JP4948086B2 - Thermal countermeasure structure of projector - Google Patents

Description

  The present invention relates to a heat countermeasure structure of a projector that projects an image on a screen in a home, a store, a showroom, an exhibition, or the like.

  In recent years, light and small projectors that can be carried around have been actively developed and manufactured. When watching TV and video images on a large screen, enjoying a home theater, or connecting to a personal computer for business presentations. It is used in some cases (see Patent Documents 1 and 2).

By the way, there are various problems with the projector, and one of them is a countermeasure against heat. Explaining this point, the projector incorporates a high-output light source that is a heat source and a circuit board for image processing in its housing, and circuit elements are mounted on this circuit board. Otherwise, the heat of the light source may adversely affect the circuit board and circuit elements, leading to malfunctions and malfunctions.
In view of this point, conventionally, there is a method of interposing a thick heat insulating material such as urethane between the light source and the circuit board or circuit element, or cooling the circuit board or circuit element by blowing with a large dedicated cooling fan. It has been adopted.
JP 2006-72149 A JP 2005-157237 A

The conventional projector is configured as described above, and a thick heat insulating material is interposed between the light source and the circuit board or circuit element, or the circuit board or circuit element is blown and cooled by a large dedicated cooling fan.
However, when such a method is adopted, although it is a countermeasure against heat, it requires a large space for installation. Therefore, the projector cannot be reduced in weight and size, and it is difficult to carry, store, and store. A new big problem will arise.

  The present invention has been made in view of the above, and provides a thermal countermeasure structure for a projector that suppresses the adverse effect of the heat generation area of the projector on the heat suppression area and can be reduced in weight and size. It is aimed.

In the present invention, in order to solve the above problem, the interior of the portable housing of the projector is divided into a heat generation area and a heat suppression area by an intermediary for heat countermeasures, and a light source, a lens and a mirror are arranged in the heat generation area. The circuit board is arranged in the heat suppression area ,
The intervening body includes a flexible heat insulating layer made of a nonwoven fabric or glass paper having a porosity of 90% or more, a heat radiation layer provided opposite to the heat insulation layer with a spacer layer, and the heat insulation layer and the heat radiation layer. It has a substantially plate shape including an air layer formed between them, and a heat insulating layer is impregnated with a polymer substance by a dipping method to have a thickness of 1.0 to 1.5 mm. And the heat dissipation layer is directed to the heat suppression region side .

  Here, the projector in the claims may be a portable type, a ceiling type, a type connected to the document camera device, or the like. As a method of partitioning the inside of the projector into a heat generation area and a heat suppression area by an interposition body, a method in which a substantially plate-shaped interposition body is interposed between the heat generation area and the heat suppression area, or the interposition body is predetermined. (For example, box shape, hollow hemispherical shape, hollow semi-elliptical shell shape, etc.) to cover, wrap, or fit the heat generation area or heat suppression area It is done.

  The heat generation region and the heat suppression region are not particularly limited to a plurality. The suppression area may be a space in the projector or a single or a plurality of circuit components. Furthermore, the heat insulation layer may or may not be the same size as the dust generation prevention layer and the heat dissipation layer.

According to the present invention, rather than interposing a thick heat insulating material between the light source in the heat generation area and the circuit board in the heat suppression area, or blowing and cooling the circuit board or the like with a large dedicated cooling fan, the porosity is increased. Since a thin heat insulating layer made of 90% or more of nonwoven fabric or glass paper is interposed, it can contribute to lightening and downsizing of the projector, and there is little effect on carrying, storing and storing the projector. . In addition, since the heat-insulating layer having a large void ratio blocks and suppresses the heat from the heat generation area from adversely affecting the heat suppression area, it is possible to eliminate the possibility of causing a malfunction or malfunction of the projector. In addition, since the heat insulating layer of the interposer is impregnated with resin or the like to prevent dust generation, there is little adverse effect on various lenses, mirrors, images, and the like.

