Title:
光ヘッド
Document Type and Number:
Japanese Patent JP4262978
Kind Code:
B2
Abstract:
A lens system includes a lens, a grating and a non-periodic phase structure. The lens system is a-thermalised by a compensation of the temperature-dependence of the spherical aberration of the lens by the temperature-dependence of the spherical aberration of the non-periodic phase structure and the grating. The lens system is also a-spherochromatised by a compensation of the wavelength-dependence of the spherical aberration of the grating by the wavelength-dependence of the spherical aberration of the non-periodic phase structure.
Inventors:
Hendricks, Bernardus Harway
Defleece, Yorit A
Defleece, Yorit A
Application Number:
JP2002543432A
Publication Date:
May 13, 2009
Filing Date:
November 15, 2001
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G11B7/1374; G02B5/18; G02B13/00; G11B7/135; G11B7/1353
Domestic Patent References:
| JP2000268392A | ||||
| JP11337818A | ||||
| JP10186230A | ||||
| JP10255305A | ||||
| JP11287948A |
Attorney, Agent or Firm:
Tadahiko Ito