JP2009025771A - Electronics - Google Patents

Abstract

To provide an electronic device capable of appropriately adjusting the area of a filter body, reducing the frequency of cleaning the filter body, and reducing a burden on a user.
A projector 1 as an electronic device includes a first filter unit 20 having a first duct 21 that can be connected to an exterior case 2 and that guides outside air through a first filter 22 to an intake port 12, and a second filter. And a second filter unit 30 having a second duct 31 that guides external air through 32 to the first duct 21. The second filter unit 30 can be connected to the first filter unit 20 and the other second filter unit 30, and the ducts 21 and 31 are formed with first and second communication ports 26 and 35 communicating with each other. The second duct 31 is formed with an auxiliary communication port 36 that communicates with the other second duct 31 via the second communication port 35.
[Selection] Figure 3

Description

  The present invention relates to an electronic apparatus including an exterior housing having an air inlet and a cooling fan that is housed in the exterior housing and introduces external air from the air inlet.

2. Description of the Related Art Conventionally, an electronic device in which an electronic component or the like is housed inside a housing includes an intake fan for air-cooling the electronic component and a filter for removing dust and the like from air sucked by the intake fan. An electronic device provided is known (see, for example, Patent Document 1).
In the projector described in Patent Document 1, a first filter is provided in an air intake port formed in an exterior case. In addition, a filter unit having a second filter having a larger area than the first filter is provided in the exterior case so as to cover the air intake port from the outside of the first filter. According to such a configuration, since the second filter has a larger area than the first filter, if the filter unit is attached, the time until the filter is clogged becomes longer.

JP 2004-157347 A

  However, in the projector described in Patent Document 1, the area of the filter as the filter body can be changed only in two ways, with or without the filter unit, and the concentration of dust in the air. It cannot be said that the area of the filter corresponding to the is selected. For this reason, the area of the second filter provided in the filter unit must be made larger than necessary, or when used in air with a high dust concentration, the filter unit is attached. However, there is a problem that the frequency of cleaning the filter cannot be sufficiently reduced.

  The objective of this invention is providing the electronic device which can adjust the area of a filter body suitably, can reduce the frequency of cleaning of a filter body, and can reduce a user's burden.

  An electronic device of the present invention is an electronic device that includes an exterior housing having an air inlet and a cooling fan that is housed in the exterior housing and introduces external air from the air inlet, and is connected to the exterior housing. 1 filtration unit, and the 2nd filtration unit connectable with the 1st filtration unit, and the 1st filtration unit removes dust etc. from external air, and it is the inside via the 1st filtration body. The second filtering unit has a first duct for guiding the external air taken in to the air inlet, and the second filtration unit removes dust and the like from the external air, and the second air takes in the external air taken in via the second filter. The first duct and the second duct are respectively formed with a first communication port and a second communication port that communicate with each other in a state of being connected to each other. To enable communication with the second filtration unit Wherein the passing hole is formed.

  According to the present invention, the second filtration unit is provided so as to be connectable to the first filtration unit and is also provided so as to be connectable to another second filtration unit. Therefore, the area of the filter body can be changed. it can. When another second filtration unit is repeatedly connected to the second filtration unit, the area of the filter body is increased according to the number of connected second filtration units.

  According to such a configuration, the total area of the filter bodies can be easily changed by changing the number of the second filtration units to be connected. Therefore, according to the concentration conditions such as dust in the air. Thus, the area of the filter body can be adjusted as appropriate. In particular, when used in air with a high dust concentration, the number of connections of the second filtration units can be increased to increase the area of the filter body, so that the frequency of cleaning the filter body can be sufficiently reduced. , The burden on the user can be reduced.

  In the electronic apparatus of the present invention, the second filtration unit can be connected to the first filtration unit in a direction substantially perpendicular to the central axis of the air inlet, and the first duct is connected to the exterior housing. It is preferable to have a plurality of fixing portions for fixing, and the plurality of fixing portions are provided at a rotationally symmetric position of approximately 90 degrees around the central axis of the intake port.

