CN1705909A - Lighting system, discharge unit, and projector including the same - Google Patents

Abstract

A projector (1), wherein a light source device (411), an exhaust duct (81) having a suction port (81A) facing the light source device (411) and an exhaust port (81B), and an axial fan (82) installed between the suction port (81A) and the light source device (411) are installed in an outer case (2), the exhaust port (81B) is so formed that an opening area is smaller than that of the suction port (81A), the center of the exhaust port (81B) is positioned eccentric to the center of the suction port (81A), and the blowing direction of the axial fan (82) is tilted relative to a direction in which cooling air (A) is discharged from the exhaust port (81B), whereby when the cooling air blown from the axial fan (82) to cool a light source lamp is discharged through the exhaust duct (81), a light shielding capability can be increased and the delivery pressure of the discharged cooling air can be increased.

Description

Lighting device, exhaust unit and possess the projector of this device and unit

Technical field

The present invention relates to possess light source, cool off this light source cooling system, possess the cooling system air entry of the air that is taken into this cooling system and discharge this cooling system air the cooling system exhausr port and take in the casing of light source and discharge the electronic equipment and the projector of exhaust unit that light source has been carried out the cooling air of cooling from above-mentioned cooling system exhausr port.

Background technology

People just know the projector that enlarges projection according to the image information modulation from the light beam of light source ejaculation in the past.In the last few years, such projector had been used to demonstrate in the personal computer of enterprise, in the various uses such as perhaps see a film within the family.

Such projector possesses optical system, light source, the power circuit to their supply capabilities, the lamp drive circuit that is used for forming optical image and takes in their casing.

Here, light source, power circuit and lamp drive circuit are the pyrotoxins that generates heat in action, contain the parts that To Be Protected from Heat and constitute in the optics, optic modulating device of optical system.For this reason, in projector, just be provided with from the outside cooling system that imports each parts of cooling air, cooling box house of casing.

This cooling system can be categorized as cooling system, light source cooling system, power supply and the lamp drive circuit cooling system of optical system, employing be following formation.

For example, open in the 2000-10191 communique (Fig. 1) illustrated just as open 2000-330202 communique (Fig. 7, Fig. 8) and spy the spy, the cooling system of optical system, near the exhausr port that is formed on the casing, extraction fan is set, discharges with this extraction fan optical system is carried out cooled air.The light source cooling system is being discharged with extraction fan after importing to the light source place optical system having been carried out cooled air.Power supply and lamp drive circuit cooling system, the cooled air of optical system is imported to power supply and lamp drive circuit and to these circuit carried out the cooling after, discharge with extraction fan.

Summary of the invention

Yet, in the light source cooling system,, be provided with the gas exhaust duct that light source and extraction fan are linked up in order to lead toward extraction fan light source having been carried out cooled air expeditiously.This gas exhaust duct is made the shape of quadrangular barrel substantially with constant substantially area of section, in air entry one side light source is covered, and then is connected on the extraction fan in exhausr port one side simultaneously.Therefore, the outside from casing under situation about having can see that light source is all or it is most of by gas exhaust duct, and light-proofness is low.

The object of the present invention is to provide and possess exhaust unit that can improve light-proofness and the projector that possesses this unit.

Electronic equipment of the present invention, it is in casing, to possess: light source, have towards the air entry of above-mentioned light source and discharge from what above-mentioned air entry sucked above-mentioned light source is carried out the gas exhaust duct of the exhausr port of cooled cooling air, and be installed in the above-mentioned air entry of above-mentioned gas exhaust duct and the electronic equipment of the extraction fan between the above-mentioned light source, it is characterized in that: little and center above-mentioned exhausr port is set to center off-centre with respect to above-mentioned air entry to above-mentioned exhausr port with respect to above-mentioned air entry aperture area, and the direction that the air supply direction of above-mentioned extraction fan is discharged from above-mentioned exhausr port with respect to cooling air tilts.

In addition, the present invention it is desirable to, and direction one side at the center of above-mentioned exhausr port with respect to the center off-centre of above-mentioned air entry possesses the eccentric side wall; Above-mentioned eccentric side wall is essentially surface level; The deflation area of above-mentioned extraction fan, be inclined to make along with from above-mentioned air entry before above-mentioned exhausr port and then away from above-mentioned eccentric side wall.

If employing the present invention, owing to form the aperture area of exhausr port forr a short time than the aperture area of air entry, so promptly see under the situation of light source from the outside of gas exhaust duct in discharge direction from cooling air, owing to can reduce the part that to see among the light source, so can improve light-proofness, can also improve the discharge pressure of the cooling air that will discharge.And, owing to be the center configuration of exhausr port center off-centre, so, also can avoid having the core of the light source of high briliancy even if exist the light leakage of carrying out to the outside from air entry.

Here, owing to form the aperture area of exhausr port forr a short time than the aperture area of air entry, so extraction fan is being installed under the situation of exhausr port one side, owing to making the extraction fan miniaturization make exhaust performance to reduce, but, under situation of the present invention, because extraction fan is configured in air entry one side, so can guarantee sufficient exhaust performance.

In addition, make the part of among the wall of a gas exhaust duct side opposite, tilt with respect to the discharge direction of cooling air with the eccentric side of exhausr port.Therefore under the consistent substantially situation of the air supply direction that makes extraction fan and the discharge direction of cooling air, in gas exhaust duct, the cooling air that passes through at the eccentric side of exhausr port will advance towards exhausr port as the crow flies along the duct wall face, but to run into pipeline wall at a slant at the cooling air that a side opposite with eccentric side passed through, make current intelligence worsen.

If employing the present invention, air supply direction by making extraction fan tilts aptly with respect to the discharge direction of cooling air, because the balance between the air-flow that can be formed on the cooling air that the eccentric side of exhausr port passes through well and the air-flow of the cooling air that passes through in its opposite side is so can improve exhaust efficiency.

In addition, since make the deflation area of extraction fan tilt for respect to as the eccentric side wall of the generally horizontal plane of exhausr port along with from air entry before exhausr port so that away from, so the balance of the airflow of gas exhaust duct inside will become better, can further improve exhaust efficiency.

In the present invention, it is desirable to the eccentric side wall of direction one side of center off-centre that above-mentioned gas exhaust duct possesses the above-mentioned relatively air entry in center of above-mentioned exhausr port; Above-mentioned eccentric side wall bloats to direction one side of the center off-centre of the above-mentioned relatively air entry in the center of above-mentioned exhausr port; The deflation area of above-mentioned extraction fan, be inclined to make along with from above-mentioned air entry before above-mentioned exhausr port and then away from above-mentioned eccentric side wall.

