To provide an optical pick-up apparatus capable of performing recording or reproduction of information to three kinds of optical information recording mediums having specifications different from each other.
In the optical pick-up apparatus, reproduction and/or recording of information is performed to a first optical information recording medium having a first protective substrate having a thickness t1 using a luminous flux having a wavelength 1 from a first light source 1 and reproduction and/or recording of information is performed to a second and a third optical information recording mediums having second and third protective substrates having thicknesses t2 and t3 (t3t2t1), respectively, using luminous fluxes having wavelengths 2 and 3 (123) from second and third light sources 2 and 3, respectively. The optical pick-up apparatus uses a common objective lens 8 constituted of one lens group for reproduction and/or recording of information to the first to the third optical information recording mediums and has a substrate thickness difference correcting means 7 for correcting spherical aberration changing caused by thickness difference of the first to the third protective substrates.
SAKAMOTO KATSUYA
SHIN YUICHI
| JPH11134702A | 1999-05-21 | |||
| JP2001043559A | 2001-02-16 | |||
| JP2001195769A | 2001-07-19 | |||
| JP2001209966A | 2001-08-03 | |||
| JP2003067972A | 2003-03-07 | |||
| JPH11134702A | 1999-05-21 | |||
| JP2001043559A | 2001-02-16 | |||
| JP2001195769A | 2001-07-19 | |||
| JP2001209966A | 2001-08-03 | |||
| JP2003067972A | 2003-03-07 |
Kenichi Kobayashi