Browse Prior Art Database

CRT Optical Tunnel Array

IP.com Disclosure Number: IPCOM000092580D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Dalton, JJ: AUTHOR [+4]

Abstract

As data processing systems increase in size and complexity, there is a corresponding growth of associated control and test panels. One alternative for the conventional control panel substitutes a cathode ray tube display and a light pen for the neon indicators and toggle switches. The status of various circuits or parameters can be indicated on a film overlay on the face of the tube with the indicators appropriately labeled. Since the conventional cathode ray tube has a convex face, the requirement for a film overlay having a concave shape and the parallax problem associated with cathode ray tube display requires a solution.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 78% of the total text.

Page 1 of 2

CRT Optical Tunnel Array

As data processing systems increase in size and complexity, there is a corresponding growth of associated control and test panels. One alternative for the conventional control panel substitutes a cathode ray tube display and a light pen for the neon indicators and toggle switches. The status of various circuits or parameters can be indicated on a film overlay on the face of the tube with the indicators appropriately labeled. Since the conventional cathode ray tube has a convex face, the requirement for a film overlay having a concave shape and the parallax problem associated with cathode ray tube display requires a solution.

A mask having a plurality of uniformly displaced circular apertures or tunnels has a concave inner surface. The latter is adapted to fit over the viewing surface of a cathode ray tube and has a cylindrical outer face. The mask effectively provides a lens effect by converting the convex to a cylindrical surface. The tunnel array layout provides the desired pattern. The array comprises a plurality of uniformly positioned openings which coincide with the dot pattern generated by the associated cathode ray tube. By proper selection of tunnel diameter, length and separation, light from a wide or defocused beam can be radiated through the corresponding tunnel, thus eliminating the parallax problem on the display.

The tunnels can have a glossy surface to reduce light absorption loss. Alternatively, the reflectivity of the in...