JPH08304925A - Back transmission type projection television - Google Patents

Abstract

PURPOSE: To prevent a gap from being formed between a Fresnel lens screen and a lenticular screen constituting a screen attached to a back transmission type projection television. CONSTITUTION: In this back projection type projection television which is provided with a video source 5 housed in a cabinet 1, the screen 2 constituted by sticking the Fresnel lens screen 3 with the lenticular screen 4 and a fixing means fixing the screen 2 on the cabinet 1, and in which the screen 2 is attached to the front opening part of the cabinet 1 through the fixing means and projected light from the video source 5 is projected to the screen 2 as a magnified transmitted video; the cabinet 1 is provided with a surface having a specified gradient angle at a part in contact with the back surface of the screen 2, and the screen 2 is fixed on the surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection type projection television, and more particularly to a screen mounting structure.

[0002]

2. Description of the Related Art A rear transmissive projection television using a projection type television receiver has, for example, three CRTs that serve R, G, and B colors as image sources and three CRTs that enlarge the images of each CRT. The projection lens is used to project the image from the image source on the back surface of the screen, and the observer observes the transmitted image projected on the opposite side (front surface) of the screen to the image source. FIG. 12 is a sectional view showing a conventional rear transmissive projection television disclosed in Japanese Patent Publication No. 6-27921. In the figure, 1 is a cabinet, 1z is a front opening of the cabinet 1, 2 is a screen, 3 is a Fresnel lens screen and a lenticular screen which constitute the screen 2, 5 is an image source for projecting an image, and 6 is a screen 2. It is a screen frame that covers the peripheral portion. 7 is a reflection mirror, 8 is a back cover, 9 is an observer, 2a is a surface of the screen 2 on the image source 5 side, 2b is a viewer side surface, 10,
Reference numeral 11 denotes a projection type CRT and a projection lens which form the image source 5,
Reference numeral 5 is a fixture for fixing the screen, 16 is a mounting screw, and 20 is an adhesive tape.

The Fresnel lens screen 3 has a flat rear surface (image source side) but a concentric Fresnel lens surface on the front surface. The lenticular screen 4 has a lenticular lens surface, which is an arc-shaped convex curved surface, on its back surface, and has a black stripe surface formed by coating the top surface of the trapezoidal convex portion in black on the front surface (observer side). . Both the Fresnel lens screen 3 and the lenticular screen 4 are made of an acrylic resin material, and each of them is given a warp with a constant curvature in order to enhance the adhesion. The lenticular screen 4 is thinner than the Fresnel lens screen 3 and has a slightly smaller outer dimension. The screen 2 is formed by adhering the Fresnel lens screen 3 and the lenticular screen 4 with an adhesive tape 20 on the basis of the upper side of each.
It is attached to the front opening 1z of the cabinet 1 with a fixing member 15 and an attaching screw 16. Fixing bracket 15
Are attached to the outer periphery of the screen 2 with a slight gap between the upper side and the left and right sides so that the extension due to temperature rise is released. The fixture 15 attached to the peripheral portion of the screen 2 is covered by the screen frame 6.

Next, the mounting of the screen including the Fresnel lens screen 3 and the lenticular screen 4 and the cabinet will be described. FIG. 13 is a cross-sectional view of the screen of the conventional rear transmissive projection television and the upper and lower side mounting portions of the cabinet as viewed from the surface of FIG. In the figure, 22a and 22b are cushions having an adhesive portion on one surface and a fibrous portion on the other surface.

Conventionally, the mounting structure of the screen 2 and the cabinet 1 has been as described below. At the upper side of the screen 2, a cushion 22a is attached to the contact surface C with the fixing member 15 which is the front surface of the lenticular screen 4, and a cushion 22b is attached to the contact surface B with the cabinet 1 which is the back surface of the Fresnel lens screen 3. Then, the screen 2 is sandwiched between the cabinet 1 and the fixing fittings 15.

Further, like the upper side portion, the cushion 22a and the cushion 22 are provided on the front surface C of the lenticular screen 4 and the back surface B of the Fresnel lens screen 3 also on the lower side portion.
b is attached and is clamped to the cabinet 1 by using the fixing metal fittings 15. On the other hand, due to the weight of the screen 2,
The lower side of the screen 2 is placed in contact with the fixture 15,
Since the lenticular screen 4 has a smaller outer dimension than the Fresnel lens screen 3, only the Fresnel lens screen 3 is in contact with the fixing member 15.

In the conventional rear transmission type projection television as described above, the projection light projected from the projection type CRT 10 of the image source 5 is magnified through the projection lens 11 and is reflected by the reflection mirror 7. The projected light thus projected is projected on the surface 2a of the screen 2. The observer 9 can observe the transmission image projected on the 2a surface of the screen 2 from the 2b surface side.

[0008]

In the conventional rear transmissive projection television as described above, when the screen is attached to the front opening of the cabinet, a gap is created between the Fresnel lens screen and the lenticular screen which form the screen. Sometimes. This is probably because the screen became thin and the rigidity of the lenticular screen decreased. There is a problem that the image quality is deteriorated due to the distortion of the image due to the formation of the gap in the screen.

