CN101281353B - Projector and its network card cooling method - Google Patents

Abstract

A cooling method for a projector network card comprises: providing the network card; the network card is arranged in the projector having an integrated circuit; providing a cooling wind channel for cooling the optical component of the projector; the optical component comprises a red, green and blue optical components; the cooling wind channel comprises a red optical component wind guiding pipe, a green optical component wind guiding pipe and a blue optical component wind guiding pipe which are respectively used for the red, green and blue optical components; the cooling wind channel is arranged with a branch wind guiding pipe connected to the network card integrated circuit for obtaining a potion of wind quantity to the integrated circuit. The invention also relates to a projectoe using the network card cooling method of this invention.

Description

Projector and its network card cooling method

technical field

The invention relates to a cooling method for a projector network card. The invention also relates to a projector using the network card cooling method.

Background technique

With the rapid development of projector technology, it has become a market trend to develop projectors with miniaturization, high performance, and lower operating temperature. At present, there is a need for such a projector, which has small volume, high illuminance, fewer fans in the projector, low noise during operation, and acceptable temperature.

For a projector with a wireless network card or a wired network card, it is difficult to dissipate heat because the integrated circuit (IC) of the network card generates a lot of heat during operation, and usually all need to be shielded by sheet metal components. In addition, in the prior art, heat dissipating glue is generally used on the integrated circuit, which is not only costly, but also difficult to meet the requirement of sufficient heat dissipation.

Contents of the invention

In view of the above, the present invention provides a cooling method for a projector network card, the method includes: providing a network card, the network card is arranged in the projector, and has an integrated circuit; Cooling ducts for projector optics, said optics comprising red, green and blue optics, said cooling ducts comprising red optics ducts for cooling said red, green and blue optics respectively , the air duct of the green optical component and the air duct of the blue optical component; wherein, a branch air duct leading to the integrated circuit of the network card is arranged in the cooling air channel, so as to divide a part of the air volume to the integrated circuit.

According to an aspect of the present invention, a branch air duct for cooling the network card integrated circuit is provided on the air duct of the red optical component.

According to another aspect of the present invention, a branch air duct for cooling the network card integrated circuit is provided on the air duct of the green optical component.

According to another aspect of the present invention, the network card is arranged adjacent to the cooling air duct of the optical component.

According to another aspect of the present invention, the network card is arranged on the side wall of the projector near the cooling air duct of the optical component.

The present invention also provides such a projector, which includes a casing, a power supply unit, a light source unit, an optical system, a cooling assembly and a network card, and the projector is characterized in that the network card cooling method described above is adopted.

Therefore, according to the present invention, by providing a novel network card cooling method, through the reasonable design of the cooling air duct, it is possible to avoid adding fans for network card cooling, reduce the noise of the whole projector, and omit the integrated circuit. The heat dissipation glue saves the cost of materials, and at the same time makes the temperature of each electrical component of the network card meet the qualified requirements.

Description of drawings

FIG. 1 is a perspective view of a liquid crystal projector, which is an embodiment of a projection-type image display device according to the present invention, viewed obliquely from above from the front side.

Fig. 2 is a perspective view of the same liquid crystal projector viewed obliquely from the rear side.

Fig. 3 is a perspective view after removing the upper cover of Fig. 1 .

Fig. 4 is a perspective view after removing the main control substrate.

Fig. 5 is a perspective view with the optical system removed.

FIG. 6 is a plan view of FIG. 5 .

FIG. 7 is a diagram of a configuration example of an optical system.

Fig. 8 is an enlarged view of main parts of the light source lamp cooling mechanism of this embodiment, and is a perspective view seen obliquely from the front side upward.

Fig. 9 is a perspective view of the same light source lamp cooling mechanism viewed obliquely from the back side after the upper half of the air duct is removed.

Fig. 10 is a perspective view after removing the lamp holder of the light source from Fig. 9 .

Fig. 11 is a sectional view of main parts seen from the rear side.

Fig. 12 is an enlarged view of main parts of the optical component cooling mechanism in this embodiment, and is a perspective view viewed obliquely from the front side upward.

Figure 13 is a plan view of the above figure.

Figure 14 is a plan view with the optics removed from the above figure.

Figure 15 is a rear view after removing the lower half of the air duct from the above figure.

Fig. 16 is a perspective view of an exhaust fan unit constituting the exhaust mechanism of the present embodiment.

Fig. 17 is a perspective view of the rear side of the same exhaust fan unit.

Fig. 18 is a diagram of the working state of the fan assembly for reducing the temperature inside the projector according to the present invention, showing the general arrangement of the fans inside the projector and the directions of the suction airflow and the exhaust airflow.

Fig. 19-21 is the figure that uses fan 41 to cool the air guiding structure of IC on the network card.

Fig. 22-24 is the figure that uses fan 42 to cool the air guiding structure of IC on the network card.

Explanation of labels

1 LCD projector

2 housing

4 projection lenses

8 exhaust holes

10 power socket

12 light source units

13 optical system

14 Power supply unit body

15 Noise Suppression Filter Section

15a linear filter (coil)

16 suction fan

161 internal discharge port

162, 163 External outlet

164 air duct

17, 18 exhaust fan

19 light source lights

191 luminous tube

192 reflector

193 suction port

194 exhaust port

198 neck

20, 24, 39r, 39g, 39b condenser lens

21, 22 1st, 2nd integrating lens

23 polarizing beam splitter (PBS)

25, 26 1st, 2nd dichroic mirrors

27, 29, 31 total reflection mirror

28, 30 relay lens

32 image generation optical system

33 color synthetic prism

34r, 34g, 34b liquid crystal panel

35 prism components

36r, 36g, 36b exit side polarizer

37g, 37b front polarizer

38r, 38g, 38b incident side polarizer

41, 42, 43 suction fan

50 frames

51 exhaust fan unit

52 caps

Detailed ways

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

Fig. 1 is a perspective view of a liquid crystal projector of an embodiment of the projection type image display device of the present invention seen from the front side obliquely above, and Fig. 2 is a perspective view of the same liquid crystal projector viewed from the back side obliquely above, Fig. 3 is a perspective view after removing the upper cover of Fig. 1, Fig. 4 is a perspective view after removing the main control substrate, Fig. 5 is a perspective view after removing the optical system, and Fig. 6 is a plan view of Fig. 5 .

As shown in Fig. 1 and Fig. 2, the housing 2 constituting the outer contour of the liquid crystal projector 1 is a small, horizontally wide, thin cuboid shape, consisting of an upper cover 2a and a lower case 2b, and the upper cover 2a and the main control unit are removed. Substrate 3 then presents the interior as shown in FIG. 4 .

When viewed from the front side of the upper cover 2a, a projection window 5 exposing the projection lens 4 is formed on the left side. In addition, an operation window 6 for exposing an adjustment knob 4 a for adjusting zoom and focus of the projection lens 4 is formed corresponding to the above-mentioned projection window 5 on the left front portion of the top surface of the upper cover 2 a. Moreover, the operation display part 7 is provided in the left rear part of the top surface of the upper cover 2a.

On the other hand, when viewed from the front side, a plurality of slit-shaped exhaust holes 8 are formed on the right side wall of the lower case 2b. In addition, height-adjustable leg portions 9 are provided on both side corners of the bottom front portion of the lower case 2b. Furthermore, on the back side wall of the lower case 2b, a power socket 10 connected to a power plug and a group of input and output power terminals 11 for connecting various input and output power cables are exposed.

Inside the casing 2, as shown in FIGS. 3 and 4 , when viewed from the front side, a light source unit 12 is provided in the depth on the right side, and optical components from the light source unit 12 to the above-mentioned projection lens 4 are arranged in an approximately L-shape. System 13. The power supply unit body 14 is arranged in front of the light source unit 12, which includes a power supply circuit substrate provided with circuit components for supplying power to various parts of the device and a ballast circuit substrate provided with circuit components for supplying power to the light source lamp. In the light source unit 12 A noise suppression filter unit 15 that eliminates noise entering through the power outlet 10 is disposed behind the power supply socket 10 .

In this embodiment, the above-mentioned noise suppression filter part 15 is separated from the power supply unit body 14, and the separated noise suppression filter part 15 is arranged as close as possible to the back side wall of the housing where the power socket 10 is provided and the power supply unit. The position of the body 14 . Specifically, the power supply unit body 14 is arranged along the front side wall of the horizontally wide type housing 2, and a linear filter ( Coil) 15a and other noise suppression filter section 15.

On the other hand, on the back side of the irradiation direction of the above-mentioned light source unit 12, as the first fan constituting the light source lamp cooling mechanism, the suction fan 16 composed of a vortex fan is arranged, and on the side side, as the second fan constituting the light source lamp cooling mechanism. The fan is equipped with an exhaust fan 17 composed of an axial fan.

Further, on the side surface of the power supply unit main body 14, an exhaust fan 18 composed of an axial flow fan is arranged laterally side by side with the exhaust fan 17 as a second exhaust fan constituting an exhaust mechanism. In addition, the exhaust fan 17 serving as the second fan constituting the above-mentioned light source lamp cooling mechanism also serves as the first exhaust fan constituting the above-mentioned exhaust mechanism.

FIG. 7 is a diagram showing a configuration example of the above-mentioned optical system 13 . In addition, the optical system 13 is not limited to the example shown in FIG. 7, and the present invention is applicable to mechanisms provided with various optical systems.

In Fig. 7, the white light from the light source lamp 19 passes through the condenser lens 20, the first integrator lens 21, the second integrator lens 22, the polarizing beam splitter (PBS) 23 and the condenser lens 24, etc., to the first dichroic The mirror 25 illuminates.

The first integrator lens 21 and the second integrator lens 22 are formed of fly-eye lenses in which a plurality of lens units are arranged in a matrix, respectively, and have a function of uniforming the illuminance distribution of the white light emitted by the light source lamp 19 .

