JP2013101405A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector able to improve cooling efficiency for an object to be cooled even in the case where an axial fan is reduced in size and thickness, and also able to ensure silence.SOLUTION: A projector 1 comprises: an axial fan 6 having a plurality of vanes 61 arranged around a predetermined rotation axis Ax and configured to suck and expel air along the rotation axis Ax by the rotation of the vanes 61 around the rotation axis Ax; and a suction side member 512A provided on the air suction side of the axial fan 6. The suction side member 512A is provided with a cylindrical air introduction part 514 for introducing outside air into the axial fan 6. The air introduction part 514 has a bevel 514A inclined to the rotation axis Ax and rectifies introduced air toward the vanes 61.

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, in projectors, a configuration is known in which an object to be cooled such as a light source device housed in an exterior housing is cooled using an axial fan (see, for example, Patent Document 1).
An axial fan described in Patent Document 1 includes a plurality of blades, a blade support member that is rotatably supported around a predetermined rotation axis and supports the base end portions of the plurality of blades, and an outside of the plurality of blades. A surrounding case. The axial fan sucks air in the vicinity of the light source device from the suction port formed in the case and discharges it from the discharge port formed in the case by the rotation of the blade support member in which a plurality of blades are integrated.

JP 2007-170413 A

By the way, as an axial fan, by reducing the resistance when air is sucked in, air is smoothly sucked in, air in the vicinity of the cooling target is efficiently sucked in, and the cooling efficiency of the cooling target is improved. A structure that secures safety is adopted.
For example, as the structure, a structure employing a so-called bell mouth shape in which the opening area of the suction port is increased toward the suction side can be exemplified.
However, in recent years, the axial fan has been reduced in size and thickness in response to a request for downsizing the projector, and thus the thickness of the case has also been reduced.
That is, there is a problem that the bell mouth shape does not function sufficiently because the portion forming the bell mouth shape is also small.

  An object of the present invention is to provide a projector capable of improving the cooling efficiency of a cooling target and ensuring quietness even when the axial fan is reduced in size and thickness.

  The projector of the present invention is a projector that modulates a light beam emitted from a light source device according to image information to form an image, and projects the formed image, and a plurality of blades arranged around a predetermined rotation axis An axial fan that sucks and discharges air along the rotation shaft by rotating the plurality of blades around the rotation shaft, and a suction side member provided on the air suction side of the axial fan A cylindrical air introduction part for introducing external air into the axial flow fan and air introduced through the air introduction part toward the plurality of blades. An air rectifying unit for rectifying is provided.

  In the present invention, the suction side member provided on the air suction side of the axial flow fan is provided with the above-described air introduction part and air rectification part. In other words, the air rectifying unit is provided on the suction side member which is a separate member from the axial fan. Thus, even when the axial fan is reduced in size and thickness, the suction side member, which is a separate member from the axial fan, can reduce the resistance when air is sucked, that is, smooth. The air can be sucked into the axial fan, the air in the vicinity of the cooling object can be efficiently sucked into the axial fan to improve the cooling efficiency of the cooling object, and the noise caused by the driving of the axial fan Can be suppressed and quietness can be secured.

  In the projector according to the aspect of the invention, the suction side member may be formed in a plate shape having a plate surface inclined with respect to the rotation axis and extending along a radial direction from the rotation axis, A first light-shielding part that closes the part is provided, and the first light-shielding part is located on the rotating shaft side and is arranged at a plurality of first angles along a rotation direction around the rotational axis. A center-side light-shielding portion, and a plurality of the light-shielding portions that are located on the side away from the rotation shaft with respect to the center-side light-shielding portion and are arranged at each second angle smaller than the first angle along the rotation direction. It is preferable to provide an outer light shielding part.

In the present invention, the suction side member is provided with the first light shielding portion described above. As a result, even when a structure in which an axial fan is disposed in the vicinity of the exhaust port formed in the exterior casing is employed, the exterior casing exterior via the air introduction part, the axial fan, and the exhaust port. The light that leaks out can be shielded by the first light shield.
Further, since the first light shielding portion is formed so that the plate surface is inclined with respect to the rotation axis, the air resistance is reduced while shielding the light described above, and the axial flow fan is passed through the air introducing portion. Air can be inhaled well.
Further, the first light-shielding portion is positioned on the side away from the rotation axis, and a plurality of center-side light-shielding portions that are located on the rotation axis side and arranged at each first angle along the rotation direction around the rotation axis. And a plurality of outer light-shielding portions arranged at every second angle smaller than the first angle. Thus, for example, the first light-shielding part is separated from the rotation axis by the first light-shielding part (a plurality of outer light-shielding parts), as compared with a configuration in which the first light-shielding part extends radially from the rotation shaft side to the inner edge of the air introduction part The light shielding area on the side can be increased to sufficiently shield the light described above.

