JPH07270916A - Reflective body with polarizing plate and reflective body - Google Patents

Abstract

PURPOSE:To provide an improved large polarizing screen whose joint part is not viewed at all at the time of enjoying. CONSTITUTION:The reflective body with a polarizing plate is obtained by joining reflection members with a polarizing plate X constituted by laminating the polarizing plate 3 and a reflective member 1, one reflective member with a polarizing plate X is arranged in parallel to the other reflective member with a polarizing plate X, and furthermore, on a connecting part opposite to the sides of both reflective members X, a different reflective member with a polarizing member X is laminated so as to cover the connecting part with the member, and an angle theta made by the side and front surfaces of the different reflective member with a polarizing plate X is set to be a right angle, or an acute angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector with a polarizing plate and a reflector having a polarizing function.

[0002]

2. Description of the Related Art In recent years, liquid crystal projectors have become more and more popular, and various polarization screens provided with a polarizing plate have been proposed by utilizing the fact that the projection light of the liquid crystal projector is polarized light.

This polarizing screen has a feature that a high contrast can be obtained even in a bright room and a sufficiently bright image can be viewed, and in recent years, consumers' preference for a large polarizing screen (generally, 80 inches or more is called a large screen) is preferred. Is currently spurring more and more,
The demand for large polarizing screens is extremely high.

Here, the polarizing screen 4 provided with a polarizing plate
As shown in FIG. 1, a reflective member X with a polarizing plate is laminated on an appropriate supporting member 5, and the reflective member X with a polarizing plate is composed of a reflective member 1, a polarizing plate 3, and a protective member in order from the bottom. 7 (for example, PVC, OPP, fluorine film, hard coat layer) is laminated.

By the way, the polarizing plate 3 is formed by stretching a raw material 3'of polyvinyl alcohol resin to a width of 1/2 as shown in FIG. There is a limit to the width of the polarizing plate 3 (the length direction is endless). For example, when manufacturing a screen of 100 inches or more (a 100 inch screen means a polarizing screen 4 having a diagonal length of 100 inches), a polarizing plate 3 having a width of 1500 mm or more is required.

Therefore, at present, a polarizing plate 3 having a width smaller than that of the polarizing screen 4 to be manufactured (actually, a reflecting member X with a polarizing plate in which the reflecting member 1 and the protective member 7 are laminated) is shown in FIGS. The large-sized polarizing screen 4 is manufactured by splicing by various methods.

More specifically, the first conventional example shown in FIG. 3 has a structure in which the polarizing member with a polarizing plate X is simply arranged on the supporting member 5, and the second conventional example shown in FIG. A structure in which the members X are arranged in parallel and the opposing gap between them is covered with a suitable tape 6 is concealed. In the third conventional example shown in FIG. This is a method of arranging the members X side by side in a state of overlapping (FIGS.
In order to make the gap between the reflection members X with both polarizing plates in 5, 6 and 7 as small as possible, the reflection members X with polarizing plate are arranged in parallel, but in order to make the gap easy to understand in the drawing. , Emphasized and illustrated. ).

[0008]

The inventors of the present invention have conducted various experiments on these first, second and third conventional examples, and have confirmed the following drawbacks.

In the first conventional example, if the supporting member 5 is, for example, black as shown in FIG. 4, the gap between the reflection members X with both polarizing plates looks like a black line, so that a black line appears on the screen, and If the supporting member 5 is made of aluminum, there is a drawback that the gap looks like light, and bright lines appear on the screen, so that a good image cannot be viewed.

In the second conventional example, if the tape 6 is black as shown in FIG. 6, the tape 6 looks like a black line, so that the black line appears on the screen and a good image cannot be viewed. When the humidity is high, the tape 6 may be peeled off by moisture, and when the tape 6 is thin, the tape 6 is dented along the facing gap between the reflection members X with both polarizing plates as shown in FIG. A concave groove is formed in the direction, and the existence of the concave groove darkens the vicinity of the concave groove (a shadow appears), resulting in a screen with unevenness.

The third conventional example has a drawback that, like the second conventional example, the portion a in FIG. 8 appears as a streak on the screen as shown in FIG. 9, and a clear image cannot be viewed.

The present invention has solved such drawbacks, and it is a technical problem to provide an excellent reflector with a polarizing plate and a reflector which allow a good image to be viewed.

[0013]

The gist of the present invention will be described with reference to the accompanying drawings.

