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US 10,650,856 B1Granted
Thermally-assisted magnetic recording head having optimal reflecting position inside waveguide
AssigneeSAE Magnetics (H.K.) Ltd.
InventorsRyo Hosoi, Seiichi Takayama
Life of this patent
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Abstract
A thermally assisted magnetic head including a slider and a light source-unit. The slider includes a slider substrate and a magnetic head part. The light source-unit includes a laser diode and a sub-mount. The magnetic head part includes a medium-opposing surface, a light source-opposing surface and a waveguide which guides laser light from the light source-opposing surface to the medium-opposing surface. The thermally assisted magnetic head includes an optimal-structure which the following optimizing conditional expression, concerning an inlet-optical path length L1 of an inlet-interval of the waveguide, and an outlet-optical path length L2 of an outlet-interval, is satisfied, m1×L1=L2 (m1 is a natural number).
Claims11
A thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which the following optimizing conditional expression, using an inlet-optical path length L1 of an inlet-interval of the waveguide from the light source-opposing surface to a reflecting-position of the laser light, and an outlet-optical path length L2 of an outlet-interval from the reflecting-position to the air bearing surface, is satisfied,
- m1×L1=L2 (m1 is a natural number).
5 more elements
A thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which the following optimizing conditional expression, using an inlet-optical path length L1 of an inlet-interval of the waveguide from the light source-opposing surface to a reflecting-position of the laser light, and a light-source optical path length L3 of an internal waveguide of the laser diode, is satisfied,
- m2×L1=L3 (m2 is a natural number).
5 more elements
A thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which the following optimizing conditional expression, using a light-source optical path length L3 of an internal waveguide of the laser diode and a waveguide-optical path length L4 of all interval along length direction of the waveguide, is satisfied,
- m3×L4=L3 (m3 is a natural number).
5 more elements
A thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which at least any two of the following the first, second, third optimizing conditional expressions, using an inlet-optical path length L1 of an inlet-interval of the waveguide from the light source-opposing surface to a reflecting-position of the laser light, an outlet-optical path length L2 of an outlet-interval from the reflecting-position to the air bearing surface, a light-source optical path length L3 of an internal waveguide of the laser diode and a waveguide-optical path length L4 of all interval along length direction of the waveguide, are satisfied,
- m1×L1=L2 (m1 is a natural number) first optimizing conditional expression
- m2×L1=L3 (m2 is a natural number) second optimizing conditional expression
- m3×L4=L3 (m3 is a natural number). third optimizing conditional expression
7 more elements
A head gimbal assembly comprising a thermally assisted magnetic head,
- wherein the thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which the following optimizing conditional expression, using an inlet-optical path length L1 of an inlet-interval of the waveguide from the light source-opposing surface to a reflecting-position of the laser light, and an outlet-optical path length L2 of an outlet-interval from the reflecting-position to the air bearing surface, is satisfied,
- m1×L1=L2 (m1 is a natural number).
6 more elements
A hard disk drive comprising a head gimbal assembly having a thermally assisted magnetic head, and a magnetic recording medium opposing the thermally assisted magnetic head,
- wherein the thermally assisted magnetic head comprising:
- a slider;
- and
- a light source-unit joined to the slider,
- wherein the slider comprises a slider substrate and a magnetic head part formed on the slider substrate,
- wherein the light source-unit comprises a laser diode and a sub-mount which the laser diode is joined;
- wherein the magnetic head part comprises an air bearing surface opposing a magnetic recording medium, a light source-opposing surface arranged rear side of the air bearing surface and a waveguide which guides laser light, output from the laser diode, from the light source-opposing surface to the air bearing surface,
- wherein the thermally assisted magnetic head comprises an optimal-structure which the following optimizing conditional expression, using an inlet-optical path length L1 of an inlet-interval of the waveguide from the light source-opposing surface to a reflecting-position of the laser light, and an outlet-optical path length L2 of an outlet-interval from the reflecting-position to the air bearing surface, is satisfied,
- m1×L1=L2 (m1 is a natural number).
6 more elements
Dependencies are inferred from the claim text.