Method of determining the shape of a dental technology object and apparatus for per-forming the method
First Claim
1. Method for a non-contact, three-dimensional determination of the shape of a dental technical technology object, such as a positive model (10) or a section of it, whereby, to determine the spatial coordinates of surface points of the object to be measured, a strip of light projected onto the object is measured by at least two matrix cameras (32, 34) to determine two coordinates (Z-, Y-coordinate) of a coordinate system, and a third co-ordinate-co-ordinate) is determined by capturing the position of the object arranged on a measuring table (18), which can rotate around a rotational axis (20), characterized in that the matrix camera (32, 34) is a color matrix camera with first, second and third pixels, that light is detected by the matrix camera in a wave length range substantially characteristic for one type of the pixels (first pixels), and values of at least one of the other types of the pixels (second and third pixels) are analyzed to determine the two first coordinates (Y- and Z-coordinates).
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Accused Products
Abstract
The invention relates to a method and an apparatus for a non-contact, three-dimensional determination of the shape of a dental technology object (10) whereby, to determine the space coordinates of the object'"'"'s surface points to be measured, a thin stripe of light projected onto the object is measured by at least two matrix cameras (32, 34) to determine two space coordinates (Z- Y-coordinate) of a coordinate system, and the third space coordinate (X coordinate) is ascertained by determining the position of the object arranged on a measuring table (22) which is rotatable about an axis of rotation (20). For allowing, in an easy manner, a non-contact determination of the shape of the dental technology object, whereby the constructive effort to determine the spatial coordinates is kept low and the shape acquisition should still be performed highly precisely and at high speed, it is provided that the matrix camera is a color matrix camera with first, second and third pixels, that the matrix camera captures light in a range of wave lengths characteristic for one type of the pixels (first pixels) and the values at least of one of the other types of the pixels (second and third pixels) are analyzed to determine the two first location coordinates (Y- and Z-coordinates).
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Citations
23 Claims
- 1. Method for a non-contact, three-dimensional determination of the shape of a dental technical technology object, such as a positive model (10) or a section of it, whereby, to determine the spatial coordinates of surface points of the object to be measured, a strip of light projected onto the object is measured by at least two matrix cameras (32, 34) to determine two coordinates (Z-, Y-coordinate) of a coordinate system, and a third co-ordinate-co-ordinate) is determined by capturing the position of the object arranged on a measuring table (18), which can rotate around a rotational axis (20), characterized in that the matrix camera (32, 34) is a color matrix camera with first, second and third pixels, that light is detected by the matrix camera in a wave length range substantially characteristic for one type of the pixels (first pixels), and values of at least one of the other types of the pixels (second and third pixels) are analyzed to determine the two first coordinates (Y- and Z-coordinates).
- 14. Apparatus for the non-contact, three-dimensional determination of shape of a dental technology object (10), such as a positive model or a section thereof, with a measuring table (18) receiving the dental technology object and rotatable about an axis of rotation (20), a light-generating apparatus (36), such as a laser apparatus, for imaging a line of light onto the dental technology object, two matrix cameras (32, 34) oriented towards the light line, and an analysis unit (45) analyzing signals from the matrix cameras to determine co-ordinates of the light line, characterized in that the matrix cameras (32, 34) are color cameras, whereby the matrix cameras are exposed to light in a wave-length range which is characteristic for one type of the pixels, and that the loading values of a second type of the pixels, which are different from the first type of the pixels, can be analyzed to measure the light line.
Specification