Light pen

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G - Physics

09

G

375/38

G09G 1/00 (2006.01) G06F 3/033 (2006.01) G09G 3/00 (2006.01)

Patent

CA 1155984

LIGHT PEN ABSTRACT A light pen for detecting radiation from a display screen has a tubular body with a conical tip. The tip which fastens into the pen body includes an opaque bush which has a bore having a precisely determined diameter for transmitting light from an aperture in the tip to a light sensing device mounted in the body of the pen. The bore or interior surface of the bush has a surface formed to eliminate internal reflection.

357088

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