초록 ▼

A compact and lightweight visual display apparatus which enables observation of an image that is clear throughout the image field at a field angle of 120.degree. when the user observes with both eyes, and which has a large exit pupil diameter. The visual display apparatus has a two-dimensional image

A compact and lightweight visual display apparatus which enables observation of an image that is clear throughout the image field at a field angle of 120.degree. when the user observes with both eyes, and which has a large exit pupil diameter. The visual display apparatus has a two-dimensional image display device (6) for displaying an image for observation, a relay optical system (5) for projecting a real image of the two-dimensional image display device (6) in the air, an ocular magnifier (3) for projecting the real image in the air as an enlarged image and for reflectively bending an optical axis, and a decentered correcting optical system (4) disposed between the relay optical system (5) and the ocular magnifier (3) and having surfaces (41 and 42) decentered with respect to each other. The decentered correcting optical system (4) is arranged such that the vertex (43) of the surface (41) which is closer to the ocular magnifier (3) lies inward of the visual axis (7) after it has been reflected by the ocular magnifier (3), and the ocular magnifier-side surface (41) is an aspherical surface formed from such a curved surface that the refractive power reaches a maximum in the vicinity of the surface vertex (43) and becomes weaker as the distance from the vertex (43) increases toward the outer side. The apparatus may be arranged to correct the diopter by making at least one optical element movable.

대표청구항 ▼

[ What we claim is:] [1.] A visual display apparatus comprising a two-dimensional image display device for displaying an image for observation, a relay optical system for projecting a real image of said two-dimensional image display device in the air, an ocular magnifier for projecting said real ima

[ What we claim is:] [1.] A visual display apparatus comprising a two-dimensional image display device for displaying an image for observation, a relay optical system for projecting a real image of said two-dimensional image display device in the air, an ocular magnifier for projecting said real image in the air as an enlarged image and for reflectively bending an optical axis, and a decentered correcting optical system disposed between said relay optical system and said ocular magnifier and having surfaces decentered with respect to each other,wherein said decentered correcting optical system is arranged such that a vertex of the surface thereof which is closer to said ocular magnifier lies inward of a visual axis after it has been reflected by said ocular magnifier, and an ocular magnifier-side surface is an aspherical surface which is formed from such a curved surface that refractive power reaches a maximum in the vicinity of the surface vertex and becomes weaker as the distance from the surface vertex increases toward the outer side.