Line image sensor with controlled photosensitivity

摘要

A photoelectric transfer element of which a reading sensor for reading written materials such as facsimile documents has a controlled photosensitive region within the photoelectric transfer element. Thus photosensitivity in a region of the photoelectric transfer element is reduced to improve element performance. The specific photosensitivity control methods include an electric field control, increased impurity concentration, and irradiation ultraviolet light.