Solid-state image pickup device

Abstract

Abstract PURPOSE:To execute a smoother exposure control by calculating the charge discharging timing of a CCD for each step and expanding or shortening a photoelectric converting period in a definite ratio for each one step. CONSTITUTION:In a timing control circuit 50, when an expanding signal OPEN in the photoelectric converting period of a CCD 10 is inputted from a decoder 35 of a deciding circuit 30, an arithmetic circuit 53 adds both data, and SX+SX/n is outputted as next step data SX+1. When a shortening signal CLOSE is inputted, divided data SX/n is subtracted from data SX, and SX-SX/n is outputted as the next data SX+1. The output of the circuit 53 is compared with the output of a step counter 54 by a comparing circuit 55 and, simultaneously, stored into a data holding circuit 51 again. Consequently, the data compared with the output of the counter 54 by the circuit 55 are changed by 1/n in one step, and the photoelectric converting period is change by 1/n period in one step according to the data SX+1.

Inventors

• 👤 Yoshihito Higashitsutsumi
• 👤 良仁 東堤
• 👤 Yukihiro Yamada
• 👤 幸宏 山田

Bibliographic Details