公开(公告)号：US20190068816A1

公开(公告)日：2019-02-28

申请号：US16111428

申请日：2018-08-24

Applicant: KYOCERA Document Solutions Inc.

Inventor： Minoru TOKONAMI

IPC: H04N1/00

CPC classification number: H04N1/00816 ,  H04N1/00551 ,  H04N1/00997

Abstract: An image reading device includes a housing that is provided with a contact glass, a document cover, an illumination unit that is received in the housing, and a document size detection unit that performs a document size detection operation for detecting a size of a document by using light irradiated toward the document on the contact glass from the illumination unit when the document cover is switched to a closed state. The illumination unit includes a light guide body extending in a front and rear direction of the housing, a first light source that is disposed at a front side of the light guide body and emits incident light to the light guide body toward a rear side, and a second light source that is disposed at a rear side of the light guide body. In the document size detection operation, only the first light source is lighted.