Condenser lens and lamp using same

Abstract

The invention relates to a condenser lens and a lamp using the same. The condenser lens is truncated cone-shaped and is symmetric relative to the lens axis. The condenser lens is characterized in that the middle of a first end surface with smaller diameter sinks inwards to form a light source accommodating cavity for adaptively accommodating the LED light source and the bottom surface of the light source accommodating cavity protrudes outwards to form a first sphere; the middle of a second end surface with larger diameter protrudes outwards to form a second sphere; and a side wall of the condenser lens is a fully reflecting surface, the generatrix of the truncated cone-shaped lens is a fold line and is formed by connecting multiple line segments in sequence, and the multiple line segments and the lens axis form an angle shown in the specification, wherein n is the index of refraction in lens. The invention condenses the light from any angle of the LED light source, fully utilizes the light from the LED light source, ensures the radiant angle of the emergent light of the condenser lens to be less than 5 degrees and greatly improves the condensation effect.

Description

【Technical field】 [0001] The invention relates to a lens, in particular to a condensing lens suitable for an LED light source and a lamp using the condensing lens. 【Background technique】 [0002] With the development of manufacturing technology and semiconductor technology, LED light source has increasingly become a substitute for traditional light source due to its low power consumption and high brightness. [0003] However, the LED light source is limited by its own characteristics, the radiation angle is large, and it is easy to spread. When using an LED light source, it needs to be concentrated. [0004] At present, the concentrating method of the LED light source generally adopts a parabolic reflector, but in order to achieve a very small luminous angle (such as a luminous angle of less than 5 degrees) in this way, the size of the reflective cup must be made relatively large, otherwise the luminous angle of the LED light source will be relatively large. The small ligh...

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Problems solved by technology

[0004] At present, the concentrating method of the LED light source generally adopts a parabolic reflector, but in order to achieve a very small luminous angle (such as a luminous angle of less than 5 degrees) in this way, the size of the reflective cup must be made relatively large, otherwise the luminous angle of the LED light source will be relatively large. The small light cannot be utilized, resulting in a larger final luminous angle of the LED light source, and a waste of a lot of manufacturing materials

There is also a convex lens to concentrate the LED light source, but in this way, the light with a large LED luminous angle cannot be used, and the utilization rate of the luminous flux of the LED light source is relatively low, which eventually leads to a low light efficiency utilization rate of the lamp.

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