JP2009145448A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector where cooling air from an air duct is surely sent to an optical unit by accurately positioning the air duct and the optical unit. <P>SOLUTION: The projector 1 includes the optical unit which modulates and projects luminous flux emitted from a light source part in accordance with an image signal, and the air duct 12 for guiding the cooling air to the optical unit. The air duct 12 has a positioning boss 130 for determining a relative position thereof to the optical unit, and surely cools the optical unit by making cooling air flows 53, 54 and 55 blow off to the optical unit positioned by the positioning boss 130. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector provided with a duct for guiding cooling air.

  2. Description of the Related Art Conventionally, there is known a cooling device that takes in cooling air from a single air inlet by a pair of fans, blows the taken cooling air through a duct, and cools a projection mechanism (an optical system or the like) of a projector. Since this cooling device introduces cooling air by a pair of fans, even if each fan is rotated at a low rotational speed, a sufficient air volume is secured, and a quiet operation is possible at a low rotational speed. Moreover, since the blowing direction from each fan is made into the same direction, the connection structure with a duct is simplified and the load of each fan is also reduced by smooth ventilation (for example, patent document 1).

JP 2006-72010 A

  However, in the prior art, the duct and the projection mechanism unit are individually attached, and the duct attachment standard and the projection mechanism part attachment standard are different. For this reason, the relative position between the duct and the projection mechanism unit may be shifted, and there is a problem that the cooling air from the duct is not sufficiently blown to a predetermined portion of the projection mechanism unit to be cooled.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following application examples or forms.

  Application Example 1 A projector according to this application example includes a projection mechanism unit that modulates and projects a light beam emitted from a light source unit according to an image signal, a duct that guides cooling air to the projection mechanism unit, The duct has a duct positioning portion for determining a relative position with respect to the projection mechanism portion.

  According to this projector, the duct is positioned so that relative displacement between the duct and the projection mechanism does not occur with respect to the projection mechanism having a function of modulating and projecting the light beam. A duct positioning part. Therefore, even if the duct and the projection mechanism unit, which are separate members, are individually attached to the attachment position based on the respective standards, the relative position between the duct and the projection mechanism unit is determined by this duct positioning unit. It is set accurately without deviation. That is, the cooling air that cools the projection mechanism is accurately guided by the duct to a predetermined location of the projection mechanism that needs to be cooled. As a result, the cooling air is not sent unnecessarily to a location where cooling is not required due to the positional deviation between the duct and the projection mechanism, and is efficiently supplied to a predetermined location where the projection mechanism is to be cooled. Therefore, the projector can efficiently cool the air by accurately distributing the cooling air to the projection mechanism portion positioned with the duct.

  Application Example 2 In the projector according to the application example described above, the duct positioning unit engages with a housing positioning unit provided in a housing unit that houses an optical modulation unit that modulates a light beam in the projection mechanism unit, and It is preferable to position the duct and the optical modulation unit.

  According to this configuration, the optical modulation unit of the projection mechanism unit is accommodated and disposed in the accommodation unit so that the optical axis is the same. In this case, the duct positioning portion is configured to engage with the housing positioning portion, and is positioned with the optical modulation portion via the housing portion. With such a positioning configuration, the cooling air supplied from the duct is accurately distributed so as to cool the optical modulation unit. Therefore, the projector can cool the main optical modulation unit in a focused manner and efficiently, and can maintain the function of the projection mechanism unit over a long period of time.

  Application Example 3 In the projector according to the application example described above, one of the duct positioning portion and the accommodation positioning portion has an engagement hole, and the engagement convex portion of the other is inserted into the engagement hole. It is preferable to perform positioning.

  According to this configuration, the engagement between the duct positioning portion and the housing positioning portion is a configuration in which the engaging convex portion is inserted into the engaging hole and is fitted, and either one is the engaging hole and the other is the other Is an engaging convex part. Such an engagement hole and an engagement convex part are the simple engagement systems by fitting, and the hole and convex cross-sectional shape to engage can be set without restrictions including circular shape etc. Therefore, it is possible to easily set each of the engagement holes and the engagement protrusions, and it is easy to perform assembly adjustment and the like.

