JPH01120983A - Projection type television receiver - Google Patents

Abstract

PURPOSE:To contrive to improve the performance by connecting and arranging 4 sets of projection type television receivers of 50 inches or the like closely mutually to constitute a screen in constituting the screen of 100 inches in size and using a linear or eccentric Fresnel screen for each of the 4 sets of the projection type television receivers thereby improving color shift and color mis-alignment on the screen. CONSTITUTION:A luminous flux radiated from an optical block 3/1 belonging to the 1st quadrant is reflected in a mirror 4-2 belonging to the 2nd quadrant and projected onto a transparent screen 5-2 of the 2nd quadrant to form a small pattern. A luminous flux radiated from an optical block 3-2 belonging to the 2nd quadrant is reflected in a mirror 4-1, projected onto the transparent screen 5-1 of the 1st quadrant to form a small screen. Similarly, the luminous flux is projected respectively on transmission screens 5-3, 5-4 of the 3rd and 4th quadrants to form small screens. Then the small screens are jointed by electric processing to form a large screen as a whole. As the transparent screen 5-1, a Fresnel screen 11, a linear Fresnel screen 12 and a reinticular screen 13 are arranged to constitute the entire screen.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projection type television receiving device that enlarges and projects a screen using a lens, and particularly relates to a projection type television receiving device that enlarges and projects a screen using a lens, and in particular, it is capable of producing a large screen (TV screen) of approximately 100 inches at a relatively low cost. The present invention relates to an ultra-thin and compact projection television receiver that can achieve high performance.

[Conventional technology]

Conventionally, for large screen TV receivers of approximately 100 inches, the Technical Report of the Television Society of Japan Vol. 1.6 No. 29 (1)
982) IPD72-1 pages 37 to 42 and I
As discussed on pages 42 to 47 of PD72-2, three projection tubes (cathode ray tubes) for blue, green, and red are 1 m long, and the images on each projection tube are placed in front of each other. The image was enlarged using a lens and projected onto the same screen to create a large screen.

[Problem that the invention seeks to solve]

In the above conventional technology, since the screen is 100 inches in size, it is technically difficult to use a Fresnel-shaped screen (Fresnel screen) used in home-use (approximately 5-inch) projection television receivers. It was difficult. That is, the Fresnel-shaped screen is ephemeral and is created by press molding with a mold, so the
It is necessary to process a 0-inch-sized mold and use it for molding, which is extremely difficult. Therefore, two lenticular screens, which can be extruded and can easily be made into large sizes, were combined to diffuse light horizontally and vertically. Such screens have poor light collection efficiency and are difficult to secure gain compared to the Fresnel screens mentioned above.
Therefore, the peak brightness is about 40 ft-L, which is 30 ft-L for home use.
There was a problem that it was much darker than 0fl-L.

In addition, in terms of magnification and concentration angle, the projection distance from the lens to the screen is long at 3000 to 4000 mm, so the overall set (image receiving device) has a long depth, is heavy, and has a high price. There was also a problem.

On the other hand, when projecting using only one set of three tubes, the screen size was 100 inches, so there were performance problems such as noticeable color shifts and color unevenness.

The purpose of the present invention is to solve the problems of the prior art described above,
In addition to achieving high performance that is bright and clear, with significantly improved color shifts and color unevenness, the entire set is much smaller in size and compact than a home projection TV receiver, and at the same time is inexpensive. The purpose of the present invention is to provide a type television receiver.

[Means for solving problems]

The above purpose is to configure a screen of about 100 inches.
Four approximately 50-inch projection television receivers are closely connected and arranged to form a 100-inch screen, and each of the four projection television receivers is equipped with a linear Fresnel screen or an eccentric Fresnel screen. This is achieved by using

