JPH05273651A - Projection and reflection type screen - Google Patents

Abstract

PURPOSE:To obtain a projection and reflection type screen in which optional screen reflection characteristics in accordance with observation environment can be obtained and which is bright, and also which has a wide range to be observed. CONSTITUTION:As to a reflection type screen in which an image is projected from a projector and which is used when the image is observed from the same direction as that of the projector; reflecting layers 12 are respectively provided on the nearly hemispheric part of plural kinds of transparent beads 11A and 11B whose refractive indexes are mutually different in state where they are on a back surface on a projecting side, and they are plurally mixed, and transferred or bonded on a screen base material 13.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an image projector (slide projector, video projector, etc.).
A projection screen that is bright and has a wide observable range that can be used to obtain arbitrary screen reflection characteristics depending on the observation environment, especially when the image is viewed from the same direction as the projector. The present invention relates to a reflective screen.

[0002]

2. Description of the Related Art In recent years, a liquid crystal type video projector has been developed, and it has become possible to easily project a television image on a large screen and enjoy it. However, since this type of image is low in light and difficult to see in bright places,
I usually observe it in a dark room. And, as for the screen, if it is a diffuse reflection type such as cloth that is generally used from the past, the whole becomes even darker and it is not possible to interfere, so a screen with improved reflectance and brighter is used. There is.

As a reflection type screen used for projection of this kind, conventionally, for example, as shown in the sectional view of FIG. Ink or silver ink is printed or coated, and a matte transparent varnish is coated thereon as a protective layer 3, or a hard resin plate is used as a base material 4 as shown in the sectional view of FIG. There is also one in which an aluminum wheel or aluminum is vapor-deposited as the reflection layer 5 and a diffusion layer 6 is laminated with a varnish containing a diffusing agent or a film processed into a matte as the diffusion layer 6.

However, since these reflection type screens have specular reflection characteristics, that is, no retroreflection characteristics, when a large screen is used, the screen becomes darker as the screen size increases. (Screen gain value (SG value) is low).
Further, if the reflectance is increased to compensate for this darkening, hot spots will occur.

Therefore, recently, a bead screen has been proposed as a screen that solves such a problem. For example, as shown in the sectional view of FIG. 5, this bead screen has a white PVC substrate 7 on which a reflective layer 8 is formed, and a plurality of transparent glass beads 9 are adhered thereon. It is a thing. This bead screen is a bright screen because it has retroreflective properties and collects reflected light on the projector, but on the other hand, there is a problem that the observable range is narrow.

[0006]

As described above, in the conventional reflection type screen, when it is attempted to cope with the increase in size, there is a problem that the screen becomes dark as a whole or the observable range is narrow.

The present invention has been made in order to solve the above-mentioned problems, and provides a projection reflection type screen which is bright and has a wide observable range and which can obtain arbitrary screen reflection characteristics according to the observation environment. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention provides a reflection type screen used for projecting an image from a projector and observing the image from the same direction as the projector. Are provided on the approximately hemispherical part of different types of transparent beads, each having a reflective layer on the back side of the projection side, and a plurality of these are mixed and transferred or bonded onto the screen base material. Made of

Here, in particular, as the plurality of kinds of transparent beads having different refractive indexes, two kinds of beads having a refractive index of 1.92 and beads having a refractive index of 1.50 are mixed.

The reflective layer is any one of an aluminum vapor deposition layer, a silver ink layer and a gray ink layer.

Further, the screen base material is any one of vinyl chloride, polyester and cloth.

[0012]

Therefore, in the projection reflection type screen of the present invention, by mixing a plurality of types of beads having different refractive indexes, it is possible to obtain an arbitrary screen reflection characteristic by changing the mixing ratio.

As a result, it is possible to obtain a projection reflection type screen which is bright and has a wide observable range according to the observing environment.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing a structural example of a projection reflection type screen according to the present invention.

That is, as shown in FIG. 1, the projection reflection type screen of this embodiment has a plurality of kinds (two kinds in this embodiment) of transparent glass beads 11 having different refractive indexes.
Aluminum vapor deposition layer 12 is provided as a reflection layer on each of the semi-spherical portions of A and 11B so as to be the back surface on the projection side, and these glass beads 11A and 11B are placed on vinyl chloride sheet 13 which is a screen substrate. Multiple (1: 1
In the above), they are mixed and transferred by the transfer layer 14.

