Optical pickup apparatus
AssigneeSanyo Electric Co., Ltd.
InventorsChiaki ASAKAWA, Mitsuhiro Hiruma
Life of this patent
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Abstract
In an optical pickup apparatus, a major part of an optical path of a laser beam emitted from a first semiconductor laser device and an optical path of a laser beam emitted from a second semiconductor laser device 3 are shared. The first laser beam is transmitted through a quarter wavelength plate and a second reflecting mirror and is reflected by a first reflecting mirror. With this structure, the number of parts of optical systems disposed in the optical pickup apparatus is reduced, an attachment operation of the parts becomes easier, and a time required for adjusting an optical axis is reduced. Thus, an operational efficiency is greatly improved.
Claims5
An optical pickup apparatus comprising:
- a first emitting element configured to emit a first laser beam having a first wavelength;
- a second emitting element configured to emit a second laser beam having a second wavelength different from the first wavelength;
- a first objective lens guiding the first laser beam to and from a first optical information recording medium;
- a second objective lens guiding the second laser beam to and from a second optical information recording medium;
- a first reflecting mirror directly sending the first laser beam to and receiving the first laser beam from the first objective lens;
- a second reflecting mirror directly sending the second layer beam to and receiving the second laser beam from the second objective lens;
- and
- a reflection film disposed on the first reflecting mirror,
- wherein the second reflecting mirror is configured to transmit the first laser beam so that the first laser beam is reflected by the first reflecting mirror and configured to reflect the second laser beam, and
- the reflection film is configured to cancel a phase difference generated in the first laser beam when the first laser beam is transmitted through the second reflecting mirror.
Dependencies are inferred from the claim text.