JP2002258399A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and well-looking projection type image display device which is less restricted, in its outward appearance design without spoiling the dust removing operability in the case of the detection of dust stick ing on an image display element and is stably reliable by suppressing unwanted radiation, etc. SOLUTION: In an opening 5a of a housing 5 fitted above image display elements 20a, 20b, and 20c, an operation unit 9 is fitted detachably by a method such as snapping, screwing, etc., and the opening 5a is normally closed with the operation unit 9. If dust sticking on the image display elements 20a, 20b, and 20c is found, the operation unit 9 is removed and the dust is removed through the opening 5a by using an air nozzle 12, a cotton bud, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projection type image display device, and more particularly to a projection type image display device having an opening for removing dust attached to an image display element.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show a conventional projection type image display device. In the figure, reference numerals 1a, 1b, 1c denote R, G, B liquid crystal panel main bodies, respectively, and 2a, 2b, 2c denote incident polarizers arranged on the incident side of the liquid crystal panel main bodies 1a, 1b, 1c, respectively. , 3c are output polarizing plates disposed on the output side of the liquid crystal panel main bodies 1a, 1b, 1c, respectively.
0c is formed. 4 is a liquid crystal panel body 1a, 1
an electric circuit for driving b, 1c; 5, a frame of the image display device; a housing provided with an opening 5i above liquid crystal light valves 20a, 20b, 20c; 6, a light source; Projection lenses for enlarging and projecting the images of 1a, 1b, 1c, 8 are liquid crystal light valves 20a, 20b, 20c
The prism 9 for synthesizing the image of the above is electrically connected to the electric circuit 4, and the operation unit operated by the user to control the image display device. The operation of the operation unit 9 and the electric circuit 4 is electrically performed. The connecting cable 11 is a cover detachably attached to an opening 5 i provided in the housing 5. The illustrated housing 5 includes liquid crystal light valves 20a and 20a.
0b, 20c, electric circuit 4, light source 6, and prism 8,
In addition, it is configured so that a part of the projection lens 7 is accommodated therein.

In such a conventional projection type image display device, the liquid crystal light valves 20a, 20d are manufactured or manufactured during use.
In the case where dust is found to adhere to the cover 11b, the cover 11
By removing, the dust removal operation can be performed without opening the entire housing 5.

[0004]

The conventional projection type image display device is configured such that a large opening 5i is provided on the top surface of the housing 5 and the opening 5i is closed by the cover 11.
Subject to restrictions on appearance design, not good appearance, need large cover 11 and increase cost, noise (unwanted radiation) leaks from gap due to variation in fitting of opening 5i and cover 11, and NG (poor) There was a problem. A similar problem occurs when an image display element other than a liquid crystal light valve is used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has less restrictions on the external design of the outer surface of a projection type image display device without impairing the dust removal workability of the image display device. The purpose is to do.

Another object of the present invention is to provide a projection-type image display device with good appearance.

Another object of the present invention is to eliminate the need for a cover,
It is to reduce cost increase.

Another object of the present invention is to provide a projection type image display device which suppresses noise (unwanted radiation) and has high reliability.

[0009]

According to a first aspect of the present invention, there is provided a projection type image display device comprising: an image display element (20a, 20b, 20);
c) and the image display elements (20a, 20b, 20c)
A projection lens (7) for enlarging and projecting the image, an electric circuit (4) for driving the image display elements (20a, 20b, 20c), and the image display elements (20a, 20b, 20)
c), the electric circuit (4), and a part of the projection lens (7) are housed therein, and a housing (5) provided with an opening (5a) and at least a part of the opening (5a) An operating unit (9) occupied and detachably attached to the opening and electrically connected to the electric circuit (4).

According to a second aspect of the present invention, in the projection type image display device according to the first aspect, the opening is formed in a top plate of the housing.

According to a third aspect of the present invention, in the projection type image display device according to the first aspect, the operation unit (9) occupies the whole of the opening (5a), and the operation unit (9) is used only for the opening (5a). ) Is configured to be closed.

