Title:
OPTICAL LENS, CONDENSING LENS, OPTICAL PICKUP, AND OPTICAL RECORDING&sol REPRODUCING DEVICE
Document Type and Number:
WIPO Patent Application WO/2003/034417
Kind Code:
A1
Abstract:
An optical lens having a high refractive index and low light absorbing characteristics in a ultraviolet wavelength region, a condensing lens suitably used for a near field optical recording&sol reproducing system, an optical pickup capable of reducing a condensing spot applied to a recording medium and accommodating a higher recording density and a larger capacity, and an optical recording&sol reproducing device provided with this optical pickup and capable of optical recording&sol reproducing at a high recording density. The optical lens is constituted by using optical materials selected from HfO2, HfO2−Y2O3, HfO2−TiO2, HfO2−Sc2O3, HfO2−Nd2O3, HfO2−Ln2O3, Sc2O3, MgO, Y2O3, WO3, Gd2O3, Eu2O3, Dy2O3.
Inventors:
SHINODA MASATAKA (JP)
Application Number:
PCT/JP2002/010559
Publication Date:
April 24, 2003
Filing Date:
October 10, 2002
Export Citation:
Assignee:
SONY CORP (JP)
SHINODA MASATAKA (JP)
SHINODA MASATAKA (JP)
International Classes:
G02B7/02; G02B13/14; G11B7/135; G11B7/125; G11B11/105; (IPC1-7): G11B7/135; G02B13/00; G02B13/14; G02B1/02
Foreign References:
| JPH11273126A | 1999-10-08 | |||
| JPH10260349A | 1998-09-29 | |||
| JP2002055201A | 2002-02-20 |
Attorney, Agent or Firm:
Tsunoda, Yoshisue (8-1 Nishishinjuku 1-chome Shinjuku-ku, Tokyo, JP)
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