  According to the present invention, since the second filtration unit is provided so as to be connectable to the first filtration unit in a direction perpendicular to the central axis of the intake port, for example, the intake port is provided on the side surface of the exterior housing. In such a case, the second duct is disposed via the first duct in any one of the four directions of the front side, the top side, the back side, and the bottom side from the position of the intake port. Further, the first duct is provided with a fixing portion for fixing the first filtration unit to the exterior housing at a rotationally symmetric position of about 90 degrees around the central axis of the intake port. Can be connected in a state of being rotated about every 90 degrees around the central axis. Therefore, the optimal arrangement direction of the second filtration unit can be freely selected from the four directions according to the use state of the electronic device, and the space around the electronic device can be used effectively.

  In the electronic device of the present invention, the first filtration unit has a first shielding member that can close the first communication port, and the first shielding member has a closed position that closes the first communication port, and the first duct. It is pivotally attached to an open position that pivots inside to open the first communication port. The first duct is opened on the second duct in a state where the first duct and the second duct are connected to each other. A pressing member that presses and rotates to a position is formed, the second filtration unit includes a second shielding member that can close the auxiliary communication port, and the second shielding member is a closed position that closes the auxiliary communication port. The second filtration unit and the other second filtration unit are connected to each other in a state where the second filtration unit and the other second filtration unit are connected to each other. It is preferably rotated to the open position by another pressing member formed on the duct. Arbitrariness.

  According to the present invention, in a state where the second filtering unit is connected to the first filtering unit by the first shielding member and the pressing member, the pressing member presses the first shielding member into the first duct and rotates. Therefore, the first communication port is opened. Further, in a state where another second filtration unit is connected to the second filtration unit by the second shielding member and the pressing member, the other pressing member formed in the other second duct causes the second shielding member to become the second shielding unit. Since the two ducts are pressed and rotated, the auxiliary communication port is opened. Therefore, the first communication port can be opened simply by connecting the second filtration unit to the first filtration unit, and the auxiliary communication port can be opened simply by connecting another second filtration unit to the second filtration unit. Thus, the connecting operation between the first filtering unit and the second filtering unit and the connecting operation between the second filtering unit and another second filtering unit can be facilitated. Further, in a state where the second filtration unit is not connected to the first filtration unit, the first communication port is closed by the first shielding member, and in a state where no other second filtration unit is connected to the second filtration unit. Since the auxiliary communication port is closed by the second shielding member, dust can be prevented from entering the first filtration unit and the second filtration unit.

  An electronic apparatus according to the present invention includes a light source, a light modulation device that modulates light emitted from the light source according to input image information to form an optical image, and projection optics that enlarges and projects the formed optical image. It is preferable that the projector includes a device.

  According to the present invention, the above-described effects can be suitably achieved by using the above-described electronic apparatus as a projector.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Overall configuration of projector 1]
FIG. 1 is a front view of a projector 1 according to the present embodiment.
The projector 1 modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIG. 1, the projector 1 includes a substantially rectangular parallelepiped outer case 2 and a projection lens 3 exposed from the outer case 2, and is suspended from a ceiling bracket 11.
A projection lens 3 as a projection optical device enlarges and projects an optical image modulated by the main body portion of the projector 1 according to image information. The projection lens 3 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical barrel.

The outer case 2 is an outer casing made of synthetic resin and houses an optical unit that is a main body portion of the projector 1.
Further, in a space other than the optical unit, a cooling unit 6 including a cooling fan 5 that cools the inside of the projector 1, a power supply unit that supplies power to each component in the projector 1, and a control unit that controls the entire projector 1 Etc. are arranged.
The projection lens 3 is exposed on the front surface of the outer case 2, and an air inlet 12 is formed on the side surface 15 of the right side in FIG. 1 when viewed from the front of the outer case 2.
A filter unit 10 described later is attached to the air inlet 12. The cooling fan 5 introduces external air into the exterior case 2 through the filter unit 10 from the air inlet 12.
As shown in FIG. 3 to be described later, the air inlet 12 is formed in a recess 14 in which a part of the side surface 15 of the outer case 2 is recessed in a square shape. Two female screw portions 13 for fixing the filter unit 10 are also formed inside the concave portion 14. The two female screw portions 13 are formed in a cylindrical shape protruding from the bottom surface of the recess 14.
A sealing member (not shown) is provided around the recess 14 to seal the gap between the recess 14 and the filter unit 10 when the filter unit 10 is attached.
Although the filter and the filter cover can be used directly attached to the intake port 12, in this embodiment, the filter and the filter cover are removed and the filter unit 10 described later is used. The case will be described.

