US 11,984,702 B2
Optical scanning device, image-forming apparatus, and control method
Kazutaka Matsumoto, Sakai (JP); and Hiroyuki Asoda, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Dec. 27, 2021, as Appl. No. 17/562,339.
Claims priority of application No. 2021-001574 (JP), filed on Jan. 7, 2021; and application No. 2021-003649 (JP), filed on Jan. 13, 2021.
Prior Publication US 2022/0216671 A1, Jul. 7, 2022
Int. Cl. H01S 5/042 (2006.01); B41J 2/44 (2006.01); B41J 2/47 (2006.01); G03G 15/04 (2006.01); H01S 5/00 (2006.01); H01S 5/06 (2006.01); H01S 5/0683 (2006.01)
CPC H01S 5/0427 (2013.01) [B41J 2/442 (2013.01); B41J 2/471 (2013.01); H01S 5/0071 (2013.01); H01S 5/0617 (2013.01); H01S 5/0683 (2013.01); G03G 15/04 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical scanning device comprising:
a laser light emitter in which an excess of a current over a bias current is increased or decreased in proportion to an analog signal input thereto;
a laser driver to drive the laser light emitter;
an optical scanner to scan a surface of an object with laser light emitted from the laser light emitter;
a light quantity detector to detect a quantity of light of the laser light;
a laser driver controller to perform a stationary light quantity control in which the quantity of light emitted from the laser light emitter detected by the light quantity detector is controlled to be a target light quantity every time the optical scanner performs a line scanning;
a storage to store an offset adjusting table in which the target light quantity is associated with an offset value of the analog signal input to the laser light emitter; and
an offset value determiner to determine the offset value associated with the target light quantity by using the offset adjusting table, wherein
the laser driver controller controls the quantity of light emitted from the laser light emitter by inputting, to the laser driver, a signal generated by superimposing the determined offset value on the analog signal.