JPWO2019130837A1 - Projection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel projection system capable of eliminating disturbance light changing due to various factors in a projection system including a projection device for projecting an image and a screen on which the image is projected. is there. SOLUTION: The projection device includes a light source unit and a light-shielding unit extending around the light source unit, and the screen has optical elements that change the traveling direction of light rays from the light source unit in the vertical and horizontal directions. A plurality of the optical elements are arranged, and each of the optical elements directs a light ray to a different specific position in the audience area depending on the position of light incident from the light source unit, and the light-shielding unit is any of the light-shielding units in the audience area. Even when viewed from the position, the entire area of each of the optical elements is configured to reflect only the range of the light-shielding portion. [Selection diagram] Fig. 1

Description

The present invention relates to a projection system that projects light from a projection device onto a screen.

In recent years, it has become common practice to project an image on a large screen using a projection device (projector). At this time, the projected light from the projection device is generally diffusely reflected by a large screen to project an image or video.

In such a conventional projection method, the screen is irradiated not only with the projected light but also with ambient light (light from the outside other than the projection device). Therefore, for example, in a bright environment, the contrast of the projected image is lowered and the screen is displayed. There is a problem that the above image or video becomes difficult to see.
In response to such a problem, Japanese Patent Application Laid-Open No. 2010-96883 (Patent Document 1) provides a light absorbing film on a screen, and the light absorbing film is formed on a region corresponding to ambient light to cause disturbance. It is described to suppress the influence of light.

However, the method described in Patent Document 1 can deal only with a specific expected disturbance light, and is sufficient when the direction of the disturbance light changes with time or when another disturbance light is irradiated. There is a problem that it does not work. Therefore, the reality is that a fundamental solution to eliminate ambient light has not yet been realized.

JP-A-2010-96883

In view of the above-mentioned problems of the prior art, the present invention is a novel projection capable of eliminating ambient light that changes due to various factors in a projection system that projects an image on a screen using a projection device (projector). It provides a system.

In order to solve the above problems, in the projection system according to the present invention, the projection device includes a light source unit and a light shielding unit extended around the light source unit, and the screen is from the light source unit. A large number of optical elements that change the traveling direction of the light rays are arranged vertically and horizontally, and each of the optical elements directs the light rays to different specific positions in the audience area depending on the position of light incident from the light source unit. The light-shielding portion is characterized in that the entire area of each optical element reflects only within the range of the light-shielding portion when viewed from any position in the audience area.
Further, it is preferable that the optical element is composed of a reflector.
Further, it is preferable that the optical element is composed of a translucent optical lens.

Further, a plurality of light source units may be provided within the range of the light-shielding unit, and the light rays from each light source unit may be directed by the optical element to different specific partial regions in the audience area.
Further, it is preferable that adjacent light source units are arranged at an interval of approximately 1/2 of the light blocking range specified by one light source unit.
Further, it is preferable that adjacent light source units are arranged at intervals smaller than approximately 1/2 of the light blocking range specified by one light source unit.
Further, it is preferable that adjacent light source units are arranged at intervals larger than approximately 1/2 of the light blocking range specified by one light source unit.

According to the present invention, in a projection system including a projection device and a screen, the projection device includes a light source unit and a light-shielding unit extending around the light source unit, and the screen is transmitted from the light source unit. A plurality of optical elements that change the traveling direction of the light beam are arranged vertically and horizontally, and the entire area of each optical element is within the range of the light-shielding portion when viewed from any position in the audience area. Since the light is configured to reflect only the light, the light incident on the light emitting element from a region other than the light-shielding portion of the projection device travels to a position outside the audience region, and is therefore visible to the audience as ambient light. The audience can always see a clear image without any problems.