In the projector according to the aspect of the invention, the air rectification unit may be a slope formed in the air introduction unit, and the slope may be formed so that an internal opening area increases as the distance from the axial flow fan increases. It is preferable.
In the present invention, the air rectification unit is a slope formed in the air introduction unit. For this reason, an air rectification part can be formed only by forming a slope so that an internal opening area may become large as it leaves | separates from an axial fan, and simplification of the structure of a suction side member can be achieved.

  In the projector according to the aspect of the invention, the axial fan includes an impeller in which the plurality of blades are integrated on an outer periphery and rotates around the rotation shaft, and the impeller is rotatably supported around the rotation shaft. It is preferable that the suction side member is provided with a second light shielding portion that covers the impeller and closes a part of the inside of the air introduction portion.

By the way, the axial fan has a driver circuit for rotating the impeller provided on the air discharge side with respect to the impeller.
In the present invention, the suction side member is provided with the above-described second light shielding portion. Thereby, the light incident on the impeller through the air introduction part can be shielded by the second light shielding part. For this reason, the temperature rise of the impeller due to the incidence of light on the impeller, and consequently the temperature rise of the driver circuit or the like can be avoided, and the malfunction of the axial fan can be suppressed.

In the projector according to the aspect of the invention, it is preferable that the air rectification unit is formed in the second light shielding unit in a conical shape in which a cross-sectional area decreases as the distance from the axial flow fan increases.
In the present invention, as described above, the air rectifying unit is formed in the second light-shielding unit in a conical shape so that the cross-sectional area decreases as the distance from the axial fan increases. Accordingly, for example, as described above, an air rectification unit (hereinafter referred to as a first air rectification unit) is formed in the air introduction unit, and an air rectification unit (hereinafter referred to as a second air rectification unit) is also formed in the second light shielding unit. The air separated from the rotating shaft can be smoothly sucked into the axial flow fan by the first air rectifying unit, and the air near the rotating shaft is also shafted by the second air rectifying unit. The flow fan can be inhaled smoothly. For this reason, the effect that the cooling efficiency of the cooling object described above can be improved and quietness can be ensured can be further suitably achieved.

  In the projector according to the aspect of the invention, an exterior casing that constitutes an exterior is provided, and the exterior casing includes a casing main body having a replacement opening that allows the light source device to be attached to and detached from the inside and outside of the exterior casing, and the casing A replacement lid that is detachably attached to the main body and closes the replacement opening, and the suction lid member is integrally formed on the replacement lid, and the shaft A flow fan is preferably attached.

  In the present invention, the suction lid member is integrally formed on the replacement lid, and the axial fan is attached. As a result, the light source device can be replaced with a new light source device by simply removing the replacement lid from the housing body, and the axial fan can be replaced with a new axial fan so that the projector can be easily maintained. .

FIG. 2 is a perspective view illustrating an appearance of the projector according to the first embodiment. The perspective view which shows the external appearance of the projector in the said embodiment. The figure which shows typically the internal structure of the projector in the said embodiment. The figure which shows the structure of the cover body for replacement | exchange in the said embodiment, and an axial fan. The figure which shows the structure of the cover body for replacement | exchange in the said embodiment, and an axial fan. The figure which shows the structure of the cover body for replacement | exchange in the said embodiment, and an axial fan. The figure which shows the structure of the cover body for replacement | exchange in the said embodiment, and an axial fan. Sectional drawing which shows the structure of the cover body for replacement | exchange and axial fan in 2nd Embodiment.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Schematic configuration of projector]
1 and 2 are perspective views showing an appearance of the projector 1 in the first embodiment. Specifically, FIG. 1 is a perspective view of the projector 1 viewed from the upper front side, and FIG. 2 is a perspective view of the projector 1 viewed from the upper rear side.
Note that “upper”, “lower”, “left”, and “right” described below correspond to up, down, left, and right in the drawing view of FIG. In addition, “front” and “back” described below have the projection side (the side where the projection lens 34 is disposed) in the projector 1 as the front and the opposite side as the back.

The projector 1 forms an image according to image information and projects it on a screen (not shown). As shown in FIG. 1 or FIG. 2, the projector 1 is roughly configured by an exterior casing 2 that constitutes an exterior and an optical unit 3 (see FIG. 3) that is housed inside the exterior casing 2.
The exterior housing 2 includes a top surface portion 21 and a bottom surface portion 22 that intersect in the vertical direction, a front surface portion 23, a back surface portion 24, a right side surface portion 25, and a left side surface portion 26, and has a substantially rectangular parallelepiped shape. And the exterior housing | casing 2 accommodates the optical unit 3 grade | etc.,. As shown in FIG. 1 or 2, the exterior housing 2 includes a housing body 4 and a replacement lid 5.