If employing the present invention, because the eccentric side wall of gas exhaust duct bloats to eccentric direction one side, thereby reduced from be inclined to along with from air entry before exhausr port and then away from the direction of the airflow of the deflation area air-supply of the extraction fan of eccentric side wall and the angle between the eccentric side wall, and can change the air flow direction exhausr port lentamente, so can reduce frictional resistance, can discharge cooling air sleekly by the eccentric side wall generation of gas exhaust duct.

In the present invention, it is desirable to above-mentioned gas exhaust duct, possess anti-eccentric side wall in a side opposite with the direction of the center off-centre of the relative above-mentioned air entry in center of above-mentioned exhausr port; Above-mentioned anti-eccentric side wall possess be inclined to along with from above-mentioned air entry before above-mentioned exhausr port and then upwards state the close sloping portion of eccentric side wall; Above-mentioned sloping portion is positioned at the above-mentioned pipeline suction side among the above-mentioned anti-eccentric side wall.

If employing the present invention, owing to can possess from the sloping portion of air entry in air entry one side towards the exhausr port inclination, can be deflated the airflow that fan imports in the gas exhaust duct and flow by making along this sloping portion, and with the airflow rectification for to advance, so can improve cooling effectiveness towards exhausr port.

In addition, since the deflation area of extraction fan of the present invention be inclined to along with from air entry before exhausr port and then away from the eccentric side wall, so under the situation about vertically disposing with respect to the eccentric side wall of gas exhaust duct with the deflation area of extraction fan relatively, owing to make and to blow with bigger angle from the air-supply of extraction fan perpendicular line with respect to the sloping portion of gas exhaust duct, so can carry out rectification to the airflow that is imported into by multiplying each other (amplification) effect, can improve cooling effectiveness further from extraction fan.

In the present invention, it is desirable to above-mentioned anti-eccentric side wall possesses and the substantially parallel wall of above-mentioned eccentric side wall in above-mentioned exhaust side.

If employing the present invention, because gas exhaust duct becomes near exhausr port and is the parallel substantially each other cylindrical shape of wall, and make and to be rectified near the airflow the exhausr port substantially on the same direction, so can easily set discharge direction from the air of gas exhaust duct.

In the present invention, the aperture area that it is desirable to above-mentioned exhausr port be set to above-mentioned air entry aperture area basically half.

If employing the present invention then can also improve the shading efficient of exhausr port substantially when guaranteeing to discharge the size of the needed sufficient exhausr port of cooling air.

In the present invention, it is desirable to possess the window shutter with a plurality of vane plates, above-mentioned window shutter is installed on the above-mentioned exhausr port.

If employing the present invention by window shutter is installed, so can further carry out shading to the leak light from light source by vane plate, can also easily control discharge directions from gas exhaust duct by window shutter simultaneously on exhausr port.

In the present invention, all be to possess the projector that the light beam that penetrates from above-mentioned light source according to the image information modulation formed and enlarged the projection optics picture no matter it is characterized in that above-mentioned which electronic equipment.

If employing the present invention then can obtain effect, the effect same with the said electronic equipment in top, can realize improving light-proofness, also can improve the projector of the discharge pressure of cooling air.

Description of drawings

Fig. 1 shows the perspective schematic view that the outward appearance of the projector of example of the present invention constitutes;

Fig. 2 shows the perspective schematic view that the outward appearance of the projector of above-mentioned example constitutes;

Fig. 3 shows the perspective schematic view that the inside of the projector of above-mentioned example constitutes;

Fig. 4 shows the perspective schematic view that the inside of the projector of above-mentioned example constitutes;

Fig. 5 shows the mode chart of structure of optical system of the projector of above-mentioned example;

Fig. 6 shows the perspective schematic view of the configuration of the exhaust unit of above-mentioned example and supply unit;

Fig. 7 shows the perspective schematic view of configuration of the supply unit of above-mentioned example;

Fig. 8 shows the sectional view of arrangement of the supply unit of above-mentioned example;

Fig. 9 shows the perspective schematic view of cooling system of the projector of above-mentioned example;

Figure 10 shows the skeleton view of structure of the exhaust unit of above-mentioned example;

Figure 11 shows the sectional side view of structure of the exhaust unit of above-mentioned example;

Figure 12 shows the front elevation of structure of the exhaust unit of above-mentioned example.

Embodiment

Below, with reference to the accompanying drawings an example of the present invention is described.

(1) outward appearance constitutes

Fig. 1 and Fig. 2 show the projector 1 of example of the present invention, and Fig. 1 is the skeleton view of seeing from front, top one side, and Fig. 2 is the skeleton view of seeing from the back side, below one side.

This projector 1, be that the light beam that penetrates from light source according to image information modulation and enlarging projects to the optical device on the projecting plane of screen etc., possess a device body that comprises optical system described later is accommodated in inner outer installation shell 2 and the projecting lens 3 that exposes from outer installation shell 2.

Projecting lens 3, possess described later, as enlarging light beam that projection penetrated from light source according to the image information modulation by optic modulating device and, can be used as the compound lens formation that a plurality of lens is accommodated in lens barrel inside by the function of the projection optical system of the formed optical image of light beam after the synthetic modulation of light compositing device.

Outer installation shell 2 as casing, form the size wide rectangular shape bigger of the Width vertical, possess the front casing 23 that the previous section of lower casing 22 that the bottom of upper housing 21 that the handle assembly upper part of body covers, handle assembly body covers and handle assembly body covers with projecting direction than projecting direction size.These each casings 21～23rd are by the plastic integrally formed product of shapings such as injection molding forming.

Upper housing 21 possesses: the last facial 21A that the handle assembly upper part of body covers, the 21D of back side portion that hang down the side surface part 21B, the 21C that come substantially and hang down substantially and from the rearward end of last facial 21A in the Width end of facial 21A on this.

On the projecting direction front side of the 21A of portion, be provided with the starting that is used for carrying out projector 1, the guidance panel 24 of adjusting operation in the above.This guidance panel 24 possesses a plurality of switches of the adjustment switch that comprises starting switch, image, sound etc., when the projection of projector 1, by adjustment switch in the guidance panel 24 etc. is operated, just can carry out the adjustment of image quality, volume etc.

In addition, the vicinity of the guidance panel 24 of the 21A of portion is formed with a plurality of holes 241 in the above, and the loudspeaker (not shown) that voice output is used is taken in by portion within it.

