Abstract
In this article, we have designed a surgical light lens especially for oral surgical illumination. It provides a uniform and wide field of view for illumination during oral surgery. The support system, a set of LEDs and a double free-form surface constituted the lighting system. The double free-form surface is composed of traditional free-form surface, designed total internal reflection lens and diffuse transmission plate, which improves the optical performance of the LED. When the light keeps dispersing the pupil constriction, it eventually causes our eyes to fatigue. The purpose of increasing diffuse transmission is to make the emitted light softer, thus making peoples’ eyes feel more comfortable. Based on the problems mentioned above, a numerical method is proposed as the basis for designing the double free-form surface. First, establishing a mathematical model based on the characteristics of the transmissive surface and the property of the LED. Henceforth, the nonlinear equations for the illumination distribution of the outside surface can be deduced. By solving the equation, the contour of the free-form surface is obtained. Later, we imported the contour into the 3D modeling software Solidworks to rotate so as to get the corresponding model. Finally, the simulation results suggest that the optical uniformity of the double free-form surface is able to reach as much as 86.18%.
Highlights
Compared with the traditional light sources, LEDs, as the fourth generation of illumination sources, enjoy many advantages such as small size, fast response, long life and pollution-free [1]
Where θmax is the maximum incident angle of the total reflection free-form surface of the total internal reflection (TIR) lens incident on the light source, θi is the angle between the light emitted by the light source and the y-axis, P0, P1, · · ·, Pi is the intersection of the line x = r when the incident angle is θ0, θ1, · · ·, θi, we supposed the OP1 unit vector be p1, and the unit direction vector of P1Q1 be q1, which is known by the space Snell theorem: where K is a constant and N is a unit normal vector
The uniformity of the illumination system with diffuse transmission free-form surface designed in this paper is significantly higher than other illumination systems
Summary
This work was supported in part by the Key Project of Industrialization of Invention Patents in Jiangxi Province under Grant 20161BBM26037, in part by the Program of Jiangxi Outstanding Youth Talent Assistance under Grant 20162BCB23047, and in part by the Science and Technology Pillar Program of Jiangxi Province under Grant 20151BBE50116.
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