CN1228682C - Heat dissipation structure of the projector - Google Patents

Abstract

The invention relates to a heat radiation structure of a projector, which comprises a light source; an exhaust fan located near the light source and including an air inlet; a circuit fan, which is arranged near the exhaust fan and is provided with an air inlet; an air suction fan having an air outlet; a guide air duct having an inlet at the air outlet of the suction fan; the outlet of the light source extends to one side of the front end of the light source; and the exhaust air duct is provided with an inlet positioned at the other side of the front end of the light source relative to the outlet of the guide air duct, and the outlet extends to form a branch guide passage which is respectively communicated with and covers the air outlets of part of the exhaust fan and the circuit fan. The optical system is separated from the circuit system by a partition board in the shell of the projector, the circuit system is cooled by a circuit fan, the optical system guides partial air flow by a guide air channel, the air flow is blown into the lamp shell, and then is guided by an exhaust air channel through a branch guide channel, an outlet at one end flows to the exhaust fan, an outlet at the other end flows to the circuit fan, and hot air flows are exhausted by the two fans.

Description

Heat dissipation structure of the projector

Technical field

The invention relates to a projector, in particular to a heat dissipation structure of the projector.

Background technique

With the vigorous development of optoelectronic technology, in order to project high-brightness and clear images on the screen to provide users with a comfortable viewing effect, general projection display devices often use high-power bulbs as the light source of the projector lighting system. However, high-power bulbs can produce high-temperature heat dissipation problems. In order to cool the temperature of high-power bulbs, although the prior art uses cooling fans as cooling, because the temperature of the bulbs is too high, the working temperature of the cooling fans will be increased, such as increasing the fan speed or increasing the temperature. Fans, can create noise issues. Therefore, how to effectively dissipate heat and reduce noise has become an important research topic for those skilled in the art.

Please refer to Fig. 1, it is the optical system of existing projector, mainly comprises an illumination system 10 and an imaging system 20, and illumination system 10 produces an illumination beam by light source 11, and this illumination beam irradiates on lens array 12 (lens array), The lens array 12 is composed of many small lenses, which can make the brightness of the illumination beam uniform, and then concentrate the light through an illumination lens group 13 and enter the imaging system 20 . The imaging system 20 divides the illumination beam into red light and other visible light by the first beam splitter 21, the red light is reflected by the first beam splitter 21, enters the first reflector 211, and then reflects through the optical retardation film, liquid crystal display and polarizer, etc. The formed first lens group 212 is incident on the X-prism 24, and other visible light directly passes through the first beam splitter 21, irradiates on the second beam splitter 22, and is split into blue light and green light, wherein the blue light passes through the second beam splitter 22 reflection, through the second lens group 221 composed of optical retardation film, liquid crystal display and polarizer, etc., and incident on the X-prism 24, and the green light directly passes through the second beam splitter 22, passes through the third reflector 222 and The fourth reflecting mirror 223 passes through the third lens group 224 composed of optical retardation film, liquid crystal display and polarizer, and is incident on the X-prism 24. Finally, the red, blue and green light is combined by the X-prism 24 and then incident on the projection The lens 25 is then projected onto a screen (not shown).

As shown in Figure 2, since the lighting system 10 uses a high-power light bulb as a projection lighting source, in addition to the high-heat bulb of the light source 11 that needs to be cooled, the optical system components irradiated by the light beam will increase in temperature due to receiving heat. High temperature affects the working characteristics of the optical components and shortens the lifespan. In the conventional projector, a main fan 31 is provided on the casing 30 behind the light source 11 to cool the optical components of the imaging system 20 and the lighting system 10 . In addition, in order to prevent the high-temperature optical system from affecting the circuit system 35 , the existing projector uses a partition plate 36 to roughly isolate the circuit system 35 from the optical system, and uses a circuit fan 37 to cool the circuit system 35 separately. In addition, in order to fully cool the high-heat lamp post 112 (burner) inside the lamp housing 111, a secondary fan 32 is provided on the partition plate 36 near the light source 11, and a part of the air flow is sucked in by the circuit system 35, as shown by the direction of the arrow. Guided by an air duct 33, the inhaled air flow is blown into the interior of the lamp housing 111 from the front end side of the lamp housing 111 to cool the radiant heat received by the lamp post 112 and the inner surface of the lamp housing 111 that actually generate high heat, and then It flows out from the other side of the front end of the lamp housing 111 and is discharged out of the housing 30 by the main fan 31 .

The aforementioned existing projector only uses a single main fan 31 to discharge the heat of the optical system and part of the circuit system 35 out of the casing 30, so that the main fan 31 bears high operating temperature, which will reduce the life of the fan. Although the operating temperature can be reduced and the heat dissipation efficiency can be improved by increasing the fan speed and number. However, both of these two methods will increase the cost and increase the noise, and the difficulty of system control will also increase, and the reliability of the system will decrease accordingly, thereby affecting the quality of the product.

Contents of the invention

The object of the present invention is to provide a heat dissipation structure of a projector, in which the whole fan shares the heat load evenly, improves the cooling efficiency, reduces the working temperature of the main fan, prolongs the service life of the fan, and improves the product quality.

