JP2020020824A - Intake air temperature sensor and projection type display device having cooler - Google Patents

Abstract

To provide a compact structure in which an intake air temperature sensor held by an image projection device is provided on the outside of an air intake duct having a dustproof filter, with which it is possible to stably measure an intake air temperature without obstructing a cooling air in the vicinity of an air intake port.SOLUTION: An image projection device of the present invention comprises: a housing; a mechanism for taking in the outside air into the inside of the housing; cooling means for taking in the outside air into the inside of the housing; a sensor for measuring the temperature of the outside air; and a substrate having the sensor for measuring the temperature of the outside air. In a structure where the cooling means adjoins the mechanism for taking in the outside air into the inside of the housing and the cooling means is installed by being inclined to the horizontal plane, the substrate having the sensor for measuring the temperature of the outside air is installed between the mechanism for taking in the outside air into the inside of the housing and the cooling means installed inside the housing by being inclined to the horizontal plane.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an arrangement of a temperature sensor, and particularly to an intake air temperature sensor of a projection display device.

  Conventionally, an intake air temperature sensor in a projection display device is generally arranged in or near a duct inside a dustproof filter. The reason is that, since the interior of the intake duct is basically a space with no structure, the arrangement of the intake air temperature sensor is such that it is difficult for the intake air resistance to be low and it is easy to find a position where the intake air temperature can be measured accurately. Was.

  Patent Literature 1 discloses a technology in which a temperature sensor is disposed inside an intake duct and downstream of a dustproof filter, and controls the strength of a cooling unit as needed.

JP 2015-179161 A

  However, from the viewpoint of dustproofness and secondary air mixing, it is desirable that the intake air temperature sensor be installed in a portion other than the intake duct having the filter. In this case, it is necessary to arrange a substrate with a temperature sensor near the intake port so that the temperature of the outside air can be stably detected. Further, in view of the miniaturization of the device, the arrangement of the sensor substrates must not affect the size of the entire image projection device.

  Therefore, an object of the present invention is to provide a compact projection display device capable of stably measuring an intake air temperature when an intake air temperature sensor is arranged outside an intake duct having a filter.

In order to achieve the above object, the projection display device according to the present invention,
A housing,
A mechanism for taking in outside air into the housing;
Cooling means for taking in outside air into the housing;
A sensor for measuring the temperature of the outside air,
A substrate having a sensor for measuring the temperature of the outside air,
A configuration in which the cooling means is adjacent to a mechanism for taking in outside air into the housing, and wherein the cooling means is installed at an angle to a horizontal plane, a mechanism for taking in outside air into the housing; and A substrate having a sensor for measuring the temperature of the outside air is disposed between the cooling means and the cooling means disposed at an angle to a horizontal plane.

  ADVANTAGE OF THE INVENTION According to this invention, the compact projection type display apparatus which can measure an intake air temperature stably without obstructing the cooling wind near an intake port can be provided.

FIG. 1 is an overall configuration diagram of a projection display device of the present invention. It is a sectional view showing the example of composition of the image projection device concerning a first embodiment. It is a sectional view showing the example of composition of the image projection device concerning a second embodiment. It is a sectional view showing the example of composition of the image projection device concerning a third embodiment. It is sectional drawing of a comparison object apparatus. It is sectional drawing of a comparison object apparatus.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 are schematic diagrams according to an embodiment of the present invention.

  FIG. 1 is a diagram illustrating the overall configuration of the projection display device.

  1 is a projection display device, 2 is an exterior component for housing various units, 3 is an intake air temperature sensor board for measuring the temperature of air introduced into the housing, 4 is an intake axial flow fan for introducing air into the housing, 5 Is a substrate for driving the projection display device, 6 is an exhaust axial flow fan for discharging air in the housing, 71 is a light source unit, 72 is an intake filter for removing dust in the air, 73 is a light source A projection lens for enlarging and projecting the light from the external screen 71 to the external screen, an optical cooling duct 74 for guiding the wind for cooling the optical components including the light modulation element to the optical components, and a reference numeral 75 for the white light from the light source 71 to R (red) ), G (green), and B (blue), and shows an optical component group that stores optical components that lead to light modulation elements corresponding to each color.

  Hereinafter, the arrangement of the intake air temperature sensor board according to the first embodiment of the present invention will be described with reference to FIG.

  The intake axial flow fan 4 disposed near the intake port 2a of the projection display device 1 is inclined with respect to the horizontal plane, and the intake temperature sensor substrate 3 is disposed in the space formed thereby. Thus, the intake air temperature sensor 3a can measure the intake air temperature stably without obstructing the cooling air of the intake axial flow fan 4, and can measure the intake air temperature between the intake axial flow fan 4 and a perpendicular drawn from the upper end thereof. Other components can be arranged in the space 8, resulting in a compact configuration.

  Hereinafter, with reference to FIG. 3, an arrangement of a cooling target according to the second embodiment of the present invention will be described.

