A NOVEL DUAL FOCUS OBJECTIVE LENS FOR DVD CD PICK-UP HEAD/

Authors
LIU PY SHIEH HPD JU JJ TSAI ST YANG TM CHANG TK LIU JS
Citation
Py. Liu et al., A NOVEL DUAL FOCUS OBJECTIVE LENS FOR DVD CD PICK-UP HEAD/, IEEE transactions on magnetics, 34(2), 1998, pp. 462-464
Citations number
4
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
Journal title
IEEE transactions on magnetics → ACNP
ISSN journal
00189464
Volume
34
Issue
2
Year of publication
1998
Part
1
Pages
462 - 464
Database
ISI
SICI code
0018-9464(1998)34:2<462:ANDFOL>2.0.ZU;2-X
Abstract
A new dual focus objective lens of combinig aspherical surfaces of DVD and CD for DVD/CD pick-up head was designed. Numerical analysis based on the diffraction model were studied to trade off the spot size, sid e lobe, and energy ratio of DVD and CD, The hybrid aspherical surfaces of DVD and CD are optimized for low aberration. The spot size of full wave half maximum (FWHM) are 0.553 and 0.88 mu m for DVD and CD, resp ectively, measured from thus constructed double rings lens.