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1. 发明授权

US4901252A Method for producing planar geometric projection images 失效
标题翻译：平面几何投影图像的制作方法
公开(公告)号：US4901252A
公开(公告)日：1990-02-13
申请号：US100686
申请日：1987-09-24
申请人： William J. Fitzgerald , Franklin Gracer , Robert N. Wolfe
发明人： William J. Fitzgerald , Franklin Gracer , Robert N. Wolfe
IPC分类号： G06T15/40
CPC分类号： G06T15/40
摘要： The lines representing each edge of each face of each object of a model for producing a multiple object image are segmented at line of sight intersections with other lines representing contour edges of visible faces. Each resulting edge line segment is checked against all visible faces to determine which are visible and which are invisible, and information on visibility is stored together with detailed information on each edge line segment for each object. The model is modified by changing the number of component objects and after each change checking the edge line segments for visibility only with respect to the changes associated with the changed component objects. This results in a substantial reduction in the required number of comparisons between segments and faces as compared to prior methods.
摘要翻译：表示用于产生多个物体图像的模型的每个物体的每个面的每个边缘的每条边线的线在与可见面的轮廓边缘的其它线的视线相交线处被分割。针对所有可见面检查每个产生的边缘线段，以确定哪些是可见的，哪些是不可见的，并且关于可见性的信息与每个对象的每个边缘线段上的详细信息一起存储。通过更改组件对象的数量并在每次更改之后，根据与更改的组件对象相关联的更改来检查边缘线段以便可见性来修改模型。与以前的方法相比，这导致了段和面之间所需的比较数量的显着减少。

2. 发明授权

US06189130B1 System and method for determining density maps in hierarchical designs 失效
标题翻译：用于确定分层设计中密度图的系统和方法
公开(公告)号：US06189130B1
公开(公告)日：2001-02-13
申请号：US09070482
申请日：1998-04-30
申请人： Emanuel Gofman , Franklin Gracer , Ehud Dov Karnin , Mark A. Lavin , Dov Ramm
发明人： Emanuel Gofman , Franklin Gracer , Ehud Dov Karnin , Mark A. Lavin , Dov Ramm
IPC分类号： G06F1546
CPC分类号： G06F17/5081
摘要： A method for calculating density maps in hierarchical designs includes the steps of deoverlapping objects in the design, providing an area of interest in the design, generating a grid in the area of interest to partition the area of interest into grid elements, determining whether the local properties of each object within the grid elements have been previously calculated, if previously calculated, adding the previously calculated value for the local properties to a corresponding grid element, otherwise, calculating the local properties of the object and summing the local properties of the objects for each associated grid element such that the local properties are calculated only once for a given object throughout the design. A system is also includes for implementing the method.
摘要翻译：用于计算分级设计中的密度图的方法包括以下步骤：在设计中去重叠对象，在设计中提供感兴趣的区域，在感兴趣的区域中生成网格以将感兴趣的区域划分为网格元素，确定本地以前已经计算了网格元素中每个对象的属性，如果先前已计算，则将以前计算的本地属性值添加到对应的网格元素，否则，计算对象的本地属性并对对象的本地属性求和每个关联的网格元素，使得在整个设计中对于给定对象仅计算一次本地属性。还包括实现该方法的系统。

