Calibration methods for placement machines incorporating on-head linescan sensing
AssigneeCyberOptics Corporation
InventorsTimothy A. Skunes, Eric P. Rudd, David W. Duquette
Life of this patent
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Abstract
A method of calibrating a pick and place machine having an on-head linescan sensor is disclosed. The calibration includes obtaining z-axis height information of one or more nozzle tips via focus metric methods, including a Fourier transform method and a normalized correlation method. Additionally, other physical characteristics such as linear detector tilt, horizontal scale factor, and vertical scale factor are measured and compensated for in the process of placing the component. Nozzle runout, another physical characteristic, is also measured by a sinusoidal curve fit method, and the resulting Z-height calibration data is used to later place the component.
Claims13
A method of calibrating a pick and place machine having at least one nozzle, the method comprising:
- scanning the at least one nozzle with an on-head linescan sensor to provide a scanned image;
- calculating a physical characteristic of the at least one nozzle based at least in part on the scanned image;
- placing a component based at least in part on the calculated physical characteristic;
- and
- wherein the nozzle is displaced in a Z direction after the step of scanning the at least one nozzle, and wherein the step of scanning the at least one nozzle is repeated to provide a plurality of additional scanned images, where the physical characteristic is a Z-height of the at least one nozzle.
A method of calibrating a pick and place machine having at least one nozzle, the method comprising:
- scanning the at least one nozzle with an on-head linescan sensor to provide a scanned image;
- calculating a physical characteristic of the at least one nozzle based at least in part on the scanned image;
- placing a component based at least in part on the calculated physical characteristic;
- and
- wherein the linescan sensor is mounted on a placement head, where the physical characteristic is a position of the at least one nozzle on the placement head.
Dependencies are inferred from the claim text.