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US 6,958,968 B2Granted
Optical head with GRIN lens
AssigneeSamsung Electronics Co., Ltd.
InventorsMyung-bok Lee, Petrov Nikolai, Gi-myung Woo
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Abstract
An optical head in which a graded index (GRIN) lens is provided. The optical head includes a slider connected to an arm and flying a predetermined distance above a recording layer for data recording, a GRIN lens mounted in the slider for focusing an incident beam to form a light spot of a predetermined size on its exit surface adjacent to the recording layer, and a light-emitting unit for emitting the incident light to the GRIN lens.
Claims20
An optical head comprising:
- a slider adapted to fly a predetermined distance above a recording layer for data recording;
- a graded index (GRIN) lens mounted on the slider for focusing an incident beam of light to form an exit light spot of a predetermined size on an exit surface of the GRIN lens;
- and
- a light-emitting unit for emitting the incident beam of light to the GRIN lens;
- wherein the exit surface is not covered by a layer that limits light emission through the GRIN lens from the incident beam of light;
- and
- wherein the GRIN lens forms the exit light spot of the predetermined size on the exit surface by multistage focusing.
4 more elements
An optical head, comprising:
- a slider, adapted to fly a predetermined distance above a recording layer, for data recording;
- a graded index (GRIN) lens mounted on the slider for focusing an incident beam of light to form an exit light spot of a predetermined size on an exit surface of the GRIN lens, the GRIN lens comprising:
- a first GRIN lens, fixed in a hole of the slider and having a gradient-index parameter ω1 that radially varies, and
- a second GRIN lens, protruding from a bottom center region of the first GRIN lens, such that the second GRIN lens is coplanar with the bottom surface of the slider and having a gradient-index parameter ω2 that varies radially,
- where ω1<ω2;
- a light-emitting unit for emitting the incident beam of light to the GRIN lens;
- wherein the exit surface of is not covered by a layer that limits light emission through the GRIN lens from the incident light;
- wherein the second GRIN lens has one of a shape that tapers toward the recording layer and a cylindrical shape with a constant diameter;
- and
- wherein the second GRIN lens includes a plurality of stacked GRIN lenses respectively having (1) diameters that decrease toward the recording layer and (2) gradient-index parameters that increase toward the recording layer.
7 more elements
Dependencies are inferred from the claim text.