[Configuration of Optical Unit 4]
FIG. 2 is a diagram showing a schematic configuration of the optical unit 4.
The optical unit 4 forms image light and enlarges and projects it on a screen under the control of a control device (not shown). As shown in FIG. 2, the optical unit 4 includes a light source device 41, an illumination optical device 42, a color separation optical device 43, a relay optical device 44, an optical device 45, and a projection lens 3. It has a substantially L-shape.

The light source device 41 emits a light beam toward the illumination optical device 42. The light source device 41 includes a light source device main body 411 and a light source driving unit (not shown) that drives (lights) a light source lamp 4111 constituting the light source device main body 411 with a predetermined drive voltage under the control of the control device.
As shown in FIG. 2, the light source device main body 411 includes a light source lamp 4111 that performs discharge light emission between a pair of electrodes, a main reflecting mirror 4112, and a parallelizing lens 4113.
Then, the light beam emitted from the light source lamp 4111 is emitted as a converged light with the emission direction aligned to the front side of the light source device body 411 by the main reflecting mirror 4112, collimated by the collimating lens 4113, and applied to the illumination optical device 42. It is injected. In the figure, A indicates the optical axis of the light beam from the light source device 41 to the projection lens 3.
Here, as the light source lamp 4111, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. In addition, the main reflecting mirror 4112 is configured by an ellipsoidal reflector in the present embodiment, but may be configured as a parabolic reflector that reflects the light beam emitted from the light source lamp 4111 substantially in parallel. In this case, the collimating lens 4113 is omitted.

  As shown in FIG. 2, the illumination optical device 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424. The light beam emitted from the light source device 41 is divided into a plurality of partial light beams by the first lens array 421 and forms an image in the vicinity of the second lens array 422. Each partial light beam emitted from the second lens array 422 is incident so that the central axis (principal ray) thereof is perpendicular to the incident surface of the polarization conversion element 423, and the polarization conversion element 423 makes approximately one type of straight line. It is emitted as polarized light. A plurality of partial light beams emitted from the polarization conversion element 423 as linearly polarized light and passed through the superimposing lens 424 are superimposed on three liquid crystal panels (to be described later) of the optical device 45.

As shown in FIG. 2, the color separation optical device 43 includes two dichroic mirrors 431 and 432 and a reflection mirror 433, and the dichroic mirrors 431 and 432 and the reflection mirror 433 emit the light from the illumination optical device 42. It has a function of separating a plurality of partial light beams into three color lights of red, green, and blue.
As shown in FIG. 2, the relay optical device 44 includes an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444, and the color light separated by the color separation optical device 43, for example, red light, is an optical device. 45 has a function of leading to a later-described red light side liquid crystal panel.

  The optical device 45 modulates an incident light beam according to image information to form image light (color image). As shown in FIG. 2, the optical device 45 includes three liquid crystal panels 451 (the liquid crystal panel on the red light side is 451R, the liquid crystal panel on the green light side is 451G, and the liquid crystal panel on the blue light side is 451B), An incident-side polarizing plate 452 disposed on the front side of the optical path of each liquid crystal panel 451, an exit-side polarizing plate 453 disposed on the rear side of the optical path of each liquid crystal panel 451, and a cross dichroic prism 454 as a color combining optical device. Prepare.

The three incident-side polarizing plates 452 transmit only polarized light having substantially the same polarization direction as the polarization direction aligned by the polarization conversion element 423 among the light beams separated by the color separation optical device 43, and other light beams. The polarizing film is affixed on the translucent substrate.
The three liquid crystal panels 451 have a configuration in which a liquid crystal as an electro-optical material is hermetically sealed in a pair of transparent glass substrates, and the alignment state of the liquid crystal is controlled according to a drive signal from a control device (not shown). The polarization direction of the polarized light beam emitted from the incident side polarizing plate 452 is modulated.
The three exit-side polarizing plates 453 have substantially the same function as the incident-side polarizing plate 452 and transmit polarized light in a certain direction among the light beams emitted through the liquid crystal panel 451 and absorb other light beams. To do.