  Application Example 4 In the projector according to the application example described above, it is preferable that the duct positioning portion has a cylindrical shape and has a configuration that guides the cooling air to the projection mechanism along the duct positioning portion.

  According to this configuration, the duct positioning unit not only performs positioning with the projection mechanism unit, but also has a cylindrical shape, so that the cooling air is efficiently supplied to the projection mechanism unit along the duct positioning unit, It is possible to reliably cool a predetermined portion such as the optical modulation portion positioned by the duct positioning portion.

Hereinafter, specific embodiments of the projector will be described with reference to the drawings. The projector according to the present embodiment includes a projection mechanism unit for modulating and projecting a light beam emitted from the light source unit according to an image signal, and a blower duct (duct) for guiding cooling air for cooling the projection mechanism unit. And has a feature in positioning the projection mechanism section and the air duct.
(Embodiment)

  FIG. 1A is a perspective view of the projector according to the present embodiment as viewed from the upper front side, and FIG. 1B is a perspective view of the projector as viewed from the lower front side. As shown in FIG. 1, the projector 1 has a substantially rectangular parallelepiped appearance, and has an upper exterior 2 and a lower exterior 3. The upper exterior 2 is disposed on the upper side of the projector 1 and forms an upper surface, a front surface, a back surface, a right side surface, and a left side surface. An upper surface of the upper exterior 2 is located on the left side of the rear surface and can be opened and closed to replace the lamp of the light source unit, and an operation for operating the projector 1 is located at the approximate center of the upper surface. An operation unit 2b having buttons, and a slide unit that can be freely opened and closed by an opening / closing handle 8a on the right side of the front side, enables projection of a light beam from the projection unit 45 in the open state, and a projection unit for dust or the like in the closed state And a projection cover 8 for preventing adhesion to 45.

  The lower exterior 3 forms the front, right side, left side, back and bottom surfaces of the projector 1. An intake port 6 for taking cooling air for cooling the projector 1 into the projector 1 is provided on the right side surface of the lower exterior 3, and an exhaust for exhausting the cooling air that has cooled the projector 1 is provided on the left side surface. A mouth 5 is provided. Further, on the lower surface 3 a of the lower exterior 3, 3 for adjusting the tilt of the light beam projected from the projection unit 45 by changing the inclination of the projector 1 to the front side center, the back side right side, and the back side left side. A leg portion 7 of the book and a receiving portion 9 corresponding to a remote control for wirelessly controlling the projector 1 are provided on the right side of the front side. The projector 1 is of a so-called front type that is installed on the same side as the side on which a screen or the like on which a light beam is projected is viewed.

  Next, the internal configuration accommodated in the upper exterior 2 and the lower exterior 3 of the projector 1 will be described. FIG. 2 is a perspective view showing an internal configuration of the projector. As shown in FIG. 2, the projector 1 sucks and takes in cooling air from the intake port 6, and intake air from the intake port 6 and the two intake fans 10 and 11 provided on the bottom surface 3 b of the lower exterior 3. And an intake duct (not shown) for guiding the cooling air to the fans 10 and 11. The intake fans 10 and 11 are provided on the front side of the right side surface of the bottom surface 3b, and are provided on the front side intake fan 10 having the cooling air introduction port 10a and on the back side of the right side surface. 2, the intake duct is not shown in FIG. 2 in order to display the intake fans 10 and 11 in an easy-to-understand manner, but is directed from the intake port 6 toward the front and back of the projector 1. And extended to the inlets 10a and 11a.

