公开(公告)号：US3680078A

公开(公告)日：1972-07-25

申请号：US3680078D

申请日：1969-12-23

Applicant: IBM

Inventor： BASKIN HERBERT B ,  BELADY LASZLO A ,  EVANGELISTI CARLO J ,  MORSE STEPHEN P

IPC: G06F3/038 ,  G06F3/14

CPC classification number: G06F3/0383

Abstract: A light pen arrangement is described wherein the light pen has three degrees of freedom, viz. two-dimensional translation in the (X,Y) plane of a cathode ray tube screen and rotation about the projection of its own longitudinal axis to the normal of the screen. To sense the angular position of the light pen, at least two independent light sensitive elements, i.e., fiber optic bundles are required, the latter being suitably provided by dividing the bundle of fiber optics emerging from a single light pen into at least two separate groups and having photosensitive transducer respectively associated with each of the separate groups. When the light pen is placed on the screen and its presence there is sensed, an (X,Y) value pair is stored for the location of each light sensitive area of the light pen, i.e., each of the aforementioned separate fiber optic groups. The storing is accomplished by having an electron beam draw lines or points in each light sensitive area and, receiving in response thereto, interrupts for points or lines in the field of view of each fiber optic group, the (X,Y) coordinate of each point or line causing an interrupt and the fiber optic group that picked up the interrupt is now known to the computer or other control arrangement controlling the cathode ray tube. The computer or control arrangement can then compute the (X,Y) location of the light pen as the centroid of the individual areas and the angular position of the pen.

Abstract translation: 描述了一种光笔布置，其中光笔具有三个自由度，即， 在阴极射线管屏幕的（X，Y）平面上进行二维平移，并且围绕其自身纵轴的投影相对于屏幕的法线旋转。 为了感测光笔的角度位置，需要至少两个独立的光敏元件，即光纤束，后者通过将从单个光笔出射的光纤束分成至少两个分开的组来适当地提供 并具有分别与每个单独组相关联的光敏传感器。 当光笔被放置在屏幕上并且其中存在时，存储用于光笔的每个光敏区域（即上述各个光纤组）的位置的（X，Y）值对。 存储是通过在每个光敏区域中具有电子束绘制线或点来实现的，并且响应于此而接收每个光纤组的视场中的点或线的中断，每个光纤组的（X，Y）坐标 导致中断的点或线，拾取中断的光纤组现在已知到控制阴极射线管的计算机或其他控制装置。 计算机或控制装置然后可以计算光笔的（X，Y）位置作为各个区域的重心和笔的角位置。