Magneto-optical disc reproducing apparatus with improved two-part head
AssigneeNikon Corporation
InventorKatsumi Mizunoe
Life of this patent
Estimating the term…
Abstract
A reproducing apparatus for magneto-optical discs has a moving head portion and a fixed head portion. Light reflected from the disc is divided into two parallel light beam components having different planes of polarization. These light beam components are transmitted to corresponding light intensity detectors of the fixed head portion. The outputs of the detectors are unaffected by movement of the movable head portion relative to the fixed head portion radially of the disc and are unaffected by movement of the movable head portion in other directions due to inaccuracies in the slider mechanism that moves the movable head portion radially.
Claims10
A reproducing apparatus for reproducing a signal recorded on a magneto-optical disc, comprising:
- a first head portion;
- a fixed second head portion;
- said first head portion being movable in one direction relative to said disc and relative to said second head portion;
- means disposed on said first head portion for producing a linearly polarized light beam;
- an optical system disposed on said first head portion for directing said light beam to said magneto-optical disc;
- optical means disposed on said first head portion for dividing light reflected by said magneto-optical disc into two components having different planes of polarization and for directing said two components to said second head portion;
- first light intensity detecting means disposed on said second head portion for detecting the intensity of light of one of said two components;
- and
- said light intensity detecting means disposed on said second head portion for detecting the intensity of light of the other of said two components.
A reproducing apparatus for reproducing a signal recorded on a magneto-optical disc, comprising:
- a first head portion;
- a fixed second head portion;
- said first head portion being movable in one direction relative to said disc and relative to said second head portion;
- means disposed on said first head portion for producing a linearly polarized light beam;
- an optical system disposed on said first head portion for directing said light beam to said magneto-optical disc;
- optical means disposed on said first head portion for extracting a component having a predetermined plane of polarization from light reflected from said magneto-optical disc and for directing said extracted component to said second head portion;
- and
- means disposed on said second head portion for detecting the intensity of light of said component extracted by said optical means.
Dependencies are inferred from the claim text.