Browse Prior Art Database

Light Pen

IP.com Disclosure Number: IPCOM000078510D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Bilsback, MS: AUTHOR

Abstract

In conventional light pens used with a cathode-ray tube (CRT) display, light pens are employed in item or items displayed on the cathode-ray tube for processing, by an associated data processor operating in an interactive terminal mode. In manipulating the light pen, the operator holds the pen, points to the desired area on the CRT face and pushes the pen to cause an attention or detect signal to be generated.

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Light Pen

In conventional light pens used with a cathode-ray tube (CRT) display, light pens are employed in item or items displayed on the cathode-ray tube for processing, by an associated data processor operating in an interactive terminal mode. In manipulating the light pen, the operator holds the pen, points to the desired area on the CRT face and pushes the pen to cause an attention or detect signal to be generated.

An improved light pen combining these features within the pen assembly comprises an outside plastic sleeve 3 and strain relief member 15, which is tapered to conform to the dimensions of coaxial cable 5 to substantially eliminate relative movement between the light pen and cable, as compared to conventional light pen assemblies. The inner portion 6 of the pen is plug-shaped to permit relative motion with respect to outer plastic sleeve 3.

The tip 7 of the pen, which includes a conical lens assembly, not shown, when pushed against the face of the CRT, causes a subminiature snap action switch 9, shown in the closed position, to be actuated which provides a combination of functions. It causes a detect signal to be generated, provides a spring-action return for the pen tip, provides an audible click to indicate to the operator that the switch has been actuated, and requires no adjustment. Mounted within the center portion 6 of the pen assembly is a miniature printed- circuit card assembly, not shown in the drawings, which contains the necessary photoe...