The purpose of the present invention is achieved by providing a heat dissipation structure of a projector, the projector includes a light source, a circuit system and an optical system, the heat dissipation structure includes: an exhaust fan, located near the light source, and Contains an air inlet; a circuit fan, located near the exhaust fan, has an air inlet for cooling the circuit system; an air suction fan has an air outlet for cooling the optical system; a guide wind A channel with an inlet located at the air outlet of the suction fan, an outlet extending to one side of the front end of the light source; and an exhaust air channel with an inlet located at the other side of the front end of the light source relative to the outlet of the guide air channel, The outlet is extended to form a divergent approach leading to and covering the air outlets of part of the exhaust fan and the circuit fan respectively.

Preferably, the present invention roughly separates the optical system and the circuit system with a partition in the casing of the projector, and cools the circuit system with a circuit fan, and the optical system is blown out by the air guide duct guiding the suction fan. Part of the air flow of the lamp housing is blown into the interior of the lamp housing by the front end side of the lamp housing, and then guided by the exhaust air duct on the other side of the lamp housing. The outlet of the other end of the fan flows to the circuit fan, and the two fans discharge the hot air out of the casing to evenly bear the heat of the lamp casing.

Description of drawings

FIG. 1 is a schematic configuration diagram of an existing projector optical system;

FIG. 2 is a schematic diagram of a heat dissipation structure of an existing projector;

3 is a configuration diagram of a heat dissipation structure of a projector according to an embodiment of the present invention;

FIG. 4 is a configuration diagram of a heat dissipation structure of a projector according to another embodiment of the present invention.

Detailed ways

In order to achieve the above object, the present invention adopts technical means and its effects, two preferred embodiments are given, and are described as follows in conjunction with the drawings. Please refer to FIG. 3 , which shows the heat dissipation structure of the projector according to the first embodiment of the present invention, wherein the casing 40 of the projector mainly includes an optical system 50 and a circuit system 60 , and a partition 401 roughly separates the two systems. Separated, the side close to the circuit system 60 is cooled by the circuit fan 43 located on the casing 40, and the side of the optical system 50 is provided with an air suction fan 41 and an exhaust fan 42 on the casing 40, and a wind blower. The channels 44 and 45 are used to dissipate heat to maintain an appropriate working temperature inside the projector.

Wherein, the optical system 50 includes an illumination system 51 and an imaging system 52. The lens 521 of the imaging system 52 protrudes from the side of the casing 40 of the projector. On the casing 40 near the lens 521, an air suction fan 41 is set to suck in air , to cool the components of the imaging system 52 and the lighting system 51, and the casing 40 behind the light source 511 is provided with an exhaust fan 42, which will cool the air of the imaging system 52 and suck the components of the lighting system 51 and the high-temperature light source 511 , and finally cool the outside of the lamp housing 512 of the light source 511 and discharge it out of the housing 40 . In addition, a guide air duct 44 is provided at the air outlet 411 of the suction fan 41, and the inlet 441 of the guide air duct 44 is aligned with and covers the air outlet 411 of the part suction fan 41, and the guide air duct 44 is formed by the suction fan. The air outlet 411 of 41 extends to the front end of the lamp housing 512, and its outlet 442 is aligned with one side of the front end of the lamp housing 512, and the outlet 442 is properly guided to the lamp post 513 inside the lamp housing 512.

In addition, on the side opposite to the front end of the lamp housing 512, there is another exhaust air duct 45, the inlet of which is close to the front end of the lamp housing 512, and the exhaust air duct 45 extends along the partition 401 to the rear side of the light source, forming a branch at last. In the approach 452, the outlet 4521 at one end extends to the exhaust fan 42, and the outlet 4522 at the other end extends the partition 401 to the circuit fan 43. The two outlets 4521 and 4522 are only aligned with and cover part of the air inlet of the exhaust fan 42 and the circuit fan 43. 421, 431, forming a heat dissipation guide air duct.

The first embodiment of the present invention is based on the configuration of the aforementioned fan and air duct, as shown in the direction of the arrow, the part of the air flow blown out by the air suction fan 41 is guided by the guide air duct 44, and the air flow is directed by the front end side of the lamp housing 512. Blow into the interior of the lamp housing 512 to cool the high-heat lamp post 513 and the directly heated internal reflection surface of the lamp housing 512. The air duct 45 guides, and through the diverging guideway 452, the outlet 4521 at one end flows to the exhaust fan 42, and the outlet 4522 at the other end flows to the circuit fan 43, and the two fans discharge the hot air flow out of the projector casing 40, which not only makes the The two fans equally bear the heat in the lamp housing 512, and prevent the exhaust fan 42, which has been subjected to the heat load of the optical system, from working too high. In addition, since the air suction fan 41 directly sucks in air close to the natural temperature from the outside of the casing 40, it not only effectively cools the optical system, but also improves the internal cooling efficiency of the light source 511; The cross-sectional area occupied only accounts for a small part of the air suction fan 41, the exhaust air duct 42 and the circuit fan 43, which has no great influence on the original heat dissipation load, so the fans can still maintain most of the original The cooling function can maintain the proper working temperature inside the projector.

