公开(公告)号：US09167126B2

公开(公告)日：2015-10-20

申请号：US14522330

申请日：2014-10-23

Applicant: CANON FINETECH INC.

Inventor： Nobuyuki Tochigi

IPC: H04N1/04 ,  H04N1/10 ,  H04N1/028 ,  H04N1/40

CPC classification number: H04N1/1039 ,  H04N1/0281 ,  H04N1/02885 ,  H04N1/40056 ,  H04N2201/0081 ,  H04N2201/0094

Abstract: An image reading apparatus sets an irradiation region below a fixed reading glass when light guide members diffuse light of LEDs upward so that the irradiation region corresponding to a significantly sagged portion in a main scanning direction is wider than that corresponding to portions on both sides of the significantly sagged portion, and sets a light intensity of a plurality of LEDs corresponding to the significantly sagged portion in the main scanning direction to be larger than that of a plurality of LEDs corresponding to the portions on both sides of the significantly sagged portion. Therefore, the degradation of the illuminance corresponding to the significantly sagged portion due to the pressed fixed reading glass can be prevented, and the entire document can be read with uniform reading precision.

Abstract translation: 当导光部件向上扩散LED的光时，图像读取装置将照射区域设置在固定的读数玻璃下方，使得与主扫描方向上的显着下垂部分对应的照射区域比对应于主扫描方向两侧的部分的照射区域宽 并且将与主扫描方向上的显着下垂部分对应的多个LED的光强设定为大于对应于显着下垂部分两侧部分的多个LED的光强度。 因此，可以防止由于按压的固定读数玻璃而对应于显着下垂的部分的照度的劣化，并且可以以均匀的读取精度读取整个文档。

公开(公告)号：US20150116791A1

公开(公告)日：2015-04-30

申请号：US14522330

申请日：2014-10-23

Applicant: CANON FINETECH INC.

Inventor： Nobuyuki Tochigi

IPC: H04N1/10 ,  H04N1/40 ,  H04N1/028

CPC classification number: H04N1/1039 ,  H04N1/0281 ,  H04N1/02885 ,  H04N1/40056 ,  H04N2201/0081 ,  H04N2201/0094

Abstract: An image reading apparatus sets an irradiation region below a fixed reading glass when light guide members diffuse light of LEDs upward so that the irradiation region corresponding to a significantly sagged portion in a main scanning direction is wider than that corresponding to portions on both sides of the significantly sagged portion, and sets a light intensity of a plurality of LEDs corresponding to the significantly sagged portion in the main scanning direction to be larger than that of a plurality of LEDs corresponding to the portions on both sides of the significantly sagged portion. Therefore, the degradation of the illuminance corresponding to the significantly sagged portion due to the pressed fixed reading glass can be prevented, and the entire document can be read with uniform reading precision.

Abstract translation: 当导光部件向上扩散LED的光时，图像读取装置将照射区域设置在固定的读数玻璃下方，使得与主扫描方向上的显着下垂部分对应的照射区域比对应于主扫描方向两侧的部分的照射区域宽 并且将与主扫描方向上的显着下垂部分对应的多个LED的光强设定为大于对应于显着下垂部分两侧部分的多个LED的光强度。 因此，可以防止由于按压的固定读数玻璃而对应于显着下垂的部分的照度的劣化，并且可以以均匀的读取精度读取整个文档。