A projection type image display device according to a fourth aspect of the present invention is the projection type image display device according to the first aspect, further comprising a cover (11) detachably attached to the opening (5a), wherein the operation unit (9) is provided with the cover It is characterized by being mounted on (11).

According to a fifth aspect of the present invention, there is provided a projection type image display device, comprising: an image display element (20a, 20b, 20c); a projection lens (7) for enlarging and projecting an image of the image display element (20a, 20b, 20c). The image display elements (20a, 20
b, 20c), the image display elements (20a, 20b, 20c) and the electric circuit (4), and a part of the projection lens (7) are housed therein, and an opening ( 5b, 5d) and the image display element (20a, 5a) through the opening (5a, 5b).
20b, 20c) and a duct (1)
3).

According to a sixth aspect of the present invention, in the projection type image display device according to the fifth aspect, the opening (5b) is provided above the image display element.

According to a seventh aspect of the invention, in the projection type image display device according to the fifth aspect, the opening (5d) is provided below the image display element.

According to another aspect of the present invention, there is provided a projection type image display device, comprising: an image display element (20a, 20b, 20c); a projection lens (7) for enlarging and projecting an image of the image display element (20a, 20b, 20c). An electric circuit for driving the image display element, the image display elements (20a, 20b, 20c) and the electric circuit (4), and a part of the projection lens (7) are housed inside and below the image display element. Opening (5c,
5d) provided with the housing (5), and the opening (5c, 5c).
d) is detachably attached to the opening (5c, 5d)
(16, 14, 15).

According to a ninth aspect of the present invention, in the projection type image display device according to the eighth aspect, the opening (5c) substantially corresponds to the entirety of the image display elements (20a, 20b, 20c), and a cleaning tool is inserted and cleaned. It is characterized in that it has a size that enables dust removal work with a tool.

According to a tenth aspect of the present invention, in the projection type image display device according to the eighth aspect, the opening (5d) is provided with an air nozzle (1).
It is characterized by having a size that allows the insertion of 2).

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a top view schematically showing the internal structure of the projection display apparatus according to the first embodiment, and FIG.
FIG. 3 shows a method of removing dust from the liquid crystal light valve of the projection type image display device according to the first embodiment.

1 and 2, reference numerals 1a, 1b,
1c is an R, G, B liquid crystal panel body, 2a, 2b,
2c is an incident polarizer disposed on the incident side of the liquid crystal panel main bodies 1a, 1b, 1c, and 3a, 3b, 3c is an output polarizer disposed on the output side of the liquid crystal panel main bodies 1a, 1b, 1c, respectively. With these, the liquid crystal light valves 20a, 20
0b and 20c are formed. 4 is the liquid crystal panel body 1
a, 1b, 1c; an electric circuit for driving the liquid crystal light valves 20a, 20b, 2;
0c, a housing provided with an opening 5a at the top, 6 a light source, 7
Is a projection lens for enlarging and projecting the images of the liquid crystal light valves 20a, 20b, 20c, and 8 is a liquid crystal light valve 20a, 20b.
A prism for synthesizing the images of 20b and 20c, 9 is a housing 5
Of these, the liquid crystal light valves 20a, 20b, and 20c are removably mounted on openings 5a provided on the top plate 5p, that is, on the top plate 5p, and are electrically connected to the electric circuit 4 to control the image display device. The operation unit 10 operated by the user is a cable for electrically connecting the operation unit 9 and the electric circuit 4. The illustrated housing 5 is configured to house liquid crystal light valves 20a, 20b, 20c, an electric circuit 4, a light source 6, a prism 8, and a part of the projection lens 7 therein.

In the projection type image display apparatus thus constructed, the light generated by the light source 6 is decomposed into three colors of R, G and B by a dichroic mirror (not shown). 20a, 20b, 20c
At this time, the liquid crystal panel main bodies 1a, 1b, and 1c receive intensity modulation according to an image signal to be displayed, and then are synthesized by a prism 8 and projected on a display screen (not shown) by a projection lens 7.

