CN1705910A - Lighting system, and projector - Google Patents

Abstract

The projector of the present invention is a projector that includes a light source device (411), an optical device (44) that modulates the light beam emitted from the light source device (411) to form an optical image according to image information, and an outer casing (2) that houses the light source device (411) and the optical device (44), and that enlarges the optical image formed by the projection optical device (44). The projector includes: feet (26, 27) that are configured to extend and retract from the outer peripheral surface of the outer casing (2) to adjust the projection position of the enlarged projection optical image; an air intake opening (30) formed on the surface of the outer casing (2) on which the feet (26, 27) are provided; and an air intake fan (63) provided near the air intake opening (30) inside the outer casing (2) to introduce cooling air from the outside of the outer casing (2), wherein the air intake surface (63A) of the air intake fan (63) is arranged obliquely relative to the surface of the outer casing (2) on which the air intake opening (30) is formed.

Description

lighting fixtures, projectors

technical field

The present invention relates to a projector that includes a light source, a light modulation device that modulates a light beam emitted from the light source to form an optical image based on image information, and a housing that accommodates the light source and the light modulation device, and that expands and projects the optical image formed by the light modulation device. .

Background technique

In the past, people have used projectors that modulate light beams emitted from a light source according to image information to perform enlarged projection. In recent years, such projectors have been used for demonstrations on personal computers in companies and for various purposes such as watching movies at home. used.

Such a projector includes an optical device for forming an optical image, a light source, a power supply circuit for supplying power to them, and a lamp driving circuit, and houses them in a housing.

Here, the light source, power supply circuit and lamp driving circuit are heat sources that generate heat inside the box during operation, while the optical components and light modulation devices that constitute the optical device contain components that are afraid of heat. For this reason, in the projector, just be provided with the cooling system that introduces cooling air from the outside of the box to cool the various components inside the box.

As described in JP-A-2000-330202 (FIGS. 5 and 8) and JP-A-2000-10191 (FIG. 1), cooling systems can be classified into cooling systems for optical systems including optical devices. , light source cooling system, power supply and light source drive circuit cooling system, in the past, the power supply and light source drive circuit cooling system was supplied with air after passing through the cooling system of the optical system, these circuits were cooled, and finally the exhaust An air fan discharges to the outside (for example, refer to Patent Document 1 and Patent Document 2).

Contents of the invention

However, if the structure of such an existing cooling system is used, the air after cooling the optical system is used as the cooling air for the circuit, so the power supply circuit and the light source driving circuit cannot be cooled with high efficiency. A method for more efficiently cooling power supply circuits and light source drive circuits is desired.

On the other hand, although it is also conceivable to independently install the flow paths for cooling these circuits, in order to effectively cool the inside of the box, it is necessary to form a cooling flow path from the front of the box to the back. A suction fan is installed, and an exhaust fan is installed on the back side of the device. Therefore, the suction fan for cooling the circuit and the fan installed in the cooling flow path of other components interfere with each other, and the downsizing of the projector cannot be promoted.

It is an object of the present invention to provide a projector capable of efficiently cooling components inside a housing including the above-mentioned power supply circuit, light source drive circuit, etc., and promoting miniaturization.

The projector of the present invention includes: a light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, and a housing for accommodating the light source and the light modulation device, and expands and projects images formed by the light modulation device. The optical image is characterized in that: it includes: a foot that is provided so as to be able to expand and contract from the outer peripheral surface of the above-mentioned box to adjust the projection position of the enlarged and projected optical image; an air intake opening; and an air intake fan disposed near the air intake opening inside the box and introducing cooling air from the outside of the box, wherein the air intake surface of the air intake fan is opposite to where the air intake opening is formed The surface of the above-mentioned box of the part is arranged obliquely.

Here, as the suction fan, various fans such as an axial fan and a Sirocco fan can be used, but it is desirable to arrange the suction fan so that the suction surface of the suction fan faces the suction opening.

If adopt the present invention, owing to be to be provided with the air suction opening portion on the face of the box body that is provided with foot portion, and from here directly introduce the composition of external air by means of suction fan, so each fan can respectively suck air to cool. The object delivers sufficient cooling air without interfering with other cooling air flows sucked in by other fans in the box, and also prevents the occurrence of turbulent flow caused by the influence of each fan, and prevents noise. In addition, since the air intake opening is disposed on the surface of the housing on which the legs are provided and the air intake fan is disposed in the vicinity thereof, it is easy to reduce the size of the projector in plan view.

In addition, since the air intake surface of the air intake fan is arranged obliquely with respect to the surface of the housing on which the air intake opening is formed, even when the projector is placed on an installation stand or the like so that the air intake opening is close to the surface of the installation stand, , the suction surface of the suction fan can also be arranged at a predetermined distance from the surface of the setting table, and a space is ensured near the suction surface 63A of the suction fan 63, so the suction fan can reliably introduce sufficient air into the inside of the box. Cooling the air, moreover, turbulent flow in the vicinity of the suction fan 63 can be prevented and noise can be prevented. That is, even when the suction surface of the suction fan is close to the surface of the installation table, it is possible to prevent the airflow from being blocked by the housing with the rotation of the suction fan to reduce the suction amount and prevent friction noise from being generated.

In addition, since the suction fan is arranged at a distance from the suction opening formed in the casing by arranging the suction fan obliquely with respect to the surface of the casing, the noise accompanying the rotation of the suction fan is less likely to be generated. Leakage to the outside of the cabinet will improve the quietness of the projector.

In the present invention, preferably, when the projector includes a power supply circuit for supplying power to the light source and the light modulation device, and a light source driving circuit for driving the light source, the suction fan may be used for Cooling the above-mentioned power supply circuit and the cooling flow path of the light source driving circuit.

If the present invention is adopted, since the cooling air can be directly introduced from the outside of the box body to cool the power supply circuit and the light source driving circuit as heat sources, these circuits can be effectively cooled.

In the present invention, it is desirable to set a cooling flow path for cooling air introduced by the above-mentioned suction fan independently from other cooling flow paths.

If the present invention is adopted, since the cooling systems of the power supply circuit and the light source driving circuit are independent from other cooling systems, these circuits can be cooled more effectively, and the cooling efficiency of other cooling systems can also be improved. The heat will not affect other cooling systems.

In the present invention, it is preferable that the cooling flow path is configured such that the cooling air flows along the inner surface of the housing in which the intake opening is formed.

According to the present invention, the cooling channels of the power supply circuit and the light source driving circuit can be reliably independent from other cooling channels.

In the present invention, it is preferable that the above-mentioned cooling channels of the power supply circuit and the light source driving circuit are divided by plate-shaped bodies standing upright from the inner surface of the case.

Here, it is desirable that the plate-like body is provided integrally with the case on the inner surface of the case, and in the case of a case made of resin, for example, it may be provided integrally by injection molding or the like.

According to the present invention, the cooling flow path can be completely independent from other cooling flow paths by dividing the cooling flow path into regions by the plate-shaped body, so that the power supply circuit and the light source driving circuit can be cooled more effectively.

