Diffraction type optical pickup lens and optical pickup...

Details Diffraction type optical pickup lens and optical pickup... Diffraction type optical pickup lens and optical pickup...

2006-07-04

2006-07-04

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080, C369S044230

Reexamination Certificate

active

07072272

ABSTRACT:
In a diffraction type optical pickup lens, at least one surface of a convergent lens is formed with such an aspheric surface that a luminous flux having a wavelength λ1is converged at a first predetermined position. At least one surface of the convergent lens is formed with a zone plate having such a wavelength selectivity that a luminous flux having a wavelength λ2is converged at a second predetermined position whereas the luminous flux having a wavelength λ1is transmitted therethrough as it is. The convergent lens is transparent to the luminous fluxes having the wavelengths λ1and λ2.

REFERENCES:
patent: 6088322 (2000-07-01), Broome et al.
patent: 6429972 (2002-08-01), Ota et al.
patent: 2000-081566 (2000-03-01), None
patent: 2001-272516 (2001-10-01), None
patent: 2001-272517 (2001-10-01), None

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