TWI407240B - Heat dissipation structure for dmd and projector use same - Google Patents

Abstract

The present invention relates to a hear dissipation for an DMD, which includes a body, an DMD module, a heat conductor, a fan, a light source and a blast pipe. The DMD module is attached on the body. The heat conductor contacts to a rear surface of the DMD module by one end thereof. The fan is mounted on a side of the body and contacts to the other end of the heat conductor. The fan includes a vent. The light source having a cooling inlet is mounted on the body. The blast pipe is disposed between the light source and the fan with aligning to the vent and the cooling inlet by two opposite ends of the blast pipe.

Description

DMD heat dissipation structure and its application projector

The invention relates to a heat dissipation structure, in particular to a DMD heat dissipation structure and a projector using the same.

A digital mirror device (hereinafter referred to as DMD) is an important digital optical device currently used in projectors, which reflects light through tens of thousands of tiny controllable lenses to form a picture. The light from the projector in the projector illuminates the DMD and the temperature of the DMD rises. At the same time, a large number of control circuits integrated on the DMD generate considerable heat during operation, which causes the DMD temperature to rise. Excessive temperatures can reduce the life of the DMD and can even damage the DMD. For this reason, the heat dissipation fins are usually used to dissipate the DMD. However, the heat dissipation fins are not efficient in heat dissipation because the heat dissipation fins only dissipate heat through the heat conduction of the fins, and the number and size of the heat dissipation fins are received by the projector. The limitation of the internal narrow space makes the area of the heat dissipation fins in contact with the air small, and cannot effectively dissipate heat.

In view of the above, it is necessary to provide a DMD heat dissipation structure capable of effectively dissipating DMD and a projector using the DMD heat dissipation structure.

A DMD heat dissipation structure includes a optomechanical body, a DMD module, a heat conducting component, a fan, a light source component and a draft tube. The DMD module is disposed on the illuminant body. One end of the heat conducting element is in close contact with the back of the DMD module away from the center of the light machine body. The fan is disposed on the side of the optical machine body opposite to the DMD module, and is attached to the other end of the heat conducting component Hehe. The fan includes a casing disposed on the luminaire body and a fan disposed inside the casing, and the casing is provided with an air inlet and an air outlet extending through the casing, and the casing surrounds the air inlet Forming a plurality of support arms disposed radially along the air inlet, a support plate is formed at an end of the support arm, the support plate supports a fan of the fan, and the light source element is disposed at the light The other side of the fan body adjacent to the fan, the light source element is provided with a cooling tuyere. The air guiding tube is disposed between the fan and the light source component, and one end opening is located at an air outlet of the fan, and the other end is opposite to a cooling air outlet of the light source component.

A projector includes a casing and a plurality of system fans. The projector further includes a DMD heat dissipation structure as described above, the DMD heat dissipation structure is disposed inside the casing, and the first air outlet is respectively disposed on the side wall of the fan and the light source component corresponding to the DMD heat dissipation structure on the casing And a second tuyere, the plurality of system fans are disposed in the casing and are opposite to the second tuyere of the casing.

Compared with the prior art, the DMD heat dissipation structure of the present invention and the projector for the same use the same fan to dissipate the DMD module and the light source component, thereby saving the heat dissipation fins used in the prior art to dissipate the DMD module. At the same time, the heat dissipation of the DMD module can be accelerated by the fan. In addition, the fan can be used to dissipate heat from the DMD module and the light source component at the same time.

100‧‧‧DMD heat dissipation structure

110‧‧‧ body

112‧‧‧First carrying wall

112a‧‧‧ Empty window

114‧‧‧Second bearing wall

120‧‧‧DMD module

130‧‧‧thermal element

132‧‧‧thermal sheet

134‧‧‧thermal column

140‧‧‧fan

142‧‧‧ Shell

142a‧‧‧ air inlet

144‧‧‧Support arm

146‧‧‧support plate

150‧‧‧Light source components

160‧‧‧ guide tube

162‧‧‧first open end

164‧‧‧second open end

166‧‧‧Fixed block

200‧‧‧Projector

210‧‧‧Shell

220‧‧‧System fan

212‧‧‧First air outlet

214‧‧‧second air outlet

1 is an exploded perspective view of a DMD heat dissipation structure provided by the present invention.