These guidance panel 24 and loudspeakers are electrically connected with the control basal plate of constituent apparatus body described later.Handle by this control basal plate from the operation signal that guidance panel 24 obtains.

Overleaf on the 21D of portion,, in this recess, will expose being connected to the connector group 25 that is provided with on the interface board of control basal plate described later being formed with the recess of the 21A of portion one side otch in the above on the middle body substantially.

Lower casing 22, with and upper housing 21 between the composition surface be that the center constitutes substantially symmetry, possess bottom surface sections 22A, side surface part 22B, 22C and the 22D of back side portion.In addition, side surface part 22B, 22C and the 22D of back side portion, the part place engages with side surface part 21B, the 21C of upper housing 21 and the end portion of the 21D of back side portion in the top, constitutes the lateral parts and the back portion of outer installation shell 2.

On bottom surface sections 22A, be provided with fixed foot portion 26 in the rear end of projector 1 side cardinal principle centre, front end one side Width two ends are provided with and adjust foot 27 simultaneously.

This adjustment foot 27 is by constituting to the shaft like parts that face foreign side upwards flexible (advance and retreat) freely highlights from bottom surface sections 22A, and shaft like parts self is incorporated in the inside of outer installation shell 2.Can adjust the stroke of such adjustment foot 27 by the adjustment button 271 of operation setting on the lateral parts of projector 1 from bottom surface sections 22A.

So, just can adjust from the upper-lower position of the projected image of projector's 1 ejaculation, the formation projected image can be in the proper place.

In addition, on bottom surface sections 22A, also be formed with peristome 28,29 and 30 with the internal communication of outer installation shell 2.

Peristome 28 is the parts of loading and unloading the light supply apparatus 411 of the light source that comprises projector 1, gets up with lampshade 281 obturations usually.

Peristome 29,30 is constituted as the peristome of slit-shaped.

Peristome 29 is to be used for cooling off the air-breathing peristome that comprises as be taken into usefulness from the cooling air of the optical devices 44 of the liquid crystal panel of the optic modulating device of the light beam of illuminator ejaculation according to the image information modulation.

Peristome 30 is to be used for being taken into (suction) air-breathing peristome in order to the cooling air of the supply unit of the device body of cooling constituting projector 1.

In addition and since the slit-shaped openings of peristome 29,30 part always with the internal communication of projector 1, so side is respectively arranged with membrane filter and enters into inside not make dust etc. within it.

In addition, on bottom surface sections 22A, also be provided with respect to bottom surface sections 22A and can be installed in cover 31 on the outside with being free to slide, and constitute and to be accommodated in the inside of this cover 31 being used for the telepilot of remote-controlled operation projector 1.In addition, in unshowned telepilot, be provided with said guidance panel 24 on top on be provided with starting switch, adjust same switch such as switch, when remote controller, will be from the telepilot output infrared signal corresponding with this operation, infrared signal can be handled by the light accepting part 311 usefulness control basal plate that are arranged on the outer installation shell front and the back side.

Overleaf on the 22D of portion, with same under the situation of upper housing 21, on the substantial middle part, form bottom surface sections 22A one side by the recess of otch, the connector group 25 that is arranged on the above-mentioned interface board is exposed, simultaneously, also be formed with peristome 32 near the end, input connector 33 exposes from this peristome 32.Input connector 33 is from the terminal of external power source to projector's 1 supply capability, is electrically connected with power supply unit described later.

Constituting of front casing 23 possesses front face 23A, goes up facial 23B and lower face 23C, projecting direction rear end one side of the 23B of portion engages with the projecting direction fore-end of the said upper housing 21 in top in the above, and projecting direction rear end one side of the 23C of portion engages with the projecting direction fore-end of the said lower casing 22 in top below.

In front on the 23A of portion, be formed with and be used for making round-shaped substantially peristome 34 that projecting lens 3 exposes and at its contiguous peristome 35 that constitutes by a plurality of slits that forms.

Peristome 34 side in the above also is formed opening, and the part of the lens barrel of projecting lens 3 is exposed, and makes to be arranged on knob (handle) 3A, the 3B that usefulness is adjusted in lens barrel zoom-focusing on every side from peripheral operation.

Peristome 35, constitute the exhaust port portion of discharge to the cooled air of device body, from the projecting direction of this peristome 35, discharge the cooled air of optical system, control system and supply unit to the component parts as projector 1 described later to projector 1.That is, peristome 35 is the exhaust port portions that are used to discharge in order to the cooling air of the cooling system of the component parts of cooling projector 1.

(2) inner formation

As Fig. 3～shown in Figure 5, the device body of projector 1 is accommodated in the inside of so outer installation shell 2, and constituting of this device body possesses optical unit shown in Figure 34, control basal plate 5 and supply unit 6 shown in Figure 4.

(2-1) structure of optical unit 4

Optical unit 4 as optical system, be to form optical image from the light beam that light supply apparatus 411 penetrates according to image information adjustment system, form the unit of projected image by projecting lens 3 on screen, it constitutes light supply apparatus 411 or various opticses etc. is assembled in the such used for optical part casing of optical waveguide shown in Figure 4 40.

This optical waveguide 40, by following optical waveguide 401 and in Fig. 4, omitted illustrated on optical waveguide constitute, each all is the synthetical resin products that forms by injection molding forming etc.

Following optical waveguide 401 is formed the top that is made of bottom surface sections 401A that takes in optics and side wall portion 401B and forms the container-like of opening, and side wall portion 401B is provided with a plurality of ditch 401C of portion.The various opticses that constitute optical unit 4 are assembled in the 401C of this ditch portion, so, just can precision well each optics be configured on the lighting optical axis that is arranged in the optical waveguide 40.Last optical waveguide has the flat shape corresponding with this time optical waveguide 401, constitutes the lid shape parts that the upper cover of optical waveguide 401 is down got up.

In addition, the light beam emitting side end of the bottom surface sections 401A of following optical waveguide 401A is provided with the front side wall that has formed round-shaped peristome, fixedly installs the cardinal extremity part of projecting lens 3 on this front side wall.

In such optical waveguide 40, as shown in Figure 5, can be integration lamp optical system 41, color separation optical system 42, relay optical system 43 from rough segmentation on the function, make optical modulation optics system and look combining optical integrated optical devices 44.In addition, this routine optical unit 4 is to adopt in 3 board-like projectors, constitutes in optical waveguide 40 optical unit of space look divergence type that the beam separation that penetrates from integration lamp optical system 41 is become the coloured light of 3 looks.

