Optical pickup apparatus having improved holographic optical ele

Details Optical pickup apparatus having improved holographic optical ele Optical pickup apparatus having improved holographic optical ele

1999-08-24

2000-06-06

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356123, 369112, G01B 9021

Patent

active

060725796

ABSTRACT:
An optical pickup apparatus includes first and second light sources which selectively emit one of first and second light beams, the first and second light beams being different in wavelength, the wavelengths of the first and second light beams being appropriate for accessing first and second optical disks respectively. A coupling lens converts a corresponding one of the first and second light beams into a collimated beam. An objective lens forms a light spot on a corresponding one of the first and second optical disks by focusing the collimated beam. A holographic optical element receives a reflection beam of the light spot from one of the first and second optical disks and provides holographic effects on the reflection beam so as to diffract the reflection beam in predetermined diffracting directions depending on the wavelength of the reflection beam. A photodetector receives the reflection beam from the holographic optical element at light receiving areas and outputs signals indicative of respective intensities of the received reflection beam at the light receiving areas, so that a focusing error signal and a tracking error signal are generated based on the signals.

REFERENCES:
patent: 5986996 (1999-11-01), Kitamura et al.

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