The conceptual diagram of the 1st Example of this invention. The conceptual diagram explaining the operation at different positions of 1st Example. Explanatory drawing of a light-shielding part. Explanatory drawing of the shading part at different positions in the audience area. Conceptual diagram of the reflecting part and the light incident position seen from the central part of the audience area. Conceptual diagram of the reflecting part and the light incident position seen from one end of the audience area. Conceptual diagram of the reflecting part and the light incident position seen from the other end of the audience area. Explanatory drawing of the effect of this invention. The explanatory view of the specific parameter of the Example of this invention. The conceptual diagram of the 2nd Example. The conceptual diagram of the 3rd Example. Explanatory drawing of the light-shielding part at different positions of the audience area in the 3rd Example. The conceptual diagram of the 4th Example. Explanatory drawing of a light-shielding part and a partial area in 4th Example. The explanatory view of the light source part and the light-shielding part at different positions of the audience area in 4th Example. FIG. 15 is an explanatory view of a light-shielding portion at each audience position in FIG. Examples of arrangement of a plurality of light source units (A to C) of the fourth embodiment. An example in which different parallax images are projected from each light source unit in the fourth embodiment. A specific example of a projection system based on the fourth embodiment of the present invention.

A first embodiment of the present invention is shown in FIG. 1, in which a projection system 1 comprises a projection device 2 for projecting an image or an image (hereinafter, simply referred to as an image) and a screen 3 on which the image is projected. I have.
The projection device 2 includes a light source unit 21 and a light-shielding unit 22 extending around the light source unit 21.
On the other hand, the screen 3 is composed of a screen in which a plurality of optical elements 31 are arranged vertically and horizontally. The screen 3 in the present invention does not necessarily have to have the optical elements 31 aligned in one direction, but may be arranged so as to spread in a plane.
Further, the optical element 31 referred to here is a member that changes the traveling direction of light rays by an optical action such as reflection or bending, and is made of, for example, a concave or convex reflector or a translucent material. An optical lens or the like can be used.

In the first embodiment of FIG. 1, an embodiment in which a reflector is used as the optical element 31 is shown, and the reflector is composed of screens arranged vertically and horizontally. Each reflector has a different form of an optical element 31 such as a shape and an inclination depending on an installation location, and changes the traveling direction of a light ray from the light source unit 21.
Further, a spectator area 4 is provided so as to face the screen 3 and accommodates an spectator who visually recognizes an image projected on the screen 3, and the light source unit whose optical path is changed by the optical element 31. The light beam from 21 is applied to any specific position in this audience area 4.
Then, the light from the light source unit 21 of the projection device 2 is projected over the entire area of the screen 3 and reflected by the plurality of optical elements 31 constituting the screen 3. Then, depending on the position of light incident from the light source unit 21 in each optical element 31, the reflected light from the optical element 31 is irradiated to a specific position (for example, position A in FIG. 1) in the audience area 4. As a result, the audience L at the position A can visually recognize the image projected on the entire screen 3.

FIG. 2 illustrates a ray trajectory when the spectator M is located at one end (left end in FIG. 2) in the audience area 4. At this position B, similarly to the position A, the light projected from the light source unit 21 is reflected by each optical element 31 of the screen 3, and the reflected light from each of the optical elements 31 is the position B of the audience area 4. Is irradiated to.
At this time, the light incident positions of the corresponding optical elements 31 are different between the position A and the position B in the audience area. In this way, the reflected light from each optical element 31 is directed to a different observation position (position A, position B) in the audience area 4 depending on the light incident position (reflection position) on each optical element 31. Therefore, even if the position of the spectator in the audience area 4 changes, the image or video projected on the screen 3 can be visually recognized.

In addition, in FIG. 2, even when the spectator N is located at the other end (right end in FIG. 2) (position C) in the spectator area 4, the ray trajectory is not shown in order to avoid complications. Similarly, the light from the light source unit 21 is incident on a different light incident position of the optical element 31, reflected here and directed to the position C of the audience area 4, and the audience N at the position C is displayed on the screen 3. The projected image can be visually recognized.