Integration lamp optical system 41, be to make the light beam that penetrates from light source become optical system for the light beam of the illumination homogeneous in the lighting optical axis vertical plane, it constitutes possesses light supply apparatus the 411, the 1st lens arra the 412, the 2nd lens arra 413, polarization conversion device 414 and overlapping lens 415.

Light supply apparatus 411 possesses illuminator 416 and reverberator 417 as the radiation light source, becomes from the radial light of illuminator 416 ejaculations with reverberator 417 reflection to be parallel rays substantially, penetrates to the outside.In this example, though what adopt as illuminator 416 is high-pressure mercury-vapor lamp, in addition also can adopt metal halide lamp or Halogen lamp LED.In addition, in this example,, also can adopt the parallelization concavees lens are configured in constituting on the outgoing plane of the reverberator that is made of off-axis paraboloids and ellipsoids mirrors though what use as reverberator 417 is paraboloidal mirror.

The 1st lens arra 412 possesses and has the formation that the lenslet of the profile of rectangular shape is substantially lined up seeing from the lighting optical axis direction rectangularly.Each lenslet is divided into segment beam to the light beam that penetrates from illuminator 416, penetrates to the lighting optical axis direction.The contour shape of each lenslet is set the shape broadly similar with the image forming area of liquid crystal panel 441 described later for.For example, if the horizontal vertical of the image forming area of liquid crystal panel 441 is 4: 3 than (ratio of horizontal with vertical size), then the horizontal vertical ratio of each lenslet also will be set at 4: 3.

The formation of the 2nd lens arra 413 is identical substantially with the 1st lens arra 412, possesses the formation that lenslet is lined up rectangularly.The 2nd lens arra 413 with overlapping lens 415, has the function of picture imaging on liquid crystal panel 441 of each lenslet that makes the 1st lens arra 412.

Polarization conversion device 414 is transformed into a kind of polarized light to the light from the 2nd lens arra 413, so, has improved the utilization factor of the light in optical devices 44.

Specifically, be transformed into a kind of various piece light beam behind the polarized light, finally overlapped onto substantially by overlapping lens 415 on the liquid crystal panel 441 of optical devices 44 by polarization conversion device 414.In the projector of the liquid crystal panel 441 of the type of using modulated polarized light owing to can only utilize a kind of polarized light, so from the light beam of the illuminator 416 that sends polarized light at random roughly half just can not utilize.For this reason,, the light beam that penetrates from illuminator 416 all is transformed into a kind of polarized light, has improved the utilization ratio of the light in the optical devices 414 by using polarization conversion device 414.In addition, such polarization conversion device 414 is for example opened in the flat 8-304739 communique the spy and is introduced.

Color separation optical system 42 possesses 2 dichronic mirrors 421,422 and catoptron 423, has the function that a plurality of segment beams that penetrate from integration lamp optical system 41 is separated into the coloured light of red (R), green (G), blue (B) this 3 look by dichronic mirror 421,422.

Relay optical system 43 possesses light incident side lens 431, relay lens 433, catoptron 432,434, has the function that the red light as the coloured light that is separated by color separation optical system 42 is directed to liquid crystal panel 441R.

At this moment, in the dichronic mirror 421 of color separation optical system 42, among the light beam of integration lamp optical system 41 ejaculations, see through red light composition and green light composition, the reflection blue light component.Blue light by after dichronic mirror 421 reflections in the reflection of catoptron 423 places, behind field lens 418, arrives the liquid crystal panel 441B of blue usefulness.This field lens 418 becomes the parallel light beam of its central shaft (chief ray) relatively to the various piece optical beam transformation that penetrates from the 2nd lens arra 413.The field lens 418 that is arranged on the light incident side of other liquid crystal panel 441G, 441R also is same.

In addition, among the red light and green light after having seen through dichronic mirror 421, green light is reflected by dichronic mirror 422, passed through field lens 418 after, arrive the liquid crystal panel 441G of green usefulness.On the other hand, red light by behind the field lens 418, arrives the liquid crystal panel 441R that red light is used again seeing through dichronic mirror 422 backs by relay optical system 43.

In addition, why will use relay optical system 43 to red light, be because the length of the light path of red light is longer than the optical path length of other coloured light, prevent the cause of the utilization ratio reduction of the light that caused by dispersing of light etc.That is be, because the segment beam that incides on the light incident side lens 431 is maintained the original state cause that ground field lens 418 propagates.In addition,, relay optical system 43 makes the formation that red light is passed through among 3 coloured light though becoming,, be not limited to this, for example, also can become the formation that blue light is passed through.

Optical devices 44 are modulated into the light beam that shines according to image information and are formed coloured image, possess: 3 light incident side polaroids 442 of each the coloured light institute incident that separates by color separation optical system 42, be configured in liquid crystal panel 441R, 441G, the 441B as optic modulating device of the back level of each light incident side polaroid 442, with the emitting side polaroid 443 of the back level that is configured in each liquid crystal panel 441R, 441G, 441B, and as the cross colour splitting prism 444 of look combining optical.

Liquid crystal panel 441R, 441G, 441B for example are used as on-off element to multi-crystal TFT, omitted though illustrate, and, it constitutes the panel body that will be sealing into sealing liquid crystal in a pair of transparency carrier that disposes in opposite directions and is accommodated in the maintenance frame.

In optical devices 44,,, modulate the formation optical image according to image information by means of these 3 liquid crystal panel 441R, 441G, 441B, light incident side polaroid 442 and emitting side polaroid 443 by each coloured light that color separation optical system 42 separates.

Among each coloured light that is separated by color separation optical system 42, light incident side polaroid 442 only makes the polarized light of constant direction see through, and absorbs other light beam, forms by the substrate top that polarizing coating is pasted sapphire glass etc.In addition, also can paste polarizing coating on the field lens 418 and do not use substrate.

Emitting side polaroid 443 also similarly constitutes substantially with light incident side polaroid 442, among the light beam that penetrates from liquid crystal panel 441 (441R, 441G, 441B), the polarized light of prescribed direction is seen through, and absorb other light beam.In addition, also can paste polarizing coating on the cross colour splitting prism 444 and do not use substrate.

These light incident side polaroids 442 are set so that with emitting side polaroid 443 direction of polarization axle each other is vertical.

Cross colour splitting prism 444 is to penetrating from emitting side polaroid 443 and each coloured light all having been carried out the optical image after the modulation and synthesized and form coloured image.

In cross colour splitting prism 444, the dielectric multilayer film of reflection red light and the dielectric multilayer film of reflect blue light become X-shaped shape substantially along the layout setting of 4 right-angle prisms, by means of the synthetic 3 kinds of coloured light of these dielectric multilayer films.

