JP2002214711A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower a noise value during drive. SOLUTION: The projection display device 1 is provided with a lamp unit 21 having has a power bulb 24 as a light source in a casing 2, and a prism block part 20 having has a cross prism 19 which composites colors of light of a prescribed wavelength band of light valves 17R, 17G and 17B to perform the modulation or the like of the light, and projects the light emitted from the power bulb and made incident on the prism block part through a projection lens 26. The projection display device 1 is further provided with a suction fan 25 to capture a cooling wind in a casing through an inlet 28, and an exhaust fan 27 to exhaust the captured cooling wind out of the casing through an outlet 29. The suction fan is arranged under the prism block part, the exhaust fan is arranged under the lamp unit, and the inlet and the outlet are formed in the bottom surface part 2a of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of a projection display device. More specifically, a projection type display including a lamp unit having a power supply bulb serving as a light source in an outer casing, a light valve for performing light modulation and the like, and a prism block having a cross prism for performing color synthesis of light in a predetermined wavelength range. The technical field of the device.

[0002]

2. Description of the Related Art A projection type display device has, for example, a power valve supported by a reflector and a light valve for modulating light or the like, and is obtained by irradiating light emitted from the power valve to the light valve. In some cases, a projected image is projected on a screen or the like via a projection lens.

An example of such a conventional projection display device is schematically shown in FIGS.

[0004] The projection type display device "a" has required members arranged inside an outer casing "b".

The outer casing b has, for example, a flat box shape, and has an intake fan c, an exhaust fan d, a prism block e and a lamp unit f disposed therein.

An intake fan c is arranged at a position near the bottom surface g of the outer casing b.
The intake port h is formed below the.

Various optical components are arranged in the outer casing b, and a prism block e constituting a part of the optical components is arranged right above the intake fan c. The prism block e is composed of a cross prism, a polarizing plate, a light valve, and the like, which are arranged to face the incident surface.

The exhaust fan d is provided on one side i of the outer casing b.
An exhaust port j is formed on the side surface portion i beside the exhaust fan d.

The lamp unit f includes, for example, a power source bulb serving as a light source supported by a reflector disposed in a lamp box, and is disposed beside the exhaust fan d.

The front end of the projection lens 1 projects from the front surface k of the outer casing b.

When the projection display device a is driven, outside air taken in by an intake fan c from an intake port h formed in a bottom surface portion g of the outer casing b is sent to the prism block portion e as cooling air. The prism block e is cooled and kept at a temperature lower than the guaranteed temperature limit. The cooling air is discharged from the exhaust port j to the outside of the outer casing b by the exhaust fan d, and at this time, the cooling air drawn into the exhaust fan d passes through the interior of the reflector of the lamp unit f, thereby cooling the power supply valve. .

[0012]

However, in the conventional projection type display device a, the exhaust fan d is arranged at a position near the side portion i of the outer casing b, and the exhaust fan d is provided at the side of the exhaust fan d. Since the opening j is formed and the cooling air is discharged to the side of the outer casing b, there is a problem that the noise value is high. Since the projection display device a is often used in meetings and the like, noise is a particular problem.

Accordingly, it is an object of the projection display apparatus of the present invention to overcome the above-mentioned problems and reduce the noise value during driving.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a projection type display device according to the present invention comprises: an intake fan for taking in cooling air into an outer casing through an air intake; An exhaust fan that exhausts from the inside of the outer casing through the exhaust port is provided, an intake fan is arranged below the prism block, an exhaust fan is arranged below the lamp unit, and the intake port and the exhaust port are It is formed on the bottom of the case.

Therefore, cooling air is taken in from the lower side of the apparatus and discharged from the lower side.

In order to solve the above-mentioned problems, another projection type display device according to the present invention comprises: an intake fan for taking in cooling air into an outer casing through an intake port; And an exhaust fan that exhausts from the inside of the outer casing through the outer casing, the exhaust fan is arranged on the side of the lamp unit, and the intake port and the exhaust port are formed on the bottom surface of the outer casing.

Therefore, the cooling air is taken in from the lower surface side of the apparatus and discharged from the lower surface side, and the height of the outer casing is reduced.

