LASER DRIVE DEVICE, OPTICAL HEAD, AND OPTICAL INFORMATION PROCESSOR

To provide a laser driving apparatus which is inexpensive and has high reliability in spite of using a plurality of light sources, since a multi - wavelength light source is required for treating different kinds of optical disks such as CD, DVD or the like. In a two - wavelength LD apparatus includi...

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Bibliographic Details
Main Authors KAMEI, TOMOTADA, KOMMA, YOSHIAKI, ITO, TATSUO, KADOWAKI, SHIN-ICHI, YAMAMOTO, HIROAKI
Format Patent
LanguageEnglish
French
German
Published 17.11.2010
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:To provide a laser driving apparatus which is inexpensive and has high reliability in spite of using a plurality of light sources, since a multi - wavelength light source is required for treating different kinds of optical disks such as CD, DVD or the like. In a two - wavelength LD apparatus including: a semiconductor laser 1a; a semiconductor laser 1b; and a photo detector 2, optical outputs of the semiconductor lasers 1a, 1b are controlled by APC circuits 6a, 6b on the basis of respective voltage values of variable resistors 4a, 4b connected in series to the photo detector 2. Alternatively, in the two - wavelength LD apparatus including: the semiconductor laser 1a; the semiconductor laser 1b; and the photo detector 2, the optical outputs of the semiconductor 1a, 1b are controlled by the APC circuits 6a, 6b on the basis of respective intermediate potentials of variable resistors 4a, 4b connected in parallel with the photo detector 2.
Bibliography:Application Number: EP20010904328