Focus adjusting device for projection display

Details Focus adjusting device for projection display Focus adjusting device for projection display

1989-10-17

1991-08-13

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313442, G09G 104, H01J 2958, H01J 2946

Patent

active

050399233

ABSTRACT:
A focus adjusting device for projection display, comprising at least one set of 4-pole magnetic field generating means, and adjustment means for adjusting the magnetic field strength of the 4-pole magnetic field generating means so as to eliminate astigmatism caused by fabrication error and attachment error of an electron gun and a focus coil.

REFERENCES:
patent: 3504211 (1970-03-01), Takemoto et al.
patent: 4249112 (1981-03-01), McKibben
patent: 4799000 (1989-01-01), Close
"Television Engineering Handbook", Edited by Donald G. Fink, copyright .COPYRGT.1957, by McGraw-Hill Book Company, Inc.
Kanaya et al., "A Method of Correcting the Distorted Spot Shape of a Deflected Electron Probe by Means of Dynamic Focusing and Stigmator", J. Phys. E: Sci. Instrum., vol. 13, #4, Apr., 1980.
Bulyginskii et al., "Two Channel Oscilloscope Indicator with High Resolution for the Investigation of Random Processes", Instrum. and Exp. Tech. (U.S.A.), No. 3, (May-June, 1970).

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