Still another aspect of the present invention is a projection display device of a vertical type, in which cooling air is taken into an outer casing through an air inlet to solve the above-mentioned problem. An intake fan, an exhaust fan that discharges the taken in cooling air from the outer casing through an exhaust port, and a ventilation duct that guides the cooling air taken in by the intake fan to the prism block are used for the intake. The fan is disposed on the inner side of the bottom of the outer casing, the exhaust fan is disposed below the lamp unit, and the intake and exhaust ports are formed on the bottom of the outer casing.

Therefore, the cooling air is taken in from the lower surface side of the apparatus and discharged from the lower surface side, and the degree of freedom of the arrangement position of the prism block is improved.

[0020]

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

Projection display device 1 according to the first embodiment
Required components are arranged in a flat box-shaped outer casing 2 (see FIGS. 1 to 3), and the projection type display device 1 is placed on a desk or the like at four corners of a bottom surface 2a of the outer casing 2. There are provided stands 3, 3,... For mounting (see FIGS. 2 and 3).

An optical unit 4 composed of optical components is housed in the outer casing 2 (see FIG. 1). As the optical unit 4, fly-eye lenses 5, 6, PS
Conversion element 7, condenser lens 8, dichroic mirrors 9R, 9G, relay lens 10, total reflection mirror 1
1, relay lens 12, total reflection mirrors 13, 14, field lenses 15R, 15G, 15B, incident side polarizing plate 1
6R, 16G, 16B, light valves 17R, 17G,
17B, an output side polarizing plate 18R, 18G, 18B, a cross prism 19 and the like are provided.

The fly-eye lenses 5 and 6 divide light emitted from a discharge lamp described later having an intensity distribution into a number of light spots,
This is for making the luminance distribution of the entire screen of 7G and 17B uniform, and is arranged at a distance from the discharge lamp.

A PS conversion element 7 and a condenser lens 8 are arranged close to the fly-eye lens 6. PS
The conversion element 7 includes a polarization beam splitter arranged in a strip shape and a phase difference plate provided intermittently corresponding thereto, and converts the polarization direction of incident light.

The dichroic mirrors 9R and 9G are arranged in the same direction and inclined at 45 °, and the dichroic mirror 9R reflects 90 ° of the incident light in the red wavelength range, and the dichroic mirror 9G is incident. It has the function of reflecting light in the green wavelength range of light by 90 °.

The total reflection mirror 13 is disposed in front of the dichroic mirror 9R, reflects the light in the red wavelength range reflected by the dichroic mirror 9R, and guides the light to the field lens 15R.

On the side of the dichroic mirror 9G, a relay lens 10 and a total reflection mirror 11 are disposed separately from each other, and in front of the total reflection mirror 11, a relay lens 12 and a total reflection mirror 14 are separated from each other. Are located. These total reflection mirrors 11 and 14 transmit the light in the blue wavelength range transmitted through the dichroic mirror 9G to the light 9.
The light is reflected by 0 ° and guided to the field lens 15B.

Field lenses 15R, 15G, 15B
, The incident side polarizing plates 16R, 16G, 1
6B, and the incident-side polarizing plates 16R, 16G, 16
Light valves 17R, 1
7G and 17B are arranged. Light valve 17R,
17G and 17B are arranged so as to face the respective entrance surfaces of the cross prism 19, respectively. Further, each incidence surface of the cross prism 19 and the light valves 17R, 17G, 1
7B, between the output side polarizing plates 18R, 18R.
G and 18B are arranged.

The input side polarizing plates 16R, 16G, 16B, the light valves 17R, 17G, 17B, the output side polarizing plate 18
The prism block 20 is configured by the R, 18G, 18B, the cross prism 19, and the like.

On the incident side of the fly-eye lens 5, a lamp unit 21 is arranged. Lamp unit 2
1 includes a discharge lamp 24 attached to a reflector 23 disposed in a lamp box 22.

An intake fan 25 is disposed directly below the prism block section 20, and the intake fan 25 is disposed such that a rotation axis thereof is directed in a vertical direction. An axial fan is used as the intake fan 25.

A projection lens 26 is disposed in front of the prism block 20, and the tip of the projection lens 26 projects forward from the outer casing 2.

An exhaust fan 27 is disposed directly below the lamp unit 21, and the exhaust fan 27 is disposed so that a rotation axis thereof is directed in a vertical direction. An axial fan is used as the exhaust fan 27.

