JP2017009645A - Cooling device and image projection device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device and image projection device that can improve a cooling effect with respect to a heating source.SOLUTION: In a cooling device including cooling means such as a suction fan 61 that cools a heating source such as a power source unit 51; and control means such as a fan control unit 104 that controls the cooling means, the cooling device comprises: location information acquisition means such as a GPS reception processing unit 101 that acquires location information on an installation site of a heating source; and storage means such as a database 103 that stores a rating power source voltage and altitude information corresponding to the location information. The control means is configured to control the cooling means corresponding to the rating power source voltage and the altitude information obtained with reference to the storage means on the basis of the location information acquired by the location information acquisition means.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a cooling device and an image projection device including the cooling device.

  Conventionally, in an electronic apparatus such as an image projection apparatus having a light source as a heat source, a cooling device for cooling the heat source is known.

  Patent Document 1 discloses a cooling fan that obtains position information of an installation location of an image projection apparatus by receiving radio waves from a satellite and air-cools a light source as a heat source according to an altitude calculated based on the position information. An image projection apparatus including a cooling device that controls the number of rotations is described. In the cooling device of this image projection device, when the installation location of the image projection device is a high place where the atmospheric pressure is low, the rotational speed of the cooling fan is lowered. On the other hand, when the altitude of the installation location of the image projection apparatus is low, the number of rotations of the cooling fan is increased. By these, it is said that the cooling effect without excess and deficiency according to the difference of the altitude of an installation place is acquired.

  Patent Document 2 discloses an image projection apparatus including a cooling device that detects a rated power supply voltage input to a power supply and controls the number of revolutions of a cooling fan that cools the power supply of a heat source based on the rated power supply voltage. Is described. In this image projector cooling device, the rated power supply voltage differs depending on the country or region, and the heat generation amount of the heat source is different.Therefore, when the detected rated power supply voltage becomes low, control is performed to increase the rotation speed of the cooling fan. Increase the cooling effect, which is insufficient. On the other hand, when the rated power supply voltage becomes high, control is performed to reduce the rotational speed of the cooling fan, thereby reducing the excessive cooling effect. By these, it is supposed that the cooling effect without excess and deficiency according to the difference of a rated power supply voltage can be acquired.

  According to the cooling device of the image projection apparatus disclosed in Patent Document 1, if the heat generation amount of the heat source is different due to the difference in the rated power supply voltage for each country or region, the altitude based on the position information obtained from the radio wave from the satellite is increased. Accordingly, the optimum number of rotations of the cooling fan cannot be controlled only by controlling the number of rotations of the cooling fan. On the other hand, a circuit that detects the rated power supply voltage input to the power supply when the rotation speed of the cooling fan is optimally controlled according to the difference in the rated power supply voltage at the installation location, as in the cooling device disclosed in Patent Document 2. Is required. If the detection circuit is provided in the cooling device of Patent Document 1, the rotational speed of the cooling fan can be optimally controlled even when the rated power supply voltage is different. However, since the detection circuit is provided, the cost is increased.

  In order to solve the above-mentioned problem, the invention of claim 1 is a cooling device comprising a cooling means for cooling a heat generation source and a control means for controlling the cooling means, and positional information of the installation location of the heat generation source. And a storage means for storing rated power supply voltage and altitude information corresponding to the position information, the control means based on the position information acquired by the position information acquisition means. The cooling means is controlled according to the rated power supply voltage and the altitude information obtained with reference to the storage means.

  According to the present invention, it is possible to obtain a specific effect that the cooling effect on the heat source can be improved.

The perspective view which shows the projector which concerns on this embodiment. The right view which shows the projector. (A) The perspective view which shows the internal structure and arrangement | positioning of the projector which removed the exterior cover, (b) is a perspective view of the part enclosed by the thick line frame of (a). FIG. 2 is a cross-sectional view showing an internal configuration of the projector with an exterior cover removed. The figure explaining the flow of the exhaust air from the intake air in a projector. The block diagram which shows the structure of a projector.

