JP2007264247A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of altering an exhaust direction according to an installation condition and easily matching the direction of a projection image to the installation condition. <P>SOLUTION: An exhaust section 40 is rotatable in the direction of an arrow g around a joint part that serves as an altering means, and has an exhaust port 41 in a face corresponding to the upper face Su of the projector 100. Rotating the exhaust section 40 makes it possible to dispose the exhaust port 41 on the upper face Su side or the lower face Sd side of the projector 100. Accordingly, regardless of whether the projector is installed in a normal position or suspended position, the opening 41 can be disposed in the ceiling face. The projector 100 has: a switching means for outputting a switch signal indicating an installation mode according to the rotation of the exhaust section 40; and an image switching means for inverting an image with a change in a switch signal level as a trigger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a projector that enlarges and projects an image, and more particularly to a technique for cooling the projector.

There is known a projector that uses a discharge lamp such as a high-pressure mercury lamp or a metal halide lamp as a light source, modulates light emitted from the light source according to an image signal by a light modulation element, and expands and projects modulated light representing a modulated image. . There are a plurality of heat generating parts inside such a projector. Specifically, a discharge lamp as a light source, a lamp driving unit that turns on the discharge type lamp and maintains the lighting state, a light modulation element such as a transmissive liquid crystal light valve, a power source unit that supplies power to each part of the projector, etc. It is.
The projector includes a plurality of cooling fans that air-cool these heat generating portions and an exhaust section that includes an exhaust fan for exhausting air that has deprived the heat of the heat generating portions (hereinafter referred to as “hot air”). The exhaust part is provided on the rear surface of the projector body, and the exhaust direction is fixed in a fixed direction.

In addition, the projector is generally installed in either a “right position” or “ceiling” mode. “Orientation” refers to installing the projector on the ground side such as on a desk, and in this case, the projector projects an image looking up at the screen installed on the wall from the desk. In the normal position, the lower surface of the projector faces the ground side. In addition, the projection optical system of the projector is an “aori optical system” in order to project a substantially rectangular image onto a screen at an elevation angle from the normal position. In the following description, it is assumed that the projector has a flat and substantially rectangular parallelepiped shape, an operation panel including operation buttons and the like is provided on the upper surface, and legs for installation are provided on the lower surface.
“Ceiling” is an installation mode in which the projector is installed on the ceiling with a dedicated installation tool or the like. In this case, the projector is installed in such a manner that the upper surface is directed to the ground side and the wall screen is looked down. This is because the projection optical system of the projector is an optical system,
This is because the operation panel is provided on the upper surface.

FIG. 7 is a sectional side view of a conventional projector suspended from a ceiling. FIG. 8 is a schematic diagram of a conventional projector having a different aspect.
In the case of ceiling suspension, the projector body is inverted, so the temperature distribution of air inside the projector and the exhaust direction of the exhaust unit are also inverted. For this reason, the technique which adjusts a cooling mode according to the change of an installation mode is proposed. For example, the projector 200 of Patent Document 1 shown in FIG.
Are provided with mechanisms 202 and 203 for moving the exhaust duct 201 of the exhaust unit 205 to the hot air side inside the projector according to the installation mode.
Further, the projector 210 of Patent Document 2 shown in FIG. 8 includes an external bellows-like exhaust duct 211 as a movable exhaust duct.
Further, when the projector is suspended from the ceiling, it is necessary to reverse the direction of the image projected on the screen. This is because the projected image is also reversed as the projector body is reversed by the ceiling. The inversion of the projected image is performed by software, and is performed by selecting the ceiling from the menu on the installation mode setting screen displayed on the projected image.

JP 2004-185977 A JP 9-319007 A

However, although the projector 200 copes with the temperature change inside the projector due to the ceiling suspension, the exhaust direction is not taken into consideration.
Although there is no detailed description in Patent Document 1, it can be inferred from the text and the drawings that the exhaust direction of the projector 200 is directed to the lower side of the side, which is the same direction in both the upright position and the suspended state. This configuration was difficult to follow the natural providence of hot air. For this reason, even if the hot air inside the projector is guided by adjusting the exhaust duct 201, it cannot be said that the exhaust efficiency is good.
Moreover, in the projector 210 of patent document 2, the rugged exhaust duct 211 protrudes in the external appearance, and it was difficult to say that it was refined as a product. Further, since the exhaust duct 211 protrudes greatly to the outside, it is easy to come into contact with the exhaust duct when being carried or installed, causing a failure.

FIG. 9 is a diagram showing an installation mode setting screen when a conventional projector is suspended from the ceiling.
Further, when both the projectors 200 and 210 are suspended from the ceiling, it is necessary to select the ceiling from the installation mode setting screen as described above. However, when the projector is suspended from the ceiling, the setting screen 215 is inverted as shown in FIG. 9, so the operation menu must be read or a desired item must be selected on the setting screen 215 that is highlighted. It was.
This operation is not only difficult to read due to the reversal of characters, but also the left / right movement operation of the cursor by a remote control or the like is reversed, which is very troublesome.
As described above, the conventional projectors 200 and 210 have a problem that the switching operation for adjusting the direction of the projected image to the installation mode is troublesome. Further, the projector 200 has a problem that it is difficult to optimize the exhaust direction according to the installation mode. Also,
The projector 210 has a problem that its external appearance is rugged and its design completeness is low.

In order to solve the above problems, an object of the present invention is to provide a projector that can change the exhaust direction according to the installation mode and can easily adjust the direction of the projection image to the installation mode.

In order to achieve the above-described object, a projector of the present invention includes a light source, a light modulation element that modulates a light beam emitted from the light source to form an optical image, a projection unit that projects the formed optical image, A projector including an exterior casing that houses the light source, the light modulation element, and the projection unit therein, the exhaust section having an exhaust port for exhausting hot air inside the exterior casing, and the lower surface on the ground side Change means for directing the exhaust port to the ceiling side according to a plurality of installation modes, including an upright installation with the ceiling facing up and a ceiling suspension with the upper surface facing the ground side, and interlocking with the change means And an image switching means for changing the orientation of the image. The image switching means changes the orientation of the image according to the switching signal from the switch means. It is characterized by that.

