Illumination device

摘要

An illumination device includes a base, a light-emitting module, a first layer, and a second layer. The light-emitting module is disposed on the base for generating a progressive-type light-emitting intensity. The first layer encapsulates the light-emitting module. The second layer encloses the first layer. The second layer has a progressive-type thickness corresponding to the progressive-type light-emitting intensity, and both the progressive-type light-emitting intensity and the progressive-type thickness are decreased or increased gradually, thus the progressive-type light-emitting intensity can be transformed into the same light-emitting intensity through the progressive-type thickness of the second layer.

主权项

1. An illumination device, comprising:
a base; a light-emitting module disposed on the base for generating a progressive-type light-emitting intensity; a first layer encapsulating the light-emitting module; and a second layer enclosing the first layer and having a phosphor powder, wherein the second layer has a progressive-type concentration of the phosphor powder corresponding to the progressive-type light-emitting intensity, both the progressive-type light-emitting intensity and the progressive-type concentration of the phosphor powder are decreased or increased gradually, and the progressive-type light-emitting intensity is transformed into the same light-emitting intensity through the progressive-type concentration of the phosphor powder in the second layer; wherein the light-emitting module includes at least one optoelectronic component disposed on the base and directly under a topmost point of the first layer, the progressive-type light-emitting intensity generated by the at least one optoelectronic component is a function of θ defined by I(θ)=I0 cos θ, and the progressive-type concentration of the phosphor powder is a function of θ defined by D(θ) =cI0 cos θ, wherein θ is a light-emitting angle of the at least one optoelectronic component relative to a vertical center line vertically passing through a center point of the at least one optoelectronic component, I0 is a maximum light-emitting intensity generated by the at least one optoelectronic component, and c is a constant number.