US 10,897,552 B2Granted

Image reading apparatus and original size detection method

AssigneeCanon Kabushiki Kaisha

InventorHiromu Shimizu

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Abstract

An image reading apparatus includes: a reading unit, which is configured to read an original placed on an original table in a main scanning direction by irradiating the original with light; and a sub-scanning size detector, which is configured to detect presence or absence of the original on the original table by radiating invisible rays. When the platen cover forms an angle of equal to or smaller than a first angle with respect to the original table, the image reading apparatus determines a size of the original in a sub-scanning direction in accordance with a detection result acquired from the sub-scanning size detector. When the platen cover forms an angle equal to or smaller than a second angle, which is smaller than the first angle, with respect to the original table, the image reading apparatus determines a size of the original in the main scanning direction.

Claims10

Dependent claims

An image reading apparatus, comprising:

an original table for placing an original subjected to reading;
a platen cover mounted to the original table so as to be openable and closable with respect to the original table;
an angle detector configured to detect a first state in which the platen cover forms a first angle with respect to the original table and a second state in which the platen cover forms a second angle smaller than the first angle with respect to the original table;
a reader, which includes an illumination portion for irradiating the original placed on the original table with light and a light receiving portion for receiving reflected light of irradiated light reflected from the original, and is configured to read the original in a main scanning direction in accordance with the reflected light received at the light receiving portion;
a sub-scanning size detector configured to detect presence or absence of an original placed on the original table by radiating invisible rays;
an original size determination device configured to determine a size of the original in the main scanning direction in accordance with a reading result by the reader and determine a size of the original in a sub-scanning direction orthogonal to the main scanning direction in accordance with a detection result by the sub-scanning size detector;
and
a controller configured to:
control the original size determination device to acquire a detection result by the sub-scanning size detector in accordance with closing of the platen cover to a first state based on a detection result by the angle detector;
and
control the illumination portion to emit light in accordance with a change of the platen cover from the first state to a second state.
wherein the first detection is a result of the subscanning size detector which is obtained in response to the first state detected by the angle detector,
wherein the second detection result is a detection result of the sub-scanning size detector which is obtained in response to the second state being detected by the angle detetor, and
wherein the second angle is less than 15°.

11 more elements

An original size detection method, which is performed by an apparatus including:

an original table for placing an original subjected to reading;
a platen cover, which is mounted to the original table so as to be openable and closable with respect to the original table;
a reader, which includes an illumination portion for irradiating the original placed on the original table with light and a light receiving portion for receiving reflected light of irradiated light reflected from the original, and is configured to read the original in a main scanning direction in accordance with the reflected light received at the light receiving portion;
and
a sub-scanning size detector, which is configured to detect presence or absence of an original placed on a predetermined position of the original table by radiating invisible rays,
the original size detection method comprising:
determining a size of the original based on a reading result by the reader and first and second detection results by the sub-scanning size detector;
and
causing the illumination portion to emit light in accordance with a change of an angle, with respect to the original table, of the platen cover from a first angle to a second angle, the second angle being smaller than the first angle,
wherein the first detection result is a detection result of the sub-scanning size detector which is obtained in response to the first angle of the platen cover being detected,
wherein the second detection result is a detection result of the sub-scanning size detector which is obtained in response to the second angle of the platen cover being detected, and
wherein the second angle is less than 15° .

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/954,310Filed 16 Apr 2018
Priority: JP 2017-08667225 Apr 2017
Published: US 2018/0309894 A125 Oct 2018
Granted: 19 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04N 1/00997
Arrangements for regulating environment, e.g. removing static electricity: light control, e.g. shielding from ambient light or preventing light…
H04N 1/00687
Object of the detection: presence or absence
H04N 1/0071
Size or dimensions: width
H04N 1/00713
Size or dimensions: length