Patent ID: 7145724

Claim:
An optical lens manufactured by drawing a preform, the optical lens having orthogonal X, Y and optical axes, the optical lens comprising: an upper surface, a lower surface, a light-entrance surface, and a light-exit surface, each surface generally extending in the X-axis direction; an optically effective portion formed as a plurality of curved surfaces on at least one of the light-entrance surface and the light-exit surface, for acting in the X-axis direction on respective light components emitted from light-emitting parts of a light-emitting device, each of the plurality of curved surfaces extending between the upper surface and the lower surface and being parallel to an axis oblique to the Y-axis; and a pair of protrusions integrally formed in the surface having the optically effective portion, on both sides of the optically effective portion, the protrusions projecting in the optical axis direction beyond the optically effective portion, the protrusions extending between the upper surface and the lower surface, and being parallel to the oblique axis.