According to this configuration, the projector includes the changing unit that directs the direction of the exhaust port toward the ceiling according to a plurality of installation modes, and the switch unit that outputs a switching signal indicating the installation mode in conjunction with the changing unit. Therefore, no matter which installation mode is selected, the direction of the exhaust port can be directed to the ceiling side by the changing unit, and the switch unit outputs a switching signal indicating the selected installation mode.
Therefore, unlike the conventional projector in which the exhaust direction is constant regardless of the installation mode, the projector of the present invention can direct the direction of the exhaust port to the ceiling side by the changing means regardless of the installation mode selected. it can.
Thereby, the hot air rising by natural convection can be efficiently exhausted from the exhaust port facing the ceiling.

Further, the image switching unit changes the orientation of the image according to the switching signal from the switch unit. Therefore, unlike conventional projectors, which require troublesome switching operations for adjusting the orientation of the projected image to the installation mode, the projector according to the present invention automatically switches the image switching means by the switching signal of the switch means in conjunction with the changing means. Change the direction of the projected image.
Therefore, the orientation of the projected image can be easily adjusted to the installation mode.
Therefore, it is possible to provide a projector that can change the exhaust direction according to the installation mode and can easily adjust the direction of the projection image to the installation mode.

According to the projector of the present invention, the changing means includes: an exhaust opening provided in the exterior housing; and an exhaust part that joins the exhaust part so as to be rotatable with a circular opening as a bearing. It is an integrated joint part, and the exhaust part has a substantially hexahedron including surfaces corresponding to the upper surface and the lower surface, and rotates around the tubular joint part as one of the surfaces corresponding to the upper surface and the lower surface. It is preferable to provide an exhaust port.

The upper surface and the lower surface are opposing surfaces. In addition, since the lower surface faces the ground side in the normal installation and the upper surface faces the ground side in the ceiling hanging, the ceiling side surface of the projector in the vertical installation becomes the upper surface, and the ceiling side surface of the projector in the ceiling hanging Is the underside.
According to this configuration, the exhaust part rotates about the tubular joint part as an axis, and has an exhaust port on either the upper surface or the surface corresponding to the lower surface. Therefore, since the exhaust port can be arranged on the upper surface side or the lower surface side of the projector by the rotation of the exhaust unit, an opening is formed on the surface on the ceiling side regardless of whether it is installed in a normal position or on a ceiling. Can be arranged.
Therefore, it is possible to provide a projector that can change the exhaust direction according to the installation mode.

According to the projector of the present invention, it is preferable that the exhaust unit incorporates an exhaust fan that introduces hot air from the joint unit and blows air to the exhaust port, and the exhaust fan is preferably disposed facing the exhaust port.

According to this configuration, since the exhaust fan is arranged facing the exhaust port, the hot air rising to the exhaust port side facing the ceiling side by natural convection can be efficiently exhausted by the exhaust fan. it can.
Therefore, since the cooling efficiency is good, the operation of the projector is stabilized.
Therefore, a projector with stable operation can be provided.

According to the projector of the present invention, the exterior casing has a substantially hexahedron shape including the upper surface and the lower surface, and the exhaust portion is located at an end portion on the side different from the projection portion on the surface where the projection portion of the exterior casing is disposed. Provided,
In a state where the exhaust port is arranged on the upper surface side or the lower surface side, it is preferable that the exhaust port is substantially contained in a hexahedron formed by each surface of the exterior housing.

According to this configuration, the exhaust part is substantially accommodated in the hexahedron formed by each surface of the exterior housing in a state where the exhaust port is disposed on the upper surface side or the lower surface side.
Therefore, unlike the conventional projector in which the exhaust duct protrudes greatly outside the projector, the projector of the present invention can realize a refined design with an increased sense of unity.
Further, in the upright and ceiling-mounted installation modes, the exhaust part is substantially contained in the six-faced body that constitutes the external appearance of the projector, so that the exhaust part does not get in the way when being carried or installed.
Accordingly, it is possible to provide a refined and highly designed projector.

According to the projector of the present invention, a click mechanism for stopping with a click feeling is provided in the vicinity of the opening of the exterior housing and the exhaust portion in a state where the exhaust port is disposed on the upper surface side or the lower surface side. At the same time, it is preferable that the exhaust surface and the exterior surface of the exterior housing have a display indicating the set state of the exhaust portion in the installation mode including at least the normal placement and the ceiling suspension.

According to this configuration, the click mechanism for stopping with a click feeling is provided in the vicinity of the opening of the outer casing and the exhaust portion in a state where the exhaust port is disposed on the upper surface side or the lower surface side. When the exhaust part is turned and set to the normal position or the ceiling-suspended mode, the alignment can be easily performed.
Further, on the exterior surface of the exhaust part and the exterior housing, a display showing a set state including at least the normal placement and the ceiling suspension is made. Therefore, even a beginner can easily align the exhaust part with the installation position of the upright or ceiling suspension mode by the display indicating the setting state.
Therefore, it is possible to provide a projector that can easily change the exhaust direction according to the installation mode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
<Projector overview>
FIG. 1A is a perspective view of a projector according to an embodiment of the present invention. FIG.1 (b) is a perspective view of the exhaust part periphery in a ceiling suspension. Here, an outline of the projector 100 will be described with reference to FIGS.
The projector 100 uses a discharge lamp such as a high-pressure mercury lamp or a metal halide lamp as a light source, modulates light emitted from the light source according to an image signal by a light modulation element, and transmits modulated light representing a modulated image from the projection unit 50. It is an optical device that magnifies and projects.

FIG. 1A shows a state where the projector 100 is placed upright.
Projector 100 has a flat, substantially rectangular outer casing (hereinafter referred to as “exterior case”) including front surface Sf, upper surface Su, lower surface Sd, rear surface Sb, and side surfaces Sr and Sl. The projector 100 is installed in two ways: a normal position in which the lower surface Sd is directed to the ground side, and a ceiling suspension in which the upper surface Su is directed to the ground side.
The front surface Sf is provided with a projection unit 50 and an exhaust unit 40 at an end on a different side from the projection unit.
The upper surface Su is a surface on the ceiling side when the projector 100 is placed upright. An operation unit 56 having a plurality of operation buttons such as a power button is provided on the upper surface Su.
The lower surface Sd is a surface opposed to the upper surface Su, and becomes a surface on the ground side in normal placement. Lower surface Sd
Are provided with a plurality of leg portions which become legs when placed upright, and connection portions (none of which are shown) for connection to a ceiling suspension device when suspended from the ceiling.

