Primary optical design of LED light source
Each LED light source has a specific light intensity distribution characteristic, that is, a light distribution curve. We call this process an optical design. In most cases, the light distribution curve of the LED light source is Lambertian, that is, the angular intensity of the hair is a cosine distribution with the angle change:
Several other common LED light sources are used at once:
The interaction between the primary light distribution and the secondary optical design of the LED light source is very important. In order to facilitate the design of the secondary light source lens, a light source that does not change the light emission law of the original chip should be used as much as possible, that is, the light output characteristic is a Lang wave type. LED light source.
Secondary optical design of LED light source
Under normal circumstances, the light source angle and light intensity distribution of the LED light source cannot meet the application conditions under the characteristic condition, so it is necessary to perform secondary light distribution to change the light output of the light source to meet the practical application requirements.
The main role of secondary optical design is usually the following three types:
1. Dispersion: Disperse the light from the LED source to form a larger angle to achieve a more uniform spot on the receiving screen (planar) (such as ceiling lights, direct-lit TV backlight lenses, etc.).
2. Convergence: Gather the light from the LED source to a smaller range to increase the center illumination intensity (eg, projection lights, stage lights, etc.).
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