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    • 2. 发明申请
    • Authentication Device And Authentication Method
    • 验证设备和验证方法
    • US20100278397A1
    • 2010-11-04
    • US12675207
    • 2008-08-27
    • Takeo TobeKenzo MizunoTetsuji TsujiIsao WatanabeIsao KikuchiTadahito Watakai
    • Takeo TobeKenzo MizunoTetsuji TsujiIsao WatanabeIsao KikuchiTadahito Watakai
    • G06T7/00
    • G06K9/00033A61B5/117A61B5/1171A61B5/1172A61B5/489A61B5/6826A61B5/6838G06K9/2027G06K2009/0006G06K2009/00932
    • An authentication can be carried out with high accuracy even when there is a change in an amount of incident light, the air temperature, the body temperature, or a manner to place a finger on a scanner.An authentication apparatus includes: a light source that emits an infrared light beam onto a finger; image pick-up means 8 that picks up an image of the finger by using a transmitted light beam, and thus outputs an image signal; low-frequency brightness component extracting means 61 that extracts a low-frequency brightness component signal from the image signal; middle-frequency brightness component extracting means 62 that extracts a middle-frequency brightness component signal from the image signal; correction means 63 that corrects the middle-frequency brightness component signal using the low-frequency brightness component signal; quaternary-value converting means 64 that converts the corrected middle-frequency brightness component signal into quaternary values such that the quaternary values are distributed at a predetermined ratio; storage means 7 that stores a quaternary-valued image obtained by the quaternary value conversion; correlation coefficient calculating means 65 that calculates a correlation coefficient between a quaternary-valued evaluation image as an object of evaluation obtained by the quaternary value conversion, and a quaternary-valued registered image beforehand stored in the storage means, by using a pattern matching method based on a normalized correlation method; and judgment means 66 that judges whether or not the quaternary-valued evaluation image and the quaternary-valued registered image are images picked up from the same finger on a basis of the correlation coefficient.
    • 即使当入射光量,空气温度,体温变化,或者将手指放置在扫描仪上的方式时,也能够高精度地进行认证。 认证装置包括:将红外光束发射到手指上的光源; 图像拾取装置8,其通过使用透射光束拾取手指的图像,从而输出图像信号; 低频亮度分量提取装置61,从图像信号中提取低频亮度分量信号; 中频亮度分量提取装置62,从图像信号中提取中频亮度分量信号; 校正装置63,其使用低频亮度分量信号校正中频亮度分量信号; 四进制值转换装置64,其将校正的中频亮度分量信号转换为四进制值,使得四进制值以预定比例分布; 存储装置7,存储通过四次值转换获得的四值值图像; 相关系数计算装置65,其通过使用基于模式匹配方法来计算作为通过四进制值转换获得的评估对象的四元值评估图像和预先存储在存储装置中的四值注册图像之间的相关系数, 采用归一化相关法; 以及判断装置66,其判断四值估值图像和四值值登记图像是否是基于相关系数从同一手指拾取的图像。
    • 6. 发明申请
    • FIXING DEVICE AND IMAGE FORMING APPARATUS
    • 固定装置和图像形成装置
    • US20120301162A1
    • 2012-11-29
    • US13479510
    • 2012-05-24
    • Kosuke SASAKINaoki OhashiIsao WatanabeYasuhiro IshiharaHiroyuki Yoshikawa
    • Kosuke SASAKINaoki OhashiIsao WatanabeYasuhiro IshiharaHiroyuki Yoshikawa
    • G03G15/20
    • G03G15/2042
    • A fixing device includes a temperature measuring unit, configured to measure the temperature in regions that extend partially along the outer surface of a heating rotating body, which includes a resistance heating layer, in the circumferential direction and are aligned in the direction of the axis of rotation of the heat rotating body, and a control unit configured to sample temperatures, measured by the temperature measuring unit in each of the regions, over the entire outer surface of the heating rotating body in the circumferential direction by causing the heating rotating body to rotate while supplying a predetermined amount of power to the resistance heating layer, and to determine whether an abnormality has occurred in the resistance heating layer based on the difference between the maximum temperature and the minimum temperature among the sampled temperatures in each region.
    • 定影装置包括温度测量单元,该温度测量单元被配置为测量在包括电阻加热层的加热旋转体的外表面部分沿着圆周方向延伸并且沿轴向方向 热旋转体的旋转以及控制单元,其被配置为通过使加热旋转体旋转而在周向上在加热旋转体的整个外表面上测量由各个区域中的温度测量单元测量的温度 同时向电阻加热层提供预定量的电力,并且基于每个区域中的采样温度之间的最大温度和最低温度之间的差异来确定电阻加热层中是否发生异常。
    • 9. 发明申请
    • FIXING DEVICE AND IMAGE FORMATION APPARATUS
    • 固定装置和图像形成装置
    • US20120076521A1
    • 2012-03-29
    • US13236692
    • 2011-09-20
    • Yasuhiro ISHIHARAHiroyuki YoshikawaKosuke SasakiIsao Watanabe
    • Yasuhiro ISHIHARAHiroyuki YoshikawaKosuke SasakiIsao Watanabe
    • G03G15/20
    • G03G15/2039G03G15/55G03G15/553
    • A fixing device for fixing an unfixed toner image on a recording sheet by passing the recording sheet through a fixing nip and applying heat and pressure to the recording sheet, the fixing device comprising: a heater including a resistance heater part and a supporting member, the resistance heater part having a positive resistance-temperature characteristic in a temperature range above a predetermined level, and the supporting member being insulative and supporting the resistance heater part such that the resistance heater part applies heat to the recording sheet; a current detector detecting a current supplied to the resistance heater part; and an abnormality determiner determining whether the resistance heater part has an abnormality, based on an initial current detected by the current detector at a predetermined time after a beginning of power supply to the resistance heater part and before the temperature of the resistance heater part reaches the predetermined level.
    • 一种定影装置,用于通过使记录片材通过定影辊隙将未定影的调色剂图像定影在记录片材上,并将热和压力施加到记录片材上,该定影装置包括:加热器,包括电阻加热器部分和支撑部件, 电阻加热器部件在高于预定水平的温度范围内具有正电阻温度特性,并且所述支撑部件绝缘并支撑所述电阻加热器部分,使得所述电阻加热器部件向所述记录片材加热; 电流检测器,检测供应到电阻加热器部分的电流; 以及异常判定器,基于在电阻加热器部分的电力供应开始之后的预定时间和电阻加热器部分的温度达到之前由电流检测器检测到的初始电流来确定电阻加热器部分是否具有异常 预定水平。