Optical pickup apparatus and optical element

Details Optical pickup apparatus and optical element Optical pickup apparatus and optical element

2003-08-29

2009-08-18

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112120, C369S112030

Reexamination Certificate

active

07577077

ABSTRACT:
An optical pickup apparatus comprises first, second and third light sources to emit light fluxes of wavelength λ1, λ2and λ3for conducting recording and/or reproducing information for first, second and third optical information recording mediums having respective protective substrates of thickness t1, t2and t3and a diffractive optical element located on a common optical path for the first, second and third light sources. A converged-light spot is formed on the first optical information recording medium with m-th order diffracted-light ray of the wavelength λ1, on the second optical information recording medium with n-th order diffracted-light ray of the wavelength λ2, and on the third optical information recording medium with k-th order diffracted-light ray of the wavelength λ3generated by the diffractive optical element respectively, wherein one of m, n and k is different from one of other two numbers.

REFERENCES:
patent: 6545823 (2003-04-01), Kitahara
patent: 6594222 (2003-07-01), Maruyama
patent: 6807019 (2004-10-01), Takeuchi et al.
patent: 6834036 (2004-12-01), Shiono et al.
patent: 6870805 (2005-03-01), Arai et al.
Kim, Nam-Hyong. “How Diffractive Surfaces are Modeled in Zemax.” Zemax Users's Knowledge Base (Sep. 23, 2005) p. 1.

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