Further, both the Fresnel lens screen and the lenticular screen, which compose the screen, are made of an acrylic resin as a raw material and easily expand and contract due to changes in the environment such as temperature and humidity. There may be a gap between the lens screen and the lenticular screen. There is a problem that the image quality is deteriorated due to the distortion of the image due to the formation of the gap in the screen. Furthermore, since the screen 2 is in contact with the fixing metal fitting 15 at the lower side portion, a gap generated between the Fresnel lens screen 3 and the lenticular screen 4 due to expansion and contraction of the Fresnel lens screen 3 and the lenticular screen 4 due to a change in the environment, Due to the weight of the screen 2, the screen 2 is partially deformed to the back side in a convex shape, and at the deformed portion,
The gap between the Fresnel lens screen 3 and the lenticular screen 4 which are in close contact with each other is further increased,
There is also a problem that a remarkable image distortion occurs, which deteriorates the quality.

Further, in the conventional rear transmission type projection television, in the case of a large screen of 60 inches and 70 inches, the weight of the screen becomes excessively large as compared with that of 45 inches and 50 inches, so that the screen 2 is caused by vibration during transportation. There is a drawback that the Fresnel lens screen 3 is cracked or chipped at the contact portion between the lower side portion and the fixing member 15 and the screen is broken, and the quality is deteriorated.

The present invention has been made in order to solve the above problems. A first object of the present invention is to install a screen between a Fresnel lens screen and a lenticular screen constituting the screen when the screen is attached to a cabinet. A rear transmissive projection television capable of preventing a gap. A second object is to obtain a rear transmissive projection television capable of preventing a gap generated between a Fresnel lens screen and a lenticular screen caused by a change in environment such as temperature and humidity.

A third object is to prevent the gap between the Fresnel lens screen and the lenticular screen, which is caused by the weight of the screen, from increasing without being changed by environmental changes such as temperature and humidity. To obtain a transparent rear projection TV. A fourth object is to obtain a rear transmission type projection television capable of preventing the screen, especially the Fresnel lens screen, from being broken during transportation.

[0013]

According to a first aspect of the present invention, there is provided a rear transmissive projection television which comprises an image source housed in a cabinet, a screen formed by laminating a Fresnel lens screen and a lenticular screen, and the screen being the cabinet. In a rear transmission type projection television that is attached to the front opening of the projector by the fixing means and projects the projection light from the image source as an enlarged image on the screen, the front opening of the cabinet is a portion that contacts the back of the screen. Is provided with a surface having a predetermined inclination angle.

In the cabinet of the rear transmission type projection television according to the second invention, the front opening portion of the screen has a contact portion with the Fresnel lens screen.
The screen is provided with a surface having an inclination angle depending on the size of the screen from the outer surface to the inner surface direction.

The cabinet of the rear transmissive projection television according to the third aspect of the present invention is provided with a surface having a predetermined inclination angle on the upper side and the lower side of the front opening of the screen in contact with the Fresnel lens screen. It is a thing.

The cabinet of the rear transmission type projection television according to the fourth aspect of the present invention is provided with a surface having a predetermined inclination angle on the left side portion and the right side portion of the portion of the screen of the front opening which comes into contact with the Fresnel lens screen. It is a thing.

The cabinet of the rear transmissive projection television according to the fifth aspect of the present invention is provided with a surface having a predetermined inclination angle on the upper, lower, left and right sides of the front opening of the screen which is in contact with the Fresnel lens screen. It is a thing.

The cabinet of the rear transmissive projection television according to the sixth aspect of the present invention is provided on the upper and lower sides and the left and right sides of the front opening of the screen in contact with the Fresnel lens screen. The slope angle of the curved surface is different.

In the rear transmission type projection television according to the seventh aspect of the present invention, the cabinet of the rear opening type projection television has a predetermined inclination angle formed by the surfaces provided on the upper and lower sides of the portion of the screen which is in contact with the Fresnel lens screen. On the other hand, the slope angles of the surfaces provided on the left and right sides are reduced.

A rear transmission type projection television according to an eighth aspect of the present invention includes an image source housed in a cabinet,
A screen formed by laminating a Fresnel lens screen and a lenticular screen, and the screen is attached to the front opening of the cabinet by a fixing means, and the rear transmission type projection television projecting the projection light from the image source as an enlarged image on the screen. In the above, the screen is fixed to a portion of the screen in contact with the Fresnel lens screen and the front opening of the cabinet, and is suspended from the cabinet at the fixing portion.

The screen of the rear transmissive projection television according to the ninth aspect of the invention is fixed to the front opening of the cabinet through the fixing means, and the lower side of the fixing means does not come into contact with the lower end thereof. The fixed portion is suspended in the cabinet.

[0022]

In the rear transmissive projection television according to the first aspect of the present invention, the surface of the front opening of the cabinet that contacts the back surface of the screen is provided with a surface having a predetermined inclination angle, and the screen has the predetermined inclination angle. By fixing along the surface, it works so as to maintain the constant curvature given to the screen, and the screen can be fixed while the warp given to the screen is held.

