Device for optically scanning a moving web of material and method for adjusting said device
AssigneeErhardt & Leimer GmbH
InventorsJuergen Eisen, Stefan Zott
Life of this patent
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Abstract
A device serves for optically scanning a moving material web. The device is formed by a CCD camera comprising a lens and a CCD receiving element, which is provided with photodiodes. So as to be able to exactly adjust the area of the material web scanned by means of the device, the CCD receiving element can be adjusted transversely in relation to the optical axis of the lens. For adjusting the CCD receiving element, a template with a structure is provided. This structure is detected by the photodiodes, and the signals emitted by the photodiodes act on a controlling device. The controlling device adjusts the CCD receiving element so that it is aligned with the structure of the template.
Claims12
A device for optically scanning a material web moving in a direction in a plane comprising:
- (a) at least one CCD camera directed at the material web comprising a lens having an optical axis and a CCD receiving element for scanning an area of the material web and generating signals from scanning the web;
- (b) a template disposed in the plane of the web for adjusting a scanning range of the device, said template having at least one structure extending transversely to the moving direction of the web and being detectable by the CCD camera;
- (c) at least one drive coupled to said CCD camera for adjusting the CCD receiving element transversely to the optical axis of the lens;
- and
- (d) a controlling device connected to said drive for controlling the drive in response to the signals from the CCD camera.
A method for adjusting a device for optically scanning a material web moving in a direction in a plane, said device having at least one CCD receiving element comprising photodiodes, each photodiode having a scanning range, which comprises the steps of:
- (a) positioning in the plane of the web a template having at least one structure extending transversely to the moving direction of the web;
- (b) detecting said structure by the photodiodes to generate signals;
- and
- (c) adjusting the position of the CCD receiving element to align with the structure in response to the signals.
Dependencies are inferred from the claim text.