Abstract
Due to the good performance in power efficiency of the LED (Light Emitting Diode), using LED as an alternative choice of light source of surgical operating lamp is a good idea. Halogen lamp which is used for traditional surgical operating lamp has some problems such as big size and low efficiency,. In addition to the size and efficiency, the spectrum of the Halogen lamp has some energy belong to infrared ray which makes the patient and the surgeon stay in high temperature environment. Although LED has high efficiency, its total lumen is lower than halogen lamp, therefore, it is necessary to use many LED to achieve the illumination specifications. This research tries to design a surgical optical lens to guide light ray to specific area, and design the configuration for many LED to achieve the illumination specifications required by surgical operating lamp standard. This research design the shape of hollow tube of the lens, the profile of total reflection surface of the lens and front lens with Tailored Free-Form method. This method can make design procedure more effective and faster than the method which adjusting the parameters of none aspheric curve. The simultaneous equations are solved to find the path for a large number of light rays and multi-LED arrangement, respectively. We also fabricate the lens and do some experiment to test and the results are used to verify the simulation result. This research finds out how hollow tube, total reflection surface and front lens influence max luminance, luminance distribution and color distribution.