The operation unit 9 is operated for controlling the image display device, such as changing display contents and adjusting brightness and color.

The liquid crystal panel bodies 1a, 1b, 1c, the input polarizers 2a, 2b, 2c, and the output polarizers 3a, 3b, 3
c, liquid crystal light valves 20a, 20b, 20
Since c is a portion through which light passes, if dust adheres to the portion, the projected image will be dark or unclear.

Liquid crystal light valves 20a, 20b, 20c
If dust is found on the liquid crystal panel main bodies 1a, 1b, 1c, the input polarizers 2a, 2b, 2c, and the output polarizers 3a, 3b, 3c, as shown in FIG. The operation unit 9 which is detachably attached to the main body is removed, and the air nozzle 12 is inserted through the opening 5a, so that the liquid crystal panel main bodies 1a, 1b, 1c and the incident polarizers 2a, 2 are inserted.
Air can be blown onto the b, 2c and the output polarizing plates 3a, 3b, 3c to remove dust.

As described above, the opening 5a is provided for cleaning the liquid crystal light valves 20a, 20b, 20c.
The upper portion 20c corresponds to the entirety thereof, and is configured to enable the insertion of the air nozzle 12 and the dust removal operation thereby. More specifically, the R, G, B liquid crystal panel main bodies 1a, 1b, 1 forming the liquid crystal light valves 20a, 20b, 20c with the air nozzle 12 inserted thereinto.
c, input polarizers 2a, 2b, 2c and output polarizers 3a,
By blowing air to 3b and 3c, it is possible to individually remove dust adhering to them.
That is, the tip 12a of the air nozzle 12 is connected to the R, G, and B liquid crystal panel bodies 1a, 1b, and 1c, and the incident polarizers 2a and 2
The size, the shape, and the position are determined so as to be directed to any one of b, 2c and the output polarizing plates 3a, 3b, 3c.

The operation unit 9 also serves as a cover for closing the opening 5a during normal times (other than when dust is removed). Therefore, the operation unit 9 is configured to correspond to the entire liquid crystal light valves 20a, 20b, 20c.

The operation unit 9 is inserted into the opening 5a of the housing 5.
As a method of detachably attaching the diaper, a snap-in as shown in FIGS. 2 and 3 (an elastic claw 9a capable of engaging with the opening is used to enable detachment by elastic deformation and a restoring force by elasticity). (Fixing method using a screw) or screwing or peelable adhesive.

In the first embodiment, the liquid crystal panel main bodies 1a, 1b, 2c, the input polarizers 2a, 2b, 2c, and the output polarizers 3a, 3b,
Although dust was removed by blowing air to 3c, the same effect can be obtained in the case of using a cleaning tool such as a method of sucking like a vacuum using an air nozzle or a method of removing dust using a cotton swab or the like. Is obtained.

Embodiment 2 FIG. 4 is a diagram showing a projection-type image display device according to the second embodiment, and is a cross-sectional view at the same position as that of the first embodiment shown in FIG. The device of this embodiment is the same as the device of FIG. 1 except that a cover 11 is detachably attached to the opening 5 a of the housing 5, and the operation unit 9 is attached to the cover 11. different. The operation unit 9 may be detachably mounted on the cover 11, or may be fixed so that it cannot be easily removed (a special tool is required for removal).

The size of the opening 5a is the same as that of the first embodiment, and the operation unit 9 is configured to occupy only a part of the opening 5a.

Liquid crystal light valves 20a, 20b, 20c
, Liquid crystal panel bodies 1a, 1b, 1c, incident polarizers 2a, 2b, 2c, and output polarizers 3a, 3b, 3c
When dust is found on the cover 5, the cover 11 detachably attached to the housing 5 is removed (the attached operation unit 9 is also removed along with the cover 11), thereby the same as in the first embodiment. Dust removal work can be performed.

As a method for detachably attaching the cover 11 to the opening 5a of the housing 5, snapping as shown in FIG. 4, screwing, or peelable adhesive may be used.

