Iris diaphragm actuator, magnetic position sensing structure...

Details Iris diaphragm actuator, magnetic position sensing structure... Iris diaphragm actuator, magnetic position sensing structure...

2006-07-25

2010-02-23

Blackman, Rochelle-Ann J (Department: 2862)

Photography

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Diaphragm

C396S457000, C396S458000, C359S739000, C318S400380

Reexamination Certificate

active

07665914

ABSTRACT:
An iris diaphragm actuator includes a magnetic position sensing structure, at least one driving element and a light intercepting element. The magnetic position sensing structure includes a magnetic element and a magnetic sensor relatively disposed. The driving element connects and drives the magnetic element or the magnetic sensor to perform a rotating motion with respect to a rotation center such that the distance and angle between the magnetic element and the magnetic sensor are changed so as to obtain a substantially linear relation between a magnetic flux sensed by the magnetic sensor and the position of the magnetic element. Also, an arrangement method of a magnetic position sensing structure is disclosed.

REFERENCES:
patent: 5258874 (1993-11-01), Bajat et al.
patent: 2005/0001570 (2005-01-01), Lee et al.

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