| 摘要 |
An exemplary optical lens (10) for modulating light emitted from a light source (101) to form a circular light field includes a first surface (110), and a second surface (120) opposite to the first surface (110). The first surface (110) defines a recess (111) for receiving the light source (101). The recess (111) has a side surface (1112) as a light entrance surface. The second surface (120) is a light exit surface. The side surface (1112) and the second surface (120) cooperatively modulate the light from the light source (101), such that an angle of a full width at half maximum of the intensity of a light field, which is formed by the light emitted from the optical lens (10), is larger than 80 degrees. |