FIG. 3A conceptually shows the relationship when an arbitrary optical element 31 in the screen 3 is taken out and the optical element 31 is observed from the central position A of the audience area 4.
The light ray directed from the light source unit 21 to the position A via the optical element 31 is a light ray that is incident on the position X of the optical element 31 and reflected there. That is, at the position A of the audience area 4, the reflected light from the position X of the optical element 31 can be observed. Further, the positions Y and Z of the optical element 31 have a corresponding relationship in which the light-shielding portion 22 is reflected. Therefore, since there is no reflected light beam directed to the position A at the position Y and the position Z, the light from the position Y and the position Z cannot be observed at the position A. Therefore, from the audience L at the position A, only the reflected light beam from the position X of the optical element is observed as the bright spot 5.
FIG. 3B shows the relationship between the light incident positions (bright spots 5) in the optical element 31 that can be visually recognized from the audience L at the central position A. In this case, the projection range (the width of the light-shielding portion 22) ( In Wx), the bright spot 5 is visually recognized in the central portion.

FIG. 4A shows the relationship when the observation position (audience position) is changed in the conceptual diagram shown in FIG.
That is, when one end (left end) of the audience area 4 is the position B and the other end (the right end) is the position C, the case where the optical element 31 is observed at each position is shown.
When the optical element 31 is viewed from the left end position B, the light incident position from the light source unit 21 is reflected as a bright spot in the position Y of the optical element 31 (the left end region of the optical element 31 in FIG. 4A). The light-shielding portion 22 is reflected in the other positions X and Z.
When the optical element 31 is viewed from the rightmost position C, the light incident position from the light source unit 21 is reflected as a bright spot at the position Z of the optical element 31 (the right end region of the optical element in FIG. 4A). , The light-shielding portion 22 is reflected in the other positions X and Y. That is, the region of the projection range reflected on the optical element 31 is partially different between the position B and the position C. Therefore, when the audience area 4 is large, the projection range and the light source unit so that only the light source unit 21 and the light source unit 22 within the projection range are reflected when the optical element 31 is viewed from each observation position (A, B, C). It is necessary to set the position of 21.

In this way, although the light incident position (reflection position) of the optical element 31 seems to differ depending on the observation position (A, B, C) of the audience area 4, the projection range (Wx) which is the width of the light-shielding portion 22 in the audience area 4 ) Is reflected in the optical element 31, so that the ambient light does not enter the audience area 4.
FIGS. 4B and 4C show the relationship between the light incident positions (bright spots 5) in the optical element 31 that can be visually recognized by the spectators B and C, respectively.
When the size of the optical element 31 is very small, even if the observation position in the audience area 4 changes, the deviation of the light incident position (position of the bright spot 5) in the optical element 31 is almost invisible, so that the projected image is projected. There is no hindrance to browsing.

5 to 7 show a conceptual diagram when a plurality of optical elements 31 described with reference to FIGS. 3 and 4 are arranged vertically and horizontally to form a screen.
In FIGS. 5 to 7, an example of a screen in which eight optical elements 31 are arranged in each of the vertical direction and the horizontal direction is shown. However, although it depends on the size of the screen, it is actually arranged from the viewpoint of resolution. The number is an array at the level of thousands x thousands.

FIG. 5 is a conceptual diagram when the screen 3 is viewed from the audience L at the central position (A) of the audience area 4, and the projected light is projected from the projection device over the entire area of the screen 3. The light from the light source portion of the projection device is projected onto each optical element 31 of the screen 3 at the central position X as shown in FIG. 3B, and a bright spot 5 is formed at the position X. As a result, the spectator A can visually recognize the image projected on the screen 3.

6 and 7 show the case where the spectator position moves in the spectator area 4, FIG. 6 shows the case where the spectator M is at the left end of the spectator area 4, and FIG. 7 shows the spectator N at the right end. Shows the case. When the audience position changes in this way, the light incident position (reflection position) formed on each optical element 31 of the screen 3 changes, and the bright spot 5 also moves accordingly.
However, the light projected over the entire screen 3 is reflected by each optical element 31, and different observation positions A to C in the audience area 4 depending on the reflection position (light incident position from the light source unit) in the optical element 31. By guiding the light rays to (audiences L to N), it becomes possible to visually recognize the same image even from different observation positions.
As described above, each optical element directs a light beam to a different specific position in the audience area depending on the position of light incident from the light source unit. Further, this optical element guides a light beam to a specific position and otherwise reflects only a light-shielding portion, so that ambient light does not enter.

