Patent ID: 7751031

Claim:
A light application apparatus comprising: an optical modulation element which has a pattern of phase steps which are provided with a first interval and different from 180 degrees, and modulates an incident light beam into a light beam forming a first light intensity distribution on a predetermined plane; and a light flux division element which changes the light beam modulated by the optical modulation element into a light beam including two divided non-interference light fluxes which are spaces in a second interval and respectively form second and third light intensity distributions on the predetermined plane; and an image formation optical system which receives the light beam from the light flux division element and image-forms a light beam on the predetermined plane, which forms a fourth light intensity distribution on the predetermined plane, the fourth light intensity distribution having an inverse peak shape and corresponding to a combination of the second and third light intensity distributions, the second interval corresponding to odd-fold of a value which is a conversion value of the first interval on an image forming plane.