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2.光笔光笔是一种检测光信号的装置,因为它的外形象一枝普通的钢笔,故称为“光笔”。它是CAD中具有代表性的装置。 (1)结构及工作原理光笔是由笔体、透镜组、光导纤维、触扭开关、光电变换元件(光电倍增管)、放大整形电路、开关电路及金属导线组成。通过光孔被透镜聚焦到受光体上的外景范围称为视场,光导纤维把受光体的亮度传输到光电倍增管,把光亮度变为电量,随后经放大器放大和整形后送与门。当手摸触扭开关,就有讯号输出,于是与门有讯号输出。当手离开触扭开关,与
2. Light pen Light pen is a light signal detection device, because it looks like an ordinary pen, it is called “light pen.” It is a representative device in CAD. (1) Structure and working principle Light pen consists of pen body, lens group, optical fiber, touch switch, photoelectric conversion element (photomultiplier tube), amplifying and shaping circuit, switch circuit and metal wire. Through the aperture of the lens is focused by the lens to the photoreceptor on the field of view called the field of view, optical fiber to the brightness of the phototransmitter transfer to the photomultiplier tube, the brightness into electricity, and then amplified by the amplifier and shaped to send to the door. When the hand touch the touch switch, there is signal output, so the signal output with the door. When the hand left the toggle switch, with