JP2007218945A - Projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To project a panoramic image with full presence to a cylindrical-shaped screen at a low cost, dispensing with a special lens. <P>SOLUTION: This projection system includes: the cylindrical-shaped screen 2; a projector 3 having a projection lens member 3a for projecting projection light in a direction along the center axis of the screen 2; and a reflecting member 4 provided in the projecting direction of the projector 3, having a catoptric system for reflecting the projection light projected from the projection lens member 3a so as to project the panoramic image to the screen 2. The projector 3 is provided above the screen 2, the catoptric system provided in the reflecting member 4 is a convex mirror 11, and the convex mirror 11 is provided while aligning the optical axis of the mirror 11 with the optical axis of the projection lens member 3a. Only by reflecting the projection light projected from the projector 3 by the convex mirror 11, the panoramic image is easily projected to the screen 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection system that projects a panoramic image by projecting projection light from a projection lens member provided in a projector onto a cylindrical screen.

  Conventionally, as a technique for projecting a projection image from a projector onto a cylindrical screen and projecting a panoramic image, there is a technique disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-91449.

That is, in this publication, a panoramic image optical system is provided in which a projector is arranged with its projection direction facing the ceiling, and a panoramic circular image emitted from the projector is expanded at 360 ° in the emission direction of the projector. Further, a screen is disposed on the outer periphery of the panoramic image optical system. Then, the panoramic circular image emitted from the projector is developed at 360 ° by the panoramic image optical system and projected in a substantially horizontal direction, and the panoramic image is projected on the screen.
JP 2005-91449 A

  However, the technique disclosed in the above-mentioned publication requires a specially shaped optical system for developing a panoramic circular image projected from the projector at 360 °, which increases the manufacturing cost.

  Also, since the image incident on the panoramic image optical system is projected at a substantially horizontal direction after being developed at 360 ° by the panoramic image optical system, the panoramic image optical system has a substantially horizontal direction with respect to the screen. It is necessary to arrange in the area. As a result, the image projected on the screen cannot be viewed at the position where the panoramic image optical system is disposed, that is, the position where the viewer can obtain the most realistic feeling, and the realistic feeling is halved. There's a problem.

  In view of the above circumstances, an object of the present invention is to provide a projection system capable of projecting a realistic panoramic image onto a screen at a low cost without using a special optical system.

  In order to achieve the above object, the first invention provides a projector having a screen formed in a cylindrical shape, a projection lens member that projects projection light in a direction along the central axis of the screen, and a projection direction of the projector. And a reflecting member having a reflecting optical system that reflects the projection light from the projection lens member and projects a panoramic image on the screen. The projector is arranged in a direction along the central axis of the screen. The reflection optical system provided on the reflection member is formed in a convex shape, and the reflection optical system is arranged with the optical axis of the projection lens member aligned. It is characterized by that.

  In such a configuration, the panoramic image can be projected onto the cylindrical screen simply by reflecting the projection light projected from the projector with the reflection optical system, so that the structure is simple and the handleability is good. In addition, since the reflecting optical system is only formed in a convex shape, it is easy to manufacture, and a panoramic image full of realism can be projected on the screen at a low cost without using a special optical system. Furthermore, since the projector is arranged on one side in the direction along the central axis of the screen, a space is secured on the axis of the portion where the projector is arranged in the horizontal direction with respect to the screen. Since the panoramic image can be viewed on the axis on which the projector is disposed, the realistic sensation can be more effectively experienced.

  According to a second invention, in the first invention, the reflecting member is provided with an adjusting mechanism for adjusting a distance between the reflecting optical system and the projection lens member.

  In such a configuration, since the adjustment mechanism for adjusting the distance between the reflection optical system and the projection lens member is provided in the reflection optical system, display correction on the projector side becomes unnecessary, and the projector can be moved. In addition, the panorama image projected on the screen can be easily adjusted to an appropriate display state, so that handling is good.

  According to a third invention, in the first or second invention, the reflection optical system is a convex mirror provided to face the projection lens member.