An intake port 28 and an exhaust port 29 are formed in the bottom 2a of the outer casing 2. The intake port 28 is formed directly below the intake fan 25, and the exhaust port 29 is
7 (see FIG. 2).

A partition wall 30 extending in the front-rear direction is vertically provided from the outer surface of the bottom surface portion 2a of the outer casing 2, and the partition wall 30 is provided between the intake port 28 and the exhaust port 29 (FIG. 1). 2
And FIG. 3). The partition wall 30 has, for example, the same amount of downward projection from the bottom surface 2a as that of the stands 3, 3,. Therefore, the partition wall 30 is connected to the intake port 28.
In addition to functioning as a partition between the space on the side and the space on the exhaust port 29 side, it also functions as a stand.

Hereinafter, the path of the light emitted from the discharge lamp 24 will be described (see FIG. 1).

The light emitted from the discharge lamp 24 passes through the optical path P 1, is divided into a large number of light spots by the fly-eye lenses 5 and 6, and is incident on the PS conversion element 7. P
The polarization directions of the light are aligned in the S conversion element 7, and the light enters the dichroic mirror 9R via the condenser lens 8.

Of the light incident on the dichroic mirror 9R, the light in the red wavelength range is reflected by 90 °, is further reflected by the total reflection mirror 13 through the optical path P2 and is further reflected by 90 °, and is incident on the field lens 15R.

The light incident on and transmitted through the dichroic mirror 9R is incident on the dichroic mirror 9G, and of the incident light, the light in the green wavelength range is reflected by 90 ° and is incident on the field lens 15G via the optical path P3. You.

The light incident on and transmitted by the dichroic mirror 9G passes through the optical path P4, is reflected by the total reflection mirror 11 through the relay lens 10, and is further reflected by the total reflection mirror 14 through the relay lens 12.
The reflected light in the blue wavelength range is transmitted to the field lens 15B.
Is incident on.

Field lenses 15R, 15G, 15B
Out of the light in the respective wavelength ranges, the light having a predetermined polarization direction transmitted through the incident-side polarizing plates 16R, 16G, and 16B is output from the light valves 17R, 17G, and 17B based on the applied image signals. Then, the polarization plane is rotated. A predetermined polarization component of the light whose polarization plane has been rotated is transmitted through the output-side polarizing plates 18R, 18G, and 18B, is incident on the cross prism 19 as image light, and is color-combined. Then, the color-combined light is emitted from the projection lens 20, and a full-color image is projected on a screen (not shown) or the like.

When the projection display apparatus 1 is driven, the intake fan 25 is rotated to take in outside air as cooling air from an intake port 28 formed in the bottom surface 2a of the outer casing 2, and the exhaust fan 27 is rotated. The cooling air taken in is discharged from the exhaust port 29.

The cooling air taken in by the rotation of the intake fan 25 is blown toward the prism block 20 located directly above the intake fan 25, and the prism block 20 is cooled to a temperature below the guaranteed temperature limit. Is held.

Further, the cooling air taken into the outer casing 2 is drawn into the exhaust fan 27, and at this time, the cooling air passes through the inside of the reflector 23 of the lamp unit 21 located directly above the exhaust fan 27. As a result, the discharge lamp 24 is cooled. Then, the cooling air is discharged from the exhaust port 29 to the outside of the outer casing 2 by the exhaust fan 27.

Since the projection type display device 1 is provided with the partition wall 30 as described above, it is taken in from the intake port 28 and discharged from the exhaust port 29, and the cooling air whose temperature has risen from the intake port 28 again. Is prevented, and the cooling efficiency is improved.

Although the case where the partition wall 30 having a function as a stand is provided has been described above, the partition wall 30 is provided.
Without having a function as a stand,
May be made smaller than that of the stand so as to have only a function of preventing cooling air from being taken in again from the intake port 28.

Further, the partition wall is not limited to the shape shown in FIGS. 2 and 3, and for example, as shown in FIG.
A U-shaped partition wall 31 that surrounds 7 from three sides may be used. When the partition wall 31 having such a U-shape is provided, the function of preventing the cooling air from being taken in again from the intake port 28 can be more effectively exerted.

