JP2012189836A - Projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unpleasantness to a user by decreasing the temperature of exhaust air before the exhaust air reaches an exhaust port with a simple configuration, thereby suppressing the rise of the temperature of a device exterior.SOLUTION: A part of a flow path for exhausting lamp heat comprises a heat conduction member and the heat conduction member is used also as a part of the other exhaust air flow path, so that the lamp heat can be heat transported through the heat conduction member, to decrease the temperature of the exhaust air whose temperature is locally high.

Description

  The present invention relates to a heat exhaust structure in a high temperature part such as a light source in a projection apparatus such as a projector.

  Conventionally, for example, in a projection device such as a projector, image information is added to light emitted from a light source from an image display element and projected onto an external screen. In general, such a projector is equipped with a light source such as a high-pressure mercury lamp that is heated. This light source is one of the important components that determine the brightness of the projection screen, and in recent years, in particular, there is a tendency to employ a high-power lamp in order to obtain a high-luminance image.

  When the lamp output increases, the amount of heat generated from the lamp increases in proportion to this, and this may affect the components that make up the interior of the device. It is. In this case, since the wind after cooling the lamp becomes high temperature, the temperature of the exhaust air exhausted from the apparatus becomes high. As a result, there is a possibility that the user may feel uncomfortable in a situation where the vicinity of the wound surface of the device where the exhaust port is provided becomes hot or the exhaust air that has become hot touches the user.

  Thus, as disclosed in Patent Document 1, it has been known that the exhaust temperature can be reduced by using a metal wind guide plate. However, if this guide plate is simply made of metal, it can only absorb heat for the heat capacity of the sheet metal, and after reaching thermal equilibrium, it will not absorb heat, and as a result, a reduction in exhaust temperature cannot be expected so much.

  Further, in the method disclosed in Patent Document 2, since it is necessary to take in air with a fan more than the amount of air that should be cooled, the fan noise may be increased.

  Moreover, as disclosed in Patent Document 3, by crossing the blowing directions of the two exhaust fans, the two exhaust air is mixed and exhausted, thereby relieving the local high temperature portion of the lamp exhaust heat. As a result, it is known to reduce the exhaust temperature. However, the configuration in which this configuration can be adopted is not limited to a small projector in which two fans can be arranged adjacent to each other, but also requires a space for mixing two winds, leading to an increase in the size of the apparatus. Further, since the temperature is not reduced on the intake surface of the fan that exhausts the lamp heat, there is a possibility that the life of the fan may be reduced.

  Moreover, in the method described in Patent Document 4, there is a concern that the construction is large and the cost is increased and the size of the apparatus is increased.

JP 2004-170541 A JP 2007-171391 A JP 2008-52272 A JP 2007-322950 A

  As described above, there is a problem in that the exhaust temperature cannot be reduced efficiently without sacrificing the size, noise and cost of the apparatus.

  Accordingly, the object of the present invention is to solve such problems, reduce the temperature of the exhaust air until it reaches the exhaust port with a simple configuration, and suppress the temperature rise of the exterior of the device, thereby preventing inconvenience to the user. The object is to provide a projector with reduced pleasure. Another object of the present invention is to provide a projector that reduces the discomfort by reducing the exhaust temperature, even if exhaust air is blown to the user side.

  To achieve the above object, in a projection apparatus having a first fan that exhausts heat from a lamp, a second fan that exhausts heat other than the lamp, and an exhaust duct that leads from the lamp to the first fan, At least a part of the duct is formed of a heat conductive member (for example, a sheet metal). A part of the heat conducting member is arranged to constitute a part of the air path of the second exhaust fan.

  According to the projection device of the present invention, the exhaust air heated to a high temperature by the first fan cooling the lamp is absorbed by the heat conducting member constituting the duct, so that the exhaust temperature can be reduced. Furthermore, the amount of heat absorbed by the heat conducting member is transported by heat conduction through the heat conducting member and is transported to the air path of the second fan, and is exhausted to the outside of the apparatus by the second fan.

  In other words, the amount of heat cooled by the first fan is always exhausted from the second fan to the outside, so that the heat absorption effect from the lamp heat to the heat conducting member is not significantly reduced, and the entire projector usage time is reached. Exhaust temperature can be reduced across.

  As a result, the exhaust temperature exhausted from the first fan is reduced, and the exhaust temperature exhausted from the second fan is increased. Therefore, the exhaust temperature is made uniform, and the maximum temperature of the exhaust air can be reduced, so that a projector with reduced user discomfort can be provided.

