JP2015018150A - Projector and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that has suppressed a variation in the lives (durability) of a plurality of fans.SOLUTION: A projector 100 includes an exhaust unit 60 having an exhaust port 63 that is formed in a housing 99, a hollow air guide body 64 that is arranged annularly to surround the outer edge part of the exhaust port 63, an exhaust induction fan 61 that takes in the outside air, and a flow channel 62 that introduces the air taken in by the exhaust induction fan 61 into the inside of the air guide body 64, where the air guide body 64 has an annular, slit-like discharge port 67 formed therein to blow out the air annularly to the outside of the housing. Since a jet flow in a form of a conically expanded ring is formed from the discharge port 67, the pressure inside the jet flow becomes negative, and thereby the air inside the housing is sucked into the exhaust port 63 and discharged therefrom.

Description

  The present invention relates to a projector and an electronic apparatus.

A projector is an optical device that modulates a light beam from a light source using a light modulator such as a liquid crystal light valve, and projects the modulated image light onto a screen or the like. It is used for various purposes such as viewing.
When the projector is activated, the light source unit emits light by converting electrical energy into light energy. Even if a lamp with high energy conversion efficiency is used, the efficiency is on the order of several tens of percent. It became energy and became a heat generation factor of the light source part. Also, in the light modulation unit, a loss of light energy occurs when modulating the incident light beam, which becomes thermal energy, which is a heat generation factor of the light modulation unit. For example, in a light modulation unit using a liquid crystal panel, light modulated in black display (light in a low gradation range) is absorbed by the exit polarizing plate, which causes heat generation. The temperature rise due to these heat generations deteriorates the performance and function of each component.

  FIG. 15 is a plan view showing a schematic configuration of a conventional projector. In order to suppress the temperature rise of these internal components, the conventional projector 200 includes the fan 1 and the fan 2 that take in external air to cool the internal components, and the heated air inside the housing to the outside of the housing. The fan 3 which discharges | emits was provided (for example, patent document 1).

JP 2008-286824 A

  However, in such a conventional projector, the temperature of the fan 3 (exhaust fan) that discharges the heated air in the housing is higher than that of the fan 1 and the fan 2 (intake fan) that take in external air. As a result, metal wear of the fan bearing (ball bearing) and deterioration of the lubrication system (oil evaporation, alteration, etc.) are accelerated, and the life of the fan 3 is shortened. This is because the air (exhaust gas) that has absorbed the heat of the light source unit or the like and has become hotter than the external air directly hits the fan 3. In other words, there is a problem that variations in the life (durability) of a plurality of fans used in the projector occur. In other words, the lifetime of the projector body is dependent on the lifetime of the exhaust fan (fan 3).

  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 forms or application examples.

  (Application Example) A projector according to this application example includes a light source, a light modulation unit that generates modulated light obtained by modulating light emitted from the light source according to an image signal, a housing that stores at least the light source and the light modulation unit. An exhaust port formed in the housing, an air guide body installed so as to surround the outer edge of the exhaust port, an exhaust induction fan that takes in external air, and an exhaust induction fan And an exhaust section having a flow path for flowing the air taken in through the air guide body, and the air guide body is characterized in that a discharge port is formed through which air is blown out to the outside of the casing.

According to this application example, the external air taken in by the exhaust induction fan is discharged from the discharge port, thereby generating a negative pressure at the center of the exhaust port, so that the heated air in the housing is attracted to the exhaust port side. Finally, a flow is established for discharging to the outside of the housing through the exhaust port.
Therefore, an equivalent exhaust function can be realized even with a configuration that uses a fan that always takes in external air instead of the exhaust fan that is directly exposed to the heated air in the housing. In other words, the durability of the exhaust fan can be made equivalent to that of the intake fan.
Therefore, it is possible to provide a projector that suppresses variations in the life (durability) of a plurality of fans.

  Moreover, it is preferable that an air inlet is further formed in the housing.

  The intake port is preferably provided with a fan that takes external air into the housing.

  Moreover, it is preferable that the air blown out from the discharge port forms a jet in which the ring expands in a conical shape.

  In addition, when the exhaust part is the first exhaust part, the exhaust part further includes a second exhaust part disposed inside the housing and on the windward side of the first exhaust part, and the second exhaust part has an exhaust port An annular second air guide body disposed on the windward side of the air, a second exhaust induction fan that takes in external air, and a flow path that causes the air taken in by the second exhaust induction fan to flow to the second air guide body The second air guide body is preferably provided with a discharge port for blowing air in an annular shape toward the exhaust port.

  A projector comprising: a light source; a light modulation unit that generates modulated light obtained by modulating light emitted from the light source according to an image signal; and a housing that houses at least the light source and the light modulation unit. Air intake fan that takes in air, an exhaust port formed in the housing, an air guide installed so as to surround the outer edge of the exhaust port, and air taken in by the intake fan cools the light source or the light modulation unit And a flow path that guides the exhausted air to the air guide body, and the air guide body is formed with a discharge port for blowing air out of the casing in an annular shape.

  Further, a shutter is preferably provided at the exhaust port.

  Moreover, it is preferable that the exhaust port is provided with a louver.

  A housing, an exhaust port formed in the housing, an air guide installed so as to surround an outer edge of the exhaust port, an exhaust induction fan that takes in external air, and an air that is taken in by the exhaust induction fan An electronic apparatus comprising: an exhaust portion having a flow path for flowing through the air guide body; and a discharge port through which air is blown out annularly to the outside of the housing.

FIG. 2 is a perspective view showing the projector according to the first embodiment. The top view which shows the structure of a projector. The perspective view of a wind guide (exhaust port). The enlarged plan view of an exhaust part. FIG. 6 is a plan view of a projector according to a second embodiment. FIG. 6 is a plan view of a projector according to a third embodiment. FIG. 6 is a plan view of a projector according to a fourth embodiment. FIG. 10 is a plan view of a projector according to a fifth embodiment. FIG. 10 is a plan view of a projector according to a sixth embodiment. FIG. 10 is a plan view of a projector according to a seventh embodiment. The perspective view of the air guide body (exhaust port) which concerns on the modification 1. FIG. The perspective view of the air guide body (exhaust port) which concerns on the modification 2. FIG. Sectional drawing of the exhaust port periphery which concerns on the modification 3. FIG. Sectional drawing of the exhaust port periphery which concerns on the modification 4. FIG. The top view of the conventional projector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each layer and each member is made different from the actual scale so that each layer and each member can be recognized.

