The planetarium is an instrument used in the planetarium to perform artificial stars. The traditional optical planetarium can display clear and bright, vivid artificial stars and demonstrate various astronomical movements of artificial stars. However, the optical planetarium itself has a relatively simple function, and often requires a variety of special accessory instruments, video projectors, and slide projectors to perform the sky-like performances. After entering the 21st century, with the development of computer technology and video projection technology, digital zoom cameras with more flexible functions came into being. The digital planetarium is based on the principle of computer graphics. In addition to demonstrating the various movements of artificial stars and stars, it can also demonstrate lively and powerful dynamic images. Therefore, it is very easy to perform various programs by a single digital planetarium alone, so the popularity is very fast. However, limited to the performance indicators of the video projector used in the digital planetarium, the quality of the starry sky displayed by the digital planetarium is poor, and the performance of the sky-like program often requires strict quality of the starry sky. Therefore, in order to obtain a clear and bright star, the content is rich and colorful, the current solution is to use an optical + digital hybrid planetarium system.
In the prior art, a skylight is provided as a light source in a center of a projection ball, and a projection lens is uniformly disposed on an equal interval latitude of the projection ball surface, and the light emitted by the bulb is projected and projected outside the projection ball through the projection lens. When the light bulb of the planetarium is turned on, a whole image is projected through all the projection lenses, and the need to project only part or a plurality of images is not satisfied.