In the present invention, it is desirable to supply the cooling air from the suction fan into the respective air guide bodies when the power supply circuit and the light source driving circuit are respectively enclosed by cylindrical air guide bodies.

Here, although various structures that can surround these circuit boards can be used for the air guide body, it is ideal to form the air guide body with metal to improve heat dissipation, and to give the circuit board an electromagnetic shielding function. Air guide body.

In addition, the amount of cooling air introduced to each air guide body can be adjusted by adjusting the inclination angle of the exhaust surface of the suction fan relative to the opening end of the cylindrical air guide body and/or the suction side of each air guide body. The shape of the opening of each wind guide body and/or the shape of the opening of the exhaust side of each air guide body is changed.

If the present invention is adopted, the inclination angle of the exhaust surface of the suction fan and/or the shape of the opening on the suction side of each air guiding body and/or the The shape of the opening on the exhaust side of one air guide body allows cooling air to be introduced into each air guide body in proportion, so that the cooling efficiency of these circuit boards can be further improved.

In addition, since the air guide body is made of metal, heat dissipation can be improved, and it can also have the function of electromagnetic shielding, so it is no longer necessary to take EMI countermeasures for the power supply circuit and light source drive circuit, and the internal structure of the projector can be simplified.

In this invention, it is preferable that the said suction fan is attached to the said air guide body.

If the present invention is adopted, since the air suction surface of the air suction fan is arranged obliquely relative to the surface of the box, it is not necessary to additionally provide a support member for the air suction fan on the inner surface of the box, so the internal structure of the projector can be further simplified. , which is ideal for miniaturization of the device.

In the present invention, it is preferable that the air intake opening is a first air intake opening, that the air intake fan is a first air intake fan, and that the air in the box is provided on the side surface of the box to blow the air inside the box to the above-mentioned air intake fan. The exhaust opening for discharging from the outside of the box includes: a second air intake opening provided on the box body separately from the first air intake opening; disposed near the second air intake opening, The second suction fan that introduces cooling air from the outside of the above-mentioned box; by the above-mentioned second suction fan from the above-mentioned second suction opening, the air outside the above-mentioned box is introduced into the inside of the above-mentioned box, and it flows to the above-mentioned exhaust The first cooling system that cools the above-mentioned light modulator and the above-mentioned light source through the above-mentioned first air suction fan from the above-mentioned first air suction fan The opening part introduces the air outside the above-mentioned case into the inside of the above-mentioned case, makes it flow to the above-mentioned exhaust opening and is discharged from the above-mentioned exhaust opening to the outside of the above-mentioned case, so as to cool the above-mentioned power supply circuit and the above-mentioned light source drive. 2nd cooling system for the circuit.

If the present invention is adopted, since the first cooling air flow and the second cooling air flow after effectively cooling each heat source inside the projector through the independent air flow can be discharged from the common exhaust opening, it can be simplified. The shape of the box body, moreover, it is easy to manage the discharge direction of the air.

In the present invention, it is preferable that the first cooling air flow and the second cooling air flow are discharged from respective regions within the exhaust opening.

If the present invention is adopted, since the first cooling air flow and the second cooling air flow can be discharged from different areas in the exhaust opening, even when the first cooling air flow and the second cooling air flow are discharged, it is not necessary to discharge the first cooling air flow. Exhausted in an interfering manner, the interior of the projector can be effectively cooled.

In the present invention, it is preferable that the power supply circuit is arranged in the first cylindrical air guide; the light source driving circuit is arranged in the second cylindrical air guide; a part of the second cooling air flow is introduced into the first air guide. In the air guiding body, another part of the second cooling air flow is introduced into the second air guiding body; the air flow flowing from the first air guiding body and the air flow flowing from the second air guiding body are in the The exhaust openings are exhausted from the respective areas.

According to the present invention, since the power supply circuit and the light source driving circuit can be cooled with separate cooling air flows, and the air after each cooling can be discharged from different areas in the exhaust opening, The power supply circuit and the light source driving circuit can be cooled more effectively without the respective air flows interfering.

In the present invention, it is preferable that the air intake surface of the first air intake fan is arranged obliquely so as to be away from the first air intake opening as it approaches the exhaust opening.

If the present invention is adopted, since the air intake surface of the first air intake fan is arranged in the direction opposite to the air flow that has been heated up due to cooling other heat source parts inside the projector, it is possible to prevent the first air intake from being blown. The fan sucks in the warmed air inside the projector and can draw in more of the cooler air outside the projector.

Description of drawings

FIG. 1 is a schematic perspective view showing an appearance configuration of a projector according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view showing the external configuration of the projector of the above embodiment;

FIG. 3 is a schematic perspective view showing the internal configuration of the projector of the above embodiment;

FIG. 4 is a schematic perspective view showing the internal configuration of the projector of the above embodiment;

5 is a schematic diagram showing the structure of the optical system of the projector of the above-mentioned embodiment;

FIG. 6 is a schematic perspective view showing the configuration of the power supply circuit of the above embodiment;

7 is a schematic perspective view showing the configuration of the light source drive circuit of the above embodiment;

FIG. 8 is a perspective view showing the configuration of the power supply circuit of the above embodiment;

FIG. 9 is a side view showing the structure of the power supply circuit of the above embodiment;

10 is a cross-sectional view showing the configuration of the power supply circuit and the light source driving circuit of the above embodiment;

FIG. 11 is a schematic perspective view showing a cooling system of the projector of the above embodiment;

Fig. 12 is a schematic perspective view showing the configuration of the light source driving circuit of the above embodiment.

Detailed ways

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

(1) Appearance composition

1 and 2 show a projector 1 according to an embodiment of the present invention. FIG. 1 is a perspective view viewed from the upper front side, and FIG. 2 is a perspective view viewed from the lower rear side.

This projector 1 is an optical device that modulates a light beam emitted from a light source according to image information, and projects it on a projection surface such as a screen by expanding it. The projection lens 3 exposed from the casing 2.

The projection lens 3 has the function of a projection optical system that expands and projects the optical image formed by modulating the light beam emitted from the light source by means of the light modulation device according to the image information and synthesizing the modulated light beam by means of the light synthesis device, which will be described later. It is constructed as a combined lens that accommodates multiple lenses inside the lens barrel.

As the outer casing 2 of the box, it is formed so that the dimension in the width direction perpendicular to the projection direction is larger than the projection direction dimension in a wide rectangular parallelepiped shape, and is provided with an upper casing 21 covering the upper part of the device body, and covering the upper part of the device body. The lower casing 2 which covers the lower part, and the front casing 23 which covers the front part of the device body. These respective casings 21 to 23 are integral molded products made of synthetic resin molded by injection molding or the like.

The upper case 21 is provided with: an upper part 21A covering the upper part of the device main body, side parts 21B and 21C substantially hanging down from the widthwise end of the upper part 21A, and substantially hanging down from the rear end of the upper part 21A. Down the back part 21D.