Further, by impregnating the heat insulating layer with a resin that is plastically deformed, the heat insulating layer can be easily formed, drawn, bent, or the like using a mold. Moreover, since the heat insulating layer of the interposer is a flat plate, the processing can be facilitated. In addition, since heat that cannot be released by the heat dissipation layer or heat of the heat insulation layer is released and released, problems associated with heat storage on the heat dissipation layer side of the heat insulation layer can be solved. In addition, since the heat radiation layer functions as a support plate for the heat insulating layer that is easily bent, it is possible to expect the shape of the heat insulating layer to be maintained with a simple configuration, thereby facilitating handling. Moreover, since an air layer with little heat conduction is interposed between the heat insulating layer and the heat radiating layer, heat is hardly transmitted to the heat radiating layer, and the heat insulating effect can be further improved with a simple configuration.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. A thermal countermeasure structure for a projector according to the present embodiment includes a heat generation area 4 and thermal suppression inside the projector 1 as shown in FIG. 1 and FIG. It divides into the area | region 16, and the intervention body 20 for heat countermeasures is interposed as a partition wall between these heat generation area | regions 4 and the heat suppression area | region 16, and this intervention body 20 is formed with the thin heat insulation layer 21. ing.

  As shown in FIG. 1, the projector 1 includes a portable housing 2 having a size and weight, and the housing 2 includes a heat generation region 4 including a light source 6 and a circuit board 17 for image processing. Divided into a heat suppression region 16. The housing 2 is formed into a substantially rectangular box shape using a molding material such as ABS resin or polycarbonate, and an exhaust port 3 for exhausting the exhaust air inside the housing 2 to the outside is arranged on the peripheral wall. Established.

  As shown in FIG. 2, the heat generating region 4 includes a light source 6 such as a halogen lamp that is built in a reflector 5 in the housing 2 and irradiates a front lens 7 with a light beam (see an arrow in the figure), and a lens 7. A light tunnel 9 for uniformizing the light rays irradiated through the reflecting mirror 8, a color wheel 10 that is located on the light output side of the light tunnel 9 and transmits red, blue, and green light rays, and this color wheel 10 from the condenser lens 11 positioned on the light beam output unit side, a plurality of folding mirrors 12 for uniformly adjusting the optical axes of the red, blue, and green rays that have passed through the condenser lens 11, and the plurality of folding mirrors 12. A DMD (digital micromirror device) 13 on which red, blue, and green light rays are incident, and a projection lens 1 that magnifies and projects an image displayed by the DMD 13 onto a screen Configured with the door.

  The color wheel 10 has a structure in which a plurality of filters that transmit red, blue, and green light beams are rotatably provided. The DMD 13 is a reflective display element having a plurality of micromirrors. In order to form an image of each incident light color, a mirror that forms an image is turned on by turning on a mirror that forms an image in each mirror. It functions to irradiate the projection lens 14 with the light.

  In addition to the above components, the heat generating area 4 includes a cooling fan 15 that cools the reflector 5, the light source 6, and the light tunnel 9, and the like, a power source that supplies power to the reflector 5, the light source 6, the DMD 13, the cooling fan 15, and the like. A substrate (not shown) or the like is disposed.

  The heat suppression region 16 includes a circuit board 17 for image processing, and a large number of various circuit elements 18 and components are mounted on the circuit board 17. Examples of the circuit element 18 and components include a semiconductor IC, an interface connector, and an acoustic component.

  The intervening body 20 is formed by a flexible heat insulating layer 21 made of a thin and soft nonwoven fabric or glass paper having a porosity of 90% or more (for example, 10 times or more when converted to the foaming ratio of the resin foam). A predetermined resin (for example, polyethylene, polystyrene, epoxy, or the like) or an elastomer (for example, silicone rubber) that is a high molecular substance is impregnated as necessary, so that the peripheral portion of the heat insulating layer 21 breaks down and fibers or glass fibers. It is formed so that the dust which consists of etc. does not generate | occur | produce.

