Method for automatically controlling the length of...

Details Method for automatically controlling the length of... Method for automatically controlling the length of...

2005-07-26

2005-07-26

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

C359S461000

Reexamination Certificate

active

06922284

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.

REFERENCES:
patent: 5121977 (1992-06-01), Weisgerber
patent: 5548356 (1996-08-01), Portman
patent: 5737123 (1998-04-01), Donohoe
patent: 6462868 (2002-10-01), Giesberg et al.
patent: 6507435 (2003-01-01), Bergman

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