  Further, the projector 1 includes a projection unit 45 that projects a light beam adjacent to the front-side intake fan 10, a power supply unit 14 that is located on the left side of the front surface of the lower exterior 3 and has one end facing the exhaust port 5, An exhaust unit 13 positioned obliquely opposite to the exhaust port 5 on the back side of the unit 14, and an optical unit (projection mechanism) arranged in an approximately L shape when viewed from the upper surface side from the exhaust unit 13 to the projection unit 45. Part) 4 (41, 42, 43, 44). The optical unit 4 is accommodated in a substantially L-shaped unit housing (accommodating portion) 40 and attached to the bottom surface 3 b of the lower exterior 3. Then, the projector 1 guides the cooling air taken in by the intake fans 10 and 11 to cool the optical unit 4, and a blower duct (duct) 12 provided on the lower side of the unit housing 40, and the optical unit 4 includes a control board 15 provided above 4, and a connector section 16 provided on the back side of the control board 15 and having several terminals for connecting an external device and the projector 1.

  The optical unit 4 which is a main part of the projector 1 is an integrator illuminating unit 41 having a light source unit in the vicinity of the exhaust unit 13, a color separating unit 42, a relay optical unit 43, and three liquid crystal panels (not shown). And an optical modulation unit 44 having an optical modulation element as an optical modulation element, and the optical modulation unit 44 is connected to the projection unit 45. In FIG. 2, three FPCs (flexible printed circuit boards) 46 that connect the liquid crystal panel and the control board 15 are shown.

  Hereinafter, the optical unit 4 will be described in detail. FIG. 3 is a schematic diagram showing the configuration of the optical unit. The integrator illuminating unit 41 is an optical system for illuminating the image forming areas of the three liquid crystal panels 441 constituting the optical modulating unit 44 substantially uniformly, and includes a light source unit 411, a first lens array 412, A lens array 413, a polarization conversion element 414, and a superimposing lens 415 are provided. The three liquid crystal panels 441 are a liquid crystal panel 441R that modulates red light, a liquid crystal panel 441G that modulates green light, and a liquid crystal panel 441B that modulates blue light.

  The light source unit 411 includes a light source lamp 416 as a radiation light source and a reflector 417. A radial light beam emitted from the light source lamp 416 is reflected by the reflector 417 to be a parallel light beam, and the parallel light beam is emitted to the outside. . In this case, a halogen lamp is used as the light source lamp 416. In addition to the halogen lamp, a metal halide lamp, a high-pressure mercury lamp, or the like can be used. Although the parabolic mirror is employ | adopted as the reflector 417, you may employ | adopt what combined the parallelizing concave lens and the ellipsoidal mirror instead of the parabolic mirror.

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

  The second lens array 413 has substantially the same configuration as 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 superimposing lens 415.

  The polarization conversion element 414 is disposed between the second lens array 413 and the superimposing lens 415 and is unitized with the second lens array 413. Such a polarization conversion element 414 converts the light beam from the second lens array 413 into a single type of polarized light, thereby increasing the efficiency of use of the light beam in the optical modulation unit 44.

  More specifically, each partial light converted into one kind of polarized light by the polarization conversion element 414 is finally superimposed on the liquid crystal panel 441 of the optical modulation unit 44 by the superimposing lens 415. In the projector 1 using the liquid crystal panel 441 of the type that modulates polarized light, only one type of polarized light can be used, so almost half of the light flux from the light source lamp 416 that emits other types of randomly polarized light is not 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, and the light use efficiency in the optical modulation unit 44 is increased.

  The color separation unit 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination unit 41 by the dichroic mirrors 421 and 422 are converted into red (R) and green (G ) And blue (B).

  The relay optical unit 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 color light separated by the color separation unit 42, to the liquid crystal panel 441R. Yes.

  At this time, the dichroic mirror 421 of the color separation unit 42 transmits the red light component and the green light component of the light beam emitted from the integrator illumination unit 41, and reflects the blue light component. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches the blue liquid crystal panel 441B. The field lens 418 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis. The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441R.