2 is an assembled view of the DMD heat dissipation structure of FIG. 1.

3 is a schematic view of a projector to which the DMD heat dissipation structure of FIG. 1 is applied.

Referring to FIGS. 1 and 2, a DMD heat dissipation structure 100 according to a preferred embodiment of the present invention is provided. The DMD heat dissipation structure 100 includes a optomechanical body 110, a DMD module 120, a heat conducting component 130, a fan 140, a light source component 150, and a flow guiding tube 160. The DMD module 120 is disposed in the On the optomechanical body 110. One end of the heat conducting component 130 is in close contact with the back of the DMD module 120. The fan 140 is disposed on the side of the optical unit 110 opposite to the DMD module 120 and is adjacent to the other end of the heat conducting component 130. The fan 140 includes an air outlet 141. The light source assembly 150 is disposed on the other side of the optical unit 110 adjacent to the fan 140. The light source assembly 150 is provided with a cooling tuyere (not shown). The air guiding tube 160 is disposed between the fan 140 and the light source component 150, and has one end opening at the air outlet 141 of the fan 140 and the other end facing the cooling air outlet of the light source assembly 150.

The optical machine body 110 is internally provided with a plurality of optical components (such as a color wheel, an integrating column, a prism group, a mirror, and an injection lens group) for modulating light, for directional propagation of the light source component. The emitted light is sent to the DMD module 120 and reflected by the DMD module 120 to be imaged on a light screen or a screen. The optomechanical body 110 includes a first carrier wall 112 and a second carrier wall 114. The first carrying wall 112 is substantially perpendicular to the second carrying wall 114 , and an empty window 112 a is disposed on the first carrying wall 112 for receiving the DMD module 120 . The second carrying wall 114 is configured to carry the light source component 150, and a light passing hole (not shown) for passing light is disposed on the second carrying wall 114.

The DMD module 120 is disposed on the optical body 110 and is received in the empty window 112a of the first carrying wall 112, and the mirror surface of the DMD module 120 faces the optical body The inside of the 110, the other side opposite to the mirror faces the outside of the optomechanical body 110.

The heat conducting component 130 includes a heat conducting sheet 132 and a heat conducting pillar 134. The heat conducting sheet 132 is attached to the other side of the DMD module 120 opposite to the mirror side thereof, and the heat conducting pillar 134 is pressed at the same. The heat conductive sheet 132 is described. The heat conducting sheet 132 is made of a heat conductive material such as a thermal conductive paste, a thermal grease, a heat dissipating oil, a thermal conductive mud or the like, so that the heat conducting column 134 is in good contact with the heat generating surface of the DMD module 120 to effectively conduct the DMD module 120. Heat generated by heat.

The fan 140 is disposed outside the first carrier wall 112 of the optomechanical body 110, and is coupled to the DMD Modules 120 are aligned with each other. The fan 140 includes a housing 142 disposed on the first carrier wall 112 and a fan (not shown) disposed inside the housing 142. An air inlet 142a penetrating the outer casing 142 is disposed on the outer casing 142, and a plurality of support arms 144 radially disposed along the air inlet 142a are formed at a position of the outer casing 142 around the air inlet 142a. The end of the support arm 144 is formed with a support plate 146 for supporting the fan of the fan 140 and being tightly pressed against the other end of the heat transfer column 134. The air outlet 141 is formed on the outer casing 142, and an axis of the air outlet 141 is substantially perpendicular to an axis of the air inlet 142a. The outer casing 142, the support arm 144 and the support plate 146 of the fan 140 are made of a material having good thermal conductivity such as iron, aluminum, magnesium or an alloy material of the above materials, thereby rapidly diffusing heat conducted by the heat conducting column 134 to the fan 140. The outer casing 142, the support arm 144 and the support plate 146 are used to increase the air circulation speed by the fan of the fan 140 to accelerate the heat dissipation. It can be understood that a heat conducting interface material such as a thermal conductive paste, a thermal grease, a heat dissipation oil, a thermal conductive mud or the like may be disposed between the heat conducting column 134 and the support plate 146 to improve the relationship between the heat conducting column 134 and the supporting plate 146. Thermal conductivity. In addition, the heat conducting column 134 may be integrally formed with the support plate 146.

