Browse Prior Art Database

Feedback Positioning Control

IP.com Disclosure Number: IPCOM000074067D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Chapman, DW: AUTHOR

Abstract

For some applications, it is desirable to position two or more light beams in the same flying-spot store. This can be done if the light beams contain different color components. Consider a flying-spot store in which the CRT has two electron guns with independently controllable deflection systems. These beams can be directed to different positions on, for example, the same memory chips if the CRT phosphor emits two colors.

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Feedback Positioning Control

For some applications, it is desirable to position two or more light beams in the same flying-spot store. This can be done if the light beams contain different color components. Consider a flying-spot store in which the CRT has two electron guns with independently controllable deflection systems. These beams can be directed to different positions on, for example, the same memory chips if the CRT phosphor emits two colors.

For example, let the phosphor be a mixture of two different phosphors. By using selective bandpass color separating filters in the light-detection circuitry of the flying-spot store servo system, the positioning of the beams can be independently controlled, as shown, for a single channel of a multichannel store. Each channel can independently operate in the same way. Shown is the CRT 1, spots S(1) and S(2), objective lens 2, servo chip 3, condenser lens 4, beam splitter 5, red pass filter 6, blue pass filter 7, photodiode 8 providing feedback control signal to S(2), and photodiode 9 providing feedback control signal to S(1).

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