  Of the red light and green light transmitted 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 dichroic mirror 422, passes through the relay optical unit 43, passes through the field lens 418, and reaches the liquid crystal panel 441R for red light. Note that the relay optical unit 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light use efficiency due to light diffusion or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 418 as it is.

  The optical modulation unit 44 modulates an incident light beam according to image information to form a color image, and includes three incident-side polarizing plates 442 on which the respective color lights separated by the color separation unit 42 are incident. , Liquid crystal panels 441R, 441G, 441B arranged at the rear stage of each incident side polarizing plate 442, emission side polarizing plate 443 arranged at the rear stage of each liquid crystal panel 441R, 441G, 441B, and optical system for color synthesis And a cross dichroic prism 444.

  The liquid crystal panels 441R, 441G, 441B use polysilicon TFTs as switching elements. In the optical modulation unit 44, each color light separated by the color separation unit 42 is modulated according to image information by the three liquid crystal panels 441R, 441G, 441B, the incident side polarizing plate 442, and the emission side polarizing plate 443. The optical image is formed.

  The incident-side polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation unit 42 and absorbs other light beams. A polarizing film is attached to a substrate such as sapphire glass. It is a thing. The exit-side polarizing plate 443 is configured in substantially the same manner as the incident-side polarizing plate 442, and transmits only polarized light in a predetermined direction out of the light beams emitted from the liquid crystal panel 441 (441R, 441G, 441B), and transmits the other light beams. Absorb. The incident side polarizing plate 442 and the exit side polarizing plate 443 are set so that the directions of the polarization axes thereof are orthogonal to each other.

  The cross dichroic prism 444 forms a color image by synthesizing optical images emitted from the emission-side polarizing plate 443 and modulated for each color light. The cross dichroic prism 444 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the multilayer film. The color image synthesized by the cross dichroic prism 444 is enlarged and projected by the projection lens of the projection unit 45.

  Next, FIG. 4 is a perspective view showing the arrangement of the intake fan, the duct, the unit housing, and the optical modulation unit. As shown in FIG. 4, the bottom surface 3b of the lower exterior 3 is connected to the two intake fans 10 and 11 along the right side and the intake fans 10 and 11, respectively, and the cooling air from the intake fans 10 and 11 is received. A blower duct 12 for blowing air is provided. The air duct 12 is fixed to the bottom surface 3b through a plurality of fixing portions 120 (see FIGS. 4 and 6) formed so as to protrude from the air duct 12. Further, the unit housing 40 is disposed at the upper part of the air duct 12 in a state where a part of the unit housing 40 overlaps the air duct 12, and is fixed to the standing pins 31, 32 and the like standing from the bottom surface 3b.

  The unit housing 40 accommodates an optical modulation unit 44 that is a main part of the optical unit 4 in a portion overlapping with the air duct 12 and is subjected to intensive cooling in order to maintain the function of modulating the light flux. And a support frame 40a for supporting the projection unit 45 (FIG. 2) connected to the cross dichroic prism 444 of the optical modulation unit 44. The cross dichroic prism 444 has a surface for emitting a color image obtained by combining the three color lights facing the support frame 40a. A liquid crystal panel 441B and a liquid crystal panel are provided on each of the left and right and back surfaces of the surface facing the support frame 40a. A panel 441R and a liquid crystal panel 441G are respectively attached. In addition, in the front direction of the lower exterior 3 with respect to the support frame 40a, a support base 33 that supports the projection unit 45 together with the support frame 40a is erected from the bottom surface 3b.

