| 摘要 |
Featured is a portable planetarium device suitable for use in projecting cle ar bright images of stars, planets, and other celestial objects onto a curved viewing surface. The portable planetarium devices of the invention comprise a point light source generator (56), a light dispersing lens assembly (110), a nd an opaque enclosure (120) having transparent domains surrounding the light dispersing lens assembly. Also featured is a portable point light source comprising a light source (56) , a light collection element (58) and a light conducting conduit (80) suitable for use in providing high intensity light with a small cross-sectional area.
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