Konica Minolta Opto, Inc.

Mika Wachi

Kiyono Ikenaka

Katsuya Sakamoto

An optical pickup apparatus which conducts reproducing and/or recording information for a first optical information recording medium by using a light flux having a wavelength &#x3bb;(350&#x2266;&#x3bb;(nm)&#x2266;480) and a second optical information recording medium. The optical pickup apparatus comprises an output angle conversion element which is a fixedly arranged single lens which can convert an output angle of the first light flux and the second light flux. The optical detector equipped in the optical pickup apparatus can receive both of the first light flux and the second light flux. And, both optical surfaces of the output angle conversion element are refractive surfaces.

Optical pickup apparatus and optical information recording and/or reproducing apparatus

A converging optical element for use in an optical pickup apparatus reproducing and/or recording information on a first optical disc using a first light flux with a wavelength &#x3bb;emitted by a first light source, reproducing and/or recording information on a second optical disc using a second light flux with a wavelength &#x3bb;emitted by a second light source, and reproducing and/or recording information on a third optical disc using a third light flux with a wavelength &#x3bb;emitted by a third light source, the converting optical element includes: a phase structure arranged on at least one surface of the converging optical element, wherein when fis a focal length of the converging optical element for the third light flux, the focal length fsatisfies a predefined condition.

Converging optical element and optical pickup apparatus

An optical pickup device includes a light source emitting a light beam having a wavelength within a range of 390 nm to 420 nm and an optical element to perform recording and/or reproducing of information of an optical disk having a protective substrate thickness dmm using the first light beam from the first light source, wherein the optical element is made of a mixed material produced by dispersing particles into a resin, a sign of a refractive index change &#x394;n/&#x394;t of the particles owing to a temperature change is opposite to a sign of a refractive index change &#x394;n/&#x394;t of the resin owing to a temperature change, or an absolute value of the refractive index change &#x394;n/&#x394;t is smaller than an absolute value of the refractive index change &#x394;n/&#x394;t.

Growing community of inventors

Hino, Japan

Mika Wachi