  Next, FIG. 5 is a perspective view showing the flow of cooling air in the intake fan and the air duct. FIG. 5 shows the flow of cooling air guided by the air duct 12 with the optical modulator 44 depicted in FIG. 4 removed. As shown in FIG. 5, the cooling air sent from the front side intake fan 10 to the air duct 12 forms a cooling air flow 50 and flows into the inflow portion 121 of the air duct 12. The cooling air flow 50 is divided into two cooling air flows 50 a and 50 b and flows in the air duct 12. The divided cooling air flow 50a is blown out as the cooling air flow 53 and the cooling air flow 55 from the blower duct 12 toward the unit housing 40, and the cooling air flow 53 cools and cools the vicinity of the liquid crystal panel 441R (FIG. 4). The air flow 55 cools the vicinity of the liquid crystal panel 441B (FIG. 4). Further, the cooling air flow 50 b is guided to the position of the polarization conversion element 414 (FIG. 3) of the integrator illuminating unit 41 by the air duct 12, and blows out from the air duct 12 as the cooling air flow 52 to cool the vicinity of the polarization conversion element 414. .

  On the other hand, the cooling air sent from the back side intake fan 11 to the air duct 12 forms a cooling air flow 51 and flows into the inflow portion 122 of the air duct 12. Then, the cooling air flow 51 is blown out from the air duct 12 toward the unit housing 40 as the cooling air flow 54 and the cooling air flow 55, and the cooling air flow 54 cools and cools the vicinity of the liquid crystal panel 441G (FIG. 4). The air flow 55 cools the vicinity of the liquid crystal panel 441B. Here, the cooling air flow 55 is formed by both the cooling air flow 50a and the cooling air flow 51, and a sufficient air volume for cooling the vicinity of the liquid crystal panel 441B apart from the intake fans 10 and 11 is secured. It has become so.

  Next, the air duct 12 will be described in further detail. FIG. 6 is a perspective view showing the air duct attached to the lower exterior, and is a view in which the unit housing 40 depicted in FIG. 5 is deleted. FIG. 7 is a perspective view showing in detail a single unit of the air duct, and is a view of the air duct 12 seen from the side attached to the bottom surface 3b of the lower exterior 3. As shown in FIGS. 6 and 7, the air duct 12 is provided with an outlet for blowing cooling air in the direction of the unit housing 40 (FIG. 5). The outlets are an outlet 123 for blowing out the cooling air stream 50b flowing in from the inlet 121 as the cooling air stream 52, and an outlet for blowing out the cooling air stream 50a flowing in from the inlet 121 as the cooling air stream 53. 124, an outlet 126 for blowing out the cooling air stream 50a as the cooling air stream 55, an outlet 125 for blowing out the cooling air stream 51 flowing in from the inlet 122 as the cooling air stream 54, and a cooling air stream And an outlet 126 for blowing out 51 as a cooling air flow 55.

  The air duct 12 distributes the cooling air sent from the intake fans 10 and 11 to the outlets 123, 124, 125, and 126, respectively, so that the cooling air flows 50, 51, 52, 53, 54, and 55 are provided. A partition wall partitioned so as to form a flow, a through pin hole 128 through which the standing pin 32 standing from the lower exterior 3 passes, and a relief portion 129 for avoiding interference with the standing pin 31 Have. The air duct 12 has a cylindrical positioning boss (for positioning the lower exterior 3 and the unit housing 40 (FIG. 4) at the position of the cross dichroic prism 444 (FIG. 4) of the optical modulation unit 44. A duct positioning part) 130 is provided. The positioning boss 130 engages with the unit housing 40 at one end of the cylindrical shape and engages with the lower exterior 3 at the other end of the cylindrical shape. A stepped portion 130b. Details of these engagements will be described later with reference to FIG.

  In this case, the positioning boss 130 is positioned with respect to the unit housing 40 by the engaging convex portion 130a, and the position of the positioning boss 130 with the cross dichroic prism 444 of the optical modulation unit 44 (FIG. 4) accommodated in the unit housing 40. Is set correctly. Accordingly, the air duct 12 is also accurately positioned with the liquid crystal panel 441 attached to the cross dichroic prism 444. Therefore, the outlet 124, the outlet 125, and the outlet 126 arranged in the vicinity of the positioning boss 130 are the cooling air flow 53, the cooling air flow 54, and the liquid crystal panel 441R, the liquid crystal panel 441G, and the liquid crystal panel 441B. Each cooling air flow 55 can be accurately guided. That is, the cooling air does not flow unnecessarily to places where cooling is unnecessary, and the cooling air can cool the optical modulation unit 44 efficiently and reliably.

