JPH03198491A - Multi-color projector - Google Patents

Abstract

PURPOSE:To make a projection part simple and compact by projecting a multi- color picture on a display device through a hologram, which is equipped with the operations of a filter and a lens, onto a screen. CONSTITUTION:Between a display device 1 and a screen 3, reflection type holograms 4 and 5 are provided with the operations of the filter and the lens to diffract red, green and blue beams, and the display device 1 displays the pictures corresponding to red, green and blue at the same picture display part. The pictures displayed on the display device 1 corresponding to red, green and blue are respectively diffracted by the reflection type holograms 4 and 5 and projected onto the screen 3 while being enlarged. Thus, the three couples of filters and lens at a conventional multi-color projector are not required and the projection part can be made simple and compact.

Description

[Detailed Description of the Invention] [Summary] Regarding a device for projecting an image displayed on a display onto a screen, the purpose of the present invention is to provide a multicolor projection device with a simplified and compact projection unit, and to display an image. At least one hologram having the functions of a filter and a lens is provided between the display device and the screen, and the multicolor image on the display device is projected onto the screen via the hologram. do.

[Industrial application field]

The present invention relates to a device for projecting an image displayed on a display onto a screen, and more particularly to a multicolor projection device whose projection unit is simplified and miniaturized.

Conventionally, multiple display devices were lined up in front of the viewers as a means of showing the output data of an information processing device to a large number of viewers, but in recent years, devices have been used that enlarge and project the images displayed by the display devices onto a screen. ing.

However, the currently used multicolor projection apparatus has a complicated structure of the projection section, which results in an increase in size and weight, making it difficult to carry. Therefore, there is a desire to develop a multicolor projection device with a simplified and compact projection unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multicolor projection device whose projection unit is simplified and downsized.

[Prior Art and Problems to be Solved by the Invention] FIG. 6 is a schematic diagram showing an example of a conventional multicolor projection device. The conventional multicolor projection device is composed of a display device I and a projection section 2. The display device 1 has image display sections IR1IG and IB corresponding to red, green, and blue, respectively, and a projection section 2.
are lenses 21R and 21G corresponding to red, green, and blue, respectively.
, 21B, and a filter 22 provided for each lens.
R, 22G, 22B, and lenses 21R, 21G
, 21B is an image display section IR.

The images displayed on IG and IB are superimposed and enlarged and projected onto the screen 3.

However, since the conventional multicolor projection device has three sets of lenses and filters in the projection section, the device becomes large and heavy, making it difficult to carry.

Further, there is a problem that the structure of the projection section is complicated and expensive.

[Means for Solving the Problems] FIG. 1 is a side sectional view showing the principle of a multicolor projection device according to the present invention. The same objects are represented by the same symbols throughout the figures.

The above-mentioned problem has at least one hologram 4 having the functions of a filter and a lens between the display device 1 that displays an image and the screen 3, and the multicolor image on the display device 1 is passed through the hologram 4. This is achieved by the multicolor projection device of the present invention which projects onto the screen 3.

[For production]

In FIG. 1, there is at least one hologram that has the functions of a filter and a lens between the display device that displays an image and the screen, and the multicolor image on the display device is transmitted through the hologram to the screen. The multicolor projection device of the present invention that projects images upward eliminates the need for three sets of lenses and filters in conventional multicolor projection devices, and realizes a multicolor projection device with a simplified and compact projection unit. be able to.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings. Fig. 2 is a diagram showing a method for creating a hologram, Fig. 3 is a perspective view showing the first embodiment of the invention, Fig. 4 is a perspective view showing the second embodiment of the invention, and Fig. 5 is a perspective view showing the second embodiment of the invention. It is a perspective view which shows the 3rd Example of this invention.

In FIG. 2, one surface of the hologram emulsion 41 is irradiated with a non-parallel laser beam 42, and one surface of the hologram emulsion 41 is also irradiated with a non-parallel laser beam 43, thereby producing two laser beams. 42 and 43 interfere with each other to form a reflection hologram having a lens effect. In addition, the reflection hologram has wavelength selectivity that selectively diffracts light of a specific wavelength and transmits light of other wavelengths, and acts as a filter.

That is, wavelengths λ0 and λ corresponding to red, green, and blue, respectively.
When one of these lights is selected and irradiated onto a hologram emulsion during hologram creation, a hologram that diffracts only a single wavelength light is formed. Furthermore, wavelengths λ8 and λ correspond to red, green, and blue, respectively.

By sequentially irradiating the hologram emulsion with light of λ during hologram creation, a hologram that diffracts light of a plurality of wavelengths is formed.

In FIG. 3, the first embodiment of the present invention has reflective holograms 4 and 5 that diffract red, green, and blue light between a display device 1 and a screen 3.
Images corresponding to red, green, and blue are displayed on the same image display section. Images corresponding to red, green, and blue displayed on the display device 1 are diffracted by reflection holograms 4 and 5, respectively, and are enlarged and projected onto the screen 3.

Further, in FIG. 4, the second embodiment of the present invention has reflective holograms 4 and 5 that diffract red, green, and blue light between the display device 1 and the screen 3, and the display device 1 has a red, green, and blue light. , green, and blue image display section IR2IG
, has IB. The images displayed on the image display units IR, IG, and IB of the display device 1 are enlarged and projected onto the screen 3 via the reflection holograms 4 and 5.

Further, in FIG. 5, the third embodiment of the present invention includes reflective holograms 4R14G and 4B corresponding to red, green, and blue, respectively, between the display device 1 and the screen 3;
It has a reflection hologram 5 that diffracts both green and blue light, and the display device 1 includes image display sections IR1IG and IB corresponding to red, green, and blue, respectively. The images displayed on the image display sections IR1IG and IB of the display device 1 are the corresponding reflection holograms 4R and 4G, respectively.
, 4B, and is further enlarged and projected onto the screen 3 via the reflection hologram 5.

In this way, between the display device that displays images and the screen, there is at least one hologram that has the functions of a filter and a lens, and the multicolor image on the display device passes through the hologram and appears on the screen. To achieve a multicolor projection device of the present invention that projects images on the screen, eliminating the need for three sets of lenses and filters in a conventional multicolor projection device, and simplifying and downsizing the projection unit. I can do it.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a multicolor projection device whose projection unit is simplified and downsized.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing the principle of a multicolor projection device according to the present invention, FIG. 2 is a view showing a method for creating a hologram, and FIG. Figure 4 shows the second embodiment of the present invention.
FIG. 5 is a perspective view showing a third embodiment of the present invention, and FIG. 6 is a schematic diagram showing an example of a conventional multicolor projection apparatus. In the figure, 1 is a display device, 1R1IG and IB are image display units, 3 is a screen, 4.4R, 4G, and 4B15 are holograms, 41 is a hologram emulsion, and 42.43 is a laser beam. The first modified example of the present invention is shown in Fig.3.

Claims (1)

[Claims] 1) At least one hologram (4) having the functions of a filter and a lens is provided between the display device (1) for displaying an image and the screen (3), and the display A multicolor projection device characterized in that a multicolor image on the device (1) is projected onto the screen (3) via the hologram (4). 2) A polychromatic projection device according to claim 1, wherein the hologram (4) diffracts only light of a single wavelength. 3) A polychromatic projection device according to claim 1, wherein the hologram (4) diffracts light of a plurality of wavelengths.