Optical pickup

Details Optical pickup Optical pickup

2006-12-12

2006-12-12

Huber, Paul W. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112280

Reexamination Certificate

active

07149174

ABSTRACT:
An optical pickup which appropriately detects reflected light and return light reflected back from an information recording medium even if a laser light B1emitted from a light source varies in wavelength. The transmittances of a half mirror to the laser light B1emitted from the light source, and to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium are preset according to a predetermined condition, i.e., Tpc(λc)/Tp(λ)=(1−Ts(λ)/(1−Tsc(λc))×(Tsc(λc)/Ts(λ)). Here, λ is a predetermined wavelength emitted from a semiconductor laser as the light source, Ts(λ) is a transmittance to the laser light B1with a predetermined polarization, Tp(λ) is a transmittance to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium when the laser light B1with the predetermined wavelength λ is emitted, Tsc(λc) is a transmittance to the laser light B1with a wavelength λc when the semiconductor laser varies in wavelength characteristic, and Tpc(λc) is a transmittance to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium when the laser light B1with the wavelength λc is emitted.

REFERENCES:
patent: 5383175 (1995-01-01), Finkelstein et al.
patent: 6026070 (2000-02-01), Miura et al.
patent: 6556533 (2003-04-01), Fukakusa et al.

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