JP3130127U - Video projector adapter for dome - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video projector adapter for a dome capable of diverting a commercially available video projector to an apparatus for projecting onto a dome surface using a fisheye lens.
A main body 6 capable of fixing an existing video projector 7, an intermediate adapter lens 9 for correcting a light beam emitted from a projection lens 8 of the video projector to an appropriate angle of view, and a light beam from the intermediate adapter lens The fisheye adapter lens 11 that projects the entire angle of view and projects the entire dome screen to form an adapter.
[Selection] Figure 2

Description

  The present invention relates to a device for projecting astronomical images such as a planetarium, academic images, and entertainment images on a dome screen, and more particularly to a device for projecting images from a video projector onto a dome surface using a fisheye lens. .

  Conventionally, when projecting to the entire dome screen with a video projector (hereinafter simply referred to as “projector”), a split projection method in which the projection is divided by a plurality of projectors and a fish-eye projection lens by modifying a commercially available video projector. A monocular projection method for projecting with a fish-eye projector for a dome equipped with is known. In the latter case, the installation position in the dome is arbitrary, and the entire image of the dome screen can be covered with a single projector.

JP 2001-309275 A Japanese Patent Laid-Open No. 9-149351

  Of these, the split projection method is mainly used for large dome, but the cost of the projector and image sending device is high, and it is difficult to adjust the image and maintain the quality such as edge blending, illuminance balance, and color balance. there were.

  On the other hand, the monocular projection method mainly used for small dome can greatly reduce the cost of the device and the labor of image adjustment compared with the division method, but it is suitable for the optical system in selecting a commercially available projector. Since it was necessary to design a fisheye projection lens and to modify the projector, it was difficult to change the model once it was commercialized. Contrary to this, since commercial projectors become more sophisticated and cheaper year by year, we want to give freedom to the selection range and use the best one in a timely manner, but the existing fish-eye projection lens matches the projector we want to select. In most cases, there are no cases, and as described above, it is necessary to design a fish-eye projection lens that is compatible with the optical system.

  On the other hand, in the video production for the sky dome, video contents that depend on computer graphics accounted for the majority, requiring expensive production costs and complicated systems. In the facility of a small dome, there are facilities and economical limits to use such content, and a simple method for producing video content has been demanded.

  This device was created to solve the above-mentioned problems of the prior art and provides a video projector adapter for a dome that can be used to convert a commercially available video projector into a device for projecting onto a dome surface using a fisheye lens. The purpose is to do.

  That is, the dome video projector adapter of the present invention is a main body that can fix an existing video projector, an intermediate adapter lens that corrects a light beam emitted from the projection lens of the video projector to an appropriate angle of view, and the intermediate adapter lens. It consists of a fisheye adapter lens that expands the angle of view of the luminous flux from the dome screen and projects it onto the entire dome screen.

  In this device, a fisheye adapter lens is used to expand the luminous flux after being irradiated from a projection lens of a commercially available projector to the entire dome screen. This lens has an aperture that can capture the light beam obtained by cutting the image element of the projector into a circular shape or a necessary shape with a margin on the incident side, and the field angle range of the projection lens is as close to 180 ° as possible. Has the effect of enlarging conversion. As long as the aperture and the conversion angle of view satisfy the conditions, a commercially available fisheye conversion lens for photographing may be used instead.

  However, the projection angle of a commercially available projector differs in the specifications of each company as shown in FIG. 7, for example. In order to use this fisheye adapter lens in many projectors, in this device, an intermediate adapter lens is provided between the projection lens and the fisheye adapter lens, and the angle of view adjustment and distortion and aberration correction functions are provided. .

  In order to change the installation position on the dome screen, if a commercially available projector has a zoom function, it can be adjusted to an appropriate angle of view using that. In order to provide more flexibility, it is also effective to give the intermediate adapter lens a slight zoom function that can absorb the difference in angle of view of each company.

  In many projectors on the market, the projection lens has a fixed shift, and when the image is cut out in a circle and projected onto the whole dome screen, the circular edge does not overlap the parting line of the dome screen, so it is visually distorted. I can see it. In order to solve this problem, there is a method of using a digital keystone correction function of the projector or performing distortion correction by digital processing of the image transmission apparatus. Further, as an optical processing method, the intermediate adapter lens can have a distortion correction function. However, since a high-performance model has an electric shift function or a manual shift function, the optical axis of the projection lens can be set at the center of the image, so there is no need for distortion correction.

