Browse Prior Art Database

Projected Display Measurement

IP.com Disclosure Number: IPCOM000095805D
Original Publication Date: 1964-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Kern, RW: AUTHOR [+2]

Abstract

In the case of displays, on cathode ray tubes, e. g., radar returns, it is frequently required to measure directly the true size of displayed objects as well as actual distances between viewed objects.

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Projected Display Measurement

In the case of displays, on cathode ray tubes, e. g., radar returns, it is frequently required to measure directly the true size of displayed objects as well as actual distances between viewed objects.

Such measurements are made by projecting reticle images of known dimensions through the rear of the CRT onto the viewing screen. By the use of a zoom-type objective lens system the images can be blown up or reduced to fit a given measurement with direct readout provided by appropriate calibration of the lens system. Reticles in the form of circles are used to obtain size determination and a grid reticle for relative distances between viewed objects.

Where the display is in the form of a photograph transparency, the photograph is projected onto a screen in a precisely known magnification ratio. The reticle images are then overlaid on the same screen via a zoom-type objective lens system and a beam-splitter with measurements obtained as before.

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