Further, as shown in FIG.
Without providing the air inlet 31, air inlets 28 and air outlets 29 are provided with air flow direction control slits 32, 33 for controlling the air flow direction of the cooling air. The intake from the intake port 28 again may be prevented.

Further, as shown in FIG. 6, in addition to the wind direction control slits 32 and 33, a partition wall 30 or a partition wall 31 is provided.
May be provided to more effectively exhibit the function of preventing cooling air from being taken in again from the intake port 28.

In the projection type display device 1, as described above, the intake fan 25 is arranged below the prism block 20 and the exhaust fan 27 is arranged below the lamp unit 21. And the exhaust port 29 is formed in the bottom surface 2a of the outer casing 2, so that the prism block 20 and the lamp unit 2 which need to be particularly cooled are required.
1, the cooling efficiency is high, and noise can be prevented by reducing the noise value.

FIGS. 7 and 8 show a projection display 1A using a wind guide 34 instead of a partition wall.

The projection type display device 1A shown below differs from the projection type display device 1 only in that a stand and a partition wall are not provided. Only the different parts will be described in detail, and the other parts will be denoted by the same reference numerals as those of the similar parts in the projection display device 1, and the description thereof will be omitted or omitted.

Each part of the air guide 34 is formed in a flat plate shape, and a base end 34a parallel to the bottom wall 2a of the outer casing 2 and partitions 34b, 34b suspended from both side edges of the base end 34a.
And stand portions 34c, 34c protruding from the lower edges of the partition portions 34b, 34b in a direction away from each other.
The base portion 34a and the partition portions 34b, 34b are located between the intake port 28 and the exhaust port 29, and the stand portions 34c, 34
c is parallel to the bottom wall 2a.

The air guide 34 is configured such that the stand portions 34c, 34c can move relative to the outer casing 2 in a direction in which the stand portions 34c, 34c are separated from and brought into contact with the bottom surface portion 2a. Position (see FIG. 7) and stand 3
4c and 34c move between the second position (see FIG. 8) in contact with the bottom surface 2a.

The state in which the air guide 34 is in the second position is a state in which the projection type display device 1A is not used, and the flow path of the cooling air to the intake port 28 and the cooling air from the exhaust port 29. The flow path is not secured (see FIG. 8). By moving the air guide 34 from the second position to the first position, a flow path for cooling air is secured, and the projection display device 1A can be used (see FIG. 7).

As described above, the projection type display device 1A is provided with the wind guide 34 having the stand portions 34c and 34c formed in a flat plate shape parallel to the bottom portion 2a of the outer casing 2. Therefore, for example, even if the projection display device 1A is placed on a flexible place or part, the flow path of the cooling air can be reliably secured, and the projection display device 1 Irrespective of the location or the state of the part, efficient cooling performance for each optical component can be maintained.

Further, the air guide 34 is provided on the stand 34.
c and 34c, there is no need to provide a separate stand, which contributes to a reduction in the number of parts.

Further, when the projection type display device 1A is not used, the wind guide 34 can be held at the first position, so that the size of the projection type display device 1A when not used can be reduced. It is possible to prevent dust from entering the outer casing 2 when not in use.

In the projection type display device 1A, similarly to the projection type display device 1, the air guide 34 is connected to the exhaust port 2A.
9 may be formed so as to surround it from three sides.
The wind direction control slits 32 and 33 may be provided.

Next, a second embodiment of the projection type display device will be described (see FIGS. 9 to 11).

The projection type display device 1 according to the second embodiment
B differs from the above-described projection display device 1 only in that the positional relationship between the exhaust fan 27 and the lamp unit 21 is different. Therefore, only the portions different from those in the projection display device 1 are described in detail. A description will be given, and the other portions will be denoted by the same reference numerals as those of the same portions in the projection display device 1, and the description thereof will be omitted, or the illustration will be omitted.

The projection type display device 1B includes an exhaust fan 27
And the lamp unit 21 are spaced apart from each other back and forth, and the exhaust fan 27 is located slightly above the intake fan 25. An axial fan is used as each of the intake fan 25 and the exhaust fan 27, and the intake port 28 is formed below the intake fan 25, and the exhaust port 29 is formed below the exhaust fan 27. I have.