The exhaust part 40 includes surfaces corresponding to the front surface Sf, the upper surface Su, the lower surface Sd, and the side surface Sr,
It is almost rectangular. A grid-like discharge port 41 for discharging hot air is provided on a surface corresponding to the upper surface Su of the exhaust unit 40. Further, in this state, the exhaust part 40 is within a plane obtained by extending the front surface Sf, the upper surface Su, the lower surface Sd, and the side surface Sr. The discharge port 41 may be configured to be provided on either one of the surfaces corresponding to the upper surface Su or the lower surface Sd. However, if the discharge port 41 is provided on the lower surface Sd side, it is necessary to reverse the arrangement of the display described below. There is.
In the vicinity of the exhaust unit 40 on the upper surface Su of the projector 100, “installation mode” and “▽” displays for confirming the setting state of the installation mode are printed. In addition, on the surface corresponding to the upper surface Su of the exhaust unit 40, characters “placed” indicating the setting state of the installation mode are printed. The position of the “normally placed” character is the position indicated by the “▽” display.
The display such as “installation mode” may be any display that can be identified, and may be a method of displaying on the exterior case surface by engraved characters engraved in the mold. Or
A method of sticking a seal may be used.

Although detailed description will be given later, the exhaust part 40 is provided so as to be able to turn in the direction of the arrow g.
FIG.1 (b) has shown the state which set the exhaust part 40 to the ceiling suspension mode. In order to set the exhaust part 40 to the ceiling suspension mode, the exhaust part 40 is turned 180 ° from the state of FIG.
In this state, the discharge port 41 faces the lower surface Sd. Further, the character “Ceiling” of the exhaust part 40 is displayed at the position indicated by the “▽” display on the upper surface Su.
Also in this state, the exhaust part 40 is within the plane obtained by extending the front surface Sf, the upper surface Su, the lower surface Sd, and the side surface Sr.
The exhaust unit 40 can be rotated in the direction of the arrow g without limitation, but when the “in-place” or “ceiling” display is arranged at the position indicated by the “▽” display, the click feeling “click” is given. It stops with it. This is realized by a “click mechanism” described later.

<Schematic configuration of projector>
FIG. 2 is a schematic configuration diagram of the projector. Here, with reference to FIG. 2 as appropriate, FIG.
A schematic configuration of the projector 100 will be described with reference to FIG.
The projector 100 includes liquid crystal light valves 23R, 23 for each color light as light modulation elements.
This is a so-called “liquid crystal three-plate projector” equipped with G and 23B. The liquid crystal light valves 23R, 23G, and 23B, which are transmissive liquid crystal panels, are provided for red light, green light, and blue light, respectively, and include a plurality of pixels corresponding to the resolution. Liquid crystal light valve 23
R, 23G, and 23B are included in the configuration of the optical unit 35.

The projector 100 includes a light source unit 5, an optical unit 35, a power supply unit 37, and a lamp driving unit 38.
, Projection unit 50, control unit 51, image signal processing unit 52, liquid crystal panel drive unit 53, storage unit 54,
Operation unit 56, remote controller 57, operation receiving unit 58, cooling fans F1 to F4, fan driving unit 6
0, an exhaust unit 40, a switch SW, and the like.
The light source unit 5 as a light source includes a discharge lamp 1 such as a high-pressure mercury lamp or a metal halide lamp, and a reflector 3 that collects light emitted from the discharge lamp 1 and emits the light toward the optical unit. In addition, the light source unit 5 includes the discharge lamp 1 that generates heat when the light source is turned on.

The optical unit 35 divides the light emitted from the light source unit 5 into a plurality of partial luminous fluxes, and uniform illumination optical system that equalizes the in-plane illuminance of the illumination area, and light with a stable luminance distribution in the three primary colors of light. A color separation optical system that separates each color light component of red, green, and blue, a light modulation element that modulates each color light according to an image signal for each color light, and a full-color modulated light by combining the modulated color lights And a light modulation unit including a color synthesizing optical system. Although details of the optical unit 35 will be described later, the liquid crystal light valves 23R, 23G, and 23B in the optical unit 35 are described.
The light modulation unit 30 (FIG. 3) including the heat generation part. This is because the light from the light source unit 5 is irradiated on the part, and the light that is not light-modulated becomes heat.

The power source unit 37 guides AC power from the external power source 351 from the inlet,
Electric power stabilized by a process such as transformation, rectification, and smoothing by a DC conversion unit (none of which is shown) is supplied to each unit of the projector 100 including the lamp driving unit 38.
Moreover, the power supply part 37 is a heat_generation | fever part, and this is because the electric power which was not converted into an effective output voltage becomes heat | fever on the relationship of power conversion efficiency.
The lamp drive unit 38 includes an igniter circuit that generates a high voltage to turn on the discharge lamp 1 to form a discharge path, and a ballast circuit (not shown) for maintaining a stable lighting state after lighting. It is comprised including. The lamp driving unit 38 is also a heat generating part, like the power source unit 37.

The projection unit 50 includes a zoom lens, and expands the full-color modulated light emitted from the optical unit 35 to project a full-color image on the screen SC.
The control unit 51, which is a component part of the image switching unit, is a CPU (Central Processing Unit).
The projector 100 is controlled by exchanging signals with each unit including the liquid crystal panel driving unit 53 and the fan driving unit 60 via the bus line Bus. Further, a potential level that is a switching signal of the switch SW is input to a predetermined input port of the control unit 51 via the bus line Bus. When the switching signal level becomes “Hi”, the liquid crystal panel driving unit 53 receives the potential level. Then, an inversion signal for inverting the order of scanning driving is transmitted. The predetermined input port is pulled down by default.
The image switching means includes a control unit 50 and a liquid crystal panel driving unit 53 described later.

