LED手術燈光學設計

Optical Design and Analysis of LED Operating Lamp

吳偉立(Wei-Li Wu)

指導教授 ： 蕭德瑛

國立清華大學/工學院/動力機械工程學系/碩士(2010年)

https://doi.org/10.6843/NTHU.2010.00377

摘要

由於高功率LED發光效率提高，LED已有機會使用於手術燈上。傳統之鎢鹵素燈體積大且效率低，尤其是會將許多電能用在紅外線波段，需加以處理否則將造成病人病情惡化及醫生不適，LED則無以上之缺點。但因光線射出形式之不同，且單一LED之流明數仍低，因此必需加上導引光線之二次光學設計，並利用多顆LED透鏡光學模組進行排列配光。本研究使用Tailored Freeform的方式產生光學面之輪廓，此為離散之設計方式，能精準的控制光線之行進方向，並利用對於光線的調控，產生符合手術燈要求之小出光角度且高平坦度之光學模組。接著使用此LED光學模組進行同心多環狀之手術燈配光設計，以較目前市售產品少之LED數達到手術燈要求之最大照度、平坦度、無影度等照明標準。

關鍵字

高功率發光二極體 ； 光學設計 ； 透鏡 ； 平坦度 ； 出光角度

並列摘要

High power LED(Light Emitting Diode) can be applied to surgical operating lamp due to the improvement of power efficiency of the LED. Comparing with LED, the traditional surgical operating lamp using halogen light source has disadvantages such as bid size and low efficiency. Especially, portion of halogen lamp spectrum belong to infrared rays and it generate a lot of heat which worsens the patients’ condition. Although the efficiency of LED is high, the brightness of the single LED is still not enough to be used in surgical light, therefore, it’s necessary to utilize plenty of LEDs and each LED needs an optical component to guide rays of light to satisfy the illumination specifications of surgical light. We use Tailored Freeform Method to compute the path of rays to generate the profile of a optical device to obtain a single LED optical module with high light intensity, high light uniformity and narrow light angle. Several single LED are arranged in concentric circle to allocate light to make total brightness satisfy the requirement of the surgical light. As a result, we can obtain a surgical operating lamp using less LED than current surgical lamps but achieving the specifications of surgical operating lamp’s requirements, the standard requirements include maximum central illumination, light distribution, shadow dilution and so on.

參考文獻

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