Pickup module with coating layer
AssigneeASUSTeK COMPUTER INC.
InventorYen-Chih Lee
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Abstract
A pickup module comprises a plurality of optical components along an optical path, wherein at least two of the optical components are provided with coating layers to change a polarization of a light beam and collectively circularly polarize the light beam. The circularly-polarized beam is projected on an optical storage medium and converted to a signal beam received by an optical detector. A quarter wavelength plate (QWP) or the other phase retarded plate for required purpose (½λ, ¼λ, ⅛λ . . . ) is not included in the optical component set.
Claims14
A pickup module, comprising:
- a plurality of optical components along an optical path;
- wherein at least two of the optical components are provided with coating layers changing a polarization of a light beam and collectively generating a circularly polarized beam projected on an optical storage medium and converted to a signal beam received by an optical detector, and a quarter wavelength plate is excluded from the optical component set.
A method of fabricating a pickup module comprising a plurality of optical components, excluding a quarter wavelength plate, comprising:
- coating a first coating layer on a first optical component of the optical component set;
- coating a second coating layer on a second optical component of the optical component set;
- and
- coating an nth coating layer on an nth optical component;
- wherein the first, second and nth coating layers collectively convert a non-circularly polarized light beam to a circularly polarized light beam projected on an optical storage medium and converted to a signal beam received by an optical detector.
Dependencies are inferred from the claim text.