Image reading apparatus
AssigneeMinolta Camera Kabushiki Kaisha
InventorsAtsuyuki Tanaka, Hiroaki Kojima, Shozo Kaieda, Tokuzi Kakiuchi, Nobuaki Nishioka, Yukio Tadauchi, Hidekazu Nakagami
Life of this patent
Estimating the term…
Abstract
An improved image reading apparatus which is so arranged that, by providing marks shaded to a predetermined density or darkness for setting a required reading area on an image reading surface, the start mark and end mark are detected by a solid state image sensor for supplying image signals within the required reading range into memory unit based on results of the on detection so as to reduce the memory capacity of the memory unit.
Claims6
An image reading apparatus which is arranged to project an image of an original onto a solid state image sensor in which a large number of photoelectric conversion elements are disposed, and to successively read out from respective photoelectric conversion elements, electrical signals corresponding to an amount of light which is received and for providing output signals into binary form corresponding to said electrical signals so as to be stored, said image reading apparatus comprising;
- a means for illuminating the surface of said original which is supported on a plate by emitting light;
- a marking member movably provided for displacement in a sub-scanning direction along the surface of said plate, said marking member being disposed in a position to be illuminated by said illuminating means and projectable onto said solid state image sensor;
- a means for judging said marking member as being projected onto said solid state image sensor, when a particular combination of signals is read out during a reading out of a signal corresponding to a light pattern projected onto said solid state image sensor;
- a means for starting the storing of said output of said image sensor as image data upon judgement of said marking;
- and
- a means for controlling an amount of light, said means emitting a signal for controlling said amount of light emitted by said illuminating means by reading a value corresponding to a analog output produced due to the projection of said marking member onto said image sensor when said marking member is judged.
Dependencies are inferred from the claim text.