  Assuming that this projector is used on a planetarium, etc., when projecting Hoshino with a planetarium, I would like to reproduce the beautiful starry sky by making the screen of this projector black, but most commercial projectors have a slight stray light even on a black screen It is a well-known phenomenon that it does not become a true black screen because it emits, and the contrast of the starry sky is significantly hindered. In order to solve this problem, an aperture / shutter mechanism can be incorporated in the intermediate adapter lens or it can be provided outside.

  In addition, the fisheye adapter lens may be detachable. When the lens is removed, the fisheye adapter lens can be used as a video projector with a general angle of view, and can be used for ordinary presentations in the facility.

  In addition, when the removed fisheye adapter lens is attached to a digital camera or digital video camera, it can also be used to shoot still images and movies on the whole sky, and the image produced in this way is projected to the whole sky It can be used as an image with very little distortion.

  According to the adapter of the present invention having the above configuration, a projector having an optimum specification can be used by combining an intermediate adapter lens and a fisheye adapter lens after being set on the adapter without modifying a commercially available projector. A monocular projection dome fisheye projector is realized.

  Therefore, according to this device, it eliminates the disadvantage of being difficult to accommodate model changes like the conventional monocular projection dome fisheye projector, flexibly responds to technological innovations of commercially available video projectors, and has high performance. It has become possible to provide a low-cost dome fish-eye projector. This is particularly effective for realizing a fisheye projector for a dome using a small DLP or liquid crystal projector.

  In addition, if the fisheye adapter lens of the adapter of the present invention is used for shooting, it is possible to produce all-sky dome video content easily and inexpensively, providing a consistent process from video production to projection at a low cost. be able to.

    Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. Here, an example is given of a case where a whole-sky image is projected by a fisheye projector for a dome using the adapter of the present invention in a planetarium facility using an electronic image.

  FIG. 1 is a diagram showing an outline of the planetarium facility. This planetarium facility comprises a dome screen 1 and a dome fish-eye projector 2 installed in the center below the screen.

  FIG. 2 is a diagram showing details of a fish-eye projector for a dome using the adapter of the present invention. Reference numeral 6 in the figure denotes a main body of the adapter, and here, it is configured in a casing shape for fixing and accommodating a commercially available (existing) projector 7 therein. The luminous flux emitted from the projection lens 8 of the projector 7 is corrected to an appropriate angle of view by the intermediate adapter lens 9, and then the angle of view is enlarged by the fish-eye adapter lens 11. As shown in FIG. Projected to the whole sky. In the figure, reference numeral 15 is an auxiliary leg for raising the main body with respect to the floor surface, and 16 is a cooling fan.

  The intermediate adapter lens 9 and the fisheye adapter lens 11 are attached to an inclined lens mount 10 that is rotatably attached to a shaft 17 that coincides with the principal point of the projector 7. Therefore, the shift angle 12 of the adapter lens group can be adjusted to the optimum angle according to the lens shift specification of the projector 7.

  Although not shown in particular, the fish-eye adapter lens 11 and the intermediate adapter lens 9 may be independently rotatable about the shaft 17, and in this case, it is effective for averaging the upper and lower aberrations caused by the shift angle 12. It becomes a means.

  If the projector 7 is not a fixed lens shift system but an electric lens shift system in which the projection lens 8 is aligned with the projector optical axis 13, the shift angle 12 is 0 °, and the fisheye adapter lens. 11 and the optical axis of the intermediate adapter lens 9 coincide with the projector optical axis 13.

  By the way, if the intermediate adapter lens 11 is provided with a zoom function, the angle of view can be adjusted even when the projection lens 8 of the projector 7 has a fixed focus specification, so that an appropriate image range can be set according to the installation conditions of the screen.

  Further, if the intermediate adapter lens 11 has an anamorphic function, the magnification of the image in the horizontal direction and the vertical direction can be made different on the image plane, and the vertical and horizontal sizes of the image area of the projector 7 can be fully used. The horizontal resolution can be improved and the illuminance of the entire screen can be improved.

  Further, an aperture / shutter mechanism may be attached near the intermediate adapter lens 11 of the tilt lens mount 10. In this case, as described above, a true black screen can be obtained by blocking stray light on the black screen.

