Patent ID: 7048390

Claim:
A producing method of an optical device, the optical device including a plurality of optical modulators that modulates a plurality of color lights in accordance with image information for each color light, and a color combining optical system having a plurality of light-incident surfaces for the optical modulators to be attached and a light-irradiating surface that combines and irradiates the color light incident on the light-incident surface, the method comprising the steps of: obtaining average optical characteristics of a projection optical system combined with the optical device; setting a reference position of a light beam sensor for detecting a light beam irradiated from the light-irradiating surface of the color combining optical system based on a designed position of any one of the optical modulators relative to the color combining optical system; setting a calibrated position relative to the designed position based on the average optical characteristics of the projection optical system; moving the light beam sensor to the calibrated position; mounting an optical device to be adjusted; adjusting the position of the optical modulator while detecting the light beam irradiated from the light-irradiating surface of the color combining optical system by the light beam sensor; and fixing the position of the optical modulator of which position is adjusted.