| 摘要 |
A lens distributing light, predominantly toward a preferential side, from a light emitter having an emitter axis and defining an emitter plane has an emitter-adjacent base end forming an emitter-receiving opening to an emitter-surrounding cavity having an inner surface which includes a front sector centered on the preferential side and a back sector centered on the radially opposite non-preferential side. The front and back sectors differ in their respective configurations for refracting light from the emitter. The lens further includes an primary back surface positioned and configured to receive and totally reflect light from at least a portion of the inner-surface back sector The inner-surface back sector and the primary back surface extend along substantially elliptical cross-sections in planes substantially parallel to the emitter plane. The base end forms a back opening to a back cavity substantially centered on the non-preferential side and partially bounded by the primary back surface |