(Embodiment 1)
≪Projector Outline≫
FIG. 1 is a perspective view of the projector according to the first embodiment.
Here, a schematic configuration of the projector 100 will be described with reference to FIG.

The projector 100 is an image projection apparatus that uses a high-pressure mercury lamp or the like as a light source, modulates light emitted from the light source according to an image signal by a light modulation element, and enlarges and projects modulated light representing the modulated image from the projection lens 50. is there.
The projector 100 is provided with the exhaust unit 60 having a configuration different from that of the exhaust fan of the conventional projector (see FIG. 15), thereby improving durability without reducing the exhaust capability. Specifically, by utilizing the phenomenon that the jet draws the surrounding fluid, the heated air in the housing 99 is discharged so that the fan used in the exhaust unit 60 is not exposed to hot air. A specific configuration of the exhaust unit 60 will be described later.

The projector 100 has a flat, substantially rectangular housing 99. In the following description, the surface on which the projection lens 50 is disposed is referred to as a front surface 91, the surface opposite to the front surface 91 is referred to as a back surface 93, and the side surfaces adjacent to the front surface 91 and the back surface 93 are referred to as side surfaces 92 and 94. Further, a surface on which the operation unit 89 including a plurality of operation buttons including the power button of the projector 100 is arranged is referred to as an upper surface 95, and a surface opposite to the upper surface 95 is referred to as a bottom surface 96.
Further, the front surface 91 has a rectangular shape, and the extending direction of the long side is the X axis, and the extending direction of the short side is the Z axis. The direction from the front face 91 toward the rear face 93 is taken as the Y axis. That is, in the housing 99, the X axis corresponds to the width direction, the Y axis corresponds to the depth direction, and the Z axis corresponds to the height direction.

FIG. 2 is a plan sectional view of the projector 100. In detail, it is the figure (plan view) which observed the housing | casing 99 from the upper surface side, and permeate | transmits and shows the internal structure.
The housing 99 is formed with intake ports 45, 46, 65 and an exhaust port 63. Specifically, an air inlet 65 is formed on the X axis (−) side of the projection lens 50 on the front face 91. The projection lens 50 and the intake port 65 are disposed at substantially symmetrical positions on both ends in the long side direction of the front face 91. An intake port 45 is formed in the vicinity of the light source unit 10 on the back surface 93. The air inlet 45 is disposed at a position on the X axis (−) side of the back surface 93. On the side surface 94, an air inlet 46 is formed in the vicinity of the relay optical unit 25. The intake port 46 is disposed at a position on the side surface 94 on the Y-axis (+) side. An exhaust port 63 is formed in the side surface 92. The exhaust port 63 is disposed at a position on the side surface 92 on the Y-axis (−) side.

The housing 99 houses the light source unit 10, the optical unit 40, the projection lens 50, the intake fans 1 and 2 (cooling unit), the exhaust unit 60, and the like.
The light source unit 10 includes a light source 11 such as a high-pressure mercury lamp, and a reflector 12 that collects light emitted from the light source 11 and emits the light to the optical unit 40 side. The reflector 12 employs a parabolic mirror in which the cross section in the extending direction of the light beam emitted from the light source unit 10 to the polarization conversion unit 15 is a paraboloid. The light emitted from the light source 11 spreads radially, but is collected by the reflector 12 and emitted as a substantially parallel light beam to the polarization conversion unit 15. The light source unit 10 is disposed at a position facing the air inlet 45 in the vicinity of the corner where the back surface 93 and the side surface 92 intersect.
The light source 11 is not limited to a high-pressure mercury lamp, and may be a solid light source such as a laser or LED (light emitting diode) in addition to a discharge lamp such as a metal halide lamp. The reflector 12 is not limited to a parabolic mirror, and may have a configuration in which a collimating concave lens is disposed on the exit surface of a reflector made of an ellipsoidal mirror.
In addition, although the light source unit 10 includes the light source 11 having excellent power / light conversion efficiency, the conversion efficiency is on the order of several tens of percent. It is a very hot part.

The optical unit 40 includes a polarization conversion unit 15, a color separation optical unit 20, a relay optical unit 25, a light modulation unit 30, and the like.
The polarization conversion unit 15 includes a first lens array 16a, a second lens array 16b, a polarization conversion element 17, and a superimposing lens 18.
The first lens array 16a and the second lens array 16b have a configuration in which small lenses having a substantially rectangular outline when viewed from the direction of the light source unit 10 are arranged in a matrix, and are paired in two. Each pair of small lenses divides the light beam emitted from the light source unit 10 into partial light beams and emits them in the optical axis direction. A plurality of light source images emitted from the respective small lenses are formed on the surfaces of the liquid crystal light valves 32R, 32G, and 32B for the respective color lights through the superimposing lens 18. Thereby, the luminance distribution on the surfaces of the liquid crystal light valves 32R, 32G, and 32B is made uniform.

The polarization conversion element 17 converts random polarized light into specific linearly polarized light (S-polarized wave). Since the specific linearly polarized light is polarized light that can be incident on a polarizing plate (not shown) provided on the incident surface of each liquid crystal light valve, if there is no polarization conversion element 17, it cannot be transmitted through the polarizing plate as heat. Light that has been wasted can be used effectively.
The light emitted from the light source unit 10 is emitted to the color separation optical unit 20 side (X axis (+) side) via the polarization conversion unit 15.

