The Infinium is the first projector as a single sphere and became the prototype of the latest generation superseding the dumbbell form. It was presented by Minolta in 1984 after an intensive redevelopment. The main innovation was the transfer of the planet projectors to an external system. This makes the positioning of the star ball easier and faster. Only one powerful bulb houses in the centre and projects up to 23,000 stars. The faintest stars are about 7.4 mag. The system enables fully automatised presentations controlled by high-performance computers. Simulations are also possible to leave the Earth-bound view and travel to other planets in the solar system. The planet images can also be zoomed in. The suspension of the ball can be lowered about a meter. After 1990, this model was further extended and is available in various flavours:

•  "Alpha": for domes from 20 - 27 m; projects ca. 26,000 stars:

•  "Beta": for domes from 17 - 20 m; projects ca. 15,000 stars;

•  "Gamma": for medium-sized domes 12 - 17 m; ca. 9200 stars.

•  "S": enhanced projection with 250,000 stars to create the Milky Way instead of using a projected artwork.