In addition, the polarization beam splitter (PBS) 23 includes a polarization separation film and a retardation plate (1/2 wavelength plate). The polarization separation film transmits, for example, P-polarized light of the light from the second integrator lens 22 , and emits the S-polarized light with slightly changed optical path. P-polarized light transmitted through the polarized light separation film is converted into S-polarized light by a retardation plate provided on the front side (light-emitting side) thereof, and then emitted. That is, almost all the light is uniformly S-polarized.

The light passing through the polarizing beam splitter 23 reaches the first dichroic mirror 25 through the condenser lens 24 . The first dichroic mirror 25 has a function of reflecting only the blue component of light and passing the red and green components, and the passed red and green component light reaches the second dichroic mirror 26 . The second dichroic mirror 26 has a function of reflecting the green component of light and passing the red component. Therefore, the white light emitted by the light source lamp 19 is divided into blue light, green light, and red light by the first and second dichroic mirrors 25 and 26 .

The blue light reflected by the first dichroic mirror 25 is reflected by the total reflection mirror 27, the green light reflected by the second dichroic mirror 26 remains the same, and the red light passed through the second dichroic mirror 26 is reflected by the total reflection mirror through the relay lenses 28 and 30. 29, 31 reflection, and then lead to the image generation optical system 32 respectively.

In the image generating optical system 32, prisms such as a liquid crystal panel for red light 34r, a liquid crystal panel for green light 34g, and a liquid crystal panel for blue light 34b are detachably arranged on three side surfaces of a cube-shaped color synthesis prism 33. Component 35 (refer to FIG. 4 ). Between the color synthesis prism 33 and the liquid crystal panel 34r for red light, the output side polarizer 36r is arranged, and the output side polarizer 36g and the front polarizer 37g are arranged between the color synthesis prism 33 and the liquid crystal panel 34g for green light. Between the synthesizing prism 33 and the liquid crystal panel 34b for blue light, an exit-side polarizer 36b and a front polarizer 37b are arranged. Incident side polarizing plates 38r, 38g, 38b and condensing lenses 39r, 39g, 39b are disposed on the incident sides of the three liquid crystal panels 34r, 34g, 34b, respectively.

Thereby, the blue light reflected by the first dichroic mirror 25 and the total reflection mirror 27 is introduced into the condenser lens 39b for the blue light, passes through the incident side polarizer 38b, the blue light liquid crystal disc 34b, the front polarizer 37b, and the exit side polarizer. 36b, reaching the color synthesis prism 33. In addition, the green light reflected by the second dichroic mirror 26 is introduced into the condensing lens 39g for green light, passes through the incident-side polarizer 38g, the liquid crystal disk 34g for green light, the front polarizer 37g, and the exit-side polarizer 36g, It reaches the color synthesis prism 33. Similarly, the red light transmitted through the first dichroic mirror 25 and the second dichroic mirror 26 and reflected by the two total reflection mirrors 29 and 31 is introduced into the red light condenser lens 39r, passes through the incident side polarizing plate 38r, and the red light The light reaches the color synthesis prism 33 through the liquid crystal panel 34r and the output side polarizing plate 36r.

The three-color image light introduced into the color synthesis prism 33 is synthesized by the color synthesis prism 33 , and the color image light thus obtained is enlarged and projected on the front screen through the projection lens 4 .

8 to 11 are enlarged views of main parts of the light source lamp cooling mechanism in this embodiment. FIG. 8 is a perspective view viewed obliquely from the front side, and FIG. This is the case after removing the top half of the air duct. In addition, FIG. 10 is a perspective view of removing the light source lamp housing from the above-mentioned FIG. 9, and FIG. 11 is a sectional view of main parts seen from the back side.

The light source lamp 19 of this embodiment has a luminous tube 191 composed of a high-pressure mercury lamp or a metal halide lamp, and a reflector 192 with a parabolic reflective surface on its inner surface and an open front, arranged to cover the luminous tube 191 . In this reflector 192 , as shown in FIG. 10 , an intake port 193 and an exhaust port 194 are formed to face each other at the front opening edge.

The light source lamp 19 configured as above is attached to an aluminum lamp holder 195 as shown in FIGS. 8 and 9 . In this aluminum lamp frame 195, there is provided a heat-resistant glass plate 196 that closes the front opening of the reflector 192, and a plurality of small holes are formed corresponding to the air inlet 193 and the exhaust port 194 of the reflector 192. The ventilation net 197 of the luminous tube 191 is broken so that its fragments do not fly outside.

The traditional light source lamp cooling mechanism only considers the cooling of the light source lamp and configures the fan and its outlet, so even if the light source lamp can be cooled, the exhaust temperature will increase accordingly. Projection-type image display devices such as liquid crystal projectors require high output power of the light source lamp and miniaturization of the device at the same time. In the above-mentioned conventional technology, even if the light source lamp with high output power can be cooled, the exhaust temperature exceeds the user's tolerance. Therefore, it is difficult to simultaneously realize the cooling of the light source lamp and the reduction of the exhaust gas temperature. As a countermeasure against this, if the output (rotational speed) of the fan is increased, the noise of the fan will increase.