The housing body 4 is a part that houses the optical unit 3 and the like.
In the housing body 4, an image passage opening 231 for allowing an image projected from a projection lens 34 (to be described later) of the optical unit 3 to pass through is formed in the front surface portion 23 as shown in FIG. .
In the housing body 4, a replacement opening 241 (see FIG. 3) that allows a light source device 31 (to be described later) of the optical unit 3 to be attached to and detached from the inside and outside of the housing body 4 is formed on the back surface portion 24.

As shown in FIG. 1, the replacement lid 5 is attached to the back side of the housing body 4, thereby constituting part of the top surface portion 21, the bottom surface portion 22, the back surface portion 24, and the right side surface portion 25. . Further, the replacement lid 5 is attached to the housing body 4 to close the replacement opening 241 of the housing body 4.
That is, the light source device 31 can be replaced with a new light source device 31 through the replacement opening 241 by removing the replacement lid 5 from the housing body 4.
In addition, two axial fans 6 for sucking air in the vicinity of the light source device 31 and discharging it to the outside are attached to the replacement lid 5 (FIG. 2).
That is, the two axial fans 6 suck in the air in the vicinity of the light source device 31 and discharge the air to the outside, thereby cooling the light source device 31 and preventing the interior of the exterior housing 2 from becoming high temperature. .
The specific configuration of the replacement lid 5 and the axial fan 6 will be described later.

[Configuration of optical unit]
FIG. 3 is a diagram schematically showing the internal configuration of the projector 1.
The optical unit 3 forms and projects an image according to image information under the control of a control device (not shown).
As shown in FIG. 3, the optical unit 3 includes a light source device 31 having a light source lamp 311 and a reflector 312 and disposed at a position facing the replacement opening 241; lens arrays 321, 322; 323, an illumination optical device 32 having a superimposing lens 324, a color separation optical device 33 having dichroic mirrors 331 and 332, and reflection mirrors 333 to 336, three liquid crystal panels 341 as light modulators, and three incident sides The optical device 34 includes a polarizing plate 342, three exit-side polarizing plates 343, and a cross dichroic prism 344 as a color synthesis optical device, and a projection lens 35 as a projection optical device.

In the optical unit 3, the light beam emitted from the light source device 31 and passing through the illumination optical device 32 is separated into three color lights of R, G, and B by the color separation optical device 33 by the configuration described above. Each separated color light is modulated by each liquid crystal panel 341 according to image information, and an image for each color light is formed. The image for each color light is synthesized by the cross dichroic prism 344 and projected onto a screen (not shown) by the projection lens 35.
In addition, about each member 31-35 mentioned above, since it is utilized as an optical system of various general projectors, concrete description is abbreviate | omitted.

[Configuration of axial fan]
4 to 7 are views showing the configuration of the replacement lid 5 and the axial fan 6. FIG. Specifically, FIG. 4 is a perspective view of the replacement lid body 5 to which the axial fan 6 is attached as seen from the back side, and FIG. 5 is a perspective view of the front side (back side) as seen from FIG. FIG. 7 is a view showing a cross section cut in the vertical direction.
First, before describing the configuration of the replacement lid 5, the configuration of the axial fan 6 will be described.
The two axial fans 6 have the same structure, and include a plurality of blades 61, an impeller 62, and a fan housing 63 as shown in FIG. 6 or 7.

The plurality of blades 61 all have the same shape, and are arranged at a predetermined pitch along a rotation direction around a rotation axis Ax (FIGS. 5 and 7), which will be described later. It projects while twisting at a predetermined angle toward.
The impeller 62 is rotatably supported with respect to the fan housing 63. Although not specifically shown, the impeller 62 has a bottomed cylindrical shape.

The fan housing 63 accommodates therein an impeller 62 in which a plurality of blades 61 are integrated. The fan housing 63 includes a housing body 631 and a holder 632.
The housing body 631 has a rectangular shape in plan view, and is configured by a cylindrical body having a hole with a circular cross section penetrating in the front-rear direction. And the impeller 62 in which the several blade | wing 61 was integrated is arrange | positioned inside the cylindrical body of the housing body 631.
That is, as shown in FIG. 6 or FIG. 7, the front end of the housing body 631 functions as a suction port 63A for sucking air, and the rear end of the casing main body 631 discharges air for discharging air. It functions as 63B.
As shown in FIG. 6 or 7, the suction port 63 </ b> A is formed so that the opening area increases toward the front side. Similarly, the discharge port 63B is formed so that the opening area increases toward the back side.