Here, as the two types of glass beads having different refractive indexes, for example, glass beads 11A having a refractive index n = 1.50 and glass beads 11B having a refractive index n = 1.92 are mixed.

The approximately hemispherical portion of the glass beads 11A, 11B is in the range of about 170 to 180 degrees.

Next, a method of making such a projection reflection type screen of this embodiment will be described.

First, the refractive index is 1.50 and the particle size is 80-150.
Glass beads 11A of μm, refractive index 1.92, particle size 8
The glass beads 11B of 0 to 150 μm are placed on a polyester film having adhesiveness, and the glass beads 11A,
A plurality of 11B are arranged at random so that the gap between them is minimized.

Next, aluminum vapor deposition is applied to the approximately hemispherical portion of each glass bead 11A, 11B to form an aluminum vapor deposition layer 12.

Thereafter, a vinyl chloride sheet 13 which is a screen substrate is coated with a pressure-sensitive adhesive which becomes a transfer layer 14 and has a higher pressure-sensitive adhesiveness than that used for the polyester film. The glass beads 11A and 11B are transferred to the vinyl chloride sheet 13.

As a result, a projection reflection type screen is obtained in which the aluminum vapor deposition layer 12 is the back surface on the projection side.

Next, the operation of the projection reflection type screen of the present embodiment constructed as described above will be explained.

First, the glass beads having a refractive index n = 1.92 have a sharp retroreflection characteristic with respect to the incident light A from the projector as shown in FIG. 2, and have a high screen gain (SG) value. , The observable range is narrow. Further, as shown in FIG. 2, the glass beads having a refractive index n = 1.50 are reflected at a wider angle than the glass beads having a refractive index n = 1.92, and the screen gain (SG) value is low. , The observable range is wide.

That is, as a comparative example, the refractive index n = 1.
The glass gain of 92 has a screen gain value of 29 in a bead screen in which a vapor-deposited aluminum layer is provided on the approximately hemispherical portion so as to be the back surface on the projection side, and a plurality of these are transferred onto a vinyl chloride sheet. The half-value angle was about 3 degrees.

Similarly, an aluminum vapor deposition layer is provided on the approximately semi-spherical part of the glass beads having a refractive index n = 1.50 so as to be the back surface on the projection side, and a plurality of these are provided on the vinyl chloride sheet. The transferred bead screen had a screen gain value of 4 and a half value angle of about 20 degrees.

On the other hand, in the projection reflection type screen of the present embodiment, the glass beads 11A having the refractive index n = 1.50 and the glass beads 11B having the refractive index n = 1.92 are mixed, so that the projector It is possible to obtain an arbitrary screen reflection characteristic suitable for the performance and the observation environment, in other words, it is possible to change the screen reflection characteristic.

That is, the glass beads 11A having a refractive index n = 1.50 and the glass beads 11 having a refractive index n = 1.92.
B and B were mixed in a mixing ratio of 1: 1, and the projection reflection screen of this example had a screen gain value of about 15 and a half value angle of about 15 degrees, which was bright and had a wide observable range. A screen was obtained.

As described above, the projection reflection type screen of this embodiment has the glass beads 11A having the refractive index n = 1.50.
Then, the aluminum vapor deposition layer 12 is provided as a reflective layer on each of the two types of glass beads 11A and 11B of the transparent glass beads 11B having the refractive index n = 1.92 so as to be the back surface on the projection side. , And these glass beads 11
A and 11B are mixed on a vinyl chloride sheet 13 which is a screen substrate at a mixing ratio of 1: 1 and transferred by a transfer layer 14.

Therefore, glass beads 11A having a refractive index n = 1.50 and glass beads 11B having a refractive index n = 1.92.
Since and are mixed, it is possible to obtain an arbitrary screen reflection characteristic according to the performance of the projector and the observation environment, in other words, it is possible to change the screen reflection characteristic.

As a result, even when the reflection type screen is enlarged, it is possible to obtain a projection type reflection type screen which is bright and has a wide observable range according to the observation environment.

The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

(A) In the above embodiment, glass beads having a refractive index of 1.50 and glass beads having a refractive index of 1.92 are used.
The case of arranging at random is described, but the present invention is not limited to this.

