JPH08201917A - Projector device - Google Patents

Abstract

(57) [Summary] [Object] To provide a projector device capable of reducing maintenance work for an air filter for removing dust and the like from the outside air taken in for cooling. [Structure] The flow of outside air that reduces the rise in internal temperature is reversed to scatter dust adhering to the air filter 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and is applied to a cooling system of a projector device for projecting an image on a screen to simplify maintenance work of an air filter.

[0002]

2. Description of the Related Art Conventionally, there is a projector device which projects an image transmitted through a liquid crystal display panel onto a screen to display an image. In such a projector device, the brightness of the display image is improved by increasing the light amount of the light source and increasing the transmitted light amount of the liquid crystal display panel.

That is, this type of projector device forms illumination light by a light source such as a metal halide lamp, and decomposes this illumination light into red, green, and blue illumination light. Furthermore, this type of projector device has red, green,
The liquid crystal display panel is driven by the blue color signal, and the red, green, and blue illumination light is transmitted to each liquid crystal display panel.

Further, this type of projector device synthesizes the transmitted light of these liquid crystal display panels and then projects it on a screen by a projection lens to form a color display image. As a result, this type of projector device increases the amount of illumination light and increases the amount of transmitted light of each liquid crystal display panel.
The brightness of the display image can be improved.

Further, in forming a display image in this manner, the projector apparatus of this type drives a fan to reduce the temperature rise of the light source and the liquid crystal display panel, which causes the temperature rise of the components of this type. The characteristic deterioration is effectively avoided and the brightness of the display image is maintained.

[0006]

When the outside air is introduced to cool the light source and the liquid crystal display panel as described above, dust or the like may adhere to the liquid crystal display panel. The dust and the like adhering to the liquid crystal display panel is enlarged and projected on the screen to make the displayed image unpleasant. For this reason, this type of projector device is configured to introduce outside air through an air filter to effectively prevent dust and the like from entering the inside.

However, this type of air filter has a drawback that it is clogged with dust or the like when it is used for a long period of time. When the air filter is clogged in this way, the projector device reduces the amount of outside air introduced by that amount,
The cooling efficiency will decrease.

Therefore, in this type of projector device, it is necessary to periodically perform maintenance work to clean and replace the air filter. In particular, in this type of projector device, since it is used in various environments, it is necessary to frequently perform maintenance work of the air filter in an environment with a lot of dust.

If the maintenance work of this kind can be reduced, the usability of the projector apparatus of this kind can be further improved.

The present invention has been made in consideration of the above points, and an object thereof is to propose a projector device capable of reducing the maintenance work of an air filter for removing dust and the like.

[0011]

In order to solve such a problem, in the present invention, in a projector device that drives a light source to display an image on a predetermined screen, the outside air is introduced to reduce the increase in the internal temperature. Introducing means, an air filter for removing dust from the outside air, and a control means for controlling the operation of the outside air introducing means, the control means switches the operation of the outside air introducing means at a prescribed timing, Reverses the flow of outside air to scatter dust adhering to the air filter.

Further, at this time, when the power source is turned on, the control means turns on the light source after reversing the previous flow of outside air for a prescribed period.

[0013]

In a projector device provided with outside air introducing means for introducing outside air to reduce an increase in internal temperature, an air filter for removing dust from the outside air, and control means for controlling the operation of the outside air introducing means. If the control means switches the operation of the outside air introducing means at a specified timing and reverses the flow of the outside air to scatter dust adhering to the air filter, the clogging of the air filter can be reduced accordingly. .

Further, at this time, when the power is turned on, the control means reverses the flow of the outside air for a predetermined period and then turns on the light source, so that the air filter is periodically turned on immediately after the power is turned on. Dust adhered to can be scattered.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a top view showing a cross section of a projector device according to an embodiment of the present invention from the top surface side.
The liquid crystal projector device 1 is obliquely inclined and fixedly installed on a ceiling or the like, and in this state, an image is projected on a screen arranged on the front side of the liquid crystal projector device 1 on the right side in the drawing.

Here, the liquid crystal projector device 1 is entirely covered with a cover, and a chassis box 2 forming a housing is arranged inside the cover. The chassis box 2 holds a projection lens 3 on the front side, holds an optical block 4 behind the projection lens 3, and further holds a lamp block 5 behind the optical block 4.

The lamp block 5 holds a lamp 6 made of a metal halide lamp in a housing case 8 together with a reflecting mirror 7 of the lamp 6, and supplies illumination light from the lamp 6 to the optical block 4. Further, the lamp block 5 holds the storage case 8 in a replaceable manner with respect to the optical block 4, so that in the liquid crystal projector device 1, the characteristics of the lamp 6 are deteriorated, and the illumination light emitted to the optical block 4 is blocked. When the amount of light decreases, the storage case 8 can be removed from the optical block 4 and the lamp 6 can be replaced.