When the projection display device 1B is driven, the intake fan 25 is rotated to take in outside air as cooling air from an intake port 28 formed in the bottom surface 2a of the outer casing 2 and rotate the exhaust fan 27. The cooling air taken in is discharged from the exhaust port 29.

The cooling air taken in by the rotation of the intake fan 25 is blown toward the prism block 20 located directly above the intake fan 25, and the prism block 20 is cooled to a temperature below the guaranteed temperature limit. Is held.

The cooling air taken into the outer casing 2 is drawn into the exhaust fan 27, and at this time, the cooling air passes through the inside of the reflector 23 of the lamp unit 21 located on the side of the exhaust fan 27. As a result, the discharge lamp 24 is cooled. Then, the cooling air is discharged from the exhaust port 29 to the outside of the outer casing 2 by the exhaust fan 27.

In the projection type display device 1B, as described above, since the exhaust fan 27 is arranged on the side of the lamp unit 21, the overall device can be made thinner, and Since the port 28 and the exhaust port 29 are formed on the bottom surface 2a of the outer casing 2, noise can be prevented by reducing the noise value.

Incidentally, even in the projection type display device 1B, the partition walls 30, 31, the wind direction control slits 32, 33 and the air guide 34 are provided to prevent the cooling air from being taken in from the air inlet 28 again. May be achieved.

FIG. 12 to FIG. 14 show a case where the axial flow fans used as the intake fan 25 and the exhaust fan 27 are generally replaced with static pressure without changing the arrangement positions of the components of the projection display 1B. It shows a projection display 1C using a high sirocco fan.

In the sirocco fan 35 used as an intake fan, for example, the discharge section 35a is directed backward, and cooling air discharged from the discharge section 35a is supplied to the prism block section via the first air duct 36. It is blown toward 20.

The sirocco fan 37 used as the exhaust fan and the lamp unit 21 are connected to the second ventilation duct 3.
The cooling air cooled by the discharge lamp 24 of the lamp unit 21 is drawn into the sirocco fan 37 through the second ventilation duct 38.

The sirocco fan 37 is, for example,
7a faces the sirocco fan 35 side,
The cooling air discharged from 7a is discharged from the exhaust port 29 via the third ventilation duct 39 connected to the discharge portion 37a.

In the projection type display device 1C, as described above, the sirocco fan 35 is disposed on the side of the lamp unit 21, so that the overall thickness of the device can be reduced. Further, in addition to forming the intake port 28 and the exhaust port 29 on the bottom surface 2a of the outer casing 2, the sirocco fans 35 and 37 are used as the intake fan and the exhaust fan, so that the noise value is further reduced. Noise can be prevented by the reduction.

Even in the projection type display device 1C, the partition walls 30, 31, the wind direction control slits 32, 33, and the air guide 34 are provided to prevent the cooling air from being taken in from the air inlet 28 again. May be achieved.

Next, a third embodiment of the projection display apparatus will be described (see FIG. 15).

The projection type display device 1 according to the third embodiment
D is a so-called vertical type projection display device in which required optical components and the like are arranged in a vertically formed outer casing as compared with the above-mentioned projection type display device 1. The only difference is that the cooling air is blown from the intake fan to the prism block portion via the intake fan. Therefore, only different portions as compared with the projection display device 1 will be described in detail.
The other portions are denoted by the same reference numerals as those of the same portions in the projection display device 1, and the description thereof is omitted.
Or illustration is omitted.

The projection type display device 1D has an outer casing 2D formed to be vertically long, and an exhaust fan 27 and an intake fan 25.
Are arranged at a position near the bottom surface 2b of the outer casing 2D so as to be separated from each other. An intake port 28 is formed at a position directly below the intake fan 25 on the bottom surface 2b, and an exhaust port 29 is formed at a position directly below the exhaust fan 27 on the bottom surface 2b.

The prism block section 20 is disposed at a position closer to the upper side in the outer casing 2D due to the arrangement space. The prism block section 20 is connected to the prism block section 20 via a ventilation duct 40 connected to the intake fan 25. Cooling air is sent.

Immediately above the exhaust fan 27, a lamp unit 21 is disposed.

