Optical head device that prevents the displacement of the optical axis caused by expansion or contraction due to temperature change
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United States of America Patent
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Aug 19, 2008
Grant Date -
Sep 23, 2004
app pub date -
Dec 19, 2003
filing date -
Dec 24, 2002
priority date (Note) -
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Abstract
An optical head device including a photo detector and an optical system which converges a laser beam emitted by a laser light source onto an optical recording medium and also guides a returning beam from the optical recording medium to the photo detector. The optical head device further includes a base on which the laser light and the photo detector are mounted. An optical element is mounted on the base via an optical element holder which has the same linear expansion coefficient as that of the base and is fixed with adhesive directly to the base. The optical element is fixed on a surface which is perpendicular to a device optical axis of the element holder.
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