초록 ▼

The invention relates to a method of producing a reproduction of an object and an apparatus for carrying out said method. A particular object of the invention is the reproduction of the remaining stump of an amputated leg (18) for producing an improved prosthetic socket. When carrying out the method

The invention relates to a method of producing a reproduction of an object and an apparatus for carrying out said method. A particular object of the invention is the reproduction of the remaining stump of an amputated leg (18) for producing an improved prosthetic socket. When carrying out the method, the object (18) is positioned in a predetermined position in relation to a rotatable framework (8) on which a laser apparatus (12) and a video camera (13) are mounted in such positions that they can illuminate, and pick up, respectively, the image of a contour line (17) of the object via a pair of mirrors (15, 16; 20, 21) each during the rotation of the framework (8) through substantially a complete revolution. The image thus obtained of the contour line (17) is converted through a video/AD-converter (26) into numerical information identifying coordinates of points on the line. This information is supplied together with measuring and control programs to a computer (27), the output signals of which are supplied as input signals to a control electronic unit. The output signals from the electronic units control a model milling cutter in such a way that this on a workpiece produces a contour line which corresponds to a modified form of the contour lines of the object. The framework (8) with laser apparatus (12) and video camera (13) is intermittently rotated stepwise a predetermined fraction of a revolution, and for each step the abovementioned measures are repeated until the framework has been rotated through a complete revolution.

대표청구항 ▼

Method of producing a modified, three-dimensional reproduction of a soft, elastically deformable object, characterized by the following measures: (a) positioning the object in a predetermined position in respect of a rotatable framework on which a laser apparatus and a video camera are mounted to il

Method of producing a modified, three-dimensional reproduction of a soft, elastically deformable object, characterized by the following measures: (a) positioning the object in a predetermined position in respect of a rotatable framework on which a laser apparatus and a video camera are mounted to illuminate and receive, respectively, the image of a contour line of the object, via at least one mirror each, when the framework is rotated through one complete revolution; (b) intermittently rotating said framework stepwise to produce an analog signal based on the image recorded by said video camera for each step; (c) converting the image of the contour line thus obtained at each step through a video/AD-converter into numerical information identifying coordinates of points on the contour line; (d) supplying said numerical information together with measuring and control programs to a computer, preferably having a graphical terminal; (e) modifying said numerical information supplied to the computer according to the measuring program as modified according to a CAD program in agreement with a calculated deformation of the object on account of a precalculated load; (f) applying the output signals from the computer as input signals to a control electronic unit; (g) controlling by said control electronic unit a model manufacturing machine having tool in such a way that said tool on a work-piece produces a contour line which conforms to the modified contour line of the object for each step; (h) continuing said intermittent rotation of the framework including laser apparatus and video camera stepwise through a predetermined fraction of a revolution until the framework has been rotated through at least almost one complete revolution; and (i) intermittently rotating the model workpiece stepwise in relation to the tool of the model manufacturing machine in the same way as the framework, is rotated in relation to the object, for producing a modified reproduction of the object.