The holder 632 is provided on the discharge port 63B side of the housing main body 631, and rotatably supports an impeller 62 in which a plurality of blades 61 are integrated.
As shown in FIG. 6 or FIG. 7, the holder 632 includes a holder main body 632A, a plurality of fixing portions 632B, and a shaft portion 632C (FIG. 7).
The holder main body 632 </ b> A has a disk shape having the same planar shape as the impeller 62, and is disposed at a position covering the back side of the impeller 62.
Although not specifically shown, the plurality of fixing portions 632B protrude from the outer edge of the holder body 632A and are connected to the discharge port 63B side of the housing body 631.
The shaft portion 632C has a cylindrical shape that protrudes from the end surface on the front surface side of the holder main body 632A, and rotatably supports the impeller 62. That is, the columnar axis in the shaft portion 632C corresponds to the rotation axis Ax.

Although not specifically shown, a permanent magnet magnetized in multiple poles along the circumferential direction around the rotation axis Ax is fixed to the inner peripheral portion of the impeller 62, and the outer peripheral portion of the shaft portion 632C. Are provided with a coil, a yoke that is magnetized in multiple poles along the circumferential direction around the rotation axis Ax by energizing the coil.
In addition, a driver circuit (circuit board) that is supplied with electric power from the outside via a lead wire and energizes the coil is disposed at the base end portion of the shaft portion 632C.
The axial fan 6 has an impeller 62 in a predetermined direction around the rotation axis Ax by the interaction between the yoke magnetized by energization of the coil and the permanent magnet under the control of the driver circuit. Rotate to. As the impeller 62 rotates, air is sucked in through the suction port 63A and discharged through the discharge port 63B by the plurality of blades 61.

[Configuration of replacement lid]
Next, the configuration of the replacement lid 5 will be described with reference to FIGS.
As shown in FIGS. 4 to 7, the replacement lid 5 includes a lid body 51 and a discharge side member 52 (FIGS. 4, 6, and 7).
The lid body 51 is a part attached to the exterior housing 2, and as shown in FIG. 4 or 5, the lid body 51 has a substantially rectangular shape when viewed from the back side, and is formed in a container shape having an open back side. .
As shown in FIGS. 5 to 7, in the lid main body 51, the container-shaped bottom portion has a substantially rectangular shape when viewed from the back side, and is recessed in a concave shape toward the front side. Is formed.

As shown in FIGS. 5 to 7, the bottom portion 511 </ b> A of the first recess 511 has a substantially rectangular shape when viewed from the back side and is recessed in a concave shape toward the front side. Are formed side by side in the left-right direction.
The second recess 512 has a size corresponding to the outer shape of the fan housing 63 and is a portion in which the axial fan 6 is accommodated.
And the axial fan 6 is fixed to the bottom part of the 2nd recessed part 512 with the four fixing screws Sc (FIG. 5) in the state accommodated in the 2nd recessed part 512. FIG.

Further, as shown in FIGS. 5 to 7, the bottom portion 512 </ b> A of the second recess 512 is formed with an opening 513 having a circular shape when viewed from the back side, and from the peripheral portion of the opening 513 to the front surface. A cylindrical air introduction portion 514 protruding to the side and the back side is provided.
As described above, the bottom portion 512A of the second recess 512 corresponds to the suction side member according to the present invention. Hereinafter, for convenience of explanation, the bottom portion 512A of the second recess 512 is referred to as a suction side member 512A.
The center position of the circular shape in plan view at the opening 513 coincides with the rotational axis Ax in a state where the axial fan 6 is fixed to the suction side member 512A.
Further, as shown in FIG. 6 or FIG. 7, the end on the back side of the air introduction part 514 is connected to the suction port 63A in a state where the axial fan 6 is fixed to the suction side member 512A.
That is, the air on the front side of the replacement lid 5 (air in the vicinity of the light source device 31) is guided to the suction port 63 </ b> A of the axial fan 6 through the air introduction part 514 by driving the axial fan 6. Become.

  As shown in FIGS. 5 to 7, the front end of the air introduction part 514 has a curved slope 514A as an air rectification part, and the internal opening area increases toward the front side. It is formed to become. Then, the air introduced into the air introduction part 514 is rectified on the inclined surface 514A and guided toward the plurality of blades 61 through the suction port 63A.

