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10 February 2005 Light-weight objective lens for DVD pickup
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The size and weight of the pickup head will influence the form factor and the bandwidth of DVD. A MEMS-type DVD pickup was proposed, in which the objective lens will be manipulated with a micro actuator for focusing. A high order diffractive objective lens has been designed specially for meeting the request on reduced weight by optimizing the surface relief profile of each zone one by one. The simulation by ray tracing tool shows a well corrected geometrical aberration and a near diffraction limit focal spot. The lens is expected to be produced with gray scale mask photolithography, and the weight will have only one third of that of its refractive counterpart.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Cheng-Huan Chen, Yi-Chen Tsai, and Han-Ping David Shieh "Light-weight objective lens for DVD pickup", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005);


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