Binary optical element for an optical disk read/write head

Details Binary optical element for an optical disk read/write head Binary optical element for an optical disk read/write head

1990-07-23

1992-08-04

Arnold, Bruce Y.

Optical: systems and elements

Compound lens system

Microscope

359572, 369 4423, G02B 530, G02B 518, G11B 712

Patent

active

051364247

ABSTRACT:
A ultra-compact optical readout device utilizing a binary optical element that provides a wide separation between diffraction efficiency peaks of different polarization modes so that sending and returning light can take distinct paths at the light source and detector, respectively, and also take the same paths at other regions of the device, enabling the simultaneous emission and detection of light for reading information from optical media. The specially designed contour of the binary optical diffracting element also provides the device with focussing capabilities without the need for a cylindrical lens at the detector or light source.

REFERENCES:
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4779943 (1988-10-01), Tatsuno et al.
patent: 4794585 (1988-12-01), Lee
patent: 4799210 (1989-01-01), Wilson et al.

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