Objective lens design method, lens, and optical system,...

Details Objective lens design method, lens, and optical system,... Objective lens design method, lens, and optical system,...

2008-07-18

2010-06-08

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C369S112010, C369S112230

Reexamination Certificate

active

07733578

ABSTRACT:
When the DVD provided with the DVD substrate2having thickness t2of 0.6 mm is installed in the optical disc apparatus, the light beam4having wavelength λ1=655 nm is used as luminous flux of numerical aperture NA=0.63 to be condensed on the information surface2aon the DVD substrate2. When the CD provided with the CD substrate3having thickness t2of 1.2 mm is installed in the optical disc apparatus, the light beam5having wavelength λ2=790 nm is effectively used as luminous flux of approximate numerical aperture NA=0.45 to be condensed on the information surface3aon the DVD substrate3. The wavefront aberration caused by a thickness difference between the DVD substrate2and CD substrate3is canceled out by the chromatic aberration caused by a wavelength difference between the light beams4and5. Therefore, in spite of the difference in the transparent substrates, the light beams are suitably condensed respectively on the information surface2aand3a.

REFERENCES:
patent: 6118594 (2000-09-01), Maruyama
patent: 6285646 (2001-09-01), Yoo et al.
patent: 6563780 (2003-05-01), Kim et al.
patent: 6678096 (2004-01-01), Sugi et al.
patent: 6785215 (2004-08-01), Yamanouchi et al.
patent: 6836378 (2004-12-01), Sugi et al.
patent: 7414796 (2008-08-01), Sugi et al.
patent: 2001/0036141 (2001-11-01), Kim et al.
patent: 2003/0095334 (2003-05-01), Kim et al.
patent: 2004/0036972 (2004-02-01), Kimura et al.
patent: 1351337 (2002-05-01), None
patent: 1365013 (2002-08-01), None
patent: A 9-145995 (1997-06-01), None
patent: A 2000-81566 (2000-03-01), None
patent: A 2001-51192 (2001-02-01), None

Affiliated with

Also associated with

Rating

Objective lens design method, lens, and optical system,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Objective lens design method, lens, and optical system,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Objective lens design method, lens, and optical system,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4242543