Patent ID: 11892154
Assignee: NIPPON SHEET GLASS COMPANY, LIMITED
Field: Optics (Instruments)
Classification: CPC F  G | IPC F

Claim 0:
1. An illumination device, comprising:
a light source including at least one light emitting portion;
a first optical element configured to receive light output from the light source and output the light while expanding an output angle thereof; and
a second optical element configured to receive light output from the first optical element and output the light while further expanding an irradiation angle thereof;
wherein the first optical element is a microlenses array;
wherein the microlenses array includes a first region including a center C of the first optical element and a second region around the first region; and
wherein the first region includes a plurality of microlenses having a substantially constant sag, and the second region includes a plurality of microlenses whose sag decreases as the distance from the center of the first optical element increases.