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    • 41. 发明授权
    • Quadrilateral mesh generation method and apparatus
    • 四边网格生成方法和装置
    • US6121973A
    • 2000-09-19
    • US132886
    • 1998-08-12
    • Takayuki ItohTomotake FuruhataKenji Shimada
    • Takayuki ItohTomotake FuruhataKenji Shimada
    • G06F17/50G06T17/20G06F15/00
    • G06T17/20
    • A method and appatatus for generating a quadrilateral mesh comprising a plurality of quadrilateral elements from a triangular mesh comprising a plurality of triangular elements by performing the following operations: for each candidate quadrilateral element comprising a pair of adjacent triangular elements (also referred to as a pair of adjacent triangular elements in embodiments), calculating a first evaluation value which represents a relationship between the candidate quadrilateral element and an alignment direction of quadrilateral elements specified by a user and a second evaluation value which relates to the shape of the candidate quadrilateral element; and selecting, by using the first and the second evaluation values, a candidate quadrilateral element to be used as an element of the quadrilateral mesh among the candidate quadrilateral elements. It is possible to further include a step of calculating, for each candidate quadrilateral element, a third evaluation value which takes a first value when there is no other triangular element to make a pair with any triangular element comprising a candidate quadrilateral element and takes a second value when there is one. As a result, in the aforementioned selecting step may give higher priority in the selection to a candidate quadrilateral element whose third evaluation value takes the first value.
    • 一种用于通过执行以下操作从包括多个三角形元素的三角形网格生成包括多个四边形元素的四边形网格的方法和应用:对于包括一对相邻三角形元素(也称为对)的每个候选四边形元素 计算表示候选四边形元素与用户指定的四边形元素的排列方向和与候选四边形元素的形状有关的第二评估值之间的关系的第一评估值; 以及通过使用第一和第二评估值来选择要用作候选四边形元素之中的四边形网格的元素的候选四边形元素。 可以进一步包括对于每个候选四边形元素计算第三评估值的步骤,当没有其他三角形元素与包括候选四边形元素的任何三角形元素形成一对时,获取第一值,并且取第二值 有价值时有一个。 结果,在上述选择步骤中,在对第三评估值取第一值的候选四边形元素的选择中可以给出较高的优先级。
    • 43. 发明授权
    • Compact wide-angle zoom lens
    • 紧凑型广角变焦镜头
    • US4726665A
    • 1988-02-23
    • US853243
    • 1986-04-17
    • Takayuki Itoh
    • Takayuki Itoh
    • G02B13/04G02B13/18G02B15/16G02B15/163G02B15/177G02B9/64
    • G02B15/177
    • A compact wide-angle zoom lens comprising, in order from the object side, a variator that consists of a first lens component having a negative focal length and a second lens component having a positive focal length, and a single-element fixed third lens component (relay lens system) that is positioned subsequent to the variator for increasing its focal length. The first lens component has a negative-positive lens unit arrangement. The second lens component has a positive-negative-positive lens unit arrangement. The first and second lens component are mechanically moved so as to provide a variable focal length and maintain a constant focal position. The following conditions are satisfied: ##EQU1## where f.sub.1 : the focal length of the first lens component;f.sub.2 : the focal length of the second lens component;f.sub.L : the focal length of the overall system for the narrow-angle position; andm.sub.3 : the lateral magnification of the third lens component.
    • 一种紧凑的广角变焦透镜,其从物体侧起按顺序包括由具有负焦距的第一透镜部件和具有正焦距的第二透镜部件组成的变倍器和单个元件固定的第三透镜部件 (中继透镜系统),其位于变频器之后,以增加其焦距。 第一透镜部件具有负正透镜单元布置。 第二透镜部件具有正 - 负 - 正透镜单元布置。 机械地移动第一和第二透镜部件以便提供可变的焦距并保持恒定的焦点位置。 满足以下条件:(1)(2)和1.0
    • 44. 发明授权
    • Telephoto macro lens system
    • 长焦微距镜头系统
    • US4666260A
    • 1987-05-19
    • US801992
    • 1985-11-25
    • Takayuki Itoh
    • Takayuki Itoh
    • G02B13/02G02B9/64
    • G02B13/02
    • A telephoto macro lens system includes, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length. The first lens group is composed of a first subgroup (1a) including a positive lens group and a negative meniscus lens and a second subgroup (1b) including a negative lens having a divergent surface on the object side. The second lens group is composed of a third subgroup (2a) having a large negative refractive power and a positive unitary lens (2b) spaced from the third subgroup. The lens system is so constructed as to satisfy the following conditions:(1) 1.0
    • 长焦微距透镜系统从物体侧依次包括具有正焦距的第一透镜组和具有负焦距的第二透镜组。 第一透镜组由包括正透镜组和负弯月形透镜的第一子组(1a)和包括在物体侧具有发散表面的负透镜的第二子组(1b)组成。 第二透镜组由具有大的负折光力的第三子组(2a)和与第三子组间隔开的正整体透镜(2b)组成。 透镜系统构造满足以下条件:(1)1.0
    • 47. 发明授权
    • Compact telephoto zoom lens
    • 紧凑型长焦变焦镜头
    • US4395092A
    • 1983-07-26
    • US240421
    • 1981-03-04
    • Takayuki Itoh
    • Takayuki Itoh
    • G02B15/167G02B15/173G02B15/14
    • G02B15/173
    • A compact telephoto zoom lens is composed of twelve lenses grouped into nine lens groups. These include, from the object side, a variator system including a first lens group functioning as a focusing group having a positive focal length, a second lens group functioning as a main variator having a negative focal length, a third lens group functioning as a compensator for maintaining an image plane constant which has a positive focal length, and a relay lens system. The first lens group includes a positive meniscus lens convex on the object side and a positive cemented lens composed of a negative meniscus lens convex on the object side and a positive lens. The second lens group includes a negative lens whose lens concave surfaces confront one another and a negative cemented lens composed of a biconcave and a positive lens. The third lens group includes a positive cemented lens composed of a biconvex lens and a negative meniscus lens while the relay lens system includes first and second fourth lens groups.
    • 紧凑型长焦变焦镜头由分为9个镜头组的12个镜头组成。 这些包括从物体侧开始的变换器系统,其包括用作具有正焦距的聚焦组的第一透镜组,用作具有负焦距的主变焦器的第二透镜组,用作补偿器的第三透镜组 用于保持具有正焦距的图像平面常数和中继透镜系统。 第一透镜组包括在物体侧凸起的正弯月形透镜和由物体侧凸起的负弯月形透镜和正透镜构成的正粘结透镜。 第二透镜组包括透镜凹面相对的负透镜和由双凹面和正透镜构成的负胶合透镜。 第三透镜组包括由双凸透镜和负凹凸透镜构成的正胶合透镜,而中继透镜系统包括第一和第二第四透镜组。