In addition, one screen consists of four small screens, and each screen has four
A set of projection optical systems (such as a television receiver and a lens placed in front of it) are provided, and the positions of the four small screens are determined in order from quadrant 1 to quadrant 4 in a counterclockwise direction. In this case, the projection optical system located corresponding to the small screen in the first quadrant is used to project the screen onto the small screen in the fourth quadrant, and the projection optical system located corresponding to the small screen in the fourth quadrant is used to project the screen onto the small screen in the fourth quadrant. For example, by projecting the screen onto the small screen in the first quadrant, instead of projecting onto the small screen in the own quadrant, you can project the screen toward the small screen in the other quadrant, thereby reducing the interaction between the screen and the projection optical system. Even if the interval is constant, the projection distance for projecting the screen from the projection optical system onto the small screen can be longer than when projecting onto the small screen in the self-quadrant. A longer projection distance leads to a smaller concentration angle and viewing angle on the screen, which improves the color shift and color unevenness seen on the screen, improving performance.

The projection distance can be increased as much as possible by increasing the distance between the screen and the projection optical system, but in that case the set (receiver) becomes thicker and compactness cannot be maintained. It is desired to increase the projection distance while keeping the interval constant, and the above-mentioned device can be said to meet this demand.

[Effect]

The relationship between the projection distance and color shift (color unevenness) described above will be specifically explained with reference to FIGS. 5 and 6.

Figure 5 shows projection tubes (cathode ray tubes) IB, IC, and I that project images of blue (B), green (G), and red (R), respectively.
FIG. 3 is a plan view showing the planar arrangement of R and lenses 2 disposed on the front surfaces thereof. Color projection television receivers normally use these three projection tubes IB, IG, and IR, but there are blue and red projection tubes IB and IB on both sides of the green projection tube IG. It is common to place an IR.

Figure 6(a) shows the relative brightness IR of red on the screen.
FIG. 6(b) is a characteristic diagram showing the relationship between the color shifts Δ■, ΔI' and the concentration angle θ.

As can be seen in Figure 5, if the angle formed by the optical axes of the blue projection tube IB and red projection tube IR with respect to the optical axis of the green projection tube IG is the concentration angle θ, then the following equation is obtained. To establish.

θ'= 2 tan-' (d/L 1)
−・” (1) or θ′12jan−′(WP
/L2) - Old - (2) where d is the outer diameter dimension of the lens 2, Wp is the width dimension of the projection tube, Ll is the projection distance, and L2 is the optical path length.

Here, the smaller the width Wp of the projection tube or the outer diameter d of the lens, and the larger the distance Ll from the lens 2 to the screen 5 (projection distance) or the distance L2 from the phosphor screen to the screen 5 (optical path length). , the concentration angle θ can be made small.

The larger the concentration angle θ, the more the blue and red colors when viewing the image from the front of the transparent screen 5 are spread outward from each other and emitted. As a result, when the eye moves to the left or right of the screen, , when viewed from the E direction in FIG. 5, the blue (B) tinge appears stronger (on the contrary, when viewed from the F direction, the red (R) tinge appears stronger, disrupting the white balance and increasing so-called color shift. That is, as shown in FIGS. 6(a) and 6(b), when the blue brightness distribution TB and the red brightness distribution IR are obtained, the brightness differences ΔI and ΔI of each color when viewed from directions E and F are The smaller ′ is, the smaller the color shift is.For this purpose, the smaller the concentration angle θ is, the better.

In the current 100-inch projection television receiver, the concentration angle θ
is about 3 to 4 degrees, whereas it is about 7 to 8 degrees for a 50-inch home projection television receiver. By using a single-layer screen, the color shift is made comparable to that of the 100-inch projection-view receiver described above.

On the other hand, in order to make projection television receivers more compact,
In order to particularly reduce the depth dimension, a mirror is usually placed in the middle of the optical path to bend the optical path. However, even if a mirror is used, it is mainstream to use just a mirror from the viewpoint of reflection loss, optical adjustment, etc.

Figure 7 shows the depth dimensions of the set and the center height of the screen I.
FIG. 8 is a characteristic diagram showing the relationship between the depth dimension and the screen center height H when the projection distance is taken as a parameter. 4 is a mirror, and 5 is a transparent screen.