An operation panel 24 for performing start-up and adjustment operations of the projector 1 is provided on the front side in the projection direction of the upper surface portion 21A. The operation panel 24 is equipped with a plurality of switches including a start switch, an image-sound adjustment switch, etc. When the projector 1 is projecting, by operating the adjustment switches on the operation panel 24, etc., the image quality, Adjustment of volume etc.

In addition, a plurality of holes 241 are formed adjacent to the operation panel 24 of the upper surface 21A, and a speaker (not shown) for sound output is accommodated therein.

The operation panel 24 and the speaker are electrically connected to a control board constituting the main body of the device described later. Operation signals obtained from the operation panel 24 are processed by this control board.

On the rear portion 21D, a recessed portion notched on the upper portion 21A side is formed substantially in the center, and a connector group 25 provided on an interface board connected to a control board described later is exposed in the recessed portion.

The lower housing 2 is substantially symmetrical about the joint surface with the upper housing 21 and includes a bottom surface 22A, side surfaces 22B and 22C, and a rear surface 22D. In addition, the side parts 22B, 22C and the back part 22D are joined at the upper end parts with the lower end parts of the side parts 21B, 21C and the back part 21D of the upper cabinet 21, and constitute the side part and the back part of the exterior cabinet 2.

On the bottom portion 22A, a fixed leg portion 26 is provided at a substantially central portion on the rear end side of the projector 1 , and adjustment leg portions 27 are provided at both ends in the width direction on the front end side.

The adjustment leg portion 27 is constituted by a shaft-shaped member freely protruding in the outward direction from the bottom portion 22A, and the shaft-shaped member itself is housed inside the exterior cabinet 2 . Such an amount of expansion and contraction (advancement and retreat) of the adjustment leg portion 27 from the bottom surface portion 22A can be adjusted by operating the adjustment button 271 provided on the side portion of the projector 1 .

In this way, the vertical position of the projected image emitted from the projector 1 can be adjusted, and the projected image can be formed at an appropriate position.

In addition, openings 28 , 29 , and 30 communicating with the inside of the exterior cabinet 2 are also formed on the bottom surface portion 22A.

The opening 28 is a portion for attaching and detaching the light source device 411 including the light source of the projector 1 , and is normally closed with a cover 281 .

The openings 29 and 30 are configured as slit-shaped openings.

The opening 29 is an intake opening for cooling the cooling air of the optical device 44 including the liquid crystal panel as a light modulation device that modulates light beams emitted from the light source lamp according to image information.

The opening 30 is an intake opening for sucking cooling air for cooling a power supply unit constituting the main body of the projector 1 .

In addition, since the openings 29 and 30 communicate with the inside of the projector 1 at their slit-shaped openings, dust-proof filters are respectively provided inside to prevent dust and the like from entering the inside.

In addition, on the bottom surface 22A, there is also provided a cover member 31 that is slidably attached to the outside with respect to the bottom surface 22A, and is configured so that a remote controller for remotely operating the projector 1 can be housed in the cover member 31. internal. In addition, in the remote controller not shown, the same switches as the start switch and the adjustment switch etc. which are provided on the above-mentioned operation panel 24 are provided. Corresponding to the infrared signal, the infrared signal can be processed by the control board through the light receiving part 311 provided on the front and back of the external casing.

On the back portion 22D, as in the case of the upper case 21, a concave portion cut out on the bottom portion 22A side is formed in the substantially central portion, and the connector group 25 provided on the above-mentioned interface board is exposed. An opening portion 32 is also formed near the portion, and the input connector 33 is exposed from the opening portion 32 . The input connector 33 is a terminal for supplying power from an external power source to the projector 1, and is to be electrically connected to a power supply unit described later.

The front cabinet 23 is configured to include a front part 23A, an upper part 23B, and a lower part 23C, and the rear end side of the upper part 23B in the projection direction is joined to the front end part of the above-mentioned upper cabinet 21 in the projection direction. The projection direction rear end side of 23C is joined to the projection direction front end portion of the above-mentioned lower cabinet 22 .

A substantially circular opening 34 for exposing the projection lens 3 and an opening 35 formed of a plurality of slits formed adjacent to the front portion 23A are formed.

The upper side of the opening 34 is also opened to expose a part of the lens barrel of the projection lens 3 so that the zoom-focus adjustment knobs (handles) 3A, 3B provided around the lens barrel can be operated from the outside.

The opening 35 is configured as an exhaust opening for discharging the air cooled to the main body of the device, and from this opening 35 toward the projection direction of the projector 1, the optical system and control components of the projector 1, which will be described later, are exhausted. Air for cooling the system and power supply unit.

(2) Internal composition

As shown in FIGS. 3 to 5 , the device body of the projector 1 is housed inside such an exterior case 2 , and the device body is configured to include the optical unit 4 shown in FIG. 3 , the control board 5 and The power supply unit 6.

(2-1) Configuration of the optical unit 4

The optical unit 4 is a unit that adjusts the light beam emitted from the light source device 411 to form an optical image according to image information, and forms a projected image on the screen through the projection lens 3. It is configured to assemble the light source device 411 and various optical components into the figure 4, the housing for optical components such as the optical waveguide 40 is used.

The optical waveguide 40 is composed of a lower optical waveguide 401 and an upper optical waveguide not shown in FIG. 4, each of which is a synthetic resin product formed by injection molding or the like.

The lower optical waveguide 401 is formed in a container shape with an opening at the top consisting of a bottom portion 401A for accommodating optical components and a side wall portion 401B, and a plurality of groove portions 401C are provided on the side wall portion 401B. Various optical components constituting the optical unit 4 are fitted into the groove portion 401C, whereby each optical component can be precisely arranged on the illumination optical axis provided in the optical waveguide 40 . The upper optical waveguide has a planar shape corresponding to the lower optical waveguide 401 , and is configured as a cover-shaped member covering the upper surface of the lower optical waveguide 401 .

In addition, a front wall having a circular opening is provided on the beam exit side end of the bottom surface portion 401A of the lower waveguide 401A, and the base end portion of the projection lens 3 is fixed to the front wall.

In such an optical waveguide 40, as shown in FIG. 5 , it can be roughly divided functionally into an integral illumination optical system 41, a color separation optical system 42, a relay optical system 43, and an integrated light modulation optical system and color synthesis optical system. The optical device 44. In addition, the optical unit 4 of this example is a unit used in a three-plate projector, and is configured as a spatial color separation type optical unit that separates the light beam emitted from the integral illumination optical system 41 into three colored lights in the optical waveguide 40. unit.

The integral illumination optical system 41 is an optical system that converts the light beam emitted from the light source into a light beam with uniform illuminance in a plane perpendicular to the illumination optical axis, and is configured to include a light source device 411, a first lens array 412, a second lens array 413 , polarization conversion element 414 and overlapping lens 415 .