Schematic diagram for explaining the present invention Main view for explaining the present invention The figure which shows the whole airflow of this invention Overall configuration diagram of the present invention

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[Example 1]
FIG. 4 shows the overall configuration of the projector of the present invention.

  In FIG. 4, 1 is a lamp, 2 is a lamp house including the lamp 1, 3 is an optical engine unit that projects image information added to the light emitted from the lamp 1, and 4 is an axis that cools the entire lamp house 2. A lamp exhaust fan, which is a flow fan, 5 is an overall exhaust fan for exhausting the air of the entire apparatus such as substrates disposed inside the apparatus, 6 is a lamp heat exhaust port provided on the exterior, and 7 is an entire An overall heat exhaust port 8 for discharging the wind from the exhaust fan to the outside of the apparatus, and 8 constitutes a part of a flow path from the lamp exhaust fan 4 to the lamp heat exhaust port, and holds an electric substrate disposed inside the apparatus. Indicates sheet metal.

  The optical engine unit 3 has a substantially L-shaped configuration in which light emitted from the lamp 1 is turned back using a total reflection mirror. Further, a color separation / synthesis optical system 9 for separating the guided light by color and adding image information to synthesize the light is disposed at 9. An image display element (not shown) included in the color separation / synthesis optical system 9 is connected to the display element driving substrate 10 adjacent to the color separation / synthesis optical system 9 to add image information intended by the user to light. can do.

  These are included by an exterior (not shown) composed of a plurality of parts, and constitute a projector.

  Next, FIG. 3 shows the airflow of the projector of the present invention.

  In the configuration of the present invention, three types of flow paths are roughly divided. The first flow path A is sucked into the inside of the apparatus from the intake port 11 provided on the front surface of the apparatus and blown into the lamp house 2 by the lamp exhaust fan 4, and then passes through the exhaust duct 13 to the lamp heat exhaust port 6. This is a flow path (indicated by a solid line arrow) that is further exhausted.

  The second flow path enters the inside of the apparatus through the air inlet 11, is sucked into the lamp cooling fan 12 that cools the inside of the lamp reflector (not shown), and is blown into the lamp reflector. This is a flow path (indicated by a one-dot chain line) that joins the first flow path A and is exhausted from the lamp heat exhaust port 6.

  The third flow path C is sucked into the apparatus through an intake port 11 provided in the front of the apparatus, and is sent to the color separation / combination system 9 by a sirocco fan (not shown) to constitute the color separation / combination optical system 9. After cooling the optical element, the image display element, and the display element driving substrate 10, there is a flow path C (indicated by a broken line arrow) that is exhausted from the general exhaust port 7 by the general exhaust fan 5.

  Here, the lamp exhaust fan 4 is arranged on the windward side of the lamp house 2 so that the lamp 4 does not receive the lamp heat directly, so that the fan life is not reduced. Further, since it is desirable that the whole exhaust fan 5 is sucked from a wide range of the apparatus, the fan 5 is arranged on the leeward side of the heating element. Further, in order to efficiently exhaust the air that has cooled the color separation / combination optical system 9, in the substantially L-shaped optical layout as shown in FIG. 3, the side surface near the side opposite to the side where the lamp is disposed. It is desirable to be arranged. Therefore, the lamp exhaust fan 4 and the general exhaust fan 5 are not adjacent to each other and are arranged with a certain distance.

  In addition, since the amount of heat generated from the lamp 1 is much larger than that of other heating elements (electrical elements and optical components), it is a well-known fact that the temperature in other areas is lower than that around the lamp, In general, the temperature distribution in the apparatus is such that the temperature around the lamp becomes high.

  Here, the airflow around the lamp house will be described in detail with reference to FIGS. 1 and 2. The wind blown from the lamp exhaust fan 4 is separated into the wind W1 blown inside the lamp house and the wind W2 flowing in the upper part of the lamp house in FIGS. The wind blown from the lamp cooling fan 12 is mixed with the wind W3 blown into the lamp reflector 1R in the space (exhaust duct 13) until it reaches the lamp heat exhaust port 6, and the lamp heat exhaust port 6 is mixed. More exhausted.

  In such a configuration, a part of the exhaust duct which is a flow path from the lamp exhaust fan 4 to the lamp heat exhaust port 6 is configured by the substrate holding metal plate 8. By doing so, heat can be absorbed by the substrate holding sheet metal from the high-temperature wind after cooling the lamp 1. Since the absorbed heat works to maintain thermal equilibrium, it diffuses while conducting heat through the substrate holding metal plate 8 (the heat flow is indicated by H1 and H2 in FIG. 1). At this time, as shown in FIG. 1, the substrate holding metal plate 8 forms part of the air path C of the entire exhaust fan, so that the heat H1 and H2 transported by the heat are again blown by the entire exhaust fan 5. Heat is transferred and discharged from the entire exhaust port 7 to the outside of the apparatus. Therefore, since the amount of heat exhausted from the lamp heat exhaust port 6 can be reduced, local high temperature on the exhaust surface can be prevented, and discomfort to the user can be reduced.