Such optical devices 44, the panel fixed head that has the pin (contact pin) that direction is outstanding outside face by handle in 4 bights of rectangular plate shape body pastes on each light beam incident end face of cross colour splitting prism 444, and each pin of insertion just can be integrated in the hole that forms in the maintenance frame of liquid crystal panel 441R, 441G, 441B.

Then, the optical devices after integrated 44 are configured on the light path prime of projecting lens 3 of the said optical waveguide 40 in top, and screw (screw element) is fixed to down on the bottom surface sections of optical waveguide 401.

(2-2) structure of control basal plate 5

Control basal plate 5, as shown in Figure 3, be configured to the upside of optical unit 4 is covered, possess: arithmetic processing apparatus, liquid crystal panel are installed drive with the main substrate 51 of IC with in the rear end side of this main substrate 51 and couple together and the 21D of back side portion of the shell 2 of installing outside, the interface board 52 that stands up in the 22D place.

In the back side of interface board 52 side said connector group 25 in top is installed,, exports to main substrate 51 by this interface board 52 from the image information of connector group 25 inputs.

Arithmetic processing apparatus on the main substrate 51 after the image information of being imported is carried out calculation process, is exported steering order to the liquid crystal panel driving with IC.Drive and use IC, produce output drive signal to drive liquid crystal panel 441, so, just can carry out optical modulation and form optical image according to image information according to this steering order.

Such main substrate 51 is covered by the sheet metal 53 that punch metal is carried out bending machining formation, and this sheet metal 53 is to be provided with by the EMI (electromagnetic interference (EMI)) of generations such as the circuit component on the main substrate 51 in order to prevent.

(2-3) structure of supply unit 6

Supply unit 6 possesses: have the power supply unit 61 of power circuit shown in Figure 6 and have the lamp driver element 62 of the light source driving circuit shown in Figure 7 of the below that will be configured in this power supply unit 61.

Power supply unit 61, the electric power of supplying with from the outside by the unshowned feed cable that is connected on the said input connector 33 in top to supplies such as above-mentioned lamp driver element 62 or control basal plate 5.

This power supply unit 61, as shown in Figure 8, it constitutes the metal cylindrical body 612 that possesses this structure base board 611, this this structure base board 611 is fenced up.In addition, why cylindrical body 611 being become metallic article, is because remove outside the function as the wind guide component of the cooling air that flows, equally also will prevent the cause of EMI with the sheet metal 53 of control basal plate 5.

One distolateral lateral parts of cylindrical body 612 extends downwards, and drawing fan 63 is installed between this extension.

This drawing fan 63, be installed as with being tilted along with from one distolateral towards another distolateral advancing and close with respect to the end face 612e of this structure base board 611 and cylindrical body 612, the part of the deflation area 63B of drawing fan 63 faces the inside of cylindrical body 612.

Lamp driver element 62 is to be used for the translation circuit of stable voltage to said light supply apparatus 411 supply capabilities in top, industrial alternating current from power supply unit 61 inputs, after being carried out rectification, conversion by this lamp driver element 62, becoming is by for toward light supply apparatus 411 behind DC current or the AC square wave current.

This lamp driver element 62, as shown in Figure 8, its constitute possess substrate 621, the various circuit components 622 on the upper part of substrate 621, wind guide component 65 that cooling air is flowed to substrate 621 and circuit component 622.In addition, lamp driver element 62 also is configured to a part and intersects with the said power supply unit 61 in top.

Such power supply unit 61 and lamp driver element 62 as shown in Figure 8, are fixed on the lower casing 22.

At first, lamp driver element 62 is being fixed on the bottom surface sections 22A of lower casing 22 by resin rivet 62a under the state that is fenced up by wind guide component 65.In addition, lamp driver element 62 also can become by screw rather than rivet 62a and is fixed to formation on the bottom surface sections 22A.

Secondly, power supply unit 61 is configured to see that the part with this lamp driver element 62 intersects on plan view on the top of lamp driver element 62, omitted though in Fig. 8, illustrate, but make the screw aligned position that forms on the screw that forms on the top of tabular body 64 and the cylindrical body 612, be fixed to by screw 64b on the upper part of tabular body 64 at power supply unit 61.

At this moment, be arranged on the drawing fan 63 on the cylindrical body 612, be configured under the state that is fenced up by a plurality of tabular bodys 64, leave a distance a little with the peristome 30 that on bottom surface sections 22A, forms, then, again the suction face 63A of drawing fan 63 is configured to along with before the projecting direction of projector 1 and then near bottom surface sections 22A obliquely with respect to bottom surface sections 22A.

In this example, in cooling system A described later, owing to be to discharge cooled air in the front of projector 1 side, and become such tilted configuration, but, when will be under the situation of the back side of projector 1 a side exhaust, it is desirable to this inclination is become in the opposite direction.In a word, drawing fan 63 it is desirable to be configured so that obliquely suction face 63A along with near the discharge directions of the cooling air stream of projector 1 in other words along with near peristome 35 and near air-breathing peristome 33.

So, suck because of other thermal source portion being cooled off the possibility of the air of projector 1 inside of heating up,, can further improve cooling effectiveness so drawing fan 63 can the low air of inlet temperature owing to can reduce drawing fan 63.

(2-4) cooling construction

In the on top said projector 1, as shown in Figure 9, be provided with the cooling system A of cooling optical devices 44 and the cooling system B of cooling supply unit 6.

Cooling system A is by means of the air-flow of suction unit 7 from the air-breathing cooling air of peristome 29 (referring to Fig. 2).

The constituting of suction unit 7 comprises that clipping a pair of Sirocco fan 71 that projecting lens 3 disposes in opposite directions and the suction face that makes this a pair of Sirocco fan 71 is communicated to pipeline (not shown) on the peristome 29.

By means of the suction unit 7 direct cooling airs that suck from the outside of projector 1, by Sirocco fan 71, by below for past liquid crystal panel 441R, 441G, 441B, light beam incident end face along cross colour splitting prism 444 flows liquid coolant crystal panel 441R, 441G, 441B, emitting side polaroid 443 and light incident side polaroid 442 upward from the below.

To the cooling air of the top of optical devices 44 stream, touch main substrate 51 its airflow directions of back that constitute control basal plate 5 and change with the right angle bending, the various circuit components that are assemblied on the main substrate 51 are cooled off.

The cooling air of cooling behind the main substrate 51 is deflated fan 81 and collects and be sent to gas exhaust duct 82, discharges to the outside of projector 1 from the peristome 35 (referring to Fig. 1) of front casing 23.

