Title:
光走査装置
Document Type and Number:
Japanese Patent JP4666563
Kind Code:
B2
Abstract:
An optical scanning device for scanning of a first, second and third type of optical record carrier with radiation of a first wavelength lambda1, a second wavelength lambda2 and a third wavelength lambda3, respectively, where the three wavelengths are substantially different. The device comprises: a radiation source for emitting a beam of said radiation, an objective system for converging the beam on a selected one of the optical record carriers, and a phase structure arranged in the path of the beam, the phase structure comprising a plurality of phase elements of different heights, forming a non-periodic stepped profile of optical paths in the beam, and is characterised in that the stepped profile substantially approximates a flat wavefront at the first wavelength lambda1, a spherical aberration wavefront at the second wavelength lambda2, and a flat or spherical aberration wavefront at the third wavelength lambda3.
Inventors:
Hendricks Bernardus HW
Devries Jolith Yi
Devries Jolith Yi
Application Number:
JP2002580320A
Publication Date:
April 06, 2011
Filing Date:
April 04, 2002
Export Citation:
Assignee:
Chuko Mark Co., Ltd.
International Classes:
G11B7/1374; G02B5/18; G02B13/00; G11B7/135; G11B7/1353; G11B7/00
Domestic Patent References:
| JP10055564A | ||||
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Foreign References:
| WO1999057720A1 | ||||
| EP1022731A1 | ||||
| EP0859356A1 | ||||
| EP0789355A1 |
Attorney, Agent or Firm:
Toshiro Ohata