The light source device 411 includes a light source lamp 416 as a radiation light source and a reflector 417, and the reflector 417 reflects the radial light rays emitted from the light source lamp 416 into substantially parallel light rays and emits them to the outside. In this example, a high-pressure mercury lamp is used as the light source lamp 416, but a metal halide lamp or a halogen lamp may be used instead. In addition, in this example, a parabolic mirror is used as the reflector 417, but a configuration in which a parallelizing concave lens is arranged on an emission surface of a reflector composed of an elliptical mirror may also be adopted.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline viewed from the direction of the illumination optical axis are arranged in a matrix. Each small lens divides the light beam emitted from the light source lamp 416 into partial light beams, and emits them in the direction of the illumination optical axis. The contour shape of each small lens is set to be substantially similar to the shape of the image forming region of the liquid crystal panel 441 described later. For example, if the aspect ratio (the ratio of the horizontal and vertical dimensions) of the image forming region of the liquid crystal panel 441 is 4:3, the aspect ratio of each small lens is also set to 4:3.

The configuration of the second lens array 413 is substantially the same as that of the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 413 has a function of forming an image of each small lens of the first lens array 412 on the liquid crystal panel 441 together with the overlapping lens 415 .

The polarization conversion element 414 converts the light from the second lens array 413 into one type of polarized light, thereby improving the utilization efficiency of light in the optical device 44 .

Specifically, the partial light beams converted into one type of polarized light by the polarization conversion element 414 are finally substantially superimposed on the liquid crystal panel 441 of the optical device 44 by the superimposing lens 415 . In a projector using a liquid crystal panel 441 that modulates polarized light, only one type of polarized light can be used, so almost half of the light beam from the light source lamp 416 that emits random polarized light cannot be used. Therefore, by using the polarization conversion element 414, all the light beams emitted from the light source lamp 416 are converted into one type of polarized light, thereby improving the light utilization efficiency in the optical device 44. In addition, such a polarization conversion element 414 is described in, for example, JP-A-8-304739.

The color separation optical system 42 is equipped with two dichroic mirrors 421, 422 and a reflection mirror 423, and has the function of separating a plurality of partial light beams emitted from the integral illumination optical system 41 into red (R) and green ( G), blue (B) the function of these 3 color shades.

The relay optical system 43 includes an incident side lens 431 , a relay lens 433 , and reflection mirrors 432 and 434 , and has a function of guiding red light, which is the color light separated by the color separation optical system 42 , to the liquid crystal panel 441R.

At this time, in the dichroic mirror 421 of the color separation optical system 42 , among the light beams emitted from the integrating illumination optical system 41 , the red light component and the green light component are transmitted, and the blue light component is reflected. The blue light reflected by the dichroic mirror 421 is reflected by the reflector 423 , passes through the field lens 418 , and reaches the liquid crystal panel 441B for blue. The field lens 418 converts each partial beam emitted from the second lens array 413 into a beam parallel to its central axis (chief ray). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441R.

Furthermore, among the red light and the green light that have passed through the dichroic mirror 421 , the green light is reflected by the dichroic mirror 422 , passes through the field lens 418 , and reaches the liquid crystal panel 441G for green. On the other hand, the red light passes through the relay optical system 43 after passing through the dichroic mirror 422 , passes through the field lens 418 , and reaches the liquid crystal panel 441R for red light. In addition, the reason why the relay optical system 43 is used for red light is because the optical path length of red light is longer than that of other colored lights, and the reduction of light utilization efficiency due to light divergence and the like is to be prevented. That is, it is because the partial light beam incident on the incident-side lens 431 propagates toward the field lens 418 as it is. In addition, although the relay optical system 43 is configured to pass red light among the three color lights, it is not limited thereto, and may be configured to pass blue light, for example.

The optical device 44 modulates the incoming light beams according to the image information to form a color image, and is provided with: three incident-side polarizing plates 442 that are incident on the light of each color separated by the color separation optical system 42, and are arranged on the rear stage of each incident-side polarizing plate 442. Liquid crystal panels 441R, 441G, and 441B as light modulators, exit-side polarizers 443 disposed after each of the liquid crystal panels 441R, 441G, and 441B, and cross dichroic prisms 444 as a color synthesis optical system.

The liquid crystal panels 441R, 441G, and 441B, for example, use polysilicon TFTs as switching elements, although the illustration is omitted, but they are configured so that the panel main body in which the liquid crystal is hermetically sealed in a pair of oppositely arranged transparent substrates is accommodated in the holding frame. Inside.

In the optical device 44, each color light separated by the color separation optical system 42 is modulated according to the image information to form an optical image by means of the three liquid crystal panels 441R, 441G, 441B, the incident side polarizer 442 and the exit side polarizer 443. .

Of the color lights separated by the color separation optical system 42, the incident-side polarizing plate 442 transmits only the polarized light in a constant direction and absorbs other light beams, and is formed by affixing a polarizing film to a substrate such as sapphire glass. In addition, it is also possible to stick a polarizing film on the field lens 418 without using a substrate.

The output-side polarizing plate 443 also has substantially the same configuration as the incident-side polarizing plate 442, and transmits only the polarized light in a predetermined direction among the light beams emitted from the liquid crystal panel 441 (441R, 441G, 441B), and absorbs the other light beams. Beam. In addition, it is also possible to stick a polarizing film on the cross dichroic prism 444 without using a substrate.

These incident-side polarizing plates 442 and exit-side polarizing plates 443 are set such that the directions of their polarization axes are perpendicular to each other.

The cross dichroic prism 444 synthesizes the optical images emitted from the output-side polarizing plate 443 and modulated for each color light to form a color image.

In the cross dichroic prism 444, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are arranged in a substantially X shape along the interfaces of the four rectangular prisms, and 3 dielectric multilayer films are synthesized by means of these dielectric multilayer films. Shade.

In such an optical device 44, a panel fixing plate having pins (pins) protruding outward at four corners of a rectangular plate-shaped body is attached to each beam incident end face of the cross dichroic prism 444, and the The liquid crystal panels 441R, 441G, and 441B can be integrated by inserting respective pins into holes formed in the holding frames.

Then, the integrated optical device 44 is arranged on the optical path preceding stage of the projection lens 3 of the above-mentioned optical waveguide 40 , and screwed (screws) to the bottom surface of the lower optical waveguide 401 .

(2-2) Structure of the control board 5

The control board 5, as shown in FIG. 3, is configured to cover the upper side of the optical unit 4, and includes: a main board 51 on which an arithmetic processing device and an IC for driving a liquid crystal panel are mounted; The interface boards 52 are connected and stand up on the rear surfaces 21D and 22D of the exterior cabinet 2 .

The above-mentioned connector set 25 is mounted on the back side of the interface board 52 , and image information input from the connector set 25 is output to the main board 51 through the interface board 52 .

The arithmetic processing unit on the main substrate 51 performs arithmetic processing on the input image information, and then outputs control commands to the IC for driving the liquid crystal panel. The driving IC generates an output driving signal according to the control command to drive the liquid crystal panel 441, so that light modulation can be performed according to image information to form an optical image.

