
250: cushion pad
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of heat radiation module, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
First embodiment
Fig. 2 A is the exploded perspective synoptic diagram of a kind of module that dispels the heat of first embodiment of the invention, and Fig. 2 B is the combination schematic perspective view of a kind of module that dispels the heat of first embodiment of the invention.See also shown in Fig. 2 A and Fig. 2 B, the heat radiation module 201 of first embodiment of the invention, can be used for carrying projector's power supply circuit board (power board) 10 and one projector's start-up circuit plate (ballast board) 20, and this projector's power supply circuit board (power board) 10 and projector's start-up circuit plate (ballast board) 20 are dispelled the heat.
Have most group conduit 216a on the inwall of side plate 212c, the 212d of framework 210, wherein part conduit 216a is adjacent to top board 212a to distribute, and part conduit 215a is adjacent to base plate 212b to distribute, make the assembler projector's power supply circuit board 10 and projector's start-up circuit plate 20 to be assembled in the framework 210 by conduit 216a, and hand tool that needn't be any.
Also in other words, fan 230 is the air outlet 214b places that are positioned at framework 210, under the running of fan 230, extraneous air can enter via the air intake vent 214a of framework 210 in the framework 210, and the heat that projector's power supply circuit board 10 and projector's start-up circuit plate 20 are produced when the running, mode with thermal convection is extremely extraneous with heat discharge via the air outlet 214b of framework 210, makes projector's power supply circuit board 10 and projector's start-up circuit plate 20 can keep normal operation.
Therefore the material of framework 210 for example is the insulating material of plastics, and the heat radiation module 201 of this first embodiment can utilize the technology such as characteristic, Mould Machining manufacturing of plastics ejection formation fully, to promote the manufacturing speed of framework 210.
The material of spring secures rail to sleeper 240 for example is the good rustless property metal of elasticity, and the material of cushion pad 250 for example is the good material of elasticity, therefore the module 201 that dispels the heat can utilize above-mentioned material behavior fully, to lower the noise that the vibrations of fan 230 when running up are sent.
In addition, the shape of framework 210 is not limited to the rectangular body of above-mentioned hollow type, also can be a hollow type pipe body (not shown), it comprises a holes (not shown) in the side of hollow type pipe body, wherein an end of this hollow type pipe body can be a rectangle (not shown), it can connect fan assembling grove 220, and fan 230 can be disposed in the fan assembling grove 220.
Second embodiment
Fig. 3 A is the exploded perspective synoptic diagram of a kind of module that dispels the heat of second embodiment of the invention, and Fig. 3 B is the unitized construction schematic perspective view of a kind of module that dispels the heat of second embodiment of the invention.See also shown in Fig. 3 A and Fig. 3 B, compared to first embodiment, have most group rib 216b on the inwall of the framework 210 of the heat radiation module 202 of second embodiment of the invention, then the heat radiation module 201 with first embodiment is identical for the composition assembly of remaining heat radiation module 202 and relative position thereof.In other words, the heat radiation module 202 of second embodiment of the invention mainly is that the conduit 216a with the framework 210 of the heat radiation module 201 of first embodiment changes to rib 216b, in the hope of reaching the effect identical with first embodiment.
Anyly know this skill person and also can know, because the size of each circuit board is not identical, therefore the assembler can be disposed in the conduit 216a or rib 216b of framework 210 according to the size difference of each circuit board, so the arrangement of each circuit board in framework 210 is not that the mode that is parallel to top board 212a or base plate 212b is only arranged, can also presss from both sides a certain angle with top board 212a or base plate 212b and be arranged in the framework 210.In other words, as long as each circuit board can be disposed in the framework 210, any angle of arrangement mode that it is any and top board 212a or base plate 212b is all possible.In addition, as long as framework 210 is a ducted body, do not limit as for the shape of this ducted body.
In sum, radiating module of the present invention has following design feature and advantage:
(1), the present invention's module that dispels the heat has the heat radiation module of a fan assembling grove and a spring secures rail to sleeper, collocation by the perforate of the salient point of fan assembling grove and spring secures rail to sleeper, make the assembler fan to be equipped in the fan assembling grove hand tool ground, therefore can save the assembler is assembled in the time of fan assembling grove with fan, and then can reduce assembly cost.
(2), the spring secures rail to sleeper of module for example is the good rustless property metal of elasticity because the present invention is dispelled the heat, and the material of cushion pad for example is the good material of elasticity, therefore the present invention's module that dispels the heat can make full use of above-mentioned material behavior, lowering the vibrations that fan is produced when running up, and can reduce the noise that it sends.
(3), the present invention's module that dispels the heat has the frameworks of most group conduits or rib; make the assembler needn't use any hand tool; just most circuit boards can be equipped in the framework; therefore can save the time of assembler's populated circuit board; and then can reduce assembly cost; and can avoid the assembler when this heat radiation module of assembling, to get an electric shock, so can protect the security of assembler when this heat radiation module of assembling.
