Light-emission and reception module for optical pickup and optical pickup
AssigneeMitsumi Electric Co., Ltd.
InventorsTsuyoshi Ishii, Tsukasa Yamada, Soumei Takahashi, Akihiro Yoshizawa
Life of this patent
Estimating the term…
Abstract
In a light-emission and reception module for use in an optical pickup, a polarization beam splitter transmits an outgoing laser beam from the laser-emitting element and reflects, as a reflected laser beam, a return laser beam reflected by the optical disc in a direction perpendicular to the outgoing laser beam. The laser-emitting element, the polarization beam splitter, and the photo-detecting element are mounted on the holder. The reflected laser beam is perpendicular to a reception surface of the photo-detecting element.
Claims17
A light-emission and reception module for use in an optical pickup, said light-emission and reception module comprising:
- a laser-emitting element for emitting an outgoing laser beam to irradiate an optical disc with the outgoing laser beam;
- a polarization beam splitter for transmitting the outgoing laser beam and for reflecting, as a reflected laser beam, a return laser beam reflected by the optical disc;
- a photo-detecting element for photo-detecting the reflected laser beam;
- and
- a holder for mounting thereon said laser-emitting element, said polarization beam splitter, and said photo-detecting element;
- said laser-emitting element, said polarization beam splitter, and said photo-detecting element being mounted on said holder so that the reflected laser beam is perpendicular to a reception surface of said photo-detecting element.
An optical pickup comprising a light-emission and reception module and an optical base;
- said light-emission and reception module comprising:
- a laser-emitting element for emitting an outgoing laser beam to irradiate an optical disc with the outgoing laser beam;
- a polarization beam splitter for transmitting the outgoing laser beam and for reflecting, as a reflected laser beam, a return laser beam reflected by the optical disc;
- a photo-detecting element for photo-detecting the reflected laser beam;
- and
- a holder for mounting thereon said laser-emitting element, said polarization beam splitter, and said photo-detecting element;
- said laser-emitting element, said polarization beam splitter, and said photo-detecting element being mounted on said holder so that the reflected laser beam is perpendicular to a reception surface of said photo-detecting element;
- said light-emission and reception module being mounted on said optical base so that an optical axis of the return laser beam is coincident with an incident optical axis of said polarization beam splitter.
Dependencies are inferred from the claim text.