Optical system for optical pickup apparatus

Details Optical system for optical pickup apparatus Optical system for optical pickup apparatus

2007-01-16

2007-01-16

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S126000, C359S719000

Reexamination Certificate

active

10692353

ABSTRACT:
An optical system has an expander lens and an objective lens. The following formula is satisfied: W1CM>W2CM, where W1CMis a coma aberration (λrms) of a converged light spot when an off-axial light flux of a wavelength λ (nm) emitted so as to converge at a distance position from the optical axis comes into the objective lens, and W2CMis a coma aberration (λrms) of a converged spot when an off-axial light flux of the wavelength λ (nm) emitted so as to converge at the distant position distant comes through the expander lens into the objective lens on a condition that the optical axis of the expander lens is arranged so as to conform with the optical axis of the objective lens.

REFERENCES:
patent: 4770517 (1988-09-01), Sakuma
patent: 6791934 (2004-09-01), Shimano et al.
patent: 6876501 (2005-04-01), Kimura et al.
patent: 7046450 (2006-05-01), Hirata

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