Method and apparatus for correcting focus in an optical recording system
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United States of America Patent
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May 4, 1993
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N/A
app pub date -
Aug 23, 1991
filing date -
Feb 5, 1988
priority date (Note) -
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Abstract
An optical recording system. The system is directed towards optical recording media which is responsive to at least two wavelengths of light such as an erase beam and a record beam. Light of a lower wavelength is produced by a divergent light source such as a diode and only partially collimated in a collimating lens. When the record and erase beams pass through a common objective for focusing on the recording media, the slightly divergent lower wavelength beam is focused at the same location as the fully collimated higher wavelength beam.
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