As described above, it is possible to increase the resolution by increasing the number of optical elements constituting the screen in the projection region of the projected light. Further, as the number of optical elements installed increases, fluctuations in the reflection points (bright spots) shown in FIGS. 5 to 7 are hardly recognized, and it can be understood that the image from the projection device is appropriately visually recognized in the audience area. ..

Next, the reason why the influence of ambient light is suppressed by the projection system of the present invention will be described below with reference to FIG.
Each optical element 31 provided on the screen 3 has a configuration in which a projection range (Wx), which is the width of the light-shielding portion 22 of the projection device 2, is reflected in the audience area 4. Therefore, even if the light P in the region outside the projection range (Wx) is reflected by the optical element 31, the light P travels outside the audience region 4 and is not irradiated into the audience region 4. Further, since the light Q in the region inside the projection range (Wx) is originally blocked by the light-shielding portion 22, the light does not reach the screen 3 and is not irradiated in the audience region 4. In this way, since the ambient light does not enter the audience area 4, the ambient light on the screen is not visually recognized.
With the above configuration, the projection system shown by the present invention can project an image on a screen without being affected by ambient light, and can project an image with high contrast even in an environment with strong ambient light such as outdoors. It will be possible.

In the screen according to the present invention, it is necessary to arrange a plurality of optical elements under individually determined conditions. Further, in order to increase the resolution, the width of the optical element may be designed to be several mm to several μm, and in that case, a screen in which fine three-dimensional patterns are arranged can be obtained. In this way, the width of the optical element is appropriately set according to the required resolution and the distance between the screen and the audience area.

FIG. 9 shows the parameters related to the embodiment of the present invention, and the following is a numerical example of the entire projection system of the present invention.
-Screen width (Ws): 1000 mm
-Distance between screen and projection device (Dsp): 2000 mm
・ Audience area width (We): 3000 mm
-Distance between screen and audience area (Dse): 5000 mm
・ Optical element width (Wm): 1 mm
-Shape of optical element: Convex shape The vertical direction of the screen also follows the above design.

The radius of curvature (R) of the optical element at the center of the screen can be calculated by the following formula.
Radius of curvature (R) = 1 / (arctan (We / Wse))
= 1 / (arctan (3000/5000)) = 1.85 mm
The inclination (θ) of the optical element at the edge of the screen where the inclination angle [°] of the optical element is the largest with respect to the reference axis of the optical element at the center of the screen can be calculated by the following formula. The other optical elements can be calculated by substituting the distance from the center position of the screen into the calculation formula.
Slope (θ) = arctan ((Ws / 2) / Wse)
= Arctan (500/5000) = 5.7 [°]
-The required width (Wx) of the light-shielding portion can be calculated by the following formula.
Wx = 2 × Dsp × tan (2θ)
= 2 x 2000 [mm] x tan (11.4 [°]) = 810 mm or more

In the above-described embodiment, the optical element 31 constituting the screen 3 has been described as a convex reflector, but the present invention is not limited to this shape. The optical element 31 may have a configuration in which only the set projection range (installation range of the light source unit 21 and the light shielding unit 22) is projected onto each observation (audience) position in the audience area 4, for example. , It may be a concave shape or a flat plate shape.

Further, as in the second embodiment shown in FIG. 10, the convex optical element (FIG. 10 (A)) shown in the examples shown in FIGS. 1 and 1 is divided into two at the central portion and connected to the opposite side. (FIG. 10 (B)) can also be used.
The optical path from the light source unit 21 of the projection device 2 to the audience M in the audience area 4 via the optical element 31 in this embodiment is shown in FIG. 10 (C).
Further, the shape of the screen 3 does not have to be flat, and it may be a curved surface or a three-dimensional screen in which the screen is arranged in a circumferential shape.