In this case, if the screen center height H is kept constant, the smaller the projection distance L1 is, the smaller the depth dimension can be, and if the projection distance L1 is constant, the higher the screen center height H is, the smaller the depth dimension can be. , the depth dimension can be reduced.

Further, FIG. 9 is a schematic diagram for explaining the angle of view, and as shown in this figure, the angle of view (2
As γ) becomes larger, the angle β of the light incident on the periphery of the screen 5 becomes smaller, and the reflection loss on the incident surface side of the screen 5 (the side where the lens is present) increases. Moreover, if you focus on the same peripheral area, it is blue.

Since the angles at which the green and red lights are incident are different, when looking at the periphery from the point P on the central axis of the screen 5, the white balance will shift and color unevenness will occur.Once the size of the screen 5 is determined, , the smaller the projection distance L, the smaller the angle of view (
2T) becomes larger, and color unevenness increases more.

As mentioned above, depending on the projection distance L1, the concentration angle θ and the angle of view (2
T) is determined, and as a result, color shift and color unevenness are determined. According to the present invention, as in the embodiment shown in FIGS. 1 to 3, which will be described later, the set can be made significantly more compact (smaller depth dimensions), and the projection distance L1 can be increased, so the concentration angle can be increased. The angle of view can be made smaller, and as a result, color shift and color unevenness can be significantly improved. In addition, since the blue, green, and red projection tubes IB, IC, and IR are arranged in line, horizontal color shift for each small screen can be completely eliminated, and as a result, there is no color shift as a whole. Therefore, it is possible to realize a large-screen projection television receiver.

On the other hand, a projection optical type (projection block) consists of a projection tube, a lens, a mirror, and a screen, each consisting of the three trees R, G, and B, and can provide an independent screen (small screen) by itself. By combining four units, a television receiver can obtain a large screen of approximately 100 inches. However, in the case of a small screen obtained by each projection block, the center of the optical axis of that screen, especially the Fresnel screen, is approximately the center of the small screen. The peripheral illumination ratio of the lens is usually 30.
%, etc., one screen made up of four small screens.
On a large screen of about 00 inches, the center of the large screen (
The point where the four small screens meet, that is, the corner of each small screen, becomes the darkest, which is inconvenient. Therefore, in the present invention, by adding a new linear Fresnel screen to the screen or using an eccentric Fresnel screen whose Fresnel center is eccentric, a large screen of 100 inches can be realized when viewed from the viewing position. The center can be made to have practical brightness. Further, the above-mentioned projection block may be used as is in a home projection television receiver of about 50 inches, and therefore, a thin design and low cost can be easily realized.

Furthermore, since the screen can be made four times as large while maintaining the resolution N obtained in each projection block, the resolution can be substantially doubled (2N), and high resolution can be achieved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIGS. 1 to 3 are explanatory diagrams of an ultra-thin large-screen projection television receiver as an embodiment of the present invention, viewed from the front. One screen that makes up the large screen when viewed from the front is divided into four small screens, and the small screen diagonally on the upper right is the first quadrant.
When each small screen is designated as the second quadrant ■, third quadrant ■, and fourth quadrant ■ in counterclockwise order, blue and green are placed in any quadrant.

A pair of red projection tube images is magnified by a lens placed in front of it, and projected by a mirror and a transparent screen placed in another quadrant to form a small screen in the other quadrant. This aims to increase the projection distance while keeping the distance between the screen and the screen constant.

The four small screens formed in this manner come together to form one large screen as a whole. For example, if the screen size of the small screens in each quadrant is 50 inches diagonally, a large screen of 100 inches can be realized as a whole of four small screens.

The details will be explained below. FIG. 1 is a front view showing the first embodiment of the present invention, as described above. In the same figure, IB, 1G,
IR is blue, green, red projection tube, 2 is lens, 3
-1 to 3-4 are optical blocks, 4-1 to 4-4 are mirrors, 5
-1 to 5-4 are transmission screens. In the following embodiments, the same parts are given the same numbers and their explanations will be omitted.

Blue green.

3-1 if the red projection tubes IB, IG, and IR are arranged vertically in-line with each other, and the lens 2 is arranged in front of each projection tube to form one independent optical block 3-1.
shall be.