A reflector with a polarizing plate, in which a reflecting member with a polarizing plate X formed by laminating a polarizing plate 3 and a reflecting member 1 is joined,
Another polarizing plate-equipped reflecting member X is arranged in parallel with one polarizing plate-equipped reflecting member X, and another polarizing plate-equipped reflecting member is concealed by the connecting portions where the side surfaces of both polarizing plate-equipped reflecting members X oppose each other. The present invention relates to a reflector with a polarizing plate, wherein Xs are laminated and the angle θ formed between the side surface and the surface of the separate reflecting member X with a polarizing plate is set to a right angle or an acute angle.

In a reflector in which the reflecting members 1 are joined, one reflecting member 1 is provided with another reflecting member 1 in parallel, and the connecting portions are concealed by the connecting portions where the side surfaces of both reflecting members 1 face each other. In this state, the separate reflection member 1 is further laminated, and the separate reflection member 1
The angle θ formed between the side surface and the surface is set to a right angle or an acute angle.

[0016]

The function of the present invention will be described.

The angle θ formed between the side surface and the surface of the reflective member X with polarizing plates, which is further laminated on the continuous portion of the reflective member X with both polarizing plates (the protective member 7 may or may not be present), is a right angle. Alternatively, since it is an acute angle, unnecessary absorption and reflection of the projected light does not occur. This point will be described in detail with reference to FIG. 10 (the gap between the reflection members X with both polarizing plates in FIG. 10 is emphasized for the same reason as above).

FIG. 10 shows the case where the angle θ formed between the lower side surface and the surface of the reflecting member X with a polarizing plate on the uppermost surface side (the leftmost side in FIG. 10) in FIG. 10 is an acute angle and the formed angle θ.
FIG. 4 is an explanatory diagram for comparison with the case where the angle is set to an obtuse angle.

When the angle θ is made obtuse, a black line exists on the side surface of the reflection member X with a polarizing plate (indicated by S in the figure) when it absorbs light in black or the like. In addition, when the side surface is reflected, it appears that a bright line exists on the side surface, and consequently, the image on the screen cannot be viewed well.

However, the above does not occur when the angle θ is a right angle or an acute angle. That is, according to the invention described in claim 1, it can be seen at a glance that the polarizing screen 4 is a jointed screen, but in actuality, when a picture is taken, a good image which is not known to be a jointed screen can be viewed. It will be different.

The above is the same when the surface of the polarizing screen 4 is a concave curved surface.

The operation of the invention according to claim 2 will be described.

The invention according to claim 2 is an application of the invention according to claim 1, which is a reflector capable of obtaining proper reflected light by making the angle θ acute.

[0024]

11 and 14 show the case where the present invention is applied to a polarizing screen 4, which will be described below (FIGS. 11, 13 and 14).
The gap between the reflective members X with both polarizing plates in FIG. ).

In FIG. 11, two polarizing plate-equipped reflecting members X (the protective member 7 may or may not be provided) are laminated on the supporting member 5, and one polarizing plate-equipped reflecting member X is further laminated. That is the case.

The polarizing screen 4 of FIG. 11 has a step on the surface, which causes the focus to be out of focus. Generally, however, a large screen has a long projection distance, and this problem does not actually occur. As a result of the experiment, it was confirmed that the polarizing screen 4 had no practical problem if the thickness was up to about 50 mm.

Further, X ₁ and X ₂ (shown in FIG. 11) are preferably made of the same material and have the same structure, and X ₂ and X ₃ (shown in FIG. 11) are preferably made to have the same thickness, and X ₂ and X ₃ are made of the same material. May be different. Theoretically, X ₃ does not need the polarization function and the reflection function. This is because the entire surface of X ₃ is hidden by X ₁ .

FIG. 11 shows a case where the size of X ₁ is set to cover the entire surface of X ₃ and a part of X ₂ . Further, only the angle θ formed between the side surface of X _{1 on} the left side in FIG. 11 and the surface is set to an acute angle, and the remaining angle θ formed is set to a right angle. The angle θ between the side surface on the left side in FIG. 11 and the surface of X ₁ is appropriately determined depending on the positional relationship between the light source 2 and the polarizing screen 4. The point is the light source 2
Therefore, the positional relationship between the angle θ and the light source 2 is set so that the projection light is not directly irradiated to the side surface of the angle θ formed by X ₁ .

The following are specific examples.

A polarizing screen 4 having a structure similar to that of FIG. 11 in the case of a 100-inch polarizing screen 4.

