Image reader incorporated in electro-developing type camera and electro-developing recording medium used therein

Abstract

An electro-developing recording medium has a reference zone exhibiting a substantially-constant transparency to prepare correction data for correcting image pixel signals obtained by an optical and electronic reading of a developed image of the electro-developing recording medium. The reference zone is located at a margin area of an image recording area of the electro-developing recording medium. Further, the reference zone is located adjacent to a side edge of the image recording area of the electro-developing recording medium. The electro-developing recording medium includes an electrostatic information recording medium and an electric charge keeping medium. The electric charge keeping medium has the reference zone exhibiting the substantially-constant transparency. The electric charge keeping medium is formed as a liquid crystal display, and the reference zone can be defined as an empty space from which a portion of a liquid crystal of the liquid crystal display has been eliminated. In the alternative, the reference zone can be defined as a plenum space which is filled with a portion of a liquid crystal of the liquid crystal display, and which is arranged such that an electric field is applied to the plenum space so as to exhibit a constant and maximum transparency.