Optical information recording or playbacking system, optical hea

Details Optical information recording or playbacking system, optical hea Optical information recording or playbacking system, optical hea

1997-04-16

1999-07-13

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, G11B 700

Patent

active

059236353

ABSTRACT:
An optical disk apparatus is provided that is capable of recording and playback of optical disks such as CDs having different substrate thicknesses. Light exiting a laser light source is passed through a parallel flat plate and focused by an optical lens as a minute spot onto the recording surface at the rear side of the plate. The head apparatus has a hologram element having a grating pattern formed by interference between two spherical wavefronts, the lens system being configured so that a minimum spot size is formed when the 0th order transmitted light of the hologram element passes through a parallel flat plate having a first thickness, and so that a minimum spot is formed when 1st order diffracted light of the hologram element passes through a parallel flat plate of a second thickness; fabrication of the hologram element grating being facilitated by the simplicity of the pattern thereof.

REFERENCES:
patent: 5231620 (1993-07-01), Ohuchida

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