The color separation optical unit 20 includes a dichroic mirror 21a, a dichroic mirror 21b, and a reflection mirror 22.
The dichroic mirror 21a is an optical element in which a dichroic film having a property of reflecting red light and transmitting green light and blue light is formed on a glass plate or the like. The dichroic mirror 21a reflects red light toward the reflection mirror 22 to Transmits blue light. The red light reflected by the reflection mirror 22 is collimated by the collimating lens 31R and enters the liquid crystal light valve 32R. The green light and the blue light transmitted through the dichroic mirror 21a enter the dichroic mirror 21b.
The dichroic mirror 21b is an optical element formed with a dichroic film that reflects green light and transmits blue light. The dichroic mirror 21b reflects green light to the liquid crystal light valve 32G side (Y-axis (−) side) and emits blue light. Transparent. The green light reflected by the dichroic mirror 21b is collimated by the collimating lens 31G and enters the liquid crystal light valve 32G. The blue light transmitted through the dichroic mirror 21 b enters the relay optical unit 25.

The relay optical unit 25 includes a relay lens 26a, a relay lens 26b, a reflection mirror 27a, and a reflection mirror 27b.
The blue light transmitted through the dichroic mirror 21b is reflected by the reflecting mirror 27a through the relay lens 26a, further reflected by the reflecting mirror 27b through the relay lens 26b, and then collimated by the collimating lens 31B to be liquid crystal light. The light enters the valve 32B. The two relay lenses 26a and 26b are provided to prevent attenuation of blue light passing through the longest optical path among the separated three-color lights.

The light modulation unit 30 includes liquid crystal light valves 32R, 32G, and 32B for each color light, a cross dichroic prism 33, and the like.
The liquid crystal light valves 32R, 32G, and 32B are provided to face three surfaces of the cross dichroic prism 33 having a substantially cubic shape. An incident polarizing plate is provided on the light incident surface of each liquid crystal light valve, and an outgoing polarizing plate (none of which is shown) is provided on the light emitting surface facing the cross dichroic prism 33. The outgoing polarizing plate may be configured to be attached in advance to each surface of the cross dichroic prism 33.
Part of the light that irradiates the incident polarizing plate and the outgoing polarizing plate cannot be transmitted and is consumed as heat. In other words, the incident polarizing plate and the outgoing polarizing plate are also heat generating parts. In particular, the exit polarizing plate absorbs light that has been modulated into black display, and thus generates a larger amount of heat than the incident polarizing plate. Similarly, since the liquid crystal light valves 32R, 32G, and 32B also generate heat, the light modulation unit 30 including the cross dichroic prism 33 that is in close contact with the output polarizing plate has a main heat generation part in the projector 100. Become.
The liquid crystal light valves 32R, 32G, and 32B are active matrix type liquid crystal display elements including a plurality of pixels corresponding to the resolution.
Each color light incident on the liquid crystal light valves 32R, 32G, and 32B is modulated into each color modulated light including an optical image for each color light, and is emitted into the cross dichroic prism 33, respectively.

  The cross dichroic prism 33 transmits the green modulated light from the liquid crystal light valve 32G, the red modulated light from the liquid crystal light valve 32R, and the blue modulated light from the liquid crystal light valve 32B to the green modulated light. Is emitted to the projection lens 50 side (Y-axis (−) side).

  The projection lens 50 is a wide-angle zoom lens in which a plurality of lenses such as a Gaussian type are combined in a cylindrical lens barrel. The combined light emitted from the cross dichroic prism 33 is enlarged and projected on a screen or the like as a full-color image by the projection lens 50.

The intake fans 1 and 2 are cooling units (mechanisms), and intake fans 1 and 2 that take in external air are provided for each heat generating portion. The heat generating parts are the light source unit 10 and the light modulation unit 30 as described above.
The intake fan 1 is a sirocco fan provided at the intake port 45, sucks external air from the intake port 45, and blows air to the light source unit 10 through the flow path 1 a. The flow path 1 a is a flow path for flowing air from the air blowing port 14 on the side surface of the intake fan 1 toward the reflector 12 of the light source unit 10. The air blown into the light source unit 10 directly absorbs (cools) heat from the light source 11 that is a heat source and the reflector 12 heated by the light source 11, and is provided on the front 91 side of the outer edge of the light source unit 10. It is discharged to the path 1b. The flow path 1b is a flow path for flowing heated air from the outer edge of the light source unit 10 toward the exhaust port 63 side.

The intake fan 2 is a sirocco fan provided at the intake port 46, sucks external air from the intake port 46, and blows air to the light modulation unit 30 through the flow path 2 a. The flow path 2 a is a flow path for flowing air from the air blowing port 24 of the intake fan 2 toward the light modulation unit 30. The air blown to the light modulation unit 30 flows along the three surrounding surfaces of the cross dichroic prism 33. That is, the liquid crystal light valves for three color lights arranged on the three surfaces around the cross dichroic prism 33 and the incident polarizing plate and the outgoing polarizing plate provided in each liquid crystal light valve are cooled in order. The air that has absorbed heat from the heat source in the light modulation unit 30 passes through the light modulation unit 30 and is discharged to the flow path 2b. The flow path 2b is a flow path for flowing heated air from the outer edge of the light modulation section 30 toward the exhaust port 63 side.
In order to prevent dust from entering the housing 99 when the outside air is sucked from the air inlets 45 and 46, dustproof filters (not shown) are respectively provided inside the air inlets 45 and 46. Is provided. Further, the intake fans 1 and 2 may be axial fans. You may provide the duct which divides each flow path in the flow path 1a and the flow paths 1b and 2b.

  The exhaust unit 60 includes an intake port 65, an exhaust induction fan 61, a flow path 62, an exhaust port 63, an air guide body 64, and the like, and is disposed in the vicinity of a corner where the front surface 91 and the side surface 92 intersect. Yes. Hereinafter, the configuration of the exhaust unit 60 will be described in detail.