Hereinafter, an embodiment of a projector 1 as an image projection apparatus to which the present invention is applied will be described.
FIG. 1 is a perspective view showing a projector 1 according to the first embodiment. FIG. 2 is a right side view. As shown in FIGS. 1 and 2, an operation unit 11 such as an operation button for a user to operate the projector 1 is provided on the upper surface of the projector 1. A zoom lever 12 is provided for enlarging or reducing the projection screen displayed on the screen 200.

  On the front side of the projector 1, a power switch 13 for turning on / off the apparatus power, an external input terminal 14 for connecting to an external device such as a personal computer or a video camera, a projection lens 15 for emitting light of a projected image, an apparatus environment A sensor 16 for detecting the illuminance is provided. An exhaust port 18 is provided in front of the projector 1. An intake port 17 for taking in cooling air is provided on the right side surface of the exterior cover in the projector 1.

FIG. 3A is a perspective view showing the internal configuration and arrangement of the projector 1 with the exterior cover removed, and FIG. 3B is a perspective view of a portion surrounded by a thick line frame in FIG. FIG. 4 is a cross-sectional view of the light source unit, the image generation unit, and the projection optical unit that constitute the projection mechanism unit.
As shown in FIGS. 3 and 4, the projector 1 includes a light source unit 20 including a discharge lamp 21 such as a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp. Moreover, the image generation part 30 which produces | generates an image using the light from the discharge lamp 21, and the projection optical part 40 which radiate | emits a projection image are provided.

  The light source unit 20 includes a light source unit 20 a having a discharge lamp 21 and an image illumination optical system 20 b having a color wheel 22, a light tunnel 23, and two relay lenses 24.

  The light from the discharge lamp 21 is separated into R, G, and B light in a time-division manner by passing through the rotating color wheel 22 as indicated by arrows in FIG. The color wheel 22 has a disk shape, is fixed to the motor shaft of the wheel motor 25, and is provided with filters such as R (red), G (green), and B (blue) in the rotation direction. The light separated by the color wheel 22 enters the light tunnel 23. The light tunnel 23 has a rectangular tube shape, and its inner peripheral surface is a mirror surface. The light incident on the light tunnel 23 is reflected by the mirror surface on the inner periphery of the light tunnel 23 a plurality of times and is emitted to the two relay lenses 24 as a uniform surface light source. As shown by the arrows in FIG. 4, the light passes through the two relay lenses 24, is reflected by the plane mirror 31 and the concave mirror 32 of the next-stage image generation unit 30, and is an image display element DMD (Digital Mirror Device) 33. The light is condensed and imaged on the image generation surface.

  Here, a plurality of movable micromirrors are arranged in a grid pattern on the image generation surface of the DMD 33. Each micromirror can incline the mirror surface by a predetermined angle around the twist axis, and can have two states of “ON” and “OFF”. When the micromirror is “ON”, the light from the discharge lamp 21 of the light source unit 20 is reflected toward the projection lens of the projection optical unit 40. When “OFF”, the light from the discharge lamp 21 is reflected toward the OFF light plate held on the side surface of the illumination bracket or the like. Therefore, by driving each mirror individually, light projection can be controlled for each pixel of the image data, and an image can be generated. In addition, the light reflected toward the OFF light plate is absorbed as heat and cooled by the flow of outside air.

  A projector 1 shown in FIG. 1 generates an image based on image data input from a personal computer, a video camera, or the like, and projects and displays the image on a screen 200 as a projection surface in FIG. A liquid crystal projector widely known as the projector 1 has recently been improved in the resolution, the price, and the like with an increase in the resolution of the liquid crystal panel, the efficiency of the light source lamp. In addition, a compact and lightweight projector 1 using a DMD that is an image display element has become widespread and has been widely used not only in offices and schools but also at home. Light emitted from the discharge lamp 21 is split into RGB by the color wheel 22 in the light source unit 20 and the emitted white light is guided to the DMD 33 of the image generation unit 30 and forms an image according to the modulation signal. The image is enlarged and projected by the projection optical unit 40.

