| 摘要 |
A secondary optical lens (105) includes a base plane (1054), a light incident surface (1053), a light emitting surface (1055), and two fasteners (1052). The light incident surface (1053) is a concave surface and is located in the center of the base plane (1054). The light emitting surface (1055) is formed by two partial spherical surfaces and a transition surface between the two partial spherical surfaces. The light emitting surface (1055) is connected to the base plane (1054) and defines the boundary of the base plane (1054). The two fasteners (1052) are respectively disposed at two edges of the base plane (1054) in a longitudinal direction. |