The light source component 150 is disposed on the second carrier wall 114 of the optomechanical body 110 for providing light. The light source component 150 is generally a high-pressure mercury lamp or a halogen lamp. When a very large amount of heat is generated during use, a cooling air port is disposed on the light source component 150 for cooling the light source component by the fan 140 to ensure that the light source component 150 does not Damaged due to overheating.

The guide tube 160 is a tubular shape closed at both ends of the opening, and can be designed into different shapes according to different requirements. In the embodiment, the arc shape is adopted to facilitate reducing the wind resistance. The guide tube 160 is disposed between the fan 140 and the light source component 150 and includes a first open end 162 and a second open end 164. The first open end 162 of the draft tube 160 is disposed at the air outlet 141 of the fan 140 and communicates with the air outlet 141. The second open end 164 is opposite to the cooling air outlet of the light source element 150. The draft tube 160 guides the airflow generated by the fan 140 to the light The light source element 150 is dissipated at the cooling tuyere of the source element 150. The material of the draft tube 160 may be a plastic material or a metal material. In order to prevent the flow guiding tube 160 from being displaced, a fixing block 166 may be disposed on the outer side of the tube body of the draft tube 160, and the guiding tube 160 is firmly fixed to the optical machine body through the fixing block 166. 110 on.

In use, the heat generated by the DMD module 120 is conducted to the outer casing 142, the support arm 144, and the support plate 146 of the fan 140 through the heat conductive element 130. The air around the fan 140 is accelerated by the fan of the fan 140, thereby taking away heat that has spread to the outer casing 142, the support arm 144, and the support plate 146. At the same time, the airflow generated by the fan 140 flows out of its air outlet 141, and is guided to the cooling air vent of the light source element 150 through the air guiding cylinder 160 to dissipate the light source element 150. Because the heat generated by the DMD module 120 is much smaller than the heat generated by the light source component 150, the heat generated by the DMD module 120 causes the temperature of the airflow of the fan 140 to be very limited. Therefore, the DMD module 120 is performed. The cooled airflow can still effectively dissipate heat from the light source component 150. The heat dissipation fins for dissipating heat to the DMD module 120 in the prior art can be saved by the same fan 140, and the heat dissipation fins for dissipating the DMD module 120 in the prior art can be saved. The effect is better than the passive heat dissipation using heat sink fins. In addition, the use efficiency of the fan 140 can be improved.

It can be understood that the structure of the heat conducting column 134 disposed between the fan 140 and the DMD module 120 can be different according to different requirements, as long as the heat conducting column 134 can effectively contact the fan 140 and does not affect the air inlet 142a of the fan 140. The air inlet effect is sufficient, for example, the heat conducting column 134 may be in the shape of a grid arranged in a ring shape.

Referring to FIG. 3, a projector 200 using the above-described DMD heat dissipation structure 100 is provided by a preferred embodiment of the present invention. The projector 200 includes a casing 210, a plurality of system fans 220, and the above-described DMD heat dissipation structure 100. The DMD heat dissipation structure 100 is disposed inside the casing 210. A first wind is respectively disposed on the side wall of the casing 210 corresponding to the fan 140 and the light source assembly 150 Port 212 and second tuyere 214. The plurality of system fans 220 are disposed in the casing 210 and are opposite to the second tuyere 214 of the casing 210. In use, air enters the casing 210 from the first tuyere 212, a portion of the heat is dissipated to the DMD module 120 and the light source component 150 by the fan 140, and the other portion is internally operated by the system fan 220 to the entire interior of the projector 200. The system further dissipates heat, thereby effectively reducing the operating temperature inside the projector 200 and ensuring that the projector 200 operates normally.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

