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    • 10. 发明授权
    • Light source apparatus using flash discharge tube
    • 光源装置采用闪光放电管
    • US4404496A
    • 1983-09-13
    • US243565
    • 1981-03-13
    • Seiichi Hosoda
    • Seiichi Hosoda
    • A61B1/04G03B15/05H05B41/32
    • H05B41/325G03B15/05G03B2215/0503G03B2215/0585G03B2215/0592
    • A light source apparatus which comprises a flash discharge tube for illuminating a foreground subject, a switching element connected in series with the flash discharge tube, a light receiving circuit for photoelectrically converting light reflected by a foreground subject to produce a signal corresponding to the amount of light reflected from the received foreground subject and a decision circuit for producing an interruption signal for rendering the switching element non-conductive with partially as a function of the output signal of the light receiving circuit. A correction circuit for producing a correction signal in accordance with a preset film sensitivity is further provided. The decision circuit produces the interruption signal when the difference between the output signals of the correction circuit and light receiving circuit is reduced to zero.
    • 一种光源装置,包括用于照射前景物体的闪光放电管,与闪光放电管串联连接的开关元件,用于光电转换由前景物体反射的光的光接收电路,以产生对应于 从接收到的前景对象反射的光和用于产生用于使开关元件不导通的中断信号的判定电路,部分地作为光接收电路的输出信号的函数。 还提供了用于根据预设的胶片感光度产生校正信号的校正电路。 当校正电路和光接收电路的输出信号之间的差减小到零时,判定电路产生中断信号。