JP2002372747A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which prevents the exhaust heat from an air exit from affecting the video light from a projection lens and improves an image grade when the same plane of a casing is provided with the projection lens and the air exit. SOLUTION: The projection type display device is provided with the projection lens and the air exit for an exhaust fan for cooling on the same plane of the casing and is provided with a freely openable and clossable partition plate (lens cover) between the projection lens of the casing and the air exit. When this partition plate is closed, the plate is used as a protective cover for the projection lens and when the partition plate is opened, the plate is used for preventing the interference of the video light from the projection lens and the exhaust heat from the air exit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device such as a liquid crystal projector, and more particularly to a projection type display device having a cooling device for cooling a light source and the like.

[0002]

2. Description of the Related Art Liquid crystal projectors have been widely used as projection display devices. This liquid crystal projector irradiates light from a light source to a transmissive liquid crystal panel and emits modulated light from the liquid crystal panel by driving the liquid crystal panel based on a television signal or an information signal from a personal computer or the like. The emitted light is projected on a screen via a projection lens, and an enlarged image is displayed.
As the light source, a high-voltage discharge lamp such as a halogen lamp, a xenon lamp, or a metal halide lamp is used to achieve high luminance.

Since the above-mentioned light source lamps generate heat when used and become high in temperature, it is necessary to suppress the radiant heat from the light source. It uses a fan for cooling. Further, in order to exhaust the heated air in the projector, an exhaust fan is mounted near the light source unit, and the air is exhausted to the outside through an exhaust port.

The above-mentioned exhaust port is often provided on the same surface as the surface on which the projection lens is provided, in order to prevent hot air from hitting the user. In other words, since the image from the projection lens is directed to the screen and there is no person in front of the screen, if the exhaust port is also provided on the projection lens side, the exhaust air will not hit the user and the exhaust The exhaust port is arranged on the same plane as the projection lens because of the advantage that sound is hard to hear.

However, when the exhaust port is arranged on the same plane as the projection lens, the exhaust heat from the exhaust port affects the image light from the projection lens, and the heat haze is reflected on the projection screen, thereby deteriorating the image quality. In addition, light from a light source lamp leaking from an exhaust port is reflected on a projection screen, causing a deterioration in contrast.

In order to suppress the occurrence of the above-mentioned heat haze, Japanese Patent Application Laid-Open
JP-A-90811 exemplifies a lamp in which an exhaust hole for cooling a lamp is provided on the same surface as a surface on which a projection lens is provided, and an exhaust direction is discharged in a direction which does not affect a projected image.

[0007]

As described above, when the exhaust port is arranged on the same surface as the projection lens, the heat of the exhaust from the exhaust port affects the image light from the projection lens, causing a heat haze, There is a drawback that light from the light source lamp leaking from the exhaust port is reflected on the projection screen. Further, even if the exhaust heat from the exhaust port is exhausted in a direction that does not affect the projected image, it is difficult to sufficiently prevent the heat haze, resulting in a decrease in image quality.

The present invention has been made in view of such circumstances. Even when the exhaust port is arranged on the same surface as the projection lens, heat rays are reflected on the image light or light from the light source lamp leaks from the exhaust port. Is to provide a projection-type image display device that is not reflected on a projection screen.

[0009]

According to the first aspect of the present invention,
In a projection display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface, between the projection lens and the exhaust port, the intensity of the projection light from the projection lens and the exhaust heat from the exhaust port is reduced. A partition plate for preventing interference is provided.

According to a fourth aspect of the present invention, there is provided a projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a casing, wherein a space between the projection lens and the exhaust port of the casing is provided. The hinge mechanism provided at the one end is coupled to the hinge mechanism, the other end is openable and closable with the hinge mechanism as a fulcrum, covers the projection lens when closed, and between the projection lens and the exhaust port when opened. And a lens cover for partitioning the space.

According to a fifth aspect of the present invention, there is provided a projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a housing, wherein a space between the projection lens and the exhaust port of the housing is provided. The hinge mechanism provided at the one end is coupled to the hinge mechanism, the other end is openable and closable with the hinge mechanism as a fulcrum, covers the projection lens when closed, and between the projection lens and the exhaust port when opened. It is characterized by comprising a lens cover for partitioning between the two, and an electric opening and closing means for opening and closing the lens cover.

According to a seventh aspect of the present invention, in the projection type display device wherein the projection lens and the exhaust port of the cooling exhaust fan are provided on the same surface of the housing, the space between the projection lens and the exhaust port of the housing is provided. The hinge mechanism provided at the, one end is coupled to the hinge mechanism, the other end is openable and closable about the rotation fulcrum, covers the exhaust port when closed, the projection lens and the exhaust port when open And a dust-proof cover that partitions between the two.

