Pickup apparatus for multi-layer optical disc

Details Pickup apparatus for multi-layer optical disc Pickup apparatus for multi-layer optical disc

2007-02-08

2009-11-17

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07619958

ABSTRACT:
An optical pickup apparatus comprises an orbicular zone forming lens group14for forming the section of the laser beam, which is irradiated to an optical disc DK having plural recording layers, into an annular shape, a condenser lens35that converges the reflected beam from the optical disc DK, and a pinhole plate36having formed thereto a pinhole36awith a size corresponding to a flux diameter of the reflected beam converged by the condenser lens35. The orbicular zone forming lens group14refracts the laser beam irradiated to the optical disc DK so as to form the section of the laser beam into an annular shape in order that the internal diameter of the annular converged flux formed on the pinhole plate36aby the reflected beam from the recording layers other than the recording layer having an optical spot formed thereon becomes greater than the diameter of the pinhole36a.

REFERENCES:
patent: 7227704 (2007-06-01), Koike
patent: 5-182200 (1993-07-01), None
patent: 2004-355791 (2004-12-01), None

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