Hydraulic automatic light control

Details Hydraulic automatic light control Hydraulic automatic light control

1982-06-24

1985-01-29

Corbin, John K.

350449, 350312, G05D 2500

Patent

active

044962185

ABSTRACT:
An improved, controlled automatic light control device is provided by the e of a hydraulic automatic light control. Hydraulic control avoids inherent problems of mechanical automatic light control devices. A liquid used for light absorption permits the entire iris area to darken without loss of aperture. The uniform extinction without diffraction limitations of mechanically driven automatic light control devices is significantly improved. The use of thermoelectric coolers and heat sinks provides reliability in a large dynamic range environment without warping or other distortion of the system. The device is applicable for visible light to near infrared light.

REFERENCES:
patent: 612937 (1898-10-01), Uebelacker
patent: 1234333 (1917-07-01), Heathcote
patent: 2481660 (1949-09-01), Harrison
patent: 2537011 (1951-01-01), Aparicio
patent: 3560077 (1971-02-01), Sooy et al.
patent: 3572907 (1971-03-01), Cindrich
patent: 3695681 (1972-10-01), Dockery
patent: 3990786 (1976-11-01), Jorna et al.
patent: 4065207 (1977-12-01), Zavitsanos et al.

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