An image-reading device is provided with a first detection unit for detecting that the front side of a cover is within a first distance to ca copy holder, a second detection unit for detecting that an opening/closing support part is within a second distance to the copy holder, and a control unit. The contorl unit: acquires first detection information due to the first detection unit and second detection information due to the second detection unit, respectively; and identifies, on the basis of the first detection information and the second detection information, whether a copy set in place has a thickness equal to or greater than a fixed value.

Disclosed is a document holder assembly for attachment to a mobile device or its enclosure. The document holder assembly has an imaging position in which the document is positioned in the line of sight of the device camera, and a folded position in which the assembly is conveniently stored close to the attachment face. In some embodiments the distance between the document and the camera in the imaging position may be adjusted to achieve an optimum document image.

Disclosed is a document holder assembly for attachment to a mobile device or its enclosure. The document holder assembly has an imaging position in which the document is positioned in the line of sight of the device camera, and a folded position in which the assembly is conveniently stored close to the attachment face. In some embodiments the distance between the document and the camera in the imaging position may be adjusted to achieve an optimum document image.