Patent ID: 7378632

Claim:
An image display apparatus, comprising: a light source for emitting a modulated light beam based on image information; a conversion optical system for converting the light beam from the light source into a convergent light beam; a scanning member for two-dimensionally scanning the light beam from the conversion optical system; a scanning optical system for imaging the light beam scanned by the scanning member onto a surface to be scanned; and an ocular optical system for observing a two-dimensional image formed on the surface to be scanned, wherein the scanning optical system includes a reflective surface which is rotationally asymmetric shape, wherein the reflective surface of the scanning optical system is a curved surface and has a positive power in a position in which a center light beam is incident on the reflective surface; and wherein when a radius of local curvature within a vertical section at an intersection closest to the scanning member, of respective intersections between the reflective surface of the scanning optical system and principal rays of respective scanning light beams within the vertical section including a principal ray of the center light beam and a vertical direction, is expressed by Rn, a radius of local curvature within the vertical section at an intersection farthest from the scanning member, of the respective intersections, is expressed by Rf, and a curvature radius ratio φ is expressed by φ= Rf/Rn, a condition 1<φ<2 is satisfied.