In the rear transmissive projection television according to the second aspect of the present invention, a surface having a slope angle corresponding to the size of the screen is provided in a portion of the front opening of the cabinet which is in contact with the Fresnel lens screen. Therefore, it is possible to fix screens of various sizes while keeping the screen warp.

A rear transmissive projection television according to a third aspect of the present invention is a cabinet in which a surface having a predetermined inclination angle is provided on an upper side portion and a lower side portion of a front opening portion of the cabinet which is in contact with the Fresnel lens screen. Since the screen can be fixed while the warp of the screen is held by fixing the screen by using, the adhesion between the Fresnel lens screen and the lenticular screen forming the screen is improved.

A rear transmissive projection television according to a fourth aspect of the present invention is a cabinet in which a surface having a predetermined inclination angle is provided on a left side portion and a right side portion of a front opening portion of the cabinet which is in contact with the Fresnel lens screen. By fixing the screen using, it is possible to cope with the warp in the left-right direction of the screen that occurs when the screen is attached to the cabinet.

A rear transmissive projection television according to a fifth aspect of the present invention is a cabinet in which a surface having a predetermined inclination angle is provided on the upper, lower, left and right sides of a portion of the front opening of the cabinet in contact with the Fresnel lens screen of the screen. By fixing the screen by using the screen, the screen can be fixed while being warped by being applied to the screen, and the adhesiveness between the Fresnel lens screen and the lenticular screen forming the screen can be maintained.

In the rear transmissive projection television according to the sixth aspect of the present invention, the surfaces provided on the left and right sides of the front opening of the cabinet and the surfaces provided on the upper and lower sides have different inclination angles. The warp imparted to the screen can be maintained and the screen can be fixed with the optimum screen shape.

In the rear transmissive projection television according to the seventh aspect of the present invention, the right and left side portions have the inclination angle of the surface provided in the front opening of the cabinet and having the predetermined inclination angle with respect to the angle of the upper and lower side portions. By making the angle smaller,
When fixing the screen, the horizontal warp of the screen can be fixed in a state smaller than the vertical warp.

In the rear transmissive projection television according to the eighth aspect of the invention, the screen is fixed and suspended at the upper side of the front opening of the cabinet, so that the screen is hung in a state of being suspended from the upper side of the cabinet. ing.

In the rear transmission type projection television according to the ninth aspect of the invention, the upper side of the screen is fixed in a state of being suspended from the cabinet, and the lower side of the screen is fixed to the cabinet without the lower end of the screen contacting the fixing metal fitting. The screen is hung on the top edge of the cabinet.

[0031]

【Example】

Example 1. An embodiment of the present invention will be described below. FIG. 1 is a perspective view of a rear transmissive projection television which is an embodiment of the present invention. FIG. 2 is a cross-sectional view of the rear transmissive projection television from the side. It should be noted that 2 to 5 and 7 to 11 shown in the figure are the same as those in the above-mentioned conventional example, and the description thereof will be omitted. In the figure,
1a is a cabinet for fixing the screen, and 1z is a front opening of the cabinet 1. As will be described later, a slope is provided in the front opening 1z portion which comes into contact with the surface of the screen 2 on the 2a side.

FIG. 3 is a cross-sectional view of an attachment portion of the rear transmissive projection television to the cabinet 1a at the upper side portion of the screen 2 when viewed from the side. In the figure, 15 is a fixing member for fixing the screen 2 to the cabinet 1a, and 16 is a fixing member 15 for the cabinet 1a.
, A surface A is an upper surface of the cabinet 1a, a surface B is a contact surface between the cabinet 1a and the lenticular screen 4, a surface C is a contact surface between the Fresnel lens screen 3 and the fixture 15, and an E is a perpendicular line of the surface A. , D are angles formed by the perpendicular E and the surface B, and are inclination angles of the inclinations provided in the contact portion of the cabinet 1a with the screen 2. Reference numeral 20 is an adhesive tape, and 22a and 22b are cushions having a fibrous portion on one surface opposite to the adhesive portion.

Next, how the screen 2 is fixed to the cabinet 1a will be described. As shown in FIG. 3, at the upper side, the cushions 2 are provided on the surfaces B and C of the screen 2.
2a and 22b are attached, and the screen 2 is crimped and clamped by the fixing metal fitting 15 from the surface C and from the surface B by the cabinet 1a. The fixture 15 is fixed to the cabinet 1a with screws 16. Further, the cushions 22a and 22b are attached to the surface B and the surface C of the screen 2 at the lower side, similarly to the upper side, but the front opening 1z of the cabinet 1a is a cabinet along a normal perpendicular line E. , And is clamped by the fixing bracket 15. The cushions 22a and 22b are the screen 2
And fixing bracket 15 or screen 2 and cabinet 1a
It is attached to alleviate contact with, but may not be attached. In this case, the screen 2 is directly crimped and fixed by the fixing member 15.

