POLARIZED LIGHT SEPARATING ELEMENT, POLARIZED LIGHT CONVERTING ELEMENT, ILLUMINATOR, PROJECTOR, AND METHOD OF MANUFACTURING FOR POLARIZED LIGHT SEPARATING ELEMENT

摘要

PROBLEM TO BE SOLVED: To further improves the brightness of a picture displayed on a screen or the like in a projector. SOLUTION: A polarized light separating element is provided with a plurality of polarized light separating units having a polarized light separating plane and a reflecting plane and separating an incident luminous flux into an S polarizing luminous flux and a P polarizing luminous flux. The polarized light separating element is that for an illuminator for a projector. Where, the length of the polarized light separating units in the luminous flux separating direction is gradually shortened from the center of an optical axis toward a peripheral section. Alternatively, the polarized light separating element is provided with the plurality of polarized light separating units having the polarized light separating plane and the reflecting plane and separating the incident luminous flux into the S polarizing luminous flux and the P polarizing luminous flux. The polarized light separating element is that for the illuminator for the projector. Where, the arrangement pitch of the polarized light separating units in the luminous flux separating direction is gradually reduced from the center of the optical axis toward the peripheral section. COPYRIGHT: (C)2003,JPO