Embodiment 3 FIG. 5 is a diagram showing the projection-type image display device according to the third embodiment, and is a cross-sectional view at the same position as FIG. 2 for the first embodiment and FIG. 4 for the second embodiment.

The projection type image display device of the third embodiment is the same as that of the first or second embodiment. However, they differ in the following points. That is, in the above-described first and second embodiments, the housing 5 has the liquid crystal panel main bodies 1a, 1
b, 1c, the input polarizers 2a, 2b, 2c, and the output polarizers 3a, 3b, 3c, are provided with large openings 5a corresponding to the entirety thereof.
An air nozzle is inserted from above to enable dust removal work.

On the other hand, in the third embodiment, the housing 5 is formed with a relatively small opening 5b. This opening 5b
Is large enough to allow the air from the air nozzle 12 to pass therethrough. Inside the housing 5, through the opening 5b, the liquid crystal panel main bodies 1a, 1b, 1c, the incident polarizing plates 2a,
A duct 13 is provided to form a ventilation path toward 2b, 2c and the output polarizing plates 3a, 3b, 3c. As shown in FIG. 6, the opening 5b is normally closed by a detachable cap 14 formed of rubber, resin, or the like.

Liquid crystal light valves 20a, 20b, 20c
, Liquid crystal panel bodies 1a, 1b, 1c, incident polarizers 2a, 2b, 2c, and output polarizers 3a, 3b, 3c
If dust is found on the opening 5b, as shown in FIG.
Remove the cap 14 (FIG. 6) and pass through the opening 5b.
Air is sent from the air nozzle 12 and blown onto the liquid crystal panel main body 1, the incident polarizer 2, and the output polarizer 3 through a ventilation path in the duct 13. Thereby, the attached dust can be removed.

In this embodiment, the operation unit 9 is mounted on a portion of the top plate 5p of the housing 5 other than the opening 5b, and is electrically operated by a cable 10 extending through an opening 5h different from the opening 5b. It is connected to the circuit 4.

In the example shown in FIG. 6, the opening 5b is configured so as to be closed by a detachable cap 14 formed of rubber or resin, but as shown in FIG.
It has a screw hole 5e, and the screw portion 15a of the screw 15 is
e, and screw the head 15b of the screw 15 to the counterbore 5f.
, The opening 5b may be closed.

Embodiment 4 FIG. 8 is a diagram showing a projection-type image display device according to a fourth embodiment, and shows a cross section at the same position as FIG. 2 for the first embodiment, FIG. 4 for the second embodiment, and FIG. 5 for the third embodiment. FIG.

The projection type image display device of the fourth embodiment is the same as that of the first or second embodiment. However, they differ in the following points. That is, in Embodiments 1 and 2 described above, the housing 5 includes the liquid crystal light valve 20a,
Although the opening 5a is provided in the upper part of the top plate 20p, that is, in the top plate 5p, in the fifth embodiment, as shown in FIG.
a, 20b, 20c, that is, an opening 5c in the bottom plate 5s.
Is provided.

As described above, in the fifth embodiment, the opening 5c for dust removal is provided in the bottom plate 5s of the projection type image display device, and the opening 5c is normally closed by the removable cover 16. I have.

Liquid crystal light valves 20a, 20b, 20c
, Liquid crystal panel bodies 1a, 1b, 1c, incident polarizers 2a, 2b, 2c, and output polarizers 3a, 3b, 3c
If dust is found on the cover, the detachable cover 16 is removed, and an air nozzle is inserted from the opening 5c to perform dust removal work in the same manner as in the first and second embodiments. Can be.

For this reason, the opening 5c is similar to the opening 5a of the first embodiment and the like, and the liquid crystal panel main bodies 1a, 1b, 1c,
Incident polarizers 2a, 2b, 2c and outgoing polarizers 3a, 3
b, 3c, the size corresponding to the entirety of the liquid crystal panel body 1, the input polarizer 2, and the output polarizer 3 by inserting an air nozzle so that the tip 12a can be sequentially directed to each place. , Shape and position are determined.

