Patent ID: 6718134
Filing Date: 2004-04-06
Classification: G02B,G03B

Abstract:
An AF auxiliary light projector for an AF camera comprising a focus detection optical system having a first optical axis, and an AF auxiliary light projecting optical system having a second optical axis which intersects said first optical axis, said AF auxiliary light projecting optical system projecting an image having a predetermined contrast pattern onto a photographic object,wherein said AF auxiliary light projecting optical system comprises a projector lens, a contrast pattern chart for forming said predetermined contrast pattern, an illumination lens, and an illumination light source, in that order from an intersection between said first optical axis and said second optical axis; and wherein said illumination lens is formed having an asymmetrical optical power so that an optical power of a far distance portion of said illumination lens for a far distance region in a projection region of said contrast pattern chart is greater than an optical power of a near distance portion of said illumination lens for a near distance region in said projection region of said contrast pattern chart.