FIG. 5 is a diagram for explaining the flow of intake to exhaust in the projector 1.
As shown in FIG. 5, the projector 1 includes an intake fan 61 as a cooling unit so as to face the intake port 17, and two exhaust fans 62 a and 62 b that exhaust air in the apparatus from the exhaust port 18. The centrifugal fan 63 is provided.

  As shown in FIG. 5, the cooling air taken from the intake port 17 by the intake fan 61 is disposed on the air flow path (indicated by arrow A in FIG. 5) from the intake fan 61 to the light source fan 62. The power supply unit 51 is cooled. The arranged power supply unit 51 is cooled. Thereafter, the air is exhausted from the exhaust port 18 by the exhaust fan 63b through an outlet provided in the light source housing that houses the light source unit 20a.

  The cooling air taken in from the intake port 17 by the intake fan 61 is drawn into the centrifugal fan 63 through the air flow path (indicated by arrow B in FIG. 5) from the intake fan 61. Thereafter, the light source unit 20a is cooled by being divided into two airs. The air is exhausted from the exhaust port 18 by the exhaust fan 62a from the centrifugal fan 63 through one air flow path (indicated by arrow C in FIG. 5), and the other air flow path (indicated by arrow D in FIG. 5). ) Is exhausted from the exhaust port 18 by the exhaust fan 62b.

  In this embodiment, for example, when the rated power supply voltage is as low as 100 [V] as in Japan, the cooling effect is increased by increasing the rotational speed of the intake fan 61 in FIG. On the other hand, when the rated power supply voltage is as high as 220 to 240 [V] as in Europe, for example, the noise is reduced by lowering the rotational speed of the intake fan 61. Further, when the projector 1 is installed at a high place, insufficient cooling is compensated for by increasing the rotational speeds of the intake fan 61, the exhaust fans 62a and 62b, and the centrifugal fan 63 in accordance with a decrease in atmospheric pressure.

FIG. 6 is a block diagram showing the configuration of the projector 1.
As shown in FIG. 6, the control unit 100 as a control unit includes a CPU (Central Processing Unit) as a calculation unit, a RAM (Random Access Memory) as a storage unit, a RAM (Read Only Memory), and the like. Various components are electrically connected to the control unit 100 that controls the entire projector so that they can communicate with each other. The GPS reception processing device 101 as position information acquisition means receives a radio wave (GPS signal) from a satellite by the GPS antenna 102 and detects position information (positioning data (longitude, latitude)) based on the received GPS signal. . The control unit 100 refers to the database 103 as storage means based on the position information. The rated power supply voltage and altitude information corresponding to the place where the projector 1 is installed are read out. The cooling means is controlled according to the rated power supply voltage and altitude information. Thereby, the cooling means can be optimally controlled according to the difference in the rated power supply voltage and the difference in the altitude information without providing a detection circuit for detecting the rated power supply voltage. Therefore, the cooling effect for the heat generation source can be improved. The database 103 previously corresponds to the rated power supply voltage, altitude information (altitude) for each country, address, etc., and the rotation speed and language of each fan that does not have a cooling effect corresponding to the rated power supply voltage or altitude information. Information on country (region) and address is stored.

  As described above, the position information is acquired based on the GPS signal, the rated power supply voltage and the altitude information are obtained by referring to the database from the position information, and in some areas, the rotation speed of the cooling fan is kept low and the noise is reduced. Is possible. Note that the cooling device of this embodiment includes a control unit 100, a GPS reception processing device 101, a GPS antenna 102, a database 103, and a fan control unit 104. The position information of the projector 1 can also be acquired by receiving the position information acquired by the mobile phone possessed by the operator in the vicinity of the projector.