Therefore, in the present embodiment, as a fan for cooling the light source lamp 19, there is provided inside the light source lamp 19 an internal discharge port 161 communicating with the air intake port 193 formed on the above-mentioned reflector 192, and an internal discharge port 161 connected to the reflector 192. 192, an air suction fan (first fan) 16 for blowing air through the outlets 162 and 163 on the outer surface; Exhaust fan (second fan) 17. The suction fan 16 is composed of a vortex fan, and the exhaust fan 17 is composed of an axial fan.

The external discharge ports 162, 163 of the air intake fan 16 are formed away from the central portion of the outer surface of the reflector 192 of the light source lamp 19, and the exhaust fan 17 is arranged obliquely so that the suction direction is directed toward the air intake. The fan 16 is on the side of the discharge ports 162 and 163 for the outside.

The front end side of the air duct 164 extending toward the side of the light source lamp 19 from the suction fan 16 arranged on the side in the direction of irradiation of the light source lamp 19 is curved in an arc shape to the side of the light source lamp 19, and the above-mentioned discharge ports are formed on the front end surface. 161, 162, 163. The internal discharge port 161 is formed corresponding to the suction port 193 formed on the reflector 192 of the light source lamp 19, and two external discharge ports are formed away from the central part of the outer surface of the reflector 192 of the light source lamp 19 in the vertical direction. 162, 163.

As described above, the extent to which the discharge ports 162 and 163 for the outside of the suction fan 16 are separated from the central portion of the outer surface of the light source lamp 19 and the suction direction of the exhaust fan 17 are toward the discharge ports 162 and 163 for the outside of the suction fan 16 . The degree of lateral inclination can be set in consideration of the cooling of the light source lamp 19 and the exhaust temperature thereof.

With the configuration described above, the inside of the light source lamp 19 where the luminous tube 191 having the highest temperature is located can be efficiently cooled by using the discharge port 161 inside the suction fan 16 . In addition, the outer surface (including the neck 198 protruding from the rear end) of the reflector 192 of the light source lamp 19 that does not reach the high temperature inside the light source lamp 19 can be formed by the suction fan 16 that is separated from the center of the outer surface. Moderate cooling is performed on the outside through outlets 162 and 163 .

Moreover, the suction direction of the exhaust fan 17 is arranged obliquely toward the outside discharge ports 162 and 163 of the air suction fan 16, so that air from the outside of the air suction fan 16 formed away from the central portion of the outer surface of the light source lamp 19 While cooling the outer surface of the light source lamp 19 with the blowing air from the discharge ports 162 and 163, a part is directly sucked into the exhaust fan 17, and is discharged to the outside after being mixed with the exhaust gas that cools the inside of the light source lamp 19 and becomes high temperature, thereby reducing Exhaust gas temperature.

Therefore, the cooling of the light source lamp 19 and the reduction of the exhaust temperature can be realized simultaneously without excessively increasing the output power of the suction fan 16 and the exhaust fan 17, and noise can be suppressed.

In addition, by separating the external discharge ports 162 and 163 of the suction fan 16 from the central portion of the outer surface of the light source lamp 19 and forming two upper and lower ones, the outer surface of the light source lamp 19 can be cooled substantially uniformly.

Moreover, the extent to which the discharge ports 162 and 163 for the outside of the suction fan 16 are separated from the central portion of the outer surface of the light source lamp 19 and the exhaust fan 17 is tilted so that the suction direction thereof faces the discharge port for the outside of the suction fan 16 162 and 163 sides can be set in consideration of the cooling of the light source lamp 19 and its exhaust temperature, thereby meeting the requirements of high output power of the light source lamp 19 and miniaturization of the device, and flexibly making the light source lamp 19 The two points of cooling and reduction of exhaust gas temperature are achieved at the same time.

In addition, by forming the discharge ports 161 , 162 , and 163 of the suction fan 16 on the air duct 164 extending from the suction fan 16 to the light source lamp 19 , the degree of freedom in the arrangement position of the suction fan 16 can be increased.

As mentioned above, according to this embodiment, since the above-mentioned light source lamp cooling mechanism is provided, the output power of the fans 16, 17 will not be increased, and the cooling of the light source lamp 19 and the reduction of the exhaust temperature can be realized simultaneously without noise. Get suppressed LCD projector 1.

12 to 15 are enlarged views of main parts of the optical component cooling mechanism in this embodiment. FIG. 12 is a perspective view viewed obliquely from the front side, FIG. 13 is a plan view, and FIG. The plan view after the components, Figure 15 is the rear view after removing the lower half of the air duct.

As is well known, conventionally, one is provided for each color, and three fans are used to cool the three liquid crystal panels corresponding to red light, green light, and blue light, and the polarizers arranged on the incident side and the outgoing side of each liquid crystal panel.

