| 摘要 |
PROBLEM TO BE SOLVED: To make a device compact in comparison with a device constituted so that a single rectangular infrared cut-off filter is arranged. SOLUTION: This device is constituted so that a focus can be detected in plural focus detection areas in a photographic picture frame by combining plural secondary image forming phase difference system focus detection optical systems forming the image of an object image obtained by a photographing lens L again on a pair of line sensors CS by using a pair of secondary image forming lenses L2 besides and detecting the focusing state of the lens L based on the relative deviation of the secondary object image. Besides, this device is provided with the infrared cut-off filters L01-L04 arranged in the focus detection optical systems. By combining the plural rectangular filters L01-L04, the filter is not made to project to places P and Q where the infrared cut-off filter need not be arranged. |
