Patent ID: 8665524
Filing Date: 2014-03-04
Classification: B41J,G02B

Abstract:
1. A lens comprising: a lens portion having two opposite oblong surfaces, at least one of which is a curved lens surface having a refractive power, a cross-sectional area of the lens portion varying from a center of the lens portion toward each end of the lens portion in a longitudinal direction of the lens portion; and a rib portion disposed at each of two opposite sides of the lens portion that are adjacent to longer sides of the oblong surfaces of the lens portion, the rib portion extending along the longitudinal direction of the lens portion, wherein a cross-sectional area of the rib portion varies along the longitudinal direction in a manner that reduces variations of a cross-sectional area of a portion including the lens portion and the rib portion along the longitudinal direction, wherein a dimension of the lens portion in an optical axis direction decreases along a length of the lens in the longitudinal direction from the center of the lens portion toward each end of the lens portion, and wherein a dimension of the rib portion in the optical axis direction increases along a length of the rib portion in the longitudinal direction from the center of the rib portion toward each end of the rib portion.