The cross dichroic prism 454 synthesizes each color light modulated for each color light emitted from the emission side polarizing plate 453 to form a color image. The cross dichroic prism 454 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right-angle prisms are bonded together. These dielectric multilayer films transmit color light emitted from the liquid crystal panel 451G and transmitted through the emission side polarizing plate 453, and reflect each color light emitted from the liquid crystal panels 451R and 451B and transmitted through the emission side polarizing plate 453. In this way, the color lights are combined to form a color image.
The projection lens 3 enlarges and projects the color image formed by the cross dichroic prism 454 on the screen.

[Configuration of Filter Unit 10]
FIG. 3 is an exploded perspective view of the filter unit 10 when the projector 1 installed in the state of FIG. 1 is viewed from below.
The filter unit 10 is for removing dust and the like from the external air sucked into the exterior case 2, and includes a first filter unit 20 as a first filtration unit and two second filters as a second filtration unit. A unit 30 is provided.

  The first filter unit 20 is formed in a substantially rectangular parallelepiped shape, and includes a first duct 21, a first filter 22 as a first filter body, and a first filter cover 23. It is provided for filtering with the filter 22 and guiding it to the air inlet 12 of the outer case 2.

The first duct 21 is a cylinder whose cross-sectional shape perpendicular to the longitudinal direction is formed in a substantially square shape, and both end portions of the first duct 21 are open.
A first introduction port 24 for introducing external air is formed at one end of the first duct 21 opposite to the exterior case 2 side, and a first discharge port 25 is formed at the other end of the exterior case 2 side. Has been.
A first filter 22 formed in a substantially square plate shape and a first filter cover 23 formed with a plurality of intake holes are attached to the first introduction port 24. External air is sucked into the first duct 21 from the plurality of intake holes of the first filter cover 23 and is removed through the first filter 22.

The first duct 21 is fixed in a state of being fitted to the air inlet 12 of the outer case 2. Specifically, the two set screws 29 are respectively inserted into the screw hole portions 28 formed on the inner peripheral edge of the first discharge port 25, and the female screw portions formed at two locations in the recess 14 of the exterior case 2. 13 is screwed. The air taken into the first duct 21 is guided into the intake port 12 from the first discharge port 25 and is introduced into the exterior case 2 through the intake port 12.
In addition, the screw hole part 28 by the side of the 1st discharge port 25 comprises the fixing | fixed part of this invention, and is each provided in the center of each edge | side in the periphery formed in the substantially square shape of the said 1st discharge port 25, and is total There are four places. That is, the screw hole portion 28 is provided at a rotationally symmetric position of about 90 degrees around the central axis 16 of the air inlet 12. On the other hand, the female screw portion 13 on the exterior case 2 side is formed at a position corresponding to one set of screw hole portions 28 facing each other among the four screw hole portions 28. In this way, even when the first duct 21 is rotated about the central axis 16 of the air inlet 12 approximately every 90 degrees, any one set of screw hole portions 28 and the female screw portion 13 that face each other. The first duct 21 and the outer case 2 can be connected to each other.

Further, the first duct 21 is provided with a first communication port 26 and a first shielding member 27, and the first duct 21 and the second filter unit 30 of the first filter unit 20 are provided by the first communication port 26. The 2nd duct 31 mentioned later is connected.
The first communication port 26 is formed in the outer peripheral portion of the first duct 21 and opens in a direction orthogonal to the central axis 16 of the intake port 12 of the exterior case 2. In FIG. 3, for example, the first duct 21 is connected to the intake port 12 so that the first communication port 26 faces upward in the drawing.
The first shielding member 27 is formed in a rectangular flat plate shape, and is configured to be able to open and close the first communication port 26. That is, the first shielding member 27 is pivotally supported on the inner peripheral edge of the first communication port 26, and is rotated to the closed position where the first communication port 26 is closed and the first duct 21. It is rotatably attached to an open position that opens the communication port 26. In addition, the 1st shielding member 27 is urged | biased by the direction which becomes a closed state (state which obstruct | occludes the 1st communicating port 26) by urging means, such as a coil spring which is not shown in figure.

