JPS5910902A - Multimirror and transmission type projector using said mirror - Google Patents

Abstract

PURPOSE:To make the depth of a transmission type projector smaller by arranging plural belt-like mirror faces provided at some angle to a mirror base plate. CONSTITUTION:An image projector 1', multimirrors 2' and 3' and a screen 4' are disposed. The light emitted from the projector 1' is reflected by the mirrors 2' and 3' and is made incident to the screen 4' with the center of the reflected light directed in the direction toward the normal of the center of the screen. Said light is emitted from the screen 4' and the video thereof is viewed by the observer. The mirrors 2' and 3' are installed with an inclination to a front face 5' and a rear face 6' and it is also possible to install the same in parallel with the front face or the rear face by adjusting the sizes or positional relations of the projector 1', the mirrors 2' and 3' and the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION In particular, the present invention relates to a multi-mirror that can perform reflection without taking up much space, and a transmission type projection device that uses the multi-mirror and that is small in size and particularly has a small depth.

Conventional projection device? When projecting onto a transmissive projection screen using a transmissive projection screen, the incident light is directed so that it almost coincides with the normal direction of the transmissive projection screen. By doing so, the incident light can be effectively emitted to the observation position, and in particular, by increasing the distance between the projection device and the transmission type projection screen, the diffusion angle of the emitted light can be reduced.

FIG. 1 is a schematic diagram showing the structure of a conventional projection type television device, in which projection light emitted from an image projection device 1 is reflected by mirrors λ and 3 and observed through a transmission type projection screen 47. . i/As is clear from the diagram, the mirror and mirror 3 are at an angle with respect to the front S and back B of the projection television device. As the size of the screen, that is, the size of the screen, increases, the mirrors λ and 3 also inevitably increase, which increases the overall size of the projection type television device, especially the first one.
An unavoidable drawback is that the depth, expressed as the length in the horizontal direction in the figure, becomes large.

The present invention was developed as a result of research conducted by the inventor in order to solve the above-mentioned conventional drawbacks, and instead of using a normal plane mirror as a reflecting mirror, a multi-mirror with a serrated cross section was prototyped and used. However, even though the mirror surface is divided into many parts, the images obtained are clear and unobstructed, and it has been found that by using such a multi-mirror 7, the transmission type projector can be made thinner. This discovery led to the present invention.

That is, the present invention is directed to a multi-mirror device in which a plurality of strip-shaped mirror surfaces are arranged at an angle to a mirror substrate. Each element of the projection device and the transmissive projection screen is different from each other, and after the image light beam emitted from the image projection device is reflected by the mirror, the center of the reflected light beam is directed toward the center of the transmissive projection screen. The gist of the transmission type projector is that it is arranged so that the light is incident in the normal direction of the screen.

The present invention will be explained in detail below.

FIG. 2 shows a side view of an example of the multi-mirror of the present invention, and shows one surface of the multi-mirror 7 with respect to the multi-mirror substrate, or in FIG. 2 with respect to the other surface. This figure shows a plurality of strip-shaped mirror surfaces 9 arranged at an angle of 2. In FIG. 2, the rising portion IQ between the mirror surfaces 9 is in the relationship of (tei! angle with respect to kig).

FIG. 3 shows another example of the multi-mirror of the present invention, and the multi-mirror/l in FIG. 3 is different from the one in FIG. y is the same, but the rising portion /, 2 is not perpendicular to the multi-mirror substrate, but is deviated from the perpendicular angle, as shown by the line of double marks Iθ in FIG. However, if the slope of the rising part is too high and the incident light beam also hits the rising part 13 as shown in the att diagram, reflection occurs also at the rising part 13 as shown by /4( in Fig. 4). code l
Since the reflection is different from the regular reflection shown by s, the clarity of the image will be lost if such a multi-mirror/Ag is used for reflection.

The above-mentioned multi-mirror is made by flat pressing or roll pressing a plastic plate having a reflective metal vapor deposited film such as aluminum or silver on one surface using a predetermined mold or roll mold. Alternatively, the plastic plate may be formed in advance in the same manner as above, and then the metal vapor deposited film may be removed.In addition, by any of the above methods, is the plastic plate transparent? If used, the surface side
For example, both can be used as a mirror, either on the side with the mirror surface 9 in Figure λ, or on the back side, for example, on the side indicated by the reference numerals in Figure U.