<Exhaust configuration>
FIG. 3 is a perspective view showing a schematic configuration of the exhaust port. FIG. 4 is an enlarged plan view of the exhaust part. Here, the configuration of the exhaust unit and the exhaust principle will be described with reference to FIGS. In addition, the block arrow with a solid in FIG. 4 shows the flow of the exhaust induction wind, the solid line arrow shows the flow (jet flow) in the discharge port and the discharged air, and the dotted line arrow shows the discharged jet flow. The movement of the air in the exhaust port 63 attracted to is shown.
The exhaust induction fan 61 is a sirocco fan provided at the intake port 65.
The flow path 62 is a flow path for flowing air in a crank shape from the air blowing port 66 of the exhaust induction fan 61 toward the air guide body 64.

The air guide body 64 is a ring-shaped part surrounding the outer edge portion of the exhaust port 63 and is formed in a hollow shape. The cross-sectional shape of the air guide body 64 is a wing shape of an aircraft, and is arranged such that the traveling direction of the wing faces the inside of the housing 99. The wings are arranged so that the inner side (X axis (+) side) of the housing 99 is narrow and the outer side (X axis (−) side) is wide. In other words, the openings (concentric circles) are arranged in a tapered shape from the inside to the outside.
And as shown in FIG. 3, the slit-shaped discharge port 67 is formed in the middle in the inner surface of the said wing | blade. The discharge port 67 is formed in a ring shape on the inner peripheral edge of the air guide body 64.
When the exhaust induction fan 61 is operated, the external air taken in from the intake port 65 is blown to the air guide body 64 through the flow path 62. The air blown through the flow path 62 fills the cavity of the air guide body 64, and then is discharged from the slit-shaped discharge port 67 toward the outside of the housing 99. The discharged air forms a ring-shaped continuous flow (jet flow) along the inner wall surface of the exhaust port 63. The taper of the blade (inner peripheral edge of the air guide body 64) is set so that the diameter of the ring-shaped jet increases (spreads in a conical shape) as the air jet body 64 moves away from the air guide body 64. The jet is not limited to the one that expands in a conical shape, and may be blown out in a cylindrical shape.

  By this jet flow, the air on the center side of the exhaust port 63 is attracted to the jet flow on the outer edge side. This utilizes the property that the jet draws the surrounding fluid. Therefore, the atmospheric pressure at the center of the exhaust port 63 is reduced (negative pressure is generated). Therefore, the air pressure in the exhaust port 63 becomes lower than the air pressure in the housing 99, and the heated air in the housing 99, that is, the air that has been absorbed by the light source unit 10 and the light modulation unit 30 is heated. It is drawn to the exhaust port 63 side through the flow paths 1b and 2b. The drawn air is finally discharged to the outside of the housing 99 through the exhaust port 63. That is, the flow of air taken in from the intake port 65 and discharged from the discharge port 67 becomes an exhaust induction wind that discharges the heated air in the housing 99.

  In addition, the width | variety of the slit of the discharge outlet 67 is set to 1.5 mm as a suitable example. However, the width of the slit is not limited to 1.5 mm, and the range may be 0.5 mm or more and 5 mm or less. If a straight line passing through the center of the exhaust port 63 and extending perpendicularly to the side surface 92 is defined as a center line 69, the angle θ formed by the center line 69 and the inner wall surface of the exhaust port 63 is set to 15 ° as a preferred example. doing. However, the angle θ is not limited to 15 °, and the range may be greater than 0 ° and 45 ° or less. The slit width and the angle θ of the discharge port 67 are preferably optimized for each projector type (specification) in consideration of the size of the exhaust port 63, the capability of the exhaust induction fan 61, and the like. A dust filter may be provided on the inner side of the intake port 65 in order to prevent dust from entering the exhaust part 60 when external air is sucked from the intake port 65.

As described above, according to the projector 100 according to the present embodiment, the following effects can be obtained.
The projector 100 includes an exhaust unit 60 that includes an intake port 65, an exhaust induction fan 61, an exhaust port 63, an air guide body 64, and the like. By operating the exhaust induction fan 61, external air taken in from the intake port 65 is blown to the air guide body 64 through the flow path 62. The air guide body 64 forms a ring-shaped cavity, and further includes a slit-shaped discharge port 67 arranged in a ring shape over the entire circumference. The air blown through the flow path 62 fills the cavity of the air guide body 64, and then is discharged from the slit-shaped discharge port 67 toward the outside of the housing 99. The discharged air forms a ring-shaped continuous flow (jet flow) along the inner wall surface of the exhaust port 63. The jet forms an air flow whose diameter increases (spreads in a conical shape) as the distance from the air guide body 64 increases. By this jet flow, the air on the center side of the exhaust port 63 is attracted to the jet flow, and the air pressure at the center portion decreases. Therefore, the heated air in the housing 99 is drawn toward the exhaust port 63 through the respective flow paths. The drawn air is finally discharged to the outside of the housing 99 through the exhaust port 63. That is, the flow of air taken in from the intake port 65 and discharged from the discharge port 67 becomes an exhaust induction wind that discharges the heated air in the housing 99.

Therefore, according to the projector 100, since the exhaust unit 60 is provided, the projector 100 has an exhaust function equivalent to that of the conventional projector (FIG. 15). Furthermore, since the exhaust induction fan 61 in the exhaust unit 60 is disposed at a position where the heated air in the housing 99 does not hit, it is not exposed to the heated air. In other words, in the configuration of the exhaust unit 60, the exhaust induction fan 61 takes in only external air whose temperature is lower than that of the air in the housing 99, similarly to the intake fans 1 and 2.
Therefore, the projector 100 can make the life (durability) of the fan in the exhaust section equivalent to that of the intake fan.
Therefore, it is possible to provide a projector that suppresses the life variation of the plurality of fans.

(Embodiment 2)
FIG. 5 is a plan view of the projector according to the second embodiment, and corresponds to FIG. Hereinafter, the projector 110 according to the present embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

  The projector 110 is provided with an exhaust section having a two-stage configuration, thereby improving the exhaust capacity. Specifically, in addition to the configuration of the projector 100 according to the first embodiment, the housing 99 further includes a (second) exhaust unit 70 for promoting exhaust. The exhaust unit 70 is disposed between the projection lens 50 and the exhaust unit 60. In other words, the exhaust part 70 is arranged in tandem (vertical column) on the upper stage (windward side) of the exhaust part 60 having the exhaust port 63. The projector 110 is the same as the projector 100 of the first embodiment except for the configuration related to the exhaust unit 70.

