| 摘要 |
The present invention has as its object to provide a thin type optical system which enables both of image information displayed on display means such as a liquid crystal display to be observed and image information of which image is substantially equal to the image observed via therethrough and which is taken by image pickup means and a compound display apparatus using such optical system. For this object, the optical element according to the present invention is an optical element having on the same medium an incidence surface, an emergence surface and a plurality of eccentric reflecting surfaces eccentric relative to a reference ray Ri and having power, at least one of the plurality of eccentric reflecting surfaces being a dual purpose surface used as a transmitting surface and reflecting surface, wherein a beam incident from the incidence surface is reflected by the plurality of eccentric reflecting surfaces to thereby fold an optical path and is caused to emerge from the emergence surface, and is characterized in that the meridional section composite power of the optical element is negative.
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