That is, for example, by arranging glass beads having a refractive index of 1.50 in the central portion and arranging glass beads having a refractive index of 1.92 in the peripheral portion, the retroreflective characteristics of the peripheral portion of the screen can be determined according to the use. It is possible to make it higher than the central part.

(B) In the above embodiment, the case where the glass beads having a refractive index of 1.50 and the glass beads having a refractive index of 1.92 are mixed has been described. It goes without saying that glass beads different from each other may be mixed.

(C) In the above embodiment, the case where two kinds of glass beads are mixed as the glass beads having different refractive indexes has been described, but the present invention is not limited to this, and three or more kinds of glass beads may be mixed. It goes without saying that it is good.

(D) In the above embodiment, the case where two kinds of glass beads having different refractive indexes are mixed at a mixing ratio of 1: 1 has been described. However, the present invention is not limited to this, that is, the brightness of the room. The required screen gain value and half-value angle are determined according to the size, the number of people to observe, and the model of the projector, and the desired screen reflection characteristics according to the observation environment can be obtained by changing the mixture ratio of the two. It becomes possible.

(E) In the above embodiment, as the reflective layer,
The case where the aluminum vapor deposition layer that is the metal vapor deposition layer is provided has been described, but the present invention is not limited to this, and a silver ink layer,
Alternatively, a gray ink layer may be provided.

(F) In the above embodiment, the case where the aluminum vapor deposition layer is provided as the metal vapor deposition layer which is the reflection layer has been described, but the present invention is not limited to this, and the metal vapor deposition layer may be a chromium vapor deposition layer, a silver vapor deposition layer, or You may make it provide a nickel vapor deposition layer.

(G) In the above embodiments, the case where vinyl chloride is used as the screen base material has been described, but the present invention is not limited to this, and polyester or cloth may be used as the screen base material.

(H) In the above embodiment, the glass beads are
Although the case where the transfer is provided on the vinyl chloride sheet which is the screen substrate has been described, the present invention is not limited to this, and the glass beads may be provided by being adhered to the vinyl chloride sheet which is the screen substrate by an adhesive layer. Good.

(I) In the above embodiment, the case where the transparent glass beads are used as the beads has been described, but the present invention is not limited to this, and transparent resin beads may be used as the beads.

[0044]

As described above, according to the present invention, in a reflective screen used for projecting an image from a projector and observing the image from the same direction as the projector, a plurality of reflective screens having different refractive indexes are used. Since the reflective layer was provided on each of the semi-spherical parts of the transparent beads of each kind so as to be the back surface on the projection side, and a plurality of these were mixed and transferred or bonded on the screen substrate, observation It is possible to provide a bright projection screen with a wide observable range capable of obtaining a desired screen reflection characteristic according to the environment.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a projection reflection type screen according to the present invention.

FIG. 2 is a schematic diagram showing an example of retroreflective characteristics of glass beads having different refractive indexes in the example.

FIG. 3 is a sectional view showing an example of a conventional reflective screen.

FIG. 4 is a diagram showing an example of a conventional reflective screen.

FIG. 5 is a diagram showing an example of a conventional reflective screen.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Reflective layer, 3 ... Protective layer, 4 ... Base material, 5 ... Reflective layer, 6 ... Diffusion layer, 7 ... Base material, 8 ... Reflective layer, 9 ... Glass beads, 11A, 11B ... Glass Beads, 12 ... Aluminum vapor deposition layer, 13 ... Vinyl chloride sheet, 14 ... Transfer layer.

Claims (4)

[Claims] 1. A reflective screen used for projecting an image from a projector and observing the image from the same direction as the projector, wherein a plurality of types of transparent beads having different refractive indexes are formed into a substantially hemisphere. A projection reflection type screen, characterized in that a reflection layer is provided on each of the parts so as to be the back surface on the projection side, and a plurality of these are mixed and transferred or bonded onto a screen base material. 2. The plurality of types of beads having different refractive indexes are beads having a refractive index of 1.92 and beads having a refractive index of 1.92.
The projection reflection type screen according to claim 1, wherein two kinds of 50 beads are mixed. 3. The projection reflective screen according to claim 1, wherein the reflective layer is any one of an aluminum vapor deposition layer, a silver ink layer, and a gray ink layer. 4. The projection reflection type screen according to claim 1, wherein the screen base material is any one of vinyl chloride, polyester, and cloth.