Line sensor, image reading device, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10812673-B2
Application number	US-201916510462-A
Country	US
Kind code	B2
Filing date	Jul 12, 2019
Priority date	Dec 25, 2014
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

In a CMOS sensor 107 including a light-receiving-element row in which a plurality of photodiodes 1204 are disposed side by side in a main scanning direction and a plurality of color filters 1202 that are disposed in correspondence with the plurality of photodiodes 1204, the center of each color filter 1202 is displaced in a direction of the center of the light-receiving-element row from the center of the photodiode 1204 corresponding to the color filter.

First claim

The invention claimed is:

1. A line sensor comprising:
a first light receiving element row including a plurality of light receiving elements that are disposed in a first direction, a first plurality of transmitting portions each corresponding to a different one of the plurality of light receiving elements disposed in the first light receiving element row and a first plurality of condensing portions each corresponding to a different one of the plurality of light receiving elements disposed in the first light receiving element row, wherein the first plurality of transmitting portions include a first transmitting portion transmitting light having a first color, a second transmitting portion transmitting light having a second color different from the first color and a third transmitting portion transmitting light having a third color different from both the first color and the second color;
a second light receiving element row including a plurality of light receiving elements that are disposed in the first direction, a second plurality of transmitting portions each corresponding to a different one of the plurality of light receiving elements disposed in the second light receiving element row and a second plurality of condensing portions each corresponding to a different one of the plurality of light receiving elements disposed in the second light receiving element row, wherein the second plurality of transmitting portions include the first transmitting portion, the second transmitting portion and the third transmitting portion;
a third light receiving element row including a plurality of light receiving elements that are disposed in the first direction, a third plurality of transmitting portions each corresponding to a different one of the plurality of light receiving elements disposed in the third light receiving element row and a third plurality of condensing portions each corresponding to a different one of the plurality of light receiving elements disposed in the third light receiving element row, wherein the third plurality of transmitting portions include the first transmitting portion, the second transmitting portion and the third transmitting portion; and
wherein the first light receiving element row, the second light receiving element row, and the third light receiving element row are disposed at a predetermined interval in a second direction orthogonal to the first direction,
wherein each of the first light receiving element row, the second light receiving element row and the third light receiving element row includes a light receiving element corresponding to the first transmitting portion, a light receiving element corresponding to the second transmitting portion disposed adjacent to one side of the first transmitting portion in the first direction, and a light receiving element corresponding to the third transmitting portion disposed adjacent to other side of the first transmitting portion in the first direction,
wherein in the first light receiving element row, a distance in the first direction between a center in the first direction of the first light receiving element row and a center in the first direction of a first light receiving element disposed on a first position in the first direction is longer than a distance in the first direction between the center of the first light receiving element row and a center in the first direction of a transmitting portion corresponding to the first light receiving element,
a distance in the first direction between the center in the first direction of the first light receiving element row and a center in the first direction of a second light receiving element adjacent to the first light receiving element in the first direction is longer than a distance in the first direction between the center in the first direction of the first light receiving element row and a center in the first direction of a transmitting portion corresponding to the second light receiving element,
the distance in the first direction between the center in the first direction of the first light receiving element row and the first position is longer than a distance in the first direction between the center of the first light receiving element row and a second position where the second light receiving element is disposed in the first direction,
a distance in the first direction between the center in the first direction of the first light receiving element and the center in the first direction of the transmitting portion corresponding to the first light receiving element is longer than a distance in the first direction between the center in the first direction of the second light receiving element and the center in the first direction of the transmitting portion corresponding to the second light receiving element,
wherein, in the second direction, a position of a center of the transmitting portion corresponding to the first light receiving element is same as a position of a center of the transmitting portion corresponding to the second light receiving element,
wherein a condensing portion corresponding to the first light receiving element is disposed opposite to the first light receiving element with respect to the transmitting portion corresponding to the first light receiving element in a third direction orthogonal to both the first direction and the second direction,
wherein a condensing portion corresponding to the second light receiving element is disposed opposite to the second light receiving element with respect to the transmitting portion corresponding to the second light receiving element in the third direction,
wherein the distance in the first direction between the center in the first direction of the first light receiving element row and the center in the first direction of the first light receiving element is longer than a distance in the first direction between the center in the first direction of the first light receiving element row and a center in the first direction of the condensing portion corresponding to the first light receiving element,
the distance in the first direction between the center in the first direction of the first light receiving element row and the center in the first direction of the second light receiving element is longer than a distance in the first direction between the center in the first direction of the first light receiving element row and a center of a condensing portion corresponding to the second light receiving element,
a distance in the first direction between the center in the first direction of the first light receiving element and the center in the first direction of the condensing portion corresponding to the first light receiving element is longer than a distance in the first direction between the center in the first direction of the second light receiving element and the center in the first direction of the condensing portion corresponding to the second light receiving element,
wherein, in the second direction, a position of a center of the condensing portion corresponding to the first light receiving element is same as a position of a center of the condensing portion corresponding to the second light receiving element,
wherein a distance in the first direction between the center in the first direction of the first light receiving element row and an end portion of the first light receiving element opposite to a center side of the first light receiving element row in the first direction, is longer than a distance in the first direction between the center in the first direction of the first light receiving element row and an end portion of the transmitting portion corresponding to the first light receiving element opposite to the center side in the first direction,
a distance in the first direction between the center in the first direction of the first light receiving element row and an end portion of the second light receiving e

Assignees

• Canon Kk

Inventors

• Akagi Daisuke
• Ogura Masanori
• Iba Jun
• Furubayashi Atsushi

Classifications

• H04N23/12

  with one sensor only · CPC title

• H10F99/00

  Subject matter not provided for in other groups of this subclass · CPC title

• H04N1/1013 Primary

  with sub-scanning by translatory movement of at least a part of the main-scanning components (H04N1/107 takes precedence) · CPC title

• H04N1/028

  for picture information pick-up · CPC title

• H04L27/14

  Demodulator circuits; Receiver circuits · CPC title