However, the three liquid crystal panels corresponding to red light, green light, and blue light, and the polarizing plates arranged on the incident side and exit side of each liquid crystal panel, etc., have different degrees of temperature rise and ultraviolet degradation for each color, so the required The amount of cooling also varies. In particular, since blue light is close to the ultraviolet region, a large amount of cooling is required in order to prevent ultraviolet deterioration.

Projection-type image display devices such as liquid crystal projectors have been required to achieve high brightness due to high output power of light source lamps, downsizing of the device, and cost reduction (miniaturization of liquid crystal panels, etc.) at the same time, and high brightness has been achieved. And the amount of light per unit area increases.

However, the above-mentioned conventional technology that uses one fan for each color cannot cope with models with high brightness and increased light quantity per unit area. As a countermeasure against this, increasing the output (rotational speed) of the fan increases the noise of the fan. Furthermore, cooling of the PBS was performed.

Therefore, in this embodiment, on the incident side and the outgoing side of each liquid crystal panel 34r, 34g, 34b mentioned above, the air blowing from the three suction fans 41, 42, 43 is formed through the air ducts 411, 421, 431. The discharge ports r1 , r2 , g1 , g2 , b1 , and b2 are formed in the above-mentioned PBS 23 , and the discharge port p1 for discharging the blown air from the suction fan 43 through the air duct 432 is formed. In addition, an air guide duct is formed at the incident-side discharge port b1 and the exit-side discharge port b2 of the liquid crystal panel 34b corresponding to blue light to discharge the blown air from different suction fans 43 and 41 respectively. In addition, each suction fan 41-43 is comprised by the vortex fan.

That is, the air guide duct is configured as follows: one suction fan 43 is used to blow air to the incident side discharge port b1 of the liquid crystal panel 34b corresponding to blue light and the discharge port P1 of the PBS23, and the other two suction fans 41, 42 are used to blow air. Air is blown to the incident-side discharge ports r1, g1 and exit-side discharge ports r2, g2 of the liquid crystal panels 34r, 34g corresponding to red light and green light, and the exit-side discharge port b2 of the liquid crystal panel 34b corresponding to blue light.

More specifically, the air guide duct is configured such that one of the two air intake fans 41, 42 is used to discharge the air through the air guide duct 421 to the incident side g1 of the liquid crystal panel 34g corresponding to the green light. And the exit side discharge port g2 blows air, use another suction fan 41 to pass through the extended air duct 411 to the incident side discharge port r1 and the exit side discharge port r2 of the liquid crystal panel 34r corresponding to the red light and the corresponding to the blue light The exit side discharge port b2 of the liquid crystal panel 34b blows air.

With the configuration as described above, the incidence and emission sides of the respective liquid crystal panels 34r, 34g, and 34b and the PBS 23 can be cooled by the three suction fans 41 to 43 . Furthermore, the incident side and the outgoing side of the blue light, which require a large amount of cooling, can be sufficiently cooled by separate suction fans 43, 41, respectively. Thereby, even if it is high brightness and the amount of light per unit area increases, the output power (speed) of the suction fans 41 to 43 can not be increased too much, and the three suction fans 41 to 43 can be used to cool the liquid crystal disks 34r, 34g, 34b and Polarizing plates 36r, 36g, 36b, 37g, 37b, 38r, 38g, 38b and PBS23 realize low noise.

In addition, the air guide duct is configured such that air is blown to the incident side discharge port b1 of the liquid crystal panel 34b corresponding to blue light and the discharge port p1 of the PBS 23 with one suction fan 43, and the other two suction fans 41, 42 are used to blow air. Air is blown to the incident-side discharge ports r1, g1 and exit-side discharge ports r2, g2 of the liquid crystal panels 34r, 34g corresponding to red light and green light, and the exit-side discharge port b2 of the liquid crystal panel 34b corresponding to blue light, thereby, Like the optical system 13 of this embodiment, the blue-ray liquid crystal panel 34b is arranged on the side of the PBS 23, and the above functions and effects can be realized by the shortest air duct structure. In addition, the air intake fan 41 for red light with the least temperature rise can be used to blow air to the exit side discharge port b2 of the liquid crystal panel 34b corresponding to blue light. Have again, if the green light that temperature rises the most is not enough with 1 suction fan 42, also can also blow air from the suction fan 41 that red light is used.

And, like the present embodiment, the air duct is constituted so that, among the above-mentioned two air suction fans 41, 42, one air suction fan 42 is used to discharge the light from the incident side g1 of the liquid crystal panel 34g corresponding to the green light. and the exit side discharge port g2 to blow air, use another suction fan 41 to the incident side discharge port r1 and the exit side discharge port r2 of the liquid crystal disk 34r corresponding to the red light and the exit side discharge of the liquid crystal disk 34b corresponding to the blue light The outlet b2 supplies air, so that the above functions and effects can be realized without complicating the structure of the air duct.

