SCANNING TYPE PROJECTOR
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United States of America Patent
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Issued Date -
Nov 22, 2012
app pub date -
May 17, 2012
filing date -
May 20, 2011
priority date (Note) -
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Abstract
A scanning type projector for scanning an optical beam emitted from a laser light source has a collimator lens and a scanning device. A beam demagnifying and shaping prism is disposed between the collimator lens and the scanning device. The cross section of the beam that is elliptical is demagnified along the major axis of the ellipse such that the cross section of the beam is shaped. Thus, the cross section of the beam fits within the effective diameter of a deflecting mirror incorporated in the scanning device. The optical beam is reflected efficiently. A bright image can be projected. The resolution is improved by the beam shaping effect.
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