| 摘要 |
The invention relates to an optical system which is compact and light in weight with well corrected aberrations, and is suitable for use on an image display device designed to form no intermediate image, and an optical system best usable as an ocular optical system for use on a head- or face-mounted image display device. This optical system comprises an optical element 7 and a diffraction optical element 8 that are mutually decentered. Optical element 7 comprises at least three juxtaposed optical surfaces, at least one of which is constructed of a curved surface. Between the optical surfaces at least two reflections occur. Spaces between the optical surfaces are filled with a medium having a refractive index greater than 1. A light ray emerging from an image display element 6 is incident on the optical system and upon transmission through a first transmitting surface 5 of optical element 7 located in opposition thereto, is reflected at a first reflecting surface 3 and at a second reflecting surface 4, so that the light ray is guided to an eyeball of an observer upon transmission through a second transmitting surface 3.
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