Title page for etd-1006114-152835


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URN etd-1006114-152835
Author Po-Hsun Lin
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Fabrication of shadow-less lamp with ellipse curved surface combined with metallic glass thgin film and free-form lens
Date of Defense 2014-11-05
Page Count 122
Keyword
  • LED
  • lens design
  • freeform
  • thin film metallic glass
  • elliptical curve
  • surgical shadowless lamp
  • Abstract Traditional surgical shadowless lamps are generally designed as projection type with many light bulbs as light source, but this kind of structures will not only occur mercury pollution but also heat radiation that increase the temperature on the target plane. An additional filter that will absorb the energy of light is necessary to block the radiation. In this thesis, LED (Light-Emitting Diode) is applied to replace the halogen lamp, and two different methods of designing surgical shadowless lamp are present, that is based on elliptical equation. A freeform uniform lens is designed to fix the problem of Lambertian distribution of LED, that prove the uniformity on the target plane. Besides, thin film metallic glass (TFMG), is applied as the material of reflective layer. TFMG have great mechanical properties that can extend the life term of lamp and the Ag-based TFMG is anti-bacterial. According to the result of simulation, the most outstanding model is the one with 3 elliptical curves designed by un-coaxial method, which central illuminance is 141,7801lux, and the d50/d10 is 60.8%, 36cm in depth of working. The shadow dilution with one/double masks are 63.6% and 57.1%, while 59.6% and 61% in a tube with one/double masks. After combination with freeform uniform intensity lens, central illuminance lightly decrease to 130,140lux, which is because the absorption of lens material. But d50/d10 have increased to 65% and the shadowless dilution with one/double masks are 65.7% and 53.6%, while 61.8% and 58.7% in a tube with one/double masks. And the depth of working is 36.5cm. Computer numerical control milling machine was used to fabricate the actual surgical shadowless lamp, illuminometer and spectrum were applied to measure the emission result. According to the measurement result, Ec is 110,500lux with 59.9% in d50/d10, shadow dilution with single/double masks are 58.96% and 56.16%, respectively, and 57.46% and 58.03% with a tube. The working depth is 32.8cm.
    Advisory Committee
  • Chi-Hui Chien - chair
  • Z. H. Liu - co-chair
  • Y. C. Chen - co-chair
  • J. C. Huang - co-chair
  • Cheng-Tang Pan - advisor
  • Files
  • etd-1006114-152835.pdf
  • Indicate in-campus at 99 year and off-campus access at 99 year.
    Date of Submission 2014-11-07

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