As a method of detachably attaching the cover 16 to the opening 5c of the housing 5, snapping using an elastic claw 16a as shown in FIG.
Screwing or peelable adhesive may be used.

Embodiment 5 FIG. FIG. 9 is a diagram showing a projection-type image display device according to the fifth embodiment. FIG. 2 shows the first embodiment, FIG. 4 shows the second embodiment, FIG. 5 shows the third embodiment, and FIG. FIG. 9 is a cross-sectional view of FIG.

The projection type image display device of the fifth embodiment is the same as that of the third embodiment. However, they differ in the following points.
That is, in the above-described third embodiment, the housing 5 has the opening 5b above the liquid crystal light valves 20a, 20b, and 20c.
In the fourth embodiment, the liquid crystal light valve 20 is provided in the housing 5 as shown in FIG.
An opening 5d is provided at the lower part of the a, 20b, 20c, and inside the housing, the R, G, B liquid crystal panel main bodies 1a, 1b, 1c, the incident polarizers 2a, 2b, 2c, and the output polarized light are respectively provided from the opening 5d. A duct 13 is provided to form a ventilation path toward the plates 3a, 3b, 3c.

As in the third embodiment, the opening 5d is usually closed with a detachable cap 14 formed of rubber or resin as shown in FIG. 6 or a screw 15 as shown in FIG. I have.

Liquid crystal light valves 20a, 20b, 20c
, Liquid crystal panel bodies 1a, 1b, 1c, incident polarizers 2a, 2b, 2c, and output polarizers 3a, 3b, 3c
If dust is found on the liquid crystal panel 1, the cap is removed, air is sent from the air nozzle 12 through the opening 5d as shown in FIG. Blow air to Thereby, dust adhering to these can be removed.

In the above embodiment, the opening is provided in the top plate or the bottom plate. However, the present invention can be applied to a case where the opening is provided in another portion, for example, a side plate. Further, the present invention can be applied to a projection type image display device using an image display element other than the liquid crystal light valve used in the above embodiment.

[0050]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, since the operation unit is configured to occupy at least a part of the opening, the outer surface of the housing can be effectively used, and the operation can be performed when the opening is enlarged. The problem of having trouble arranging units does not occur. Further, since the operation unit is arranged in the opening cover, restrictions on the external design can be reduced and the appearance can be improved as compared with the conventional example in which the operation units are separately arranged.

According to the second aspect of the present invention, since the opening is formed in the top plate and the operation unit is disposed on the top plate side, operation of the operation unit and cleaning through the opening are easy.

According to the third aspect of the present invention, since the operation unit also functions as a cover for closing the opening, there is no need to provide a separate cover. Therefore, the cost of the apparatus can be reduced.

According to the fourth aspect of the present invention, the size of the operation unit and the size of the opening can be determined separately without restricting each other.

According to the fifth aspect of the present invention, the opening only needs to be large enough to allow the insertion of the air nozzle, and can be relatively small. Therefore, a cap may be used as the closing means, and the opening and closing means may be used. Can be constructed at low cost. Further, since the opening is small, restrictions on the external design can be reduced. Further, the possibility of noise leakage can be reduced.

According to the sixth aspect of the present invention, since the opening is on the upper side, the cleaning operation using the air nozzle is easy.

According to the seventh aspect of the present invention, since the opening is provided in the lower portion which is relatively invisible, the restriction on the appearance design of the top surface which is relatively invisible can be reduced. Also, restrictions on the arrangement of the operation units can be reduced.

According to the eighth aspect of the present invention, since the opening is provided at the lower part of the image display means, that is, at the bottom surface of the housing, restrictions on the appearance design of the top surface of the housing which is more noticeable than the bottom surface are reduced. Also, restrictions on the arrangement of the operation units are reduced.

According to the ninth aspect of the present invention, since the opening is large enough to allow the cleaning tool to be inserted, dust can be easily removed.