The exhaust unit 70 includes an intake port 75, an exhaust induction fan 71, a flow path 72, an air guide body 74, and the like. Hereinafter, the configuration of the exhaust unit 70 will be described in detail.
The air inlet 75 is formed between the air inlet 65 and the projection lens 50 on the front face 91 of the housing 99. The exhaust induction fan 71 is a sirocco fan provided at the intake port 75.
The flow path 72 is a flow path for flowing external air in a crank shape from the air blowing port 76 of the exhaust induction fan 71 toward the air guide body 74.
The air guide body 74 is a hollow ring-shaped member similar to the air guide body 64, but is different from the air guide body 64 in that it is used as a single product. Specifically, although the air guide body 64 is embedded in the side surface 92, the air guide body 74 is fixed with the ring-shaped outer edge thereof being exposed. In other words, the outer edge of the air guide body 64 is the side surface 92, but the outer edge of the air guide body 74 is a space. For convenience of explanation, the inner side (inner peripheral side) of the ring-shaped air guide body 74 is an exhaust port 73. In addition, the configuration is not limited to a configuration in which the single air guide body 74 is fixed in an upright state. May be.

  Since the exhaust unit 70 has the same configuration as the exhaust unit 60 as described above, the function of sucking the air in front of the air guide body 74 (X axis (+) side) and discharging it to the rear (exhaust port 63 side). have.

As described above, according to the projector 110 according to the present embodiment, in addition to the effects in the first embodiment, the following effects can be obtained.
Since the second exhaust unit 70 is disposed along the flow path 2b through which the exhaust from the light modulation unit 30 flows, the second exhaust unit 70 can be sent to the exhaust port 63 side with momentum. In other words, by providing the exhaust unit 70 on the windward side of the exhaust unit 60, the exhaust from the light modulation unit 30 can be sent out to the exhaust port 63 side more smoothly.
Therefore, it is possible to provide the projector 110 with higher exhaust efficiency.

(Embodiment 3)
FIG. 6 is a plan view of the projector according to the third embodiment, and corresponds to FIG. Hereinafter, the projector 120 according to this embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

The projector 120 realizes the exhaust of the heated air in the housing 99 without providing the intake port 65 and the exhaust induction fan 61 in FIG. Specifically, in the configuration of the exhaust unit 60 of the first embodiment, the intake port 65 and the exhaust induction fan 61 are omitted.
On the other hand, a duct 77 that partitions the exhaust flow path 2b from the light modulation section 30 is provided. Specifically, a pipe-shaped duct 77 that directly passes from the outer edge of the light modulation unit 30 to the air guide body 64 is provided. In other words, the airflow sent from the intake fan 2 is also used as the exhaust induction wind without providing (not using) the exhaust induction fan dedicated to the air guide body 64.

  Even in this configuration, a ring-shaped jet that expands conically in the X-axis (−) direction is formed from the discharge port 67, so that air inside the housing 99 is sucked into the exhaust port 63. Become. In other words, even when heated exhaust gas is used, it can function as an exhaust induction wind ejected from the discharge port 67.

As described above, according to the projector 120 according to the present embodiment, in addition to the effects in the first embodiment, the following effects can be obtained.
Even in the configuration of the exhaust unit 60 of the first embodiment, in which the intake port 65 and the exhaust induction fan 61 are omitted, the exhaust capability equivalent to that of the first embodiment can be provided.
Accordingly, it is possible to provide the projector 120 that has a small number of parts constituting the projector and further suppresses power consumption related to exhaust.

(Embodiment 4)
FIG. 7 is a plan view of the projector according to the fourth embodiment, and corresponds to FIG. Hereinafter, the projector 130 according to this embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 2, the same number is used and the overlapping description is abbreviate | omitted.

In the projector 130, exhaust of the heated air in the housing 99 is realized without providing the intake port 75 and the exhaust induction fan 71 in the second exhaust unit 70 of FIG. Specifically, in the configuration of the second exhaust unit 70, the intake port 75 and the exhaust induction fan 71 are omitted.
On the other hand, a duct 78 that divides the flow path 2 b of the exhaust gas from the light modulation unit 30 is provided. Specifically, a pipe-shaped duct 78 that directly passes from the outer edge of the light modulation unit 30 to the air guide body 74 is provided. In other words, the airflow sent from the intake fan 2 is used as the exhaust induction wind without providing (not using) the exhaust induction fan dedicated to the air guide body 74.

  Even in this configuration, a jet flow in which the ring expands in a conical shape in the X-axis (−) direction is formed from the discharge port of the wind guide body 74, so the front side of the wind guide body 74 (X-axis (+) side). Air is sucked into the exhaust port 73. In other words, even when heated exhaust is used, it can function as an exhaust induction wind that is ejected from the discharge port.

As described above, according to the projector 130 according to the present embodiment, in addition to the effects of the second embodiment, the following effects can be obtained.
Even in the configuration of the exhaust unit 70 of the second embodiment in which the intake port 75 and the exhaust induction fan 71 are omitted, the same exhaust capability as that of the second embodiment can be ensured.
Accordingly, it is possible to provide the projector 130 that has a small number of parts constituting the projector and further suppresses power consumption related to exhaust.

(Embodiment 5)
FIG. 8 is a plan view of the projector according to the fifth embodiment, and corresponds to FIG. Hereinafter, the projector 140 according to the present embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

  The projector 140 uses the heated air flow path to improve the exhaust capability without adding an exhaust induction fan. Specifically, the air guide body 64 is provided with a duct 79 (flow path 1 b) for introducing exhaust from the light source unit 10 in addition to the flow path 62 for introducing external air from the exhaust induction fan 61. In other words, in addition to the external air, exhaust from the light source unit 10 also enters the air guide body 64, so that the internal atmospheric pressure increases, and the momentum of the exhaust induction wind ejected from the discharge port is increased.