  As shown in FIG. 7, the positioning boss 130 has a cylindrical periphery on the side of the stepped portion 130b that engages with the lower exterior 3 to provide a space for the cooling air flow 50a to flow. Therefore, the cooling air flow 50a flows along the positioning boss 130 in the direction of the outflow port 124 or the outflow port 126, and is blown out toward the optical modulation unit 44 (FIG. 4) as the cooling air flow 53 or the cooling air flow 55. It has become. In this way, since the positioning boss 130 is formed in a cylindrical shape, the air duct 12 can efficiently flow the cooling air flow 50 a along the positioning boss 130 without being blocked by the positioning boss 130. It is a possible configuration. Therefore, the outlet 124 and the outlet 126 can be provided in the immediate vicinity of the positioning boss 130, and the cooling air can be distributed to the optical modulation unit 44 more accurately and efficiently.

  Next, details of the engagement by the positioning boss 130 will be described. FIG. 8 is a cross-sectional view showing the positioning of the air duct, the lower exterior, and the unit housing by the positioning boss. As shown in FIG. 8, the lower exterior 3 is provided with a step receiving portion 3 c that is a cylindrical hole for engaging with the step portion 130 b of the positioning boss 130, and the unit housing 40 has a positioning boss 130. An engaging hole 40b (accommodating positioning portion) which is a circular through hole for engaging with the engaging convex portion 130a is provided. The air duct 12 and the unit housing 40 are fixed to the lower exterior 3 by the fixing portion 120 (FIG. 6) with reference to the positioning by the engaging protrusions 130a and the engaging holes 40b. The housing 40 is fixed to standing pins 31 and 32 (FIG. 4) and the like that are erected on the lower exterior 3.

  Thus, even if the air duct 12 and the unit housing 40 are individually attached to the lower exterior 3, the relative position is always maintained by the positioning by the engagement of the engagement protrusion 130 a and the engagement hole 40 b. Arranged without shifting. Therefore, the cooling air introduced from the intake port 6 (FIG. 2) is accurately and efficiently distributed to the optical modulation unit 44 (FIG. 2) of the optical unit 4 through the air duct 12 to ensure the optical modulation unit 44. Can be cooled to. In this configuration, the intake port 6, the intake fans 10 and 11, the air duct 12, the exhaust unit 13, and the exhaust port 5 function as a cooling device.

  Hereinafter, main effects of the embodiment will be described together.

  In the projector 1, the air duct 12 and the unit housing 40 that accommodates the optical unit 4 each have a positioning boss 130 as a positioning portion and an engagement hole 40 b. By these positioning portions, the air duct 12 and the optical modulation portion 44 of the optical unit 4 are accurately arranged without positional deviation. As a result, the cooling air is accurately guided to the optical modulation unit 44 through the air duct 12, and the optical modulation unit 44 can be efficiently cooled.

  Further, the positioning portion is a system in which the cylindrical engagement convex portion 130a of the positioning boss 130 is engaged with the circular engagement hole 40b by fitting, and the circular engagement hole 40b and the engagement convex portion 130a are engaged. Can be easily formed, and can be easily mounted by engaging each other.

  The air duct 12 has outlets 124, 125, 126 in the vicinity of the positioning boss 130 for positioning with respect to the optical modulation unit 44, and the cooling air from the two intake fans 10, 11 is sent to the cylindrical positioning boss. The air can be distributed along 130. Accordingly, the cooling air can be blown out from each of the outlets 124, 125, and 126 to the optical modulation unit 44 positioned by the positioning boss 130 accurately and efficiently, and the optical modulation unit 44 can be efficiently cooled.

