Three laser optical disk drive system
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United States of America Patent
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May 12, 1992
Grant Date -
N/A
app pub date -
Dec 12, 1989
filing date -
Dec 12, 1989
priority date (Note) -
Expired
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Abstract
An erasable optical disk drive system is disclosed which utilizes an electron trapping media coated on the disk surface to store data in the form of light energy and which utilizes three laser beams, each having a wavelength range distinct from each other as well as distinct from the wavelength range of the emission produced by the impingement of the read laser onto the electron trapping media. Data is written onto the disk, which is contained in a light-tight contamination-free environment, using a visible light laser beam. Data is read from the disk and the disk is erased by using a near infrared light laser beam. The focus and tracking functions of the disk drive system are accomplished by using a laser beam having yet another range of wavelengths, which are greater than those of the visible light laser beam and those of the photon emission from the electron trapping optical memory media, but less than those of the read/erase laser.
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