As described above, according to the projector 140 according to the present embodiment, in addition to the effects in the first embodiment, the following effects can be obtained.
By using the exhaust from the light source unit 10 in addition to the external air introduced from the exhaust induction fan 61, the momentum of the exhaust induction wind is increased, so that the power to suck out the exhaust in the housing 99 is increased, and the exhaust capability Can be further enhanced.
Therefore, it is possible to provide the projector 140 that can efficiently exhaust the heated air in the housing 99.

(Embodiment 6)
FIG. 9 is a plan view of the projector according to the sixth embodiment, and corresponds to FIG. Hereinafter, the projector 150 according to this embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

  The projector 150 realizes cooling of the main heat generating parts in the housing 99, that is, the light source unit 10 and the light modulation unit 30, without providing the intake fans 1 and 2 in FIG. Specifically, the projector 150 has a configuration in which the intake fans 1 and 2 are omitted from the configuration of the first embodiment. In other words, only the openings of the intake port 45 and the intake port 46 are configured. Even in this configuration, since the air pressure in the housing 99 decreases as the exhaust air 60 sucks (exhausts) the heated air in the housing 99, the air from the intake ports 45 and 46 is naturally removed from the outside. Air is taken in and cooled.

As described above, according to the projector 150 according to the present embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
Even in the configuration in which the intake fans 1 and 2 are omitted, the light source unit 10 and the light modulation unit 30 can be cooled.
Therefore, it is possible to provide the projector 150 that has a small number of parts constituting the projector and further suppresses power consumption related to intake air.

(Embodiment 7)
FIG. 10 is a plan view of the projector according to the seventh embodiment, and corresponds to FIG. Hereinafter, the projector 160 according to this embodiment will be described with reference to FIG. In addition, about the component same as Embodiment 1, the same number is used and the overlapping description is abbreviate | omitted.

In each of the above embodiments, the projector has been described as a so-called “liquid crystal three-plate projector” including three liquid crystal light valves for red light, blue light, and green light as light modulation elements. The projector is not limited to the above, and any projector provided with a light source and a light modulation element may be used. In other words, the exhaust unit described above can be applied to a projector having a heat generating unit.
The projector 160 includes a light source 11, a color wheel 81 that sequentially colors light emitted from the light source into three colors of red, green, and blue, a micromirror display element 86 having a display area in which a plurality of pixels are arranged in a matrix, and the like. Is an image projection apparatus configured to include The projector 160 has a flat, substantially rectangular housing 90. The names of the surfaces constituting the housing 90 are the same as those in FIG. 2 (Embodiment 1). That is, the surface on which the projection lens 50 is disposed is the front surface 91, the surface opposite to the front surface 91 is the back surface 93, and the side surfaces adjacent to the front surface 91 and the back surface 93 are the side surfaces 92 and 94.

The housing 90 is formed with intake ports 47, 48, 65 and an exhaust port 63. Specifically, an air inlet 47 is formed in the vicinity of the light source side housing portion 80 on the back surface 93. The air inlet 47 is disposed at a position on the X axis (−) side of the back surface 93. In the rear surface 93, an air inlet 48 is formed in the vicinity of the mirror housing portion 85. The intake port 48 is disposed at a position on the X axis (+) side in the back surface 93. An exhaust port 63 is formed in the side surface 92. The exhaust port 63 is disposed at a position on the side surface 92 on the Y-axis (−) side. Note that the arrangement of the intake port 65, the exhaust port 63, and the projection lens 50 is the same as that in the first embodiment, and thus the description thereof is omitted.
The housing 90 accommodates the light source side housing part 80, the mirror housing part 85, the projection lens 50, the intake fans 8 and 9 (cooling part), the exhaust part 60, and the like.

The light source side housing portion 80 is disposed at the center of the housing 90. The light source unit 10 included in the light source side housing unit 80 has the same configuration as that of the first embodiment. The light beam emitted from the light source unit 10 toward the side surface 94 is transmitted through the color wheel 81 that is sequentially colored in three colors of red, green, and blue, and enters the mirror housing unit 85.
In the mirror housing portion 85, the light beam incident from the light source side housing portion 80 is reflected by the reflection mirror 87 and enters the micromirror display element 86. The micromirror display element 86 has a display area in which a plurality of pixels are arranged in a matrix, and controls the emission of light incident on the plurality of pixels. The light emitted under the control of the micromirror display element 86 enters the projection lens 50.

The configuration and arrangement of the projection lens 50 are the same as those in the first embodiment.
The intake fans 8 and 9 are cooling units, and in order to cool main heat generation parts in the projector 160, intake fans 8 and 9 for taking in external air are provided for each heat generation part. The main heat generating parts are the light source side housing part 80 and the mirror housing part 85.
The intake fan 8 is a sirocco fan provided at the intake port 47, sucks external air from the intake port 47, and blows air to the light source side housing portion 80 through the flow path 8 a. The flow path 8 a is a flow path for flowing air from the blower opening 82 on the front 91 side of the intake fan 8 toward the light source side housing portion 80. A part of the air blown into the light source side housing part 80 from the flow path 8a directly absorbs (cools) heat from the light source 11 as a heat source and the reflector 12 heated by the light source 11, and the light source side housing part 80 It is discharged to the flow path 8b provided on the side surface 92 side of the outer edge portion. The flow path 8 b is a flow path for flowing heated air from the outer edge of the light source side housing portion 80 toward the exhaust port 63.

  The intake fan 9 is a sirocco fan provided at the intake port 48, and sucks external air from the intake port 48 and blows air to the mirror housing portion 85 through the flow path 9a. The flow path 9 a is a flow path for allowing air to flow from the air blowing port 83 on the front 91 side of the intake fan 9 toward the mirror housing portion 85. The air blown into the mirror housing part 85 absorbs heat from the heat source in the mirror housing part 85 and is discharged to the flow path 9b. The flow path 9b is a flow path for flowing heated air from the outer edge of the mirror housing portion 85 toward the exhaust port 63 side.