  Further, the projector 1 is not limited to the above-described embodiment, and the same effects as those of the embodiment can be obtained even if the projector 1 is in the form of the following modification.

  The positioning boss 130 of the air duct 12 is cylindrical, and has a simple configuration in which the engagement protrusion 130a of the positioning boss 130 is inserted into the engagement hole 40b of the unit housing 40 and positioned. However, the air duct 12 is not limited to this configuration, and may have a configuration in which the engagement convex portion 130 a is formed in the unit housing 40 and the engagement hole 40 b is formed in the positioning boss 130. Furthermore, other positioning methods may be used, such as a mode in which the pins are passed through holes provided in the air duct 12 and the unit housing 40 to position the air duct 12 and the unit housing 40, respectively.

  In addition, the positioning boss 130 of the air duct 12 is positioned with the unit housing 40 at the position of the optical modulator 44, but is positioned with the unit housing 40 at other positions. Also good. If the unit housing 40 accurately accommodates the optical unit 4, the cooling air can be accurately blown out to the optical modulation unit 44.

  The intake fans 10 and 11 introduce cooling air from the intake port 6 provided on the right side surface of the projector 1 and send it to the air duct 12. The intake ports 10 a and 11 a of the intake fans 10 and 11 are provided in the lower exterior. 3 may be configured such that an intake port is provided on the lower surface 3a toward the lower surface 3a side. Thus, the projector 1 has a simple configuration that does not require an intake duct. Further, the number of intake fans 10 and 11 is not limited to two, and may be three or more or only one.

  The projector 1 uses the liquid crystal panel 441 as the optical modulation unit 44, but may use a device such as a micromirror other than the liquid crystal panel 441.

(A) The perspective view which looked at the projector concerning this embodiment from the front upper direction, (b) The perspective view which looked at the projector from front lower direction. The perspective view which shows the structure inside a projector. The schematic diagram which shows the structure of an optical unit. The perspective view which shows arrangement | positioning of an intake fan, a duct, a unit housing | casing, and an optical modulation part. The perspective view which shows the flow of the cooling air in an intake fan and a ventilation duct. The perspective view which shows the ventilation duct attached to the lower exterior. The perspective view which shows the simple substance of a ventilation duct in detail. Sectional drawing which shows positioning with the ventilation duct by a positioning boss | hub, a lower exterior, and a unit housing | casing.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Upper exterior, 3 ... Lower exterior, 3a ... Lower surface, 3b ... Bottom, 3c ... Step part, 4 ... Optical unit, 5 ... Exhaust port, 6 ... Intake port, 10, 11 ... Intake fan, DESCRIPTION OF SYMBOLS 12 ... Air duct, 13 ... Exhaust unit, 31, 32 ... Standing pin, 40 ... Unit housing | casing, 40b ... Engagement hole, 50, 51, 52, 53, 54, 55 ... Cooling air flow, 120 ... Fixed part 121, 122 ... inflow part, 123, 124, 125, 126 ... outlet, 130 ... positioning boss, 130a ... engagement convex part, 130b ... step part.

Claims (4)

A projection mechanism unit that modulates and projects a light beam emitted from the light source unit according to an image signal;
A duct for guiding cooling air to the projection mechanism, and a projector,
The projector according to claim 1, wherein the duct includes a duct positioning unit for determining a relative position with respect to the projection mechanism unit. The projector according to claim 1, wherein
The duct positioning unit engages with a housing positioning unit provided in a housing unit that houses an optical modulation unit that modulates a light beam in the projection mechanism unit, and positions the duct and the optical modulation unit. A projector characterized by that. The projector according to claim 1 or 2,
One of the duct positioning portion and the accommodation positioning portion has an engaging hole, and the engaging convex portion of the other is inserted into the engaging hole for positioning. The projector according to claim 3, wherein
The duct positioning unit has a cylindrical shape, and is configured to guide the cooling air to the projection mechanism unit along the duct positioning unit.

Images