JPS6058451B2 - Improvement of planetary projection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for projecting planets in a planetarium, for simulating the motions of planets and their temporal changes, and in particular for visualizing the rotations of these planets.

It is known to simulate the movement of each planet and its phase.

Conventional planetary projection devices provide an image of the planet as well as an image of the Earth that also shows various clouds.

Although these projection devices can simulate the relative motion and phase changes of each planet with respect to other stars, it is not possible to simulate the daily rotation of the Earth relative to those stars. In this text, ``planetary phase'' refers to the ratio of the area of the properly illuminated portion of the planetary surface to the total area of the planetary surface as viewed from Earth. One of the objects of the invention is to obviate the above-mentioned drawbacks.

Another object of the present invention is to simulate substantially all the motions, daily rotations, phase changes, and relative motions of a planet among many stars, with the exception of clouds on the planet's surface. It is an object of the present invention to provide a planetary projection device in which a fixed dependency relation to the planetary planet is eliminated.

Yet another object of the invention is to simulate the motion of the planet so as to give the impression of a sphere undergoing daily rotation, and to simulate the relative motion between the clouds and the planetary surface. The purpose of the present invention is to provide a planetary projection device.

These and other objectives are achieved by a planetary projection system for simulating the motion of the planets and their temporal changes, in which two cylindrical photographic mounts are provided which rotate independently of each other. be done.

The curved surface of each of the photo mounts above carries images of planets or various clouds. Ru.

Each photograph is inserted into a beam of light, and the projection rays produced by this light beam starting from each said photograph are transferred into some optical means after passing through at least one optical distortion system. It is combined with. Advantageously, the two image mounts rotate at different rotational speeds.

The image of the planet projected onto the surface of the planetarium's dome is created by moving the photo slides of the planet placed on the wall of a rotating cylinder on a circular path with the north and south poles of the same size, and by optical It appears spherical because it is equipped with a target destruction system (cylindrical optical system).

The optical distortion system described above creates an intermediate image that exhibits barrel distortion and simulates the spherical shape of the planet. In order to make the invention easier to understand, the invention will be explained in more detail below with reference to the accompanying drawings, which diagrammatically illustrate one embodiment of a planetary projection optical device according to the invention. .

The hollow cylinders 11 and 12, which are arranged for rotation about axes x-x and y-y, respectively, both have transparent curved surfaces, on which are respectively photo 1
0 and 14 are attached.

Photos (slides) 10 and 14 are images of planets and clouds, respectively.

Illumination systems 13 and 15 are connected to the hollow cylinder 1, respectively.
1 and 12, which produce respective image beams which, after passing through optical distortion systems 9 and 16 respectively, are connected to a beam splitter, i.e. semi-transparent cubic prism means 8.
are combined into one projection beam 17 by.

This combined beam 17 is bent by a reflector 7 and directed via an intermediate imaging system onto the reflector 5 of the "temporal force rod 4".

This "temporal force rod" is a hemispherical optical member that is inserted into the optical path of the image beam and serves to create the temporal position of each planet so that the light beam that produces the image of that planet is partially obscured. . The reflector 5 directs the light ray 17 through the focusing element 3, via the imaging optics 2, onto the tiltable reflector 1, which projects this ray 17 onto the dome of the planetarium. In operation, the illumination systems 13 and 15 display an image 10, for example a photographic slide of a planet's surface, and an image 1.
For example, photographic slides of various clouds are illuminated, and their images are transmitted through the distortion optics 9 and 16, respectively.
projected onto. This latter has a barrel distortion effect (
BarTelfect) so that the images are approximately spherical. Both cylinders are placed beside the distortion systems 9 and 16 about the axes x-x and y-y respectively, with only a portion of each photo slide 10 and 14 above its planetarium dome (not shown). Rotate as projected.

The semi-transparent cubic prism means 8 superimposes both images onto each other. An intermediate image of each slide 10 and 14 is produced in the plane of the reflector 5 by an intermediate imaging system 6. A force rod 4 arranged to rotate about the zz axis additionally imparts a respective time phase change to the images 10 and 14.

A reflector 1 rotatable about the u-u and v-v axes simulates the relative motion between the Earth and the moon, which must be switched off when simulating the motion of other planets. I can do it.

[Brief explanation of the drawing]

The attached figure is a diagrammatic illustration of an embodiment of a planetary projection system according to the invention. 1, 5, 7... Reflecting mirror, 2... Imaging optical system, 3... Focusing member, 4...
- Temporal force rod, 6... Intermediate imaging system, 8... Semi-transparent cubic prism means, 9, 16... Optical distortion system, 17... Ray of light.

Claims (1)

[Claims] 1. In a planetary projection system for simulating the relative motion of a planet, in particular the temporal phase change of a planet, the following illumination systems, namely a first and a second illumination system, each under optical alignment: first and second hollow cylinders having transparent curved surfaces; and a first translucent photograph representing an image of the planet;
a second translucent photograph representing an image of a cloud, with the proviso that said first and second images are affixed to said curved surfaces of said first and second cylinders, respectively; The lighting systems are the first and second lighting systems, respectively.
The first and second photos above are inside the cylinder of
and a second image beam, respectively, and first and second optical distortion systems for producing a barrel distortion of the first and second images; a semi-transparent mirror means for focusing a second image beam to produce a fused image ray; a first optical means for directing and imaging the fused image ray; a reflecting means; a planetarium dome for receiving the fused image beam from the reflecting means via the second optical means and the reflecting mirror; The above planetary projection system. 2. The planetary projection system of claim 1, wherein said first and second hollow cylinders are rotatable about first and second optical axes, respectively, coinciding with their cylinder axes. 3. The planetary projection system of claim 1, wherein said mirror is rotatable about two axes that are perpendicular to each other and substantially perpendicular to said fused image beam. 4. A planetary projection system according to any one of claims 1 to 3, wherein the first and second cylinders rotate at different speeds relative to each other.