At the time of driving the projection display apparatus 1D, the intake fan 25 is rotated so that the outside air is taken in as cooling air from the intake port 28 formed in the bottom surface 2b of the outer casing 2D, and the exhaust fan 27 is rotated. The cooling air taken in is discharged from the exhaust port 29.

The cooling air taken in by the rotation of the intake fan 25 is blown from the intake fan 25 to the prism block section 20 through the ventilation duct 40, and the prism block section 20 is cooled and the limit assurance temperature is reached. It is kept below.

The cooling air taken into the outer casing 2 is drawn into the exhaust fan 27. At this time, the cooling air passes through the inside of the reflector 23 of the lamp unit 21 located above the exhaust fan 27. The discharge lamp 24 is cooled. Then, the cooling air is discharged from the exhaust port 29 to the outside of the outer casing 2 by the exhaust fan 27.

Even in the case of a vertical type device such as the projection type display device 1D, the intake fan 25 and the exhaust fan 27 are arranged at positions near the bottom portion 2b by using the air duct 40 so that the bottom portion 2b Since the intake port 28 and the exhaust port 29 can be formed at the same time, noise can be prevented by reducing the noise value. Further, by using the air duct 40, the intake fan 25 can be connected to the outer casing 2D regardless of the position of the optical component, for example, the prism block 20.
It can be arranged below the inside, and the degree of freedom of design can be improved.

Even in the projection type display device 1D, the partition walls 30, 31, the wind direction control slits 32, 33, and the air guide 34 are provided to prevent cooling air from being taken in from the air inlet 28 again. May be achieved.

The specific shape and structure of each part shown in each of the above embodiments are merely examples of the embodiment of the present invention. The scope should not be construed as limiting.

[0085]

As is apparent from the above description, the projection display apparatus of the present invention comprises a lamp unit having a power supply bulb as a light source in an outer casing, a light valve for modulating light and the like, and a predetermined wavelength. A prism block portion having a cross prism for color-combining light in a region, and a projection display device that projects light emitted from a power valve and incident on the prism block portion via a projection lens, wherein an intake port is provided. An intake fan that draws cooling air into the outer casing via
An exhaust fan that exhausts the taken in cooling air from the outer casing through an exhaust port is provided.An intake fan is arranged below the prism block, and an exhaust fan is arranged below the lamp unit. The port and the exhaust port are formed on the bottom of the outer casing.

Therefore, the cooling efficiency of the prism block and the lamp unit, which need to be particularly cooled, is high, and noise can be prevented by reducing the noise value.

According to the second aspect of the present invention, a partition wall is provided on the outer surface of the bottom surface of the outer casing, and separates cooling air taken in and cooling air exhausted from the outer casing. Therefore, it is possible to prevent the cooling air that has been taken in from the intake port and discharged from the exhaust port and has an increased temperature from being taken in again from the intake port, thereby improving the cooling efficiency.

According to the third aspect of the present invention, a partitioning portion is provided on the outer surface of the bottom portion of the outer casing to separate cooling air taken into the outer casing and cooling air exhausted from the outer casing. And a stand section formed in a flat plate shape parallel to the section, and a wind guide for guiding the taken-in cooling air to the intake port is provided. Regardless, it is possible to reliably secure the flow path of the cooling air,
Efficient cooling performance for each optical component can be maintained.

Further, it is not necessary to provide a stand separately from the air guide, which contributes to a reduction in the number of parts.

According to the fourth aspect of the present invention, since the stand guide can be moved relative to the outer casing in a direction in which the stand separates from and comes into contact with the bottom of the outer casing, the projection type display when not in use. It is possible to reduce the size of the device and prevent dust from entering the outer casing when not in use.

Further, another projection type display device of the present invention comprises a lamp unit having a power supply bulb as a light source in an outer casing, a light valve for modulating light, and a cross prism for performing color synthesis of light in a predetermined wavelength range. A projection type display device that includes a prism block portion having, and projects light emitted from a power valve and incident on the prism block portion via a projection lens, and cooling air is introduced into an outer casing through an intake port. It has an intake fan that takes in air, and an exhaust fan that exhausts the taken in cooling air from the outer casing through an exhaust port.The exhaust fan is placed beside the lamp unit, and the intake port and exhaust port are removed. It is characterized in that it is formed on the bottom of the case.