An optical block 3-2.3-3.
3-4 will be provided. Optical block 3- belonging to the first quadrant ■
The light flux emitted from 1 is bent by the mirror 4-2 belonging to the second quadrant ■, and projected onto the transparent screen 5-2 of the second quadrant ■ to form a small screen, and the optical block belonging to the second quadrant ■ 3
-2 is bent by the mirror 4-1 in the first quadrant (2) and projected onto the transmission screen 5-1 in the first quadrant (2) to form a small screen. Furthermore, in the same way, the light beam emitted from the optical block 3-4 belonging to the fourth quadrant
3 and place it on the transparent screen 5-3 in the third quadrant ■.
In addition, the light flux emitted from the optical block 3-3 belonging to the third quadrant (■) is bent by the mirror 4-4 of the fourth quadrant (■) and projected onto the transmission screen 5-4 of the fourth quadrant (■) to form a small screen. Form. Then, each small screen is connected by electrical processing to obtain one large screen as a whole.

FIG. 4 is a sectional view taken along the line AA' in FIG. 1, and schematically shows the relative positional relationship among the projection tube, lens, mirror, and transmission screen. Transparent screen 5 as shown in FIG.
The optical block that should belong to screen 5-1 is
The projection distance (PQR and P'Q'R') can be made longer.

The dotted line in Figure 4 shows the position of the lens and projection tube in a conventional home projection television receiver, and in the 50-inch class, both the projection distance and screen width (WS) are 1000 m.
It is about m. Therefore, according to this embodiment, even when projecting onto the same 50-inch screen, the depth dimension D' does not increase even if the projection distance is increased by a considerable amount W, that is, approximately 2000 mm, and the depth dimension D' is not increased, but is 600 mm to 800 mm.
I can do it.

That is, in spite of the ultra-large screen of 100 inches, it is possible to realize an ultra-thin design with a depth of 600 to 800 mm, which is comparable to a 50-inch home projection TV receiver.

Figures 2 and 3 are respectively 2. FIG. 4 is a front view of the third embodiment, and main parts of cross sections BB', (, -C') are shown in FIG. 4.The second embodiment shown in FIG. The projection tubes IB, IG, and IR are arranged horizontally inline with each other, and the optical blocks 3-1.:3 are arranged in the same manner as explained in FIG.
-2.3-3.3-4 is formed. And the first quadrant■
The light flux emitted from the optical block 3-1 belonging to The light flux emitted from the optical bronch 3-2 belonging to
- Project on H. Similarly, the light flux emitted from the optical block 3-3 belonging to the third quadrant (■) is bent by the mirror 4-2 of the second quadrant (■), and is transmitted onto the transparent screen 5-2 of the second quadrant (■), and the light beam emitted from the optical block 3-3 belonging to the fourth quadrant (■) is The light flux emitted from the optical block 3-4 belonging to the first quadrant (2) is bent by the mirror 4-1 in the first quadrant (2) and projected onto the transmission screen 5-1 in the first quadrant (2) to form one small screen. The respective small screens are then connected together through electrical processing to obtain one large screen as a whole.

On the other hand, the third embodiment shown in FIG.
This is a configuration in which the positions of the optical block, mirror, and transmission screen in the embodiment are rotated approximately 45 degrees counterclockwise, and the same parts are given the same numbers.

In the second embodiment shown in Fig. 2, the width of the entire set is reduced (
In addition, the third embodiment shown in FIG. 3 allows the projection distance to be further increased, and therefore the concentration angle 2 screen to be further reduced, resulting in color shift.

The color unevenness improvement properties are further improved. Furthermore, the third embodiment has the feature that the functions and effects of the linear Fresnel screen shown in FIGS. 13 to 16, which will be described later, are most effectively utilized.

It goes without saying that the eccentric Fresnel screen and the linear Fresnel screen shown in FIGS. 19 and 15, which will be described later, are suitable for the first to third embodiments as well.