  In such a configuration, since the reflecting optical system is a convex mirror, the structure becomes easy and the manufacturing cost can be reduced.

  According to a fourth invention, in the first or second invention, the reflective optical system is provided so as to face the projection lens member and reflect the projection light from the projection lens member, and the first convex mirror And a second convex mirror that reflects the reflected light from the convex mirror and projects the panoramic image on the screen.

  In such a configuration, the reflection optical system includes a first convex mirror that reflects the projection light from the projection lens member, and a second projection that projects the panoramic image on the screen by reflecting the reflection light from the first convex mirror. Since the convex mirror is used, the distance between the first convex mirror and the projector can be made closer, and the entire component can be made compact.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional side view schematically showing the configuration of the projection system, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG.

  A projection system 1 according to this embodiment includes a cylindrical screen 2, a projector 3, and a reflecting member 4, which are arranged in a room 5. In addition, a seat 14 is set almost at the center of the screen 2, and the viewer A is seated on the seat 14. In the figure, the viewer A and the screen 2 are described in a relatively close state. However, the screen 2 may have a larger radius, and the viewer A may Two or more people may be used.

  The screen 2 is self-supporting, and its outer wall 2a is formed of a relatively lightweight material such as plastic, and a projection surface 2c is formed on the inner periphery of the outer wall 2a. Further, an entrance / exit 2b is provided at the rear portion of the screen 2, and the entrance / exit 2b is freely opened and closed by a door 6. The inner surface of the door 6 is formed with the same curvature as the inner surface of the screen 2, and a projection surface 2c is formed. The projection surface 2c does not need to be formed on the entire inner surface of the screen 2, and has a visual field range (about 200 to 240 °) when the viewer A sitting on the seat 14 shakes his / her head from side to side. What is necessary is just to be covered, and projection to the back side of the viewer A may be omitted. When the projection on the back side of the viewer A is omitted, the projection surface 2c disposed on the back side can be omitted, and therefore the door 6 itself can be omitted. However, in the following description, a mode in which a panoramic image of the entire circumference is projected onto the projection surface 2c will be described, and a description of a mode in which projection on the back side of the viewer A will be omitted.

  The projector 3 is supported on the ceiling 5 a of the room 5 via a suspension member 7. As shown in FIG. 2, in this embodiment, the projector 3 is disposed on the central axis of the screen 2, but may be disposed at a position displaced in the front-rear direction.

  The suspension member 7 includes a seating surface 8 fixed to the ceiling 5 a, a mounting surface 9 for fixing the projector 3, and a mounting surface 9 for fixing the projector 3 between the seating surface 8 and the both surfaces 7, 8. And a stay 10 for connecting the two. The stay 10 is formed of a relatively thin and transparent member, and four corners between both surfaces 7 and 8 are connected.

  A boss portion 8a projects from the center of the portion of the seat surface 8 facing the mounting surface 9, and the projector 3 fixed to the mounting surface 9 has the projection lens member 3a oriented in the direction of the boss portion 8a. In addition, the optical axis of the projection lens member 3a and the central axis of the boss portion 8a are arranged to coincide with each other. The boss 8a is threaded with a screw hole.

  The reflecting member 4 has a convex mirror 11 as a reflecting optical system. The convex mirror 11 has a convex rotationally symmetric surface. As the convex mirror 11 having such a shape, the reflecting surface is a rotating hyperboloid formed on an elliptical curved surface or a parabolic curved surface having the optical axis as the central axis, or a conical reflecting surface having the optical axis as the central axis. There are cones and the like.

  As shown in FIG. 3, a screw shaft portion 11 a projects from the optical axis on the back surface of the convex mirror 11. The convex mirror 11 is opposed to the projection lens member 3 a provided in the projector 3 in a state where the screw shaft portion 11 a is screwed into the boss portion 8 a protruding from the seat surface 8 of the suspension member 7. In addition, the optical axes of the convex mirror 11 and the projection lens member 3a are matched.