Therefore, it is possible to reduce the thickness of the entire apparatus and to prevent noise by reducing the noise value.

In the invention according to claim 6, since a sirocco fan is used as an exhaust fan and the sirocco fan and the lamp unit are connected through a ventilation duct, noise can be further reduced to reduce noise. Can be achieved.

According to the invention described in claim 7, a partition wall is provided on the outer surface of the bottom portion of the outer housing to separate cooling air taken into the outer housing from cooling air exhausted from the outer housing. Therefore, it is possible to prevent the cooling air that has been taken in from the intake port and discharged from the exhaust port and has an increased temperature from being taken in again from the intake port, thereby improving the cooling efficiency.

According to the invention as set forth in claim 8, the outer surface of the bottom surface of the outer housing has a partition for separating cooling air taken into the outer housing and cooling air discharged from the outer housing, And a stand section formed in a flat plate shape parallel to the section, and a wind guide for guiding the taken-in cooling air to the intake port is provided. Regardless, it is possible to reliably secure the flow path of the cooling air,
Efficient cooling performance for each optical component can be maintained.

According to the ninth aspect of the present invention, since the stand guide can be moved relative to the outer casing in a direction in which the stand portion comes into contact with and separates from the bottom portion of the outer casing, the projection type display when not in use. It is possible to reduce the size of the device and prevent dust from entering the outer casing when not in use. .

Still another projection type display device of the present invention is a lamp in which required optical components and the like are arranged in a vertically long outer casing, and a power supply bulb serving as a light source is provided in the outer casing. A unit and a light valve for performing light modulation and the like and a prism block portion having a cross prism for performing color synthesis of light in a predetermined wavelength range, the outer case is formed in a vertically long box shape, and the prism block portion is emitted from a power supply valve. A vertical projection type display device that projects light incident on a projector lens through a projection lens, and an intake fan that takes in cooling air into an outer casing through an intake port, and exhausts the taken in cooling air. It has an exhaust fan that exhausts from the inside of the outer casing through the opening, and a blower duct that guides cooling air taken in by the intake fan to the prism block.The intake fan is arranged on the inner surface side of the bottom part of the outer casing. And, an exhaust fan disposed below the lamp unit, characterized in that the formation of the inlet and outlet on the bottom portion of the outer casing.

Therefore, even in the case of a vertical type device, it is possible to prevent noise by reducing the noise value,
The intake fan can be arranged at a desired position irrespective of the arrangement position of the optical components, and the degree of freedom in design can be improved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a projection display device of the present invention together with FIG. 2 and FIG. 3, and FIG. 1 is a schematic plan view.

FIG. 2 is a schematic rear view.

FIG. 3 is a schematic bottom view.

FIG. 4 is a schematic bottom view showing a projection type display device in which the shape of a partition wall is changed.

FIG. 5 is a schematic rear view showing a projection type display device provided with a wind direction control slit instead of a partition wall.

FIG. 6 is a schematic rear view showing a projection display device provided with a wind direction control slit in addition to a partition wall.

7 shows a projection type display device provided with a wind guide along with FIG. 8, and this figure is a schematic rear view showing a state where the wind guide is at a first position.

FIG. 8 is a schematic rear view showing a state in which the air guide is at a second position.

FIG. 9 shows a second embodiment of the projection type display device of the present invention together with FIG. 10 and FIG. 11, and FIG. 9 is a schematic plan view.

FIG. 10 is a schematic side view.

FIG. 11 is a schematic rear view.

FIG. 12 shows a projection type display device using a sirocco fan together with FIGS. 13 and 14, and FIG. 12 is a schematic plan view.

FIG. 13 is a schematic side view.

FIG. 14 is a schematic rear view.

FIG. 15 is a schematic perspective view showing a third embodiment of the projection display device of the present invention.

16 shows a conventional projection display device together with FIGS. 17 to 19, and is a schematic plan view. FIG.

FIG. 17 is a schematic side view.

FIG. 18 is a schematic rear view.

