Patent ID: 7036998

Claim:
An optical part for a sleeve for an optical module for optically coupling an optical device to an optical fiber, said optical part comprising: a light-transmitting portion, transparent to light propagating through said optical fiber, having a pair of faces intersecting a predetermined axis extending along a predetermined face, one of said pair of faces being provided so as to abut against an end of said optical fiber, the other of said pair of faces being tilted with respect to a plane orthogonal to said predetermined axis; a supporting portion provided adjacent to said light-transmitting portion and provided to be held with said sleeve; and a protrusion having a reference surface extending along said predetermined face, said protrusion comprising first to third portions projecting from said supporting portion in a direction of another axis intersecting said predetermined axis, said reference surface being provided with said first portion and having a first area adjacent to said second portion, a second area adjacent to said third portion, and a third area positioned between said first and second areas; wherein a distance between said first area and said supporting portion is greater than that between said third area and said supporting portion, and a distance between said second area and said supporting portion is greater than that between said third area and said supporting portion; and wherein said optical part is constituted by material transparent to light associated with said optical device.