Abstract
We design an integrated optical pickup for small form factor optical disk drives. The specifications of the pickup are compatible with those of the Blu-ray disk (BD) in terms of numerical aperture (NA) of the objective lens, the wavelength of the laser diode, and the thickness of the cover layer. The objective lens unit with NA of 0.85 consists of two aspherical refractive lenses and a diffractive optical element for compensation of the chromatic aberration. Each element of objective lens unit will be fabricated on a wafer as an array type, and the three wafers will be aligned and bonded to form an objective lens array. Therefore, elements of the objective lens unit are designed to have sufficient alignment tolerances for various directions such as de-center and tilt. The optical performances of the objective lens unit are evaluated by simulation against various disturbances such as wavelength change of emitting light from laser diode, misalignments, etc. We also design a quarter wave plate, a polarized holographic optical element, and the shape of photodiode integrated circuit array to generate focusing and tracking error signals. The entire height of the pickup including working distance is 2 mm, and the effective pupil diameter of the objective lens unit is less than 1 mm.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
van der Aa MAH, van As MAJ, Braun AL, Hendriks BHW, Liedenbaum CTH, van Rompaey B, van Rosmalen GE, Schleipen JJHB, Borg HJ, Nijsse GJP, Nuijens PJ, van Aken NPDM, Jutte PT, Renckens JMG, van Steen RI, Bramwell S, Stavely P (2002) Small form factor optical drive: miniaturized plastic high-NA objective and optical drive. ISOM/ODS 2002, Technical Digest, pp 251–253
van der Aa MAH, Penning FC, Braun AL, Schleipen JJHB, Hendriks BHW, van As MAJ, Verberne HRM, Meftah M, Liedenbaum CTH, van Rosmalen GE, Biefhoff WXJ, Borg HJ, Stavely PA, Bramwell SD, Thomsom JA, Stark DMJ, van Gaal FMAM, van der Vleuten CANM, van Dorst FC, Adema CL (2003) Highly miniaturized prototype optical drive for use in portable device. Optical Data Storage Topical Meeting, Technical Digest, pp 2–4
Kim S-C, Kim Y-S, Lee S-H, Lee M-H, Kim J-Y (2003) Ultra small optical pick-up module. Optical Data Storage Topical Meeting, Technical Digest, pp 256–267
Kim W-C, Lee M-B, Sohn J-S, Cho E-H, Yoon C-Y, Park N-C, Park Y-P (2004) Fabrication of DOEs with gray scale photolithography. Optical Data Storage Topical Meeting, Technical Digest, pp 189–191
Manoh K, Yoshida H, Kobayashi T, Takase M, Ymauchi K, Fujiwara S, Ohno T, Nishi N, Ozawa M, Ikeda M, Tojyo T, Taniguchi T (2003) Small integrated optical head device using a blue–violet laser diode for Blu-ray disk system. Jpn J Appl Phys Part 1 42(2B):880–884
Acknowledgements
This work was funded by the Samsung Advanced Institute of Technology through Center for Information Storage Device at Yonsei University as a part of the project of “Super Slim Optical Pickup.”
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sohn, J.S., Lee, S.H., Jung, M.S. et al. Design of an integrated optical pickup with NA of 0.85 for small form factor optical disk drives. Microsyst Technol 11, 457–463 (2005). https://doi.org/10.1007/s00542-005-0593-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00542-005-0593-6