  In addition to the configuration of the first embodiment, a substrate 5 to be cooled is disposed downstream of the intake axial flow fan 4. At this time, in order to blow the cooling air of the intake axial flow fan 4 over the entire area of the substrate 5, it is preferable that the intake axial flow fan 4 is disposed at an end of the substrate 5. Since the intake axial-flow fan 4 is inclined, the intake-air temperature sensor substrate 3 is arranged along the flow of intake air, but the substrate 5 is disposed on the downstream side of the intake axial-flow fan 4 with good space efficiency. And a compact configuration can be provided.

  Now, a projection display device (hereinafter, referred to as a “comparison target device”) to be compared with the projection display device 1 according to the present embodiment will be described.

  FIG. 5 is a cross-sectional view of the comparison target device corresponding to the cross-sectional view of the projection display device 1 shown in FIG.

  As shown in FIG. 5, the comparison target device differs from the projection display device 1 according to the present embodiment in that the intake axial flow fan 4 is not inclined with respect to the horizontal plane. In the comparative device, since the intake axial flow fan 4 is installed at a position avoiding the intake air temperature sensor substrate 3 without tilting the intake axial flow fan 4, wasteful space is generated. A cooling target having the same size as the substrate 5 of the display device 1 cannot be installed.

  FIG. 6 is also a cross-sectional view of the comparison target device corresponding to the cross-sectional view of the projection type device 1 shown in FIG.

  As shown in FIG. 6, the comparison target device is such that the intake axial flow fan 4 is not inclined with respect to the horizontal plane, and the intake air temperature sensor substrate 3 follows the flow of the cooling air of the intake axial flow fan 4. It is different from the projection display device 1 according to the present embodiment in that it is not arranged in a shape. In the comparison target device of FIG. 6, it is possible to install a cooling target having the same size as the substrate 5, but the intake air temperature sensor 3 a is installed in a posture opposed to the intake air flow of the intake axial flow fan 4. Therefore, there is a high possibility that the intake air temperature cannot be measured stably and accurately.

  On the other hand, according to the configuration of the projection display device 1 according to the present embodiment, the internal space of the projection display device 1 can be used efficiently. In addition, by adjusting the inclination of the intake axial flow fan 4 with respect to the substrate 5, fresh cooling air is also delivered to the substrate element 57 and the substrate element 58 located far from the intake axial flow fan 4. be able to. Further, since the intake air temperature sensor substrate 3 is arranged along the flow of the intake axial flow fan 4, the intake air temperature sensor 3a can be used while minimizing the intake air resistance generated by the intake air temperature sensor substrate 3. Intake air temperature can be measured stably.

  Hereinafter, the effective use of the cooling air according to the third embodiment of the present invention will be described with reference to FIG.

  In addition to the form of the second embodiment, when there is a substrate element 59 that generates a large amount of heat in the substrate 5, a cooling metal plate 5a is used, and the substrate element 59 is brought into contact with the cooling plate metal 5a to conduct heat conduction of the solid. Cooling may be performed by using the Here, by providing a substrate hole 5b with respect to the substrate 5 and guiding the cooling air of the intake axial flow fan 4 to the cooling metal plate 5a, the substrate element 59 can be efficiently used by using the heat conduction and cooling air of the solid. Cooling can be performed, and at the same time, the intake air temperature sensor 3a can stably measure the intake air temperature, and a compact configuration can be provided.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

1 Projection display device, 2 exterior parts, 2a intake port, 2b exhaust port,
3 intake temperature sensor board, 3a intake temperature sensor, 4 intake axial flow fan,
5 substrate, 5a cooling sheet metal, 5b substrate hole, 51-59 substrate element,
6 exhaust axial flow fan, 7 engine unit, 71 light source section, 72 intake filter,
73 projection lens, 74 cooling duct, 75 optical parts group, 8 spaces

Claims (5)

A housing,
A mechanism for taking in outside air into the housing;
Cooling means for taking in outside air into the housing;
A sensor for measuring the temperature of the outside air,
A substrate having a sensor for measuring the temperature of the outside air,
A configuration in which the cooling means is adjacent to a mechanism for taking in outside air into the housing, and wherein the cooling means is installed at an angle to a horizontal plane, a mechanism for taking in outside air into the housing, and an inside of the housing. An image projection device, wherein a substrate having a sensor for measuring the temperature of the outside air is installed between the cooling unit and the cooling unit installed at an angle to a horizontal plane. 2. The image projection device according to claim 1, wherein another component is installed between the cooling unit installed at an angle with respect to the horizontal plane and a vertical line drawn from an upper end thereof. 3. The image projection device according to claim 2, wherein a cooling target component is installed downstream of the cooling unit that is installed to be inclined with respect to the horizontal plane. 4. The cooling target component according to claim 3, wherein when the component to be cooled is a board having a heat transfer sheet metal, a part of the board has a wind guide hole, and the cooling air of the cooling unit is directly guided to the heat transfer sheet metal. Image projection device. The image projection device according to claim 4, wherein a substrate holding the heat transfer sheet metal is installed at an angle with respect to a horizontal plane to guide cooling air from the cooling unit directly to the heat transfer sheet metal.