  Moreover, in order to raise the efficiency of the heat absorption to a heat conductive member more, as shown in FIG. Compared to the case where the sheet metal is arranged in parallel to the flow, the turbulent flow component generated by the collision of the flow destroys the temperature boundary layer formed in the vicinity of the sheet metal when arranged vertically. Heat exchange between the flow and the sheet metal is facilitated. Therefore, since the amount of heat exhausted from the lamp heat exhaust port can be further reduced, local high temperature on the exhaust surface can be prevented, and discomfort to the user can be reduced.

  (FIG. 2 shows a configuration in which the substrate holding sheet metal 8 is sprayed in a substantially vertical direction (W3 ′), but the present invention does not limit the angle with respect to the substrate holding sheet metal).

  Further, in order to further improve the heat dissipation efficiency from the heat conducting member to the exhaust air, as shown in FIG. 1, a part 8a of the substrate holding sheet metal is arranged substantially perpendicular to the suction direction of the whole exhaust fan 5, A shape having a plurality of openings such as punching metal. In such a configuration, compared to the case where the sheet metal is arranged in parallel to the flow, the turbulent flow component generated by the collision of the flow destroys the temperature boundary layer formed in the vicinity of the sheet metal, Heat exchange between the flow and the sheet metal is facilitated. As a result, since the amount of heat exhausted from the lamp heat exhaust port can be further reduced, local high temperature on the exhaust surface can be prevented, and discomfort to the user can be reduced.

  Further, in the present invention, the configuration using the substrate holding sheet metal 8 as the means for transporting the heat quantity of the lamp 1 to the entire exhaust fan 5 has been described, but the present invention is not limited to this configuration. However, it is a well-known fact that, from the viewpoint of EMI characteristics, it is desirable to place a sheet metal that is opposed to the electric substrate and includes the substrate area (larger than the substrate area) and is grounded. Therefore, in the present invention, efficient heat transport is realized by using the substrate holding sheet metal 8 having a large area and high thermal conductivity as a part of the exhaust duct. However, the present invention is not limited to sheet metal as a means for heat transport, and for example, a resin member having high thermal conductivity can be substituted.

  In this way, by performing heat transport to the vicinity of the exhaust fan other than the lamp exhaust fan using the heat conduction in the sheet metal (heat conducting member), the exhaust heat is dispersed and the local exhaust temperature is increased. High temperature of the exhaust port member can be prevented.

  The present invention can be applied to an optical apparatus using a light source that becomes a high temperature such as a high-pressure mercury lamp, for example, a projector.

DESCRIPTION OF SYMBOLS 1 Lamp 1R Lamp reflector 2 Lamp house 3 Optical engine unit 4 Lamp exhaust fan 5 Whole exhaust fan 6 Lamp heat exhaust port 7 Whole exhaust port 8, 8a Substrate holding sheet metal 9 Color separation optical system 10 Image display element drive board 11 Intake port 12 Lamp cooling fan 13 Exhaust ducts A, B, C Flow paths W1, W2, W3, W3 ′ Air flow H1, H2 Heat transfer in flow path A

Claims (4)

A light source as a first heat source;
A second heat source that generates less heat than the first heat source; and
A first exhaust fan that exhausts heat generated by the first heat source;
A second exhaust fan for exhausting heat generated by the second heat source;
An exhaust duct leading from the first heat source to the first fan;
In a projection apparatus having
At least a part of the exhaust duct is composed of a heat conducting member,
The projection apparatus according to claim 1, wherein a part of the heat conducting member is arranged to constitute a part of an air path of the second exhaust fan. The projection apparatus according to claim 1, wherein the first-stage heat conduction member is a sheet metal that also serves as a shield for an electric substrate disposed inside the projection apparatus. The light source is included in a light source house that covers the periphery of the light source,
The wind that cools the light source is at least a first air path that cools the arc tube, a second air path that is guided in the light source house,
The projection apparatus according to claim 1, wherein a third air path that guides the outside of the light source house is configured, and the first air path blows in a direction perpendicular to the sheet metal. A part of the sheet metal disposed in an air passage of the fan has a surface perpendicular to an intake direction of the fan, and a plurality of openings are provided in the vertical surface. The projection device according to any one of claims 1 to 3.