Further, as shown in FIGS. 5 to 7, a first light shielding part 515 and a second light shielding part 516 are formed inside the air introduction part 514 so as to close a part of the inside.
As shown in FIGS. 5 to 7, the second light-shielding portion 516 has a circular shape whose center position matches the rotation axis Ax when viewed from the front side, and is formed so as to be recessed in the back side. . And the 2nd light shielding part 516 is arrange | positioned so that the impeller 62 may be covered in the state in which the axial fan 6 was being fixed to 512 A of suction side members.

As shown in FIG. 5 or 6, the first light shielding portion 515 is a plate whose plate surface is inclined with respect to the rotation axis Ax and extends along the radial direction from the center position (rotation axis Ax) in the air introduction portion 514. A plurality of body-shaped light shielding parts 515A and a plurality of outer light shielding parts 515B, and a connection part 515C for connecting the light shielding parts 515A and 515B are provided.
The connecting portion 515C has a circular frame shape, divides a region that is excluded by the second light shielding portion 516 into two regions inside the air introduction portion 514, and connects the light shielding portions 515A and 515B.
The plurality of center-side light-shielding portions 515A are arranged in the inner region of the two regions partitioned by the connection portion 515C, one end is connected to the outer edge of the second light-shielding portion 516, and the other end is connected to the connection portion 515C. To do.
In addition, the plurality of center-side light-shielding portions 515A are arranged for each first angle θ1 (FIG. 5) along the rotation direction about the rotation axis Ax.

The plurality of outer light-shielding portions 515B are arranged in the outer region of the two regions divided by the connection portion 515C, one end is connected to the connection portion 515C, and the other end is connected to the inner edge of the air introduction portion 514.
Further, the plurality of outer light-shielding portions 515B are provided for each second angle θ2 (FIG. 5) that is smaller than the first angle θ1 along the rotation direction about the rotation axis Ax.
In order to reduce the resistance to the air introduced into the air introduction part 514, the respective light shielding parts 515A and 515B described above are configured such that the cross-sectional areas of the front and back side end parts are smaller than the cross-sectional area of the central part. It is formed (FIG. 7).

Note that the inclination angles at which the plate surfaces of the light shielding portions 515A and 515B are inclined with respect to the rotation axis Ax are all set to be the same.
In the present embodiment, the inclination angle of each of the light shielding portions 515A and 515B can effectively reduce the air resistance according to the rotational speed of the impeller 62 in the axial fan 6, the twist angles of the plurality of blades 61, the arrangement pitch, and the like. The angle can be reduced.

Although not specifically shown, the discharge side member 52 has an outer shape substantially the same as that of the first recess 511 and is formed in a container shape having an open front side. The discharge side member 52 is fitted and fixed to the first recess 511 and constitutes a part of the back surface portion 24.
As shown in FIG. 4, FIG. 6 or FIG. 7, the discharge side member 52 is formed so that two exhaust ports 521 corresponding to the discharge ports 63 </ b> B of the two axial fans 6 are juxtaposed in the left-right direction. Has been.
Further, on the end surface on the front surface side of the discharge side member 52, a circular frame-shaped protrusion portion 522 that protrudes to the front surface side along the edge portion of each exhaust port 521 and is connected to each discharge port 63B is formed.
That is, by driving the axial fan 6, the air discharged from the discharge port 63 </ b> B is guided to the exhaust port 521 by the protruding portion 522 and is discharged to the outside of the exterior housing 2 through the exhaust port 521.
Further, a plurality of louvers 523 projecting rearward and extending in the left-right direction across the exhaust ports 521 are formed on the end face on the rear side of the discharge side member 52 so as to be juxtaposed in the vertical direction.

The first embodiment described above has the following effects.
In the present embodiment, the suction side member 512 </ b> A provided on the air suction side of the axial fan 6 is provided with an air introduction portion 514 having a slope 514 </ b> A. That is, the inclined surface 514 </ b> A is formed on the suction side member 512 </ b> A which is a separate member from the axial fan 6. Thus, even when the axial fan 6 is reduced in size and thickness, the suction side member 512A, which is a separate member from the axial fan 6, can reduce the resistance when air is sucked. That is, the air can be smoothly sucked in, the air in the vicinity of the light source device 31 can be efficiently sucked into the axial fan 6 to improve the cooling efficiency of the light source device 31 and the like. Noise associated with driving can be suppressed to ensure quietness.

