JP2009075119A5 - - Google Patents

Claims (10)

A paper surface detection device for detecting the surface state of paper,
A light emitting means for irradiating the surface of the paper with light;
A reading unit that reads reflected light, which is emitted from the light emitting unit and reflected by the photographing surface of the paper, as a surface image;
Detecting means for detecting information on the photographing surface of the paper based on the surface image read by the reading means;
When the light emitting means is at a position away from the photographing surface and the incident direction of light from the light emitting means to the paper is viewed from a direction perpendicular to the photographing surface, the incident direction is the paper transport direction. The paper surface detection device detects information relating to the concavo-convex state of the photographing surface regardless of the direction of the fiber of the paper.   2. The paper surface detection device according to claim 1, wherein the light emitting means is arranged so that an angle formed by the incident direction and the paper transport direction is an angle in a range of 15 degrees to 75 degrees. The said reading means is an area sensor that reads a surface image of an area of a predetermined size on the surface of the paper, or a line sensor that reads a line image of the surface of the paper. Paper surface detection device.   The paper surface detection apparatus according to claim 1, wherein the information on the uneven state includes a contrast of the surface image.   5. The paper surface detection apparatus according to claim 1, wherein the information about the uneven state includes the number of edges of an image obtained by binarizing the surface image. 6. Image forming means for forming an image on paper, light emitting means for irradiating light on the surface of the paper, and reading means for reading reflected light reflected from the photographing surface of the paper as emitted from the light emitting means as a surface image An image forming apparatus comprising: a detecting unit that detects information on a photographing surface of the paper based on the surface image read by the reading unit; and a control unit that controls image forming conditions of the image forming unit.
When the light emitting means is at a position away from the photographing surface and the incident direction of light from the light emitting means to the paper is viewed from a direction perpendicular to the photographing surface, the incident direction is the paper transport direction. By detecting the information on the uneven state of the imaging surface regardless of the direction of the fiber of the paper
The image forming apparatus according to claim 1, wherein the control unit controls an image forming condition of the image forming unit based on information on the detected uneven state of the imaging surface.   The image forming apparatus according to claim 6, wherein the light emitting unit is arranged so that an angle formed by the incident direction and the paper transport direction is an angle in a range of 15 degrees to 75 degrees.   8. The apparatus according to claim 6, wherein the reading unit is an area sensor that reads a surface image of an area of a predetermined size on the surface of the paper, or a line sensor that reads a line image of the surface of the paper. Image forming apparatus. The information on the uneven state includes the contrast of the surface image,
The image forming apparatus according to claim 6, wherein the control unit controls the image forming condition based on the contrast. The information on the uneven state includes the number of edges of the image obtained by binarizing the surface image,
The image forming apparatus according to claim 6, wherein the control unit controls the image forming condition based on the number of edges of the image.