Further, although it has been described that only one light source unit is formed in the projection device, there is no problem even if there are a plurality of light source units. The projection range (Wx) composed of the light source unit and the light-shielding unit is not limited in the arrangement form, and various arrangements can be adopted. In addition, the shape and size of the reflector may be set arbitrarily with reference to the above formula, and if the design is based on the geometrical relationship, taking into account the configuration of the projection device, the configuration of the screen, and the configuration of the audience area. Good.
Further, in the embodiment described in the present invention, the audience area is assumed to be a plurality of spectators, but the present invention is not limited to this, and even a projection system for one person (designed to have a narrow audience area) is not limited to this. I do not care.

Further, in the above embodiment, the optical element 31 is used as a reflector, but a transmissive optical lens may be used.
FIG. 11 shows a third embodiment in which the optical element 31 is an optical lens. In this embodiment, the projection device 2 is provided on the back side (upper side in FIG. 11) of the screen 3. The light projected from the projection device 2 onto the back side of the screen 3 is incident on the position D and the position E of the optical lens (optical element) 31, respectively, is transmitted through the optical lens 31 and is bent, and is formed in the audience area 4. The light is focused on the observation position C and the observation position B. As a result, the spectator M and the spectator N can each recognize the image projected on the screen 3.

Here, the light beam from the light incident position E of the optical lens (optical element) 31 is directed to the observation position C, and the light ray from the light incident position D of the optical lens 31 is directed to the observation position B. Here, the light incident position refers to an arbitrary position on the incident surface of the single optical lens 31. With the above configuration, each optical lens 31 arranged on the screen 3 can observe an image at each position in the audience area 4 by directing light at different light incident positions to each audience position. ..

FIG. 12 shows a case where the optical lens (optical element) 31 is observed at each position of the position B at one end and the position C at the other end of the audience area 4 in the conceptual diagram shown in FIG. ..
When the optical lens 31 is viewed from the left end position B, the light incident position from the light source unit 21 is the position D of the optical element 31, and is reflected as a bright spot in the right end region of the optical lens 31 in FIG. In addition, the other positions are in a relationship of reflecting the light-shielding portion 22.
On the other hand, when the optical lens 31 is viewed from the rightmost position C, the light incident position from the light source unit 21 is the position E of the optical lens 31, and is reflected as a bright spot in the left end region of the optical lens 31 in FIG. In addition, the other positions are in a relationship of reflecting the light-shielding portion 22. That is, the region of the projection range reflected on the optical lens 31 is partially different between the position B and the position C. As a result, no matter where the optical lens 31 is viewed from any position in the audience area 4, only the light source unit 21 and the light-shielding unit 22 in the projection area are projected, so that ambient light can enter the audience area 4. Absent.
When the audience area 4 is large, it is necessary to set the projection range and the position of the light source unit 21 so that when the optical lens 31 is viewed from each observation position, only the light source unit 21 and the light source unit 22 within the projection range are projected. is there.

Here, the light incident on and transmitted through the optical lens (optical element) 31 of the screen 3 from a region other than the light-shielding portion 22 in the projection device 2 is emitted to a region other than the audience region 3 without being incident on the audience region 4. Is easily understood in the light of the description of FIG.
By using the screen 3 in which such optical lenses 31 are arranged vertically and horizontally and using the device configuration according to the present invention, the light source unit 21 of the projection device 2 incidents on each optical lens 31 of the screen 3 and transmits the light. All the light is emitted to any position of the audience area 4, while the light (turbulent light) that is incident on and transmitted to the optical lens 31 from the area other than the light-shielding portion 22 is not emitted to the audience area 4. A projection system 1 that eliminates ambient light can be realized.

As described above, according to the present invention, in a projection system including a projection device and a screen, the projection device includes a light source unit and a light-shielding unit extending around the light source unit, and the screen. However, a plurality of optical elements that change the traveling direction of the light beam from the light source unit are arranged vertically and horizontally, and each of the optical elements is located at a specific position in the audience area depending on the light incident position from the light source unit. The light source is directed to the light source, and the light-shielding portion is configured so that the entire area of each optical element reflects only the range of the light-shielding portion when viewed from any position in the audience area. All the light incident on the optical element of the screen from the light source unit is incident on any position in the audience area and is visible to all the spectators in the audience area.
Then, the light incident on the light emitting element from the region other than the light-shielding portion of the projection device travels to a position outside the audience region, so that the light is not visually recognized by the audience as ambient light, and the audience always has a clear image. Can be visually recognized.