FIG. 4 is a diagram comparing the screen mounting states when the portion where the Fresnel lens screen surfaces of the cabinet 1 and the screen 2 contact each other is a flat surface and when a surface having a predetermined inclination angle is provided. Figure 4 (a)
As you can see, the screen fixed to a flat surface without an angle acts as an external force to move the cabinet from the cabinet to the flat surface, and the warp applied to the screen cannot be maintained. , The screen is deformed unnaturally. However, when the screen is fixed in a cabinet provided with a surface having a predetermined inclination angle as shown in FIG. 4B, an external force acts on the screen from the cabinet due to the inclination angle in the vicinity of the contact portion between the cabinet and the screen. The screen is not deformed and the lenticular screen and the Fresnel lens screen are not peeled off to form a gap.

In the conventional cabinet, since the contact surface between the screen and the cabinet is at a right angle (there is no slope in the contact surface), even though the screen is uniformly warped, especially the lenticular screen is in contact with the contact surface. It will be forced to follow. This uniform warp is originally provided to enhance the adhesion between the lenticular screen and the Fresnel lens screen. However, when the external force is applied from the cabinet to the screen in which the uniform warp is maintained as described above, the uniformity is partially lost (especially at the contact part between the cabinet and the screen), and the lenticular screen and the Fresnel lens are partially lost. The adhesion with the screen is weakened.

Therefore, by using a cabinet provided with a surface having a predetermined inclination angle, it is possible to maintain the adhesion between the lenticular screen and the Fresnel lens screen, which constitutes the screen, by removing the external force transmitted from the cabinet to the screen. . Further, the screen may be partially deformed by the external force from the cabinet. This is considered to be the residual stress of the screen, but even in such a case, it is possible to mitigate the partial deformation by using the inclined cabinet.

In the rear transmissive projection television having the above-mentioned structure, the screen 2 is fixed to the cabinet 1a with a certain degree of warp by providing a slope on the contact surface between the cabinet 1a and the screen 2. It will be. Therefore, the Fresnel lens screen 3 and the lenticular screen 4 that form the screen 2 retain the warp applied in advance, so that the Fresnel lens screen 3 and the lenticular screen 4 are in close contact with each other and no gap is formed. Furthermore, since the Fresnel lens screen 3 comes to be uniformly pressed against the lenticular screen 4 by its own weight,
Even if the screen 2 expands and contracts due to changes in environment such as temperature and humidity, the Fresnel lens screen 3 and the lenticular screen 4 expand and contract along the gradient, so there is no gap between them.

Example 2. Another embodiment of the present invention will be described below. The present embodiment relates to the slope angle of the surface B provided on the cabinet. The Fresnel lens screen 3 and the lenticular screen 4 forming the screen 2 are provided with a warp having a constant curvature in order to improve the adhesion between them. In this embodiment, a gradient having a gradient angle D suitable for the above-mentioned constant curvature is applied to the contact surface B with the screen 2 of the cabinet 1a.

The gradient angle D applied to the surface B of the cabinet 1a can be obtained by the following method. FIG. 5 is a view showing a cross section of the screen 2. In the figure, O is the center of curvature, straight line OA is the radius of curvature R, arc ACB is the length L of the screen in the height (or width) direction, ∠AOC is the inclination angle θ, and straight line DC is the amount of warpage d. From FIG. 3, the warp amount d,
The relationship between the radius of curvature R and the screen length L is expressed by equation (1). d + Rcos (L / (2R)) = R (1) When this equation is solved for the radius of curvature R, R≈L ² / (8d) (2) The gradient angle θ is θ = cos ^{− 1} ((R-d) / R) ... (3). From the equations (2) and (3), the gradient angle θ is represented by θ = cos ⁻¹ (1-8 (d / L) ² ) (4) using the warp amount d and the screen length L. .

For example, in the case of a 70-inch screen, the length L of the screen in the height direction is 1090 mm and the warpage d is 50.
The gradient angle θ in mm is as follows using the equation (4). θ = cos ⁻¹ (1-8 (50/1090) ² ) = 10.5 °

Similarly, in the case of a 60-inch screen, the length L of the screen in the height direction is 940 mm, and the warpage d =
When the equation (4) is used with a value of 50 mm, the gradient angle θ is θ = cos ⁻¹ (1-8 (50/940) ² ) = 9.2 °.

Further, in the case of a 45-inch screen, when the length L of the screen in the height direction is L = 705 mm and the warp d = 50 mm, the gradient angle θ is θ = cos ⁻¹ (1-8 ( 50/705) ² ) = 16.3 °.

By calculating the gradient angle in this way,
It is possible to provide an optimum slope for maintaining the warped state of the screen on the contact surface B between the cabinet 1a and the screen 2 according to the warp of the constant curvature given to the screen 2. Further, since the screen 2 is fixed by the surface B having the optimum inclination angle, the cabinet 1a works to hold the warp of the screen 2 and no gap is generated between the Fresnel lens screen 3 and the lenticular screen 4. Further, even when the screen expands and contracts due to environmental changes such as temperature and humidity, the screen 2 expands and contracts to maintain the warp due to the above-mentioned gradient, so that a gap is generated between the Fresnel lens screen 3 and the lenticular screen 4. There is no.

Example 3. Another embodiment of the present invention will be described below. FIG. 6 shows a cabinet 1 with a slope
FIG. 2 is a cross-sectional view taken along the line YY ′ in FIG. 1 when the upper side and the lower side of the screen 2 are fixed by using a.

