Apparatus for driving dynamic aperture and method of...

Details Apparatus for driving dynamic aperture and method of... Apparatus for driving dynamic aperture and method of...

2006-02-14

2006-02-14

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S739000, C359S740000

Reexamination Certificate

active

06999245

ABSTRACT:
Disclosed herein is a dynamic aperture driving apparatus for adjusting the amount of light of a projection optical system and a method of controlling the same. The system includes a rotation means, a driving means, a first detection means and a first detection means. The rotation means is connected at the upper end thereof to the dynamic aperture to be rotated to the right and left within a range of rotating angles. The driving means rotates the rotation means to the right and left according to a predetermined electric signal. The first detection means detects the position of the rotation means using a Hall effect. The second detection means detects the operational error of the first detection means due to variation in temperature.

REFERENCES:
patent: 4434367 (1984-02-01), Yonezawa
patent: 5537166 (1996-07-01), Keelan et al.

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