Optical disk drive having a low-emission high-bandwidth laser driver
First Claim
1. An optical recording system having a light means for generating a light beam to write data to and read data from a storage medium, a modulating means for suppressing instabilities of said light means, and an apparatus for driving said light means, said apparatus comprising:
- a transistor coupled to said light means for supplying current to said light means;
a shielding means enclosing said modulating means and said transistor for containing radio frequency energy emitted from said modulating means;
an amplifier coupled to said transistor for driving a base of said transistor to control a power level of said light means.
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Accused Products
Abstract
An optical recording system having a laser for generating a light beam to write data to and read data from a storage medium, an RF modulator for modulating the laser to improve its stability, and an apparatus for driving the laser. The apparatus is comprised of a transistor coupled to the laser for supplying current to the laser. An amplifier is implemented to drive the base of the transistor according to a microprocessor. Thereby, the microprocessor effectively controls the power level of the laser. The transistor and the RF modulator are enclosed within shielding to contain the RF energy being generated by the modulator. In addition, the collector-base separation of the transistor reduces the RF energy being transmitted through the line driving the base of the transistor.
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Citations
14 Claims
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1. An optical recording system having a light means for generating a light beam to write data to and read data from a storage medium, a modulating means for suppressing instabilities of said light means, and an apparatus for driving said light means, said apparatus comprising:
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a transistor coupled to said light means for supplying current to said light means; a shielding means enclosing said modulating means and said transistor for containing radio frequency energy emitted from said modulating means; an amplifier coupled to said transistor for driving a base of said transistor to control a power level of said light means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of driving a laser in an optical data storage system having a laser for writing data to a storage means and for reading data stored on said storage means, a modulating means for modulating said laser to minimize instabilities of said laser, and a microprocessor for controlling a power level of said laser, comprising the steps of:
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driving a base of a transistor at a level according to said microprocessor; driving said laser by an output of said transistor, wherein said power level of said laser is determined by how hard said base of said transistor is driven; enclosing said modulating means and said transistor within a single shielding means, wherein said single shielding means simultaneously shields both said modulating means and said transistor. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification