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    • 6. 发明授权
    • Endoscopic apparatus
    • 内窥镜装置
    • US06456317B1
    • 2002-09-24
    • US09198850
    • 1998-11-24
    • Kanichi MatsumotoKatsuyuki SaitoMakoto TsunakawaAkihiko MochidaKotaro OgasawaraShinji YamashitaNoboru KusamuraWataru OhnoKuniaki KamiHideki Tashiro
    • Kanichi MatsumotoKatsuyuki SaitoMakoto TsunakawaAkihiko MochidaKotaro OgasawaraShinji YamashitaNoboru KusamuraWataru OhnoKuniaki KamiHideki Tashiro
    • H04N318
    • H04N5/2354H04N5/2352H04N9/045H04N2005/2255
    • In an endoscopic apparatus, when the dynamic range expansion on/off switch is turned on, a CPU changes a switch from one contact over to another. Red, green, and blue digital signals sent from a knee and gamma circuit are output to respective dynamic range expanding circuits. Thus, the dynamic ranges for the digital signals are expanded. On the other hand, when the CPU changes another switch from one contact over to the other, a light adjustment signal output from an operational amplifier is then driven to a level causing a diaphragm in a light source unit to open further. Consequently, an increased amount of illumination light is supplied to the incident end of a light guide running through an endoscope. Thus, when a dynamic range is expanded, a halation effect will not occur in imaging of an object located at a point near the distal end of the endoscope. Moreover, insufficiency of illumination light will not occur in the imaging of an object located at a point far from the endoscope distal end. The dynamic range can therefore be expanded efficiently. An endoscopic image of the interior of a body cavity can be viewed with the body cavity set to a desired brightness level all points ranging from a near point to a far point within the body cavity.
    • 在内窥镜装置中,当动态范围扩大开/关开关打开时,CPU将开关从一个触点切换到另一个触点。 从膝盖和伽马电路发送的红色,绿色和蓝色数字信号被输出到相应的动态范围扩展电路。 因此,扩展了数字信号的动态范围。 另一方面,当CPU将另一个开关从一个触点切换到另一个触点时,从运算放大器输出的调光信号被驱动到导致光源单元中的隔膜进一步打开的水平。 因此,向穿过内窥镜的导光体的入射端供给增加量的照明光。 因此,当动态范围扩大时,在位于内窥镜远端附近的物体的成像中不会发生晕影效果。 此外,在位于远离内窥镜远端的点的物体的成像中不会发生照明光的不足。 因此可以有效地扩展动态范围。 体腔内部的内窥镜图像可以被观察到,其体腔被设置为期望的亮度级别,其范围从体腔内的近点到远点。