公开(公告)号：US10698336B2

公开(公告)日：2020-06-30

申请号：US16442970

申请日：2019-06-17

Applicant: Konica Minolta, Inc.

Inventor： Tatsuya Eguchi ,  Hidenari Tachibe ,  Makoto Obayashi

IPC: G03G15/043 ,  G02B26/12 ,  G02B6/35 ,  G03G15/041

Abstract: An image forming apparatus including a polygon mirror that deflects a light beam includes: a light emitter that emits the light beam; an optical sensor that is disposed at a position on which the light beam deflected by the polygon mirror is incident; a detector that detects a minimum level being a light intensity level of the light beam, the lowest within a range detected by the optical sensor; a switcher that switches a light intensity level of the light beam emitted from the light emitter until the detector detects the minimum level; and a determiner that determines a degree of contamination of a component on an optical path of the light beam extending from the light emitter to the optical sensor, on the basis of the minimum level detected when the light intensity level is switched by the switcher.

公开(公告)号：US20190286006A1

公开(公告)日：2019-09-19

申请号：US16355342

申请日：2019-03-15

Applicant: Konica Minolta, Inc.

Inventor： Takafumi Yuasa ,  Hidenari Tachibe ,  Masayuki Iijima ,  Makoto Obayashi ,  Wataru Senoo

IPC: G03G15/043 ,  G02B26/12 ,  G02B27/09 ,  G02B27/30 ,  G03G15/04

Abstract: An optical scanning device that scans a photoreceptor with light, the device includes: a light emitter that emits light according to a supply current amount; a source-side optical system that includes an optical element corresponding to the light emitter, the optical element transmitting and shaping the light emitted from the corresponding light emitter; a polygon mirror that cyclically deflects the light shaped by the source-side optical system; an image-side optical system that condenses the light deflected by the polygon mirror on a surface of the photoreceptor; a motor that rotates the polygon mirror; and a light source controller that: monitors a temperature of the optical element; and adjusts the supply current amount for the light emitter or adjusts the temperature of the optical element corresponding to the light emitter to make a temperature difference between the light emitter and the corresponding optical element fall within an allowable range.

公开(公告)号：US09465313B2

公开(公告)日：2016-10-11

申请号：US14800803

申请日：2015-07-16

Applicant: KONICA MINOLTA, INC.

Inventor： Makoto Obayashi ,  Satoshi Masuda ,  Yoshikazu Watanabe ,  Masayuki Iijima ,  So Yano ,  Takaki Uemura

IPC: G03G15/00 ,  G03G15/04 ,  G03G15/043

CPC classification number: G03G15/04054 ,  G03G15/043

Abstract: An optical print head includes: light-emitting elements in line shape; first power line supplying first reference voltage; second power line supplying drive current to each light-emitting element and supplying second reference voltage; DAC outputting first voltage indicating light emission amount of each light-emitting element; first elements for holding first voltage difference between the first reference voltage and the first voltage; second elements each electrically connectable with corresponding first element and for holding second voltage difference between the second reference voltage and second voltage according to the first voltage, and during supply of drive current, controls each first element to hold the first difference by electrically disconnecting the first and second elements, and temporarily suspends supply of the drive current, and controls the second element to hold the second difference by electrically connecting the first and second elements, such that the drive current according to the second voltage difference is supplied.

Abstract translation: 光学打印头包括：线形的发光元件; 第一电源线提供第一参考电压; 第二电力线向每个发光元件提供驱动电流并提供第二参考电压; DAC输出表示每个发光元件的发光量的第一电压; 用于保持所述第一参考电压和所述第一电压之间的第一电压差的第一元件; 第二元件，其可以与相应的第一元件电连接，并且用于根据第一电压保持第二参考电压和第二电压之间的第二电压差，并且在供应驱动电流期间，通过电连接第一电压 和第二元件，并且暂时停止驱动电流的供给，并且通过电连接第一和第二元件来控制第二元件以保持第二差异，使得提供根据第二电压差的驱动电流。

公开(公告)号：US10389904B2

公开(公告)日：2019-08-20

申请号：US15974949

申请日：2018-05-09

Applicant: KONICA MINOLTA, INC.