FIG. 10 is a perspective view showing the appearance of an embodiment of the present invention.

The ultra-thin projection type television receiver as an embodiment of the present invention shown in the figure is constructed by arranging four projection prons 6 shown in FIG. 11 in combination.

This layout configuration corresponds to the fourth quadrant ■ and the second quadrant ■ in Figure 10.
The projection block 6 shown in FIG. 11 is placed as it is, and the first
Projection block 6 in Fig. 11 is placed in quadrant ■ and third quadrant ■.
Place it upside down.

FIG. 12 is a cross-sectional view taken along the line A-A of the overall configuration in FIG. 10, and shows how the projection blocks 6 in FIG. 11 are arranged in the third quadrant ■ and the fourth quadrant ■ in FIG. It is something that

By arranging four projection blocks as described above, 1
In FIG. 10, which shows a large-sized projection television receiver on a stand, an operation panel 7 such as a tuner and a speaker 28 are arranged to constitute the entire ultra-thin projection television receiver. The operation of the overall configuration shown in FIG. 10 will be described below with reference to other figures.

The projection block 6 shown in FIG. 11 has lenses 2 arranged in front of three red, blue, and green projection tubes IR, IB, and IG, respectively, to form an optical block 3, which is housed in a housing 8 as a whole. Then, by enlarging the television images of the projection tubes IR, IB, and IG with the lens 2, and reflecting the enlarged image (not shown) with the mirror 4, the enlarged image is formed on the transmission screen 5-1. let

The viewer will see an enlarged image formed on the transparent screen 5-1 by the projection block 6 of FIG. It is necessary to have the following relationship between them.

FIG. 12 is a sectional view taken along the line AA in FIG. 10, and FIG. 13 is a partially enlarged view showing the configuration of the transmission screen 5-1 in FIG. 12. In FIG. 13, the transparent screen 5-1
are sequentially from the side of the mirror 4 in FIG. 12 toward the viewer 9,
Fresnel screen 11, linear Fresnel screen 1
2. and a lenticular screen 13 are arranged to constitute the whole. The Fresnel screen 11 is made of a transparent plate, and has a lenticular surface 14 on one side and a concentric Fresnel lens surface 15 on the other side.
The enlarged image from the optical block 3 shown in FIG. 2 is made wider in the vertical direction of the transmission screens 5-1 to 5-4 as viewed from the viewer side by the lenticular surface 14 shown in FIG. Further, the Fresnel lens surface 15 serves to condense the enlarged image from the optical block 3 toward the viewer by passing it through the Fresnel lens surface 15.

In addition, the lenticular screen 13 is equipped with cylindrical lens groups 16 and 17 on both sides, and the enlarged image from the optical block 3 is displayed on the screen 5 when viewed from the viewer's side.
Widen the field of view in the left and right direction from -1 to 5-4. in this way,
The enlarged image from the optical block 3 in FIG. 12 is focused in the direction of the viewer 9' by the Fresnel screen 11 and the lenticular screen 13 in FIG. The viewer 9' viewing the screen at the center of screen 5-4 can view a bright and sharp image at the center of the screen.

However, the viewer 9 located at the center of the screen of the ultra-thin projection television receiver shown in FIG.
The central part of the large screen 18, which is a composite of the four sides of -4, becomes dark, and the image is no longer sharp. To solve this problem, the linear Fresnel screen 1 shown in Fig.
2 was inserted between the Fresnel screen 11 and the lenticular screen 13 to form the projection block 6.

The operation of the linear Fresnel screen will be explained using FIGS. 14 to 17.

Figure 14 shows a 100-inch large screen 18 with four 50-inch transparent screens arranged.
This is a state diagram in which viewers 9 and 9' are viewing the large screen image, and the distance between the large screen 18 and the viewers 9 and 9' is set to 10,000 mm. The position of the viewer 9' is the optimum position when the linear Fresnel screen 12 shown in FIG.
The optimal position for viewing 8 is the position of viewer 9.

