Invention Grant
US07889220B2 Device and method for maintaining optical energy density on a medium 失效
在介质上保持光能密度的装置和方法

Device and method for maintaining optical energy density on a medium
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.
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