ASSIST LIGHT PROJECTION APPARATUS, FLASH APPARATUS, AND PHOTOGRAPHING APPARATUS

摘要

The present invention relates to a technology for improving a robust property for the change of a focus distance in a pattern for detecting an auto focus. A fill light projection unit (32)(fill light projection apparatus) projects a pattern (P) for detecting the auto focus as fill light to enable a focus detection unit (16) to detect the auto focus by being mounted in a camera (10)(photographing apparatus) including the focus detection unit (16)(auto focus detection apparatus). The pattern (P) for detecting the auto focus includes a densified pattern area (Pc) which is more densified between a jo-pattern area (Pr) and a pattern area (Pm) more densified than the jo-pattern area (Pr). The centric coordinate (prc) of the jo-pattern area (Pr), the centric coordinate (pmc) of the pattern area (Pm), and the centric coordinate (pcc) of the densified pattern area (Pc) are separated from each other by considering time difference between the photographing lens (20)(photographing optical system) of a camera (10) and the projection system of the fill light projection unit (32) in the pattern (P) for detecting the auto focus.