Such a main substrate 51 is covered with a metal plate 53 formed by bending punched metal, and the metal plate 53 is provided to prevent EMI (electromagnetic interference) generated by circuit elements and the like on the main substrate 51 .

(2-3) Structure of the power supply unit 6

The power supply device 6 includes a power supply unit 61 having a power supply circuit shown in FIG. 6 , and a lamp driving unit 62 having a light source driving circuit shown in FIGS. 7 and 12 disposed below the power supply unit 61 . FIG. 12 is a diagram showing the lamp driving unit 62 mounted on the lower cabinet 22 . FIG. 7 shows a state where the air guide member 65 of FIG. 12 is penetrated.

The power supply unit 61 supplies the above-mentioned lamp driving unit 62 or the control board 5 with electric power supplied from the outside through a power supply cable not shown connected to the above-mentioned input connector 33 .

The power supply unit 61 is configured to include a main body substrate 611 and a metal cylindrical body 612 surrounding the main body substrate 611 as shown in FIG. 8 .

The cylindrical body 612 has a hollow substantially box-like shape, and has an opening 612h in a portion of the bottom surface on the side of one end surface 612f, and an opening is formed in the other end surface 612g.

The lower ends of the two side surfaces on the other end surface 612g side of the cylindrical body 612 are bent outward in a horizontal direction, and holes 612A and 612B are formed in the horizontal portion. It is also bent outward and formed with a hole 612C. In addition, the cylindrical body 612 is desirably made of metal. With this, in addition to the function as an air guide member for flowing cooling air, EMI can be prevented like the sheet metal 53 of the control board 5 .

A side surface portion on one end surface 612f side of the cylindrical body 612 extends downward, and an air intake fan 63 is attached between the extended portions, that is, inside the opening portion 612h.

This suction fan 63 is installed obliquely as shown in FIG. A part faces the inside of the cylindrical body 612 .

The lamp driving unit 62 is a conversion circuit for supplying electric power to the above-mentioned light source device 411 with a stable voltage. It is supplied to the light source device 411 after becoming a DC current or an AC square wave current.

This lamp drive unit 62, as shown in FIG. 7 and FIG. Part 65. In addition, the lamp driving unit 62 is arranged so as to partially intersect with the above-mentioned power supply unit 61 .

In the air guide member 65, an opening 65a for introducing cooling air is formed on a portion adjacent to the opening 30 on the side surface, and an opening 65a near the opening 65a is formed on the side surface opposite to the side forming the opening 65a. Openings 65 b are formed near the diagonal corners.

Such a power supply unit 61 and a lamp driving unit 62 are fixed to the lower cabinet 22 as shown in FIGS. 6 , 10 and 12 .

First, the lamp driving unit 62 is fixed to the bottom surface portion 22A of the lower cabinet 22 by the resin rivet 62 a in a state surrounded by the wind guide member 65 . In addition, the lamp driving unit 62 may be fixed to the bottom surface portion 22A by screws (screws) instead of the rivets 62 a.

In addition, the lamp driving unit 62 is also surrounded by a plurality of plate-shaped bodies 64 erected on the inner surface of the bottom surface portion 22A of the lower cabinet 22. At the same time, the plurality of plate-shaped bodies 64 are also arranged to be placed on the bottom surface portion 22A. The formed air intake opening 30 is enclosed, and the space near the opening 30 and the space where the lamp driving unit 62 is disposed are separated from other spaces in the lower cabinet 22 by the plurality of plate-like bodies 64 .

In addition, the plurality of plate-like bodies 64 are formed integrally at the same time during the injection molding of the lower housing 22 . Next, the power supply unit 61 is disposed on the upper portion of the lamp driving unit 62 so as to cross a part of the lamp driving unit 62 in plan view, and the screw hole 64a (see FIG. 7 ) formed on the upper portion of the plate-like body 64 and After the holes 612A to 612C (see FIG. 8 ) formed in the cylindrical body 612 of the power supply unit 61 are aligned, they are fixed to the upper part of the plate-shaped body 64 (see FIG. 10 ) by means of screws 64b.

At this time, the suction fan 63 provided on the cylindrical body 612 is arranged so as to be slightly separated from the opening 30 formed in the bottom surface portion 22A in a state surrounded by the plurality of plate-shaped bodies 64, and then, Furthermore, the air suction surface 63A of the air suction fan 63 is disposed obliquely with respect to the bottom surface 22A so as to approach the bottom surface 22A as it advances toward the projection direction of the projector 1 .

In this example, in the cooling system A described later, since the cooled air is exhausted on the front side of the projector 1, such an inclined arrangement is made. In the case of exhaust, it is desirable to change the inclination to the opposite direction. In short, the air intake fan 63 is ideally disposed at an inclination so that the air intake surface 63A approaches the air intake opening 33 as it approaches the discharge direction of the cooling air flow of the projector 1 , that is, as it approaches the opening 35 . In this way, since it is possible to reduce the possibility that the suction fan 63 sucks the air inside the projector 1 that has been heated up due to cooling other heat source parts, the suction fan 63 can suck air with a low temperature, and the cooling efficiency can be further improved. .

On the other hand, the exhaust surface 63B of the air intake fan 63 is inclined so as to blow air to both the opening 12 h of the cylindrical body 612 and the opening 65 a of the air guide member 65 as shown in FIG. 10 .

Therefore, by means of the structure mentioned above, the opening 30 formed on the casing 2 can be connected to the suction surface 63A of the suction fan 63 with a plurality of plate-shaped bodies 64, and the exhaust surface of the suction fan 63 63B can be connected to one opening 612h of the cylindrical body 612 and one opening 65a of the wind guide member 65 via the cylindrical body 62 and the plurality of plate-shaped bodies 64, respectively. The end face 612g, which is the other opening of the cylindrical body 612, is arranged at a position corresponding to the upper right part of the opening 35 formed in the casing 2 when viewed from the front casing 23 side. The other opening 65b is arranged at a position corresponding to the lower left portion of the opening 35 formed in the casing 2 when viewed from the front casing 23 side, and the exhaust surface 63B of the suction fan 63 and the opening are respectively separated. 35 are connected to form a cooling air flow passage for independently circulating the cooling systems B1 and B2.

In addition, the inclination angle of the exhaust surface 63B of the suction fan 63 and/or the opening of the cylindrical body 612 are adjusted according to the heat generation state of the power supply unit 61 and the lamp driving unit 62 according to the calculated or experimental results. Depending on the shape of the portion 612h and the opening 612g and/or the shape of the opening 65a and the opening 65b of the air guide member 65, the respective air volumes can be adjusted.

(2-4) Structure of exhaust unit

The exhaust unit 8 is arranged on a side portion of the light source device 411 along the exterior cabinet 2 as shown in FIG. 3 .