According to an eighth aspect of the present invention, in the projection display device wherein the projection lens and the exhaust port of the cooling exhaust fan are provided on the same surface of the housing, the space between the projection lens and the exhaust port of the housing is provided. The hinge mechanism provided at the one end, the one end is coupled to the hinge mechanism, the other end can be opened and closed with the hinge mechanism as a fulcrum, the exhaust port is closed when closed, and between the projection lens and the exhaust port when opened. It is characterized by comprising a dustproof cover for partitioning between the dustproof covers and an electric opening / closing means for opening and closing the dustproof cover.

According to a tenth aspect of the present invention, there is provided a light source provided in a housing, a liquid crystal panel irradiated with light from the light source, and a device for projecting transmitted light from the liquid crystal panel toward a screen. A projection lens provided on one side surface of the housing, and an exhaust port provided on one side surface of the housing provided with the projection lens for releasing heat from the light source to the outside; An air inlet provided on the other side of the housing, and a projection lens for preventing interference between projection light from the projection lens and exhaust heat from the exhaust port. And a partition plate provided between the exhaust port and the exhaust port.

In any of the inventions, a partition plate can be disposed between the projection lens and the exhaust port, and the partition plate allows the projection light from the projection lens and the exhaust heat from the exhaust port to be reduced. Interference can be prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below by taking a liquid crystal projector as an example.

FIG. 1 is a perspective view showing an external appearance of a projection type display device according to an embodiment of the present invention, and FIG. 2 is a plan view partially explaining a configuration of a main part.

In FIG. 1, 1 is a liquid crystal projector main body, 2 is a housing, 3 is a projection lens provided on the front of the housing, and 4 is an exhaust port also provided on the front of the housing. An operation unit 51 is provided on the upper surface of the housing 1 and a power switch 52 is provided on the front surface. In addition, the intake port 6 on the side
And a connection terminal 7 for connection to an external device, and a foot adjuster 8 is provided on the bottom surface of the housing.

A lens cover 9 is provided to protect the projection lens 3. The lens cover 9 covers the projection lens 3 to protect the lens surface when the projector is not in use, and is opened and exhausted when the projector is not in use. And projection lens 3
And a partition between them to function as a partition.

A hinge mechanism 91 is provided between the exhaust port 4 and the projection lens 3, and one end of the cover 9 is connected to the hinge mechanism 91.
And the other end can be opened at a predetermined angle (90 degrees to 120 degrees) with the hinge mechanism 91 as a fulcrum. Therefore, when the lens cover 9 is opened, the exhaust heat from the exhaust port 4 is blocked by the lens cover 9 and does not affect the light projected from the projection lens 3.

Next, the internal structure of the main body of the liquid crystal projector will be described with reference to FIG. Figure 2 shows R (red), G
An example of a three-panel liquid crystal projector having liquid crystal panels for (green) and B (blue) is shown.

In FIG. 2, reference numeral 10 denotes an optical box, and a lamp house 11 is provided near the box. The lamp house 11 includes a light emitting tube 1 as a light source.
A lamp 14 comprising a reflector 2 and a reflector 13 is arranged. Light from the arc tube 12 is reflected by a reflector 13 and unnecessary light such as infrared light and ultraviolet light is filtered by a filter 16.
After removal by the condenser lens 17 and the reflection mirror 18
Is supplied to the dichroic mirror 19 via the.

The dichroic mirror 19 is connected to the lamp 13
Are separated into R light and GB light, and the separated R light is reflected by a mirror 20 and radiated to a liquid crystal panel 22 for R via a field lens 21.

The GB light separated by the dichroic mirror 19 is split into G light and B light by a dichroic mirror 23, the G light is irradiated to a G liquid crystal panel 25 via a field lens 24, and the B light is relayed. Liquid crystal panel 3 for B through lens 26, reflection mirror 27, relay lens 28, reflection mirror 29 and relay lens 30
1 is irradiated.

Further, the R light, G light and B light transmitted through each of the liquid crystal panels 22, 25 and 31 are applied to the dichroic prism 3
2, and the combined image light is projected onto a screen (not shown) by the projection lens 3.

Thus, the R, G, B liquid crystal panels 22,
By driving 25, 31 with R, G, B primary color signals, a color image can be projected. Incidentally, polarizing plates are arranged on the incident side and the exit side of the liquid crystal panels 22, 25 and 31, respectively.

