KR20080022385A - Projector - Google Patents

Abstract

A projector is provided to prevent exhausted hot air from disturbing image beams projected from a lens by changing the exhaust path of air through a flow changing unit. A projector comprises a frame(100), an optical system(200), and a cooling system(300). The frame includes an air inlet(110) and an air outlet(120). The optical system forms images. The cooling system is configured to cool heat generated inside the projector. The cooling system includes at least one cooling fan(310), a duct(320), and a flow changing unit(330). The cooling fan sucks cooling air through the air inlet. The duct has a component generating high temperature heat and guides the air generated by the cooling fan to the front side of the frame. The flow changing unit is configured to change flow of air guided through the duct to the lateral side of the frame and discharges the air to the outside. The flow changing unit includes a plurality of flow guides(333) which curve from the front side to the lateral side.

Description

Projector {PROJECTOR}

1 is a cross-sectional view schematically showing a typical projector,

2 is according to an embodiment of the present invention A cross-sectional view schematically showing the projector, and

FIG. 3 is a perspective view of the flow path changing means of the projector of FIG. 2.

<Description of Symbols for Main Parts of Drawings>

100; Frame 110; Intake vent

120; Vent 200; Optical system

210; Lamp 240; Power supply

250; Ballast 300; Chiller

310; Cooling fan 320; duct

330; Flow path changing means 331; Upper Bracket

332; Lower bracket 333; Euro guide

The present invention relates to an image projection system, and more particularly to a digital light processing (DLP) type projector.

Projectors can be divided into Cathode Ray Tube (CRT) projection, Liquid Crystal Display (LCD) projection, and Digital Light Processing (DLP) projection, depending on the type of device that implements the image.

Unlike the conventional CRT displaying color gamut using an electron gun, the dual DLP projection method displays the color gamut of RGB by using a color wheel for light emitted from a light source. The drive mirror acts as a mechanism for magnifying projection using an integrated digital micro-mirror device (DMD) assembly. The method using the DMD assembly is a digital display technology that does not have a problem of color fading or bad pixels, and thus is widely used because light utilization efficiency is higher than that of other methods.

1 is a cross sectional view schematically showing such a general projector.

As shown, a typical projector includes a frame 10, an optical system 20, and a cooling device 30 for cooling heat generated therein.

The frame 10 serves to form the appearance of the projector, and is provided with an inlet port 11 and an exhaust port 12 serving as an access passage of air at a predetermined position. The intake port 11 is disposed on the outer surface of the frame 10, and the exhaust port 12 is disposed on the front surface.

The optical system 20 is formed with an image projected onto a screen (not shown). In the figure, a lamp 21, a DMD 22 and a projection lens 23 are shown. The lamp 21 is a high-power discharge lamp is used, the DMD 22 forms the light incident from the lamp 21 as image light having image information, the projection lens 23 is the image light To project on the screen. In addition, the optical system 20 may further include optical elements such as a color wheel and a reflector.

A power supply 24 for supplying power to the projector is disposed behind the DMD 22, and a ballast 25 for operating the lamp 21 is disposed at one side of the power supply 24.

The cooling device 30 serves to cool the heat generated inside the projector and includes a cooling fan 31 and a duct 32.

The cooling fan 31 serves to introduce cooling air through the inlet 11. The cooling fan 31 is composed of at least one, but in the drawings are shown in three each.

The duct 32 is a component that generates a high temperature heat, for example, the power supply 24, ballast 25, lamp 21, etc. are accommodated, and the air generated by the cooling fan 31 It serves as a guide to the front side of the frame (10). In addition, the duct 32 has a structure in which a part of the wall surface is opened so that light emitted from the lamp 21 accommodated in the duct 32 is irradiated into the optical system 20. In addition, the air discharge means 33 having a structure in which the light emitted from the lamp 21 is not visible from the outside at the end of the duct 32. The air discharge means 33 is disposed at the end of the duct 32 adjacent to the exhaust port 12 so as to face the front of the projector. Here, the air discharge means 33 is composed of a plurality of flow guides in the middle bent.

However, in the general projector as described above, since the air including the heat discharged from the inside of the projector is discharged toward the front side, there is a problem of causing the image light emitted toward the front screen through the projection lens 23 to flutter.

The present invention has been made in view of the above, and changes the discharge path of the air discharged from the inside of the projector to prevent the projector of the image light irradiated from the projection lens from the heat contained in the discharged air. The purpose is to provide.

The projector according to the present invention for achieving the above object includes a frame having an intake port and an exhaust port, an optical system in which an image is formed, and a cooling device for cooling the heat generated therein. At least one cooling fan through which cooling air is introduced; A duct for receiving a high temperature heat generating element and directing air generated by the cooling fan to the front side of the frame; And a flow path changing means for changing the path of the air guided by the duct to the side of the frame and discharging it to the exhaust port.

According to a preferred embodiment of the present invention, it is preferable that the flow path changing means includes a plurality of flow path guides which are bent and extended in the lateral direction from the front direction.

In addition, the component that generates the high temperature heat is a lamp, it is also possible to further include one or more of the power supply and ballast.

The above objects and other features of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. For reference, in the following description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

As shown in FIG. 2, a projector according to an embodiment of the present invention includes a frame 100, an optical system 200, and a cooling device 300 for cooling heat generated therein.