(4), the present invention only uses a fan to be equipped on an air outlet of framework, therefore just heat radiation that can the circuit board in the framework is suitable can save the Material Cost of making the heat radiation module, and fan is assembled to assembly cost on the projection display casing.
(5), the present invention for example has heat radiation module for the framework of the insulation material of plastics because of employing, and framework more comprises a holes, it can increase the stress tolerances of framework.Therefore can be by technology such as the characteristic of plastics ejection formation, Mould Machining manufacturings, and improve the manufacturing speed of the framework of heat radiation module, the acceptance rate of ejection formation.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (15)
1, a kind of heat radiation module is suitable for carrying projector's power supply circuit board and projector's start-up circuit plate, and this projector's power supply circuit board and this projector's start-up circuit plate are dispelled the heat, and it is characterized in that this heat radiation module comprises:
One framework, this framework have an air intake vent and an air outlet, and wherein this projector's power supply circuit board and this projector's start-up circuit plate are to be fixed in this framework, and are to form an air channel between this air intake vent and this air outlet;
One fan assembling grove is connected in this air outlet place of this framework;
One fan is disposed in this fan assembling grove; And
One spring secures rail to sleeper is fixed in this fan in this fan assembling grove.
2, heat radiation module according to claim 1 it is characterized in that wherein said framework comprises most group conduits, and this projector's power supply circuit board and this projector's start-up circuit plate is to be assembled in this framework by those group conduits.
3, heat radiation module according to claim 2 is characterized in that wherein said framework comprises:
One top board;
One base plate is positioned at this top board below; And
Two side plates are connected between this top board and this base plate, wherein have those group conduits on those side plates.
4, heat radiation module according to claim 3 it is characterized in that wherein those group conduits of part are to be adjacent to this top board to distribute, and those group conduits of part is to be adjacent to this backplane.
5, heat radiation module according to claim 3 is characterized in that wherein said framework more comprises a holes, and this holes is the subregion that is extended to those side plates by this base plate.
6, heat radiation module according to claim 3 is characterized in that wherein said top board, base plate and those side plates are integrally formed.
7, heat radiation module according to claim 1 it is characterized in that wherein said framework comprises most group ribs, and this projector's power supply circuit board and this projector's start-up circuit plate is to be assembled in this framework by those group ribs.
8, heat radiation module according to claim 7 is characterized in that wherein said framework comprises:
One top board;
One base plate is positioned at this top board below; And
Two side plates are connected between this top board and this base plate, wherein have those group ribs on those side plates.
9, heat radiation module according to claim 8 it is characterized in that wherein those group ribs of part are to be adjacent to this top board to distribute, and those group ribs of part is to be adjacent to this backplane.
10, heat radiation module according to claim 8 is characterized in that wherein said framework more comprises a holes, and this holes is the subregion that is extended to those side plates by this base plate.
11, heat radiation module according to claim 8 is characterized in that wherein said top board, base plate and those side plates are one-body molded.
12, heat radiation module according to claim 1 is characterized in that wherein said fan assembling grove has most salient points.
13, heat radiation module according to claim 12 is characterized in that wherein said spring secures rail to sleeper has most perforates, and this spring secures rail to sleeper is the collocation by those perforates and those salient points, and is equipped on this fan assembling grove.
14, heat radiation module according to claim 1 is characterized in that it more comprises most cushion pads, is disposed between this spring secures rail to sleeper and this fan.
15, heat radiation module according to claim 1 is characterized in that it more comprises most cushion pads, is disposed between this fan and this fan assembling grove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000503 CN1641476A (en) | 2004-01-08 | 2004-01-08 | Radiating module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000503 CN1641476A (en) | 2004-01-08 | 2004-01-08 | Radiating module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1641476A true CN1641476A (en) | 2005-07-20 |
Family
ID=34866778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410000503 Pending CN1641476A (en) | 2004-01-08 | 2004-01-08 | Radiating module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1641476A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101208003B (en) * | 2006-12-21 | 2010-09-01 | 株式会社电装 | Electronic apparatus cooling structure |
| CN101923276A (en) * | 2010-07-27 | 2010-12-22 | 深圳雅图数字视频技术有限公司 | Projector fan and projector |
| US7985056B2 (en) | 2007-05-11 | 2011-07-26 | Delta Electronics, Inc. | Fan and fan assembly |
| CN101307769B (en) * | 2007-05-16 | 2013-04-03 | 台达电子工业股份有限公司 | Fan and fan component |
-
2004
- 2004-01-08 CN CN 200410000503 patent/CN1641476A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101208003B (en) * | 2006-12-21 | 2010-09-01 | 株式会社电装 | Electronic apparatus cooling structure |
| US7985056B2 (en) | 2007-05-11 | 2011-07-26 | Delta Electronics, Inc. | Fan and fan assembly |
| CN101307769B (en) * | 2007-05-16 | 2013-04-03 | 台达电子工业股份有限公司 | Fan and fan component |
| CN101923276A (en) * | 2010-07-27 | 2010-12-22 | 深圳雅图数字视频技术有限公司 | Projector fan and projector |
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