On the other hand, in the projection display device of the present invention, for example, fans 33 and 34 are used to cool the lamp 14, the liquid crystal panel, and the like. That is, a first fan 33 that introduces outside air from the intake port 6 and blows cooling air to the liquid crystal panels 22, 25, and 31, and a second fan that exhausts the wind blown to the lamp 3 to outside the projector. Two fans 34 are provided, and the air from the second fan 34 is exhausted from the exhaust port 4 to the outside. Note that the exhaust port 4
By providing the louvers 41 and the like, the discharged wind can be prevented from being directed toward the projection lens.

The fan for circulating the cooling air in the projector is not limited to the first and second fans 33 and 34, but may be provided in other parts, and may be provided on other side and bottom surfaces of the projector. May be. Although an air path is provided so that the cooling air from the blower fan flows smoothly through the heat generating portion, it is omitted in the figure.

The lamp 14 is provided with a ventilation hole (not shown) on the bottom surface of the reflector 13 and the like, and a plurality of holes 35 are provided in the support portion 15 for supporting the arc tube 12, and the lamp is introduced from the ventilation hole. The cooling air may be led out from the plurality of holes 35 and exhausted to the outside by the second fan 34.

Next, the lens cover 9 in the projection display device of the present invention will be described. One end of the lens cover 9 is connected to the hinge mechanism 91 and the other end is an open end, and a concave portion 92 is formed in the cover body so as to cover the projection lens 3. The hinge mechanism 91 is provided between the projection lens 3 and the exhaust port 4 of the housing 2, and the lens cover 9 can be opened and closed with the hinge mechanism 91 as a fulcrum, and the lens of the projection lens 3 when closed. The surface is protected, and in an open state, as shown in FIG. 1, functions as a partition plate between the projection lens 3 and the exhaust port 4.

When the projection angle from the projection lens 3 is considered, the lens cover 9 is opened more than 90 degrees, for example, about 120 degrees so as not to block the projected image. Thus, the exhaust heat from the second exhaust fan 34 is released to the side opposite to the projection lens 3 by the louver wall 41 and is not discharged to the projection lens 3 side by the lens cover 9. .

When the projector is not in use, the projection lens 3 can be covered so as to cover it, so that the lens surface of the projection lens can be protected. Note that a lock mechanism 93 may be provided at the open end and locked to the housing 2 so that the cover 9 is not opened unnecessarily when the lens cover 9 is closed.

As described above, in the present invention, the lens cover 9 is provided on the front surface of the housing 2, and when opened, the lens cover 9 functions as a partition plate between the exhaust port 4 and the projection lens 3. With such a structure, the exhaust heat from the exhaust port 4 does not affect the image light from the projection lens 3 and does not cause a heat haze phenomenon. The light from the light source lamp 13 leaking from the exhaust port 4 can also be blocked by the lens cover 9 and is not reflected on the projection screen. Therefore, it is possible to prevent a decrease in image quality.

Next, a second embodiment of the present invention will be described.
This will be described with reference to FIG. In the embodiment shown in FIG. 3, the lens cover 9 can be opened and closed electrically, and the motor 36 can be used to open and close the lens cover 9.
The motor 36 and the lens cover 9 are connected via a transmission mechanism 37. The motor 36 converts the rotational motion of the motor 36 into a linear motion and transmits the linear motion to the lens cover 9. The rotation of the motor 36 controls the lens cover 9 to be electrically driven. It opens and closes.

In this case, the operation section 51 (see FIG. 1)
A switch for opening and closing the lens cover 9 is provided, and the operation of this switch controls the rotation of the motor 36 to open and close the lens cover 9. Alternatively, the rotation of the motor 36 may be controlled to open and close the lens cover 9 in conjunction with the turning on and off of the power switch 52 of the projector.

By providing the motorized opening / closing means in the lens cover 9, the lens cover 9 can be opened / closed by a switch operation or opened when used in response to power supply operation of the projector and closed when not in use. Can be automatically operated.

The present invention is not limited to the above embodiment, but various embodiments can be considered. For example, as shown in FIG. 4, the lens cover 9 is provided with a hook 94 at one end so that the lens cover 9 can be attached to and detached from the housing 2 so as to cover the projection lens 3 when the projector is not used. 9 hook 94 to housing 2
The lens cover 9 may serve as a partition between the exhaust port 4 and the projection lens 3 in the inserted state (dotted line).

As shown in FIG. 5, instead of the lens cover 9, a dustproof cover 100 capable of closing the exhaust port 4 is provided.
When the projector is not in use, the dustproof cover 100
By closing the exhaust port 4, dust and dirt are prevented from entering the housing from the exhaust port 4, and when the projector is used, it is opened to partition between the exhaust port 4 and the projection lens 3 to function as a partition plate. You may do it. Further, similarly to the previous embodiment, the dustproof cover 100 may be opened and closed electrically.

