Patent ID: 7403329

Claim:
An electronic imaging apparatus comprising: an optical system comprising an optical component, the optical component comprising: a first optical element having at least one surface with a refractive power or at least having one plane surface and two transmitting surfaces; chemical substance, light transmittance of which is changeable by chemical change according to electric quantity; and a second optical element having a transmitting surface or a reflecting surface; and an electronic imaging element for converting an object image obtained through the optical system into an electric signal, wherein the optical component is constructed and arranged so that the chemical substance is sandwiched between one of optical surfaces of the first optical element and one of optical surfaces of the second optical element, and wherein the optical system and the electronic imaging element satisfy the following condition: F>a ( a≦ 3.5/μm) where F is a fully opened F value of the optical system under a condition where a focal length is in a shortest state, and reference symbol a represents a pixel pitch in micrometer of the electronic imaging element in a horizontal or vertical direction of the electronic imaging element.