| 摘要 |
A contactless distance measuring probe of the kind used, inter alia, in so-called coordinate measuring machines, and comprises a lens system having an objective and a light source arranged to transmit light onto a point on a measurement object through the lens system, wherein the lens system is intended to focus this point on the measurement object and wherein the measurement probe includes a focus detecting means which is intended to receive light arriving from the aforementioned point subsequent to passing through the lens system, and is intended to detect when the transmitted light is focused on the surface of said object. The invention is characterized in that the light source (40) and the focus detecting means (15) are included in a detector unit (61); in that an optical unit (81, 82) which is small and light in weight in relation to the lens system (7) is arranged for movement in a direction towards and away from the objective (8) of the lens system, the unit thereby functioning to change the distance of the focus point from the objective; and in that a measuring means (16), such as a scale, is provided for measuring the position of the movable optical unit (81; 82) in relation to the lens system (7) when the focus detecting means (15) detects that the transmitted light is focused on the surface of the measurement object, this position constituting a measurement of the distance (c) between the aforementioned point (13) on the measurement object and the objective (8). |
