| 摘要 |
A focusing lens (100) for an LED (2), which concentrates light emitted from the LED (2) so as to have directionality parallel to an optic axis (4), comprises: a transparent body (110); a first lens part (200) formed in the body; and a second lens part (300) covering the first lens part (200), and wherein the first lens part (200) comprises: parallel first and second convex aspheric lens surfaces (210,220), and wherein the second lens part (300) comprises: a plane of incidence (310) formed to protrude from an outer circumference of the first aspheric lens surface (210), the plane of incidence (310) into which the LED (2) is inserted and which is configured to allow the light emitted from the LED (2) to be incident and refracted; a plane of reflection (320) formed to have a convex curved surface which extend and slopes to be progressive wider from the plane of incidence (310) towards the second aspheric lens surface (220), the plane of reflection (320) which is configured to allow the light emitted from the LED (2) to be totally reflected; and a plane of emission (330) formed to have a concave curved surface which extends and slopes from the plane of reflection (320) towards the second aspheric lens surface (220), the plane of emission (330) which is configured to allow the light emitted from the LED (2) to be refracted and emitted as light being parallel to the optic axis (4). The focusing lens minimizes loss of the light emitted from the LED (2) and maximally reduces an angle of the emitted light, to effectively illuminate a local region at a long distance. |
