Patent ID: 7697762
Filing Date: 2010-04-13
Classification: G03B

Abstract:
1. An image scanning unit configured to read a document, comprising: a document-contact face having a first side in a main scanning direction and a second side in a sub-scanning direction; a light-source unit configured to array a plurality of light-emitting elements in the main scanning direction with a pitch to emit light beams to the document-contact face; and a light-guiding member, having a plurality of planes, provided between the light-source unit and the document-contact face and configured to guide the light beams from the plurality of light-emitting elements to the document-contact face, the light-guiding member having a length in the main scanning direction which is defined with the pitch of the plurality of light-emitting elements, and a length of the document-contact face and the light-source unit in the main scanning direction, wherein the length of the document-contact face is Wp in the main scanning direction, the length of the light-source unit is W the length of the light-guiding member is Wg in the main scanning direction, and the pitch of the light-emitting elements is PI, to satisfy relationships Wp<Wg, and W