The image signal processing unit 52 includes an external image signal supply device 35 such as a personal computer.
An image converter that converts an image signal input from 0 to an analog signal into a digital signal, a scaler and a frame memory (both not shown), and the like are included.
The image signal processing unit 52 performs analog processing such as scaling after AD conversion of input analog RGB signals and analog image signals such as component signals by an image converter.
The image signal processing unit 52 converts the image represented by the image signal to R with the resolution of the image signal.
Each GB color light is written into the frame memory, and the liquid crystal light valves 23R, 23G, 23B
The image signal suitable for the liquid crystal light valve is generated by converting to a displayable resolution and reading the image. In addition, trapezoid correction processing for bringing the shape of the effective image projected on the screen SC closer to a rectangle is also performed in conjunction with scaling.

The liquid crystal panel driving unit 53, which is a component part of the image switching means, is a liquid crystal panel driver, and the image signal subjected to image processing and the timing signal are transmitted to the liquid crystal light valves 23R, 23G.
, 23B to scan the liquid crystal light valve. The scanning drive order in the initial setting is set so that the projected image on the screen when the projector 100 is placed in the normal direction is in the positive direction. When the liquid crystal panel driving unit 53 receives the inversion signal from the control unit 51, the liquid crystal panel driving unit 53 reverses the order of the scanning driving.
The storage unit 54 is configured by a non-volatile memory such as a mask ROM, flash memory, or FeRAM, for example. The storage unit 54 stores various programs for controlling the operation of the projector, such as an activation program that defines the order and contents for activating the projector 100, and accompanying data. The program includes an image switching program for transmitting an inversion signal to the liquid crystal panel driving unit 53 using the switching signal level of the switch SW as a trigger.

The operation unit 56 is provided on the upper surface Su of the projector 100, and the projector 100
Are provided with a plurality of operation buttons (not shown). The plurality of operation buttons include a “power button” for starting and shutting down the projector 100, a “menu button” for displaying various operation menus, and up, down, left and right for selecting a desired operation from the operation menu. A “direction key” that can be selected and a “decision button” for executing the selected operation are included.
The remote controller 57 is a remote controller for remotely operating the projector 100, and the operation unit 5
6 is provided with a plurality of operation buttons for operating the projector 100 as in FIG.
When the operation receiving unit 58 is operated on the operation unit 56 or the remote controller 57, the operation receiving unit 58 receives the operation and sends an operation signal serving as a trigger for various operations to the control unit 51.

As described above, the main heat generating parts in the projector 100 are the light source unit 5 and the light modulation unit 3.
0 (FIG. 3), a power supply unit 37, and a lamp driving unit 38. In the projector 100, the power supply unit 37 and the lamp driving unit 38 are regarded as one part, and a dedicated cooling fan F1 to F4 is provided for each part.
The cooling fan F <b> 1 is a sirocco fan for cooling the light source unit 5. Cooling fan F2
, F3 are sirocco fans for cooling the light modulation unit 30 of the light source unit 35. Note that the number of cooling fans of the light modulation unit 30 is not limited to two. For example, 1
A configuration with one fan may be used, or three fans corresponding to each of the liquid crystal light valves 23R, 23G, and 23B may be provided.
The cooling fan F4 is an axial fan for setting the power source unit 37 and the lamp driving unit 38 as a set and cooling both the units with air.

The fan driving unit 60 is attached to the cooling fans F1 to F in accordance with a control signal from the control unit 51.
4 and the exhaust circuit F5 are driving circuits for rotationally driving each. The drive circuit includes, for example, a 5-channel DA converter with an output buffer operational amplifier and five 4-terminal regulators (all not shown) that generate a drive voltage corresponding to an adjustment voltage output for each channel of the DA converter. Composed. The DA converter outputs the corresponding adjustment voltage from each channel to each four-terminal regulator in accordance with the adjustment data defining the driving voltages for the cooling fans F1 to F4 and the exhaust fan F5 input from the control unit 51. Note that the configuration of the drive circuit is not limited to the above configuration. For example, a configuration using a DC / DC converter instead of the regulator may be used.
The exhaust unit 40 includes an exhaust fan F5. The exhaust fan F5 is an axial fan for exhausting the air (hereinafter referred to as “hot air”) from which the cooling fans F1 to F4 have blown and deprived the heat amount of each heat generating portion to the outside. The specific arrangement of the cooling fans F1 to F4 and the exhaust fan F5 will be described later.
The switch SW as the switch means is a single contact push switch provided on a surface corresponding to the back surface of the exhaust unit 40 in the exterior case of the projector 100. Switch SW
Is turned on when the protrusion 43 (FIG. 4) provided on the back surface of the exhaust unit 40 is arranged at the position of the switch. When the switch SW is turned on, the switching signal level becomes “Hi”.

<Outline of optical unit>
FIG. 3 is a schematic plan view mainly including an optical system and a cooling configuration in the projector of the present invention. Here, an optical system centered on the optical unit 35 of the projector 100 will be described with reference to FIG.
The optical unit 35 includes a uniform illumination optical system 10, a color separation optical system 14, a relay optical system 19, a light modulation unit 30, and the like.
The uniform illumination optical system 10 includes two fly-eye lenses 6, a polarization conversion element 7, a condenser lens 8, a reflection mirror 9, and the like.
The fly-eye lens 6 has a configuration in which small lenses having a substantially rectangular outline when viewed from the direction of the light source unit 5 are arranged in a matrix, and two pairs form a pair. Each pair of small lenses
The light beam emitted from the light source unit 5 is divided into partial light beams and emitted in the optical axis direction. A plurality of light source images emitted from the respective small lenses are superimposed on the image forming regions of the liquid crystal light valves 23R, 23G, and 23B through the condenser lens 8, respectively. Thereby, the luminance distribution on the image forming area of the liquid crystal light valves 23R, 23G, and 23B is made uniform.

