# US 2021/0243322 A1 · Image reading apparatus

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- Number: US 2021/0243322 A1
- Document ID: US20210243322A1
- Status: Published application
- Kind: A1
- Application number: 17/156,212
- Filed: 2021-01-22
- Published: 2021-08-05
- Earliest claimed: 2020-02-05
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Kenji OOKI
- Web page: https://patentgrep.com/patent/US20210243322A1

## CPC

- H04N 1/00822: {Selecting or setting a particular reading mode, e.g. from amongst a plurality of modes, simplex or duplex, or high or low resolution}
- H04N 1/00689: {Presence}
- H04N 1/00694: {in an input tray}
- H04N 1/00737: {using the scanning elements as detectors}
- H04N 1/1039: {Movement of the main scanning components}
- H04N 1/1215: {Feeding using one or more cylindrical platens or rollers in the immediate vicinity of the main scanning line}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image reading apparatus includes a document tray on which a document is stacked; a conveyance unit configured to convey the document stacked on the document tray; a reader configured to read the image of the document conveyed by the conveyance unit using a sensor. The sensor includes a first light receiving element row having a plurality of light receiving elements, which receives light of a first color, arranged in a main scanning direction; and a second light receiving element row having a plurality of light receiving elements, which receives light of a second color, arranged in the main scanning direction, wherein the first light receiving element row and the second light receiving element row are arranged in a sub-scanning direction orthogonal to the main scanning direction. The image reading apparatus further includes a setting unit and a determination unit.

## Claims

### Claim 1

An image reading apparatus, comprising:
a document tray on which a document is stacked;
a conveyance unit configured to convey the document stacked on the document tray;
a reader configured to read the image of the document conveyed by the conveyance unit using a sensor, the sensor comprising:
a first light receiving element row having a plurality of light receiving elements, which receives light of a first color, arranged in a main scanning direction; and
a second light receiving element row having a plurality of light receiving elements, which receives light of a second color, arranged in the malin scanning direction, wherein the first light receiving element row and the second light receiving element row are arranged in a sub-scanning direction orthogonal to the main scanning direction,
a setting unit configured to set a resolution for reading, by the reader, an image of the document to one of a first resolution or a second resolution which is higher than the first resolution; and
a determination unit configured to determine whether the document read by the reader is a chromatic document or an achromatic document based on a reading result of the reader,
wherein the reader is configured to read, when determining whether the document is the chromatic document or the achromatic document by the determination unit, the image of the document in the second resolution regardless of the resolution set by the setting unit.

### Claim 2 (depends on 1)

The image reading apparatus according to claim 1, wherein, in a case where the reader reads image of the document using the determination unit and the resolution set by the setting unit is the first resolution, after determining whether the image of the document read in the second resolution is chromatic or achromatic by the determination unit, the reader reads the image of the document in the first resolution using a determination result of the determination.

### Claim 3 (depends on 1)

The image reading apparatus according to claim 1, wherein the first light receiving element row and the second light receiving element row of the reader are arranged such that the first light receiving element row and the second light receiving element row read positions shifted by 0.5 line from each other in the first resolution.

### Claim 4 (depends on 1)

The image reading apparatus according to claim 1, wherein the first light receiving element row and the second light receiving element row of the reader are arranged such that the first light receiving element row and the second light receiving element row read positions shifted by one line from each other in the second resolution.

### Claim 5 (depends on 1)

The image reading apparatus according to claim 1, wherein the reader includes CMOS.

### Claim 6 (depends on 1)

The image reading apparatus according to claim 1, wherein the reader includes CIS.

### Claim 7 (depends on 1)

The image reading apparatus according to claim 1, wherein the reader reads the image of the document in the resolution set by the setting unit in a case where the reader reads the image of the document without using the determination unit.