  The second filter unit 30 is formed in a hollow substantially cubic shape having a dimension shorter than the dimension in the longitudinal direction of the first filter unit 20, and includes a second duct 31 and a second filter 32 as a second filter body. And a second filter cover 33. The second duct 31 of the second filter unit 30 is connected to the first duct 21 of the first filter unit 20 and is provided for filtering the external air through the second filter 32 and guiding the external air to the first duct 21. It has been.

  As shown in FIG. 3, the second duct 31 is formed with a substantially square second introduction port 34 for taking in external air. A second surface having a substantially square shape smaller than the second introduction port 34 is formed on a surface adjacent to the second introduction port 34 in the second duct 31, that is, a surface facing the first communication port 26 of the first duct 21 in FIG. 3. A communication port 35 is formed. In addition, on the surface of the second duct 31 that faces the second communication port 35, the auxiliary communication port 36 and the second shielding member 37 are provided in the same manner as the first communication port 26 and the first shielding member 27 of the first duct 21. Is formed.

  Similar to the first filter 22 and the first filter cover 23, the second filter 32 and the second filter cover 33 are attached to the second introduction port 34. The external air is sucked into the second duct 31 through a plurality of intake holes formed in the second filter cover 33, and is removed through the second filter 32.

The second communication port 35 of the second duct 31 has four locking members 38 and two pressing members 39.
The locking member 38 is formed so as to protrude from the outer peripheral edge portion of the second communication port 35, and the tip end portion is formed to be able to be locked with the peripheral edge portion of the first communication port 26 of the first duct 21.
The pressing member 39 is for pressing the first shielding member 37 of the first duct 21 and rotating it to the open position in a state where the first filter unit 20 and the second filter unit 30 are connected. That is, the pressing member 39 is formed so as to protrude from the outer peripheral edge portion of the second communication port 35, and is provided at a position that does not overlap with the locking member 38. With such a configuration, the first shielding member 27 of the first filter unit 20 is rotated and opened by the pressing member 39 in a state where the first filter unit 20 and the second filter unit 30 are connected. .

  A second duct 31 of another second filter unit 30 is connected to the auxiliary communication port 36 of the second duct 31. When another second filter unit 30 is connected to the second filter unit 30, the second shielding member 37 of the second filter unit 30 is opened by the pressing member 39. The second filter unit 30 and the other second filter unit 30 communicate with each other through the auxiliary communication port 36. Further, as shown in FIG. 1, when the projector 1 is used by being suspended from the ceiling by arranging the two second filter units 30 so as to be stacked vertically upward with respect to the first filter unit 20, The filter unit 10 does not get in the way. Further, the arrangement direction of the second filter unit 30 can be changed as appropriate, and the space around the projector 1 can be used effectively.

[Method of connecting filter units 10]
4 and 5 show a method of connecting the first duct 21 of the first filter unit 20 and the second duct 31 of the second filter unit 30, and are sectional views showing states before and after the connection.
As shown in FIGS. 4 and 5, when the second communication port 35 of the second filter unit 30 is brought close to the first communication port 26 of the first filter unit 20, the pressing member 39 of the second filter unit 30 is The first shielding member 27 of the first filter unit 20 is pushed open, and the internal space of the second filter unit 30 communicates with the internal space of the first filter unit 20.
Further, the locking member 38 of the second filter unit 30 is locked to the peripheral edge portion of the first communication port 26 of the first filter unit 20. In this way, the second duct 31 of the second filter unit 30 is connected to the first duct 21 of the first filter unit 20. Similarly, the second duct 31 of the other second filter unit 30 is connected to the second duct 31 connected to the first duct 21.
External air sucked from the filters 22 and 32 of the filter units 20 and 30 is introduced into the air inlet 12 of the outer case 2. That is, the external air sucked from the second filter 22 of the second filter unit 30 is merged with the external air in the first duct 21 through the second duct 31 and the first communication port 26. In addition, the external air sucked from the second filter 22 of the other second filter unit 30 is merged with the external air in the second duct 31 through the second duct 31 and the auxiliary communication port 36.

