H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.13
H01J 29/58 (2006.01) H01J 29/48 (2006.01) H01J 29/56 (2006.01)
Patent
CA 1168288
ABSTRACT OF THE DISCLOSURE A novel electron gun for use in television cathode ray tubes of the direct view or projection type is disclosed. The cathode ray tube has associated therewith a power supply for developing a predetermined pattern of operating voltages including first and second adjustable voltages. The electron gun has electrodes aligned on an axis for receiving the operating voltages to produce a focused beam of electrons. The electron gun comprises lower end means for generating an electron beam having a crossover. The beam expands in a prefocusing section following the crossover and the outer rays of the expanding beam define a half-angle with respect to the axis. The gun also comprises main focus lens means for receiving the expanding beam and focusing the beam to form a beam spot of minimum size at a predetermined distance from the gun. The main focus lens means has at least a focusing electrode for receiving the first adjustable voltage for focusing the beam spot. The main focus lens means, by its inherent characteristics, is capable of focusing a minimum beam spot whose size is a function of the beam half-angle. The gun according to the invention is characterized by having at least one-half angle control element located in the region between the lower end means and the focus lens means. The control element according to the invention receives the second adjustable voltage to generate a half-angle control field of adjustable strength. Voltage adjustment means are provided for adjusting the second adjustable voltage such that upon adjustment of the voltage adjustment means to increase the strength of the half-angle control field, the half-angle is increased. Conversely, upon adjustment of the voltage adjustment means to decrease the strength of the field, the half-angle is decreased. As a result, an optimum half angle providing a minimum beam spot size is attainable.
360110
Macrae & Co.
Zenith Radio Corporation
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