JPH0243879A - Backproject type television set - Google Patents

Abstract

PURPOSE:To attain the projection of a picture on plural screens by one projection means by providing a moving means to a reflecting means changing the projecting direction from the projection means. CONSTITUTION:A reflection plate 4 as a reflection means changes the projection direction from a projection section 1. Surface reflecting mirrors 4a, 4b are provided on both faces of the reflecting plate 4, which is rotated by a motor around a shaft 4c. Thus, one projection means 1 moves the reflecting plate 4 to project a picture on plural screens 5 and the space and cost are saved to project a picture on plural rooms. Moreover, the surface reflecting mirrors 4a, 4b are provided on both faces of the reflecting plate 4 to decrease the size of the reflecting plate 4 more than the case with the reflecting plate 4 using only one side.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a rear projection television apparatus that projects from the back of a screen.

<Prior Art> In recent years, many conference rooms, training rooms, etc. are equipped with wall-embedded rear projection television devices.

Compared to front projection types, rear projection types are less affected by external light and can provide good images even in bright rooms, so meetings, training sessions, etc. can be carried out efficiently without the need for lighting adjustments. can.

<Problems to be Solved by the Invention> However, it is impossible to move the above-mentioned conventional wall-embedded rear projection television device to another room, and in order to obtain a similar image in another room, a similar rear projection television device is required. It is necessary to install one more type television device, which requires relatively large costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rear projection television apparatus which eliminates the drawbacks of the prior art example and can project images to a plurality of rooms at low cost.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a plurality of screens that display images according to image signals, and a projection system that projects images according to the image signals from the back side of the screen. means and
A rear projection television apparatus having a reflecting means for changing the direction of projection from the projection means, comprising means for moving the reflecting means so that images can be displayed on the plurality of screens by changing the projection direction. This is what I did.

Further, it is preferable to provide reflecting mirrors on both sides of the reflecting means.

<Operation> The present invention configured as described above enables images to be projected onto multiple screens by moving the reflecting means using one projection means, thereby saving space and cost and allowing images to be displayed in multiple rooms. can be projected.

Further, by providing anti-tJJ mirrors on both sides of the reflecting means, the size of the reflecting means can be made smaller than in the case of one side.

<Example> An example of the present invention will be described below with reference to FIGS. 1 to 8.

In FIG. 1, reference numeral 1 denotes a projection section, which is composed of a liquid-cooled projection tube section 2 and a projection lens 3, as shown in FIG. 3, and is mounted on a floor 7 of a room and held on a stand 6. The liquid-cooled projection tube section 2 is red (R), green (G), and blue (B).
Three liquid-cooled projection tube sections 2 corresponding to each color are arranged in parallel, and are composed of a projection tube 2a and a cooling stage 2b,
The projection tube 2a adopts an electromagnetic focusing method, for example, and has a
A 13-inch projection tube is used, and the cooling means 2b is constructed by filling a space between the projection tube 2a and the projection lens 3 with a coolant 1 having high light transmittance and good heat transfer rate, such as an aqueous solution of ethylene glycol, The cooling means 2b can significantly reduce the reflected light generated at the interface between the projection tube 2a and the projection lens 3, improving the cooling effect and making it possible to increase the input power of the projection tube 2a. Further, the projection lens 3 is made of glass,
It is constructed using a plurality of plastic spherical or aspheric lenses. The image information input to the projection section 1 is supplied from an external information source such as a VTR, laser disc, TV camera, or personal computer.

Reference numeral 4 denotes a reflecting plate as a reflecting means, which changes the direction of projection from the projection section 1. As shown in FIGS. 4 and 5, the reflector 4 has surface reflectors 4a and 4b with a reflection rate of about 90% on both sides to suppress deterioration of brightness and resolution. , and is rotatable about a shaft 4C by a motor (not shown) or the like, and has a projecting edge 4d at its upper end. Furthermore, in order to fix the reflecting plate 4 at the set rotational position (the solid line position and the broken line position), a positioning part 8 having a touch sensor 9 on the room side and a shock absorber which can be rotated by the operation of a solenoid 12 are provided. Two sets of arms 10 having springs 11 are provided symmetrically about the axis 4C, and when the solenoid 12 is energized, the projecting edge 4d of the reflecting plate 4 is held between the arms 10 and the positioning portion 8.

In addition, as shown in Fig. 5, the lengths from the shaft 4C to the upper and lower ends of the reflector 4 are each 11 A2 (I12>11).
is set to . Therefore, the length of the reflector 4 is J+
+A2 I'm sorry to say this, but if a reflector is provided on only one side of the reflector plate 4, its quality will be 2X12, and I11+12<2
Since it is Xi2, there are reflecting mirrors 4a and 4b on both sides of the reflecting plate 4.
By providing this, it is possible to shorten the length of the reflector 4.

5 is the projection section, which is an acrylic screen on which the image is projected, as shown in Figure 6.