3. 发明授权

US5402351A Model generation system having closed-loop extrusion nozzle positioning 失效
标题翻译：具有闭环挤出喷嘴定位的模型生成系统
公开(公告)号：US5402351A
公开(公告)日：1995-03-28
申请号：US183512
申请日：1994-01-18
申请人： John S. Batchelder , Huntington W. Curtis , Douglas S. Goodman , Franklin Gracer , Robert R. Jackson , George M. Koppelman , John D. Mackay
发明人： John S. Batchelder , Huntington W. Curtis , Douglas S. Goodman , Franklin Gracer , Robert R. Jackson , George M. Koppelman , John D. Mackay
IPC分类号： B29C41/36 , B29C67/00 , G05B19/4099 , G06F17/50 , G06F15/46
CPC分类号： B29C67/0055 , B29C41/36 , B29C47/0866 , B29C67/0092 , G05B19/4099 , B29C47/0019 , G05B2219/37572 , G05B2219/49015 , Y02P90/265
摘要： Disclosed are methods and apparatus for fabricating a three-dimensional object in accordance with a computer-generated definition of the object that is stored within a memory. A method includes the steps of (a) evaluating the stored definition of the object to locate any un-supported features of the object; in response to locating an un-supported feature, (b) defining a support structure for the un-supported feature; (c) generating a fabrication tool movement list expressive of movements required by a fabrication tool to fabricate the object and any defined support structures; and (d) translating the fabrication tool in accordance with the generated fabrication tool movement list to fabricate the object and any defined support structures. The step of translating includes the steps of, generating a feedback signal that is indicative of at least one characteristic of a most recently fabricated portion of the object; and monitoring the feedback signal to detect a deviation of at least a location of the most recently fabricated portion of the object from a corresponding location as expressed in the associated portion of the fabrication tool movement list. Also disclosed are methods and apparatus for anti-aliasing aliased surface features of the object, representing the object definition in a vector format, generating a bit-mapped representation of the object, and an analysis of the definition of the object to identify and subsequently compensate for a region of the object that has a potential to retain heat during fabrication.
摘要翻译：公开了根据计算机生成的存储在存储器内的对象的定义来制造三维物体的方法和装置。一种方法包括以下步骤：（a）评估存储的对象的定义以定位对象的任何不支持的特征; 响应于定位未支撑的特征，（b）为所述不支持的特征定义支撑结构; （c）产生制造工具运动列表，其表达制造工具所需的运动以制造物体和任何限定的支撑结构; 以及（d）根据生成的制造工具移动列表翻译制造工具以制造物体和任何定义的支撑结构。转换步骤包括以下步骤：产生指示物体的最近制造的部分的至少一个特征的反馈信号; 以及监视所述反馈信号以检测所述物体的最近制造的部分的至少一个位置与所述制造工具运动列表的相关联部分中表示的对应位置的偏差。还公开了用于消除对象的混叠表面特征的方法和装置，以矢量格式表示对象定义，生成对象的位映射表示，以及对对象的定义的分析以识别和随后的补偿对于在制造期间具有保持热量的潜力的物体的区域。

4. 发明授权

US5303141A Model generation system having closed-loop extrusion nozzle positioning 失效
标题翻译：具有闭环挤出喷嘴定位的模型生成系统
公开(公告)号：US5303141A
公开(公告)日：1994-04-12
申请号：US34180
申请日：1993-03-22
申请人： John S. Batchelder , Huntington W. Curtis , Douglas S. Goodman , Franklin Gracer , Robert R. Jackson , George M. Koppelman , John D. Mackay
发明人： John S. Batchelder , Huntington W. Curtis , Douglas S. Goodman , Franklin Gracer , Robert R. Jackson , George M. Koppelman , John D. Mackay
IPC分类号： B29C41/36 , B29C67/00 , G05B19/4099 , G06F17/50 , G06F15/46
CPC分类号： B29C67/0055 , B29C41/36 , B29C47/0866 , B29C67/0092 , G05B19/4099 , B29C47/0019 , G05B2219/37572 , G05B2219/49015 , Y02P90/265
摘要： Apparatus and method for fabricating a three-dimensional object in accordance with a CAD-generated specification of the object. A closed-loop extrusion system (10) includes a nozzle (12) for extruding a material, such as a hot melt adhesive; apparatus (14, 18, 46) for controllably positioning the nozzle in accordance with the specification; and a sensor (60) for generating a feedback signal that is indicative of at least one characteristic of a most recently extruded portion of the material. Visual and non-visual feedback sensors may be employed, including optical sensors, infrared emission sensors, and proximity detection sensors. The specification of the object is converted to a bit-mapped representation thereof to improve accuracy relative to vector-based representations. Methods for determining a need for supporting structures and anti-aliasing features and for integrating the structures and features into the object specification are also disclosed.
摘要翻译：根据CAD生成的对象规范制造三维物体的装置和方法。闭环挤出系统（10）包括用于挤出材料的喷嘴（12），例如热熔粘合剂; 用于根据说明书可控地定位喷嘴的装置（14,18,46）; 以及用于产生指示材料的最近挤出部分的至少一个特性的反馈信号的传感器（60）。可以采用视觉和非视觉反馈传感器，包括光学传感器，红外发射传感器和接近检测传感器。将对象的规范转换为其位映射表示，以提高相对于基于矢量的表示的精度。还公开了用于确定对支撑结构和抗混叠特征的需求以及用于将结构和特征集成到对象规范中的方法。

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