Dynamic beam flattening apparatus for radiation therapy

Details Dynamic beam flattening apparatus for radiation therapy Dynamic beam flattening apparatus for radiation therapy

1995-08-11

1997-04-29

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Absorption

378113, A61N 510

Patent

active

056256639

ABSTRACT:
The note path of a banknote validator has a U-shaped transverse cross section. A transverse strip of the note path is illuminated by light from a light transmitting station by means of a unitary light guide which has an arcuate portion conforming to the transverse cross section of the note path. Light reflected from a banknote within the note path, is captured by the light guide and guided to a light receiving station. The light guide is shaded such that a transverse strip of the note path is substantially evenly illuminated. The U-shape of the note path also assists the insertion of notes into the validator, as an inserted note is used to bow during insertion thereby increasing its rigidity.

REFERENCES:
patent: 4868843 (1989-09-01), Nunan
patent: 5153900 (1992-10-01), Nomikos et al.
patent: 5216255 (1993-06-01), Weldlich

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