As shown in FIG. 15, four linear Fresnel screens 12 are arranged facing each other to form a large-screen linear Fresnel screen 19. FIG. 16 is a diagram showing a diagonal cross section BB of the linear Fresnel screen 12 in FIG. 15.

In FIG. 16, if the coordinates of the central part of the large linear Fresnel screen 19 in FIG. , n sin δ=sin (δ+tan-' (x/
10000) )......(3) It is necessary to set it as follows. Here, the refractive index of the linear Fresnel screen is n. FIG. 17 shows the relationship between the diagonal position X of the linear Fresnel screen and the angle δ of the linear Fresnel surface in the case of n=1.5, which is a graph of (3) 2 above.

FIG. 18 shows another embodiment of the present invention, in which four projection blocks 6 of FIG. 11 are tilted horizontally by 90 degrees. Lenticular screen 13 shown in FIG. Since the linear Fresnel screen 12 and the lenticular screen 11 are also turned over by 90 degrees in this embodiment, the image itself seen by the viewer is exactly the same as in the previous embodiment.

As described in detail above, by using the linear Fresnel screen according to the present invention in combination with the Fresnel screen and the lenticular screen, the viewer viewing the large screen of the ultra-thin projection television receiver can This allows you to see a bright and sharp image of the area.

Next, FIG. 19 is a sectional view of the Fresnel screen related to eccentricity. In the embodiments shown in FIGS. 1 to 3, FIG. 10, and FIG. 18, the main portions of the screen are shown in cross section in the diagonal direction, and only the Fresnel screen 14' is shown. As mentioned above, in order to make the image brightest and clearest as seen from the viewer 9, the following means are provided.

That is, the axes of the lens 2 and projection tube IG system are spaced Wc from the screen center axis IP of the entire set, and the liquid system is placed a distance LO from the screen. In this case, the center a of the Fresnel screen 14' is eccentric by Δh determined by the following equation (4).

ΔhζLO・Wc/ (L −1−L 0)
(4) For example, Fresnel screen 14
When the diagonal length of ' is 50 inches (approximately 1270 mm), Wc
' = 635mm.

In the case of a system in which L-10000 mm and LO=1500 mm, the entire set is eccentrically eccentric in the direction of the screen center axis II' along the diagonal line by an amount that is Δhζ801 from the above equation (4).

In equation (4) above, if Δh exceeds the value given on the right side, the brightness at the center of the large screen will become brighter, but on the other hand, the periphery will become dark (and a uniformly bright image will not be obtained. On the other hand, if Δh As the value falls below the value given on the right side, the periphery of the screen becomes brighter, but the center of the screen becomes darker, making it impossible to obtain a uniformly bright image.

FIG. 20 is a partially cutaway sectional view from the front when the eccentric Fresnel screen shown in FIG. 19 is used in an ultra-thin large-screen projection television receiver. Reference numeral 14' denotes an eccentric Fresnel screen, and the entire set consists of the aforementioned projection block 6 (FIG. 11) combined in the same manner as explained in FIG. 10.

Moreover, FIG. 21 is a diagram showing another embodiment according to the present invention,
As in the previous embodiment, a bright and clear image is projected to the viewer. That is, projection tube IC-1゜1G-2, IC,-3
, IG-4 and the lens 2 are arranged so that the optical axes m + "" ma of the lenses 2 face the viewing position 9, and optimally, the projection tubes IG-1 to IG-4 and the lens 2 intersect at one point. Other blue and red projection tubes, IB and IR, are also projection tubes IG-1.
- Arranged at a predetermined angle with respect to IG-4. Such a screen is more effective by using the Fresnel screens of the embodiments shown in FIGS. 1 to 3 and FIGS. 10, 18, and 20.