The exhaust unit 8 includes: a cylindrical exhaust duct 81 , an exhaust fan 82 installed at the end of the exhaust duct 81 on the light source device 411 side, and a front cabinet 23 installed on the exhaust duct 81 . Internal shutters 83 on this side. The exhaust unit 8 exhausts the air that cools the inside of the projector 1 near the light source device 411 and the control board 5 through the exhaust duct 81 through the internal louvers 83 by means of the air blown by the exhaust fan 82 .

The exhaust fan 82 sucks the air that has cooled the projector 1 near the light source device 411 and the control board 5 , and sends the sucked cooling air into the exhaust duct 81 .

This exhaust fan 82 is fixed on the opening of one side of exhaust duct 81 by screw, makes exhaust fan 82 and the opening of one side of exhaust fan 81 close contact, thus cooling air just can not leak out from its connection part. .

The exhaust duct 81 is a cylindrical shape with a substantially rectangular cross-section, and has openings at both ends. One of the openings at both ends is connected to the exhaust surface of the exhaust fan 82, and the other opening is connected to the exhaust surface of the exhaust fan 82. is attached to the interior shutter 83. The other opening portion of the exhaust duct 81 connected to the internal louver 83 is arranged to face the upper left portion of the opening portion 35 when viewed from the front cabinet 23 side.

The internal louver 83 provided on the other opening of the exhaust duct 81 is a rectifying louver having a rectifying function of rectifying the cooling air discharged from the exhaust duct 81 so that the cooling air flows only in a predetermined direction. The plurality of vane plates 831 extending in the vertical direction are arranged substantially parallel to each other.

These vane plates 831 are arranged in parallel in the horizontal direction along the flow path of the cooling air, and partition the other opening of the exhaust duct 81 in the vertical direction. Such an inner louver 83 is arranged at the upper left portion of the opening 35 when viewed from the front cabinet 23 side, and is discharged from the opening 35 in a direction away from the projected image area of the projector 1 by means of the blades 831 . The cooling air of the cooling system A described above.

Such an exhaust unit 8 is fixed to the lower cabinet 22 by screws. That is, the exhaust unit 8 is arranged above the lamp driving unit 62 so as to intersect a part of the lamp driving unit 62 in plan view, and is fixed to the bottom surface 22A of the lower cabinet 22 .

Thereby, the suction port at one end of the exhaust unit 8 faces the light source device 411 , and the exhaust port at the other end of the exhaust unit 8 faces the opening 35 of the front cabinet 23 .

(2-5) Cooling structure

In the above-mentioned projector 1, as shown in FIG. 11, a cooling system A for cooling the optical device 44 and a cooling system B for cooling the power supply unit 6 are provided.

The cooling system A is an air flow of cooling air sucked in from the opening portion 29 (see FIG. 2 ) by means of the suction unit 7 .

The suction unit 7 includes a pair of sirocco fans 71 facing each other across the projection lens 3 and a duct (not shown) that connects the suction surfaces of the pair of sirocco fans 71 to the opening 29 .

The cooling air sucked in directly from the outside of the projector 1 by means of the suction unit 7 is supplied to the bottom of the liquid crystal panels 441R, 441G, and 441B through the sirocco fan 71, and flows along the light beam incident end surface of the cross dichroic prism 444 from It flows upward from the downward direction, and cools the liquid crystal panels 441R, 441G, and 441B, the output-side polarizing plate 443 , and the incident-side polarizing plate 442 .

The cooling air flowing upward of the optical device 44 is bent at right angles to change the direction of the airflow after contacting the main board 51 constituting the control board 5 , and cools various circuit elements mounted on the main board 51 .

The cooling air after cooling the main substrate 51 is collected by the exhaust fan 81 and sent to the exhaust duct 82, and is discharged to the outside of the projector 1 through the opening 35 of the front cabinet 23 (see FIG. 1 ).

Here, when viewed from the front of the projector 1 in FIG. 11 , the sirocco fan 71 arranged on the left side of the projection lens 3 supplies cooling air to the liquid crystal panels 441R and 441B, but part of it is used as the polarization conversion element 414 And the cooling air of the light source device 411.

That is, a part of the cooling air flows through the gap formed between the bottom surface 22A of the lower cabinet 22 and the lower surface of the lower optical waveguide 401, and branches into two directions along the way. One branched cooling air is supplied to the inside of the optical waveguide 40 through the slit hole formed on the lower surface of the lower optical waveguide 401 at the position corresponding to the polarization conversion element 414. After cooling the polarization conversion element 414, it is supplied to the light source. The device 411 cools the light source lamp 416 . The other branched cooling air is directly supplied to the light source device 411 to cool the light source lamp 416 .

Then, the air after cooling the light source unit 411 is collected by the exhaust fan 81 and sent to the exhaust duct 82 to be discharged to the outside of the projector 1 from the opening 35 (see FIG. 1 ) of the front cabinet 23 .

On the other hand, the cooling system B is an air flow of cooling air sucked in from the opening 30 (see FIG. 2 ) by means of the suction fan 63 provided on the power supply unit 61, and includes the cooling system B1 for cooling the power supply unit 61 and the cooling system B1 for cooling the power supply unit 61. Cooling system B2 of lamp driving unit 62 .

This will be described in more detail with reference to FIG. 10 . First, the cooling system B1 supplies a part of the cooling air sucked in directly from the outside of the projector 1 through the opening 30 by the suction fan 63 to the inside of the cylindrical body 612 of the power supply unit 61, and cools the inside of the cylindrical body 612 of the power supply unit 61. After the circuit components on the main body substrate 611, the air flow is discharged to the outside directly from the opening 35 (see FIG. 1 ) formed in the lower cabinet 23 .

On the other hand, the cooling system B2 flows the other part of the cooling air directly sucked in from the outside of the projector 1 through the opening 30 by means of the suction fan 63 to the bottom of the cylindrical body 612 along the plate-shaped body 64, and supplies it to the bottom of the cylindrical body 612. The inside of the air guide member 65 provided on the lamp driving unit 62 cools the circuit components mounted on the substrate 621 of the lamp driving unit 62 and then is exhausted from the lower part of the exhaust duct 82 of the opening 35 to the outside.

As described above, after the cooling system A and the cooling system B directly inhale the outside air by means of the respective separately provided air intake fans 71, 63 to cool the heat generating sources respectively, when viewed from the side of the lower cabinet 23 of the projector 1 , the air from the exhaust pipe 82 of the cooling system A is discharged from the upper left part of the opening part 35, the air from the ventilation member 65 of the cooling system B2 is discharged from the lower left part of the opening part 35, and the air from the ventilation member 65 of the cooling system B2 is discharged from the lower right part of the opening part 35. The air of the cylindrical body 612 of the cooling system B1 is exhausted. Therefore, although the cooling systems A and B both discharge the cooled air from the opening 35 , they are discharged from different regions of the opening 35 .

(3) Effects of Embodiment

According to this embodiment as described above, the following effects can be obtained.

