JPS6388976A - Multiple face multi-rear projector - Google Patents

Abstract

PURPOSE:To realize a large picture by small depth by arranging rear projectors that bend the optical path of projected light emitted from a projecting tube twice and project on a transmitting type screen vertically and horizontally. CONSTITUTION:Light projected from a projecting tube 1 is reflected by a lens assembly 2 and reflected again by a reflection mirror 9 and goes to a transmitting type rear screen 3. Similarly, light from a projecting tube 11 goes to a rear screen 13 and forms a picture. Accordingly, at least 4 (rear screen) X3 (red, green, blue) = 12 projecting tubes and lens assemblies are provided in a cabinet 7, and by electrical driving to projecting tubes, a video of large screen of 80 inches can be projected, or, separate videos can be projected on four rear screens.

Description

[Detailed Description of the Invention] Before Industrial Use] This invention relates to a multi-rear projector that can obtain an even larger screen by arranging a plurality of large-screen glue projectors vertically and horizontally.

This conventional technology] 6n, l--/ = j+-, Gubero L
^LE<:; , -p i +, zthv=
Goat projector or projection TV
It is not only for the purpose of increasing the screen size of a color TV, but also because of its functional characteristics. In the future, it is expected to be developed into a wide variety of applications, including video theaters that replace movies. In particular, since the brightness of images projected by rear projectors has become extremely high, it is desired to arrange them vertically and horizontally to create a large screen.

Therefore, a device shown in FIG. 3 was conventionally considered as this type of device. In the figure, 1R1IC.

IB is red, green, and blue projection tubes arranged in three depths in Figure 3, 21't, 2G, 21 (also projection tube 1
rj, IG, +13 is a lens system that magnifies and condenses the projected light, 3 is a transmissive rear screen equipped with a Fresnel lens or a lenticular lens, and projection tubes lR9IC, I
The projection light emitted from B travels straight on a straight line, reaches the rear screen 3, and is diffused to project an image.

Similarly, in the case shown at the bottom, projection tubes 11R of each color are shown.

The projection light emitted from 11G and IIB is transmitted through lens system 12R.
, 12G, and 12B, the light is magnified and condensed, and diffused to the transmission type rear screen 13 to display an image. If four rear projectors of this combination are arranged vertically, horizontally, and vertically, for example, each 40-inch projector will have an 80-inch screen.
It becomes a large screen projector.

Note that 5.6 and 15.16 are shelves that support the projection tube and lens system, and electrical circuit parts that drive the projection tube are mounted. Further, 7 is a cabinet for this large screen projector, and 8 is a caster for making this large screen projector movable.

[Problems to be solved by the invention] Since the conventional large screen projector is configured as described above, the depth of the cabinet is the projection distance from the rear screen to the lens system, the length of the lens system, and the length of the projection tube. For example, in the case of a large screen projector using a 40-inch rear projector, the depth is approximately 1
The size was 900 mm, which was quite large, making it difficult to move and transport, and requiring a large installation area, making it difficult to put it into practical use.

[Means for Solving the Problems] This invention was made in order to eliminate the drawbacks of the conventional ones as described above. By arranging the rear projectors, which bend the optical path of the projected light twice and project it onto a transmissive screen, vertically and horizontally, a large screen can be created.Moreover, it is small in depth, easy to move and transport, and has a small footprint. The purpose is to provide a multi-rear projector.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1A shows a front view of a four-sided multi-rear projector. Reference numerals 3, 13, 23, and 33 each represent, for example, a 40-inch transmissive screen, and one television image can be enlarged to 80 inches on these four sides. 7 is a cabinet equipped with a screen frame, and 8 is a caster for movement, transportation, etc.

FIG. 1B is a sectional view seen from the negative side. First, the lens assemblies 2.12 for each color will be explained.

A lens assembly 2 is provided facing the projection tube l of each color. This lens assembly 2 is viewed from the projection tube l side.

For example, a concave lens 2B that may be filled with liquid to cool the projection tube l, and a convex lens 2C made of high-power glass.
, a convex lens 2D made of plus deck that has an aspherical surface and also corrects distortion of the optical system, a reflector 2A built into this lens assembly 2 that reflects light rays, and an aspherical surface that serves as a light projection aperture of this lens assembly 2. The lens 2E is made of plastic and has almost zero power.

It is reflected by the solid body 2, reflected once again by the reflecting mirror 9, and reaches the rear screen 3 of the transmission type. This projection tube l is red,
Three green and blue tubes are used, and the three tubes are lined up toward the back when viewed from the figure, and each light beam passes through almost the same path and is scanned while converging to one point to obtain an image on the rear screen 3. Similarly, the light beam projected from the projection tube II is transmitted to the lens assembly 1.
2 concave lens 12B, convex lens +20, convex lens 12D
1, a reflecting mirror 12A, and a lens 12E, the light is reflected by a reflecting mirror 19, and reaches the rear screen 13 to form an image. Further, the image projected onto the rear screen 23.degree. 33 is similarly projected by a projection tube, a lens assembly, and a reflecting mirror. Therefore, the cabinet 7 has at least 4 (rear screen) x 4 projection tubes and lens assemblies.
3 (red, green, blue) = 12 pieces are provided, and an 80-inch large screen image is displayed by electric drive to the projection tube.
Alternatively, separate images can be projected on each of the four rear screens.

An example is shown in which two reflecting mirrors are installed inside the body. Here 2, I
2 are two reflecting mirrors 2A and +2A, respectively.

This is a lens assembly equipped with 2F and 12F'. In this case as well, the same effects as in the above embodiment can be achieved. Also, since the angle of the reflector requires great precision in order to focus on the rear screen, it can be said that this method produces a better effect when considering the installation.

In the above embodiment, four multi-rear projectors were explained, but if n2 (n is an integer of 2 or more) rear projectors are combined to form a multi-sided multi-rear projector, the screen will be even larger, and each rear projector will have a High-quality, extremely bright images can be obtained.

[Effects of the Invention] As described above, according to the present invention, the following effects can be achieved.

(a) As shown in FIG. 1, since the optical path is bent twice, the depth of the cabinet can be significantly reduced.

(b) Since a lens assembly with a built-in reflector is used, even if the light beam is bent, it will not interfere with the light path of other projection tubes, making it possible to use multiple units on the left and right sides under L. Can be done.

(c) Since the projection tube, lens assembly, and drive circuit member can be integrated, when moving or transporting, the cabinet, projection tube, lens assembly, etc. can be packed and moved separately.

(d) Multi-surface multi-screen is better in brightness and has better convergence than the case where images are obtained by projecting onto one large screen using 3n projection tubes and lenses (n is an integer, 3 is 3 colors). It is easy to capture, provides high quality images, and is easy to achieve if you want to obtain separate images for each screen.

[Brief explanation of the drawing]

1A and 1B are a front view and a side sectional view showing a multi-face multi-rear projector according to an embodiment of the present invention, FIG. 2 is a side sectional view showing another embodiment of the invention, and FIG.
The figure is a side sectional view showing a conventional glue abrogiek. 1. II--projection tube, 2.12--lens assembly 3, +3.23.33--rear screen 7--cabinet

Claims (1)

[Claims] n^2 (
n is an integer greater than or equal to 2).