[Filter area adjustment method]
The second duct 31 of the second filter unit 30 is provided so as to be connectable to the first duct 21 of the first filter unit 20, and is also provided so as to be connectable to the second ducts 31 of other second filter units 30. Therefore, the total value of the areas of the filters 22 and 32 can be changed as follows.
As a first adjustment method, the first duct 21 is connected to the air inlet 12, and the second duct 31 is not connected to the first duct 21. In this way, the total value of the filter area is the area (area A) of the first filter 22.
As a second adjustment method, the first duct 21 is connected to the air inlet 12, and the second duct 31 is connected to the first duct 21. In this way, the total value of the filter areas is the total area (area B) of the area of the first filter 22 and the area of the second filter 32.
As a third adjustment method, the first duct 21 is connected to the air inlet 12, the second duct 31 is connected to the first duct 21, and the second duct of the other second filter unit 30 is connected to the second duct 31. 31 are connected. In this way, the total value of the filter areas is the total area (area C) of the area of the first filter 22 and the areas of the two second filters 32.
Furthermore, if another second duct 31 is repeatedly connected to the second duct 31 as necessary, the filter area according to the number of connected second ducts 31 can be obtained.
Thus, the filter area can be adjusted as appropriate by changing the number of second ducts 31 connected to the first duct 21.

[Effects of this embodiment]
According to this embodiment, the following effects can be achieved.
(1) Since the total value of the areas of the filters 22 and 32 can be easily increased only by increasing the number of the second ducts 31 to be connected, the area of the filter corresponding to the concentration conditions such as dust in the air Can be appropriately selected by the user. Therefore, the frequency of cleaning the filters 22 and 32 can be sufficiently reduced, and the burden on the user can be reduced. In particular, when the projector 1 is installed on the ceiling of a room or the like, a large burden on the user can be reduced, and usability can be improved.

(2) Since the first duct 21 is provided so as to be connectable in a state of being rotated about every 90 degrees around the central axis 16 of the air inlet 12, the connection direction of the second duct 31 with respect to the first duct 21 is determined as follows. Along the side surface 15 of the outer case 2, it can be arranged in any of four directions from the air inlet 12, the front side, the upper side, the back side, and the lower side. Therefore, the optimal arrangement direction of the second filter unit 30 according to the mounting state of the projector 1 can be selected from four directions, and the space around the projector 1 can be used effectively.

(3) In the second duct 31, the first shielding member 27 or the second shielding member 37 with the second duct 31 attached to the first communication port 26 or the auxiliary communication port 36 of another second duct 31. Since the pressing member 39 that rotates the inside of the ducts 21 and 31 is formed, the first shield 21 or the other second duct 31 can be connected to the second duct 31 only by connecting the first shielding. The member 27 or the second shielding member 37 can be opened. Therefore, the connection work between the first duct 21 and the second duct 31 and the connection work between the second ducts 31 can be facilitated.

(4) In a state where the second duct 31 is not connected to the first duct 21, the first communication port 26 is closed by the first shielding member 27, and another second duct 31 is connected to the second duct 31. In the absence, the auxiliary communication port 36 is closed by the second shielding member 37, so that dust can be prevented from entering the first duct 21 and the second duct 31.

[Modification of the present invention]
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.
For example, in the above-described embodiment, two second filter units are provided, but may be one, or may be three or more.
In the embodiment, the areas of the first filter and the second filter are the same, but may be different. Moreover, the material and dust removal performance of the first filter and the second filter may be the same or may be changed according to the installation environment.

  In the above embodiment, the first shielding member has been described as being movably or pivotably provided in the closed position for closing the first communication port and the open position for opening the first duct. The first duct may be detachably provided and may be removed when the second filtration unit is connected to the first filtration unit. Similarly, the second shielding member is also provided so as to be removable from the second duct, and may be removed when another second filtration unit is connected to the second filtration unit. Good.

In the above embodiment, the first filter unit and the second filter unit have been described as filter units having different shapes, but the first filtration unit and the second filtration unit of the present invention are common filtration units. Also good.
In the above-described embodiment, it has been described that the first duct 21 is configured to be attachable to the intake port 12 of the exterior case 2 even when the first duct 21 is rotated approximately every 90 degrees. The first duct may be attached around the central axis of the air inlet at every angle other than 90 degrees, or may be attached even after being rotated to an arbitrary angle.

