Optical path shift optical system, pixel shift projection optical system, and pixel shift projection apparatus

摘要

PPROBLEM TO BE SOLVED: To solve the following problems, regarding a projector for enlarging and projecting an image displayed in a spatial optical modulation element, a method for shifting pixels by using an optical path shifting element in order to display the image of high image quality is introduced, and then, the image composed of pixels twice or four times as many as the number of pixels of the spatial modulation element can be apparently displayed by using the double refractivity of vertical orientation type ferroelectric liquid crystal and a liquid crystal orientation control operation princple by a voltage apply means, but, the wave front aberration of transmitted light wave increases as the NA of the luminous flux incident on the pixel shifting means is increased, then, the light condensation characteristics of a spot displayed through an imaging optical system tend to deteriorate. PSOLUTION: An NA conversion optical system 20 is arranged ahead of the pixel shifting means 21, the system 20 is constituted so that both cavities on the object side and the image side are telecentric, and the NA of the outgoing luminous flux is converted to be smaller than the NA of the luminous flux made incident from the object side. PCOPYRIGHT: (C)2006,JPO&NCIPI