JP3678062B2 - Projection display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display apparatus that projects an image obtained by irradiating light from a light source onto a light valve.
[0002]
[Prior art]
For example, the projection type display device uses a liquid crystal panel to form a light valve, separates white light emitted from the light source into three primary colors of red, blue and green, and then modulates the three liquid crystal panels based on the image signal. Then, after color-combining the modulated light, it is enlarged and projected by a projection lens and displayed on the screen.
[0003]
When the projection display device is classified according to the shape of the exterior cabinet, the projection display device 101 having a vertically long shape (hereinafter, referred to as a vertical type) in which the direction of separating and synthesizing the light emitted from the light source is the vertical direction (see FIG. 5-6) and a horizontally long (hereinafter referred to as horizontal) projection display device 201 (FIG. 7). In recent years, since the vertical length of the liquid crystal panel is shorter than the horizontal length, a vertical projection display device that can make the optical system for separating and synthesizing light emitted from a light source compact is a compact device. It is used to realize a reduction in weight and weight.
[0004]
The conventional vertical projection display device 101 shown in FIGS. 5 to 6 includes an optical system unit 2 and an axial fan as a cooling fan 3 for cooling the optical system unit 2 (hereinafter simply referred to as an axial fan 3). And an exterior cabinet (housing) 4 to which an optical system unit 2, an axial fan 3 and the like are attached.
[0005]
The optical system unit 2 includes a light source (lamp) 21, a fly-eye lens group 22, a PS conversion element 23, color separation mirrors (dichroic mirrors) 25 and 26, reflection mirrors 24, 27, 28, 29, 3 Three condensers 30R, 30G, and 30B, an incident side polarizing plate 36, liquid crystal panels 31R, 31G, and 31B, and an output side polarizing plate 37, and a light composition 35, a color composition cross prism (dichroic prism) 32, a projection lens 33, and a unit frame 34.
[0006]
The optical system unit 2 is disposed in the vertically long exterior cabinet 4 with the light source 21 side down and the light valve 35 side up.
[0007]
The PS conversion element 23 is formed by pasting together strip-shaped glass coated with a dielectric film with an adhesive. Further, on the incident side of the liquid crystal panels 31R, 31G, and 31B, an incident-side polarizing plate (polarizing film) 36 is bonded to the condenser lenses 30R, 30G, and 30B via thin glass plates, and the liquid crystal panel 31R. , 31G, 31B, polarizing plates 37 are bonded to the cross prism 32 via thin glass plates, respectively.
[0008]
The illumination light emitted from the light source 21 is made uniform by the fly-eye lens group 22 and the polarization direction is aligned by the PS conversion element 23, and then reflected by the reflection mirrors 24, 27, 28, 29 and the color separation mirrors 25, 26. , R (red), G (green), and B (blue).
[0009]
The light of each color irradiated to the liquid crystal panels 31R, 31G, and 31B through the condenser lenses 30R, 30G, and 30B and the polarizing plate 36 is modulated by the image signal, and the transmittance is controlled through the polarizing plate 37. The images formed on the liquid crystal panels 31R, 31G, and 31B in this manner are color-combined by the cross prism 32 and projected onto an external screen (not shown) by the projection lens 33.
[0010]
Next, a cooling means for suppressing a temperature rise that occurs when light passes through the polarizing plates 36 and 37 will be described. As shown in FIG. 6, one side surface 34 a of the unit frame 34 is provided with intake openings 38 R, 38 G, and 38 B facing the three liquid crystal panels 31 R, 31 G, and 31 B and the polarizing plates 36 and 37. In addition, exhaust openings 39R, 39G, and 39B are provided on the other side surface 34b of the unit frame 34 at positions facing the intake openings 38R, 38G, and 38B.
[0011]
The axial fan 3 is disposed substantially beside the cross prism 32 of the optical system unit 2, and has an intake port 4 a provided on the one side surface of the exterior cabinet 4 and an intake air intake provided in the unit frame 34. After the three liquid crystal panels 31R, 31G, and 31B and the polarizing plates 36 and 37 are sprayed through the openings 38R, 38G, and 38B, the exhaust openings 39R, 39G, and 39B provided in the unit frame 34 and the exterior cabinet are provided. 4 is discharged to the outside through an exhaust port 4b provided on the other side surface.