It is composed of two lenses, a lenticular lens 5a and a Fresnel lens 5b, which are made of transparent plastic material such as polystyrene, vinyl chloride, polycarbonate, etc. The lenticular lens 58 is provided with a diffusion layer 5C on its surface, and its cylindrical surface is arranged at a pitch of about 0. The diffusion layer 5 is made of a transparent material having a refractive index difference of about 0.01 to 0.05 with respect to the base plastic. 2 For example, fine particles such as silica, alumina, glass, etc. are mixed or coated on the base material to control the directivity in the vertical direction, and the Fresnel lens 5b has a concentric pitch of about 0.1 to 1. ．． OM, and is configured to condense the projection light toward the front.

Note that 13 is the ceiling of the room.

The operation of this embodiment having the above configuration will be explained using the flowchart shown in FIG.

First, in step (2), the touch sensor 9 of the positioning section 8 detects whether the direction of the reflection plate 4 is the same as the direction of the room in which the image is to be projected. For example, when projecting onto room A, it is located at the solid line position in FIG. 1 or FIG. 5, and when projecting onto room B, it is located at the broken line position in FIG. 2 or FIG.

Therefore, if the directions are the same, proceed to step (3) and start projection. If the orientation is different, in step ■,
The arm 10 fixing the reflector 4 is released by moving the solenoid 12 six times. Next, in step ■, the axis 4C
The reflector plate 4 is rotated by a motor (not shown) or the like around .
In step ■, it is detected whether or not the reflector 4 has reached the other touch sensor 9. When the touch sensor 9 reaches A, the rotation of the reflector 4 is stopped in step ■, and the arm 10 is moved in step ■. Fix the reflector 4. However, if the image is projected onto the screen 5 as it is, the projected image will be projected as an inverted image, as shown at 1' in FIG. Therefore, in order to project a normal image, in step 1, for example, the polarization sawtooth wave current polarity output from the horizontal and vertical deflection circuits is reflected and output. 8. Flip it vertically and horizontally as shown in Figure 8 (a). Next, in step (2), projection is performed, and when all projections are completed in step (2), the entire process is completed.

FIG. 9 shows another embodiment of the invention.

In order to simplify the explanation, the same parts as in the previous embodiment are given the same reference numerals, and only the different points will be explained.

In this embodiment, the projection unit 1 is mounted on a ceiling 13 using a pedestal 6 so as to be suspended from the ceiling. The other configurations are completely the same as those of the previous embodiment.

In this embodiment with the above configuration, the floor 7 can be used effectively, and its operation is similar to that of the previous embodiment.

FIG. 10 shows still another embodiment of the present invention.

In this embodiment, a liquid crystal projection 21 is used as a projection means in place of the liquid-cooled projection tube section 2 of the projection section 1 in the previous embodiments.

That is, the liquid crystal projection 21 is
The light output from the light source lamp 23 on the right side of the heat filter 24. The liquid crystal panel 26 is reached through an illumination lens 25, and a projection lens 27 is provided in front of the liquid crystal panel 26. The liquid crystal panel 26 is driven by TPT active matrix driving, and the surface of the liquid crystal panel 26 is red (R).
), green (G), and old (B) color filters are provided, and the light passing through the liquid crystal panel 26 is transmitted to the projection lens 27.
This makes it possible to project an image corresponding to each pixel of the liquid crystal panel onto a screen (not shown). The other configurations and operations are the same as those of the previous embodiments.

〔Effect of the invention〕

As explained above, by providing the moving means in the reflecting means that changes the direction of projection from the projecting means, the present invention makes it possible to project images onto a plurality of screens with one projecting means. You can save costs.

Further, by providing reflecting mirrors on both sides of the reflecting means, there is an effect that the size of the fouling means can be made smaller than in the case of a reflecting mirror on the moon surface.

4. Drawing 1! ! l! 1. Explanation FIG. 1 is a schematic configuration diagram of a rear projection type array vision device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the projection direction changed, and FIG. 4 is a perspective view of the reflector, FIG. 5 is a side view of the mechanism for fixing the rotating position of the reflector, FIG. 6 is a perspective view of the screen, and FIG. 7 is a flowchart explaining the operation. , FIG. 8 is a state diagram of a projected image, in which (a) shows an erect image and (b) shows an inverted image, and FIG. 9 is a schematic configuration diagram of a rear projection type preview device according to another embodiment of the present invention. , FIG. 10 is a sectional view of a main part of another embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1... Projection part (projection means), 2... Liquid-cooled projection tube part, 3... Projection lens, 4... Reflection plate (reflection means), 4a, 4b... Reflector, 4C.・Axis, 5
...Screen, 6...Mounted on stand, 7...Floor, 8
...Positioning unit, 9...Touch sensor, 10...
Arm, 12... Solenoid, 13... Ceiling, 21
...Liquid crystal projection section (projection means), 23...
-Light source lamp, 26...Liquid crystal panel, 27...Projection lens.

No. figure 1 Niblow / 7th grade 4: Sorimura Mizotan 5: Screen No. figure No. figure (a)

Claims (1)

[Scope of Claims] 1. A plurality of screens for displaying images according to image signals, a projection means for projecting images according to the image signals from the back side of the screens, and a reflection for changing the projection direction from the projection means. 1. A rear projection television apparatus comprising means for moving the reflecting means, and capable of displaying images on the plurality of screens by changing the projection direction. Device. 2. The rear projection television apparatus according to claim 1, wherein reflecting mirrors are provided on both sides of the reflecting means.