Brother Kogyo Kabushiki-Kaisha

Yasuhiro Ideno

Yasuomi Jibu

Junji Fujitani

A lens includes a lens portion having two opposite oblong surfaces at least one of which is a curved lens surface having a reflective power. A cross-sectional area of the lens portion varies from a center toward each end in a longitudinal direction of the lens portion. A rib portion is disposed at each of two opposite sides of the lens portion adjacent to longer sides of the oblong surfaces of the lens portion, and extends along the longitudinal direction of the lens portion. A cross-sectional area of the rib portion varies along the longitudinal direction in a manner that renders variations of a cross-sectional area of a portion including the lens portion and the rib portion along the longitudinal direction of the lens portion smaller.

Long-length lens

A lens including a lens portion having two opposite oblong surfaces at least one of which is a curved lens surface having a refractive power is disclosed. At both ends in a longitudinal direction of the lens portion, first and second flange portions are provided each of which tapers toward the lens portion and has a slant surface slanting with respect to the longitudinal direction of the lens portion and connected with one of the oblong surfaces. An angle of the slant surface of the first flange portion with respect to the longitudinal direction of the lens portion is different from an angle of the slant surface of the second flange portion with respect to the longitudinal direction of the lens portion.

Lens and method for manufacturing same

A lens including a lens portion having first and second opposite oblong surfaces is disclosed. At least one of the first and second oblong surfaces of the lens portion is a curved lens surface having a reflective power. A rib portion is disposed at each of two opposite sides of the lens portion facing in a direction of a width of the first oblong surface. The rib portion extends along a longitudinal direction of the lens portion in a position separate from the second oblong surface. A draft surface extends between the second oblong surface and the rib portion. The draft surface includes a slant surface slanting outwardly toward the rib portion. The slant surface is curved inwardly with a draft thereof increasing gradually toward the rib portion.

Growing community of inventors

Seto, Japan

Yasuhiro Ideno