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1. 发明申请

WO0016147A9 VARIABLE FOCUS OPTICAL SYSTEM 审中-公开
标题翻译：可变焦点光学系统
公开(公告)号：WO0016147A9
公开(公告)日：2000-08-17
申请号：PCT/US9921178
申请日：1999-09-13
申请人： POLAROID CORP
发明人： FANTONE STEPHEN D , FIGARELLA LUIS A , IMRIE DAVID A , MCKINLEY HARRY , PLUMMER WILLIAM T , STERN HOWARD , VAN TASSELL JON E
IPC分类号： G02B7/02 , G02B7/04 , G02B7/08 , G02B7/09 , G02B7/105 , G02B7/28 , G02B13/14 , G02B15/06 , G02B26/08 , G06K7/10
CPC分类号： G02B26/0875 , G02B7/04 , G06K7/10811
摘要： A variable focus optical system is particularly suitable for use in acquiring digital images for subsequent processing in a hand held, omnidirectional symbology or bar code reader (12) by which linear and two dimensional (matrix, maxi-code) bar codes (28; 34; 40; 52; 54) may be imaged over relatively long working distances. The imaging system includes a focusing objective taking lens (92) and a two-dimensional photodetector (93) that operate to form an image of an object such as a bar code in X and Y directions simultaneously and generates an electrical signal representative of the object or code for subsequent downstream processing. Focusing is achieved via a rotating disk (94) that carries a plurality of optical shims (130) or other light controlling surfaces to provide for different focus zones. A through-the-lens (TTL) targeting system is provided to visually assist the user in positioning the system for a variety of objects to assure that an object will be captured within the field of view and be sharply imaged on the photodetector (93) when the lens (92) is focused. Two different forms of artificial illumination are provided to accommodate nearby objects that may be either specular or partially diffuse and more distant objects where the reflection characteristics have less impact on image contrast. Ranging through the lens (92) using elements of the photodetector (93) is included to provide information to set the focus of the objective lens (92) in one of many possible focusing zones.
摘要翻译：可变焦点光学系统特别适用于获取数字图像以供手持式全向符号体系或条形码阅读器（12）中的后续处理，线性和二维（矩阵，最大码）条形码（28; 34 ; 40; 52; 54）可以在相对较长的工作距离上成像。成像系统包括用于同时在X和Y方向上形成诸如条形码之类的对象的图像的聚焦物镜摄像镜头（92）和二维光电检测器（93），并且生成表示物体的电信号或用于后续下游处理的代码。通过承载多个光学垫片（130）或其他光控制表面以提供不同聚焦区域的旋转盘（94）实现聚焦。提供透过镜头（TTL）瞄准系统以视觉上帮助用户为各种物体定位系统，以确保物体将被捕获在视场内并在光检测器（93）上被清晰地成像，当透镜（92）被聚焦时。提供两种不同形式的人工照明以适应可能是镜面反射或部分漫射的附近物体，以及反射特性对图像对比度影响较小的较远物体。包括使用光电探测器（93）的元件测量透镜（92）以提供信息以将物镜（92）的焦点设置在许多可能的聚焦区域之一中。

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