The suction side member 512A is provided with a first light shielding portion 515. As a result, even when the structure in which the axial fan 6 is disposed in the vicinity of the exhaust port 521 as in the present embodiment is employed, the air introduction unit 514, the axial fan 6, and the exhaust port 521 are used. The light leaking outside the exterior housing 2 can be shielded by the first light shield 515.
Further, since the first light shielding portion 515 is formed so that the plate surface is inclined with respect to the rotation axis Ax, the air resistance is reduced while shielding the light described above, and the shaft is provided via the air introduction portion 514. The air can be favorably sucked into the flow fan 6.

In addition, the first light shield 515 includes a plurality of center-side light shields 515A arranged for each first angle θ1 and a plurality of outer light shields arranged for each second angle θ2 smaller than the first angle θ1. Part 515B. Accordingly, for example, the first light-shielding part 515 (a plurality of outer light-shielding parts 515B) is compared with the first light-shielding part 515 that is formed so as to extend radially from the rotation axis Ax side to the inner edge of the air introduction part 514. The light shielding area on the side separated from the rotation axis Ax (the outer region of the two regions partitioned by the connection portion 515C) is increased, and the above-described light can be sufficiently shielded.
In particular, in the present embodiment, since the axial fan 6 is provided in the vicinity of the light source device 31, the light described above is likely to leak to the outside of the exterior housing 2. Can be shielded from light.

Furthermore, air can be smoothly sucked into the axial fan 6 simply by forming the inclined surface 514A in the air introduction part 514, and the structure of the suction side member 512A can be simplified.
In addition, a second light shielding portion 516 is provided on the suction side member 512A. Thus, the light incident on the impeller 62 via the air introduction unit 514 can be blocked by the second light blocking unit 516. For this reason, the temperature rise of the impeller 62 due to the incidence of light on the impeller 62, and hence the temperature rise of the driver circuit (circuit board) disposed at the base end portion of the shaft portion 632C can be avoided, and the axial flow fan 6 can be avoided. Can be suppressed.
In particular, in the present embodiment, since the axial fan 6 is provided in the vicinity of the light source device 31, the above-described axial fan 6 is easily caused by the second light-shielding portion 516. Can be effectively suppressed.

  Further, the replacement lid 5 is integrally formed with a suction side member 512A, and an axial fan 6 is attached. As a result, the light source device 31 can be replaced with a new light source device 31 simply by removing the replacement lid 5 from the housing body 4, and the axial fan 6 can be replaced with a new axial fan 6. Can be easily maintained.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same member as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 8 is a cross-sectional view showing the configuration of the replacement lid 5 and the axial fan 6 in the second embodiment. Specifically, FIG. 8 corresponds to FIG.
In the first embodiment, the inclined surface 514A as the air rectifying unit is formed in the air introducing unit 514, and the air introduced into the air introducing unit 514 is rectified by the inclined surface 514A and guided toward the plurality of blades 61. .
On the other hand, in the second embodiment, the slope as the air rectifying unit is also formed in the second light shielding unit 516 in addition to the air introducing unit 514. Other configurations are the same as those in the first embodiment.

The second light-shielding portion 516 in the present embodiment has a circular shape when viewed from the front side as in the first embodiment, and has a slope 516A on the front side as shown in FIG. Accordingly, the cross-sectional area becomes smaller.
More specifically, the back side of the second light shielding part 516 has a cylindrical shape. The front surface side of the second light-shielding portion 516 has a conical shape whose apex coincides with the rotation axis Ax in a state where the axial fan 6 is fixed to the suction side member 512A.
Then, the air introduced into the air introduction part 514 is rectified on the slope 516A of the second light shielding part 516 and guided toward the plurality of blades 61 via the suction port 63A.

According to the second embodiment described above, there are the following effects in addition to the same effects as in the first embodiment.
In the present embodiment, the inclined surface 516 </ b> A as the air rectifying unit is also formed in the second light shielding unit 516. As a result, air separated from the rotation axis Ax can be smoothly sucked into the axial fan 6 by the inclined surface 514A formed in the air introduction portion 514, and the air in the vicinity of the rotation axis Ax is also axised by the inclined surface 516A. The flow fan 6 can be sucked smoothly. For this reason, the effect that the cooling efficiency of the light source device 31 and the like can be improved and the quietness can be secured can be more suitably achieved.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above-described embodiments, the suction side member 512A is formed integrally with the replacement lid 5, but the present invention is not limited to this, and the suction side member 512A may be configured separately from the replacement lid 5.
In each of the embodiments described above, the axial fan 6 is disposed in the vicinity of the exhaust port 521. However, the present invention is not limited to this, and the axial fan 6 may be disposed at any position inside the exterior housing 2. As described above, when the configuration in which the axial fan 6 is not disposed in the vicinity of the exhaust port 521 is adopted, the first light shielding unit 515 and the second light shielding unit 516 may be omitted.

