초록 ▼

An automatic focusing apparatus for a camera for performing focus detection on the basis of image signals accumulated by an accumulation type sensor unit. At the time of image signal reading, the sensor signals are amplified with different gains in a continuous photographing state and in a single-sh

An automatic focusing apparatus for a camera for performing focus detection on the basis of image signals accumulated by an accumulation type sensor unit. At the time of image signal reading, the sensor signals are amplified with different gains in a continuous photographing state and in a single-shot state, thereby improving continuous photographing characteristics.

대표청구항 ▼

An automatic focusing apparatus for a camera having a single-shot state for performing photographing every operation of a release operation member and a continuous photographing state for performing a next photographing operation after an end of a previous photographing operation, comprising: a focu

An automatic focusing apparatus for a camera having a single-shot state for performing photographing every operation of a release operation member and a continuous photographing state for performing a next photographing operation after an end of a previous photographing operation, comprising: a focus detection circuit, operative prior to a photographing operation, for detecting a focus state, said focus detection circuit including (a) an accumulation type sensor unit for receiving incident light and accumulating signals corresponding to states of received light, and (b) a calculating circuit for performing arithmetic calculation of a focus state on the basis of the signals accumulated in said sensor unit; a driver adapted for driving a focusing optical system in accordance with the focus state calculated by said calculating means; said focus detection circuit being further provided with an amplifier for amplifying the signals accumulated by said sensor unit and transmitting the amplified accumulated signals to said calculating circuit; and a selector for switching a gain of said amplifier between the single-shot state and the continuous photographing state, said selector setting the gain of said amplifier higher in the continuous photographing state than in the single-shot state.