Lens of LED light source for road lamp and road lamp using the same

Abstract

The invention relates to the field of street lamp lighting, in particular to an LED light source lens for a street lamp and the street lamp using the lens. The LED light source lens for the street lamp comprises a lens body; the side part of the lens body is partially or totally full inner reflecting surface; the bottom surface of the lens body is a light emergent surface; the middle part of the light emergent surface is provided with a concave pit; the concave pit along the light emitting direction is a diffuse type opening; the upper surface of the concave pit is an emergent surface; light which is incident on the emergent surface directly emits out of the lens; the side of the concave pit is a reflecting surface; and light which is incident on the reflecting surface generates full inner reflection. The invention also discloses the street lamp using the lens. The lens can effectively disperse light beams of an LED light source, and control light distribution to ensure that light spots are rectangular; and light in an irradiation area has even illuminance.

Description

technical field [0001] The invention relates to the field of street lamp lighting, in particular to a lens of an LED light source for a street lamp and a street lamp using the lens. Background technique [0002] At present, street lamps are generally mercury lamps or sodium lamps. Mercury lamps or sodium lamps consume a lot of power. They are gas discharge light sources with short service life, easy damage, and high maintenance costs. LED light source is a semiconductor optoelectronic device, which has the characteristics of long life, low power consumption, firmness and reliability, and will be widely used in the field of lighting, especially street lamps. However, the early LED street lamps often used LED light sources with a small half-peak beam angle, which has strong directionality. Using these types of LED street lamps, the beams irradiated on the road are too concentrated, and the illumination range is small, which can only form an area on the road. The smaller circu...

AI Technical Summary

Problems solved by technology

However, the existing LED street light lens design often only pays attention to the illuminance requirements on the main road surface (carriageway), and the illuminance on both sides of the road surface is very weak, which cannot meet the requirements of the environmental ratio.

At the same time, the light intensity design in the longitudinal direction of the road is also too concentrated in the rectangular spot. This design is likely to cause uneven light intensity at the intersection between two lights. When the light spots overlap, the overlapping part has too high light intensity. When the light spots do not overlap The splicing is often prone to produce gaps with too low illumination, forming the so-called "zebra effect"

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