Complex objective lens, optical head, optical information...

Details Complex objective lens, optical head, optical information... Complex objective lens, optical head, optical information...

2011-03-22

2011-03-22

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112070, C369S112120, C359S566000, C359S571000

Reexamination Certificate

active

07911923

ABSTRACT:
A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base thickness of about 0.6 mm for a red light beam (wavelength λ2). In an inner circumferential portion of the hologram, a grating is formed, which has a cross-sectional shape including as one period a step of heights in the order of 0 time, twice, once, and three times a unit level difference that gives a difference in optical path of about one wavelength with respect to a blue light beam, from an outer peripheral side to an optical axis side. The hologram transmits a blue light beam as 0th-order diffracted light without diffracting it, and disperses a red light beam passing through an inner circumferential portion as +1st-order diffracted light and allows it to be condensed by an objective lens. Because of this, the focal length of the red light beam becomes longer than that of the blue light beam, whereby a working distance is enlarged.

REFERENCES:
patent: 4246338 (1981-01-01), Kaplan
patent: 4936665 (1990-06-01), Whitney
patent: 5017000 (1991-05-01), Cohen
patent: 5073007 (1991-12-01), Kedmi et al.
patent: 5111448 (1992-05-01), Komma et al.
patent: 5122903 (1992-06-01), Aoyama et al.
patent: 5177349 (1993-01-01), Setani
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5400311 (1995-03-01), Komma et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5513164 (1996-04-01), Tanaka et al.
patent: 6084843 (2000-07-01), Abe et al.
patent: 6118594 (2000-09-01), Maruyama
patent: 6166854 (2000-12-01), Katsuma
patent: 6201780 (2001-03-01), Katayama
patent: 6442124 (2002-08-01), Chung et al.
patent: 6449095 (2002-09-01), Ohtaki et al.
patent: 6515805 (2003-02-01), Hagimori
patent: 6552990 (2003-04-01), Kajiyama et al.
patent: 6728193 (2004-04-01), Uchizaki et al.
patent: 6760295 (2004-07-01), Maruyama
patent: 6834036 (2004-12-01), Shiono et al.
patent: 6898168 (2005-05-01), Kimura et al.
patent: 6927375 (2005-08-01), Yamamoto et al.
patent: 6928035 (2005-08-01), Komma et al.
patent: 6992967 (2006-01-01), Jeong
patent: 7035191 (2006-04-01), Yoo et al.
patent: 7079471 (2006-07-01), Chung et al.
patent: 7190650 (2007-03-01), Fujiune et al.
patent: 7433290 (2008-10-01), Komma
patent: 7609607 (2009-10-01), Kim
patent: 2001/0000135 (2001-04-01), Mori et al.
patent: 2002/0012313 (2002-01-01), Kimura et al.
patent: 2003/0072246 (2003-04-01), Nishiwaki et al.
patent: 2003/0095334 (2003-05-01), Kim et al.
patent: 2003/0151996 (2003-08-01), Hendriks
patent: 2003/0227858 (2003-12-01), Komma
patent: 2004/0090901 (2004-05-01), Katayama
patent: 2004/0109242 (2004-06-01), Komma
patent: 2004/0170106 (2004-09-01), Komma
patent: 2005/0152036 (2005-07-01), Shiono et al.
patent: 2007/0263517 (2007-11-01), Komma
patent: 0 610 055 (1994-08-01), None
patent: 0 731 459 (1996-09-01), None
patent: 0 747 893 (1996-12-01), None
patent: 0 831 466 (1998-03-01), None
patent: 0 936 604 (1999-08-01), None
patent: 1 001 414 (2000-05-01), None
patent: 1 167 311 (2002-02-01), None
patent: 1 202 259 (2002-02-01), None
patent: 1 500 956 (2005-01-01), None
patent: 7-98431 (1995-04-01), None
patent: 9-306018 (1997-11-01), None
patent: 10-106016 (1998-04-01), None
patent: 10-334504 (1998-12-01), None
patent: 11-023819 (1999-01-01), None
patent: 11-296890 (1999-10-01), None
patent: 11-339307 (1999-12-01), None
patent: 2000-306258 (2000-02-01), None
patent: 2000-081566 (2000-03-01), None
patent: 2000-260056 (2000-09-01), None
patent: 2001-006203 (2001-01-01), None
patent: 2001-043559 (2001-02-01), None
patent: 2001-060336 (2001-03-01), None
patent: 2001-209966 (2001-08-01), None
patent: 2002-237078 (2002-08-01), None
patent: WO 02/21522 (2002-03-01), None
patent: WO 02/082437 (2002-10-01), None
patent: WO 03/060891 (2003-07-01), None
Katayama, et al. “Blue/DVD/CD Compatible Optical Head with Three Wavelengths and a Wavelength Selective Filter”, International Symposium on Optical Memory 2001, Session We-C-04, pp. 30-31.
Nishioka, et al. “BD/DVD/CD Compatible Optical Pick-up Technology”, Extend Abstracts (The 50thSpring Meeting 2003); The Japan Society of Applied Physics and Related Societies, 27 p-ZW-10, Kanagawa University, Mar. 2003.
Kaiho, et al. “DVD/CD Compatibility using Blu-ray Disc Pick-up”, Extended Abstracts (The 63rdAutumn Meeting 2002); The Japan Society of Applied Physics, No. 3, Sep. 2002, 27-p-YD-5, pp. 1008 (and partial translation).
Katayama, et al. Dual Wavelength Optical Head for 0.6mm and 1.2mm Substrate Thickness:, Jpn. J. Appl. Phys., vol. 36 (1997) pp. 460-466.

Affiliated with

Also associated with

Rating

Complex objective lens, optical head, optical information... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Complex objective lens, optical head, optical information..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Complex objective lens, optical head, optical information... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2700169