  The fisheye adapter lens 11 may be detachable from the adapter. When this lens is removed, a normal screen can be projected for presentation with the remaining configuration. In this case, the video image 4 may be projected on the zenith as shown in FIG. 1 with the adapter body 6 standing on the floor, or the leg 15 is removed and the adapter body 6 is horizontally placed at an arbitrary position on the dome as shown in FIG. You may use it.

  In planetarium facilities, there are cases where the dome parting line is inclined, or in amusement facilities, etc. When installing in the dome of such a form, it respond | corresponds by the shape change of the leg 15, and the change of the attachment position to the main body 6. FIG. If the projector is small, it is also easy to use by attaching it to a camera tripod and adjusting the projection direction freely.

  When the fisheye adapter lens 11 is removed from the adapter, it may be used as a conversion lens of a camera for photographing. FIG. 4 schematically shows a method for photographing the whole sky using the fish-eye adapter lens 11, and the digital camera 17 is connected with the connection adapter 18 and the digital video camera 19 is combined with the connection adapter 20. To do.

  As shown in FIG. 5, a PC 5 for normal image transmission is connected to the fisheye projector 2 for dome, and application software such as digital planetarium, presentation, still image reproduction, and video reproduction is started to perform effects such as planetarium. .

  In addition, the all-sky moving image captured by the digital video camera 19 is connected to the dome screen using the video camera playback function by connecting the video camera and the dome fisheye projector 2 with a video signal cable. Project.

  FIG. 6 is a view showing another embodiment of the adapter of the present invention. In this embodiment, the video projector 7 is fixed to the main body 6 in a horizontal state, the light beam emitted from the projection lens of the video projector is reflected, and directed upward toward the intermediate adapter lens 9 and the fisheye adapter lens 11. It is emitted. Here, the mirror 21 is employed as the reflecting means, and this mirror, the adapter lens 9 and the fisheye adapter lens 11 are attached to the mirror mount 22. According to this embodiment, since the projector 7 can be installed horizontally in the case of all-sky projection as well as a general usage, it is possible to reduce a burden such as heat applied to the projector.

The side view which shows the usage example of the fisheye projector for dome which implemented the video projector adapter for dome of this invention. The partially cutaway side view of the fisheye projector for dome which implemented the video projector adapter for dome of this invention. FIG. The side view which shows the example which uses a fisheye adapter lens as a conversion lens of the camera for imaging | photography same as the above. The side view which shows the example of a connection with other apparatuses same as the above. The partially cut away side view of the fisheye projector for dome which implemented the video projector adapter for dome of the Example from which this invention differs. The table | surface which shows the comparison of the angle of view of the existing projector.

Explanation of symbols

6 Adapter body 7 Projector 8 Projection lens 9 Intermediate adapter lens 11 Fisheye adapter lens

Claims (9)

A main body that can fix an existing video projector, an intermediate adapter lens that corrects the luminous flux emitted from the projection lens of the video projector to an appropriate angle of view, and the dome by expanding the angle of view of the luminous flux from the intermediate adapter lens Video projector adapter for dome, which consists of a fisheye adapter lens that projects on the entire screen. Means for fixing the video projector to the main body with the projection direction facing upward, a tilt lens mount that is rotatably mounted on an axis that coincides with the main point of the video projector, an intermediate adapter lens and a fisheye mounted on the tilt lens mount The dome video projector adapter according to claim 1, further comprising an adapter lens. 2. A means for fixing the video projector to the main body with the projection direction facing upward, and an intermediate adapter lens and a fish-eye adapter lens that are each independently rotatably mounted on an axis coinciding with the principal point of the video projector. Video projector adapter for dome. A means for fixing the video projector to the main body in a horizontal state and a reflecting means for reflecting the light beam emitted from the projection lens of the video projector and emitting it toward the intermediate adapter lens and the fisheye adapter lens arranged upward. Item 1. A video projector adapter for a dome according to item 1. The dome video projector adapter according to any one of claims 1 to 4, wherein the intermediate adapter lens has a zoom function. 6. The dome video projector adapter according to claim 1, wherein the intermediate adapter lens has an anamorphic function. The dome video projector adapter according to claim 1, wherein the intermediate adapter lens has a function of correcting image distortion. 8. The dome video projector adapter according to claim 1, wherein the intermediate adapter lens is provided with a diaphragm mechanism and a shutter mechanism. The dome video projector adapter according to any one of claims 1 to 8, wherein the fisheye adapter lens is detachable.

Images