Here, front from the projector 1 of Fig. 9, be configured in the Sirocco fan 71 in projecting lens 3 left sides, though supply with cooling air to liquid crystal panel 441R, 441B, a part wherein but is used as the cooling air of polarization conversion device 414 and light supply apparatus 411.

In other words, the part of this cooling air flows in the gap that forms between below the bottom surface sections 22A of lower casing 22 and following optical waveguide 401, also wants branch to become 2 directions in its way.Cooling air behind one side's the branch, the slit pore that below the following optical waveguide 401 of the position corresponding, forms with polarization conversion device 414, after polarization conversion device 414 being cooled off, supplied to cool off toward 411 pairs of illuminators 416 of light supply apparatus toward optical waveguide 40 inside.Cooling air behind the opposing party's the branch is directly supplied toward light supply apparatus 411, cools light source lamp 416.

Then, cooled off the air behind the light supply apparatus 411, be deflated fan 81 and collect and be sent to gas exhaust duct 82 and discharge to the outside of projector 1 from the peristome 35 (referring to Fig. 1) of front casing 23.

As for the structure of the exhaust unit 8 that possesses extraction fan 81 and gas exhaust duct 82, will tell about in detail in addition in the back.

Cooling system B is the air-flow of the cooling air that sucks from peristome 30 (referring to Fig. 2) by means of the drawing fan 63 that is arranged on the power supply unit 61, comprises the cooling system B1 that cools off power supply unit 61 and the cooling system B2 of cool down lamp driver element 62.

Describe in more detail referring to Fig. 8.At first, cooling system B1, be by means of the part of drawing fan 63 outside cooling air that directly sucks of 1 from peristome 30 from projector for inside toward the cylindrical body 612 of power supply unit 61, after having cooled off the circuit component that is assemblied on this structure base board 611, direct airflow of discharging to the outside from the peristome 35 (referring to Fig. 1) that forms at lower casing 23.

On the other hand, cooling system B2, other part by means of drawing fan 63 outside cooling air that directly sucks of 1 from peristome 30 from projector is flowed to the below of cylindrical body 612 along tabular body 64, supply toward the inside that is arranged on the wind guide component 65 on the lamp driver element 62, behind the circuit component that has cooled off on the substrate 621 that is assemblied in lamp driver element 62, discharge to the outside from the part of the bottom of the gas exhaust duct 82 of peristome 35.

As mentioned above, cooling system A and cooling system B directly suck outer gas and after pyrotoxin is cooled off at the drawing fan 71,63 that is arranged by means of separately branch, lower casing 23 these sides from projector 1, eject from the air that cools off the gas exhaust duct 82 of the A of system from the upper left of peristome 35, eject from the air that cools off the ventilation component 65 of the B2 of system from the bottom left section of peristome 35, the air from the cylindrical body 612 of cooling system B1 is carried out exhaust from the lower right-most portion of peristome 35.Therefore, though cooling system A and B discharge cooled air from peristome 35, but to discharge from the different zone of peristome 35 respectively.

(2-5) structure of exhaust unit

Exhaust unit 8 as shown in Figure 9, is configured on the lateral parts of light supply apparatus 411 along outer installation shell 2.

This exhaust unit 8 possesses: the gas exhaust duct 81 of tubular, as the aerofoil fan 82 that is installed in the extraction fan on light supply apparatus 411 these side ends of this gas exhaust duct 81 be installed in inside window shutter 83 on front casing 23 these sides of gas exhaust duct 81.Exhaust unit 8 by means of the air-supply of aerofoil fan 82, by gas exhaust duct 81, is discharged by inner window shutter 83 near projector 1 inside of light supply apparatus 411 and control basal plate 5 being carried out cooled air.

Gas exhaust duct 81 shown in Figure 10～12, is the cross section pipeline of rectangular shape substantially, and its openings at two ends is as air entry 81A and exhausr port 81B.

As Figure 11 and shown in Figure 12, discharge direction (flow direction of cooling system A) from cooling air, the aperture area of the exhausr port 81B of gas exhaust duct 81 be made air entry 81A roughly half, and the center of exhausr port 81B is with respect to the center off-centre of air entry 81A.If describe with Figure 11, then the center of exhausr port 81B is set to off-centring with respect to air entry 81A prejudicially to the paper upside.That is to say that as shown in figure 12, when when exhausr port 81B one side is seen exhaust unit 8, exhausr port 81B is and the top of air entry 81A half position overlapped and size substantially.

Gas exhaust duct 81 possesses eccentric side wall 811 above becoming at the center of exhausr port 81B with respect to a side (upside among Figure 11) of the center off-centre of air entry 81A.Eccentric side wall 811 bloats to the lateral direction (direction up among Figure 11) of gas exhaust duct 81.In addition, gas exhaust duct 81 possesses anti-eccentric side wall 812 below becoming in a side (downside among Figure 11) opposite with respect to a side of the center off-centre of air entry 81A with the center of exhausr port 81B.Anti-eccentric side wall 812 falls in to the inboard of gas exhaust duct 81 (upside among Figure 11), it constitutes and comprises: from air entry 81A towards middle body be inclined to along with from air entry 81A towards exhausr port 81B advance near sloping portion 81C below the eccentric side wall 811 and from middle body till exhausr port 81B below horizontal component 81D.Therefore, gas exhaust duct 81 is to have shape towards the terminal broadening of end in air entry 81A one side, then is the pipeline that each several part has the shape of identical substantially internal diameter in exhausr port 81B one side.In addition, eccentric side wall 811 also can be that the plane is a surface level and do not bloat, in this case, below horizontal component 81D just will become the parallel substantially face of relative eccentric side wall 811.

Near the exhausr port 81B of gas exhaust duct 81, be provided with inner window shutter 83.

Inner window shutter 83, be that the cooling air of discharging from exhausr port 81B is carried out rectification, has the rectification window shutter that only makes the rectification function that cooling air flows to prescribed direction, it constitutes and is configured to parallel substantially each other towards upper and lower to a plurality of vane plates 831 of extension.

These vane plates 831 are arranged in the horizontal direction side by side along the stream of cooling air, on above-below direction exhausr port 81B are separated simultaneously.Each vane plate 831 from the flow direction of flow air in gas exhaust duct 81 (cooling system A), tiltedly descends direction with respect to exhausr port 81B towards a left side, the cooling air of discharging from exhausr port 81B just becomes the direction that the flow direction is left from the view field of image.