As described above, according to this embodiment, since the above-mentioned optical component cooling mechanism is provided, the output power (rotational speed) of the fan does not increase too much even if the brightness is high and the amount of light per unit area increases, and cooling with three fans can be realized. A liquid crystal projector 1 in which a liquid crystal panel, a polarizing plate, and a PBS are reduced in noise.

Next, the power supply unit of this embodiment will be described.

As described above, conventionally, the noise suppression filter unit is generally provided on the circuit board of the power supply unit.

For projection-type image display devices such as liquid crystal projectors, it is required to simultaneously achieve high brightness due to high output power of the light source lamp, and miniaturization and cost reduction of the device. The light source lamp has high output power. Therefore, the power supply The output power of the unit must also be large.

However, in a model with a small output power, although the noise suppression filter part can be provided on the circuit board of the power supply unit as in the above-mentioned conventional technology, there is no problem, but if the output power becomes larger, there is a problem that the size cannot be reduced. The noise suppression filter section of the simplified linear filter (coil) will increase, resulting in a larger power supply unit.

Once the power supply unit becomes larger, it is necessary to increase the size of the fan cooling the power supply unit or to increase the output power (rotational speed), thereby reducing the cooling performance and increasing the noise. As a countermeasure, it is conceivable to separately install the noise suppression filter part, but the connection line is easy to introduce noise, and due to the increase in the use of linear filters, it is difficult to implement EMC (ElectroMagnetic Compatibility: Electromagnetic Compatibility) measures, and the cost increases.

Therefore, in the present embodiment, as described above, the noise suppression filter part 15 is separated from the power supply unit main body 14, and the separated noise suppression filter part 15 is arranged as close as possible to the back side of the case where the power socket 10 is provided. The position near the wall and the main body 14 of the power supply unit.

Specifically, the power supply unit main body 14 is arranged along the front side wall of the laterally wide case 2, and the noise suppression filter unit 15 is arranged along the back side wall at a position facing the power supply unit main body 14 on the back side wall.

With such a configuration, even if the output power of the light source lamp 19 is increased, since the power supply unit main body 14 can be miniaturized, cooling performance can be improved and noise reduction can be achieved. Furthermore, by minimizing the connecting wires, it is possible to improve EMC response efficiency (reduce the use of linear filters, etc.), and to reduce costs.

In addition, the noise suppression filter unit 15 is disposed near the side wall of the housing back where the power socket 10 is provided, so that there is no power cord on the side of the housing 2, so the above-mentioned role and effect.

Moreover, the power supply unit main body 14 is arranged along the front side wall of the horizontally wide type housing 2, and the noise suppression filter part 15 is arranged at a position facing the above-mentioned power supply unit main body 14 on the rear side wall. Arranging 15 along the back side wall can also minimize the connection line, therefore, the above-mentioned action and effect can be obtained without complicating the arrangement structure of each component in the housing 2.

As described above, according to this embodiment, by including the above-mentioned power supply unit, even if the output power of the light source lamp 19 is large, it is possible to realize a liquid crystal projector that reduces noise by improving the cooling performance and reduces the cost by improving the efficiency of EMC countermeasures, etc. Machine 1.

Furthermore, in the present embodiment, the housing 2 is horizontally wide. Although the power supply unit body 14 and the noise suppression filter part 15 are arranged in parallel along the front side wall and the back side wall respectively, the connecting wires can be minimized. In the case of a vertically long case that is long in the front-rear direction, the connection line cannot be minimized in the above-mentioned arrangement. Therefore, in such a case, if the noise suppression filter part is arranged in the front-rear direction, for example, the noise suppression filter part can be reduced. The device part is disposed near the back side wall of the casing and the main body of the power supply unit.

Next, the exhaust mechanism in this embodiment will be described.

Conventionally, two exhaust fans for exhausting exhaust from the light source lamp, the power supply unit, and the like to the outside have been installed side by side near the light source lamp.

As mentioned above, for projection-type image display devices such as liquid crystal projectors, high output power of light source lamps and miniaturization of the devices have been required simultaneously, and high-temperature exhaust gas will be discharged from high-power light source lamps. Therefore, The reduction of the exhaust gas temperature and the noise reduction of the exhaust fan are issues.

However, in the conventional technique described above, in order to reduce the noise of the side-by-side exhaust fans, it is necessary to form a space from the side wall of the casing, which hinders miniaturization. In addition, in order to reduce the exhaust temperature, it is considered to arrange the exhaust directions of the exhaust fans arranged side by side in an "eight" shape, so that the high-temperature exhaust from the light source lamp and the lower-temperature exhaust from the power supply unit, etc. Gas mixing, which also requires a corresponding space, is not conducive to miniaturization.

Therefore, in this embodiment, as shown in above-mentioned Fig. 3, Fig. 4 etc., the first exhaust fan 17 that mainly discharges the exhaust gas from the light source lamp 19 (light source lamp unit 12) to the outside and the first exhaust fan 17 that mainly The exhaust from the power supply unit body 14 is discharged to the second exhaust fan 18, and the end of the first exhaust fan 17 near the second exhaust fan 18 is moved inward, so that the first exhaust fan 17 It is arranged obliquely so that the exhaust direction thereof faces the exhaust side of the second exhaust fan 18 .