[0012]
[Problems to be solved by the invention]
In contrast to the vertical projection display device 101 described above, in the horizontal projection display device 201, as shown in FIG. 7, the axial fan 3 can be arranged at the lower part (bottom part). As a result, for example, when the air inlet 4a is provided on the bottom surface of the exterior cabinet 4 and the air outlet 4b is provided on the upper surface, the wind noise generated by the air intake is not directly heard by the operator or the audience. Fan noise is reduced. On the other hand, in the conventional vertical projection display device 101, as described above, in order to cool the incident side polarizing plate 36, the liquid crystal panels 31R, 31G, and 31B and the outgoing side polarizing plate 37, the axial flow is close to them. Since the fan 3 is disposed, the intake port 4a and the exhaust port 4b are provided on the side surface of the exterior cabinet 4 as shown in FIG. Therefore, when using a vertical projection display device placed on the table T or the like, the operator and the audience directly listen to the noise generated by the axial fan 3 from the intake port 4a and the exhaust port 4b. . Therefore, the vertical projection display device 101 has a problem that the noise level is increased as compared with the horizontal projection display device in which the axial fan 3 can be disposed on the bottom surface.
[0013]
Therefore, it is conceivable to arrange the axial fan 3 at the lower part (bottom part) in the vertically long exterior cabinet 4 with the axial fan 3, the intake port 4a, and the exhaust port 4b. However, as shown in the static pressure-air flow characteristic diagram of FIG. 8, the axial fan 3 is advantageous for obtaining the air flow but is not suitable for obtaining a large static pressure. For this reason, in order to send outside air (cooling air) to the light valve 35 at the upper position of the exterior cabinet 4 far from the axial flow fan 3 disposed in the lower part of the vertically long exterior cabinet 4, the axial flow fan 3. Therefore, the fan is forced to be used at a high voltage drive and at a high rotation speed, so that the noise of the fan may be worsened.
[0014]
The present invention, all SANYO has been made to solve the above problem, the projection morphism display device, cooled incident side polarizing plate, a liquid crystal panel and the exit side polarizing plate efficiently and noise due to the blower An object of the present invention is to provide a projection display device capable of lowering the level.
[0015]
[Means for Solving the Problems]
The invention according to claim 1 is an optical system unit having a light source and a plurality of light valves and a projection lens disposed above the light source and around the cross prism, and a cooling means for cooling the optical system unit. Oite a projection type display device and a exterior cabinet assembled, optics and the cooling means, the flat type sirocco fan disposed in the lower portion of the outer cabinet, which is placed on top of the sirocco fan A duct that guides cooling air introduced to the light valve of the system unit to the periphery of the cross prism, and an air volume that is provided around the cross prism inside the duct and controls at least the cooling air flow guided to the plurality of light valves. Consists of control means. By disposing the fan at the lower part of the exterior cabinet, the noise level can be lowered, and cooling air with high static pressure can be sent around the cross prism at the upper part of the exterior cabinet by the sirocco fan and duct. In addition, cooling air with high static pressure from the sirocco fan can be distributed to the plurality of light valves at an appropriate ratio.
[0016]
According to a second aspect of the present invention, in the first aspect, an air inlet for sucking air into the sirocco fan is disposed on the lower surface of the exterior cabinet. By configuring in this way, noises are alleviated because the operator and the audience do not directly listen to the wind noise accompanying the intake.
[0017]
According to a third aspect of the present invention, in the second aspect , the sirocco fan is disposed between the light source and the lower surface of the exterior cabinet.
[0018]
According to a fourth aspect of the present invention, in the first aspect , the light valve further includes a first light valve that modulates red light, a second light valve that modulates green light, and a third light valve that modulates blue light. The air volume control means guides the cooling air to the first, second and third light valves at a ratio of 1: 2: 3. By comprising in this way, it can blow in the said ideal form to the said each light valve.
[0019]
According to a fifth aspect of the present invention, in the first aspect , the air volume control means can operate the air volume from the outside of the exterior cabinet. With this configuration, it can be easily operated from the outside so that the cooling air to the optical system unit has an appropriate ratio.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a projection display device 1 of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof.
[0021]
The projection display device 1 includes an optical system unit 2 including a light source 21, a light valve 35, and a projection lens 33, and a sirocco fan (hereinafter simply referred to as a sirocco fan 3) as a cooling fan 3 that cools the optical system unit 2. ), A vertically long exterior cabinet (housing) 4 in which the optical system unit 2 and the sirocco fan 3 are assembled, a duct 5 for guiding the cooling air produced by the sirocco fan 3 to the optical system unit 2, Air volume control means 6 that is provided in the duct 5 and guides the cooling air produced by the sirocco fan 3 to the light valve 35 of the optical system unit 2 at a predetermined ratio, and a light source exhaust fan 7 are provided.
