Pattern projector having a multi-portion projection lens and camera comprising the same

摘要

A compact light projection system for auto-focus detection apparatus in which a stripe pattern is projected onto an object in a wide range. The light projection device comprises a chart having a pattern to be detected, an illuminating device for illuminating the chart, and a lens assembly for projecting the pattern. The lens assembly includes a first lens having an optic axis and second and third lenses having optic axes respectively inclining at a predetermined angle to the optic axis of the first lens.