In addition, the above-mentioned first exhaust fan 17 is arranged obliquely with respect to the plurality of slit-shaped exhaust holes 8 formed on the side wall of the casing, and is arranged obliquely so that the exhaust gas from the exhaust holes 8 is discharged obliquely forward. .

As shown in Fig. 16 and Fig. 17, in order to form the above arrangement structure, the above-mentioned first exhaust fan 17 and the second exhaust fan 18 can be pre-fixed on the frame body 50 and unitized, if the exhaust fan unit 51 is installed on the The predetermined position of the lower box 2b of the casing 2 can easily realize the above-mentioned disposition structure. Furthermore, since the first exhaust fan 17 inhales the high-temperature exhaust from the light source lamp 19, as shown in Figure 17, the motor part in the center is covered with a cover 52 on the back side to protect the motor part from being emitted from the light source lamp. 19 The influence of high temperature exhaust air.

With the configuration as described above, the first exhaust fan 17 is inclined inward, so that size reduction is not hindered, and a space can be formed between the casing side wall and the first exhaust fan 1 to achieve noise reduction. In addition, the high-temperature exhaust gas from the light source lamp 19 is mixed with the relatively low-temperature exhaust gas from the power supply unit main body 14 to reduce the temperature of the exhaust gas.

In addition, the light source lamp becomes high temperature, and a space is provided between the lamp and the exhaust fan compared with the conventional technology, so the above-mentioned structure and effect can be easily realized.

In addition, the second exhaust fan 18 is mainly used to exhaust the exhaust from the power supply unit main body 14 to the outside, so it can also exhaust the power supply unit main body 14 whose temperature is not as high as that of the light source lamp 19 but is also important.

In addition, the first exhaust fan 17 that exhausts the exhaust from the light source lamp 19 to the outside is arranged obliquely with respect to the plurality of slit-shaped exhaust holes 8 formed on the side wall of the housing, thereby reducing the high temperature from the light source lamp 19. Exhaust gas is exhausted obliquely from the plurality of slit-shaped exhaust holes 8 , so that it is difficult to exhaust accordingly, and it is easy to mix with relatively low-temperature exhaust gas from the second exhaust fan 18 , thereby further reducing the exhaust gas temperature.

In addition, the first exhaust fan 17 that exhausts the exhaust from the light source lamp 19 to the outside is arranged obliquely so that the exhaust is exhausted obliquely forward from the exhaust hole 8 formed on the side wall of the housing, thereby preventing high-temperature The exhaust gas is discharged laterally where the operator and the like are located.

As described above, according to this embodiment, since the above-mentioned exhaust mechanism is provided, it is possible to reduce the noise of the exhaust fans 17 and 18, reduce the exhaust temperature, and realize a downsized liquid crystal projector 1 .

In addition, in this embodiment, the first exhaust fan 17 is inclined, but if there is a free space inside, the second exhaust fan 18 can be inclined in the opposite direction as above, and a certain effect can also be obtained.

The cooling method of the projector network card is described below.

Fig. 19-21 is the figure that uses fan 41 to cool the air guiding structure of IC on the network card. Fig. 22-24 is the figure that uses fan 42 to cool the air guiding structure of IC on the network card.

As shown in the figure, in a new type of projector, a wireless network card or a wired network card 800 can be configured, so that data transmission from an external network is more convenient. However, the network card 800 (especially the integrated circuit in the network card) will also generate heat during operation. If the heat cannot be dissipated effectively, it will reduce the performance of the network card itself and the projector, and even cause the projector to fail to work normally. Therefore, the heat dissipation problem of the network card must be solved.

For the cooling scheme of the network card 800, the general idea is to achieve the purpose of allowing all parts requiring cooling in this area to be qualified in terms of cooling through the reasonable distribution of the air volume of the fan near the prism optical parts, that is, for cooling the optical parts. In addition to cooling the optical components themselves, the fan 41 or 42 can also divide a part of the air volume to cool the network card 800 . Specific protocols may include cooling protocols as described below.

A preferred solution is that, in addition to distributing part of the wind to the blue optical component, the fan 42 for cooling the red optical component can also pass through the air duct 421 corresponding to the fan 42 for cooling the red optical component in the cooling air duct. A branch air duct 422 leading to the network card 800 is provided to distribute a part of the air volume to the network card 800 for cooling the network card 800 , especially the integrated circuit in the network card 800 with relatively high operating temperature.

As one of the alternatives, in addition to cooling the fan 41 of the green optical component itself, it is also possible to set a branch air duct 412 leading to the network card 800 on the corresponding air duct 411 of the cooling air channel, and to adjust the air volume of the fan. Reasonably designed, part of the air volume is distributed to the network card 800 for cooling the network card 800, especially the integrated circuits in the network card 800 with relatively high operating temperature.