  Further, the convex mirror 11 can adjust the distance L between the projection lens member 3a and the convex mirror 11 by an advancing and retreating operation when the screw shaft portion 11a is screwed into the screw hole of the boss portion 8a. Also, a set screw 12 such as a sword tip screw is screwed into the side surface of the boss portion 8a, and the tip of the set screw 12 is bitten into the screw shaft portion 11a to prevent the screw shaft portion 11a from loosening.

  The projector 3 is connected to the video player 16 and the personal computer 17 via a communication line 18 such as an indoor LAN. The video player 16 and the personal computer 17 reproduce images such as still images and moving images stored in image storage means (not shown) such as a DVD and HDD, and the reproduced image signals are transmitted to the communication line 18. Is transmitted to the projector 3 via. The projector 3 projects an image generated based on the image signal transmitted from the video player 16 or the personal computer 17 from the projection lens member 3a. Examples of the projector 3 include a liquid crystal projector, a DMD (Digital Micromirror Device) projector, and a DLP (Digital Light Processing) projector.

  Incidentally, a panoramic image is recorded in the image storage means (not shown). This panoramic image is captured by an imaging device such as a video camera using a convex mirror having a reflecting surface having the same shape as the convex mirror 11 provided on the reflecting member 4. Is recorded.

  Next, the effect | action of this form by such a structure is demonstrated. When the viewer A sitting on the seat 14 set at the substantially center of the screen 2 views the image, first, the panorama image recorded in the image storage means by driving the video player 16 or the personal computer 17. Play. Then, the reproduced image signal is transmitted to the projector 3 via the communication line 18 such as the indoor LAN.

  The projector 3 generates an image based on the received image signal, and emits the image through the projection lens member 3a. The projection light emitted from the projection lens member 3a is reflected by the convex mirror 11 and emitted in all directions.

  The image emitted from the convex mirror 11 in all directions is projected onto the projection surface 2c formed on the inner surface of the screen 2 (and the door 6), and a panoramic image is projected onto the projection surface 2c.

  Thus, in this embodiment, an image is picked up using a convex mirror having the same reflecting surface as the convex mirror 11 used when projecting the image onto the projection surface 2c, and when the image is emitted from the projector 3, the image is picked up. Since the projection light is reflected by the convex mirror 11 having the same reflective surface as that used and projected onto the projection surface 2c of the screen 2, the projector 3 captures the captured image without using a special optical system. Since a panoramic image can be projected onto the projection surface 2c simply by emitting the light as it is, a panoramic image full of realism can be projected at a low cost by using the reflecting member 4 and the projector 3 that is usually commercially available. And high versatility can be obtained.

  Further, since the projector 3 and the reflection member 4 are fixed to the ceiling 5a, the projection lens member 3a is directly below the portion where the projector 3 is disposed, that is, in the horizontal direction with respect to the screen 2. Therefore, the viewer A can view the panoramic image at this position, and can further experience the panoramic image full of realism.

  Furthermore, it is not necessary to convert the captured omnidirectional image into a panoramic image one by one in the imaging device or the video player 16 or the personal computer 17, and the data processing and load required for the image conversion can be reduced accordingly. .

  By the way, the convex mirror 11 needs to set the distance L accurately with respect to the projection lens member 3a so that the projection light reflected by the convex mirror 11 is accurately projected as a panoramic image on the projection surface 2c. . In the following, the adjustment work of this distance L will be described.

  First, in a state where the projection light emitted from the projector 3 is reflected by the convex mirror 11 and a panoramic image is projected on the projection surface 2c, the convex mirror 11 is rotated right or left.

  Then, the screw shaft portion 11 a protruding from the back surface of the convex mirror 11 is screwed into the screw hole of the boss portion 8 a protruding from the seat surface 8 fixed to the ceiling 5 a of the suspension member 7. Therefore, by rotating the convex mirror 11, the convex mirror 11 moves back and forth along the screw shaft portion 11a, and the distance L of the convex mirror 11 with respect to the projection lens member 3a is varied.

