OPTICAL HEAD AND INFORMATION REPRODUCING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To make it possible to execute recording and reproducing, etc., at a recording density higher than the recording density determined by a diffraction threshold and to suppress the heat generation in microapertures, the deformation accompanying the same, etc. SOLUTION: The optical head having the constitution to make the light from a light source 101 incident on a slider formed of a translucent material via an optical path 102 has light shielding means 104a to 104c which are disposed on the circumference of this slider and shield the light exclusive of evanescent light. The coefficient of thermal expansion of the material constituting the slider is set below the coefficient of thermal expansion of the material constituting these light shielding means.