Light weight objective lens for DVD pickup

Cheng-Huan Chen*, Yi Chen Tsai, Han Ping David Shieh

*Corresponding author for this work

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

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.

Original languageEnglish
Article number85
Pages (from-to)481-488
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5638
Issue numberPART 1
DOIs
StatePublished - 14 Jun 2005
EventOptical Design and Testing II - Beijing, United States
Duration: 8 Nov 200411 Nov 2004

Keywords

  • Diffractive optical element
  • DVD pickup
  • Objective lens

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