DocumentCode
1362505
Title
A novel dual focus objective lens for DVD/CD pick-up head
Author
Liu, Pei-Yih ; Shieh, Han-Ping D. ; Ju, Jau-Jiu ; Tsai, Shin-Ter ; Yang, Tsung-Mng ; Chang, Tsung-Kai ; Liu, Jiin-Song
Author_Institution
Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Volume
34
Issue
2
fYear
1998
fDate
3/1/1998 12:00:00 AM
Firstpage
462
Lastpage
464
Abstract
A new dual focus objective lens of combining 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, side 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 μm for DVD and CD, respectively, measured from thus constructed double rings lens
Keywords
aberrations; aspherical optics; lenses; optical disc storage; pick-ups; DVD/CD pick-up head; FWHM; aberration; diffraction model; double ring lens; dual focus objective lens; energy ratio; hybrid aspherical surface; numerical analysis; side lobe; spot size; Brain modeling; DVD; Diffraction; Lenses; Magnetic heads; Numerical analysis; Optical design; Optical surface waves; Size measurement; Wavelength measurement;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.667792
Filename
667792
Link To Document