  When the distance L is varied, the reflection angle of the projection light incident on the convex mirror 11 is varied, so that the projection state of the panoramic image projected on the projection surface 2c changes.

  The operator adjusts the position of the convex mirror 11 while viewing the panoramic image projected on the projection surface 2c, and stops the rotation of the convex mirror 11 at a position where an appropriate display state is obtained. Then, the set screw 12 screwed into the side surface of the boss portion 8a is screwed in, and the tip of the set screw 12 is bitten into the screw shaft portion 11a to be positioned and fixed.

  Thus, in this embodiment, since the mechanism for adjusting the distance L between the convex mirror 11 and the projection lens member 3a is provided, a panoramic image can be projected clearly on the projection surface 2c. In addition, since this adjustment mechanism is provided in the connecting portion between the reflecting member 4 and the suspension member 7, display adjustment by the projector 3 itself is not necessary for position adjustment, and simplification of the adjustment work can be realized. .

  FIG. 4 is a sectional view corresponding to FIG. 3 according to the second embodiment of the present invention. In addition, about the component same as 1st form, the same code | symbol is attached | subjected and description by drawing is abbreviate | omitted.

  In the projection system 1 according to the first embodiment described above, the reflecting member 4 is provided with one convex mirror 11 as a reflecting optical system, and the projection light emitted from the projector 3 is reflected by the convex mirror 11 to project the projection surface of the screen 2. Although the panoramic image is projected onto 2c, the reflecting member 21 according to the present embodiment includes the first and second convex mirrors 25 and 26 as the reflecting optical system 24, and the projection lens of the projector 3 is used. The projection light emitted from the member 3 a is reflected by the first convex mirror 25 and the second convex mirror 26 and then projected onto the projection surface 2 c of the screen 2, with the reflective optical system 24 and the projector 3 as the center. Peripheral devices to be integrated in a compact manner.

  That is, the projector 3 is attached to the ceiling 5a with the projection lens member 3a oriented downward. Therefore, in this embodiment, the suspension member 7 of the first embodiment can be omitted. The reflecting member 21 has a cylindrical support member 27. The support member 27 is disposed so as to surround the projector 3, and its upper end is fixed to the ceiling 5a. Further, a second convex mirror 26 is fixed to the lower end portion of the support member 27 in a state where the reflecting surface is directed downward. Further, a first convex mirror 25 is provided below the second convex mirror 26 in a state where the reflecting surface is directed upward, and the first convex mirror 25 is fixed to the transparent cover 28. The transparent cover 28 is formed in a hemispherical shape, and its opening end is fixed to the support member 27.

  Similar to the first embodiment, the reflecting surfaces of the both convex mirrors 25 and 26 are formed by rotating hyperboloids with the optical axis as the center, or conical surfaces. The optical axes of the projection lens member 3a and the convex mirrors 25 and 26 are coincident with each other, and an axial hole 25a for allowing the projection lens member 3a to face is formed at the optical axis center of the second convex mirror 26. Yes.

  In such a configuration, the projection light emitted downward from the projection lens member 3 a of the projector 3 is projected while spreading on the second convex mirror 26 provided on the reflection surface of the first convex mirror 25. Then, the projection light projected on the second convex mirror 26 is reflected on the reflection surface of the second convex mirror 26 while spreading again and projected onto the projection surface 2c of the screen 2, and is projected onto the projection surface 2c. A panoramic image is projected.

  Since the projection light from the projection lens member 3a is reflected by the first and second convex mirrors 25 and 26 and projected onto the projection surface 2c, the first convex mirror 25 and the projector 3 are connected to each other according to the first embodiment. The distance between the convex mirror 11 and the projector 3 can be made closer. As a result, the reflecting optical system 24 and the projector 3 can be integrated in a compact manner, and can be easily attached to the ceiling 5a or the like with a small protrusion amount.

