Optical element and optical pickup device
AssigneeKonica Minolta Opto, Inc.
InventorsSetsuo Tokuhiro, Tatsuo Ohta
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Abstract
An optical element irradiated with a light flux having a wavelength of 350 nm to 450 nm, is provided with a synthetic resin base material; and an antireflection film provided on the synthetic resin base material and including a contact layer being in contact with the synthetic resin base material, wherein the contact layer is a film made of a material containing no oxygen atom or a film made of a mixed material or a material containing no oxygen atom and a material containing an oxygen atom in which the mixed material contains the material containing an oxygen atom less than 10%.
Claims7
An optical pickup apparatus, comprising:
- a light source to emit a laser light flux having a wavelength of 350 nm to 450 nm;
- and
- an optical element arranged at a position where the laser light flux having a wavelength of 350 nm to 450 nm passes through the optical element;
- wherein the optical pickup apparatus conducts recording and/or reproducing information by converging the laser light flux having passed through the optical element onto a information recording plane of an optical information recording medium, wherein the optical element comprises:
- a synthetic resin base member;
- and
- an antireflection film provided on the synthetic resin base member and including a contact layer being in contact with the synthetic resin base member, wherein the contact layer is a film made of a material containing no oxygen atom or a film made of a mixed material of a material containing no oxygen atom and a material containing an oxygen atom in which the mixed material contains the material containing an oxygen less than 10%,
- wherein the synthetic resin base member is a base member made of a resin containing a polymer including an alicyclic hydrocarbon group.
Dependencies are inferred from the claim text.