In addition, gas exhaust duct 81 is to use the synthetic resin that forms by injection moulding method to make, but by being cut apart along the length direction of cartridge and a pair of conduit component 84,85 of combination with one another constitutes.This a pair of conduit component 84,85, be constitute gas exhaust duct 81 lower portion, upside is formed with the following conduit component 84 of U-shaped substantially of opening and cross section upside, that downside is formed with opening that is configured in this time conduit component 84 last conduit component 85 of U-shaped substantially.

As Figure 10 and shown in Figure 12, following conduit component 84 has and is used for exhaust unit 8 is fixed to fixed part 841A～841C on the base plate of outer installation shell 2.Fixed part 841A is formed in down near the central of discharge directions of conduit component 84 and extends downwards from following, and extend in the horizontal direction its lower end, forms porose 842A on this extension.Fixed part 841B is formed from the following two sides of the air entry 81A side part of conduit component 84 and extends out, and forms porose 842B.Fixed part 841C is set to form porose 842C from till down the air entry 81A side end of conduit component 84 extends to the suction side of aerofoil fan 82 always on its top.

In addition, extend in the horizontal direction in 4 of ora terminalis bights on the side of following conduit component 84, is formed with pin 843 up on these extensions respectively.

On the other hand, on ora terminalis under the side of last conduit component 85, on the position corresponding, be formed with the extension that forms hole 851 with the pin 843 of following conduit component 84

Such gas exhaust duct 81, can be by following 4 pins 843 of conduit component 84 be connected 4 holes 851 of going up conduit component 85, conduit component 84 under these and last conduit component 85 are combined, form with the top of unshowned trowel fusions such as (flatirons) fixed pin 843.

Aerofoil fan 82 possesses suction face 821 and deflation area 822, sucks cooled air in the projector 1 that comprises illuminator 416 from this suction face 821, and the cooling air of this suction is sent in the gas exhaust duct 81 from deflation area 822.

By with aerofoil fan 82 screw retention to the air entry 81A of gas exhaust duct 81, make its air supply direction with respect to the flow direction of cooling system A tilted configuration up, exhaust portion 822 is clung on the air entry 81A, make cooling air can not let out from its coupling part.Tilted configuration to aerofoil fan 82 at length describes.The deflation area 822 of aerofoil fan 82, be inclined to along with from air entry 81A before exhausr port 81B and then away from eccentric side wall 811.Promptly, be configured to the deflation area 822 of aerofoil fan 82 vertical substantially with eccentric side wall 811 so that its with the consistent substantially corresponding situation of cooling system A flow direction A (referring to Figure 11) under, in gas exhaust duct 81, cooling air by eccentric side wall 811 these sides advances to exhausr port 81B along eccentric side wall 811 substantially abreast, but, in anti-eccentric side wall 812 these sides, from the air of aerofoil fan 82 air-supply with the vertical line of sloping portion 81C between the little direction of the angle that constituted contact sloping portion 81C, thereby make the mobile deterioration of air.But, as mentioned above, tilt by the deflation area 822 that makes aerofoil fan 82, promptly, make of the air supply direction inclination of the air supply direction of aerofoil fan 82 with respect to cooling system A, since the cooling air D (referring to Figure 11) by anti-eccentric side wall 812 will with the direction of the bigger angle of the vertical line formation of sloping portion 81C on contact sloping portion 81C, so can flow to exhausr port 81B swimmingly.

If adopt aerofoil fan 82, then as shown in figure 11, in gas exhaust duct 81, eccentric side by exhausr port 81B is promptly as the cooling air C of top eccentric side wall 811 these sides of gas exhaust duct 81, change direction to exhausr port 81B lentamente owing to the bloating next eccentric side wall 811 of gas exhaust duct 81, discharge from exhausr port 81B.

On the other hand, promptly below the cooling air D that anti-eccentric side wall 812 these sides below gas exhaust duct 81 are passed through is then running into, rise behind the sloping portion 81C, advance, discharge from exhausr port 81B along following horizontal component 81D at its opposition side.

Such exhaust unit 8 by screw retention to lower casing 22.Promptly, on plan view, to see the mode of intersecting with the part of lamp driver element 62, exhaust unit 8 is configured in the top of lamp driver element 62, and the bottom surface sections 22A that makes fixed part 841A～841C carry out being fixed to after the position alignment lower casing 22 goes up (referring to Fig. 7,9).

So, just can make the air entry 81A of exhaust unit 8 face the side of the illuminator 416 of light supply apparatus 411, exhausr port 81B is connected on the peristome 35 of front casing 23.

In addition, in the present embodiment, though air entry 81A is configured so that air entry 81A penetrates the parallel side of direction to the light of relative light supply apparatus 411 and covers, but, be not limited to this, light supply apparatus 411 does not hinder the light that penetrates from light supply apparatus 411 to suitable being arranged so that of air entry 81A relatively yet.For example, also can be arranged so that air entry and the relative light of light supply apparatus 411 is penetrated direction parallel any and cover with respect to the face that the light of light supply apparatus 411 penetrates an opposite side of direction.

(3) effect of example

If adopt as described above example, then have following effect.

(3-1) form the aperture area owing to exhausr port 81B forr a short time than the aperture area of air entry 81A, so promptly see under the situation of illuminator 416 from peristome 35 these sides of front casing 23 from the flow direction of cooling system A, owing to can reduce the part that to see within the illuminator 416, so can improve light-proofness, can also improve the discharge pressure of the cooling air that will discharge.In addition, owing to be the center configuration of exhausr port 81B center off-centre, so even if the leakage of the light of oriented outside also can avoid having the core of the light source of high briliancy from air entry.

(3-2), need not as being installed in exhausr port one side, make the extraction fan miniaturization so can guarantee sufficient exhaust performance because aerofoil fan 82 is installed to air entry 81A one side.

(3-3) because the air supply direction that makes aerofoil fan 82 is directed upwardly inclination with respect to the discharge of cooling air, and make the air-flow of cooling air D of air-flow by the cooling air C of sides above the gas exhaust duct 81 and the following side by gas exhaust duct 81 can obtain good balance, so can improve exhaust efficiency.

(3-4) since the aperture area of exhausr port 81B is become air entry 81A aperture area roughly half, so in the sufficient exhausr port size that can guarantee in order to the discharge cooling air, can also improve the shading efficient of exhausr port the biglyyest.

(3-5) owing to the eccentric side wall 811 that makes exhausr port 81B carry out eccentric gas exhaust duct 81 bloats laterally, and the feasible cooling air C that can reduce is with respect to the collision angle as the eccentric side wall 811 above the gas exhaust duct 81, change air-flow lentamente to exhausr port 81B, so can reduce frictional resistance, can discharge cooling air more sleekly by 811 generations of gas exhaust duct 81 eccentric side walls.