[0039]

As described above, according to the present invention, in the present invention, when the air after cooling the light source unit and the like is discharged, the exhaust heat from the exhaust port 4 causes the image from the projection lens 3 to be discharged. Influence on light can be reduced, and there is an effect that light from the light source lamp 13 leaking from the exhaust port 4 is not reflected on the projection screen.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a projection display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the internal configuration of the projection display device of FIG.

FIG. 3 is an essential part cross-sectional view showing a projection type display device according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a main part of a projection display device according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a projection type display device according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projector 2 ... Housing 3 ... Projection lens 4 ... Exhaust port 6 ... Intake port 9 ... Lens cover 91 ... Hinge 100 ... Dustproof cover 36 ... Motor 37 ... Transmission mechanism

Claims (13)

[Claims] 1. A projection display device wherein a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface, wherein a projection light from the projection lens and an exhaust port are provided between the projection lens and the exhaust port. A projection display device, comprising a partition plate for preventing interference with exhaust heat of the display. 2. The partition plate separates the projection lens from the exhaust port when projecting light from the projection lens, and is used as a protective cover for the projection lens when the apparatus is not used. The projection type display device according to claim 1, wherein: 3. The partition plate separates between the projection lens and the exhaust port when projecting light from the projection lens, and is used as a dustproof cover for closing the exhaust port when the apparatus is not used. 2. The projection type display device according to claim 1, wherein: 4. A projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a housing, wherein a hinge mechanism is provided between the projection lens and the exhaust port of the housing. One end is connected to the hinge mechanism, and the other end is made openable and closable with the hinge mechanism as a fulcrum. When closed, the projection lens is covered, and when opened, the projection lens and the exhaust port are partitioned. A projection display device, comprising: a lens cover. 5. A projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a housing, wherein a hinge mechanism provided between the projection lens and the exhaust port of the housing. One end is connected to the hinge mechanism, and the other end is made openable and closable with the hinge mechanism as a fulcrum. When closed, the projection lens is covered, and when opened, the projection lens and the exhaust port are partitioned. A projection display device comprising: a lens cover; and an electric opening / closing unit for opening and closing the lens cover. 6. The motor-operated opening / closing means operates in conjunction with power-on / off of the apparatus, wherein the lens cover is opened when the power is turned on, and the lens cover is closed when the power is turned-off. The projection type display device as described in the above. 7. A projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a housing, wherein a hinge mechanism provided between the projection lens and the exhaust port of the housing. One end is coupled to the hinge mechanism, the other end is openable and closable about the pivot point, and covers the exhaust port when closed,
A projection display device comprising: a dust-proof cover that separates the projection lens and the exhaust port when opened. 8. A projection type display device in which a projection lens and an exhaust port of a cooling exhaust fan are provided on the same surface of a housing, wherein a hinge mechanism provided between the projection lens and the exhaust port of the housing. One end is connected to the hinge mechanism, and the other end is openable and closable with the hinge mechanism as a fulcrum. When closed, the exhaust port is covered, and when opened, the projection lens and the exhaust port are partitioned. A projection type display device comprising: a dustproof cover; and an electric opening / closing means for opening and closing the dustproof cover. 9. The apparatus according to claim 8, wherein the electric opening / closing means operates in conjunction with turning on / off of the power of the apparatus, and opens the dustproof cover when the power is on, and closes the dustproof cover when the power is off. The projection type display device as described in the above. 10. A light source provided in a housing, a liquid crystal panel irradiated with light from the light source, and one side surface of the housing for projecting transmitted light from the liquid crystal panel toward a screen. A projection lens provided in the, an exhaust port provided on one side surface of the housing provided with the projection lens to release heat from the light source to the outside, and cooling air in the housing. To take in, an intake port provided on the other side of the housing, and in order to prevent interference between projection light from the projection lens and exhaust heat from the exhaust port, between the projection lens and the exhaust port. A projection-type display device, comprising: a partition plate provided therebetween. 11. The partition plate separates the projection lens from the exhaust port when projecting light from the projection lens, and is used as a protective cover for the projection lens when the apparatus is not used. The projection type display device according to claim 10, wherein: 12. The partition plate separates between the projection lens and the exhaust port when projecting light from the projection lens, and is used as a dustproof cover for closing the exhaust port when the device is not used. The projection display device according to claim 10, wherein: 13. The projection type display device according to claim 10, further comprising an electric opening / closing means for opening / closing said partition plate.