Further, as shown in FIG. 1, in the lamp block 5, the housing case 8 is formed with a plurality of through holes so that the air in the lamp block 5 circulates with the air in the chassis box 2. Has been done.

An exhaust fan 10 is arranged above the lamp block 5, and the exhaust fan 10 exhausts the air in the lamp block 5 upwards as shown by an arrow a so that the inside of the lamp block 5 is exhausted. The air is forcibly exchanged with the air in the chassis box 2. As a result, in the liquid crystal projector device 1, the exhaust fan 10
The temperature rise in the lamp block 5 is thereby reduced, and the characteristic deterioration due to the temperature rise of the lamp 6 is reduced.

On the other hand, the optical block 4 (FIG. 2) is
A condenser lens 13 is arranged on the lamp block 5 side, and the illumination light L1 incident from the lamp block 5 is condensed by the condenser lens 13. Further, in the optical block 4, a color separation optical system 14 is arranged on the exit surface side of the condenser lens 13,
The color separation optical system 14 separates the illumination light of white light into red, blue and green illumination light.

That is, the color separation optical system 14 separates and reflects the first dichroic mirror that separates and reflects the blue lighting light LB from the lighting light L1 and the green lighting light LG from the light emitted from the first dichroic mirror. The second dichroic mirror and the second dichroic mirror are sequentially arranged on the optical path of the illumination light.

The optical block 4 includes liquid crystal display panels 16, 17 and 18 which are driven by blue, green and red image signals on the optical paths of the blue, green and red illumination lights LB, LG and LR, respectively. , A combined optical system 19 for continuing the transmitted light of these liquid crystal display panels 16, 17 and 18.
To synthesize. The optical block 4 bends the optical path of the blue, green, and red illumination light LB, LG, and LR by the mirror 20 so that the blue illumination light LB is parallel to the optical path of the illumination light L1. After that, the liquid crystal display panel 16 is made to pass therethrough, whereby the overall shape is made smaller.

Further, in this embodiment, in the liquid crystal display panels 16, 17 and 18, the polarization filters on the incident side of the illumination light are arranged separately from the panel body, so that the temperature rise of the polarization filters is directly caused by the panel body. It is designed so that it does not conduct to. In addition to the polarization filters arranged apart from each other, in this embodiment, polarization filters are arranged in the color separation optical system 14, and the illumination light LB, LG, LR incident on the panel body by these polarization filters.
Is set to be a linearly polarized wave, which also reduces the temperature rise of the panel body.

The synthesizing optical system 19 includes a liquid crystal display panel 16,
It is formed by a half mirror or the like that synthesizes the transmitted lights of 17 and 18, and the synthesized image light is emitted to the projection lens 3. As a result, in the liquid crystal projector device 1, the projection lens 3
It is possible to display a color image by projecting image light.

When the liquid crystal display panels 16, 17 and 18 are held by the optical block 4 in this manner, the liquid crystal projector device 1 takes in the outside air from the front and left sides, and the taken outside air is taken into the optical block 4. From the upper side toward the lower side of the liquid crystal display panels 16, 17 and 18 to reduce the temperature rise of the liquid crystal display panels 16, 17 and 18.

That is, the front surface of the liquid crystal projector device 1,
An intake port 22 is formed on the left side, and a cooling fan 23 is arranged above the projection lens 3. A duct 24 for guiding the outside air taken in from the intake port 22 to the cooling fan 23 is formed for the cooling fan 23, and an air filter 25 is arranged between the duct 24 and the intake port 22. .

On the other hand, behind the cooling fan 23 (FIG. 1), a duct 26 extending rearward along the optical block 4 is formed, and in the middle of this duct 26, the liquid crystal display panels 16, 17 and 18 are provided. Above the liquid crystal display panel 16,
A blowout port 27 is formed toward 17 and 18.

On the other hand, below the liquid crystal display panels 16, 17 and 18, an exhaust port 28 is formed by bending rearward, and an air filter 25 is arranged at the tip of this exhaust port 28. ing. As a result, in the liquid crystal projector device 1, the air filters 25 and 29 are arranged on the intake side and the exhaust side, respectively, and the liquid crystal display panels 16 and 17 are provided when the outside air is taken in and when the intake is stopped and left. Adhesion of dust or the like to 18 is effectively avoided.

The cooling fan 23 is driven by the drive circuit 31 with respect to such an outside air circulation path, and the outside air taken in through the intake port 22 of the liquid crystal display panels 16, 17 and 18 is driven as indicated by an arrow b. The air is sent out upward, so that the outside air is discharged from the air outlet 27 to the liquid crystal display panels 16, 1
7 and 18 are sprayed to cool the liquid crystal display panels 16, 17 and 18.

As a result, in this embodiment, dust or the like adheres to the air filter 25, and it becomes necessary to regularly maintain the air filter 25.

The system control circuit 36 is formed by a microcomputer that controls the operation of the liquid crystal projector device 1 as a whole, and starts a timer 37 when the power is turned on. The timer 37 is realized by a time measuring function built in the microcomputer.