FIG. 19 is a schematic rear view showing the flow of cooling air.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Projection display apparatus, 2 ... Outer housing, 2a ... Bottom part, 17R
... Light valve, 17G ... Light valve, 17B ... Light valve, 19 ... Cross prism, 20 ... Prism block unit, 21 ... Lamp unit, 24 ... Discharge lamp (power valve), 25 ... Intake fan, 26 ... Projection lens,
27: exhaust fan, 28: intake port, 29: exhaust port, 3
0: partition wall, 31: partition wall, 1A: projection display device, 3
4 ... wind guide, 34b ... partition part, 34c ... stand part, 1B ... projection type display device, 1C ... projection type display device, 3
5 ... sirocco fan, 36 ... first air duct, 37 ...
Sirocco fan, 1D: Projection display device, 2D: Outer casing,
2b: bottom part, 40: air duct

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 7/20 H05K 7/20 G

Claims (10)

[Claims] 1. A power supply comprising: a lamp unit having a power supply bulb serving as a light source in an outer housing; a light valve for performing light modulation and the like; and a prism block having a cross prism for performing color synthesis of light in a predetermined wavelength range. A projection display device for projecting light emitted from a valve and incident on a prism block portion through a projection lens, wherein an intake fan takes in cooling air into an outer casing through an intake port, and a taken-in cooling. An exhaust fan that exhausts wind from the outer casing through an exhaust port, an intake fan is arranged below the prism block, an exhaust fan is arranged below the lamp unit, and an intake port and an exhaust port are provided. Is formed on the bottom surface of the outer casing. 2. The device according to claim 1, wherein a partition wall is provided on an outer surface of a bottom portion of the outer housing to separate cooling air taken into the outer housing from cooling air exhausted from the outer housing. Projection display device. 3. A partition formed on an outer surface of a bottom portion of the outer case to separate cooling air taken into the outer case and cooling air discharged from the outer case, and a flat plate formed parallel to the bottom portion. The projection type display device according to claim 1, further comprising a wind guide for guiding the taken-in cooling air to the intake port. 4. The projection type display device according to claim 3, wherein the air guide is movable with respect to the outer housing in a direction in which the stand portion comes into contact with and separates from the bottom portion of the outer housing. 5. A power supply comprising: a lamp unit having a power supply bulb serving as a light source in an outer housing; a light valve for performing light modulation and the like; and a prism block having a cross prism for performing color synthesis of light in a predetermined wavelength range. A projection display device for projecting light emitted from a valve and incident on a prism block portion through a projection lens, wherein an intake fan takes in cooling air into an outer casing through an intake port, and taken in cooling. An exhaust fan that exhausts wind from the outer casing through the exhaust port is provided.The exhaust fan is arranged on the side of the lamp unit, and the intake port and exhaust port are formed on the bottom of the outer casing. Projection type display device. 6. The projection type display device according to claim 5, wherein a sirocco fan is used as an exhaust fan, and the sirocco fan and the lamp unit are connected via an air duct. 7. The device according to claim 5, wherein a partition wall is provided on an outer surface of a bottom portion of the outer housing to separate cooling air taken into the outer housing from cooling air discharged from the outer housing. Projection display device. 8. A partition formed on an outer surface of a bottom portion of the outer case to separate cooling air taken into the outer case from cooling air discharged from the outer case, and a flat plate formed parallel to the bottom portion. The projection type display device according to claim 5, further comprising a wind guide for guiding a cooling air to be taken into the air intake port. 9. The projection type display device according to claim 8, wherein the wind guide is movable with respect to the outer case in a direction in which the stand portion comes into contact with and separates from the bottom portion of the outer case. 10. A lamp unit having a power supply bulb serving as a light source in the outer casing, in which required optical components and the like are arranged in a vertically long outer casing, a light valve for modulating light and the like, and A prism block portion having a cross prism for color-synthesizing light in a predetermined wavelength range, wherein the outer casing is formed in a vertically elongated box shape, and the light emitted from the power supply valve and incident on the prism block portion is transmitted through the projection lens. A vertical projection type display device for projecting, wherein an intake fan takes in cooling air into an outer casing through an intake port, and exhaust air exhausts the taken-in cooling air from an outer casing through an exhaust port. Fan and a ventilation duct that guides the cooling air taken in by the intake fan to the prism block.The intake fan is located on the inner side of the bottom of the outer casing, and the exhaust fan is a lamp unit. Arranged below, a projection display device characterized by the formation of the inlet and outlet on the bottom portion of the outer casing.