Patent ID: 7425072

Claim:
An apparatus for displaying a 3-D image comprising: a projector that has a projection optical system, and projects a series of 2-D images at different projected-positions in a depth direction, in order, by using light passing through said projection optical system, each 2-D image being formed on a basis of section-views of a 3-D object in said depth-direction; a projection controller that adjusts a projection-timing of said series 2-D images, and controls said projection optical system in accordance with said projection-timing so as to focus each 2-D image and maintain a constant magnification of said series of 2-D images; and a screen driving mechanism configured to intermittently position a series of screens at said projected-positions in order, said projector projecting each 2-D image on a corresponding screen, said projection controller controlling said screen driving mechanism so as to synchronize positioning of said corresponding screen with said projection-timing, wherein said projection controller comprises a camshaft that shifts a position of said projection optical system along an optical axis, in accordance with said projection-timing, said projection controller controlling said camshaft so as to synchronize with said projection-timing, and wherein said screen driving mechanism intermittently positions said series of screens by rotating motion, and said camshaft shifts said projection optical system while linking a rotation motion according to said screen driving mechanism, and wherein said projector repeatedly and successively projects said series of 2-D images so as to cause an afterimage-effect.