In the respective embodiments, the shapes of the slopes 514A and 516A are not limited to the shapes described in the respective embodiments. That is, the inclined surfaces 514A and 516A may be formed in a flat shape instead of a curved shape.
In each of the embodiments, two axial fans 6 are provided. However, the number of axial fans 6 is not limited to two, and one or three or more may be provided.
In the second embodiment, the air introduction part 514 is provided with the slope 514A and the second light shielding part 516 is also provided with the slope 516A. However, the present invention is not limited to this, and the air introduction part 514 is not provided with the slope 514A. That is, a configuration in which the inclined surface 516A is provided only on the second light shielding portion 516 may be employed.

In each of the embodiments described above, the projector 1 includes the three liquid crystal panels 341, but the present invention is not limited to this. That is, the present invention can also be applied to a projector using two or less or four or more liquid crystal panels.
In each of the above embodiments, as the light modulation device, a reflective liquid crystal panel may be adopted in addition to a transmissive liquid crystal panel. Further, as long as it is a light modulation device that modulates a light beam according to image information to form an image, a light modulation device having another configuration may be adopted. For example, the present invention can be applied to a projector using a light modulation device other than liquid crystal, such as a device using a micromirror. When such a light modulation device is used, the polarizing plates 342 and 343 on the light beam incident side and the light beam emission side can be omitted.
In each of the above embodiments, only an example of a front projection type projector has been described. However, the present invention can also be applied to a rear type projector that includes a screen and performs projection from the back side of the screen.

  Even when the axial fan is downsized, the projector of the present invention can improve the cooling efficiency of the object to be cooled and ensure the quietness, so that it can be used as a projector used in presentations and home theaters.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing, 4 ... Housing main body, 5 ... Cover for replacement, 6 ... Axial fan, 31 ... Light source device, 61 ... Plural blades, 62 ... impeller, 63 ... fan housing, 512A ... bottom part (suction side member), 514 ... air introduction part, 514A, 516A ... slope (air rectification part) 515... First light shielding part 515A... Center side light shielding part 515B... Outer light shielding part 516. Angle, θ2... Second angle.

A projector according to the present invention is a projector that modulates a light beam emitted from a light source device according to image information to form an image, and projects the formed image, and includes a plurality of blades arranged around a predetermined rotation axis An axial fan that sucks and discharges air along the rotation shaft by rotating the plurality of blades around the rotation shaft, and a suction side member provided on the air suction side of the axial fan When, wherein the axial flow fan is an impeller that rotates about said plurality of vanes are integrated the rotary shaft to the outer periphery, the fan be rotatably supported to the impeller about said rotary shaft comprising a housing and, wherein the suction side member, a cylindrical air inlet section, the air the plurality of blades to be introduced through the air introduction part for introducing external air into the axial flow fan Sky rectifying towards A rectifier unit, a light shielding portion for closing a part of the internal in the air introduction part covers the impeller, characterized in that is provided.

In the projector according to the aspect of the invention, the axial fan includes an impeller in which the plurality of blades are integrated on an outer periphery and rotates around the rotation shaft, and the impeller is rotatably supported around the rotation shaft. comprising a fan casing, a, wherein the suction member, the optical unit shielding you close the part of the internal in the air introduction part covers the impeller that provided.

By the way, the axial fan has a driver circuit for rotating the impeller provided on the air discharge side with respect to the impeller.
In the present invention, the suction side member, the optical unit shielding is provided as described above. Thus, it can be shielded by the light unit shielding light incident to the impeller through the air inlet portion. For this reason, the temperature rise of the impeller due to the incidence of light on the impeller, and consequently the temperature rise of the driver circuit or the like can be avoided, and the malfunction of the axial fan can be suppressed.

In the projector according to the aspect of the invention, the suction side member may be formed in a plate shape having a plate surface inclined with respect to the rotation axis and extending in a radial direction from the rotation axis, another shielding portion is provided for closing a part of the other light shielding portion is positioned on the rotary shaft side, it is disposed in the first per angle along the rotation direction about the rotation axis A plurality of center-side light-shielding portions and a center-side light-shielding portion that is located on a side away from the rotation axis and is arranged at each second angle smaller than the first angle along the rotation direction. It is good also as providing a some outer side light-shielding part.

