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Browse Prior Art Database

Modulation Grids for Cathode Ray Tube Data Processor

IP.com Disclosure Number: IPCOM000094055D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Gaffney, JE: AUTHOR

Abstract

This grid apparatus is for use within cathode ray tubes. It is utilized to process data images by modulating electron beams before the beams strike an output screen. By using these grids and associated control circuitry, many functions such as cross-correlations, filtering, addition, multiplication and others can be achieved.

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Modulation Grids for Cathode Ray Tube Data Processor

This grid apparatus is for use within cathode ray tubes. It is utilized to process data images by modulating electron beams before the beams strike an output screen. By using these grids and associated control circuitry, many functions such as cross-correlations, filtering, addition, multiplication and others can be achieved.

Grid A and grid B are positioned within a cathode ray tube not shown. Electron beams are generated by a source, not shown, and are directed in parallel paths toward grids A and B. These contain a plurality of chambers A(i, j) and B(i, j), respectively. The A(i, j) chambers are aligned with the B(i, j) chambers so that, for example, a beam passing through the A(1, 3) chamber then passes through B(1, 3) chamber.

Each A(i, j) chamber in grid A is connected to a control circuit by an electrical connection CA(i, j). For example the CA(1, 1) line connects to the A(1,1) chamber, the CA(1,3) to A(1,3) and so on. In a similar manner a B(i, j) is connected to the control circuit by a CB(i, j).

In operation, the control circuit varies the voltage potential on the A(i, j) chambers by the C(i, j) lines. The variation in voltage potential on the A(1,3) chamber modulates the energy in the electron beam passing through it. In a similar manner, the B(1, 3) chamber modulates the same electron beam according to the variation in the voltage potential as caused by the control circuit. All the other electron beams passing through the respective chambers in grids A and B are independently modulated in the same manner as is the beam passing through A(1,3)and B(1,3).

When the electron beams emerging from Grid B strike a screen, not shown, of the cathode...