〔Effect of the invention〕

According to the present invention, a 100-inch large-screen television set is composed of four approximately 50-inch television receivers, so 10
Despite the large screen of 0 inches, the image performance is 5.
It is equivalent to a small screen projection television receiver of about 0 inches, and as a 100 inch large screen, resolution and brightness can be improved compared to conventional ones, and color shift and color unevenness can be reduced. In addition, the cathode ray tube of the 100-inch large screen television receiver,
All major parts such as lenses, mirrors, and screens are 5
Since it can be shared with a small screen TV set of about 0 inches,
Although it is a 100-inch large screen TV set,
The depth of the set can be made the same as a small screen television set of approximately 50 inches, and the cost and weight can be reduced to the same level as four 50-inch television sets. In addition, the four 50-inch TVs that share 1/4 of the 100-inch large screen can be separated, so the 1/4-screen set can be transported separately, even though the 100-inch large screen is It can also be easily transported.

[Brief explanation of the drawing]

1 to 3 are front views showing one embodiment of the present invention, FIG. 4 is a sectional view taken along line AA' in FIG. 1, and FIG. 5 is a blue (B), green (G), red (R) projection tube (cathode ray tube)
FIG. 6(a) is a plan view showing the planar arrangement of the lens and the lens placed in front of each, and the characteristics showing the relationship between the relative brightness IR of red and the relative brightness IB of blue on the screen with respect to the concentration angle θ. 6(b) shows the color shift Δ1. Δ
A characteristic diagram showing the relationship between F and the concentration angle θ, Figure 7 is an explanatory diagram showing the depth dimension of the set and the screen center height, and Figure 8 shows the depth dimension and screen center when the projection distance is used as a parameter. A characteristic diagram showing the relationship between heights, FIG. 9 is a schematic diagram explaining the angle of view, FIG. 10 is a perspective view showing the appearance of an embodiment of the present invention, and FIG. 11 is a perspective view showing the configuration of the projection block. 12 is a sectional view taken along the line A-A in FIG. 10, and FIG. 13 is a partially enlarged view showing the configuration of the transmission screen in FIG. 12.
FIG. 14 is a perspective view showing the viewing situation of the large screen, FIG. 15 is a perspective view showing the configuration of the large linear Fresnel screen,
Fig. 16 is a sectional view taken along line B-B in Fig. 15, Fig. 17 is a characteristic diagram showing the relationship between the diagonal position of the linear Fresnel screen and the angle of the linear Fresnel surface, and Fig. 18 shows another embodiment of the present invention. 19 is a sectional view of the Fresnel screen, FIG. 20 is a partially broken sectional view of the eccentric Fresnel screen,
FIG. 21 is a perspective view showing another embodiment of the present invention. Explanation of symbols IC, IR, IB... Projection tube, 2...
Lens, 3.3-1 ~ 3-4... Optical prong, 4,4-1 ~ 4-4... Mirror, 5.5-1 ~
5-4... Transparent screen, 6... Projection block, 11... Fresnel screen, 1
2... Linear Fresnel screen, 13...
...Lenticular screen, 18...Large screen, 20...Linear Fresnel surface,
14'...Eccentric Fresnel, D...Depth dimension, θ...Concentration angle, γ...Half of the angle of view, δ... Angle of Fresnel surface, a...
・Fresnel Central Agent Patent Attorney Akio Namiki Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Tomi Figure 9 1 Figure 10 Figure 11 Figure 12 Figure 13 Do U Figure 14 Figure 16 Figure 17 Linear panel screen length η ff1l!l X (
mm) Figure 18

Claims (1)

