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Browse Prior Art Database

Data Reduction System - Optical Positioning

IP.com Disclosure Number: IPCOM000097779D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Kamentsky, LA: AUTHOR

Abstract

A scanning beam of light, such as that generated by a flying spot scanner, is accurately directed toward a target by the use of a closed loop control system of the type in the circuit. Portions of the light beam from the cathode ray tube 1 are directed through lenses 2 and vertical and horizontal coarse gratings 3 and vernier gratings 4 toward photomultipliers 5.

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Data Reduction System - Optical Positioning

A scanning beam of light, such as that generated by a flying spot scanner, is accurately directed toward a target by the use of a closed loop control system of the type in the circuit. Portions of the light beam from the cathode ray tube 1 are directed through lenses 2 and vertical and horizontal coarse gratings 3 and vernier gratings 4 toward photomultipliers 5.

A reference signal representative of the beam intensity is generated by another photomultiplier 6 and combined with the outputs of the grating photomultipliers 5 in difference amplifiers 7. A control circuit 8 utilizes these signals and stored signals representative of the intended position of the light beam to generate appropriate deflection voltages for the cathode ray tube.

The coarse gratings 3 are shown (lower left) to contain opaque areas 9 whose terminating edges coincide with the leading edges of every tenth opaque area 10 on the vernier grating 4. The beam is moved at a high speed. The coarse grating signals are used in the control circuit until the beam passes the leading edge of the appropriate opaque area 9 on the coarse grating. This causes the control circuit 8 to decelerate the beam to a lower velocity and the vernier grating signals are used for exact positioning.

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