Further, the system control circuit 36 subsequently outputs control data to the drive circuit 31 to start the rotation of the fan 23. At this time, the system control circuit 36 starts the rotation of the fan 23 in the direction opposite to that during cooling, and as a result, as shown by the symbol c, an air flow in the direction opposite to that during normal cooling is applied to this outside air circulation path. Form. As a result, the system control circuit 36 blows out the air inside the housing toward the air filter 25 and scatters dust and the like adhering to the air filter 25.

As a result, in the air filter 25, clogging can be reduced, and the maintenance cycle for replacement and cleaning can be made significantly longer than in the conventional case. Therefore, in the liquid crystal projector device 1,
Therefore, maintenance work can be reduced. In particular, large dust such as cotton dust can be almost completely scattered by blowing air in this way, and the work itself such as cleaning can be simplified accordingly.

The system control circuit 36 monitors the timer 37 after thus starting the rotation of the fan 23, and switches the rotation direction of the fan 23 to the rotation direction at the time of cooling after a predetermined period elapses. Subsequently, the system control circuit 36 activates the fan 10, outputs control data to the lamp control circuit 38, and turns on the lamp 6.

Thus, in the liquid crystal projector device 1, the period immediately after the power is turned on is effectively used to regularly scatter dust and the like adhering to the air filter 25 to reduce the maintenance work of the air filter 25. ing.

In the above structure, the illumination light generated by the lamp 6 is passed through the condenser lens 13 to the color separation optical system 1.
At 4, the blue, green, and red illumination lights LB, LG, and LR are decomposed, and the illumination lights LB, LG, and LR pass through the liquid crystal display panels 16, 17 and 18, respectively, and then are combined by the combining optical system 19. , Is projected on the screen by the projection lens 3.

The lamp 6 is forcibly cooled by the fan 10 arranged above exhausts the air in the lamp block 5 upwards and replaces it with the air in the chassis box 2.

On the other hand, the liquid crystal display panels 16 and 17,
Reference numeral 18 denotes the outside air sucked through the air filter 25 from the front end and the left side of the liquid crystal projector device 1.
It is sprayed through the air outlet 27 and is forcibly cooled by this.

In this way, the liquid crystal display panels 16 and 1
When cooling 7, 7 and 18, at the time of startup, the rotation direction of the fan 23 that sucks in the outside air is set to the opposite direction, so that air is blown toward the outside toward the air filter 25, whereby the air filter 25. The dust and the like adhering to is scattered, and the air filter 25 is switched to the normal cooling operation in a clean state.

According to the above configuration, the fan 23 is activated at the time of startup.
By reversing the rotation of No. 2 and scattering dust or the like attached to the air filter 25, clogging of the air filter 25 can be reduced, and the maintenance work of the air filter can be reduced accordingly.

In the above embodiment, when the power is turned on, the rotation of the fan 23 is reversed to rotate the air filter 25.
Although the case where the dust and the like adhering to is scattered is described, the present invention is not limited to this, and for example, when the power switch is turned off, the rotation of the fan 23 may be reversed after waiting for the internal temperature to drop. Further, in this case, after the power switch is turned off, the fan 10 may be kept in the normal rotation direction to cool the lamp 6 after being turned off, and the rotation direction of only the fan 23 may be reversed.

In the above embodiment, the case where the light source and the liquid crystal display panel are individually cooled by the fans 10 and 23 has been described, but the present invention is not limited to this, and the case where one fan simultaneously cools. It can also be widely applied to

Further, in the above-mentioned embodiment, the case where the present invention is applied to a so-called three-plate type liquid crystal projector device has been described, but the present invention is not limited to this, and various projector devices such as a single-plate type liquid crystal projector device. Can be widely applied to.

[0045]

As described above, according to the present invention, the clogging of the air filter is reduced by reversing the flow of the outside air that reduces the rise in the internal temperature and scattering the dust adhering to the air filter. Therefore, maintenance work of the air filter can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a liquid crystal projector device according to an embodiment of the present invention.

FIG. 2 is a top view of FIG.

[Explanation of Codes] 1 Liquid crystal projector device 3 Projection lens 4 Optical block 5 Lamp block 6 Lamps 10, 23 Fan 31 Drive circuit 36 System control circuit 37 Timer

Claims (2)

[Claims] 1. A projector apparatus for driving a light source to display an image on a predetermined screen, wherein an outside air introducing unit that introduces outside air and reduces an increase in internal temperature; and an air filter that removes dust from the outside air. A control means for controlling the operation of the outside air introducing means, wherein the control means switches the operation of the outside air introducing means at a prescribed timing to reverse the flow of the outside air and scatter dust adhering to the air filter. A projector device characterized by the above. 2. The projector according to claim 1, wherein when the power is turned on, the control means turns on the light source after reversing the flow of the outside air for a prescribed period. apparatus.