In the above embodiment, a single light source unit has been described, but a plurality of light source units may be provided, and a fourth embodiment thereof will be described below.
FIG. 13 shows the conceptual diagram, and a plurality of light source units 21 (211 and 212) provided in the projection device 2 are provided within the range (light-shielding range) of the light-shielding unit 22 (two in this example). The form is shown. The light rays from the light source units 211 and 212 are directed to different specific partial regions H1 and H2 in the audience region 4 by the optical elements 31 constituting the screen 3, respectively. Here, the partial areas H1 and H2 refer to a part of the area partitioned within the audience area 4. Further, as will be described later, the partial regions H1 and H2 may be configured to overlap each other or may be configured to be separated from each other.

FIG. 14 conceptually shows the relationship when an arbitrary optical element 31 in the screen 3 is taken out in the embodiment shown in FIG. As shown in FIGS. 13 and 14, a plurality of light source units 211 and 212 are provided within the range (light-shielding range) of the light-shielding unit 22, and the audience area 4 corresponds to each light source unit 211 and 212. Partial regions H1 and H2 are formed. As a result, the light projected from the plurality of light source units 211 and 212 is directed to the audience area 4. Thereby, for example, the audience area can be easily expanded without changing the design of the optical elements constituting the screen. It is also possible to realize high-intensity light projection by designing a narrow partial area within the audience area.

Further, the optical units 211 and 212 may be configured to project the same image, but may be configured to project different images. For example, to explain the case of projecting different images, the partial regions H1 and H2 corresponding to the light source units 211 and 212 are irradiated with light from different light source units. That is, by making the image projected from the first light source unit 211 different from the image projected from the second light source unit 212, different images can be visually recognized in the partial regions H1 and H2 in the audience area 4. Therefore, the projected image can be changed depending on the observation location.

FIG. 15 is an explanation of the light source unit 21 and the light shielding unit 22 at different positions in the audience area 4, and is an explanation in the case where the partial regions H1 and H2 corresponding to the light source units 211 and 212 are arranged so as to be continuous. FIG. 16 is an explanation of the light-shielding portion 22 at each audience position A to F in the case of the arrangement of FIG. 15, and the optical element 31 (311) is described from each observation position (A to F) in the audience area 4. It conceptually shows the relationship when observing 312).
When the optical element 31 is observed from the observation position A in the audience area 4, the range reflected on the optical element 31 is the positions a to c (range P) of the light-shielding portion 22.
As shown in FIG. 16, since the first light source unit 211 is arranged at the position c here, the position c can be observed as a bright spot. In this way, the position c is reflected in the position Z of the optical element 31, and the position Z of the optical element 31 is reflected as a bright spot at the observation position A.
Similarly, when the optical element 31 is observed from the observation position B, the range reflected on the optical element 31 is the positions b to d (range Q) of the light-shielding portion 22. Here, since the first light source unit 211 is arranged at the position c, the position c can be observed as a bright spot. In this case, the position c is reflected in the position X of the optical element 31, and the position X of the optical element 31 is reflected as a bright spot at the observation position B. By changing the observation position in this way, the range of the light-shielding portion reflected on the optical element changes.

Next, when the optical element 31 is observed from the observation position C in the audience area, the range reflected on the optical element 31 is the positions c to e (range R) of the light-shielding portion 22. Here, since the first light source unit 211 is arranged at the position c, the position c can be observed as a bright spot. In this case, the position c is reflected in the position Y of the optical element 31, and the position Z of the optical element 31 is reflected as a bright spot at the observation position C.