Inventor： Makoto Obayashi ,  Takaki Uemura ,  Masayuki Iijima

IPC: G03G15/04 ,  H04N1/028 ,  G03G15/041 ,  G03G15/00 ,  G03G15/08 ,  G03G15/043 ,  F21Y115/10

Abstract: An image forming device includes: a photoreceptor; a longitudinal light emitting member constituted from light emitting element rows that are arranged in a lateral direction and are each constituted from light emitting elements arranged in a longitudinal direction; an optical member that is longitudinal and is disposed to condense light emitted from the light emitting elements onto the photoreceptor; and a hardware processor that: selects and causes one or more light emitting elements for each light emitting element row to emit light; acquires an exposure amount for each light emitting element row; calculates a distribution of the exposure amounts acquired for the light emitting element rows, and calculates a position in the lateral direction corresponding to a predetermined exposure amount in the distribution; and judges whether a difference between the calculated position and a reference position in the lateral direction at a reference time is less than a threshold value.

公开(公告)号：US10384464B2

公开(公告)日：2019-08-20

申请号：US15724868

申请日：2017-10-04

Applicant: Konica Minolta, Inc.

Inventor： Takaki Uemura ,  Makoto Obayashi ,  Masayuki Iijima

IPC: B41J2/45

Abstract: An optical print head including a light emitting member, an optical member, a detection unit, and a correction unit. The light emitting member is elongated in a longitudinal direction with light emitting elements arranged along the longitudinal direction. The optical member is elongated in the longitudinal direction with optical elements arranged along the longitudinal direction, the optical elements collecting light emitted by the light emitting elements. The detection unit detects an index value of linear expansion difference in the longitudinal direction of the light emitting member and the optical member. The correction unit uses the index value to correct an emitted light amount for each of the light emitting elements in order to offset differences in light collection efficiency caused by the linear expansion difference.

公开(公告)号：US09921515B2

公开(公告)日：2018-03-20

申请号：US14511205

申请日：2014-10-10

Applicant: KONICA MINOLTA, INC.

Inventor： So Yano ,  Satoshi Masuda ,  Makoto Obayashi ,  Masayuki Iijima ,  Yoshikazu Watanabe

IPC: G01J5/00 ,  G01K7/00 ,  G03G15/043 ,  G06K15/02 ,  G06K15/12 ,  G01K7/01 ,  G01K7/42

CPC classification number: G03G15/043 ,  B41J2/45 ,  G01K7/01 ,  G01K7/42 ,  G06K15/027 ,  G06K15/1247

Abstract: An optical writing device having; a plurality of light-emitting points; a photodiode configured to output a signal which represents a quantity of incident light from a predetermined light-emitting point selected from the plurality of light-emitting points; and a calculation section for calculating a temperature of the photodiode based on a magnitude of a photodiode dark current included in the signal output from the photodiode while the predetermined light-emitting point is OFF.

公开(公告)号：US20180104964A1

公开(公告)日：2018-04-19

申请号：US15724868

申请日：2017-10-04

Applicant: Konica Minolta, Inc.

Inventor： Takaki Uemura ,  Makoto Obayashi ,  Masayuki Iijima

IPC: B41J2/45

CPC classification number: B41J2/451

Abstract: An optical print head including a light emitting member, an optical member, a detection unit, and a correction unit. The light emitting member is elongated in a longitudinal direction with light emitting elements arranged along the longitudinal direction. The optical member is elongated in the longitudinal direction with optical elements arranged along the longitudinal direction, the optical elements collecting light emitted by the light emitting elements. The detection unit detects an index value of linear expansion difference in the longitudinal direction of the light emitting member and the optical member. The correction unit uses the index value to correct an emitted light amount for each of the light emitting elements in order to offset differences in light collection efficiency caused by the linear expansion difference.

公开(公告)号：US09372432B2

公开(公告)日：2016-06-21

申请号：US14790341

申请日：2015-07-02

Applicant: KONICA MINOLTA, INC.