In this way, the operating temperature can also meet the requirements by using the fan cooling method of the network card 800 without using heat dissipation glue on the integrated circuit of the network card 800 .

The overall design of the cooling air passage is further described in detail below.

As shown in the figure, for a projector with high illumination and small size (for example, a projector with 3000 lumen illumination and a 0.63-inch liquid crystal panel), the operating temperature of various optical components is high, and effective cooling is required. Among the optical components near the prism, the red optical components are easier to cool than the green optical components, and the blue optical components are the most difficult to cool. Therefore, in order to meet the cooling requirements, the structure of the cooling air duct can be reasonably designed to control the air volume provided by the three fans to the red, green and blue optical components.

Since red is easy to cool, the corresponding air duct 411 in the cooling air duct is configured so that the fan 41 can cool the red polarizer with a part of the air volume in addition to cooling the red prism optical components. The fan 42 only cools the green polarizer. The blue optical components are jointly cooled by the fan 41 and the fan 43, and a part of the air volume of the blue optical components can be distributed to the PBS. In this way, the purpose of cooling all optical components with three fans is achieved. In order to obtain the best cooling effect, the optimal air volume distribution and the most reasonable air duct shape were found through experiments.

Specifically, one end of the air duct 411 communicates with the fan 41 , and the other end is provided with outlets r1 and r2 , and the outlets r1 and r2 are used to supply air to the liquid crystal panel 34r. The air guide pipe 421 of the cooling air passage is connected with the fan 42, and is provided with outlets g1, g2, and the outlets g1, g2 are used for supplying air to the liquid crystal panel 34g. The air guide pipe 431 of the cooling air channel communicates with the fan 43 at one end, and is provided with a discharge port b1, and the discharge port b1 is used for supplying air to the liquid crystal panel 34b.

In addition, the air duct 411 can also be configured to send a part of the air volume from the fan 41 to the outlet b2. Moreover, the air guide pipe 431 can also be provided with a branch air guide pipe 432, and the branch air guide pipe 432 is also connected with the fan 43 at one end, but is provided with a discharge port p1 for cooling the PBS at the other end.

The overall arrangement of the fan for reducing the temperature inside the projector according to the present invention will be further described in detail below.

As shown in FIG. 18, the direction of the arrow in FIG. 18 represents the direction of air flow. Specifically, the fans 41, 42, 43 suck cold air from the outside of the projector, and the cold air cools optical components such as the liquid crystal panel and becomes hot air with elevated temperature, and the hot air accumulates near the liquid crystal panel. However, since the heat generated by the optical components during operation is much lower than that of the light source, the temperature of this hot air is still relatively low relative to the cooling of the light source, and it can be further used to cool the light source. Therefore, as mentioned above, a fan 16 can be provided, and the fan 16 will inhale the hot air accumulated near optical components such as liquid crystal discs to cool the light source bulb, and the temperature of the light source bulb after cooling the light source bulb will be cooled by the exhaust fan 17. The raised air is exhausted outside the projector, thereby improving the air flow inside the projector and reducing the temperature inside the projector. In Fig. 18, an air guide wall 500 is provided on the inlet side of the fan 16, which can be used to efficiently suck the heated air into the fan 16 after cooling the prism optical components, and send it to the lamp tube. Deliver cooling air.

In addition, in the above-mentioned embodiments, a liquid crystal projector in which a liquid crystal panel is used as a light modulation element is exemplified as a projection-type image display device, but the present invention can also be applied to a projection-type image display device having another image light generation system. For example, a projector in the form of DLP (Digital Light Processing; registered trademark of Texas Instruments (TI) Inc.) is also applicable to the present invention.

Claims (6)

1. cooling means that is used for projector's network interface card, described method comprises:

Be provided for cooling off the cooling air channel of described projector optical parts, described optics comprises redness, green and blue optical parts, and described cooling air channel comprises red optics guide duct, green optics guide duct and the blue optical parts guide duct that is respectively applied for cooling described redness, green and blue optical parts;

It is characterized in that,

Network interface card is provided, and described network interface card is arranged in the described projector, and has integrated circuit;

In described cooling air channel, be provided with and lead to branch's guide duct of described network interface card integrated circuit, give described integrated circuit so that tell a part of air quantity.

2. method according to claim 1 is characterized in that, is provided for cooling off branch's guide duct of described network interface card integrated circuit on described red optics guide duct.

3. method according to claim 1 is characterized in that, is provided for cooling off branch's guide duct of described network interface card integrated circuit on described green optics guide duct.

4. method according to claim 1 is characterized in that, described network interface card is arranged to be adjacent to the cooling air channel of described optics.

5. method according to claim 1 is characterized in that, described network interface card is arranged near the sidewall of the described projector the described optics cooling air channel.

6. a projector comprises housing, power supply unit, light source cell, optical system, fan component and network interface card, it is characterized in that, described projector has adopted according to each described network card cooling method in the above claim.

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