Abstract
Conventional surgical operating lamp uses tungsten halogen lamp that results in surgical operating lamp with large volume, low luminous efficiency and high heat. LED doesn’t have the above disadvantages, but the illuminant of one LED’s is smaller than tungsten halogen lamp. So it needs many LEDs in one lamp to arrange array to reach requirement of the specification. Because surgeon operates that will meet different conditions, it needs a surgical operating lamp with abilities of adjustable focus and range of lighting. In order to accomplish the purposes, we design a surgical operating lamp with adjustable focus by rotating the handle to change the relative position between variable focus lens and LED. We design the suitable LEDs arrangement. Then use Tailored freeform method to design variable focus lens contour, and find the best contour by optimization. Simulated optical properties of lens with different conditions, and the results have to conform to specification and IEC-60601-2-41.