MEASUREMENT DEVICE

• Main Authors: NAKAO TSUTOMU, TAKEMURA SHOTA
• Format: Patent
• Language: English; Japanese
• Published: 18.11.2021
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

To correct calibration data to an appropriate value without interrupting a width measurement even when an optical layout changes in a measurement device measuring a width of an object to be measured, and to suppress a measurement error.SOLUTION: A measurement device comprises: a light source; a line sensor that is arranged on an opposite side of the light source across a pass line where an object to be measured passes when conveyed, and that photographs the object to be measured in a width direction; a calculation unit that identifies positions of both ends in the width direction of the object to be measured on the basis of photographing data by the line sensor, and calculates a width of the object to be measured on the basis of the positions of both end; a storage unit that stores calibration data about a plurality of calibration points, which are acquired at a time of calibration performed using a calibration tool installed in the pass line, in a measurement range in the width direction; marks that are provided at prescribed reference points outside the measurement range within an area between the light source and the pass line; and a correction unit that identifies a position of the mark on the basis of the photographing data, and corrects calibration data on the basis of an amount of change when the position of the mark changes.SELECTED DRAWING: Figure 1 【課題】被測定物の幅を測定する測定装置において、光学配置が変化した場合でも幅測定を中断することなく校正データを適切な値に補正し、測定誤差を抑制する。【解決手段】測定装置は、光源と、被測定物が搬送される際に通過するパスラインを挟んで光源の反対側に配置され、被測定物を幅方向に撮影するラインセンサと、ラインセンサによる撮影データに基づいて被測定物の幅方向の両端の位置を特定し、両端の位置に基づいて被測定物の幅を算出する算出部と、パスラインに設置された校正用器具を用いて行った校正時に取得した、幅方向の測定範囲における複数の校正点についての校正データを記憶する記憶部と、光源とパスラインの間の領域内で、測定範囲の外側の所定の基準点に設置されたマークと、撮影データに基づいてマークの位置を特定し、マークの位置が変化した場合には、その変化量に基づいて校正データを補正する補正部と、を備える。【選択図】図１