According to the tenth aspect of the present invention, the opening only needs to be large enough to allow the insertion of the air nozzle, and can be relatively small. Therefore, a cap may be used as the closing means, and the opening and closing means may be used. Can be constructed at low cost. Also,
Since the opening is small, restrictions on the external design can be reduced. Further, the possibility of noise leakage can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic top view showing a projection-type image display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the projection-type image display device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing how to remove dust from a liquid crystal light valve of the projection type image display device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a projection-type image display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a projection-type image display device according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating details of an example of an opening and a cap that closes the opening of the projection-type image display device according to the third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing details of another example of an opening and a cap for closing the opening of the projection-type image display device according to the third embodiment of the present invention.

FIG. 8 is a sectional view of a projection-type image display device according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a projection-type image display device according to a fifth embodiment of the present invention.

FIG. 10 is a top view showing a conventional projection type image display device.

FIG. 11 is a sectional view showing a conventional projection type image display device.

[Explanation of symbols]

1a, 1b, 1c Liquid crystal panel main body, 2a, 2b, 2
c Incident side polarizing plate, 3a, 3b, 3c Outgoing side polarizing plate,
4 circuits, 5 housings, 5a, 5b, 5c, 5d
Opening, 5p top plate, 5s bottom plate, 6 light sources, 7
Projection lens, 8 prisms, 9 operation units,
10 wiring cable, 11 top cover, 12
Air nozzle, 13 duct, 14 cap,
15 screws, 16 bottom cover.

Claims (10)

[Claims] An image display element (20a, 20b, 20
c); a projection lens (7) for enlarging and projecting the image of the image display element (20a, 20b, 20c); an electric circuit (4) for driving the image display element (20a, 20b, 20c); A housing (5) in which an image display element (20a, 20b, 20c), the electric circuit (4), and a part of the projection lens (7) are accommodated and an opening (5a) is provided; A projection type image display device having an operation unit (9) occupying at least a part of (5a) and detachably attached to the opening, and electrically connected to the electric circuit (4); . 2. The projection type image display device according to claim 1, wherein the opening is formed in a top plate of the housing. 3. The operation unit (9) occupies the entire opening (5a), and the opening (5a) is configured to be closed only by the operation unit (9). The projection type image display device according to claim 1. 4. A cover (11) removably attached to the opening (5a), wherein the operating unit (9) is mounted on the cover (11). Item 2. A projection type image display device according to item 1. 5. An image display device (20a, 20b, 20)
c); a projection lens (7) for enlarging and projecting the image of the image display element (20a, 20b, 20c); an electric circuit (4) for driving the image display element (20a, 20b, 20c); A housing (5) in which an image display element (20a, 20b, 20c), the electric circuit (4), and a part of the projection lens (7) are housed, and an opening (5b, 5d) is provided; From the openings (5a, 5b) through the image display element (20)
a, 20b, 20c), and a duct (13) for forming a ventilation path. 6. The projection type image display device according to claim 5, wherein said opening (5b) is provided above said image display element. 7. The projection type image display device according to claim 5, wherein the opening (5d) is provided below the image display element. 8. An image display element (20a, 20b, 20
c), a projection lens (7) for enlarging and projecting the image of the image display element (20a, 20b, 20c), an electric circuit for driving the image display element, and the image display element (20a, 20c).
(b, 20c), the electric circuit (4), and a housing (5) in which a part of the projection lens (7) is housed and an opening (5c, 5d) is provided below the image display element; Means (16, 14, 15) removably attached to the openings (5c, 5d) to close the openings (5c, 5d);
And a projection type image display device comprising: 9. The opening (5c) substantially corresponds to the whole of the image display element (20a, 20b, 20c), and has a size that allows a cleaning tool to be inserted and dust removed by the cleaning tool. 9. The projection type image display device according to claim 8, wherein: 10. The air nozzle (1) is provided with the opening (5d).
9. The projection type image display device according to claim 8, wherein the projection type image display device has a size that allows the insertion of (2).