Patent ID: 7056630
Filing Date: 2006-06-06
Classification: G02B,G03F

Abstract:
1. A color wheel fabrication method, in which a color wheel including a disk-shaped substrate made of a light-transmittable medium and a plurality of filters arranged on the substrate is fabricated, each filter being capable of selectively transmitting rays of light having a desired wavelength, the method comprising the steps of: (1) applying a photoresist onto an entire area at a front side of the disk-shaped substrate; (2) masking areas except a first predetermined area of the substrate covered with the photoresist using a photomask to remove the photoresist resting on the first predetermined area by exposure and subsequent development; (3) forming a first color-transmittable film on an entire area at the front side of the substrate resulting from step (2); (4) performing a lift-off process to remove the first color-transmittable film resting on the photoresist, thereby shaping the first color-transmittable film to cover the first predetermined area; (5) applying a photoresist onto an entire area at the front side of the substrate resulting from step (4); (6) masking part of the first color-transmittable film and a third predetermined area of the substrate covered with the photoresist using a photomask from a back side of the substrate to remove the photoresist resting on a second predetermined area by exposure from the back side of the substrate and subsequent development; (7) forming a second color-transmittable film on an entire area at the front side of the substrate resulting from step (6); (8) performing a lift-off process to remove the second color-transmittable film resting on the photoresist, thereby shaping the second color-transmittable film to cover the second predetermined area; (9) applying a photoresist onto an entire area at the front side of the substrate resulting from step (8); (10) performing exposure of an entire area of the substrate from the back side of the substrate and subsequent development to remove the photoresist resting on the third predetermined area; (11) forming a third color-transmittable film on an entire area at the front side of the substrate resulting from step (10); and (12) performing a lift-off process to remove the third color-transmittable film resting on the photoresist, thereby shaping the third color-transmittable film to cover the third predetermined area.