JPS6010291A - Planetarium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical field The present invention relates to a planetarium using a projection tube.

BACKGROUND OF THE INVENTION In general, planetariums are widely used to display the relative positions of celestial bodies and images of the sky by projecting complex optical nozzles onto a hemispherical surface.

Conventional planetariums are configured to have a large number of projectors arranged in a projection section and to project constellations and the like by mechanical opening and closing operations. Therefore, this conventional device had a complicated mechanical configuration, and the optical system for such a configuration was also expensive. Furthermore, because the number of projectors is limited, they can only roughly project celestial bodies, and they also require complicated mechanical operations, requiring a specialized operator.

For this reason, in order to eliminate the above-mentioned drawbacks, Japanese Patent Laid-Open No. 56'
1079, it was proposed to project constellations and the like onto a screen inside a dome by electronically controlling a projection tube using an electron gun. However, this conventional device uses a single projection tube, and the projection tube emits a light beam toward the apex of the dome.
It covered the 0° area. For this reason, there is a drawback that the light rays are diffused and the projected image on the inner screen of the dome tends to be insufficient in light intensity. Therefore, a method can be considered in which a plurality of projection tubes using electron guns are disposed in the projection section, and an image is divided and projected for each projection tube, and the images are combined on a screen to form one screen.

In this system, a plurality of projection tubes are arranged in a spherical projection section corresponding to a screen on the inner surface of a dome having a concave hemispherical surface. In this case, it is natural that a projection tube for forming an image at the apex of the screen is disposed at the apex of the spherical projection section.

However, when the projection tube is disposed at the apex, image division becomes particularly complicated, and end faces between divided images become complicated. Therefore, many unclear image parts near the end face are likely to occur due to image distortion or the like.

By the way, if we consider celestial bodies such as constellations, it becomes clear that the apex of the celestial body is of low importance. This is because in Japan, which is in the northern hemisphere, Polaris is located around 65 degrees north latitude, and other important constellations are not located at the top of the celestial body. Therefore, the present invention has been made based on this knowledge.

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to eliminate the above-mentioned drawbacks.The present invention has been proposed in order to solve the above-mentioned drawbacks. The purpose is to provide a planetarium with a reduced image area.

The present invention includes a plurality of projection tubes for projecting images arranged in a projection section, and image signal generation means for outputting a signal for dividing the image for each of the projection tubes, so that the end face of the divided image is at the apex. It is configured to pass through.

The present invention is configured as described above, so that the amount of light of the image projected on the screen is sufficient and the operation is easy. Furthermore, image division is simple, and there are few unclear image parts due to image edges. Further, since the end face of the divided image passes through the apex, the unclear portion of the image is located at the apex of a celestial body of low importance, so there is little inconvenience. Furthermore, since the number of image divisions is small, there is no need for a monitor display device, etc., resulting in a simple configuration and low production costs.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a schematic diagram of an embodiment of the present invention. The projection unit 1 of the planetarium is a central component of the planetarium, and is for projecting images of celestial bodies and the like onto a screen 6 on the inner surface of the dome 2, and is mounted and supported on a pedestal 5 at the center of the bottom surface 4 of the dome 2. When not projecting images, a storage section provided through the center of the bottom surface 4 may be used to store the images. The projection unit 1 will be explained in more detail with reference to the plan view in FIG. 2 and the front view in FIG. 6. Four projection tubes 8 are arranged around the periphery of the spherical main body 7 at an angle of 60 degrees to 60 degrees from the apex.
8... are arranged at equal intervals.

The optical axes of the projection tubes 8, 8, . . . are arranged so as to point upward at a required angle from the horizontal direction, and are used for astrophotography.

The reason why the projection tubes 8, 8, . . . are arranged at this position of the main body 7 is to allow the end face of the divided image to pass through the apex portion of the screen 6 on the inner surface of the dome 2.

Furthermore, the projection tube 9.9... is the projection tube 8. Six lenses are arranged below the center so that their optical axes coincide with the horizontal direction. These projection tubes 9, 9, . . . are for projecting near the horizon. The numbers of throw pipes 8, 8, . . . and 9, 9, . . . are not limited to four and six, respectively.

Projection tube8. , 9, 9, . . . are constructed using cathode ray tubes and lenses, and the images divided by these projection tubes are combined to form one screen.

Next, a control circuit according to an embodiment of the present invention will be explained. Memory 10. A video tape recorder 11, a television receiver 12, a camera 13, and a film converter 14 are each connected to a program creator 15.

16 and a horizon projection section 17 .

The control section 18 controls the entire device manually or automatically, and outputs control signals to each device. The celestial body projection section 16 and the horizon projection section 17 output divided image signals to the projection tubes 8, 8, . . . and 9, 9, . Each projection tube 8, 8...
and 9, 9, . . . project the divided images onto a screen to form one composite screen. The means for dividing the screen of these electric circuit systems is jj,? : Any known means can be used instead.

The screens thus divided and projected are projected as, for example, the constellations of what month, day, and time. Furthermore, by using such a cathode ray tube, it is possible to simulate this over time, and by enlarging a part of it, and by using a computer-controlled cathode ray tube to simulate the constellations, including the Earth, as seen from the spacecraft. This is easier than in conventional mechanical shutter planetariums. When photographing the above constellations, etc., what people are most interested in are the Polaris, planets, and other stars related to direction and time, and these are concentrated in the range of 200 to 700. On the other hand, it is known that cathode ray tubes have good accuracy in the center, but the peripheral parts are blurred, but in this example, by aligning this most interesting part with the center of the projection tube, the constellations can be seen very easily. There is.

As explained above, in this embodiment, multiple projection tubes are used for projection, so the light intensity is sufficient and operation is easy.Also, since the projection tubes are not placed at the apex of the main body of the projection unit, the end surface of the image cannot be observed. Do not pass through the critical point between 20° and 70°. Therefore, the end face of the divided image passes through the apex of the celestial body of low importance, which has the advantage of reducing inconveniences caused by unclear images.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
FIG. 6 is a plan view of the main body constituting the embodiment shown, FIG. 6 is a front view thereof, and FIG. 4 is a configuration diagram of a control circuit constituting the embodiment shown in FIG. 1... Projection unit, 2... Dome, 6... Screen, 7... Main body, 8.9... Projection tube. Patent applicant: Nippon Electric Co., Ltd. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] It is characterized by comprising a projection section having a plurality of projection tubes arranged therein, and an image signal generation means for outputting a signal for dividing an image for each of the projection tubes, and an end surface of the divided image passing through an apex section. A planetarium.