| 摘要 |
An optical path splitting element for splitting a light beam from a single object into at least two optical paths is made compact in size by using a three-dimensional optical system and given a power to reduce the number of components thereof. An image display apparatus uses the optical path splitting element. The optical path splitting element has a prism member having an entrance surface through which the light beam from the object enters the prism member, at least one reflecting surface reflecting the light beam within the prism member, and an exit surface through which the light beam exits the prism member. The prism member has at least one rotationally asymmetric surface. At least one optical functional surface is a discontinuous surface formed from at least two surfaces adjacent to each other. The other optical functional surfaces are common to the at least two optical paths.
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