Method for automatically controlling the length of projection screen and multi-purpose apparatus thereof
US6922284B1 · kind B1 · utility
2Cited by
5References
19Claims
0Family size
Inventor
Key dates
| Filing date | Jan 26, 2004 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jan 26, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for automatically controlling the length of a projection screen and an apparatus thereof are proposed. They dispose a code stripe on at least a side of the projection screen and then exploit a detector of an auto-controlled hoister to read the code stripe. The detected signal is converted into digital data for comparison with the data stored in a storage device of the auto-controlled hoister so that the auto-controlled hoister can control the length of the projection screen exactly. Hence, a multi-purpose apparatus can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.