[0022]
The optical system unit 2 is mounted in the exterior cabinet 4 with the light source 21 side down and the light valve 35 side up. The optical system unit 2, and overlapping description is omitted because it is substantially the same as the conventional optical unit shown in Figures 5-6.
[0023]
The aforementioned sirocco fan 3, flat type sirocco fan (multiblade fan) is used.
[0024]
The sirocco fan 3 is disposed between the light source 21 and the bottom surface 4 d of the exterior cabinet 4 with the air outlet 3 a facing the back surface 4 c of the exterior cabinet 4. The cooling air blown out from the air blowing port 3 a of the sirocco fan 3 is guided to each part of the optical system unit 2 by the duct 5.
[0025]
The duct 5 includes a first duct portion 51 for R, G, and B for guiding the cooling air sent from the sirocco fan 3 to the periphery of the cross prism 32 of the optical system unit 2, and the cooling air as a light source. 21 includes a second duct portion 52 for a light source for guiding it to the periphery.
[0026]
As shown in FIG. 2, the first duct portion 51 extends to the periphery of the cross prism 32 through the side of the PS conversion element 23 of the optical system unit 20. As shown in FIG. 3, an inclined surface 53 for changing the direction of the cooling air sent from the sirocco fan 3 is provided at the upper end portion of the first duct portion 51, and an intake air provided in the optical system unit 2 The air volume control means 6 for controlling the air volume of the cooling air introduced into the openings 38R, 38G, 38B is provided. Then, the cooling air sent from the sirocco fan 3 strikes the inclined surface 53 and is changed in direction by approximately 90 °, and the air volume is controlled by the air volume control means 6, and the openings 38 R, 38 G, 38 B. After being introduced to the cross prism 32 side and cooling the cross prism 32 and the like, as shown in FIG. 1, the surface 4 e side on which the projection lens 33 of the exterior cabinet 4 is disposed by the third duct 58. The air is exhausted to the outside through an exhaust port 4b provided in.
[0027]
The inclined surface 53 is preferably provided below the G and B openings 38G and 38B that require a large air flow for cooling.
[0028]
As shown in FIG. 3, the air volume control means 6 is configured by rotatably mounting an air volume control plate 55 by a shaft 54, and rotates the air volume control plate 55 around the shaft 54. By controlling the angle of the air volume control plate 55, the air volume introduced into the RGB openings 38R, 38G, and 38B can be finely adjusted. The air volume control means 6 can be operated from outside by operating means (not shown).
[0029]
FIG. 4 shows the relationship between the air volume and the polarizing plate temperature, and shows the individual blast volume and temperature reduction curves for each of the RGB openings. By providing an appropriate air volume balance based on this curve, the polarizing plate can be maintained in an appropriate temperature range.
[0030]
As a result of the experiment, cooling air was distributed in the order of 1: 2: 3 from the openings 38R, 38G, and 38B to the polarizing plates 36 and 37 and the red, green, and blue liquid crystal panels interposed therebetween. By doing so, it was found that the temperature of the light valve could be reduced most efficiently overall.
[0031]
In addition, as shown in FIG. 2, a first opening 56 is provided in a portion of the first duct portion 51 facing the PS conversion element 23 of the optical system unit 20, and a part of the cooling air is provided. Passes through the first opening 56 and hits the PS conversion element 23 to cool it.
[0032]
The second duct portion 52 is branched from the vicinity of the first opening 56 and extends to the vicinity of the light source 21. A second opening 57 is provided at the tip of the second duct portion 52. The cooling air introduced into the second duct portion 52 through the first duct 51 strikes the light source 21 through the second opening 57, cools it, and then exhausts the light source portion. and it is discharged to the outside from the front side of the exterior cabinet 4 both the exhaust made of fan 7.
[0033]
The second duct portion 52 has an air volume control plate 61 on the downstream side (the second opening portion 57 side) of the first opening portion 56.
[0034]
The air volume control plate 61 operates in conjunction with a slide switch (not shown), and can adjust the air flow rate to the PS conversion element 23 and the light source 21 side. In the power saving mode provided for improving the long-term reliability of the light source 21, the output from the light source 21 becomes small. Noise can be reduced by reducing the voltage (number of rotations).
