| 摘要 |
Provided is an optical head device wherein light outputted from a light source is reflected by an information recording layer of an optical disc and guided to an optical detector. In an optical path from the optical disc to the optical detector, a light reducing element, which is provided with a first region having a high transmittance, a second region having a low transmittance and a third region having a medium transmittance between the high transmittance and the low transmittance, is arranged, and return light which is from a layer different from the information recording layer and causes crosstalk is reduced by the optical detector. |