  As the non-woven fabric, for example, a commercially available type (for example, manufactured by Asahi Kasei Chemicals Corporation, manufactured by Nippon Medical Products Co., Ltd.) using glass, thermoplastic resin, liquid crystal polymer, or the like is used. In addition, as for the glass paper, a commercially available type (for example, manufactured by Nippon Inorganic Co., Ltd., manufactured by Nippon Sheet Glass Co., Ltd., manufactured by Oji Special Paper Co., Ltd.), etc., made from ultra fine glass fibers excellent in heat resistance and electrical insulation is used. The

In the impregnation with resin or elastomer, for example, a resin melted in a solvent is prepared to prepare a solution, the interposer 20 is immersed in this solution to infiltrate the resin, and then the interposer 20 is pulled up and dried. It is carried out by an immersion method.
Such an interposer 20 is installed on the inner wall of the housing 2 via a fixture to partition the heat generation region 4 and the heat suppression region 16 in a non-communication state, and heat from the light source 6 in the heat generation region 4 is thermally suppressed. It functions to suppress and prevent adverse effects on the circuit board 17 and the circuit elements 18 in the region 16.

  According to the above configuration, a thick heat insulating material (for example, 2.5 to 3.0 mm) is interposed between the light source 6 and the circuit board 17 or the circuit element 18, or the circuit board 17 or the circuit element 18 is Rather than blowing and cooling by a dedicated cooling fan, a thin heat insulating layer (for example, 1.0 to 1.5 mm) 21 made of a nonwoven fabric or glass paper having a porosity of 90% or more is interposed. This greatly contributes to downsizing and does not hinder the carrying, storage, storage, etc. of the projector 1.

  Further, since the heat insulating layer 21 having a large porosity blocks and prevents the heat from the heat generation region 4 from adversely affecting the heat suppression region 16, the possibility of causing malfunction or malfunction of the projector 1 is extremely effectively eliminated. can do. In addition, since the heat insulating layer 21 as the interposition body 20 is impregnated with resin or the like to prevent dust generation, various lenses, mirrors, images, and the like are not adversely affected.

  Further, by impregnating the heat insulating layer 21 with a resin that is plastically deformed, the heat insulating layer 21 can be easily formed, drawn, bent, or the like using a mold. Furthermore, since the interposer 20 is made of a flexible flat heat insulating layer 21, it is possible to greatly expect easy processing.

  Next, FIG. 3 shows a second embodiment of the present invention. In this case, the interposer 20 is formed by a thin heat insulating layer 21, and the heat insulating layer 21 is a circuit board which is the heat suppression region 16. According to the shape of the 17 circuit elements 18 and the like, it is bent and formed into a box shape, and this heat insulating layer 21 is fitted to the circuit elements 18 and the like so as to be covered and protected. About another part, it is the same as that of the said embodiment.

  In this embodiment, the same effect as that of the above embodiment can be expected, and the covering body 20 can be fitted and protected only to the circuit element 18 or the like that needs to be insulated. Clearly, waste can be eliminated.

  Next, FIG. 4 shows a third embodiment of the present invention. In this case, the dust-preventing layers 22 are respectively provided on the front and back surfaces of the heat insulating layer 21 as the interposition body 20 through an adhesive film (not shown). They are stacked and integrated.

Examples of each dusting prevention layer 22 include a PET film, a sponge having a high heat insulating effect, a heat radiating sheet made of a foamed sheet, a metal foil, or the like. About another part, it is the same as that of the said embodiment.
Also in this embodiment, the same effect as the above embodiment can be expected, and moreover, dust generation of the heat insulating layer 21 is more effectively prevented than in the case where each dust generation prevention layer 22 is impregnated with resin. Clearly, it is not necessary to impregnate the heat insulating layer 21 with 20 with a resin, and the processing and manufacturing method of the heat insulating layer 21 can be simplified.

  Next, FIG. 5 shows a fourth embodiment of the present invention. In this case, the heat insulating layer 21 is sandwiched and integrated between the heat-dissipating layer 23 and the dust-preventing layer 22 facing each other. The interposer 20 is formed in a multilayer structure.

  The heat-dissipating layer 23 and the dust-preventing layer 22 are laminated on the front and back surfaces of the heat-insulating layer 21 by adhering to each other via an adhesive film. The heat dissipation layer 23 is formed using, for example, an aluminum plate, a copper plate, a copper alloy plate, or the like, and is disposed so as to face the heat suppression region 16 side opposite to the heat insulating layer 21. However, if there is a concern about the problem of the circuit board 17 or the circuit element 18 in the heat suppression region 16, the resin can be formed by filling the resin with a heat dissipating filler.