Next, the screen 2 on the cabinet 1a
The attachment will be described. The cabinet 1a includes a Fresnel lens screen 3 and a lenticular screen 4.
To secure the screen 2 consisting of
The surface B where the Fresnel lens screen 3 and the cabinet 1a contact each other has a slope. In this embodiment,
A surface having this slope is provided on the surface where the upper side and the lower side of the screen 2 come into contact with the cabinet 1a.
Is used to press and fix the surface of the screen 2 to the contact surface B of the cabinet 1a. Therefore, the warp imparted to the screen 2 can be attached to the cabinet 1a in a state where the warp is maintained.

As described above, in this embodiment, the above-mentioned second embodiment is used.
Since the cabinet 1a has a configuration in which a gradient is given to the surface B of the contact portion where the cabinet 1a comes into contact with the screen 2 on the two sides of the upper side contact portion and the lower side contact portion of the cabinet 1a, the cabinet 1a is in contact with both upper and lower sides. Screen 2
It works so as to keep the warp, and no gap is created between the Fresnel lens screen 3 and the lenticular screen 4. Further, even when the screen 2 expands and contracts due to changes in the environment such as temperature and humidity, the screen 2 expands and contracts so as to maintain the warp due to the above-mentioned gradient, so that there is a gap between the Fresnel lens screen 3 and the lenticular screen 4. It never happens.

Example 4. Another embodiment of the present invention will be described below. In the third embodiment, the upper and lower side contact portions of the cabinet 1a with the screen 2 are provided with a slope, but in the present embodiment, the cabinet 1b having a slope is provided.
Is applied to the left and right sides of the screen 2 to fix the screen 2. FIG. 7 is a cross-sectional view showing a mounting state on the left and right sides of the screen 2 and the cabinet 1b, which is taken along the line XX 'in FIG. further,
The upper part of FIG. 7 corresponds to the front surface of the rear transmissive projection television. In the figure, 1b is the front surface (2a side) of the screen 2 when attached to the left and right sides of the screen 2.
It is a cabinet 1b having a slope on the surface that contacts with.

Next, the mounting structure will be described. On the left and right sides of the screen 2, a cushion 22b is attached to a portion that comes into contact with the cabinet 1b having a slope, and a cushion 22a is attached to a portion that comes into contact with the fixing fitting 15. The screen 2 consisting of the Fresnel lens screen 3 and the lenticular screen 4 is the fixing metal fitting 1
It is crimped and fixed to the cabinet 1b by 5.
In this embodiment, the upper side and the lower side of the screen 2 are attached to the cabinet 1 having a flat attachment surface. Therefore, the warp in the height direction given to the screen 2 also causes the warp in the width direction by being attached to the cabinet 1.

Therefore, the screen 2 due to the warp in the width direction
Let us consider the gradients that occur on the left and right sides of. For example, in the case of a 70-inch screen, the width direction length L = 14
Assuming 46 mm and the warp amount d = 50 mm, according to the formula (4), the screen 2 is the contact portion on the left and right sides with the cabinet 1, and θ = cos ⁻¹ (1-8 (50/1446) ² ) = 7.9 ° A gradient of

In the case of a 60-inch screen, assuming that the length L in the width direction is 1246 mm and the amount of warpage is d = 20 mm, θ = cos ^-1 (1-8 (20/12246) ) ² ) = 3.7 ° gradient occurs.

In the case of a 45-inch screen, assuming that the length L in the width direction is 935 mm and the amount of warpage is d = 20 mm, θ = cos ⁻¹ (1-8 (20/935) in the right and left side contact portions is obtained from equation (4). ) ² ) = 4.9 degree gradient occurs.

Therefore, by providing the left and right side contact portions between the screen 2 and the cabinet 1b with the gradient calculated as described above, the cabinet 1 can work to keep the warp of the screen 2 in the width direction. Further, even if the screen 2 expands and contracts due to changes in the environment such as temperature and humidity, the screen 2 is fixed by the cabinet 1b in a state of holding the warp.
Does not extend between the Fresnel lens screen 3 and the lenticular screen 4 because it expands and contracts along the gradient of the cabinet 1.

Example 5. Another embodiment of the present invention will be described below. In the third and fourth embodiments, the upper and lower sides of the cabinet 1 and the left and right side contact portions with the screen 2 are provided with a gradient, but in the present embodiment, the gradient is provided over the entire contact portion between the cabinet 1c and the screen 2. Is given. That is, the screen 2 is fixed at the upper and lower sides by the cabinet 1a and at the left and right sides by the cabinet 1b. The cabinet 1c is provided with sloped surfaces on the top, bottom, left and right sides where the back surface of the screen and the cabinet 1 come into contact. Further, in the cabinet 1c, a portion where the upper and lower side portions of the screen 2 come into contact with each other is designated as 1a, and a portion where the left and right side portions thereof come into contact with each other is designated as 1b.
FIG. 8 is a diagram showing a state in which the screen 2 is attached to the cabinet 1c. As shown in the figure, the screen 2 is fixed in a warped state.