  Note that the image projected from the projector 3 is an image captured using a reflecting member having the same configuration as that of the second convex mirror 26 and the first convex mirror 25 constituting the reflective optical system 24, and is projected. Need not be 360 °, as long as the viewing range (about 200 to 240 °) when the viewer A sitting on the seat 14 swings his head left and right is covered, as in the first embodiment. Good.

  As described above, in this embodiment, since the projection light from the projector 3 is reflected by the first and second reflecting mirrors 25 and 26 to project the panoramic image on the projection surface 2c of the screen 2, the projector 3 Can be fixed on the ceiling 5a side, the mounting structure of the projector 3 can be simplified.

  Also, in the figure, the mechanism for adjusting the distance between the second convex mirror 26 and the projection lens member 3a is not clearly shown, but the support member 27 is composed of an inner cylinder and an outer cylinder, and one of them is provided on the ceiling 5a. The second convex mirror 26 and the transparent cover 28 are fixed on the other side, and the inner cylinder and the outer cylinder are screwed together to easily adjust the distance by the screwing amount of the screwed portion. be able to.

FIG. 5 is a schematic perspective view of a projection system according to the third embodiment of the present invention. In the projection system 31 according to this embodiment, a cylindrical transmissive screen 34 is used, and an image projected on the transmissive screen 34 is observed from the outside. Note that the configuration and support structure of the projector 3 and the reflecting member 4 are the same as those in the first embodiment, and thus the description thereof will be omitted. So that the cylindrical transmissive screen 34 is placed between the lower cylindrical member 32 fixed to the floor and the upper cylindrical member 33 fixed to the ceiling. By disposing the projector 3 and the reflecting member 4 having the same configuration as the first embodiment on the ceiling 5a side of the central axis, a display in an exhibition hall or an information display in a public facility or the like Can function as. In this case, an image may be projected on the transmission screen 34 using the projector 3 and the reflection optical system 24 according to the second embodiment.

  The present invention is not limited to the above-described embodiments. For example, the image projected on the projection surface 2c is not limited to the real image captured by the imaging device, but may be a CG created by a computer. Also, the installation location may be a structure in which the reflecting member 4 (or 21) and the projector 3 are arranged on the floor surface.

  The projection system according to the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

Sectional side view which shows roughly the structure of the projection system by 1st form II-II sectional view of Fig. 1 1 is an enlarged cross-sectional view of the main part of FIG. Sectional drawing equivalent to FIG. 3 by 2nd form Schematic perspective view of a projection system according to the third embodiment

Explanation of symbols

   DESCRIPTION OF SYMBOLS 1,31 ... Projection system, 2 ... Screen, 2c ... Projection surface, 3 ... Projector, 3a ... Projection lens member, 4,21 ... Reflection member, 5a ... Ceiling, 7 ... Hanging member, 11 ... Convex mirror, 12 ... Stop Screws, 24: reflective optical system, 25: first convex mirror, 26: second convex mirror, 27: support member, 34: transmission screen, A: viewer, L: distance

Claims (4)

A screen formed in a cylindrical shape;
A projector having a projection lens member that projects projection light in a direction along the central axis of the screen;
A projection system including a reflection member disposed in a projection direction of the projector and having a reflection optical system that reflects a projection light from the projection lens member and projects a panoramic image on the screen;
The projector is disposed on one side in a direction along the central axis of the screen;
The projection optical system provided on the reflection member is formed in a convex shape, and the reflection optical system is disposed in a state where the optical axis of the projection lens member is aligned. system. The projection system according to claim 1, wherein the reflecting member is provided with an adjusting mechanism for adjusting a distance between the reflecting optical system and the projection lens member. The projection system according to claim 1, wherein the reflection optical system is a convex mirror that faces the projection lens member. The reflective optical system is disposed opposite to the projection lens member to reflect the projection light from the projection lens member, and reflects the reflected light from the first convex mirror to reflect the panorama on the screen. The projection system according to claim 1, further comprising a second convex mirror that projects an image.

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