  In the above-described embodiment, a ceiling-mounted projector has been described. However, the projector according to the present invention is not limited to the ceiling-mounted projector, and may be a projector used in a table-mounted manner. Further, the electronic apparatus of the present invention is not limited to the projector according to the above-described embodiment, and may be, for example, a television receiver, a video playback device, or the like.

In the embodiment, the projector 1 is configured by a three-plate projector having three liquid crystal panels 451. However, the projector 1 may be configured by a single-plate projector having one liquid crystal panel. Moreover, you may comprise as a projector provided with two liquid crystal panels, or a projector provided with four or more liquid crystal panels.
In the above embodiment, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In the embodiment, the liquid crystal panel is used as the light modulation device. However, a light modulation device other than liquid crystal, such as a device using a micromirror, may be used. In this case, the polarizing plates 452 and 453 on the light incident side and the light emitting side can be omitted.
In the above embodiment, the projector 1 is a front type projector that projects an image from the direction of observing the screen. However, the projector of the present invention is a rear type that projects an image from the side opposite to the direction of observing the screen. It does not matter as a projector.

1 is a front view showing a projector as an electronic apparatus according to an embodiment of the invention. The figure which shows typically the optical system of the optical unit of the said projector. The disassembled perspective view which shows the filtration unit of the said projector. Sectional drawing for demonstrating the connection method of the filtration unit of the said projector. Sectional drawing for demonstrating the connection method of the filtration unit of the said projector.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector (electronic device), 2 ... Exterior case (exterior housing | casing), 3 ... Projection lens (projection optical apparatus), 12 ... Air inlet, 16 ... Center axis of air inlet, 20 ... 1st filter unit (1st Filtration unit), 21 ... first duct, 22 ... first filter (first filter body), 26 ... first communication port, 27 ... first shielding member, 28 ... screw hole (fixed portion), 30 ... second Filter unit (second filtration unit), 31 ... second duct, 32 ... second filter (second filter body), 35 ... second communication port, 36 ... auxiliary communication port, 37 ... second shielding member, 39 ... pressing 451, 451B, 451G, 451R ... liquid crystal panel (light modulation device), 4111 ... light source lamp (light source).

Claims (4)

An electronic device comprising an exterior housing having an air inlet and a cooling fan that is housed in the exterior housing and introduces external air from the air inlet,
A first filtration unit coupled to the exterior housing;
A second filtration unit connectable to the first filtration unit,
The first filtration unit has a first filter body that removes dust and the like from the external air, and a first duct that guides the external air taken inside through the first filter body to the intake port,
The second filtration unit has a second filter body that removes dust and the like from the external air, and a second duct that guides the external air taken in via the second filter body to the first filtration unit,
The first duct and the second duct are respectively formed with a first communication port and a second communication port that communicate with each other in a connected state.
The second duct is formed with an auxiliary communication port that allows communication with another second filtration unit. The electronic device according to claim 1,
The second filtration unit is connectable to the first filtration unit in a direction substantially perpendicular to the central axis of the intake port,
The first duct has a plurality of fixing portions for fixing the first filtration unit to the exterior housing,
The electronic device, wherein the plurality of fixing portions are provided at a rotationally symmetric position of about 90 degrees around a central axis of the air inlet. The electronic device according to claim 1 or 2,
The first filtration unit has a first shielding member capable of closing the first communication port,
The first shielding member is rotatably attached to a closed position that closes the first communication port and an open position that rotates inside the first duct and opens the first communication port.
The second duct is formed with a pressing member that presses and rotates the first shielding member to the open position in a state where the first duct and the second duct are connected to each other.
The second filtration unit has a second shielding member capable of closing the auxiliary communication port,
The second shielding member is rotatably attached to a closed position that closes the auxiliary communication port and an open position that rotates inside the second duct and opens the auxiliary communication port. The electronic device is rotated to the open position by another pressing member formed in the other second duct in a state where the second filtration unit and the other second filtration unit are connected to each other. In the electronic device in any one of Claims 1-3,
The electronic apparatus includes a light source, a light modulation device that modulates light emitted from the light source according to input image information to form an optical image, and a projection optical device that enlarges and projects the formed optical image. An electronic apparatus characterized by being a projector equipped with

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