In the above configuration , the suction side member is provided with the other light shielding portion described above. As a result, even when a structure in which an axial fan is disposed in the vicinity of the exhaust port formed in the exterior casing is employed, the exterior casing exterior via the air introduction part, the axial fan, and the exhaust port. The light leaking into the light can be blocked by the other light blocking portion.
Further, since the other light shielding portion is formed so that the plate surface is inclined with respect to the rotation axis, the axial flow fan is provided via the air introduction portion while reducing the air resistance while shielding the light described above. Can inhale air well.
Further, the other light-shielding part is located on the rotation axis side and arranged on the side away from the rotation axis, with a plurality of center-side light-shielding parts arranged at first angles along the rotation direction around the rotation axis. A plurality of outer light-shielding portions that are positioned and arranged at every second angle smaller than the first angle. Thus, for example, in comparison with the configuration formed so as to extend radially from the rotation shaft side to the inner edge of the air introducing portion as the other light shielding portion, from the axis of rotation by the other light shielding portion (a plurality of outer shielding portion) The light shielding area on the separated side can be increased to sufficiently shield the above-described light.

In the projector according to the aspect of the invention, the air rectification unit may be a slope formed in the air introduction unit, and the slope may be formed so that an internal opening area increases as the distance from the axial flow fan increases. It is preferable.
In the present invention, the air rectification unit is a slope formed in the air introduction unit. For this reason, an air rectification part can be formed only by forming a slope so that an internal opening area may become large as it leaves | separates from an axial fan, and simplification of the structure of a suction side member can be achieved.

In the projector of the present invention, the air guide portion is preferably formed before Kisaegi light portion in a conical shape in which the cross-sectional area decreases as the distance from the axial flow fan.
In the present invention, the air rectifying unit is formed on the light unit shielding conically so that the cross-sectional area decreases as the distance from the axial fan as described above. Thus, for example, air guide portion to the air introducing portion as described above (hereinafter referred to as a first air guide section) to form the air rectifying unit to an optical unit shielding the further (hereinafter, second air guide The air separated from the rotating shaft can be smoothly sucked into the axial flow fan by the first air rectifying unit, and the air near the rotating shaft is also shafted by the second air rectifying unit. The flow fan can be inhaled smoothly. For this reason, the effect that the cooling efficiency of the cooling object described above can be improved and quietness can be ensured can be further suitably achieved.

In the projector according to the aspect of the invention, an exterior casing that constitutes an exterior is provided, and the exterior casing includes a casing main body having a replacement opening that allows the light source device to be attached to and detached from the inside and outside of the exterior casing, and the casing A replacement lid that is detachably attached to the main body and closes the replacement opening, and the suction lid member is formed integrally with the replacement lid, An axial fan is preferably attached.

Claims (6)

A projector that modulates a light beam emitted from a light source device according to image information to form an image, and projects the formed image,
An axial fan that has a plurality of blades arranged around a predetermined rotation axis, and that sucks and discharges air along the rotation axis by rotating the plurality of blades around the rotation axis;
A suction side member provided on the air suction side of the axial fan,
In the suction side member,
A cylindrical air introduction part for introducing external air into the axial fan;
An air rectifying unit that rectifies air introduced through the air introducing unit toward the plurality of blades. The projector according to claim 1.
In the suction side member,
A plate surface is inclined with respect to the rotation axis, is formed in a plate shape extending along a radial direction from the rotation axis, and a first light-shielding portion that closes a part of the inside of the air introduction portion is provided,
The first light shielding portion is
A plurality of center-side light-shielding portions that are located on the rotation axis side and are arranged at first angles along a rotation direction around the rotation axis;
A plurality of outer light-shielding portions that are located on a side away from the rotation shaft with respect to the center-side light-shielding portion and are arranged at second angles smaller than the first angle along the rotation direction. A projector characterized by that. The projector according to claim 1 or 2,
The air rectifier is
A slope formed in the air introduction part,
The projector is characterized in that the inclined surface is formed so that an inner opening area increases as the distance from the axial flow fan increases. The projector according to any one of claims 1 to 3,
The axial fan is
An impeller that has the plurality of blades integrated on an outer periphery and rotates about the rotation shaft; and a fan housing that rotatably supports the impeller about the rotation shaft,
In the suction side member,
The projector characterized by the above-mentioned. The 2nd light-shielding part which covers the said impeller and obstruct | occludes a part of inside in the said air introduction part is provided. The projector according to claim 4,
The air rectifier is
The projector is characterized in that the second light-shielding portion is formed in a conical shape with a cross-sectional area that decreases as the distance from the axial flow fan increases. The projector according to any one of claims 1 to 5,
Provided with an exterior casing constituting the exterior,
The outer casing is
A housing body having a replacement opening that allows the light source device to be attached to and detached from the exterior housing;
A replacement lid that is detachably attached to the housing body and closes the replacement opening;
The replacement lid includes
The projector, wherein the suction side member is integrally formed, and the axial fan is attached.

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