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,...

2004-11-12

2008-08-19

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C369S112010, C369S112230

Reexamination Certificate

active

07414796

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.

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