Down light using inner cavity reflector to achieve light distribution and light distribution design method of inner cavity reflector

Abstract

The invention discloses a down light using an inner cavity reflector to achieve light distribution. The down light includes a cavity, a light emitting part, the inner cavity reflector, and a face mask; the light emitting part and the inner cavity reflector are arranged in the cavity; the light emitting part is arranged in a light inlet of the inner cavity reflector; and an arc surface of a side of the inner cavity reflector is designed to be a parabolic surface which can allow light emitted from a geometric centre point of a light source to be parallel to each other via the inner cavity reflector. Through the inner cavity reflector of the down light and different dispersion angles of the light-transmittable face mask, batwing-shaped, water drop-shaped, inverted triangle-shaped, and Lambertian-shaped light distribution can be achieved; different from the conventional down light with a prepositioned dispersion mask, the down light generates an even illuminating effect; and a designer or a user can select the shape of light distribution suitable for themselves as required, and the down light has various functions.

Description

technical field [0001] The invention relates to the field of semiconductor lighting, and more specifically relates to a downlight using an inner cavity reflector for light distribution and a design method for the light distribution of the inner cavity reflector of the downlight. Background technique [0002] LED downlights on the market now generally have two structures, one with a front-facing light-emitting mask and one with a built-in light-emitting mask. [0003] For front-mounted downlights, the light emitted by the LED is usually mixed by the internal diffuse cavity, and then emitted evenly through the diffuser mask to obtain a light distribution similar to Lambertian. [0004] Built-in downlights are usually equipped with external reflectors, which can be diffused or mirrored to achieve batwing or drop-shaped light distribution. [0005] Both of the above have their own unrealizable design flaws. For example, the batwing light distribution cannot be achieved with th...

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Problems solved by technology

For example, the batwing light distribution cannot be achieved with the front-mounted mask, and the UGR (Unified Glare Rating) is usually relatively high, resulting in severe glare; and some users do not like to choose the downlight with the built-in mask when decorating because this kind of downlight does not When the lights are turned on, the human eye sees "black holes" one by one, which is inconsistent with the entire horizontal ceiling

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