Next, when the optical element 31 is observed from the observation position D, the range reflected on the optical element 31 is the positions d to f (range S) of the light-shielding portion 22. Here, the first light source unit 211 is arranged at the position c, but since it is not reflected in the optical element 31, the light of the first light source unit 211 arranged at the position c is confirmed from the observation position D. It is not possible. On the other hand, since the other second light source unit 212 is arranged at the position f, the position f can be observed as a bright spot. In this case, the position f is reflected in the position Z of the optical element 31, and the position Z of the optical element 31 is reflected as a bright spot at the observation position D. In this way, the light of the corresponding light source units 211 and 212 can be observed in the respective subregions H1 and H2.

FIG. 17 illustrates the arrangement interval of a plurality of light source units arranged within the range of the light source unit 22, and each light source unit (211, 212, 213, 214) has a light shielding range corresponding to each. Exists. This indicates the observation range of the light-shielding portion observable from the specific partial region when the light ray from one light source portion is directed to a specific partial region in the audience area by the optical element, and each light source. The light-shielding range specified depends on the part.

Here, FIG. 17A shows a plurality of (three) light source units 211 to 213, and each light source unit 211 to 213 is arranged within the range of the light shielding unit 22 at predetermined intervals, and one of them. Each light source unit is arranged at an interval (1/2 interval) L1 that is half of the light shielding range M specified by the light source unit (L1 = M / 2). As a result, the projected images can be projected in the audience area without interruption by arranging the partial areas in the audience area to be connected to each other.

Further, in FIG. 17B, a plurality of (4) light source units 211 to 214 are arranged within the range of the light source unit 22 at predetermined intervals, which is half of the light source range M specified by one light source unit. Each light source unit is arranged at an interval smaller than 1 (an interval smaller than 1/2) L2 (L2 <M / 2). As a result, the partial areas in the audience area are arranged so as to overlap each other, and the projected image can be projected in the audience area without interruption. For example, when the spectator himself observes different images while moving the viewpoint, there is an effect that the transition (switching) of each image becomes smoother.
When the light source units 211 to 214 project different images, different images are projected in each partial region in the audience area. Therefore, when the viewpoint is moved between the partial regions, the partial region Since the image is visually switched before and after the boundary, it may give an uncomfortable feeling to the observer. In such a case, by arranging the partial areas in the audience area so as to overlap each other, it becomes difficult to visually recognize the change of the image between the partial areas, and the change of the image is recognized more smoothly.

Further, in FIG. 17C, a plurality of (three) light source units 11 to 213 are arranged within the range of the light source unit 22 at predetermined intervals, which is half of the light source range specified by one light source unit. Each light source unit is arranged at an interval larger than (L3> M / 2) of L3 (L3> M / 2). As a result, the partial areas in the audience area are arranged so as to be separated from each other, and it is possible to form an area in which the image is not reflected in the specific area in the audience area.
For example, if there is a part of the place where people other than the audience come and go due to the convenience in the facility where the projection is performed, the part of the area can be set as an invisible environment. It is also effective when a different image is projected and the switching of the image is intentionally clearly recognized.

By the way, although a stereoscopic display method using a plurality of parallax images is known (for example, Japanese Patent Application Laid-Open No. 2010-54917), the present projection system can be used as a means for realizing the method.
The projection system of the present invention can perform a three-dimensional display by projecting parallax images when an object is viewed from different viewpoints.
FIG. 18 conceptually shows an embodiment in which a plurality of light source units (121 to 215) are arranged within the range of the light shielding unit 22, and different parallax images (P211 to P215) are projected on each light source unit. It is a thing. A plurality of partial regions (H1 to H5) are formed in the audience area 4 corresponding to each light source unit (121 to 215), and different parallax images are formed in each of the partial regions (H1 to H5). It is projected. Such a configuration enables a three-dimensional display.

