US 12,231,606 B2
Image reading apparatus
Noriyuki Koyanagi, Kitakyushu (JP); and Tokujiro Okuno, Kitakyushu (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/343,562.
Application 18/343,562 is a continuation of application No. 17/664,527, filed on May 23, 2022, granted, now 11,729,330.
Application 17/664,527 is a continuation of application No. 17/087,331, filed on Nov. 2, 2020, granted, now 11,343,399, issued on May 24, 2022.
Application 17/087,331 is a continuation of application No. 16/117,222, filed on Aug. 30, 2018, granted, now 10,863,046, issued on Dec. 8, 2020.
Application 16/117,222 is a continuation of application No. 15/042,000, filed on Feb. 11, 2016, granted, now 10,091,375, issued on Oct. 2, 2018.
Claims priority of application No. 2015-025473 (JP), filed on Feb. 12, 2015.
Prior Publication US 2023/0344948 A1, Oct. 26, 2023
Int. Cl. G06F 3/12 (2006.01); H04N 1/00 (2006.01)
CPC H04N 1/00822 (2013.01) [H04N 1/0057 (2013.01); H04N 1/00716 (2013.01); H04N 1/00729 (2013.01); H04N 1/00806 (2013.01); H04N 1/00811 (2013.01); H04N 2201/0081 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image reading apparatus comprising:
a transport unit comprising transport rollers which are configured to transport a document;
a reading unit comprising first and second sensors which are configured to read an image of the document which is transported by the transport unit;
a sonic wave sensor which outputs a sonic wave to a document which is transported by the transport unit, and detects an attenuation rate of the sonic wave; and
a controller which generates image data as data of the image which is read by the reading unit,
wherein, as operation modes for performing reading in the reading unit, there are a first reading mode and a second reading mode in which resolutions of the generated image data are the same, and transport speeds are different from each other,
wherein the controller transports the document at a low speed when reading the document in the second reading mode compared to a case in which the document is read in the first reading mode,
wherein an operation mode of reading a document with a first thickness is set to the first reading mode, and an operation mode of reading a document with a second thickness which is thinner than the document with the first thickness is set to the second reading mode, and
wherein the controller determines that the document which is transported by the transport unit is thin when an attenuation rate of a sonic wave which is detected by the sonic wave sensor under a circumstance in which the document is transported by the transport unit is less than a determining attenuation rate, and executes the second reading mode.