Optical device and photographic unit
AssigneeFuji Photo Film Co., Ltd.
InventorsHideki Kaneiwa, Ryuji Shinohara, Atsushi Matsunaga, Yoshio Ishii
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Abstract
An optical device comprises; an electromotive force generating element that generates an electromotive force; and an electrochromic element to be driven by the electromotive force, wherein at the time when the optical device is turned on and an optical density of the electrochromic element becomes constant, a consumed electric current is not more than (power source voltage (V))/5 mA; and a potential between both poles of the electrochromic element 10 seconds after switching the optical device from an ON state to an OFF state is not more than 50% on the basis of a potential between the both poles of the . electrochromic element just before switching.
Claims32
An optical device comprising:
- an electromotive force generating element that generates an electromotive force;
- and
- an electrochromic element to be driven by the electromotive force,
- wherein at the time when the optical device is turned on and an optical density of the electrochromic element becomes constant, a consumed electric current is not more than (power source voltage (V))/5 mA;
- and a potential between both poles of the electrochromic element 10 seconds after switching the optical device from an ON state to an OFF state is not more than 50% on the basis of a potential between the both poles of the electrochromic element just before switching.
An optical device comprising:
- an electromotive force generating element that generates an electromotive force;
- an electrochromic element to be driven by the electromotive force;
- and
- at least one or more resistors as connected in parallel to the electrochromic element,
- wherein the optical device has a function to adjust a quantity of an electric current which flows thtrough at least one of the resistors depending upon an (ON/OFF) state of the optical device.
An optical device comprising:
- an electromotive force generating element that generates an electromotive force;
- an electrochromic element to be driven by the electromotive force;
- and
- one or more resistors connected in parallel to the electrochromic element,
- wherein the optical device has a function to adjust a quantity of an electric current which flows through at least one of the resistors so as to have a timing at which in said at least one resistor after switching the optical device from an ON state to an OFF state, a larger quantity of an electric current flows in comparison with a value of an amount of the flowing electric current just before switching.
Dependencies are inferred from the claim text.