[0035]
An air suction port 71 is provided at a position corresponding to the sirocco fan 3 on the lower surface of the exterior cabinet 4, and a filter 72 is attached to the air suction port 71. The filter 72 is for protecting the liquid crystal panels 31R, 31G, and 31B, the cross prism 32, and the like from dust and the like by removing dust and the like contained in the outside air. When the filter 72 is used, the suction-side inflow resistance increases, and the air flow rate decreases. In particular, when an axial fan is used as a conventional cooling fan, noise increases with a decrease in the amount of air blown. When a sirocco fan is used, a reduction in the air flow rate is inevitable, but the noise of the sirocco fan is rather reduced because it is contained in the exterior cabinet 4 by the sealing effect of the filter 72.
[0036]
The duct 5 may be configured as a separate member from the optical system unit 2 and the exterior cabinet 4 and attached to the exterior cabinet 4 or may be formed integrally with the exterior cabinet 4.
[0037]
In the above-described embodiment, the air volume control means 6 is rotatable and can be adjusted from the outside. However, the air volume control means 6 is fixed or integrally formed with the duct, and simply controls the distribution of the air volume. It can also be applied to cases.
[0038]
In the above-described embodiment, the air volume control means 6 is illustrated as one partition plate. However, the air volume control means 6 is a plurality of parts, the shape thereof is a curved surface, and a porous hole through which a part of the cooling air passes. You may comprise with a quality material.
[0039]
【The invention's effect】
The projection display device of the present invention has the following effects.
(1) In the projection type display device according to the first aspect of the present invention , the fan is arranged at the lower part of the exterior cabinet to reduce the noise level, and the cooling air having a high static pressure around the cross prism at the upper part of the exterior cabinet by the sirocco fan and the duct. Can send. In addition, cooling air with high static pressure from the sirocco fan can be distributed to the plurality of light valves at an appropriate ratio.
(2) In the projection type display device according to the second aspect, since the cooling wind is introduced into the exterior cabinet from the lower surface of the exterior cabinet, the wind noise generated by the intake air is not directly heard by the operator or the audience, so that noise is generated. Alleviated.
(3) The projection type display device according to claim 3 is the projection type display device according to claim 2, further comprising a sirocco fan disposed between the light source and the lower surface of the exterior cabinet.
(4) In the projection type display device according to the fourth aspect, since the cooling air is introduced at a ratio of 1: 2: 3 according to the heat generation ratio of the RGB liquid crystal panels, the RGB liquid crystal panels are ideal. Can be cooled.
(5) The projection type display device according to claim 5 can easily adjust the air volume from the outside of the exterior cabinet.
[Brief description of the drawings]
FIG. 1 is a perspective view of a projection display device.
FIG. 2 is a schematic side view of a projection display device.
FIG. 3 is a schematic cross-sectional view of a projection display device.
FIG. 4 is a graph showing a measured polarizing plate temperature-air flow characteristic curve with an axial fan and a sirocco fan.
FIG. 5 is a schematic side view of a conventional vertical projection display device.
FIG. 6 is a schematic cross-sectional view of a conventional vertical projection display device.
FIG. 7 is a schematic cross-sectional view of a conventional horizontal projection display device.
FIG. 8 is a static pressure-air flow characteristic diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projection type display apparatus, 2 ... Optical system unit, 3 ... Sirocco fan, 4 ... External device cabinet, 4b ... Exhaust port, 5 ... Duct, 6 ... Air volume adjustment means, 21 ... Light source, 33 ... Projection lens, 35 ... Light valve.

Claims (5)

An optical system unit having a light source and a plurality of light valves and a projection lens disposed above the light source and around the cross prism ;
Oite the projection display apparatus including an exterior cabinet assembled cooling means for cooling the optical system unit,
The cooling means is
A flat sirocco fan disposed at the bottom of the exterior cabinet;
A duct that guides cooling air introduced to the light valve of the optical system unit disposed above the sirocco fan to the periphery of the cross prism ;
A projection-type display device, comprising: an air volume control unit that is provided around the cross prism inside the duct and that controls at least an air volume of cooling air guided to the plurality of light valves . The projection display device according to claim 1, wherein an air suction port for sucking air into the sirocco fan is provided on a lower surface of the exterior cabinet . The projection display device according to claim 2, wherein the sirocco fan is disposed between the light source and a lower surface of the exterior cabinet . The light valve comprises a first light valve that modulates red light, a second light valve that modulates green light, and a third light valve that modulates blue light,
4. The projection type display according to claim 3, wherein the air volume control means guides the cooling air to the first, second and third light valves at a ratio of 1: 2: 3. apparatus. The projection type display device according to claim 3, wherein the air volume control means is capable of adjusting the air volume from the outside of the exterior cabinet.

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