Patent ID: 6979144

Claim:
An optical linkage device for securing a first part and a second part, the first part including a first threaded portion, and the second part including a second threaded portion that is screwable to the first threaded portion, wherein the first part and the second part may be comprised of a lens member or a body housing imaging elements, including either of a CCD sensor or a CMOS sensor, the optical linkage device comprising: a plurality of positioning recesses that are formed at a circumference of the first part such that a plurality of said recesses are located in a one-fourth portion of the circumference; a plurality of positioning protrusions that are formed in the second part, the positioning protrusion being selectively engageable with the recess members when threading the first part onto the second part wherein said recesses and said protrusion are rounded; and a means for securing the first part and the second part in a permanent fixed relationship, wherein all of said plurality of positioning protrusions are positioned in some of said plurality of positioning recesses when the first part and the second part are fixed to each other.