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    • 2. 发明授权
    • Apparatus and method for automatic focusing of light using a fringe plate
    • 使用边缘板自动对焦光的装置和方法
    • US5338924A
    • 1994-08-16
    • US927959
    • 1992-08-11
    • William A. BarrettAmit Puri
    • William A. BarrettAmit Puri
    • G02B7/28G03F7/20G01J1/20
    • G03F7/70483G02B7/28G03F7/70375
    • The present invention provides an apparatus and method to automatically focus an incident beam of monochromatic parallel planar light on a work piece, using a fringe plate and a vision detector. The work piece may have a perfect mirror surface, or have a non-reflective patterned surface. The incident light beam is focused on the work piece and then reflected through a fringe plate forming an interference pattern on the vision detector. The incident light beam is then scanned or wobbled. The wobbling incident light beam forms a distinctively oscillating output signal from the vision detector when the light is focused on the work piece. When the light is not focused on the work piece a distinctive and more constant output signal is produced by the vision detector. For a given position of the work piece, by noting whether the output signal is rapidly changing or relatively constant, the invention can automatically determine whether or not the work piece is at the focal point of the incident light beam. This can be used to automatically focus the etching or writing laser on the chip or wafer in a laser etching system. The present invention can also be used to automatically determine the focal surface of an objective lens.
    • 本发明提供一种使用边缘板和视觉检测器将单色平行平面光的入射光束自动聚焦在工件上的装置和方法。 工件可以具有完美的镜面,或者具有非反射图案的表面。 入射光束聚焦在工件上,然后通过在视觉检测器上形成干涉图案的边缘板反射。 然后将入射光束扫描或摆动。 当光聚焦在工件上时,摆动入射光束从视觉检测器形成明显的振荡输出信号。 当光不集中在工件上时,视觉检测器产生一个独特和更恒定的输出信号。 对于工件的给定位置,通过注意输出信号是快速变化还是相对恒定,本发明可以自动确定工件是否在入射光束的焦点处。 这可以用于在激光蚀刻系统中自动将蚀刻或写入激光器聚焦在芯片或晶片上。 本发明也可用于自动确定物镜的焦面。