The polarization conversion element 7 includes a PBS (Polarization Beam Splitter) array, a half-wave plate, and the like, and converts random polarization into specific linear polarization. Since the specific linearly polarized light is polarized light that can be incident on an incident polarizing plate (not shown) provided on the incident surface of each liquid crystal light valve, it cannot pass through the incident polarizing plate without the polarization conversion element 7. The light that has been wasted as heat can be used effectively.
The light emitted from the light source unit 5 passes through the two fly-eye lenses 6, the polarization conversion element 7, and the condenser lens 8, is reflected by the reflection mirror 9, and is emitted toward the color separation optical system 14. Note that another condenser lens may be provided after the reflection mirror 9.
In addition, the uniform illumination optical system 10 may be close to the light source unit 5 that is a heat source and emits a certain amount of heat.

The color separation optical system 14 includes a dichroic mirror 12 and a dichroic mirror 13.
The dichroic mirror 12 is an optical element in which a dichroic film having a property of reflecting R light on a glass plate or the like and transmitting B light and G light is formed, reflects the R light to the reflection mirror 15 side,
Transmits B light and G light. The R light reflected by the reflecting mirror 15 is collimated by the collimating lens 20 and enters the liquid crystal light valve 23R. B transmitted through the dichroic mirror 12
The light and the G light are incident on the dichroic mirror 13.
The dichroic mirror 13 is an optical element provided with a dichroic film that reflects G light and transmits B light. The dichroic mirror 13 reflects G light toward the liquid crystal light valve 23G and transmits B light. The G light reflected by the dichroic mirror 13 is collimated by the collimating lens 20 and enters the liquid crystal light valve 23G. The B light transmitted through the dichroic mirror 13 is relay optical system 1.
9 is incident.

The relay optical system 19 includes two relay lenses 17 and two reflection mirrors 18.
The B light transmitted through the dichroic mirror 13 passes through the relay lens 17 and is reflected by the reflection mirror 1.
8 and further reflected by the reflecting mirror 18 via the relay lens 17, then collimated by the collimating lens 20 and incident on the liquid crystal light valve 23 </ b> B. Two relay lenses 1
7 is provided to prevent attenuation of B light passing through the longest optical path among the separated three color lights.

The light modulation unit 30 is a liquid crystal light valve 23R, 23G, 23 for each color light which is a light modulation element.
B and a cross dichroic prism 29 which is a color synthesizing optical system.
The liquid crystal light valves 23R, 23G, and 23B are provided to face three surfaces of a cross dichroic prism 29 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 29. The outgoing polarizing plate may be configured to be attached in advance to each surface of the cross dichroic prism 29.
Although the polarization direction is aligned by the polarization conversion element 7, the incident polarizing plate on which light is incident substantially perpendicularly generates heat due to the light that could not be transmitted. Similarly, the liquid crystal light valve 23
Since heat is also generated in R, 23G, and 23B and the output polarizing plate, the light modulation unit 30 including the cross dichroic prism 29 in close contact with the output polarizing plate serves as a heat generating portion.
Each color light incident on the liquid crystal light valves 23R, 23G, and 23B is modulated into each color modulated light including an optical image for each color light, and is emitted into the cross dichroic prism 29, respectively.

The cross dichroic prism 29 has a structure in which four right angle prisms are bonded to each other, and a dichroic film 27 that is a dielectric multilayer film that transmits R light and G light and reflects B light therein, and G light and B light. A dichroic film 28 that is a dielectric multilayer film that transmits light and reflects R light is provided in an X shape.
The cross dichroic prism 29 transmits the green modulated light from the liquid crystal light valve 23G, and the red modulated light from the liquid crystal light valve 23R and the blue modulated light from the liquid crystal light valve 23B are transmitted to the green modulated light. The modulated light that is reflected and superimposed and includes a full-color image obtained by synthesizing the modulated light of the three primary colors is emitted to the projection unit 50.
The modulated light emitted from the cross dichroic prism 29 is enlarged and projected as a full-color image on a screen or the like by a projection unit 50 that is a wide-angle zoom lens in which a plurality of Gaussian lenses or the like are combined.

<Outline of cooling configuration>
Here, the cooling configuration of the projector 100 will be described with reference to FIG.
In addition, the solid line arrow in FIG. 3 indicates the flow path of the cooling air.
Cooling fans F <b> 1 to F <b> 4 are provided for each main heat generating part in projector 100. The main heat generating parts are the light source part 5, the light modulating part 30, the power source part 37 and the lamp driving part 38 as one set.
The cooling fan F1 is a sirocco fan provided on the lower surface Sd side (z-axis plus direction) of the uniform illumination optical system 10, and a dust-proof filter (none of which is shown) from an air inlet provided on the lower surface Sd of the projector 100. The air is sucked through the fly-eye lens 6 around the light source 5.
Further, the air is blown so that the cooling air is distributed in the vicinity of the polarization conversion element 7. In addition, the structure which sprays a wind directly toward the discharge lamp 1 inside the reflector 3 may be sufficient.
The cooling fans F <b> 2 and F <b> 3 are respectively arranged on the side surfaces of the projection unit 50 with the air blowing port facing the light modulation unit 30 side. The cooling fans F2 and F3 suck in air from the suction port of the lower surface Sd common to the cooling fan F1 and blow the cooling air so that the cooling air is distributed over the entire light modulation unit 30.
The cooling fans F <b> 1 to F <b> 3 cool each heat generating part by effectively using the space in the thickness direction (z-axis direction) of the projector 100. The hot air generated by cooling is the exhaust fan F.
5 is discharged from the exhaust unit 40 to the outside of the projector 100.

The cooling fan F4 is an axial fan, and cools with the power supply unit 37 and the lamp driving unit 38 provided adjacent to each other as a set.
Since the power supply unit 37 and the lamp driving unit 38 are mainly a circuit board (not shown) including a high voltage circuit such as a boost chopper circuit, the power source unit 37 and the lamp driving unit 38 are made of a metal material so that electromagnetic noise due to the high voltage does not leak to the outside. It is provided with a box-shaped casing that ensures shielding properties. The said housing | casing is provided in the net shape by the metal net | network or several slit, and becomes a structure which can introduce and discharge | emit the cooling air by the cooling fan F4 smoothly. The intake surface of the cooling fan F4 faces an intake port (not shown) provided in the rear surface Sb of the projector 100. Further, a filter for dust absorption (not shown) is provided at the intake port.
The cooling air blown by the cooling fan F4 absorbs the heat of the power supply unit 37 and the lamp driving unit 38, becomes hot air, is led to the exhaust fan F5 side, and is discharged from the exhaust unit 40 to the outside of the projector 100.
The exhaust unit 40 is assembled to the projector 100 by inserting a tubular joint unit 42 into an exhaust opening 105 provided in the exterior case of the projector 100.

