Patent ID: 7362519

Claim:
An optical unit comprising: a first plastic lens molded by an injection molding process, the first plastic lens comprising a flange having an outer circumference side surface and a protrusion edge on a rear portion of said outer circumferential side surface extending radially outward from said outer circumferential side surface; and a lens barrel having a first lens housing groove; the first plastic lens being fitted in the first lens housing groove so that the protrusion edge is located outside the first lens housing groove; a second plastic lens molded by the injection molding process, the second plastic lens comprising a flange having an outer circumference side surface and a protrusion edge an a rear portion of said outer circumferential side surface extending radially outward from said outer circumferential side surface; the lens barrel having a second lens housing groove behind the first lens housing groove, wherein the second housing groove has a larger diameter than the first lens housing groove, and the second housing groove having a tapered edge, the tapered edge being chamfered so that the second lens housing groove has a lens receiving opening widened outside; the second plastic lens being fitted in the second lens housing groove so that a front surface of the second plastic lens comes in contact with a rear surface of the first plastic lens; and the protrusion edge on said outer circumferential side surface of the flange of the second plastic lens being located on the tapered edge of the second lens housing groove.