| 摘要 |
An optical information recording-reproduction apparatus comprises: a light source; an objective lens and a SIL (solid immersion lens) for focusing a light beam from the light source on an optical recording medium; an aperture element for collecting a part of the light beam reflected by an optical recording medium, corresponding to the effective aperture number of the objective lens and SIL of less than 1; a detecting element for detecting the part of the light beam from the aperture element corresponding to the effective aperture number of less than 1; a speed-generating circuit for reducing the speed of approach of the SIL to the recording medium in accordance with the level of the signal detected by the detecting element; and a driver circuit for driving the objective lens and the SIL in accordance with output from the speed-generating circuit.
|