FIG. 19 illustrates an embodiment of a projection system that enables stereoscopic display according to the present invention. This embodiment shows a configuration for personal projection, which includes two light source units 211 and 212 for projecting a parallax image, and allows one spectator arranged in the center of the screen 3 to visually recognize a stereoscopic display. , Specific numerical examples are shown below.
-Screen width (Ws): 300 mm
-Distance between screen and projection device (Dsp): 100 mm
・ Audience area width (We): 60 mm (assuming the width of both eyes of the audience)
-Distance between screen and audience area (Dse): 500 mm
-Number and spacing of light source units in the projection device: 2, spacing 100 mm
-Optical element width (Wm): 0.1 mm
-Shape of optical element: Convex shape-Radius of curvature of optical element: 0.3 mm
-Mirror in the center of the screen: The spread angle is 26 degrees, and the inclination of the mirror center axis with respect to the center line of the screen is 0 degrees.
-Mirror in the center of the screen: The spread angle is 9 degrees, and the inclination of the mirror center axis with respect to the center line of the screen is 59 degrees.

As described above, in the present invention, a light-shielding portion is formed around the light source portion, and it is possible to prevent the mixture of ambient light and stray light in the audience area, even in a bright environment such as outdoors. A clear stereoscopic image can be projected. In addition, by increasing the number of light source units, many parallax images can be projected, enabling stereoscopic viewing with a sense of reality.

Furthermore, as the number of light source units installed is increased and the spacing between partial areas is narrowed, the change in the image when the viewpoint is moved becomes smoother, making it possible to display a more realistic stereoscopic image. Become. In addition, by narrowing the distance between the partial regions to about the distance between the right eye and the left eye, different parallax images can be visually recognized between the right eye and the left eye, enabling stereoscopic vision by binocular parallax and moving the viewpoint. It is also possible to perceive changes in the image due to motion parallax at that time, and a more realistic stereoscopic display becomes possible.

Further, as described in Japanese Patent Application Laid-Open No. 2002-258215, by designing the space between the partial regions to be narrow enough to allow a plurality of parallax images to enter one eye at the same time, the focus is adjusted to an actually existing three-dimensional object. It is possible to create the state of, and to perceive a three-dimensional image more naturally. As another means, by arranging each light source unit so that each partial region overlaps, a plurality of parallax images can be projected at a specific position, and by projecting a plurality of parallax images on one eye, it is more natural. It is also possible to enable a three-dimensional display.

The shape of the screen according to the present invention is not limited to a flat surface, and various shapes such as a curved shape and a pillar shape (cylindrical shape) can be adopted, and a dome shape that covers a part or all of the field of view. It doesn't matter.

Further, the optical element may have any shape as long as it directs the light beam projected from the light source unit to an arbitrary partial region. For example, a circular shape, an elliptical shape, a polygonal shape, or the like can be adopted depending on a partial region set arbitrarily, and a screen is configured by arranging these optical elements vertically and horizontally.

1: Projection system 2: Projection device 21: Light source unit 211-215: Each light source unit 22: Shading unit 3: Screen 31: Optical element 4: Audience area 5: Bright spot (light incident position)
M: Shading range H: Partial area

Claims (8)

In a projection system with a projection device that projects an image and a screen on which the image is projected.
The projection device includes a light source unit and a light-shielding unit extending around the light source unit.
In the screen, a plurality of optical elements that change the traveling direction of light rays from the light source unit are arranged vertically and horizontally.
Each of the optical elements directs a light beam to a different specific position in the audience area depending on the position of light incident from the light source unit, and also
The projection system is characterized in that the light-shielding portion is configured so that the entire area of each optical element reflects only within the range of the light-shielding portion when viewed from any position in the audience area. The projection system according to claim 1, wherein the optical element is composed of a reflector. The projection system according to claim 1, wherein the optical element is composed of a translucent optical lens. A plurality of the light source units are provided within the range of the light-shielding unit.
The projection system according to claim 1, wherein the light rays from each light source unit are directed by the optical element to different specific partial regions in the audience area. The projection system according to claim 4, wherein adjacent light source units are arranged at an interval of approximately 1/2 of the shading range specified by one light source unit. The projection system according to claim 4, wherein adjacent light source units are arranged at intervals smaller than approximately 1/2 of the shading range specified by one light source unit. The projection system according to claim 4, wherein adjacent light source units are arranged at intervals larger than approximately 1/2 of the shading range specified by one light source unit. The projection system according to claim 4, wherein each light source unit projects a different image.

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