公开(公告)号：US10481519B2

公开(公告)日：2019-11-19

申请号：US15704517

申请日：2017-09-14

Applicant: Konica Minolta, Inc.

Inventor： So Yano ,  Yoshikazu Watanabe ,  Sotaro Yokota

IPC: G03G15/04 ,  G03G15/043

Abstract: A print head includes: current-driven non-single crystal light emitting elements arranged in a line; thin film transistors that are provided in one-to-one correspondence with the light emitting elements and each supplies a driving current to a corresponding one of the light emitting elements; a detector that detects, when one of the light emitting elements corresponding to one of the thin film transistors emits light, an output voltage of the one of the thin film transistors; and a hardware processor that determines a control voltage to be applied to each of the thin film transistors when next light is emitted according to the output voltage of the one of the thin film transistors detected by the detector and a driving current to be supplied by each of the thin film transistors to cause each of the light emitting elements to emit light with a target light amount.

公开(公告)号：US10469693B2

公开(公告)日：2019-11-05

申请号：US15937265

申请日：2018-03-27

Applicant: KONICA MINOLTA, INC.

Inventor： Yoshikazu Watanabe ,  So Yano ,  Sotaro Yokota

IPC: B41J2/45 ,  G02B27/09 ,  G06K15/12 ,  H04N1/03 ,  G03G15/04 ,  G09G3/3233 ,  H04N1/028

Abstract: An optical PH includes: a plurality of current-driven light emitting elements that are arranged in a line-shaped region; a controller that outputs a control voltage instructing an amount of a drive current to be supplied to each of the light emitting elements; and a plurality of drivers that correspond one-to-one with the light emitting elements, and each supply the drive current to a corresponding one of the light emitting elements, wherein the drivers each operate as one of: a high-voltage referring driver that supplies the drive current according to a voltage difference between the control voltage and a reference voltage higher than the control voltage; and a low-voltage referring driver that supplies the drive current according to a voltage difference between the control voltage and a reference voltage lower than the control voltage.

公开(公告)号：US10379459B2

公开(公告)日：2019-08-13

申请号：US15945873

申请日：2018-04-05

Applicant: KONICA MINOLTA, INC.

Inventor： Yoshikazu Watanabe ,  So Yano ,  Sotaro Yokota

IPC: G03G15/043 ,  G03G15/04 ,  G03G15/01 ,  G03G15/00 ,  G03B27/00 ,  B41J2/45

Abstract: An image forming device includes: element arrays each including light emitting elements arranged in main scanning direction, the arrays being arranged in sub scanning direction; a photoreceptor whose surface moves relative to the light emitting elements in the sub scanning direction; a controller outputting control voltage instructing light emission amount for each light emitting element; and drivers each supplying drive current to a corresponding light emitting element according to the control voltage, thus causing the light emitting element to emit light to expose the moving surface of the photoreceptor. Intervals L between the arrays satisfy (D/2)×(V/F)−((V/F)×0.1)≤L≤(D/2)×(V/F)+((V/F)×0.1) where F expresses frequency of AC noise to be superimposed on the control voltage, V expresses system speed of the surface of the photoreceptor moving relative to the light emitting elements, and D is an odd number.

公开(公告)号：US20180314184A1

公开(公告)日：2018-11-01

申请号：US15945873

申请日：2018-04-05

Applicant: KONICA MINOLTA, INC.

Inventor： Yoshikazu Watanabe ,  So Yano ,  Sotaro Yokota

IPC: G03G15/04 ,  G03G15/043 ,  G03G15/00 ,  G03G15/01

CPC classification number: G03G15/04054 ,  B41J2/45 ,  G03B27/00 ,  G03G15/011 ,  G03G15/043 ,  G03G15/5004 ,  G03G2215/0409

Abstract: An image forming device includes: element arrays each including light emitting elements arranged in main scanning direction, the arrays being arranged in sub scanning direction; a photoreceptor whose surface moves relative to the light emitting elements in the sub scanning direction; a controller outputting control voltage instructing light emission amount for each light emitting element; and drivers each supplying drive current to a corresponding light emitting element according to the control voltage, thus causing the light emitting element to emit light to expose the moving surface of the photoreceptor. Intervals L between the arrays satisfy (D/2)×(V/F)−((V/F)×0.1≤L≤(D/2)×(V/F)+((V/F)×0.1) where F expresses frequency of AC noise to be superimposed on the control voltage, V expresses system speed of the surface of the photoreceptor moving relative to the light emitting elements, and D is an odd number.

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。