In addition, as a cooling method of the light source side housing part 80 and the mirror housing part 85, although demonstrated as what blows air through a flow path in each housing part, it is not limited to this method. For example, the light source side housing part 80 and the mirror housing part 85 may be sealed, and cooling air may flow along the outer edge part of the light source side housing part 80 and the outer edge part of the mirror housing part 85, respectively. . Further, a heat sink portion may be provided on the back surface of the micromirror display element 86 and the outer edge portion of the mirror housing portion 85, and air may be flowed so as to absorb (cool) heat from the heat sink portion.
Since the configuration and arrangement of the exhaust unit 60 are the same as those in the first embodiment, description thereof is omitted.

As described above, according to the projector 160 according to the present embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
Since the exhaust unit 60 is provided, an exhaust function equivalent to that of a conventional projector is provided without the exhaust fan 3. Further, since the exhaust induction fan 61 in the exhaust unit 60 is disposed at a position where the heated air in the casing 90 does not hit, it is not exposed to the heated air. In other words, in the configuration of the exhaust unit 60, the exhaust induction fan 61 takes in only external air whose temperature is lower than that of the air in the housing 90, similarly to the intake fans 8 and 9.
Therefore, the projector 160 can make the life (durability) of the exhaust fan equivalent to that of the intake fan.
Therefore, even with a configuration using a micromirror display element, it is possible to provide a projector that suppresses variations in the life of a plurality of fans.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
FIG. 11 is a perspective view of the air guide according to the first modification.
In each of the above embodiments, as shown in FIG. 3, the shapes of the exhaust port 63 and the air guide body 64 are circular. However, the shape is not limited to this, and may be any ring shape. In other words, any shape that surrounds the periphery of the exhaust port that is the opening may be used.
For example, as shown in FIG. 11, the exhaust port 63b may be rectangular, and in this case, the air guide body 64b is also formed in a frame-like rectangle surrounding the exhaust port 63b. Even in this shape, the frame-shaped exhaust induction wind is ejected from the discharge port 67b of the air guide body 64b while expanding in a pyramid shape, so that the exhaust in the housing is similarly sucked into the exhaust port 63. It is discharged outside. In other words, even if it is a rectangle, the exhaust function similar to that of a circular air guide can be realized. In addition, not only a rectangle but a polygon may be sufficient and an ellipse may be sufficient. Even if it is these shapes, the same effect can be acquired.

  Further, the discharge port 67b is not limited to a continuous shape, and may be a divided shape. For example, in the case of FIG. 11, the slit-like discharge port 67b is divided at the approximate center of four sides. In other words, the discharge port of this modification has an aggregate configuration of four crank-shaped discharge ports 67b including rectangular vertices. Even in this configuration, the frame-shaped airflow is ejected while expanding into a pyramid shape as in the continuous shape, and thus the same effect can be obtained. Note that the number of divisions is not limited to four, and any division mode in which an annular exhaust induction wind is formed may be used. For example, a configuration in which a plurality of dot-shaped discharge ports are continuous may be employed, or a configuration in which oval discharge ports are arranged in a perforation with the longitudinal direction aligned. Even if it is these structures, the same effect can be acquired.

  As described above, according to the configuration of the exhaust port and the air guide body of this modification, the design and the degree of freedom of design can be improved. In other words, it is possible to provide a projector that meets usage scenes and needs.

(Modification 2)
FIG. 12 is a perspective view of the air guide according to the second modification.
In the first embodiment, as illustrated in FIG. 2, the exhaust port 63 and the air guide body 64 in the exhaust unit 60 have been described as being configured as a set on the side surface 92. It is not limited. In other words, the exhaust unit 60 may have a configuration including the exhaust port 63 and the air guide body 64 divided into a plurality of sets.
For example, as shown in FIG. 12, the exhaust port is divided into rectangular exhaust ports 63c and 63d, and the air guide bodies 64c and 64d including the discharge ports 67c and 67d are surrounded around the exhaust ports 63c and 63d, respectively. It is good also as a structure formed in. Even in this configuration, the frame-shaped exhaust guide wind is ejected from the discharge ports 67c and 67d while expanding in a pyramid shape. Therefore, as in the first embodiment, the exhaust in the housing is exhausted to the exhaust ports 63c and 63d. Is sucked and discharged to the outside. In other words, even with this configuration, the same effects as those of the first embodiment can be obtained.

  As described above, according to the configuration of the exhaust port and the air guide body of this modification, the design and the degree of freedom of design can be improved. In other words, it is possible to provide a projector that meets usage scenes and needs.

(Modification 3)
FIG. 13 is a cross-sectional view around the exhaust port according to the third modification.
In each of the above embodiments, as shown in FIG. 2, a structure or the like is not particularly provided on the outer side of the exhaust port 63, but the present invention is not limited to this configuration. In other words, a structure in which a necessary structure or the like is provided on the side surface 92 of the housing 99 that is the outside of the exhaust port 63 may be used.
For example, as shown in FIG. 13, a configuration may be adopted in which a shutter 55 that has a rotation shaft and can be opened and closed is provided outside the exhaust port 63. The shutter 55 may include a mechanism that opens when the main power of the projector is turned on and closes when the main power is turned off. Even with this configuration, the same effects as those of the first embodiment can be obtained.
Furthermore, the shutter 55 is closed when the projector is not used, so that dust can be prevented from entering the housing 99. In addition, by setting the installation interval of the shutter 55 to be smaller than the thickness of a human fingertip, an accident in which the fingertip is erroneously inserted into the housing 99 when the projector is operating can be prevented.

  As described above, according to the configuration in which the shutter is provided on the outside of the exhaust port according to the present modification, it is possible to prevent dust from entering the housing and accidents. In other words, a projector with improved reliability and safety can be provided.