[Scope of Claims] 1. Three projection television receivers each having a screen composed of four quadrants and projecting red, green, and blue images onto the same screen including at least a Fresnel screen, and the screen. Four sets of projection optical systems are arranged for each of the quadrants, and each optical system has one set of projection optical systems.
The image content is divided into 1/4 of the screen, and the total image content is divided into 4 parts.
A projection type television receiver characterized in that said one screen is formed of two quadrants. 2. In the projection type television receiver set forth in claim 1, the projected image from the projection type television receiver disposed corresponding to any one of the four quadrants may be adapted to correspond to another quadrant. 1. A projection type television receiver characterized in that the image is projected onto a screen arranged as shown in FIG. 3. In the projection television receiver set forth in claim 1, the projected image from the projection television receiver disposed corresponding to any one of the four quadrants corresponds to the same quadrant. 1. A projection type television receiver characterized in that the image is projected onto a screen arranged as shown in FIG. 4. In the projection type television receiver set forth in claim 2, a projection image from the projection type television receiver arranged corresponding to any odd quadrant among the four quadrants may be projected to other odd quadrants. Project it onto a correspondingly placed screen,
On the other hand, a projection type characterized in that a projected image from a projection type television receiver arranged corresponding to any even-numbered quadrant among the four quadrants is projected onto a screen arranged corresponding to another even-numbered quadrant. TV receiver. 5. In the projection television receiver set forth in claim 2, the projected image from the projection television receiver disposed corresponding to the first quadrant of the four quadrants is arranged to correspond to the second quadrant. A projection image from a projection television receiver placed corresponding to the second quadrant is projected onto a screen placed corresponding to the first quadrant, and a projection image from a projection television receiver placed corresponding to the second quadrant is projected onto a screen placed corresponding to the first quadrant. The projected image from the placed projection television receiver is projected onto the screen placed corresponding to the fourth quadrant, and the projected image from the projection television receiver placed corresponding to the fourth quadrant is projected onto the third quadrant. A projection type television receiver characterized by projecting onto a correspondingly arranged screen. 6. In the projection type television receiver set forth in claim 2, the projected image from the projection type television receiver arranged corresponding to the first quadrant of the four quadrants is arranged to correspond to the fourth quadrant. A projection image from a projection television receiver placed corresponding to the fourth quadrant is projected onto a screen placed corresponding to the first quadrant, and a projection image from a projection television receiver placed corresponding to the fourth quadrant is projected onto a screen placed corresponding to the first quadrant. The projected image from the arranged projection television receiver is projected onto the screen arranged corresponding to the third quadrant, and the projected image from the projection television receiver arranged corresponding to the third quadrant is projected onto the second quadrant. A projection type television receiver characterized by projecting onto a correspondingly arranged screen. 7. The projection type television receiver according to any one of claims 3 to 6, wherein the screen has a Fresnel lens surface formed concentrically on at least one side. A linear Fresnel screen having Fresnel lens surfaces arranged in a straight line is inserted between the lenticular screen having a large number of cylindrical lens groups and a diffusing material mixed therein. 1. A projection television receiver comprising a screen. 8. In the projection type television receiver according to any one of claims 3 to 6, the Fresnel center of the Fresnel screen has a concentric Fresnel lens surface on at least one side. For Fresnel screens in the first quadrant, diagonally downward to the left on the diagonal of the Fresnel screen, for Fresnel screens in the second quadrant, diagonally downward to the right on the diagonal of the Fresnel screen, and in the third quadrant. For the Fresnel screen in the fourth quadrant, the projection type is eccentric to the upper right direction on the diagonal line of the Fresnel screen, and for the Fresnel screen in the fourth quadrant, it is eccentric to the upper left direction on the diagonal line of the Fresnel screen. TV receiver. 9. The projection type television receiver according to claim 5, characterized in that three projection type television receivers that project red, blue, and green images in each quadrant are arranged in-line with each other. A projection television receiver. 10. In the projection television receiver according to claim 8 or 9, the optical axis of the projected image from at least the green projection television receiver arranged in each quadrant is one as a whole. A projection type characterized in that at least a green projection type television receiver is mounted at a predetermined angle with respect to the vertical and horizontal directions so as to intersect at an arbitrary point in front of the screen when a large screen is formed. TV receiver. 11. In the projection type television receiver according to any one of claims 1 to 10, the projection optical system for each quadrant is housed in one housing, and a projection block is provided. 1. A projection television receiver, wherein each projection block functions as a projection television receiver. 12. In the projection type television receiver according to any one of claims 1 to 10, the viewing distance with respect to the screen is L, and the lens included in the projection optical system is located close to the screen. Distance L0 along the optical axis direction from
and a distance EW_c from the screen axis along the direction perpendicular to it, the Fresnel center of the Fresnel screen in each quadrant is eccentric by Δh given by Δh≒L0・W_c/(L+L0). A projection type television receiver characterized by the following features.