<Exhaust section>
FIG. 4 is a perspective view showing how the exhaust part is assembled. FIG. 5A is a front view of a projector placed in a normal position. FIG. 5B is a cross-sectional view of the exhaust portion in the normal placement mode, and FIG.
It is sectional drawing of the switch periphery in a normal position aspect. FIG. 6A is a front view of a projector suspended from the ceiling. FIG. 6B is a cross-sectional view of the exhaust portion in the ceiling suspension mode, and FIG. 6C is a cross-sectional view of the periphery of the switch in the ceiling mode.
Here, using FIG. 4, FIG. 5 (a)-(c), and FIG. 6 (a)-(c), the exhaust part 4 is used.
A schematic configuration of 0 and an aspect of the exhaust unit 40 for each installation aspect will be described.

In FIG. 4, a tubular joint portion 42, a protruding portion 43, a click convex portion 44, and the like are provided on the back surface of the exhaust portion 40.
In addition, a circular opening 105 is formed on the joint surface of the projector 100 with the exhaust 40.
Click recesses 106 and 107 are provided. A switch button SWb protrudes from the bottom of the click recess 107.
The diameter of the joint portion 42 as the changing means is slightly smaller than the diameter of the opening 105,
The opening 105 is set as a bearing so that it can be smoothly turned without rattling.
The joint part 42 is integrated with the exterior member of the exhaust part 40, and when the joint part is inserted and assembled into the opening 105, the entire exhaust part 40 can rotate about the joint part.

Specifically, the joint part 42 inserted into the opening 105 is assembled by a metal C-ring so as not to come out of the opening and so as to be pivotable. The assembling method may be any method as long as the joint portion 42 does not come out of the opening 105 and the exhaust portion 40 can be turned smoothly. For example, a configuration may be adopted in which a male screw portion is provided at the outer peripheral end portion of the joint portion 42 and inserted into the opening portion 105 and then assembled from the inner wall side of the opening portion with a nut having a diameter larger than that of the opening portion.
Further, the corner of the outer peripheral surface including the exhaust port 41 in the rotation direction of the exhaust unit 40 is chamfered with a large arc so that it does not contact the exterior case surface of the projector 100 when the exhaust unit 40 rotates. Yes.

The click mechanism includes a click recess 1 on a joint surface with the exhaust unit 40 in the projector 100.
06, 107, a protrusion 43 on the back of the exhaust part 40, a click protrusion 44, and the like.
The click concave portions 106 and 107 have a semicircular concave shape provided on the joint surface. Although the radius of the concave shape is the same at the two locations, a hole penetrating the joint surface is provided at the bottom of the click concave portion 107. As shown in FIG. 5C, the button SWb of the switch SW attached to the inside of the joint surface is inserted into the through hole at the bottom of the click recess 107.
Returning to FIG. As a result, the button SWb of the switch is observed in a protruding state at the bottom of the click recess 107. The click recesses 106 and 107 are provided on the center line Ce extending in the horizontal direction from the center of the opening 105 on the joint surface and centered on a point equidistant from the center point of the opening 105. . That is, the click recesses 106 and 10
7 is provided on one concentric circle Ca in the opening 105.
The protrusion 43 and the click protrusion 44 of the exhaust part 40 are click recesses 106 and 107, respectively.
It is provided in the positional relationship corresponding to. Specifically, in a state where the joint portion 42 is assembled to the opening portion 105, the click convex portion 44 is engaged with the click concave portion 107 when the position of the protrusion 43 is aligned with the click concave portion 106. Further, the size of the protrusion 43 and the click protrusion 44 is set to fit in both the click recesses 106 and 107, respectively.

In this state, the exhaust port 41 is connected to the upper surface Su of the projector 100 as shown in FIG.
Look to the side. That is, the exhaust unit 40 is set to the normal mode.
Further, when the exhaust part 40 is turned by 180 ° from this state, the protrusion 43 is engaged with the click recess 107 and the click protrusion 44 is engaged with the click recess 106. At this time,"
The exhaust unit 40 stops with a click feeling. After the turn, as shown in FIG. 6A, the exhaust port 41 faces the lower surface Sd of the projector 100, that is, the exhaust unit 40 is set to the ceiling mode.
Thus, when the exhaust unit 40 is turned, the exhaust unit 40 stops with a click feeling in a state where the exhaust port 41 is arranged on the upper surface Su side or the lower surface Sd side by the click mechanism described above. However, the exhaust part 40 can be rotated indefinitely by applying a predetermined turning force for removing the protrusions fitted from the click recesses 106 and 107. The predetermined turning force is set to a force enough to start turning if a little force is applied manually, for example, about 0.2 Nm.

FIG. 5B shows a “bb” cross section in FIG. The exhaust fan F5 built in the exhaust part 40 is disposed facing the exhaust port 41.
The hot air inside the projector 100 placed upright rises from the joint part 42 toward the exhaust port 41 provided on the ceiling side by natural convection without forced exhaust. Further, the exhaust speed is accelerated by the exhaust fan F5 provided on the way of hot air rising.
FIG. 5C shows a cross-sectional shape of the click recess 107 in this state (“c−” in FIG. 5A).
c "cross section). The click convex portion 44 is engaged with the click concave portion 107.
The click convex portion 44 is a protruding portion of the exterior member of the exhaust portion 40 having a partial circumferential surface that is slightly smaller than the radius of the click concave portion 107 at the tip. The height of the protruding portion is set to a height that does not reach the button SWb of the switch SW. For this reason, since the switch SW remains in the off state and the switching signal level does not change, the projector 100 projects an initially set image that is in the normal direction in the normal position.

