An optical pickup unit is disclosed which comprises: an objective lens that focuses laser light on an optical disc; a lens holder that holds the objective lens; a coil that is fitted on the lens holder and capable of driving the lens holder; and a heat transfer improving member that is fitted on the holder to cause heat to be radiated, wherein the heat is generated in the coil when the coil is energized.

 
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< Image projecting device and method

> Laser focus controlling method on an optical disk and an optical disk apparatus with using thereof

> Optical head and optical disk device capable of detecting spherical aberration

~ 00619