PROBLEM TO BE SOLVED: To provide a patterned light irradiation apparatus which can irradiate sinusoidal patterned light suitable for image processing at low cost.;SOLUTION: A pattern projection unit 1 for irradiating an object under measurement 200 with patterned light, comprises a projection pattern 12 in which a plurality of opening parts having a predetermined opening width are provided at predetermined intervals, a light source 10 and a collecting lens 11 for irradiating the projection pattern 12 with light, and a projection lens 13 for integrally collecting light passed through the projection pattern 12 and irradiating the object under measurement 200 with the collected light. The projection lens 13 is placed out of focus so that an image of the projection pattern 12 is not formed on the object under measurement 200. The image of the projection pattern 12 is thereby projected onto the object under measurement 200 as a sinusoidal pattern.;COPYRIGHT: (C)2007,JPO&INPIT
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