  The fan control unit 104 controls the rotational speeds of the intake fan 61, the exhaust fans 62a and 62b, and the centrifugal fan 63 based on the information. Specifically, the intake fan 61, the exhaust fans 63a and 63b, and the centrifugal fan 63 are each provided with a rotation speed detection sensor that detects the rotation speed. Based on the detection results of these rotation speed detection sensors, the fan control unit 104 sets the intake fan 61, the exhaust fans 63a and 63b, and the centrifugal fan 63 so that the set rotation speed can be obtained without excessive or insufficient cooling. The drive is controlled.

  In addition, it is possible to input manually or provide an input means that can be selected from a list displayed on a display unit such as a monitor, and manually input information such as country, address, language, etc., or a country displayed on the display unit, It is also possible to select from a list of addresses, languages, etc. Therefore, even if no receiving means for receiving radio waves from a satellite or a mobile phone is provided, the position information is acquired based on the input information, and the projector 1 is installed from the database based on the position information. It is possible to obtain the rated power supply voltage and altitude information of the place where the vehicle is located. Thereby, cost reduction can be achieved.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
In a cooling device comprising a cooling means such as an intake fan 61 for cooling a heat generation source such as a power supply unit 51 and a control means such as a fan control unit 104 for controlling the cooling means, positional information of the location of the heat generation source Position information acquisition means such as a GPS reception processing device 101, and storage means such as a database 103 for storing rated power supply voltage and altitude information corresponding to the position information, the control means acquiring the position information The cooling means is controlled in accordance with the rated power supply voltage and the altitude information obtained by referring to the storage means based on the position information acquired by the means.
According to this aspect, the rated power supply voltage can also be detected using the position information acquired in order to obtain the altitude information of the installation location of the heat source in the conventional example. Specifically, the rated power supply voltage and altitude information corresponding to the position information are stored in the storage means. Then, the storage means is referred to based on the position information acquired by the position information acquisition means, and the rated power supply voltage and altitude information corresponding to the position information are read from the storage means and acquired. The cooling means is controlled according to the rated power supply voltage and altitude information. Thereby, the cooling means can be optimally controlled according to the difference in the rated power supply voltage and the difference in the altitude information without providing a detection circuit for detecting the rated power supply voltage. Therefore, the cooling effect for the heat generation source can be improved.

(Aspect B)
In (Aspect A), the position information acquisition unit acquires the position information of the installation location of the heat source acquired from radio waves transmitted from a satellite.
According to this aspect, the position of the installation location of the heat source can be detected with high accuracy.

(Aspect C)
In (Aspect A), the position information acquisition unit receives position information acquired by a mobile phone in the vicinity of the heat generation source, and acquires position information of an installation location of the heat generation source.
According to this aspect, by receiving the position information acquired by the mobile phone held by the operator around the heat source, even if the radio wave from the satellite cannot be received, the location of the heat source is determined. You can earn location information. Therefore, optimal control of the cooling means can be stably performed.

(Aspect D)
In (Aspect A) to (Aspect C), an input means for inputting a language, altitude, country, and address is provided, and the position information acquisition means is position information based on the language, altitude, country, and address input by the input means. To get.
According to this aspect, even if no receiving means for receiving radio waves from a satellite or a mobile phone is provided, the position information of the installation location of the heat generation source is acquired by the language, altitude, country, and address input by the input means. be able to. Therefore, it is not necessary to provide expensive receiving means, leading to cost reduction.

(Aspect E)
In (Aspect A) to (Aspect D), the cooling means is a cooling fan such as an intake fan 61, and the control means increases the rotational speed of the cooling fan when the rated power supply voltage is low, and the rated power supply When the voltage is high, the driving of the cooling fan is controlled so as to reduce the rotation speed of the cooling fan.
According to this aspect, if the rated power supply voltage is low, the heat generation amount of the heat generation source increases, and at this time, the cooling effect is increased by increasing the number of revolutions of the cooling fan. On the other hand, if the rated power supply voltage is high, the amount of heat generated by the heat generation source is reduced. At this time, the number of rotations of the cooling fan can be lowered to suppress an excessive cooling effect, and noise from the cooling fan can be suppressed.