As shown in Table 1, it is the comparison of the measured data before and after the improvement of the first embodiment of the present invention. With the illumination light source 511 using a 130W bulb as the test standard, the actual measurement of the fan outlet temperature, the outlet temperature of the exhaust fan 42 before the improvement is about 85°C, the outlet temperature of the circuit fan 43 is about 55°C, after improvement, the outlet temperature of the exhaust fan 42 is reduced to about 70°C, a decrease of 15°C, and the outlet temperature of the circuit fan 43 is increased to about 65°C, an increase of 10°C . Therefore, while maintaining an appropriate working temperature inside the projector, the circuit fan 43 is allowed to share part of the temperature load, so that the temperature load of the exhaust fan 42 is reduced to the specified operating range (below about 90° C.), although the circuit fan 43 raises the temperature Load, but still within the specified operating temperature range (below about 70°C), which can increase the life of the exhaust fan and avoid increasing fan noise.

As shown in Figure 4, it is the second embodiment of the present invention, the basic structure is similar to the first embodiment, and also includes an optical system 50 and a circuit system 60 in the casing 40 of the projector, and the two systems are connected by a partition 401. Roughly separated, the side close to the circuit system 60 is cooled by the circuit fan 43 provided on the casing 40, and the side of the optical system 50 is provided with an air suction fan 41A, an exhaust fan 42, and an air duct 44 , 45 for heat dissipation. The main difference is that the air suction fan 41A of the second embodiment sucks and cools the air flow of the imaging system 52, and is guided through the air guide channel 44 through the air outlet 411A, and the air flow is blown in from the front end side of the lamp housing 512. The inside of the lamp housing 512 is cooled, and then guided by the exhaust air duct 45 on the other side of the lamp housing 512, through the branch guide duct 452, the outlet 4521 at one end flows to the exhaust fan 42, and the outlet 4522 at the other end flows to the circuit fan 43 , so that the two fans evenly bear the heat in the lamp housing 512 to prevent the exhaust fan 42 from working at too high a temperature. Therefore, the suction fan 41A sucks the air flow, which improves the cooling efficiency of the imaging system 52 , and achieves the purpose of the present invention to make the heat load of the whole fan average, so as to improve the life of the fan.

Table 1 Projector lighting source: 130w bulb before improvement Improved increase or decrease temperature exhaust fan 80°C 70°C -15°C circuit fan 55°C 65°C +10°C

In the same way, the fan operation of the overall planning projector of the present invention, the average heat load of the fan, wherein the imaging system 52 is not limited to the existing transmissive liquid crystal system mentioned in the relevant technical description, but also applicable to the reflective liquid crystal system or digital Microlens systems and other heat dissipation structures with similar light sources; in addition, although the fans in the embodiment of the present invention are all arranged on the side of the casing 40, based on the air duct structure technology of the present invention to equally share the load of each fan, it is also possible to properly install each fan. Set on all sides of the projector.

What has been described above is only a preferred embodiment for conveniently illustrating the present invention, and the scope of the present invention is not limited to the preferred embodiment. Belong to the protection scope of the claims of the present invention.

Claims (8)

1. A heat dissipation structure of a projector, the projector comprising a light source, a circuit system and an optical system, the heat dissipation structure comprising: An exhaust fan is located near the light source and includes an air inlet; A circuit fan, located near the exhaust fan, has an air inlet for cooling the circuit system; A suction fan has an air outlet for cooling the optical system; a guiding air duct, with an inlet located at the air outlet of the suction fan, and an outlet extending to one side of the front end of the light source; and An exhaust air duct has an inlet located on the other side of the front end of the light source relative to the outlet of the guiding air duct, and its outlet is extended to form a divergent guide duct, leading to and covering the air outlets of part of the exhaust fan and the circuit fan respectively . 2. The heat dissipation structure of a projector as claimed in claim 1, wherein the exhaust fan is located behind the light source. 3. The heat dissipation structure of a projector as claimed in claim 1, wherein the projector further comprises an imaging system, and the suction fan is used to cool the imaging system. 4. The heat dissipation structure of the projector according to claim 3, wherein the suction fan sucks in air from the outside of the projector, and the inlet of the guiding air duct covers part of the air outlet of the suction fan. 5. The heat dissipation structure of the projector as claimed in claim 3, wherein the air suction fan sucks in air from the imaging system, and the inlet of the guiding air duct covers the air outlet of the air suction fan. 6. The heat dissipation structure of a projector as claimed in claim 1, wherein the light source has a lamp housing, and a lamp post is arranged inside the lamp housing. 7. The heat dissipation structure of the projector as claimed in claim 6, wherein the outlet of the guiding air channel guides the air flow to be blown into the lamp housing. 8 . The heat dissipation structure of a projector as claimed in claim 1 , wherein the projector separates the optical system by a partition to form an independent area of the circuit system for isolation from the optical system.

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