(3-1) Since it is a kind of suction fan 63 from the suction opening 30 formed on the bottom surface portion 22A of the exterior cabinet 2 provided with the fixed leg 26 and the adjustment leg 27, the outside air (outside gas) as the cooling air directly introduced into the composition, due to the cooling air sucked in by the suction fan 63 in the cooling system B, and by other fans in the outer casing 2 such as along the front casing 23 exhaust There is no interference between the fan 81 or other cooling airflow sucked by the sirocco fan 71 along the side portions 21B, 22B, 21C, 22C, so each fan can suck air from its own space and send it to the cooling object. Injecting sufficient cooling air, moreover, it is also possible to prevent the occurrence of turbulent flow caused by the interference of the air flow of each fan, and to prevent noise. In addition, since the suction fan 63 is arranged at the suction opening 30 and its vicinity on the bottom surface portion 22A of the exterior cabinet 2 provided with the fixed leg 26 and the adjustment leg 27, it is easy to realize a plan view of the projector 1. on the miniaturization.

(3-2) Since the air intake surface 63A of the air intake fan 63 is arranged obliquely with respect to the bottom surface portion 22A on which the air intake opening 30 is formed, even when the projector 1 is placed on an installation stand or the like, the opening will not 30 is close to the surface of the setting platform, and the suction surface 63A of the suction fan 63 can also be arranged at a predetermined distance from the surface of the setting platform, thereby ensuring a space near the suction surface 63A of the suction fan 63, so the suction The fan 63 can reliably introduce sufficient cooling air into the interior of the exterior cabinet 2 , and can prevent turbulence generated in the vicinity of the suction fan 63 and prevent noise. That is, even in the state where the suction surface of the suction fan is close to the surface of the installation table, it is possible to prevent the air flow from being blocked by the housing as the suction fan rotates, thereby preventing the suction volume from decreasing and generating friction noise.

(3-3) Since the air intake fan 63 is arranged obliquely with respect to the bottom surface portion 22A of the exterior cabinet 2 so that the air intake fan 63 is separated from the air intake opening 30 by a certain distance, the noise accompanying the rotation of the air intake fan 63 It is difficult to leak to the outside, thereby improving the quietness of the projector 1 .

(3-4) Since the cooling system B can directly introduce cooling air from the outside of the exterior cabinet 2 to cool the power supply unit 61 and the lamp driving unit 62 as heat sources, they can be cooled efficiently.

(3-5) Since the cooling system B for cooling the power supply unit 61 and the lamp driving unit 62 is independent from the other cooling systems A, in addition to cooling these units more effectively, the heat generated in these units is not It will affect other cooling systems, and can also improve the cooling efficiency of other cooling systems A.

(3-6) Since the air intake surface 63A of the air intake fan 63 is arranged obliquely with respect to the surface of the bottom surface portion 22A where the air intake opening 30 is formed, the air sucked up from the vertical direction can flow in the horizontal direction. That is, even the cooling system B that makes the cooling air sucked up from the bottom of the exterior cabinet 2 by means of the suction fan 63 and discharged obliquely upward circulates along the bottom surface portion 22A of the exterior cabinet 2 can be adopted with other cooling systems. A method of forming cooling channels in parallel makes the cooling system B of the power supply unit 61 and the lamp driving unit 62 independent from the other cooling system A reliably. In addition, the cooling system B that circulates along the bottom surface portion 22A of the exterior cabinet 2 can cool a wider range when viewed from a plane.

(3-7) Since the cooling system B is partitioned from other spaces by the plate-shaped body 64, it can be completely independent from the other cooling systems A, so that the power supply unit 61 and the lamp driving unit 62 can be effectively cooled.

(3-8) Since the inclination angle of the exhaust surface 63B of the suction fan 63, the shape of the cylindrical body 612, and the shape of the air guide member 65 can be adjusted according to the heating state of the power supply unit 61 and the lamp driving unit 62, so that Cooling air can be introduced into each of the cylindrical body 612 and the air guide member 65 in proportion, so that their cooling efficiency can be further improved. In addition, since the cylindrical body 612 and the air guide member 65 are made of metal, they can have the function of electromagnetic shielding, so it is no longer necessary to take EMI countermeasures for the main body substrate 611 of the power supply unit 61 and the lamp driving unit 62, which can simplify the operation. Internal structure of projector 1.

(3-9) Since the suction fan 63 has already been installed on the cylindrical body 612 of the power supply unit 61, when the suction fan 63 is arranged obliquely with respect to the bottom surface 22A of the external cabinet 2, it is not necessary to install the suction fan 63 on the bottom surface. 22A is additionally provided with a supporting member for the suction fan 63, thereby further simplifying the internal structure of the projector 1 and realizing miniaturization.

(3-10) Since the air suction surface 63A of the suction fan 63 is arranged obliquely with respect to the bottom surface portion 22A where the air suction opening 30 is formed, the air sucked up from the vertical direction can flow in the horizontal direction, thereby making it possible to properly Since the exhaust direction can be selected accurately, the degree of freedom in selecting the flow path of the cooling air flow corresponding to the internal structure of the projector 1 can be increased.

(3-11) Although the cooling system A for cooling the optical unit 4 and the control board 5 and the cooling system B for cooling the power supply device are independent cooling channels, they can be exhausted from the common exhaust opening 35. The forming of the box is simplified, and it is easy to manage the discharge direction of the air.

(3-12) Since the internal louver 83 as the exhaust member of the cooling system A, the opening portion 612g as the exhaust member of the cooling system B1, and the opening portion 65b as the exhaust member of the cooling system B2 are placed within the area It is arranged to face the opening 35 formed in the front cabinet 23, so the cooling air of the cooling system A, cooling systems B1 and B2 can be discharged from different areas in the exhaust opening 35. Therefore, since the cooling air flows of the cooling system A, the cooling systems B1 and B2 can be discharged without interfering with each other even when they are discharged, the cooling air inside the projector 1 can flow smoothly, and the projector can be efficiently operated. 1 internal cooling.

(3-13) Since the suction surface 63A of the suction fan 63 is arranged obliquely so as to approach the suction opening 30 as it approaches the exhaust opening 35, the suction surface 63A of the suction fan 63 becomes a flat surface. In the direction opposite to the exhaust opening 35 , the air intake fan 63 can be prevented from re-inhaling the air exhausted from the exhaust opening 35 that has cooled other heat source parts inside the projector 1 and heated up. With this, the suction fan 63 can suck in more cold air outside the projector 1 .

(4) Modification of Embodiment

The present invention is not limited to the above-described embodiments, but also includes modifications as shown below.

In the above-mentioned embodiment, although the suction fan 63 of the cooling system B of the power supply unit 61 and the lamp driving unit 62 is arranged obliquely with respect to the bottom surface 22A of the exterior cabinet 2, the present invention is not limited thereto. That is, the present invention can also be employed when the air intake fan is arranged directly below the optical device 44 .

In addition, in the above-mentioned embodiment, although the cooling system B and the cooling system A are separated by the plate-shaped body 64, this invention is not limited to this. That is, the cooling system may be independent by connecting a pipe-shaped member to the opening 30 .