  Examples of the resin of the heat dissipation layer 23 in this case include polyethylene, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, PVC, polystyrene, BR, SBR, and a thermoplastic elastomer. In addition, as the heat dissipating filler, heat conductive metal oxide such as aluminum oxide or boron nitrite, metal nitride, or the like is used. Moreover, although the dust generation prevention layer 22 adheres and is laminated | stacked on the heat insulation layer 21, if it is not necessary, it can also be abbreviate | omitted. About another part, it is the same as that of the said embodiment.

  In this embodiment, the same effect as that of the above embodiment can be expected, and the heat dissipation layer 23 dissipates the heat that cannot be released by the cooling fan 15 and the heat of the heat insulation layer 21, so that the heat dissipation layer of the heat insulation layer 21 is released. It is clear that the problems associated with heat storage on the 23rd side can be solved. Further, since the heat radiation layer 23 functions as a support plate for the heat insulating layer 21 that is easily bent, the shape of the heat insulating layer 21 can be expected to be maintained with a simple configuration, and the handling is facilitated.

  Next, FIG. 6 shows a fifth embodiment of the present invention. In this case, an air layer 24 of dry air is integrally formed between the heat insulating layer 21 and the heat radiating layer 23 via the spacer layer 25. Like to do. About another part, it is the same as that of the said embodiment.

  Also in this embodiment, the same effect as the above embodiment can be expected, and since the air layer 24 with less heat conduction is interposed between the heat insulating layer 21 and the heat radiating layer 23, heat is hardly transmitted to the heat radiating layer 23. It is obvious that the heat insulation effect can be further improved with a simple configuration.

  In the above embodiment, the intervention body 20 is simply built in the projector 1, but the present invention is not limited to this. For example, a part of the built-in interposer 20 is exposed to the outside of the housing 2 to improve the heat dissipation effect, or the heat-insulating layer 21 and the heat-dissipating layer 23 of the interposer 20 are made different in size. Only the outside of the housing 2 may be exposed to obtain a heat dissipation effect. Further, at this time, a heat conductive layer of substantially the same material may be laminated on the heat dissipation layer 23 of the interposer 20 to improve the heat dissipation effect.

1 is an overall perspective explanatory view schematically showing a projector in an embodiment of a thermal countermeasure structure for a projector according to the present invention. 1 is a partial cross-sectional explanatory view schematically showing a projector in an embodiment of a thermal countermeasure structure for a projector according to the present invention. FIG. 6 is a perspective explanatory view schematically showing a second embodiment of the thermal countermeasure structure for a projector according to the invention. It is explanatory drawing which shows typically 3rd Embodiment of the thermal countermeasure structure of the projector which concerns on this invention. It is explanatory drawing which shows typically 4th Embodiment of the heat countermeasure structure of the projector which concerns on this invention. FIG. 10 is an explanatory cross-sectional view schematically showing a fifth embodiment of the thermal countermeasure structure for a projector according to the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Case 4 Heat generation area 6 Light source 14 Projection lens 16 Heat suppression area 17 Circuit board 18 Circuit element 20 Intercalation body 21 Heat insulation layer 22 Dust generation prevention layer 23 Heat dissipation layer 24 Air layer

Claims (1)

The interior of the projector's portable housing is partitioned into a heat-generating area and a heat-suppressing area with an intermediary for heat countermeasures. The thermal countermeasure structure of the projector
The intervening body includes a flexible heat insulating layer made of a nonwoven fabric or glass paper having a porosity of 90% or more, a heat radiation layer provided opposite to the heat insulation layer with a spacer layer, and the heat insulation layer and the heat radiation layer. It has a substantially plate shape including an air layer formed between them, and a heat insulating layer is impregnated with a polymer substance by a dipping method to have a thickness of 1.0 to 1.5 mm. A heat countermeasure structure for a projector, characterized in that the heat dissipation layer faces the heat suppression area .

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