Electrochromic diaphragm device

Details Electrochromic diaphragm device Electrochromic diaphragm device

1994-03-14

1995-11-28

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359269, 354226, 3542271, G02F 1153

Patent

active

054713390

ABSTRACT:
A small-sized diaphragm device for an image pickup lens system having an electrochromic element the light transmitting properties of which are changed on application of an electrical voltage. The diaphragm device also includes a first set of plural concentrically arranged transparent electrodes, a second set of plural concentrically arranged transparent electrodes and third electrodes formed on the outermost peripheries of these sets of transparent electrodes for acting as counter-electrodes for the transparent electrodes. The diaphragm device has a sufficient light transmittance when in the transparent state, while having high light interrupting properties when in the light interrupting state.

REFERENCES:
patent: 4147416 (1979-04-01), Shimizu
patent: 4167308 (1979-09-01), Barclay et al.
patent: 4218120 (1980-08-01), Kawamura et al.
patent: 4480269 (1984-10-01), Yoshida et al.
patent: 5073011 (1991-12-01), Ito et al.
EPO Search report.

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