FOCUS DETECTION APPARATUS, METHOD OF DRIVING THE SAME AND CAMERA SYSTEM
    51.
    发明申请
    FOCUS DETECTION APPARATUS, METHOD OF DRIVING THE SAME AND CAMERA SYSTEM 有权
    聚焦检测装置,其驱动方法和相机系统

    公开(公告)号:US20080002958A1

    公开(公告)日:2008-01-03

    申请号:US11751974

    申请日:2007-05-22

    CPC classification number: G03B13/36 G02B7/346

    Abstract: A low cost and high speed AF sensor is realized by increasing AF speed without providing a sensor dedicated for a large de-focusing AF. The AF sensor has two sensors each including a plurality of photoelectric conversion elements and detects a focus based on signals read from the sensors. The two sensors each includes a plurality of linear sensors 11 to 13. The two sensors each has a plurality of accumulation controlling circuits (PB detection circuits 14 to 16 and accumulation decision circuits 17 to 19) for controlling the accumulation time of the photoelectric conversion elements and a plurality of scanning circuits (shift registers 21 to 23) for reading out output signals from the photoelectric conversion elements. The AF sensor has a first mode in which the accumulation time of each linear sensor in the two sensors is independently controlled to independently read a signal output and a second mode in which the accumulation time of the linear sensors in the two sensors is collectively controlled to read a signal output.

    Abstract translation: 通过增加AF速度实现低成本和高速AF传感器,而不需要提供专用于大型去焦AF的传感器。 AF传感器具有两个传感器,每个传感器包括多个光电转换元件,并且基于从传感器读取的信号来检测焦点。 两个传感器各自包括多个线性传感器11至13.两个传感器各自具有多个累积控制电路(PB检测电路14至16和累积判定电路17至19),用于控制光电转换元件的累积时间 以及用于读出来自光电转换元件的输出信号的多个扫描电路(移位寄存器21〜23)。 AF传感器具有第一模式,其中独立地控制两个传感器中的每个线性传感器的累积时间,以独立地读取信号输出和第二模式,其中两个传感器中的线性传感器的累积时间被集中控制到 读取信号输出。

    IMAGE FORMING APPARATUS
    57.
    发明申请

    公开(公告)号:US20200033767A1

    公开(公告)日:2020-01-30

    申请号:US16451512

    申请日:2019-06-25

    Abstract: An image forming apparatus includes a resistive heat generator, a temperature detector, and a power controller that detects a temperature-resistance property of the resistive heat generator before the resistive heat generator is used when the resistive heat generator is removably installed. The power controller obtains power supplied to the resistive heat generator and a change in a temperature of the resistive heat generator, that is detected by the temperature detector, while the power controller supplies the power at a predetermined power duty cycle for adjustment to the resistive heat generator. The power controller calculates the temperature-resistance property of the resistive heat generator based on the power and the change in the temperature that are obtained. The power controller adjusts a power duty cycle at which the power is supplied to the resistive heat generator in use of the resistive heat generator, based on the temperature-resistance property.

    IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD

    公开(公告)号:US20190271927A1

    公开(公告)日:2019-09-05

    申请号:US16290358

    申请日:2019-03-01

    Abstract: An image forming apparatus including a developing device and a fixing device is provided. The fixing device includes a fixing rotator having a fixing surface, an opposing rotator opposing the fixing rotator to form a nip portion therebetween, and a fixing surface reformer having an abutting layer to abut the fixing surface. The abutting layer contains abrasive grains having an average grain size of 2.0-6.5 μm on a surface which abuts the fixing surface. The toner comprises a crystalline polyester resin and exhibits G′ (storage elastic modulus) of 1.0×107 Pa or lower at 70° C. in a temperature rising in a viscoelasticity measurement, G′ of 1.0×107 Pa or higher at 70° C. in a temperature falling in the viscoelasticity measurement, and an endothermic peak indicating an amount of heat absorption of from 2.0 to 8.0 J/g, derived from the crystalline polyester resin, in a first temperature rising in DSC.

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