초록 ▼

An ocular optical system suitable for a head- or face-mounted image display apparatus which is compact, lightweight and satisfactorily corrected for aberrations, and in which no intermediate image is formed. The image display apparatus includes an image display unit (9) and an optical system (10) fo

An ocular optical system suitable for a head- or face-mounted image display apparatus which is compact, lightweight and satisfactorily corrected for aberrations, and in which no intermediate image is formed. The image display apparatus includes an image display unit (9) and an optical system (10) for projecting a displayed image into an eyeball (7). The optical system (10) is arranged such that light rays which are emitted from the image display unit (9) and enter the eyeball (7) are reflected at least three times by surfaces (12, 13 and 14) having power in backward ray tracing.

대표청구항 ▼

[ What we claim is:] [1.] An image display apparatus comprising:an image display unit for displaying an image, andan optical system for projecting said image into an observer's eyeball,said optical system including a prism member, said prism member having, from a side thereof closer to said observer

[ What we claim is:] [1.] An image display apparatus comprising:an image display unit for displaying an image, andan optical system for projecting said image into an observer's eyeball,said optical system including a prism member, said prism member having, from a side thereof closer to said observer's eyeball toward said image display unit, at least an exit surface having an action through which a bundle of light rays exits from said prism member; a first reflecting surface, a second reflecting surface and a third reflecting surface each having an action by which the light rays are reflected in said prism member; and an entrance surface having an action through which the light rays enter said prism member,said prism member being formed from at least three surfaces and a medium lying between said three surfaces, said three surfaces being arranged to attain the actions of said exit surface, said first to third reflecting surfaces and said entrance surface,wherein at least two of said three surfaces each have a reflecting action by which the light rays are reflected at least once or more, and said at least two of said three surfaces are disposed at respective positions facing opposite to each other across the medium, andwherein each of said two surfaces facing opposite to each other is a non-rotationally symmetric aspherical surface that gives a power to the light rays and corrects aberrations due to decentration.