As described above, the screen 2 is attached to the cabinet 1a having a slope on the upper and lower sides, and the cabinet 1b having a slope is also fixed on the left and right sides. Therefore, since the cabinet 1c works to hold the warp of the screen 2 on the four sides,
No gap is created between the Fresnel lens screen 3 and the lenticular screen 4. Also, the temperature
Even if the screen 2 expands or contracts due to a change in environment such as humidity, the screen 2 expands or contracts to maintain the warp due to the above-mentioned gradient, so that no gap is generated between the Fresnel lens screen 3 and the lenticular screen 4.

Next, a case will be described in which the slope angle of the slope provided on the contact surface where the screen frame contacts the screen is different between the upper and lower sides and the left and right sides. FIG. 9 is an application of a cabinet in which surfaces having predetermined inclination angles are provided on the four sides of up, down, left and right. Cabinet 1a on the upper and lower sides
The inclination angles of the surfaces of the cabinets 1b on the left and right sides in contact with the outer surface of the screen 2 can be appropriately determined. In FIG. 9, the gradient angle of the gradient provided on the left and right sides (1b) is made smaller than the gradient angle of the gradient provided on the upper and lower sides (1a) of the cabinet.

For example, when the size of the screen is 60 inches, the length in the height direction is 940 mm and the length in the width direction is 1.
It is 246 mm. When the screen warp d = 50 mm, the radius of curvature in the length direction and the radius of curvature in the width direction are naturally different. That is, the height direction is closer to the spherical surface than the width direction. Also,
It can be seen that the gradient angle in each screen size is smaller in the width direction than in the height direction as determined in Examples 2 and 4. That is, the gradient angles of the upper and lower sides of the screen frame and the gradient angles of the left and right sides of the screen frame have different values. Further, by making the slope angles of the left and right sides smaller than the slope angles of the upper and lower sides, it is possible to maintain the warp imparted to the screen and fix the screen while maintaining the original shape of the screen. Thereby, the Fresnel lens screen 3 and the lenticular screen 4 which compose the screen 2 are provided.
It is possible to maintain close contact with the screen 2, and it is possible to prevent the screen 2 from being deformed or peeled off, or from forming a gap. Further, since the screen is fixed by the cabinet while maintaining a more ideal shape, it is possible to suppress the distortion when the image is viewed from the side and widen the viewing angle.

Next, examples of diversion of the present invention to other uses will be shown.
FIG. 10 is a sectional view of a rear transmissive projection television using a liquid crystal projector as an image source. In the figure, 12 is a liquid crystal projector, and 13 is a projection lens. In the above description, the rear transmissive projection television of the present invention has been described for the case where the projection CRT 10 is used as the image source 5, but the rear transmissive projection television using the liquid crystal projector 12 instead of the projection CRT 10 is also used. It goes without saying that you can do it.

Example 6. Another embodiment of the present invention will be described below. The present embodiment is intended to prevent cracking or chipping of the Fresnel lens screen that constitutes the screen, which is caused by vibration during transportation of the projection television. 11 is a cross-sectional view of the upper and lower sides of the screen 2 attached to the cabinet 1, which is indicated by Y- in FIG.
It is a cross section of Y '. In the figure, a surface A is an upper surface of the cabinet 1, a surface B is a contact surface between the cabinet 1 and the lenticular screen 4, 20a is an adhesive tape for attaching the Fresnel lens screen 3 and the lenticular screen 4,
20b is a contact surface B for contacting the screen 2 with the screen frame 6a.
It is an adhesive tape to be attached to. Here, an adhesive tape is used as the adhesive member, but any elastic adhesive member can be used, and a rubber adhesive or a silicone adhesive can also be used.

Next, the mounting structure of the screen 2 and the cabinet 1 will be described. The screen 2 is composed of a Fresnel lens screen 3 and a lenticular screen 4, and the Fresnel lens screen 3 and the lenticular screen 4 have an adhesive tape 20 based on their upper sides.
It is glued with a. As shown in FIG. 11, the screen 2 (the surface of the lenticular screen 4) is the contact surface B at the upper side attachment portion of the screen, and the cabinet 1 and the adhesive tape 2 are attached.
It is adhered by 0b. Further, a cushion 22a is attached to the back surface C of the screen 2 (the back surface of the Fresnel lens screen 3), and the screen 2 is crimped by the fixing fitting 15 on the back surface C. That is, the screen 2 is attached to the cabinet 1 on the surface B with the adhesive tape 20b in the state where the upper bottom of the screen 2 is in contact with the upper end of the fixing bracket 15, and is further crimped from the rear surface C by the fixing bracket 15 at the upper edge mounting portion. And is held in a suspended state.

Further, in the lower side mounting portion of the screen 2,
A cushion 22b is attached to the contact surface B of the lenticular screen 4 with the cabinet 1 instead of the adhesive tape 20. The screen 2 is crimped to the contact surface with the cabinet 1 by a fixing member 15. Further, since the screen 2 is suspended (suspended in a hanging state) at the upper side portion, it does not contact the lower end portion of the fixing fitting 15. Since the adhesive tape is a tape having a strong adhesive force, it does not shift and can sufficiently withstand vibration during transportation.

