Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A magneto-optical recording and reproducing device comprising an optical head provided with a laser beam source, focusing a laser beam spot onto a magneto-optical recording medium with a magnetic substance film of perpendicular magnetic anisotropy, a magnetic coil generating an alternating magnetic field according to data to be recorded, and forming positive magnetized parts being magnetized in a predetermined direction, and negative magnetized parts being magnetized in the opposite direction of said positive magnetized parts on said magnetic substance film of said recording medium, recording and reproducing data by existence or absence of said negative magnetized parts, characterized in that there is provided a laser beam output level control means controlling intensity of said laser beam at forming said positive magnetized parts more strongly than forming said negative magnetized parts, so that the width of said positive magnetized parts becomes wider than said negative magnetized parts.
Claim 2
Dependent Claim
34 words
A magneto-optical recording and reproducing device according to claim 1, wherein said laser beam output level control means is arranged to be equipped in a laser beam driver which drives said laser beam source.
Claim 3
Dependent Claim
84 words
A magneto-optical recording and reproducing device according to claim 1, wherein said laser beam output level control means is arranged to be equipped in said laser beam driver which drives said laser beam source and is also arranged to control the width of said positive magnetized parts to be wider than the width of said negative magnetized parts when data is to be recorded, by inputting data to be recorded in said magneto-optical recording medium to said laser beam driver from a data generator.
Claim 4
Dependent Claim
44 words
A magneto-optical recording medium applied to a magneto-optical recording and reproducing device according to claim 1 is arranged to comprise a substrate, a magnetic substance film of magnetic anisotropy on said substrate rear side, and a protective film which covers said magnetic substance film.
Claim 5
Dependent Claim
79 words
A magneto-optical recording and reproducing device according to claim 1, wherein said optical head comprise a laser beam source which emits a laser beam, condensing lens which focuses laser beam spot onto a magnetic substance film of said magneto-optical recording medium by condensing the laser beam, a beam splitter which changes the advancing direction of a reflected light from said magneto-optical recording medium, and a photodetector which detects intensity et cetera of the reflected light through said beam splitter.
Claim 6
Dependent Claim
189 words
A magneto-optical recording and reproducing device comprising a data generator which outputs data to be record ed to a magneto-optical recording medium, a magnetic coil driver which outputs modulated control signals according to data output from said data generator, a magnetic coil generating an alternating magnetic field driven by the control signals from said magnetic coil driver, and optical head which focuses a laser beam onto said magneto-optical recording medium, and a laser driver which drives a laser beam source of the optical head, characterized in that there is provided a laser beam output level control means controlling intensity of said laser beam at forming said positive magnetized parts on said magnetic substance film of the magneto-optical recording medium, which is formed being magnetized in the predetermined direction, more strongly than forming said negative magnetized parts, which is formed being magnetized in the opposite direction of said positive magnetized parts, so that the width of said positive magnetized parts becomes wider than said negative magnetized parts when data is to be recorded in the magneto-optical recording medium after inputting data output from said data generator to said laser driver.
Claim 7
Dependent Claim
45 words
A magneto-optical recording medium applied to a magneto-optical recording and reproducing device according to claim 6 is arranged to comprise a substrate, a magnetic substance film of magnetic anisotropy on said substrate rear side, and a protective film which covers said magnetic sub stance film.
Claim 8
Dependent Claim
78 words
A magneto-optical recording and reproducing device according to claim 6, wherein said optical head comprise a laser beam source which emits a laser beam, condensing lens which focuses laser beam onto a magnetic substance film of said magneto-optical recording medium by condensing the laser beam, a beam splitter which changes the advancing direction of a reflected light from said magneto-optical recording medium, and a photodetector which detects intensity et cetera of the reflected light through said beam splitter.
Claim 9
Dependent Claim
116 words
A magneto-optical recording device for recording digital information along a track on a magneto-optical recording medium having perpendicular magnetic anisotropy by controlling the direction of perpendicular magnetization along the track so as to create so-called positive and negative track portions according to the recording information, the identity of a track portion as a said negative or positive track portion being determined by the presence or absence, respectively, of a given magnetization direction, wherein means is provided for controlling the power of a laser beam incident on the recording medium during recording so that said power is greater, and the beam thus is wider, when creating said positive track portions than when creating said negative track portions.
Claim 10
Dependent Claim
59 words
A magneto-optical recording apparatus in which the writing laser beam which is used in conjunction with a data-controlled magnetic field is more powerful, and thus wider, when creating track parts of a magnetic polarity opposite that of which the presence or absence at any given track point determines whether that track point is a so-called positive or negative part.