| 摘要 |
PURPOSE:To secure autofocus operation for not only a bright object, but also even a dark object by providing an auxiliary light generating element of simple constitution to a passive type autofocusing device. CONSTITUTION:A filter 7 has the 1st filter characteristic curve part K51 through which light within a wavelength range of visibility characteristics is transmitted and the 2nd filter characteristic curve part K52 through which the light component of auxiliary light LSD is transmitted. When the bright object 3 is photographed, a light measurement signal SOUT is generated for a light receiving element 8 principally with a light component transmitted through the 1st filter characteristic curve K51, so that the distance measurement signal adapted to the visibility characteristics is obtained. When the dark object is photographed, the auxiliary light LSB is generated by an auxiliary generating element 13 and reflected light from the subject 3 is transmitted through the filter characteristic curve part K52 and incident on the light receiving element 8. At this time, no light component is transmitted through the filter characteristic curve part K51, so the light receiving element 8 obtains the distance measurement signal SOUT with the light component of the auxiliary light LSB. |
