Mechanism for detecting a rotation amount of a diaphragm for use

Details Mechanism for detecting a rotation amount of a diaphragm for use Mechanism for detecting a rotation amount of a diaphragm for use

1991-10-04

1994-12-06

Sugarman, Scott J.

Optical: systems and elements

Lens

With light limiting or controlling means

359694, 359697, 318254, 3542711, G02B 908, G02B 1514, G02B 902

Patent

active

053716337

ABSTRACT:
A magnetic element is provided on the outer periphery of a ring member which is operatively connected with diaphragm blades. This magnetic element is either shaped or constructed so that it exhibits a magnetic gradient (viz., produces non-uniform magnetic leakage flux properties). A Hall sensor is mounted stationarily with respect to the ring member so as to respond to the change in magnetic leakage flux and indicate the amount of rotation of the ring.

REFERENCES:
patent: 4086519 (1978-04-01), Persson
patent: 4740064 (1988-04-01), Kao et al.
patent: 4860040 (1989-08-01), Tamamura et al.
patent: 4874233 (1989-10-01), Yamamoto et al.
patent: 4922274 (1990-05-01), Yamamoto et al.
Patent Abstracts of Japan, vol. 6, No. 34, Mar. 2, 1982.
Patent Abstracts of Japan, vol. 6, No. 125 Jul. 10, 1982.

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