用于生发治疗的大功率LED阵列的光均匀性设计

Light Uniformity Design of the High Power LED Array Used in the Hair Restoration

现有的生发治疗仪多采用普通小功率的LED芯片,光功率密度低,均匀性差,因此有相当一部分头皮虽然在治疗仪内,但功率密度过低,得不到有效治疗。拟定功率密度波动在50%左右为基准,采用光学模拟和实验分析相结合的方式对大功率LED的光均匀性进行设计。首先,确定功率密度波动在50%左右的单颗LED半径、2颗LED的间距,以及三角形、正方形两种阵列单元的LED间距。在此基础上,讨论了半径为95mm的平面生发治疗仪中,三角形、正方形以及圆形阵列的光均匀性分布情况,得出:这三种阵列的功率密度波动在50%范围内的面积百分比均大于75%,且依次增加;LED的颗数和最大功率密度也依此增大。因此,生发治疗仪的大功率LED的阵列形式,可以选择圆形阵列,其均匀性较好,功率密度较高,相应的治疗效率也较高。

The light uniformity of the present hair restoration apparatuses used the ordinary low power is poor,and the power density is too low,so that a considerable part of the scalp in the apparatuses are not effectively treated.In this paper,the power density fluctuations are in the 50% range.Based on this,in the way of the combination of optical simulation and experimental test,under the conditions of the power density fluctuations in the range of 50%,the distance of single LED,2LEDs are tested,and the distance of LEDs in triangular array unit and square array unit are tested.On the basis of this,we discuss the distribution of light uniformity in triangle,square and circular array in the hair restoration apparatus of plane with radius of 95 mm.It is concluded that in these three arrays,the area percentage of the power density in the 50%range all are more than 75%,and gradually increases.The number of LED used also gradually increases.Optical power density gradually increases.The conclusion is that circular array of high-power LEDs can be selected to be used in the hair restoration apparatuse,which has better uniformity,higher power density and higher corresponding treatment efficiency.