Image analysis – Applications – Manufacturing or product inspection
Patent
1997-12-29
2000-09-05
Bella, Matthew
Image analysis
Applications
Manufacturing or product inspection
382108, 382144, 382192, 382321, 25055946, 356225, 356237, 348128, G06K 900
Patent
active
061154903
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for determining the powder density on a dusted print product according to the preamble of claim 1.
2. Discussion of the Relevant Art
The prior patent application 195 01 346.8 relates to a measurement apparatus of this kind.
SUMMARY OF THE INVENTION
The invention is intended to develop a measurement apparatus of this kind in such a way that a further improved identification of the individual powder particles located on the printed print product is guaranteed.
For a corresponding contrast intensification, according to the distinguishing feature of claim 1 it is proposed to arrange a diaphragm body at the image-side focal point of the optics forming an image of a region of the surface of the print product on the image converter. As the axis of the optics is set at an angle to the surface of the print product which is different from the angle of reflection of the measurement light beam, a further improved suppression of light not reflected by powder particles is obtained in this way.
Advantageous developments of the invention are quoted in sub-claims.
In the items of measurement apparatus according to claim 2 and 3 the form of the opening provided in the diaphragm body is matched to the geometry of the particular image converter used.
With a measurement apparatus according to claim 4, the print product may be reliably measured in a simple manner.
With the development according to claim 5 it is possible reliably to extend the powder density measurement to the entire region of the print product, and thus not only measure in one direction, which runs transverse to the direction in which the print product is fed through the dusting apparatus, but also in the feed direction itself. In this way it is possible not only to determine whether some of the nozzles of the powder dusting apparatus, which are arranged crosswise to the feed direction of the print product, are dispensing uneven quantities of powder, but also to determine whether the different powder dispensing nozzles are operating constantly, i.e. without variations in time.
The development of the invention according to claim 6 enables a measurement apparatus to be produced on the basis of basic components which are obtainable on the market at low cost, and which need only slight modification.
The development of the invention according to claim 7 is advantageous in respect of a further improvement of the contrast when representing the powder particles.
The development of the invention according to claim 8 permits a glancing illumination of the surface of the print product with compact dimensions of measurement head and illumination unit.
The purpose of the development of the invention according to claim 9 is also to increase the contrast when generating the powder particle image, as reflections of measurement light on the underside of the housings of measurement head and illumination unit are eliminated.
According to claim 10, a common commercial scanner can be converted into a powder density measurement apparatus with simple means and without major intervention in the scanner.
With the development of the invention according to claim 11 it is achieved that the entrance window of the scanner is raised somewhat from the surface of the print product so that the powder particle distribution is not changed when the scanner is moved. At the same time, a small slit-shaped chamber, via which the measurement light beam is supplied, is created between the underside of the scanner housing and the surface of the print product.
With the development of the invention according to claim 12, an electronic contrast increase for the production of the image of the powder particles located on the surface of the print product is obtained at the same time by simple means.
The same advantage is obtained according to claim 13 for the representation o
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Bella Matthew
Chawan Sheela
LandOfFree
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