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US 9,883,069 B2Granted
Image reading device and printing apparatus
AssigneeFUJIFILM Corporation
InventorsYoshiyuki Okayama, Takahiro Inoue
Life of this patent
Estimating the term…
Abstract
There are provided an image reading device and a printing apparatus that can reduce an influence of the shadows of suction holes. Suction holes, which are used to suck a sheet, are arranged on the peripheral surface of a drum that transports the sheet. The suction holes are arranged in grooves that are formed along a direction orthogonal to a transport direction. Accordingly, since an influence of the shadows of the suction holes can be reduced even in a case in which density unevenness is inspected on the basis of a read image, the false detection of density unevenness can be prevented.
Claims17
An image reading device comprising:
- a transport unit for transporting a sheet-like medium while sucking the medium on a medium holding surface on which suction holes are regularly arranged;
- and
- an image reading unit for reading an image from the medium transported by the transport unit, wherein
- grooves, which cross a holding area for the medium in a direction orthogonal to a transport direction, are regularly arranged along the transport direction on the medium holding surface, and the suction holes arranged on the medium holding surface are arranged in the grooves, and
- the grooves are formed so as to satisfy a condition where an integrated value of brightness in the transport direction, which is to be output, is constant over the entire area of a medium in a direction orthogonal to the transport direction and parallel to the medium holding surface in a case in which the medium having constant translucency and constant reflectivity is transported by the transport unit and is read by the image reading unit.
2 more elements
An image reading device comprising:
- a transport unit for transporting a sheet-like medium while sucking the medium on a medium holding surface on which suction holes are regularly arranged;
- and
- an image reading unit for reading an image from the medium transported by the transport unit,
- wherein when a line of the suction holes in a direction orthogonal to a transport direction is referred to as a row and a line of the suction holes in the transport direction is referred to as a column, the suction holes arranged on each row are arranged on the next columns of the suction holes arranged on the previous row, the same number of the suction holes are arranged on the respective columns, and the suction holes arranged on the respective columns are arranged so that the adjacent suction holes are adjacent to each other in a case in which the suction holes arranged on the respective columns are projected on a straight line orthogonal to the transport direction and parallel to the medium holding surface.
1 more element
An image reading device comprising:
- a transport unit for transporting a sheet-like medium while sucking the medium on a medium holding surface on which suction holes are regularly arranged;
- and
- an image reading unit for reading an image from the medium transported by the transport unit, wherein
- grooves, which cross a holding area for the medium in a direction orthogonal to a transport direction, are regularly arranged along the transport direction on the medium holding surface, and the suction holes arranged on the medium holding surface are arranged in the grooves,
- protrusions are further arranged regularly on the medium holding surface, and
- when a line of the protrusions in a direction orthogonal to the transport direction is referred to as a row and a line of the protrusions in the transport direction is referred to as a column, the protrusions arranged on each row are arranged on the next columns of the protrusions arranged on the previous row, the same number of the protrusions are arranged on the respective columns, and the protrusions arranged on the respective columns are arranged so that the adjacent protrusions are adjacent to each other in a case in which the protrusions arranged on the respective columns are projected on a straight line orthogonal to the transport direction and parallel to the medium holding surface.
3 more elements
Dependencies are inferred from the claim text.