| 摘要 |
A projecting optical system includes, in order from the side of a screen, a first lens unit of positive refractive power of retrofocus type and a second lens unit composed of one positive lens, wherein parameters of the projecting optical system are determined such that an off-axial principal ray crosses an optical axis between the first lens unit and the second lens unit, and the following condition is satisfied:0.2<D2f/f<0.95(1)where D2f is a distance from a vertex of a lens surface facing the screen side of the second lens unit to an original-image display plane, and f is a focal length of the projecting optical system.
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