초록 ▼

A head-mounted image display apparatus capable of providing an observation image which is clear and has minimal distortion even at a wide field angle. The apparatus has an image display device (6), and an ocular optical system (7) for leading an image formed by the image display device (6) to an obs

A head-mounted image display apparatus capable of providing an observation image which is clear and has minimal distortion even at a wide field angle. The apparatus has an image display device (6), and an ocular optical system (7) for leading an image formed by the image display device (6) to an observer's eyeball position without forming an intermediate image so that the image can be observed as a virtual image. The ocular optical system (7) has at least one reflecting surface (4) having reflecting action. The at least one reflecting surface (4) has a surface configuration defined by a plane-symmetry three-dimensional surface which has no axis of rotational symmetry in the surface nor out of the surface, and which has only one plane of symmetry.

대표청구항 ▼

[ What we claim is:] [1.] A head-mounted image display apparatus comprising:an image display device; andan ocular optical system for leading an image formed by said image display device to an observer's eyeball position without forming an intermediate image so that said image is observed as a virtua

[ What we claim is:] [1.] A head-mounted image display apparatus comprising:an image display device; andan ocular optical system for leading an image formed by said image display device to an observer's eyeball position without forming an intermediate image so that said image is observed as a virtual image,said ocular optical system including at least one reflecting surface having reflecting action,said at least one reflecting surface having a surface configuration defined by a plane-symmetry free form surface in a three-dimensional space which is a rotationally asymmetric surface, and which has only one plane of symmetry,a Z-axis is taken in a direction of prolongation of a line segment along which an axial principal ray from a center of an image display area of said image display device emanates from said ocular optical system and reaches a center of said observer's eyeball position,a Y-axis is taken in a direction perpendicular to said Z-axis in a plane containing a folded line segment along which said axial principal ray is reflected by said reflecting surface, andan X-axis is taken in a direction perpendicular to both said Z- and Y-axes, and the following condition is satisfied: 14