The frame 100 serves to form the exterior of the projector, and the inlet port 110 and the exhaust port 120 are provided at a predetermined position. The inlet port 110 and the exhaust port 120 is composed of a plurality of air holes to be the access passage of the air. In addition, the inlet port 110 and the exhaust port 120 are formed on the outer surface of the frame 100.

The optical system 200 forms an image that is projected onto the screen. In the figure, the lamp 210, the DMD 220 and the projection lens 230 are shown. The lamp 210 has a high output discharge lamp so that the brightness of the projected image is good. The DMD 220 is an optical modulator for modulating the light incident from the lamp 210 according to image data to form image light having image information. The image light is projected on the screen by the projection lens 230. Although not shown, the optical system 200 may further include optical elements such as a color wheel and a reflector. The detailed structure and operation principle of the optical system 200 are well known to those skilled in the art, and thus detailed description thereof will be omitted.

A power supply 240 for supplying power to the projector is disposed behind the DMD 220, and a ballast 250 for operating the lamp 210 is disposed at one side of the power supply 240.

The cooling device 300 serves to cool the heat generated inside the projector and includes a cooling fan 310, a duct 320, and a flow path changing means 330.

The cooling fan 310 serves to introduce air from the outside through the inlet port 110. The cooling fan 310 is made of at least one. In the drawing, the cooling fan 310 is illustrated as a first cooling fan 311, a second cooling fan 312, and a third cooling fan 313. The first cooling fan 311 is disposed behind the DMD 220, and serves to cool the DMD 220. The second cooling fan 312 is disposed between the power supply 240 and the ballast 250 to allow air to flow from the power supply 240 toward the ballast 250. The third cooling fan 313 is disposed between the ballast 250 and the lamp 210 to allow air to flow from the ballast 250 toward the lamp 210. However, the arrangement of the cooling fan 310 is not limited thereto, and the number of the cooling fans 310 may be increased or decreased as necessary, and the arrangement position may be changed.

The duct 320 accommodates a component that generates high heat, for example, a power supply 240, a ballast 250, a lamp 210, and the like, and generates air generated by the cooling fan 310. It serves to guide the front side of the frame 100. Here, the power supply 240, ballast 250, the lamp 210 is arranged in series on the path of the air is cooled in order due to the air guided by the plurality of cooling fans 310. However, the components accommodated in the duct 320 are not limited thereto. Rather, only the lamp 210, which is the component operating at the highest temperature in the projector, may be separately received. The duct 320 is provided with an intake hole 321 and a light hole 322. The intake hole 321 is provided to be adjacent to the intake port 110 to allow external air to flow into the duct 320. The light hole 322 has a structure in which a part of the wall surface is opened so that light emitted from the lamp 210 received by the duct 320 is irradiated into the optical system 200.

As shown in FIG. 3, the flow channel changing means 330, which is the subject matter of the present invention, changes the air induced by the duct 320 from the front direction of the frame 100 to the lateral direction. ) To discharge. The flow path changing means 330 is disposed adjacent to an end of the path of the duct 320. Here, the flow path changing means 330 includes a plurality of flow path guides 333 which are bent in a lateral direction from the front direction to extend. Therefore, the flow path guide 333 is provided with at least one bent portion that is changed in the traveling direction. Due to this structure, the cooling air inside the projector is completed, and the air containing heat is discharged to the side rather than the front side. In addition, the flow path changing means 330 is composed of an upper bracket 331 and a lower bracket 332 coupled to the lower side of the upper bracket 331. Upper flanges 334 are formed at predetermined positions of the upper bracket 331, and lower flanges 335 are formed at the lower brackets 332 to face the upper flanges 334, respectively. The upper flange 334 and the lower flange 335 are fastened by screws to complete the flow path changing means 330. In addition, the lower bracket 332 is provided with a fixing flange 336 at a predetermined position such that the flow path changing means 330 is fixed to the duct 320.

In the projector according to the present invention configured as described above, the air introduced into the interior from the outside of the frame 100 is the intake port 110-intake hole 321-duct 320-flow path changing means 330-exhaust port 120 While passing through the power supply 240, the ballast 250, the lamp 210 is sequentially cooled and discharged to the side of the frame 100.

The present invention has been described in an exemplary manner. The terminology used herein is for the purpose of description and should not be regarded as limiting. Many modifications and variations of the present invention are possible in light of the above teachings. Accordingly, the invention may be freely practiced within the scope of the claims unless otherwise stated.

As described above, the projector according to the present invention has an effect of obtaining an appropriate image because the cooled air is discharged to the side, so that the path of the image light irradiated from the projection lens is not disturbed by heat.

Claims (4)

A frame having an inlet and an exhaust port, an optical system in which an image is formed, and a cooling device for cooling heat generated therein, wherein the cooling device includes: At least one cooling fan for introducing cooling air through the inlet port; A duct for receiving a high temperature heat generating element and directing air generated by the cooling fan to the front side of the frame; And And a flow path changing means for changing the path of the air guided by the duct to the side of the frame and discharging it to the exhaust port. The method of claim 1, The flow path changing means includes a plurality of flow path guides which are bent and extended from the front direction to the lateral direction. The method of claim 1, And the component that generates the high temperature heat is a lamp. The method of claim 4, wherein The high temperature heat generating component is a projector characterized in that it further comprises one or more of the power supply and ballast.

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