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
fDate :
3/1/1998 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