In FIG. 6A, the projector 100 is mounted on the lower surface S by the ceiling-mounted installation instrument 120.
It is suspended from the ceiling with d facing the ceiling. Moreover, the exhaust part 40 is set to the ceiling suspension mode.
FIG. 6B shows a “jj” cross section in FIG. The exhaust fan F5
Since it faces the exhaust port 41, it faces the ceiling side.
The hot air inside the projector 100 suspended from the ceiling rises from the joint part 42 toward the exhaust port 41 provided on the ceiling side by natural convection without forced exhaust. Further, the exhaust speed is accelerated by the exhaust fan F5 provided on the way of the hot air rising.
FIG. 6C shows the cross-sectional shape of the click recess 107 in this state (“k−” in FIG. 6A).
k "cross section). The protrusion 43 is fitted into the click recess 107.
The projecting portion 43 is a projecting portion of the exterior member of the exhaust portion 40, which has the same shape as the shape of the click projecting portion 44 as a base and further includes a ball-shaped projection 43 b at the tip portion. The height of the protrusion 43b is set to a height necessary for turning on the button SWb of the switch SW.
Accordingly, the switch SW is turned on and the switching signal level becomes “Hi”, so that the projector 100 projects an inverted image obtained by inverting the image in the normal position by 180 °.

For example, the protrusion 43b may be configured by using a metal ball such as stainless steel. In this case, a coil spring that pushes up the metal ball and a holding mechanism for preventing the metal ball from jumping out are provided in the protrusion 43.
According to this configuration, the switch SW is optimized by optimizing the pushing load of the coil spring.
The button SWb can be turned on, and the turning torque when the exhaust unit 40 is rotated can be reduced.

As described above, according to the present embodiment, the following effects can be obtained.
(1) In the plurality of installation modes, the exhaust unit 40 of the projector 100 can turn the exhaust port 41 toward the ceiling side by turning around the joint unit 42 that is a changing unit as a rotation axis.
Therefore, no matter which installation mode is selected, the direction of the exhaust port 41 can be directed to the ceiling side by adjusting the exhaust unit 40 to the installation mode, so the hot air inside the projector 100 is directed toward the ceiling side. The exhaust can be efficiently exhausted from the exhaust port 41.
The projector 100 further transmits a switch SW as a switch unit that outputs a switching signal indicating an installation mode as the exhaust unit 40 turns, and an inversion signal for inverting the order of scanning driving in accordance with the switching signal level. A control unit 51 as an image switching unit and a liquid crystal panel driving unit 53 that reverses the order of scanning driving when receiving an inversion signal are provided.
Therefore, in the projector 100, the image switching unit automatically changes the direction of the projection image using the switching signal of the switch unit linked with the changing unit as a trigger.
Therefore, the direction of the projected image can be easily adjusted to the installation mode.
Therefore, it is possible to provide the projector 100 that can change the exhaust direction according to the installation mode and can easily adjust the direction of the projection image to the installation mode.

(2) The exhaust unit 40 rotates about the tubular joint unit 42 as an axis, and includes an exhaust port 41 on a surface corresponding to the upper surface Su of the projector 100.
Therefore, since the exhaust port 41 can be disposed on the upper surface Su side or the lower surface Sd side of the projector 100 by the rotation of the exhaust unit 40, the ceiling side can be installed in any of the installation modes of the normal installation and the ceiling suspension. The exhaust port 41 can be arranged on the surface.
Therefore, it is possible to provide the projector 100 that can change the exhaust direction according to the installation mode.

(3) Since the exhaust fan F5 is arranged facing the exhaust port 41, the hot air rising toward the exhaust port 41 facing the ceiling side by natural convection can be efficiently exhausted.
Therefore, since the cooling efficiency is good, the operation of the projector 100 is stabilized. Further, since the exhaust fan F5 only needs to have a blowing performance for accelerating exhaust by natural convection, an inexpensive small fan can be used.
Therefore, it is possible to provide the projector 100 with stable operation.

(4) The exhaust unit 40 has the upper surface Su, the lower surface Sd, the front surface Sf, the rear surface Sb, and the side surface Sr of the projector 100 in a state where the exhaust port 41 is disposed on the upper surface Su side or the lower surface Sd side.
, S1 substantially fits within the hexahedron outer case surface.
Therefore, since the exhaust part 40 can be accommodated in the exterior case surface, it is possible to realize a refined design that enhances the sense of unity.
Moreover, since the exhaust part 40 is substantially contained in the exterior case surface of the projector 100 in the normal installation and the ceiling-mounted installation mode, the exhaust part 40 does not get in the way when being carried or installed.
Accordingly, it is possible to provide the projector 100 having a refined and highly designed design.

(5) When the switching signal level from the switch SW becomes “Hi”, the control unit 51 transmits an inversion signal for inverting the scanning drive order to the liquid crystal panel driving unit 53. When the liquid crystal panel driving unit 53 receives the inversion signal from the control unit 51, the liquid crystal panel driving unit 53 reverses the order of the scanning driving.
Therefore, when the exhaust port 41 is arranged on the lower surface Sd side and the exhaust unit 40 is set to the ceiling mode, the image is inverted by the liquid crystal panel driving unit 53 that has received the inversion signal.
Therefore, the projector 100 that can easily adjust the direction of the projected image to the installation mode.
Can be provided.

(6) The projector 100 includes click recesses 106 and 107 on the joint surface with the exhaust unit 40.
And a click mechanism including a protrusion 43 on the back surface of the exhaust unit 40, a click protrusion 44, and the like.
The click mechanism is a mechanism for stopping with a click feeling in a state where the exhaust port 41 is disposed on the upper surface Su side or the lower surface Sd side. Can be easily aligned.
Further, the exhaust unit 40 and the exterior surface of the projector 100 near the exhaust unit 40 on the upper surface Su are displayed with a setting state including at least a normal position and a ceiling suspension.
Therefore, even a beginner can easily adjust the exhaust unit 40 to the set position in the upright or ceiling suspension mode by the display indicating the set state.
Therefore, it is possible to provide the projector 100 that can easily change the exhaust direction according to the installation mode.

