公开(公告)号：US20190308420A1

公开(公告)日：2019-10-10

申请号：US16295081

申请日：2019-03-07

Applicant: Konica Minolta, Inc.

Inventor： Yutaka YAMAMOTO ,  Tatsuya EGUCHI ,  Shigetaka KATO ,  Taku KIMURA

IPC: B41J2/47 ,  G02B26/12

Abstract: An image forming apparatus including a polygon mirror that deflects a light beam, the image forming apparatus includes: an optical sensor arranged such that the light beam deflected by the polygon mirror enters the optical sensor; and a hardware processor that measures an output level of the optical sensor and calculates, as a remaining life of the polygon mirror, an operation time of the polygon mirror to when the output level becomes a threshold value in a case of assuming that the output level ongoingly changes at a rate of change over time that is a change amount of the output level per unit operation time of the polygon mirror, using the measured output level.

公开(公告)号：US20180267447A1

公开(公告)日：2018-09-20

申请号：US15914277

申请日：2018-03-07

Applicant: Konica Minolta, Inc.

Inventor： Shigetaka KATO ,  Seiichi KIRIKUBO ,  Yutaka YAMAMOTO ,  Naoto SUGAYA ,  Nobuhiro MATSUO

IPC: G03G15/20 ,  G03G15/00

CPC classification number: G03G15/2039 ,  G03G15/5004 ,  G06K15/4055

Abstract: An image forming apparatus: acquires, before start of current supply to electric elements including heater, information indicating rated power of the heater and total consumption power of the electric elements excluding the heater; subtracts the total consumption power from upper power limit of the apparatus, and calculates maximum power not exceeding the rated power and remaining power thus subtracted; obtains duty ratio based on assumption of current supply corresponding to the maximum power according to pulse modulation, and determines whether the duty ratio falls within predetermined range; and controls, when the duty ratio falls within the range, drive circuit to supply alternating current by pulse modulation method, and when the duty ratio falls outside the range, to supply the alternating current by phase control method that temporarily interrupts the supply of the alternating current to the heater in half cycles of the alternating current.

公开(公告)号：US20210061603A1

公开(公告)日：2021-03-04

申请号：US17004527

申请日：2020-08-27

Applicant: Konica Minolta, Inc.

Inventor： Yutaka YAMAMOTO ,  Akinori KIMATA ,  Hiroshi EGUCHI ,  Yuji KOBAYASHI ,  Natsuyo IDA ,  Yasuhiro ISHIHARA

IPC: B65H7/14

Abstract: An image forming device including an optical sensor, an ultrasound sensor, and a conveyance guide. The optical sensor and the ultrasound sensor are disposed alongside a conveyance path of a sheet and are used to determine sheet type. The conveyance guide guides the sheet along the conveyance path. The conveyance guide is structured such that, on the conveyance path between the optical sensor and the ultrasound sensor, the sheet is in contact with the conveyance guide while a portion of the sheet is in a light irradiation range of the optical sensor and a different portion of the sheet is in an ultrasound irradiation range of the ultrasound sensor.