In the rear transmissive projection television thus constructed, the screen 2 is suspended on the cabinet 1 by the adhesive tape 20b at the upper side thereof, so that the Fresnel lens screen 3 is fixed at the lower side of the screen 2. There is no contact with the metal fitting 15. Therefore, the Fresnel lens screen 3 does not come into contact with the screen frame 6 at its lower side due to the vibration during transportation, and breakage such as cracks and defects does not occur and the quality does not deteriorate. By the way, the screens of the rear transmission type projection televisions shown in Examples 1 to 6 have an aspect ratio of 4: 3, but it goes without saying that the present invention can be applied even when the screen has a laterally long aspect ratio such as 16: 9. Further, the present invention can be applied even when the screen is vertically long. Further, the lengths of the upper, lower, left and right sides of the screen can be set arbitrarily.

In the embodiment, the surface of the cabinet having the predetermined inclination angle forms a flat surface on one side of the cabinet, but it should be fitted to the side of the screen which is curved in the normal state. The shape may be curved with a predetermined gradient angle. Further, there is no problem even if the surface of the cabinet having a predetermined angle of inclination is curved so that the stress of the screen attached to the cabinet becomes uniform. Further, the surface where the cabinet and the screen are in contact with each other may have a predetermined slope angle changed according to the curved shape of the screen. Also, when fixing the screen with the cabinet, the slope of the contact surface between the screen and the cabinet near the corner (corner part) of the cabinet is compared to the center part so that it is fixed in a shape close to the original shape of the screen. You can loosen it. Further, although the screen is suspended on the upper side of the cabinet, the left and right sides may be fixed instead of the upper side. Also, although fixing metal fittings are used as means for fixing the screen to the cabinet, the fixing means need not be metal fittings.
It suffices if the screen can be pressed onto the cabinet, and for example, a molded product such as plastic can be used.

[0063]

According to the rear transmissive projection television of the first aspect of the present invention, a surface of the cabinet having a predetermined inclination angle is provided at a portion in contact with the back surface of the screen, and the screen has a surface having the predetermined inclination angle. By holding the screen along with, it is possible to fix the screen in a state where the warp applied to the screen is held, and it is possible to prevent the screen from being deformed by its own weight or deformed by changes in temperature and humidity. Further, it is possible to suppress the gap generated between the Fresnel lens screen and the lenticular screen that form the screen.

According to the rear transmission type projection television of the second aspect of the present invention, by providing the surface of the cabinet, which has a slope angle corresponding to the size of the screen, in the portion in contact with the Fresnel lens screen constituting the screen, It is possible to fix screens of various sizes while maintaining the warp imparted to the screens. In addition, since it is fixed to the cabinet while holding the warp imparted to the screen, it is possible to prevent deformation due to the weight of the screen and deformation due to changes in temperature and humidity, and it is also possible to use a Fresnel lens screen and a lenticular screen. It is possible to suppress the gap generated between the two and to prevent cracks, chips, etc., which occur in the Fresnel lens screen due to vibration during transportation.

According to the rear transmission type projection television of the third aspect of the invention, a cabinet having a surface having a predetermined inclination angle at a portion in contact with the Fresnel lens screen forming the screen is provided at the upper side and the lower side of the screen. By fixing by using the screen, the screen can be fixed in a state in which the warp of the screen is held, and therefore, it becomes possible to maintain the close contact between the Fresnel lens screen and the lenticular screen that form the screen.

According to the rear transmissive projection television of the fourth invention, the upper side of the screen is fixed to the cabinet, and the left side and the right side of the portion where the cabinet and the Fresnel lens screen constituting the screen contact each other. By using a cabinet that has a surface with a predetermined angle of inclination, it is possible to deal with the warp in the width direction that occurs when the screen is fitted into the cabinet, and the generated warp is maintained. The screen is fixed in this state. Therefore, the adhesion between the Fresnel lens forming the screen and the lenticular screen can be maintained.

According to the rear transmissive projection television of the fifth aspect of the invention, the cabinet is provided with the surfaces having a predetermined inclination angle on the upper, lower, left and right sides where the cabinet and the Fresnel lens screen constituting the screen are in contact. With this, the screen can be fixed while the warp applied to the screen is held, and the adhesion between the Fresnel lens and the lenticular screen that form the screen can be maintained. In addition, since the screen can be fixed while it is warped, it can be prevented from being deformed by the screen's own weight or by temperature / humidity changes, and can also suppress the gap between the Fresnel lens screen and the lenticular screen. You can Further, it is possible to prevent cracks, chips, and the like that occur in the Fresnel lens screen due to vibration during transportation.

According to the rear transmission type projection television in accordance with the sixth aspect of the present invention, the screens provided on the left and right sides of the cabinet and the sides provided on the upper and lower sides have different inclination angles, thereby making The warp imparted to the can be maintained and the screen can be fixed with the optimum screen shape.

According to the rear transmissive projection television of the seventh aspect of the present invention, the right and left side surfaces of the cabinet have a predetermined inclination angle with respect to the angle of the upper and lower side surfaces. By reducing the angle held by, the warp in the left-right direction of the screen can be made smaller than the warp in the up-down direction, so that the warp imparted to the screen can be held and fixed in a more ideal shape. In addition, it is possible to suppress distortion when the image is viewed from the side, and it is possible to widen the viewing angle.

