Planetarium having an auxiliary projector independently rotatable about a star field projector
US4643681A · kind A · utility
4Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Apr 22, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B27/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A planetarium comprises a star field projector which projects the star field, a ring-shaped member which supports the star field projector rotatably about a first axis, a first rotating member which supports the ring-shaped member rotatably about a second axis orthogonally crossing the first axis, a support base which supports the first rotating member rotatably about a third axis orthogonally crossing the second axis, a second rotating member provided on the support base rotatable about the third axis independent of the first rotating member, and a coordinates projector provided on the second rotating member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.