Back to results
US 5,311,495 AGranted
Optical system for converging light beams to form a single beam spot on an optical disc
AssigneeKabushiki Kaisha Toshiba
InventorHideo Ando
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKabushiki Kaisha Toshiba
InventorHideo Ando
Estimating the term…
In an optical system for converging light beams to form a single beam spot on an optical disc, a light beam generated from a semiconductor laser is collimated by a collimator lens and is guided to a prism member. In the prism member, the light beam is divided into two segment beams having same intensity distributions which are similar to that of the generated light beam by a polarization beam splitting face. One of the segment beams is reflected to an objective lens and the other of the segment beams is guided to a wave surface changing member. Which change the configuration or distribution of the other segment beam. The other segment beam having a deformed intensity distribution is also guided to the objective lens from the changing member and is combined with the one segment beam to form the single beam spot on the disc.
An optical system for combining and converging light beams on an information recording medium, comprising:
An optical system for combining and converging light beams on an information recording medium, comprising:
Dependencies are inferred from the claim text.