(Modification 4)
FIG. 14 is a cross-sectional view around an exhaust port according to Modification 4.
As described in Modification 3 above, a configuration in which a necessary structure or the like is provided on the side surface 92 of the housing 99 that is the outside of the exhaust port 63 may be used.
For example, as shown in FIG. 14, a configuration in which a louver 56 is provided on the outside of the exhaust port 63 may be used. The louver 56 may be fixed at an angle at which the exhaust gas faces obliquely downward (bottom surface 96 (Z-axis (+)) side). Further, the louver 56 may be configured to be integrally formed with the housing 99. Even if it is these structures, the effect similar to Embodiment 1 can be acquired.
Further, the louver 56 can prevent dust from entering the housing 99 when the projector is not used. Moreover, by setting the installation interval of the louvers 56 to be smaller than the thickness of a human fingertip, an accident in which the fingertip is erroneously inserted into the housing 99 when the projector is operating can be prevented.

  As described above, according to the configuration in which the louver is provided on the outer side of the exhaust port of the present modification, it is possible to suppress dust intrusion into the housing and prevent an accident. In other words, a projector with improved reliability and safety can be provided.

(Modification 5)
In each of the above-described embodiments and modifications, the configuration related to the exhaust unit 60 has been described using the projector as an example, but the application destination of the exhaust unit 60 is not limited to the projector. In other words, in various electronic devices having a heat generating portion, the same configuration as the exhaust unit 60 may be applied in order to exhaust the heated air in the housing.
For example, in an electronic device equipped with a CPU (Central Processing Unit), the CPU is a semiconductor element that is integrated at a high density and operates at a high speed, and generates heat when a current flows (operates). Then, problems such as thermal runaway may occur. For this reason, electronic devices such as a personal computer and a constant current power supply device equipped with a CPU are provided with an exhaust fan that exhausts heated air in the housing. Further, in a liquid crystal television, a fluorescent lamp or the like is used as a backlight for illuminating a liquid crystal panel from the back. Since this backlight constantly illuminates the entire liquid crystal panel while the liquid crystal television is being used, the larger the liquid crystal panel, the larger the power consumption and the greater the amount of heat generated. The heat generated by the backlight may affect the control unit that performs data conversion of the video signal. For this reason, some liquid crystal televisions include an exhaust fan that exhausts the heated air in the housing.
In these electronic devices, a configuration similar to that of the exhaust unit 60 may be applied in order to exhaust the heated air in the housing. By applying the same configuration as that of the exhaust unit 60, the exhaust induction fan is disposed at a position where the heated air in the casing does not hit, and thus is not exposed to the heated air. In other words, even with this configuration, the same effects as those of the first embodiment can be obtained.

As described above, according to the present modification, since the external air taken in by the exhaust induction fan is discharged from the discharge port, a negative pressure is generated at the center of the exhaust port. A flow is established in which the air is drawn toward the exhaust port and finally discharged through the exhaust port to the outside of the housing.
Therefore, it is possible to provide an electronic device having the same functions and effects as those of the first embodiment.

  1, 2, 8, 9 ... intake fan, 1a, 2a ... cooling air flow path, 1b, 2b ... heated air flow path, 3 ... fan (exhaust fan), 10 ... light source unit, 11 ... light source, DESCRIPTION OF SYMBOLS 15 ... Polarization conversion part, 20 ... Color separation optical part, 25 ... Relay optical part, 30 ... Light modulation part, 40 ... Optical unit, 45, 46, 47, 48, 65, 75 ... Air inlet, 50 ... Projection lens, 55 ... Shutter, 56 ... Louver, 60, 70 ... Exhaust section, 61, 71 ... Exhaust induction fan, 62, 72 ... Exhaust induction wind channel, 63, 63b, 63c, 63d, 73 ... Exhaust port, 64, 74 DESCRIPTION OF SYMBOLS ... Air guide body, 67, 77 ... Discharge port, 77, 78, 79 ... Duct which flows the heated air, 81 ... Color wheel, 86 ... Micro mirror display element, 90, 99 ... Case, 91 ... Front of case , 92, 94 ... side surface of the casing, 93 ... rear surface of the casing 100 ... projector.

Claims (9)

A light source;
A light modulation unit that generates modulated light obtained by modulating light emitted from the light source according to an image signal;
A projector that includes at least the light source and a housing that houses the light modulation unit,
An exhaust port formed in the housing;
An air guide installed so as to surround the outer edge of the exhaust port;
An exhaust induction fan that takes in external air;
A flow path for flowing the air taken in by the exhaust induction fan through the air guide body,
The projector according to claim 1, wherein the air guide body is formed with a discharge port for blowing the air in an annular shape to the outside of the housing.   The projector according to claim 1, wherein an air inlet is further formed in the housing.   The projector according to claim 2, wherein a fan that takes outside air into the housing is provided at the intake port.   The projector according to claim 1, wherein the air blown out from the discharge port forms a jet whose ring expands in a conical shape. When the exhaust part is a first exhaust part,
A second exhaust part disposed inside the housing and on the windward side of the first exhaust part, further comprising:
The second exhaust part is
An annular second air guide disposed on the windward side of the exhaust port;
A second exhaust induction fan that takes in external air;
A flow path for flowing the air taken in by the second exhaust induction fan to the second air guide body,
The projector according to any one of claims 1 to 4, wherein the second air guide body is formed with a discharge port for blowing the air in an annular shape toward the exhaust port. A light source;
A light modulation unit that generates modulated light obtained by modulating light emitted from the light source according to an image signal;
A projector that includes at least the light source and a housing that houses the light modulation unit,
An intake fan that takes in external air;
An exhaust port formed in the housing;
An air guide installed so as to surround the outer edge of the exhaust port;
The air taken in by the intake fan has a flow path that guides the exhaust after cooling the light source or the light modulation unit to the air guide body,
The projector according to claim 1, wherein the air guide body is formed with a discharge port for blowing the air in an annular shape to the outside of the housing.   The projector according to claim 1, wherein the exhaust port is provided with a shutter.   The projector according to claim 1, wherein a louver is provided in the exhaust port. A housing,
An exhaust port formed in the housing;
An air guide installed so as to surround the outer edge of the exhaust port;
An exhaust induction fan that takes in external air;
A flow path for flowing the air taken in by the exhaust induction fan through the air guide body,
The electronic apparatus according to claim 1, wherein the air guide body is formed with a discharge port that blows out the air in an annular shape to the outside of the housing.

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