LIGHTING EMITTING OPTICAL DEVICE

摘要

The present invention relates to a pintail square lens. The pintail square lens according to an embodiment of the present invention includes: a curved incidence surface where the light emitted from a light source arranged on an optical shaft penetrates; and a curved emission surface emitting the light entering through the curved incidence surface. The curved incidence surface and the curved emission surface are formed to make a rotational symmetry from the optical shaft. The pintail square lens can increase the light emission angle and adjust the intensity of the light according to the emission angle to even out the light brightness distribution, thereby enabling the implement of a thin and flat lighting device.