Furthermore, in the above-mentioned embodiment, although the present invention is applied to the optical unit 4 having a substantially L-shape in plan view, the present invention is not limited thereto, and the present invention may also be employed in a substantially U-shaped optical unit 4 in plan view. invention. In this case, since the power supply unit and the like can be arranged in the U-shaped central portion, the present invention which can improve the cooling efficiency of these units is more effective.

In addition, in the above-mentioned embodiment, although the two lens arrays 120 and 130 that divide the light from the light source 110 into a plurality of partial beams are used, the present invention can also be applied to a projector that does not use such a lens array. .

In addition, in the above-mentioned embodiment, although the modulation of the light beam emitted from the light source is performed by means of the liquid crystal panels 441R, 441G, and 441B, it is not limited to this, and the present invention can also be used in a light modulation device using a micromirror. invention. In the above embodiments, an example of a projector using three light modulation devices was described, but the present invention can also be applied to a projector using one, two, four or more light modulation devices.

In addition, in the above-mentioned embodiments, an example in which the present invention is applied to a transmissive projector has been described, but the present invention can also be applied to a reflective projector. Here, "transmissive" means that the light valve of a liquid crystal panel or the like transmits light, and "reflective" means that the light valve reflects light. In the case of reflective projectors, the light valve can be constructed with just a liquid crystal panel without a pair of polarizers. In addition, in the case of reflective projectors, the cross dichroic prism can be used as a color light separation device that separates illuminating light into red, green, and blue light, and at the same time, it can sometimes be used to recombine the modulated light. A color light synthesis device that emits three colors of light in the same direction. In addition, instead of using a cross dichroic prism, a dichroic prism combining a plurality of dichroic prisms in the shape of a triangular prism or a quadrangular prism may be used. When the present invention is applied to a reflective projector, substantially the same effect as that of a transmissive projector can be obtained. In addition, the light valve is not limited to the liquid crystal panel, for example, a light valve using a micromirror may be used.

As projectors, there are front projectors that project images from the direction in which the projection surface is viewed, and rear projectors that project images from the side opposite to the direction in which the projection surface is viewed. It can be applied to any configuration.

In addition, the specific structure, shape, etc. at the time of implementing the present invention can also be made into other structures within the range that can achieve the object of the present invention.

Claims (11)

1. projector, it possesses: light source, the light beam that penetrates from above-mentioned light source according to image information modulation form the optic modulating device of optical image and take in the casing of above-mentioned light source and above-mentioned optic modulating device, and enlarge the optical image that projection is formed by above-mentioned optic modulating device, it is characterized in that possessing:

The foot of the projected position of the optical image that being set to can be flexible from the outer peripheral face of above-mentioned casing, adjust extended projection;

The air-breathing peristome that on the face of the above-mentioned casing that above-mentioned foot is set, forms; With

Be arranged near the above-mentioned air-breathing peristome of above-mentioned box house, from the outside drawing fan that imports cooling air of above-mentioned casing,

Wherein, the suction face of above-mentioned drawing fan is with respect to the face tilt ground configuration of the above-mentioned casing that is formed with above-mentioned air-breathing peristome.

2. projector according to claim 1 is characterized in that:

Possess the light source driving circuit that is used for driving usefulness to the power circuit of above-mentioned light source and above-mentioned optic modulating device supply capability and above-mentioned light source,

Above-mentioned drawing fan is used to cool off in the cooling flowing path of above-mentioned power circuit and light source driving circuit.

3. projector according to claim 2 is characterized in that:

Be set with the cooling flowing path of the cooling air that imports by above-mentioned drawing fan independently with other cooling flowing path.

4. projector according to claim 3 is characterized in that:

Above-mentioned cooling flowing path is constituted as and makes above-mentioned cooling air logical along the surface current of the above-mentioned casing that is formed with above-mentioned air-breathing peristome.

5. according to claim 3 or 4 described projector, it is characterized in that:

Above-mentioned cooling flowing path is divided from the upright tabular body that is provided with of above-mentioned casing inner face.

6. according to any one the described projector in the claim 2～5, it is characterized in that:

Above-mentioned power circuit and above-mentioned light source driving circuit are surrounded by the wind guiding member of tubular respectively, are fed in each wind guiding member from the cooling air of above-mentioned drawing fan.

7. projector according to claim 6 is characterized in that:

Above-mentioned drawing fan is installed on the above-mentioned wind guiding member.

8. projector according to claim 1 is characterized in that:

Above-mentioned air-breathing peristome is the 1st air-breathing peristome,

Above-mentioned drawing fan is the 1st drawing fan,

On the side of above-mentioned casing, possess the air that makes above-mentioned box house to the outside exhaust port portion that discharges of above-mentioned casing,

Wherein, possess:

The 2nd air-breathing peristome of on above-mentioned casing, turning up the soil and being provided with the above-mentioned the 1st air-breathing opening portion;

Be arranged on above-mentioned the 2nd air-breathing peristome neighbouring, from outside the 2nd drawing fan that imports cooling air of above-mentioned casing;

By importing above-mentioned casing air outside from the above-mentioned the 2nd air-breathing peristome to above-mentioned box house by above-mentioned the 2nd drawing fan, make it to flow to above-mentioned exhaust port portion and to flow to the outside mode of discharging of above-mentioned casing, cool off the 1st cooling system of above-mentioned optic modulating device and above-mentioned light source from above-mentioned exhaust port portion; With

By importing above-mentioned casing air outside from the above-mentioned the 1st air-breathing peristome to above-mentioned box house by above-mentioned the 1st drawing fan, make it to flow to above-mentioned exhaust port portion and to flow to the outside mode of discharging of above-mentioned casing, cool off the 2nd cooling system of above-mentioned power circuit and above-mentioned light source driving circuit from above-mentioned exhaust port portion.

9. projector according to claim 8 is characterized in that:

Above-mentioned the 1st cooling air stream and above-mentioned the 2nd cooling air stream, in above-mentioned exhaust port portion from separately zone discharge.

10. it is characterized in that according to Claim 8 or 9 described projector:

Above-mentioned power circuit is configured in the 1st wind guiding member of tubular;

Above-mentioned light source driving circuit is configured in the 2nd wind guiding member of tubular;

The part of above-mentioned the 2nd cooling air stream is imported in above-mentioned the 1st wind guiding member, and another part of above-mentioned the 2nd cooling air stream is imported in above-mentioned the 2nd wind guiding member;

Airflow that comes from the circulation of above-mentioned the 1st wind guiding member and the airflow that comes from above-mentioned the 2nd wind guiding member circulation are discharged from zone separately in above-mentioned exhaust port portion.

11. the described projector of any one according to Claim 8～10 is characterized in that:

The suction face of above-mentioned the 1st drawing fan be configured to obliquely along with to above-mentioned exhaust port portion near and away from the above-mentioned the 1st air-breathing peristome.

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