Inventor： So Yano ,  Yoshikazu Watanabe ,  Makoto Obayashi ,  Masayuki Iijima ,  Takaki Uemura ,  Satoshi Masuda

IPC: G03G15/00 ,  G03G15/043

CPC classification number: G03G15/043 ,  G03G15/04063

Abstract: An optical print head for forming an electrostatic latent image on a photosensitive body, including: current-driven light-emitting elements disposed in a line shape; an indicator circuit that outputs indicator current indicating light emission amounts to the light-emitting elements; and for each light-emitting element: a holding circuit that, during a main scanning period, accumulates indicator current during a sample period to generate an indicator potential and holds the indicator potential during a hold period; and a drive circuit that supplies drive current to the light-emitting element according to the indicator potential, wherein each of the sample periods is divided into writing periods, and each of the holding circuits holds the indicator potential corresponding to the holding circuit according to a total of indicator current amounts in the sample period corresponding to the holding circuit, the indicator current amounts each indicative of indicator current during one of the writing periods.

Abstract translation: 一种用于在感光体上形成静电潜像的光学打印头，包括：以线状布置的电流驱动的发光元件; 指示电路，其向所述发光元件输出指示发光量的指示电流; 并且对于每个发光元件：保持电路，其在主扫描周期期间在采样周期期间累积指示电流以产生指示电位并在保持期间保持指示电位; 以及驱动电路，其根据指示电位向发光元件供给驱动电流，其中每个采样周期被划分为写入周期，并且每个保持电路根据一个保持电路保持与保持电路相对应的指示电位 对应于保持电路的采样周期中的指示器电流量的总和，在一个写入周期期间的每个指示电流的指示器电流量。

公开(公告)号：US09358807B2

公开(公告)日：2016-06-07

申请号：US14619476

申请日：2015-02-11

Applicant: Konica Minolta, Inc.

Inventor： So Yano ,  Yoshikazu Watanabe ,  Makoto Obayashi ,  Masayuki Iijima ,  Takaki Uemura ,  Satoshi Masuda

IPC: B41J2/435 ,  B41J2/47 ,  B41J2/45

CPC classification number: B41J2/45

Abstract: An optical print head performs optical writing onto target, and includes: current-driven light-emitting elements arranged in rows in a predetermined direction; driving transistors that are each electrically series-connected with the light-emitting elements in one-to-one correspondence, and each supply a driving current to a corresponding light-emitting element; a current control unit that controls, for each light-emitting element, a driving current amount in accordance with variation in light-emitting properties of the light-emitting element that indicate relation between the driving current amount and a light amount emitted by the light-emitting element; an application unit that, upon receiving electrical power supplied from an external power source, applies application voltage to circuits each consisting of a light-emitting element and a corresponding driving transistor; and a voltage control unit that suppresses variation in divided voltage applied to each driving transistor by controlling the application unit to apply increased application voltage of the driving current amount increases.

Abstract translation: 光学打印头对目标进行光学写入，并且包括：沿预定方向排成行的电流驱动发光元件; 驱动晶体管与发光元件电连接一一对应，并且各自向对应的发光元件提供驱动电流; 电流控制单元，对于每个发光元件，根据表示驱动电流量与由发光元件发射的光量之间的关系的发光元件的发光特性的变化来控制驱动电流量， 发光元件; 应用单元，在接收到从外部电源供给的电力时，对由发光元件和相应的驱动晶体管组成的电路施加施加电压; 以及电压控制单元，其通过控制施加单元施加增加的驱动电流量的施加电压来抑制施加到每个驱动晶体管的分压的变化。

公开(公告)号：US20190275806A1

公开(公告)日：2019-09-12

申请号：US16291830

申请日：2019-03-04

Applicant: Konica Minolta, Inc.

Inventor： Takaki Uemura ,  Makoto Obayashi ,  Masayuki Iijima

IPC: B41J2/45 ,  H04N1/036

Abstract: An optical print head that performs optical writing to a photoreceptor includes: a light transmissive substrate; a light emitting unit including light emitting element groups, each of which includes two or more light emitting elements disposed on a first main surface of the substrate; a lens array including lenses that correspond one-to-one to the light emitting element groups; light detection units disposed above the second main surface of the substrate in one-to-one correspondence to the light emitting element groups and that detects the light from each of the light emitting elements; and correction unit that corrects light amounts of the light emitting elements of the light emitting element group based on detection of the light detection units.