| 摘要 |
An optical system for an ocular optical system or a projection optical system, in which a plurality of illuminating light sources of different colors can be placed in a side-by-side relation to each other, and which makes it possible to reduce the overall size and weight of an apparatus such as a head-mounted image display apparatus or a color film projection apparatus. The optical system has an image-forming optical system (1) that projects a real image or virtual image of an object placed in an image plane (3). The image-forming optical system (1) has an entrance pupil (5) at a position on the side of the image plane (3) remote from the image-forming optical system. An exit pupil (4) is located in a conjugate relation to the entrance pupil (5) with respect to the image-forming optical system (1). A chromatic aberration producing device (6) is provided between the entrance pupil (5) and the exit pupil (4). Even if a plurality of illuminating light sources of different colors are placed in a side-by-side relation to each other on the entrance pupil (5), rays from the different light sources can pass the exit pupil (4), being superimposed on one another, without chromatic aberration.
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