A reflection member X with a polarizing plate having a width of 800 mm and a length of 2000 mm is mounted on a support member 5 made of aluminum having a thickness of 1.5 mm.
(Reflector 1 is aluminum foil reinforced with plastic plate)
And glue them side by side. In this case, the polarizing members with polarizing plates X are different only in width, and the others are the same. The thickness of the polarizing member with polarizing plates X is 0.8 mm, and the thickness of the reflecting member 1 is 0.5 mm.
mm.

A PVC sheet is attached as a protective member 7 to the surface of the reflective member X with a polarizing plate.

Then, with one polarizing plate-equipped reflecting member X entirely concealed, and a part of the other polarizing member-equipped reflecting member X extending over the other polarizing member X (takes 150 mm), the same structure is formed and the width is 950 mm and long. A 2000 mm thick polarizing member X with a polarizing plate is laminated. The angle θ formed by the side surface and the surface of the reflective member X with the polarizing plate is about 13 degrees.

In the polarizing screen 4 thus created, a liquid crystal projector is adopted as the light source 2, and the projection distance 3
m, the positional relationship between the liquid crystal projector and the polarizing screen 4 was set as shown in FIGS. 12 and 13, and when an image was actually projected on the polarizing screen 4, it was a screen in which the joint portion was completely unknown.

FIG. 14 shows another embodiment of the present invention in which X ₄ , X ₅ , X ₆ , X ₇ , X ₈ and X ₉ are laminated, and the angle formed by the side surface of X _{9 on} the right side in FIG. 14 and the surface. Other than setting θ to an acute angle,
The remaining angle θ is set to a right angle. Incidentally, FIG.
The number inside shows the width of the reflective member X with a polarizing plate (unit is m
m).

As described above, according to the present invention, it is possible to prepare any large polarizing screen 4 by preparing the reflecting member X with the polarizing plate of several kinds of widths, and this large polarizing screen 4 can display a good image. Is possible.

However, the present inventor has confirmed the following points as a result of the experiment.

The thickness of the polarizing screen 4 is about 0.5 m
If the thickness is m or less, the thickness is too thin, and the polarizing member with polarizing plate X bends and falls into the facing gap of the lower reflecting member with polarizing plate X, which is not preferable as described in the section of the conventional example.

If the thickness is about 50 mm or more on the assumption that the projection distance is in the range of 3 m or more, the image on the polarizing screen 4 is blurred due to the problem of the focal length described above, which is not preferable in terms of practicality.

[0040]

Since the present invention is constructed as described above, it is possible to provide an excellent reflector with a polarizing plate and a reflector in which the joint portion is completely unknown at the time of viewing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a polarizing screen.

FIG. 2 is a diagram illustrating a manufacturing process of a polarizing plate.

FIG. 3 is an explanatory side view of a first conventional example.

FIG. 4 is an explanatory plan view of the above.

FIG. 5 is an explanatory side view of a second conventional example.

FIG. 6 is an explanatory plan view of the above.

FIG. 7 is a side view illustrating a defect of the second conventional example.

FIG. 8 is an explanatory side view of a third conventional example.

FIG. 9 is an explanatory plan view of the above.

FIG. 10 is a diagram illustrating the principle of the present invention.

FIG. 11 is an explanatory side view of the present embodiment.

FIG. 12 is an explanatory plan view of the present embodiment.

FIG. 13 is an explanatory side view of the present embodiment.

FIG. 14 is an explanatory side view of another example.

[Explanation of symbols]

 1 Reflective member 3 Polarizing plate X Reflective member with polarizing plate

Claims (2)

[Claims] 1. A reflector with a polarizing plate, which is a combination of a polarizing member and a reflecting member formed by laminating a polarizing plate and a reflecting member, wherein one polarizing member with another polarizing member is provided in parallel, A separate polarizing member with a polarizing plate is further laminated on the connecting portion where the side surfaces of the polarizing members with polarizing plates face each other so as to conceal the connecting portion, and the side surface and the surface of the separate reflecting member with polarizing plate are formed. A reflector with a polarizing plate, wherein the angle θ is set to a right angle or an acute angle. 2. A reflector having a joining of reflecting members, wherein one reflecting member is provided with another reflecting member in parallel, and the connecting portions are concealed by the facing connecting portions of the two reflecting members. And a separate reflection member is further laminated, and the angle θ between the side surface of the separate reflection member and the surface is set to a right angle or an acute angle.