IP Library › Granted Patent US 12704803
Granted Patent B2
US 12704803 · App. 18/918,614 · Granted Aug 11, 2026

Image forming apparatus

Inventor: Sumito Tanaka (Tokyo, JP)
Assignee: Canon Kabushiki Kaisha
G03G15/5016G03G15/04036G03G15/5041G03G15/5058G03G15/5062G03G2215/00067
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Quick Facts
Patent No.
US 12704803
App. No.
18/918,614
Granted
Aug 11, 2026
Kind
B2
Abstract

An image forming apparatus includes a platen on which an original is to be placed, a feeder configured to feed an original placed on a tray, a sensor configured to detect a sheet on the tray, a lamp provided to the feeder, a reader configured to read the original placed on the platen and to read the original conveyed by the feeder, an image forming unit configured to form an image on a sheet, and a controller. The controller is configured to control the image forming unit to form a test image on a sheet, control the reader to read the test image formed on the sheet placed on the platen, control a density of the image to be formed by the image forming unit based on a reading result of the test image.

Claims (21)

1 . An image forming apparatus, comprising:

a platen on which an original is to be placed;

a feeder configured to feed an original placed on a tray;

a sensor configured to detect a sheet on the tray;

a lamp provided for the feeder, and configured to emit light when the sensor detects a sheet;

a reader configured to read the original placed on the platen and to read the original conveyed by the feeder;

an image forming unit configured to form an image on a sheet; and

a controller configured to:

control the image forming unit to form a test image on a sheet;

control the reader to read the test image formed on the sheet fed by the feeder; and

control the density of the image to be formed by the image forming unit based on a reading result of the test image, the lamp being turned on before the sheet on which the test image is formed is detected by the sensor,

wherein the controller is configured to control, in a case in which the test image is formed by the image forming unit, the lamp to emit light before the sheet on which the test image is formed is detected by the sensor, and

wherein a lighting pattern of the lamp in a case in which the test image is formed by the image forming unit is different from a lighting pattern of the lamp in a case in which the original is placed on the tray.

2 . The image forming apparatus according to claim 1 , wherein the controller is configured to control the lamp to blink in a case in which the test image is formed by the image forming unit.

3 . The image forming apparatus according to claim 1 , wherein the controller is configured to control the lamp to start emitting light after receiving user instruction information for an instruction to form the test image.

4 . The image forming apparatus according to claim 1 ,

wherein the test image includes images having different tones.

5 . The image forming apparatus according to claim 1 ,

wherein the controller includes a tone control unit configured to convert an image signal based on a conversion condition,

wherein the image forming unit is configured to form the image based on the converted image signal, and

wherein the controller is configured to generate, in a case in which the test image is read by the reader, the conversion condition based on the reading result of the test image.