Method and device to detect negatively effected regions on an image carrier
AssigneeOce Printing Systems GmbH
InventorChristian Kopp
Life of this patent
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Abstract
In a method to determine a negative effect on a surface of an image carrier of a print group, a reflection spectrum is determined of a region of the surface of the image carrier, the reflection spectrum indicating an intensity of light for different wavelengths. The light is reflected from the region of the surface of the image carrier. A reference spectrum is determined for the region of the surface of the image carrier. The reflection spectrum is then compared with the reference spectrum. Depending on the comparison, the determination is made whether a negative effect is present at the region of the surface of the image carrier.
Claims13
A method to analyze a surface of an image carrier of a print unit of an electrophotographic digital printer, comprising:
- illuminating a region of the surface of the image carrier with a light source;
- measuring the region of the surface of the image carrier to determine a reference spectrum for the region of the surface of the image carrier;
- measuring the region of the surface of the image carrier to determine a reflection spectrum of the region of the surface of the image carrier, the reflection spectrum indicating an intensity of light for different wavelengths, said light being reflected from the region of the surface of the image carrier;
- comparing the reflection spectrum with the reference spectrum;
- and
- determining a presence of a disturbance on the surface of the image carrier at the region of the surface of the image carrier based on the comparison of the reflection spectrum and the reference spectrum.
A print unit for an electrophotographic digital printer, comprising:
- a photoconductor configured to create a latent print image;
- a developer station configured to generate an inked image by inking the latent print image with toner particles;
- a transfer station configured to transfer the inked image onto a recording medium;
- an erasure light configured to reduce an electrical charge on the surface of the photoconductor after transfer of the inked image;
- a cleaner configured to clean the photoconductor after the reduction of the electrical charge and the transfer of the inked image, wherein the erasure light is further configured to illuminate a region of a surface of the photoconductor to facilitate a measurement of the surface of the photoconductor;
- a sensor configured to detect a reflection spectrum from the illuminated region of the surface of the photoconductor, the reflection spectrum indicating an intensity of light for different wavelengths, said light being reflected from the region of the surface of the photoconductor;
- and
- an analyzer configured to detect, based on the reflection spectrum, a disturbance on the region of the surface of the photoconductor.
Dependencies are inferred from the claim text.