Device and method for maintaining optical energy density on a medium
AssigneeHewlett-Packard Development Company, L.P.
InventorsAndrew L. Van Brocklin, Kuohua (Angus) Wu
Life of this patent
Estimating the term…
Abstract
A system and method are provided for maintaining optical energy density on a defined area of a medium markable by optical energy. The method includes the operation of directing a light beam from a light source to an optical system. The light beam can pass through at least one optical component in the optical system, where the optical system has astigmatic properties selected to maintain desired irradiance within the defined area of the medium through a range of working distances between the optical system and the defined area. A further operation is guiding the light beam by the optical system onto the marking area of the medium.
Claims23
A method of maintaining optical energy density on a defined area of a medium markable by optical energy, comprising:
- directing a light beam from a light source to an optical system having an objective lens that is fixed to at least one degree of freedom;
- passing the light beam through at least one optical component in the optical system, where the optical system has astigmatic properties selected to maintain a desired irradiance within the defined area through at least a 600 μm range of working distances between the optical system and the defined area;
- and
- guiding the light beam by the optical system onto the defined area.
A device for maintaining optical energy density on a marking area of a medium markable by optical energy, comprising:
- a light source configured to emit a light beam from the light source to an optical system;
- the optical system configured to guide the light beam onto the marking area;
- where the optical system comprises at least one optical component in the optical system through which the light beam is passed, the at least one optical component including a toric lens and an aspheric lens;
- and
- where the at least optical component has astigmatic properties that maintain a desired optical energy density on the marking area through at least a 600 μm range of working distances between the optical system and the marking area.
A device for maintaining optical energy density on a marking area of a medium markable by optical energy, comprising:
- a light source configured to emit a light beam from the light source to an optical system;
- the optical system configured to guide the light beam onto the marking area;
- where the optical system comprises at least one optical component in the optical system through which the light beam is passed and a fixed objective lens configured to guide the light beam onto the marking area of the medium as the light beam is received from the at least one optical component;
- and
- where the at least optical component has astigmatic properties that maintain a desired optical energy density on the marking area through at least a 600 μm range of working distances between the optical system and the marking area.
A device for maintaining optical energy density on a marking area of a medium markable by optical energy, comprising:
- a light source configured to emit a light beam from the light source to an optical system;
- the optical system configured to guide the light beam onto the marking area;
- where the optical system comprises at least one optical component in the optical system through which the light beam is passed;
- where the at least optical component has astigmatic properties that maintain a desired optical energy density on the marking area through at least a 600 μm range of working distances between the optical system and the marking area;
- and
- wherein the light source and the objective lens are fixed within the device.
A method of maintaining optical energy density on a marking area of an optical disk, comprising:
- directing a light beam from a light source to an optical system;
- passing the light beam from the light source through an optical component in the optical system having astigmatic properties that maintain a desired irradiance within a track on the optical disk at a working distance between the optical system and the optical disk that has a tolerance of at least +/−300 μm;
- and
- guiding the light beam by the optical system onto a track of the optical disk using an objective lens fixed with respect to the optical system.
Dependencies are inferred from the claim text.