According to the rear transmissive projection television of the eighth invention, since the screen is fixedly suspended at the upper side of the cabinet and suspended, the Fresnel lens screen is deformed by its own weight or vibrated during transportation. It is possible to prevent cracks, chips, etc. that occur in the.

According to the rear transmissive projection television of the ninth invention, the screen is fixed at the upper side of the cabinet, and the lower side of the screen is suspended so as not to come into contact with the fixing bracket. It is possible to prevent deformation of the Fresnel lens screen due to its own weight and cracks and chips that occur in the Fresnel lens screen due to vibration during transportation.

[Brief description of drawings]

FIG. 1 is a perspective view of a rear transmissive projection television.

FIG. 2 is a cross-sectional view of a rear transmissive projection television viewed from the side.

FIG. 3 is a cross-sectional view showing a mounting structure of an upper side portion of a screen and a cabinet.

FIG. 4 is a sectional view showing a mounting structure of a cabinet and a screen.

FIG. 5 is a diagram showing a relationship between a screen and a radius of curvature.

FIG. 6 is a cross-sectional view showing the attachment structure of the upper and lower sides of the screen and the cabinet.

FIG. 7 is a cross-sectional view showing a mounting structure on the left and right sides of the screen and the cabinet.

FIG. 8 is a view showing a shape of a screen to which a cabinet is attached.

FIG. 9 is a diagram showing a mounting structure of upper, lower, left and right sides of a screen and a cabinet.

FIG. 10 is a cross-sectional view of a rear transmissive projection television showing an example of diversion to another application of the present invention.

FIG. 11 is a view showing a mounting structure of the screen and the upper and lower sides of the cabinet.

FIG. 12 is a side sectional view of a conventional rear transmissive projection television.

FIG. 13 is a cross-sectional view showing a mounting structure of a screen of a conventional rear transmissive projection television and upper and lower sides of a cabinet.

[Explanation of symbols]

1. Cabinet 1z. Front opening 2. Screen 3. Fresnel lens screen 4. Lenticular screen 5. Video source 6. Screen frame 7. Reflective mirror 8. Back cover 9. Observer 10. Projection type CRT 11. Projection lens 12. Liquid crystal projector 13. Projection lens 15. Fixing bracket 16. Screw 20. Adhesive tape 22. cushion

Claims (9)

[Claims] 1. A video source housed in a cabinet,
A screen formed by laminating a Fresnel lens screen and a lenticular screen, and a fixing means for fixing the screen to the cabinet, the screen being attached to the front opening of the cabinet via the fixing means, In a rear transmissive projection television that projects projection light as an enlarged transmissive image on the back surface of the screen, the rear transmissive projection television is characterized in that the cabinet has a surface having a predetermined inclination angle in the front opening portion that contacts the back surface of the screen. Type projection television. 2. The cabinet is provided with a surface having a slope angle corresponding to a size of the screen in an inward direction from an outer surface of the screen in a front opening portion of the screen which is in contact with the Fresnel lens screen. The rear transmission type projection television according to claim 1. 3. The cabinet according to claim 1 or 2, wherein a front opening portion of the screen, which comes into contact with the Fresnel lens screen, is provided with a surface having a predetermined inclination angle on an upper side portion and a lower side portion. Rear transparent projection TV. 4. The cabinet according to claim 1, wherein the cabinet has a surface having a predetermined inclination angle on the left side portion and the right side portion of the front opening portion of the screen which is in contact with the Fresnel lens screen. Rear transparent projection TV. 5. The cabinet according to claim 1 or 2, wherein a front opening portion of the screen, which comes into contact with the Fresnel lens screen, is provided with a surface having predetermined inclination angles on the upper, lower, left and right sides. Rear transmissive projection TV. 6. The cabinet is characterized in that a front surface opening portion of the screen, which comes into contact with the Fresnel lens screen, has a different inclination angle between the surfaces provided on the upper and lower sides and the surfaces provided on the left and right sides. The rear transmissive projection television according to claim 1, 2, or 5. 7. The cabinet has a slope angle formed by the surfaces provided on the left and right sides with respect to a predetermined slope angle provided by the surfaces provided on the upper and lower sides of the front opening that contacts the Fresnel lens screen of the screen. The rear transmission type projection television according to any one of claims 1, 2, or 5, wherein 8. A video source housed in a cabinet,
A screen formed by laminating a Fresnel lens screen and a lenticular screen together, the screen being attached to the front opening of the cabinet through a fixing means, and a rear surface for projecting projection light from the image source on the rear surface of the screen as an enlarged transmission image. In the transmissive projection television, the screen is fixed to the front opening of the cabinet at a contact portion in contact with the Fresnel lens screen of the screen, and is hung from the cabinet at the contact portion. . 9. The screen is suspended from the front opening of the cabinet at the upper side portion, and at the lower side portion of the screen, the lower end portion is fixed without contacting the fixing means. 8. The rear transmission type projection television set forth in 8.