(3-6) since gas exhaust duct 81 have along with near its central authorities towards the air entry 81A shape that its internal diameter increases of advancing, on the other hand, near central authorities, towards the part that exhausr port 81B advances, has the shape of same internal diameter substantially, and make the air that can suck near exhausr port 81B, can the coalescence rectification discharge from wideer air entry 81A, so can realize the good exhaust unit of exhaust efficiency 8.In addition, by inner window shutter 83 is set, can also control discharge directions in exhausr port 81B.

(3-7) by in projector 1, using exhaust unit 8 of the present invention, suck cooling air by side from the light supply apparatus 411 of projector 1, can efficient cools light source lamp 416 well, and, can carry out shading to leak light, improve quality as projector from illuminator 416.In addition, make cooling air be discharged to the direction of leaving from the image projection zone of projector 1, so projected image well owing in exhausr port 81B, possessing inner window shutter 83.

(4) distortion of example

The present invention is not limited to above-mentioned example, also comprises distortion as follows.

In above-mentioned example, though gas exhaust duct 81 below constitute and comprise following sloping portion 81C and following horizontal component 81D,, the present invention is not limited to this.That is, also can below gas exhaust duct, become the shape that gently falls in.

In addition, in above-mentioned example, though the aperture area of exhausr port 81B is become substantially half of the aperture area of air entry 81A, and, make its center eccentric to upside, but the present invention is not limited to this, that is, the aperture area of exhausr port 81B and eccentric direction thereof can suit to determine.

In above-mentioned example, though what use is 2 lens arras 120,130 that the light of light source 110 are divided into a plurality of segment beams,, the present invention also can use in the projector that does not use such lens arra.

In above-mentioned example, though what illustrate is the example that uses the projector of liquid crystal panel as optic modulating device, but the present invention also can be at the modulating device that uses beyond the liquid crystal panel, for example constitutes in the projector of modulating device of pixel with minitype reflector and uses.

In above-mentioned example, though the example of the projector that is to use 3 optic modulating devices of explanation,, the present invention also can use in using the projector of 1,2,4 or above optic modulating device.

In above-mentioned example, though explanation is that the present invention is applied to example under the situation of projector of through mode, the present invention also can use in reflective projector.Here, so-called " through mode " means that the light valve of liquid crystal panel etc. is the type that sees through light, and so-called " reflective " means that then light valve is catoptrical type.Under the situation of opaque projector, light valve can only constitute with liquid crystal panel, and does not need a pair of polaroid.In addition, under the situation of opaque projector, the cross colour splitting prism can be used as the coloured light tripping device that illumination light is separated into the light of red, green, blue 3 looks, simultaneously, sometimes also can be used as once more the light of synthetic modulated 3 looks and the coloured light synthesizer that penetrates to same direction.In addition, also can use colour splitting prism rather than the use cross colour splitting prism that the colour splitting prism of a plurality of triangular prisms or quadrangular prism shape is combined.The present invention is being applied under the situation of reflective projector, also can obtaining the effect same substantially with the projector of through mode.In addition, light valve is not limited to liquid crystal panel, for example, also can be to use the light valve of minitype reflector.

As projector, carry out the front projector of image projection and carry out the rear projector of image projection though have from a side opposite with the direction of observing the projecting plane from the direction of observing the projecting plane,, the formation of above-mentioned example is no matter can use in any formation.

Claims (8)

1. electronic equipment, it possesses in casing: light source, have towards the air entry of above-mentioned light source and discharge from above-mentioned air entry suck to above-mentioned light source carry out cooled cooling air exhausr port gas exhaust duct and be installed in the above-mentioned air entry of above-mentioned gas exhaust duct and the extraction fan between the above-mentioned light source, it is characterized in that:

Little and center above-mentioned exhausr port is set to center off-centre with respect to above-mentioned air entry to above-mentioned exhausr port with respect to above-mentioned air entry aperture area,

The direction that the air supply direction of above-mentioned extraction fan is discharged from above-mentioned exhausr port with respect to cooling air tilts.

2. electronic equipment according to claim 1 is characterized in that:

Above-mentioned gas exhaust duct, direction one side at the center of above-mentioned exhausr port with respect to the center off-centre of above-mentioned air entry possesses the eccentric side wall;

Above-mentioned eccentric side wall is essentially surface level;

The deflation area of above-mentioned extraction fan, be inclined to make along with from above-mentioned air entry before above-mentioned exhausr port and then away from above-mentioned eccentric side wall.

3. electronic equipment according to claim 1 is characterized in that:

Above-mentioned gas exhaust duct possesses the eccentric side wall of direction one side of center off-centre of the above-mentioned relatively air entry in center of above-mentioned exhausr port;

Above-mentioned eccentric side wall bloats to direction one side of the center off-centre of the above-mentioned relatively air entry in the center of above-mentioned exhausr port;

The deflation area of above-mentioned extraction fan, be inclined to make along with from above-mentioned air entry before above-mentioned exhausr port and then away from above-mentioned eccentric side wall.

4. according to any one the described electronic equipment in the claim 1 to 3, it is characterized in that:

Above-mentioned gas exhaust duct possesses anti-eccentric side wall in a side opposite with the direction of the center off-centre of the relative above-mentioned air entry in center of above-mentioned exhausr port;

Above-mentioned anti-eccentric side wall possess be inclined to along with from above-mentioned air entry before above-mentioned exhausr port and then upwards state the close sloping portion of eccentric side wall;

Above-mentioned sloping portion is positioned at the above-mentioned pipeline suction side among the above-mentioned anti-eccentric side wall.

5. electronic equipment according to claim 4 is characterized in that:

Above-mentioned anti-eccentric side wall possesses and the substantially parallel wall of above-mentioned eccentric side wall in above-mentioned exhaust side.

6. according to any one the described electronic equipment in the claim 1 to 5, it is characterized in that: the aperture area of above-mentioned exhausr port be set to above-mentioned air entry aperture area basically half.

7. according to any one the described electronic equipment in the claim 1 to 6, it is characterized in that:

Possess window shutter with a plurality of vane plates,

Above-mentioned window shutter is installed on the above-mentioned exhausr port.

8. according to any one the described electronic equipment in the claim 1 to 7, it is characterized in that: above-mentioned electronic equipment is to possess the projector that the light beam that penetrates from above-mentioned light source according to the image information modulation formed and enlarged the projection optics picture.

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