100‧‧‧DMD heat dissipation structure

110‧‧‧ body

112‧‧‧First carrying wall

112a‧‧‧ Empty window

114‧‧‧Second bearing wall

120‧‧‧DMD module

130‧‧‧thermal element

132‧‧‧thermal sheet

134‧‧‧thermal column

140‧‧‧fan

142‧‧‧ Shell

142a‧‧‧ air inlet

144‧‧‧Support arm

146‧‧‧support plate

150‧‧‧Light source components

160‧‧‧ guide tube

162‧‧‧first open end

164‧‧‧second open end

166‧‧‧Fixed block

200‧‧‧Projector

210‧‧‧Shell

220‧‧‧System fan

212‧‧‧First air outlet

214‧‧‧second air outlet

Claims (13)

A DMD heat dissipation structure includes a optomechanical body, a DMD module, a heat conducting component, a fan, a light source component and a flow guiding tube, and the DMD module is disposed on the optomechanical body, One end of the heat conducting component is closely attached to a back of the DMD module remote from the center of the optical machine body, and the fan is disposed on the side of the optical machine body opposite to the DMD module, and is thermally conductive The other end of the component is attached. The fan includes a casing disposed on the illuminator body and a fan disposed inside the casing, and the casing is provided with an air inlet and an air outlet extending through the casing. A support arm radially disposed along the air inlet is formed at a position of the outer casing around the air inlet, and a support plate is formed at an end of the support arm, and the support plate supports the fan of the fan. The light source component is disposed on a side of the optical machine body adjacent to the fan, and the light source component is provided with a cooling air vent disposed between the fan and the light source component, and one end opening is located At the air outlet of the fan, N-cooled tuyere opening at one end of the light source element. The DMD heat dissipation structure of claim 1, wherein the optomechanical body comprises a first carrier wall and a second carrier wall, the first carrier wall being substantially perpendicular to the second carrier wall An empty window is disposed on the first carrying wall, the DMD module is received in the empty window, and the light source component is disposed on the second carrying wall. The DMD heat dissipation structure of claim 2, wherein the heat conduction element comprises a heat conductive sheet and a heat conducting column, the heat conductive sheet is attached to the DMD module, and the heat conducting column is pressed On the thermal pad. The DMD heat dissipation structure according to claim 3, wherein the heat conductive sheet is made of a thermal conductive paste, a thermal grease, a heat dissipation oil or a thermal conductive mud. The DMD heat dissipation structure according to claim 3, wherein: the fan casing is set On the first carrier wall, the support plate is tightly pressed against the other end of the heat conducting column. The DMD heat dissipation structure according to claim 5, wherein the axis of the air outlet is substantially perpendicular to the axis of the air inlet. The DMD heat dissipation structure according to claim 5, wherein the outer casing, the support arm and the support plate of the fan are made of a heat conductive metal material. The DMD heat dissipation structure according to claim 5, wherein a thermal interface material is disposed between the heat conducting column and the support plate. The DMD heat dissipation structure of claim 5, wherein the heat conducting column is integrally formed with the support plate. The DMD heat dissipation structure according to claim 1, wherein the guide tube is a tubular shape closed at both ends of the opening. The DMD heat dissipation structure according to claim 10, wherein the guide tube is curved. The DMD heat dissipation structure according to claim 10 or 11, wherein: the outer side of the tube body of the draft tube is provided with a fixing block, and the tube is fixed to the machine of the optical machine by the fixing block. Body. A projector comprising a casing and a plurality of system fans, wherein the projector further comprises: the DMD heat dissipation structure according to claim 1 , wherein the DMD heat dissipation structure is disposed inside the casing, a first air outlet and a second air outlet are respectively disposed on the side wall of the fan and the light source component corresponding to the DMD heat dissipation structure on the casing, and the plurality of system fans are disposed in the casing and the second air outlet of the casing Relatively positive.