Lens, LED module and illumination system having same

An LED module having at least an LED, and at least a lens mounted in the light path of one LED, the lens comprising:

• an optical axis;
• a light source recess for disposing a light source;
• a first light emitting surface facing to the light source recess;
• and
• a second light emitting surface intersecting with the first light emitting surface and being on same side of the light source recess with the first light emitting surface, an intersecting line formed between the first light emitting surface and the second light emitting surface, and having a cross point with the optical axis, a profile of section of the first, second light emitting surface, which is taken along the optical axis and perpendicular to the intersecting line, having at least one tangent line which has an acute angle with the optical axis along the emitting orientation of the light emitted from the first, second light emitting surface, the profiles of the first, second light emitting surface being asymmetrical in shape to the optical axis.

A illumination system comprising:

• an illuminated area;
• and
• at least one LED module, the LED module comprising:
• at least an LED;
• and
• at least a lens mounted in the light path of one LED, the lens comprising:
• an optical axis;
• a light source recess for disposing a light source;
• a first light emitting surface facing to the light source recess;
• and
• a second light emitting surface intersecting with the first light emitting surface and being on same side of the light source recess with the first light emitting surface, an intersecting line formed between the first light emitting surface and the second light emitting surface, and having a cross point with the optical axis, a profile of section of the first, second light emitting surface, which is taken along the optical axis and perpendicular to the intersecting line, having at least one tangent line which has an acute angle with the optical axis along the emitting orientation of the light emitted from the first, second light emitting surface, the profiles of the first, second light emitting surface being asymmetrical in shape to the optical axis.