Patent ID: 8950880
Filing Date: 2015-02-10
Classification: G03B

Abstract:
1. A lighting device comprising: a plurality of light emitting devices which emit lights of wavelengths within the visible ray domain; and an opening arranged in front of the plurality of light emitting devices, wherein the plurality of light emitting devices are arranged in a medium having a low refraction index, and solid structures that are formed of a medium having a high refraction index, are capable of transmitting visible rays therethrough, and are periodically formed on a portion of the opening to face the plurality of light emitting devices in the medium having a low refraction index, wherein the solid structures are formed in a period such that lights emitted by the plurality of light emitting devices are not reflected, wherein, at the opening, the solid structures are arranged in a first period in front of the center region of the plurality of light emitting devices, and the solid structures are arranged in a second period in front of the peripheral region of the plurality of light emitting devices, wherein the second period is greater than the first period.