Dual-purpose multi-media projection demonstration system used for dome screen and dome

Abstract

The invention provides a dual-purpose multi-media projection demonstration system used for a dome screen and a dome in geography class and astronomy class teaching. The system adopts the method of quickly changing lenses to realize the purpose of completely and clearly displaying demonstration pictures on the dome screen and the dome. In addition, the system has higher brightness and resolution and achieves a good display effect, and meanwhile, the transportation, installation, use and maintenance are convenient, and the cost is lower. The system comprises a dome, a dome screen, a fish-eye lens, a short-focus lens, a projector, a computer and a base, wherein a lens support device is arranged on the base and is used for fixing the fish-eye lens or the short-focus lens on the base; during the demonstration of the dome screen, the light emitted by the projector is projected to the dome screen through the fish-eye lens fixed on the base; during the demonstration of the dome, the fish-eye lens is replaced by the short-focus lens, and the light emitted by the projector is projected to the dome through the short-focus lens; and the computer is connected with the projector for controlling the projection of the projector on the dome screen or the dome.

Description

technical field [0001] The invention relates to a multimedia demonstration device, in particular to a spherical screen / dome dual-purpose multimedia projection demonstration system used for geography / astronomy teaching. Background technique [0002] At present, the multimedia dome projection demonstrator used in the teaching of geography generally only has the function of dome projection, that is, it can only be demonstrated on a spherical screen to realize projection on a spherical surface, but cannot be performed on a dome during astronomy teaching. Planetarium demonstration, and a separate digital planetarium is very bulky and needs to occupy a separate place, which is not convenient for switching during teaching. Although there are also some dual-purpose multimedia dome projection demonstrators that use the lifting method. After the dome is removed, it is raised to a position suitable for dome projection for planetarium demonstration, but the fisheye lens used for dome pr...

AI Technical Summary

Problems solved by technology

[0002] At present, the multimedia dome projection demonstrator used in the teaching of geography generally only has the function of dome projection, that is, it can only be demonstrated on a spherical screen to realize projection on a spherical surface, but cannot be performed on a dome during astronomy teaching. Demonstration of the planetarium, and a separate digital planetarium is very large and needs to occupy a separate place, which is not convenient for switching during teaching

Although there are also some dual-purpose multimedia dome projection demonstrators that use the lifting method. After the dome is removed, it is raised to a position suitable for dome projection for planetarium demonstration, but the fisheye lens used for dome projection has a large projection angle and brightness loss. It is very high, and the projection on the dome will cause a lot of waste of the display screen, and lead to the problem of low brightness and resolution of the display area. In addition, there are problems of expensive lifting platform, inconvenient transportation and installation

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