The phrase "light pen" is correct and can be used in written English.
It refers to a type of input device used for computers or other electronic devices that allows the user to select or draw on the screen by pointing with a light or laser. Example: "She used a light pen to quickly navigate through the presentation slides during the meeting."
Sketchpad displayed graphics on the CRT display, and a light pen was used to manipulate the line objects, much like a modern computer mouse.
The system's functionality was heavily electrical and used electronic pulses shared between the photoelectric cell of the light pen and an electronic gun fired from the CRT.
One of the first acquisition methods to enable pen-based user input to computers has been the so-called light pen technique.
It also featured ground-breaking user interfaces: a CRT display with results plotted on airspace maps, and a "light pen" that operators could use to write data on the screen.
Coded line work can be displayed on a cathode-ray tube and corrected with a light pen, but it is much simpler to check and correct the manuscript or finished drawing.
(She made it by sitting in front of a camera set for a long exposure and drawing in the air with a light pen, a technique borrowed from Man Ray).
Together with a colleague at SRI, William English, he eventually perfected a variety of input devices that became common including joysticks, light pens, and track balls.
Then, most new machines are short of "peripherals" — add-ons such as disc drives for storing programs, joysticks, printers, speech synthesizers, light pens and all the rest of the paraphernalia.
L. Earnest, The first cursive handwriting recognizer needed a spelling checker and so did the rest of the world, At MIT in the period 1959-63 I developed the first cursive handwriting recognizer, which included the first use of light pens as drawing and writing instruments and also included the first spelling checker.
As the information continued to flow in, I watched them draw on their maps with light pens, painstakingly adjusting the contours of temperature gradients produced by the computers — 15 miles westward over the Mississippi Delta or 30 miles northward into Lake Erie — in order to bring them one step closer to accuracy.
The opening, "Let There Be More Light", penned by Waters, continues the space rock approach established by Barrett.