In addition to metal evaporated films, thin metal films such as gold-plated films can also be used for reflection.

In the IC explained above, the mirror surface 9 of each of the multi-mirrors shown in Figures 1 to 9 has a uniform dimension and angle 7 within the same multi-mirror, and if such a multi-mirror is used, almost Uniform reflection should be obtained.

However, the above multimirror may be further modified as follows.

Figure S shows the multi-mirror/Ag of the multi-mirror shown in Figure 2, which has each mirror surface and the angle of the back surface gradually changing from the top to the bottom in the drawing.
use Although not shown, the modifications made to the multi-mirror shown in FIG. 2 are also effective to the multi-mirror shown in FIG. 3, unless otherwise specified in the following description.

If there is a multi-mirror substrate as shown in Fig. S, for example, the incident light will spread out diagonally from the lower right, 1'''/l, f'!/
l, f'1 can be reflected. This kind of light condensing effect can be obtained by bending the multi-mirror shown in Fig. 6, as shown in Fig. 6. FIG. 7 is a plan view showing the state in which it is curved. When it is curved in this way, the light that previously entered from the right direction in the direction of FIG. 7 is reflected and at the same time is focused in the horizontal direction. may be used alone or in combination as appropriate - 1.Next, a transmission type projection device using a multi-mirror constructed as described above will be explained. The screens I and 3/ and the screen q' are arranged as shown in the figure, and the image projection device l
The light emitted from 'T' is reflected by the multi-mirrors 2/ and 31, and the y reflected light σ) is incident in the direction normal to the center of the sleeve q' and exits through the screen 4"Y to the viewer. The image is to be viewed g.In Fig. g, the multi-mirrors 2' and 3/ are installed at an angle with respect to the front side S' and the rear side 6, but the image projection device t//,
Multi mirror! and 3', and screen σ) It is also possible to make it parallel to the front or back surface by adjusting the size or positional relationship. If the dimension Y of the screen da' is not made thicker, it is possible to use a multi-mirror without using a multi-mirror.Also, at the position of the multi-mirror in Fig. g, the spread of the light ray is still small. is smaller and smaller than the multi-mirror y, so simply changing the face of the mirror 2 in Fig. 1 to the multi-mirror co' in Fig. Since the multimirror in Fig. 5 does not contribute to It becomes meaningful.

As explained above, since the multi-mirror of the present invention is provided at an angle to the mirror substrate and has a plurality of strip-shaped mirror surfaces arranged, it can also be used tilted compared to a normal mirror. , when used in the same position, the same reflection as when used with a normal mirror Y tilted is achieved.

Moreover, since the transmission type projection apparatus of the present invention uses the multi-mirror described above, it is not necessary to use tilted mirrors as shown by the symbols λ and 3 in FIG. Make the angle If that much with respect to the back direction 6' tc
<However, even if it is installed close to the front or back, it has the same effect as the mirrors and 3 in Fig. 1! As a result, the depth Y of the transmission type projection apparatus can be reduced even if the spread of the projection light beam on the screen is the same.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional transmission type projection device, Figs. 2 to 7 show embodiments of the multi-mirror of the present invention, Figs. 1 to 6 are side views, and Fig. 7 is a plan view. FIG. g is a schematic diagram of the transmission type projection apparatus of the present invention. / /'・・・・・・・・・・・・・・・ Image projection device 12λl・@@@@m@6668・, Mi(;-
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Claims (2)

[Claims] (1) A multi-mirror consisting of a plurality of strip-shaped mirror surfaces arranged at an angle to the mirror substrate. (2) Consisting of each element of a multi-mirror consisting of a plurality of band-shaped mirror surfaces arranged at an angle to the mirror substrate, an image projection device, and a transmission type projection screen, the image output from the image projection device A transmissive projection apparatus, characterized in that, after the light beam is reflected by the mirror, the center of the reflected light beam is incident toward the center of the transmissive projection screen in the normal direction of the screen. .