| 摘要 |
PURPOSE:To obtain an excellent picture reading output by eliminating switching noise and an offset voltage of a switching element for signal read. CONSTITUTION:The switching noise is prevented from appearing at the read output by providing preamplifiers A1-An to the pre-stages of the switching elements S11-Sin to read signals from photoelectric converting elements D1-Dn. Moreover, picture reading signals are obtained by detecting output signal differences among the preamplifiers A1-An before and after an input terminal potentials of the preamplifiers are reset. |
