Abstract: A light pen for use in data imput to data processing equipment, has an adjustable tip assembly wherein the tip switch sensitivity and tactile feel or feedback to the user can be varied according to user preferences and particular applications. In one mode, the pen can be set for a normal, longer throw of the switch, so as to provide and require a definite touch or push action on the part of the user in order to actuate the switch. In another mode, the tip switch characteristics can be adjusted for a very light feel, so as to permit delicate input such as handwriting or drawing. The tip assembly includes an adjustable stop member provided within the tip housing, to provide a variable limit for the travel of the tip structure.

Abstract: A cordless light pen for use with a cathode ray tube display screen as a data input for a digital computer. Contained within the exterior barrel of the pen is a depressible tip having a core made from a plastic which has been treated and whose index of refraction causes light entering in a direction parallel to the longitudinal axis of the core to pass through. The other end of the tip is operatively disposed relative to a light sensor. Also contained within the barrel of the cordless pen is a circuit card containing circuitry for amplifying, filtering and shaping the signals from the light sensor and to discriminate between signals due to the CRT sweep in the field of view of the tip and ambient noise. The so-called "hits" occasioned by the passage of the CRT beam past the tip member when it is depressed cause an IR LED to be energized to produce a directed beam of IR energy. The IR energy is transmitted to a receiver positioned to detect it, provided the light pen is held on the face of the CRT screen.