In addition, this invention is not limited to embodiment mentioned above. That is, the description of the shape, material, and the like described above is exemplary for ease of understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all part of is included in this invention.

(Modification 1)
This will be described with reference to FIGS. 1 and 4.
In the said embodiment, although the several installation aspect demonstrated as what is two installation aspects, a normal installation and a ceiling suspension, it is not limited to this. For example, as the installation mode of the projector 100, in addition to the normal installation and the ceiling suspension, the installation mode with the side surface Sr facing the ground side, and the side surface S
The present invention can be applied even in a case where l is directed to the ground side.
In this configuration, in addition to the click recesses 106 and 107, two click recesses are added on the concentric circle Ca. The centers of the two click recesses to be added are on the vertical line from the center point of the concentric circle Ca. In addition, a switch is built in the central portion of the two click recesses to be added, like the click recess 107. The two built-in switches are connected to different input ports of the control unit 51. When the projection 43 of the exhaust unit 40 is arranged in the corresponding click recess, the switch is turned on and the switching signal level to the input port is set. Change.
As a result, the exhaust unit 40 stops with a click feeling corresponding to one of the four installation modes each time it turns 90 °, and the setting of each installation mode becomes easy.
Further, the image switching means includes an image signal processing unit 52 in addition to the control unit 51 and the liquid crystal panel driving unit 53, and is set according to the switching signal level corresponding to each of the four installation modes. An image in a direction corresponding to the mode is generated.
According to this configuration, it is possible to provide the projector 100 that can change the exhaust direction according to the four installation modes and can easily adjust the direction of the projection image to the installation mode.

(Modification 2)
This will be described with reference to FIG. In the above-described embodiment, the projector 100 has been described as a liquid crystal three-plate projection projector using three transmissive liquid crystal light valves 23R, 23G, and 23B as light modulation elements. However, the present invention is not limited to this. The type of the light modulation element is not limited as long as it is a projection type projector corresponding to a plurality of installation modes.
For example, a projector having a single-plate liquid crystal light valve as a light modulation element, in which red, green, and blue color filters are regularly arranged in a grid pattern and can emit a full-color modulated light. May be. Alternatively, a projector using two or four or more liquid crystal light valves may be used. Further, the projector may include a reflective liquid crystal display device or a tilt mirror device as a light modulation element.
Even if it is these structures, the effect similar to the said embodiment and modification can be acquired.

(A) The perspective view of the projector in one Embodiment, (b) The perspective view of the exhaust part periphery in a ceiling suspension. 1 is a schematic configuration diagram of a projector. FIG. 2 is a schematic plan view mainly including an optical system and a cooling system. The perspective view which shows the assembly aspect of an exhaust part. 1A is a front view of a projector placed in a normal position, FIG. 2B is a cross-sectional view of an exhaust portion in a normal position, and FIG. (A) Front view of the projector suspended from the ceiling, (b) Cross sectional view of the exhaust part in the ceiling hanging mode, (c) Cross sectional view of the periphery of the switch in the ceiling hanging mode. The sectional side view in the ceiling suspension of the conventional projector. The schematic diagram of the projector of the different aspect of the past. The figure which shows the installation mode setting screen when the conventional projector is suspended from the ceiling.

Explanation of symbols

5 ... Light source part as a light source, 23R, 23G, 23B ... Liquid crystal light valve which is a transmissive liquid crystal panel as a light modulation element, 40 ... Exhaust part, 41 ... Exhaust port, 42 ... Joint part as changing means, 43 ... Projection, 43b ... Projection, 44 ... Click projection of click mechanism, 50 ...
Projection unit, 51... Control unit as image switching means, 53... Liquid crystal panel drive unit as image switching means, 100... Projector (external housing), 106, 107 ... click recess of click mechanism, F5. A switch as a switch means, Su, an upper surface, Sd, a lower surface, Sf, a front surface, Sb, a rear surface, Sr, Sl, a side surface.

Claims (5)

A light source, a light modulation element that modulates a light beam emitted from the light source to form an optical image, a projection unit that projects the formed optical image, and the light source, the light modulation element, and the projection unit inside A projector having an exterior housing to be housed in
An exhaust part having an exhaust port for exhausting hot air inside the exterior casing;
The direction of the exhaust port according to a plurality of installation modes, including a normal installation in which the lower surface of the outer casing is installed toward the ground side, and a ceiling suspension in which the upper surface of the outer casing is installed toward the ground side Change means for directing the ceiling toward the ceiling,
In association with the change means, switch means for outputting a switching signal indicating the installation mode;
Image switching means for changing the orientation of the image,
The projector according to claim 1, wherein the image switching unit changes a direction of the image in accordance with a switching signal from the switch unit. The changing means is integrated with the exhaust portion that is pivotably joined using the circular opening portion as a bearing for joining the exhaust opening portion provided in the exterior casing and the exhaust portion. Joint part,
The exhaust portion has a substantially hexahedron shape including surfaces corresponding to the upper surface and the lower surface, rotates around the tubular joint portion, and the exhaust port is provided on either the upper surface or the surface corresponding to the lower surface. The projector according to claim 1, comprising: a projector. 3. The exhaust unit includes an exhaust fan that guides hot air from the joint unit and blows air to the exhaust port, and the exhaust fan is disposed facing the exhaust port.
Projector. The exterior housing has a substantially hexahedron including the upper surface and the lower surface,
In the state where the exhaust portion is provided at an end portion on the side different from the projection portion on the surface of the exterior housing where the projection portion is disposed, and the exhaust port is arranged on the upper surface side or the lower surface side. The projector according to claim 2, wherein the projector is substantially contained within a hexahedron composed of each surface of the exterior casing. In the vicinity of the opening and the exhaust part of the exterior housing, a click mechanism for stopping with a click feeling is provided in a state where the exhaust port is arranged on the upper surface side or the lower surface side,
The display showing the set state of the exhaust part in an installation mode including at least the normal placement and the ceiling suspension is made on the exhaust part and the exterior surface of the exterior casing. 5. The projector according to any one of 4.