Optical head apparatus
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United States of America Patent
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May 13, 2008
Grant Date -
Jan 27, 2005
app pub date -
May 20, 2004
filing date -
May 22, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention proposes an optical head apparatus provided with light-blocking structure that can reliably prevent nonessential light from reaching the photo detector, without being an impediment to miniaturization and flattening, moreover, without increasing manufacturing cost. In an optical head apparatus, and in a lens holder, light-blocking section is provided that blocks nonessential light from passing outside the effective diameter of objective lens. This light-blocking section is constructed so that it extends only in tracking direction T of objective lens 5. Further, light-blocking face of light-blocking section slants at an angle of 1.degree. or more toward the face orthogonal to the optical axis, consequently, nonessential light is reflected in a direction other than the direction of photo detector.
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