(Aspect F)
In (Aspect A) to (Aspect E), the cooling means is a cooling fan, and the control means increases the number of rotations of the cooling fan when the installation location of the heat generation source is high. When the altitude of the installation place is low, the driving of the cooling fan is controlled so as to reduce the rotation speed of the cooling fan.
According to this aspect, when the altitude of the installation location of the heat generation source is high, the atmospheric pressure is lowered and the density of the air is lowered to lower the cooling efficiency. At this time, the cooling effect is increased by increasing the rotation speed of the cooling fan. On the other hand, when the altitude of the installation location of the heat source is low, the cooling fan speed can be lowered to prevent an excessive cooling effect. Thereby, the cooling effect without excess and deficiency is acquired.

(Aspect G)
In the image projection apparatus such as the projector 1 that projects an image using the light source such as the discharge lamp 21, the cooling unit that cools the object to be cooled, and the light from the light source, the cooling unit includes (Aspect A) to (Aspect F). The cooling device according to any one of items 1) is used.
According to this aspect, since the light source can be stably driven in an appropriate operating temperature range, stable image quality can be provided.

DESCRIPTION OF SYMBOLS 1 Projector 11 Operation part 12 Zoom lever 13 Power switch 14 External input terminal 15 Projection lens 16 Sensor 17 Intake port 18 Exhaust port 20 Light source unit 20a Light source unit 20b Image illumination optical system 21 Discharge lamp 22 Color wheel 23 Light tunnel 24 Relay lens 30 Image generation unit 31 Flat mirror 32 Concave mirror 33 DMD
40 Projection optical unit 61 Intake fan 62a Exhaust fan 62b Exhaust fan 63 Centrifugal fan 100 Control unit 101 GPS reception processing device 102 GPS antenna 103 Database 104 Fan control unit 200 Screen

JP 2006-293120 A Japanese Patent No. 4097616

Claims (7)

In a cooling device comprising a cooling means for cooling a heat source and a control means for controlling the cooling means,
Position information acquisition means for acquiring position information of an installation location of the heat source;
Storage means for storing rated power supply voltage and altitude information corresponding to the position information;
The control means controls the cooling means according to the rated power supply voltage and the altitude information obtained by referring to the storage means based on the position information acquired by the position information acquisition means. Characteristic cooling system. The cooling device according to claim 1, wherein
The cooling apparatus according to claim 1, wherein the position information acquisition unit acquires position information of an installation location of the heat source acquired from radio waves transmitted from a satellite. The cooling device according to claim 1, wherein
The cooling apparatus according to claim 1, wherein the position information acquisition unit receives position information acquired by a mobile phone in the vicinity of the heat source and acquires position information of an installation location of the heat source. In the cooling device according to any one of claims 1 to 3,
A cooling apparatus comprising input means for inputting a language, altitude, country, and address, wherein the position information acquisition means acquires position information based on the language, altitude, country, and address input by the input means. In the cooling device according to any one of claims 1 to 4,
The cooling means is a cooling fan, and the control means increases the rotation speed of the cooling fan when the rated power supply voltage is low, and decreases the rotation speed of the cooling fan when the rated power supply voltage is high. A cooling device that controls driving of a cooling fan. In the cooling device according to any one of claims 1 to 5,
The cooling means is a cooling fan, and the control means increases the number of rotations of the cooling fan when the altitude of the installation location of the heat source is high, and the cooling fan when the altitude of the installation location of the heat generation source is low. A cooling device that controls driving of the cooling fan so as to reduce the rotation speed of the cooling fan. In an image projection device that projects an image using a light source, cooling means for cooling an object to be cooled, and light from the light source,
An image projection apparatus using the cooling device according to claim 1 as the cooling means.

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