Light source driving apparatus and system utilizing the same
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United States of America Patent
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Jan 25, 1994
Grant Date -
N/A
app pub date -
Jun 24, 1991
filing date -
Jun 26, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A driving apparatus for a light source is provided with a light generating unit including a light source which emits a light component polarized in a first predetermined direction and another light component polarized in a second, perpendicular direction. The first and second light components are emitted in amounts which vary depending on the total emitted light output. A light splitter is provided for splitting the two polarized components in different splitting ratios into first and second light paths. A photodetector detects the light intensity in the first light path, and a control unit controls the light generating unit so as to maintain the light intensity in the second light path at a predetermined state based on the detection output of the photodetector.
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