CRT lensing electrodes having apertures defined by tapered sidewalls
AssigneeNorth American Philips Consumer Electronics Corp.
InventorDonald L. Say
Life of this patent
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Abstract
The invention pertains to the achievement of improved lensing means employed in compact plural beam in-line CRT electron gun assemblies resulting in small round spot sizes on the screen. Such is effected by forming cooperating tapered apertures in a low potential lensing electrode and similar facing apertures in an adjacent high potential lensing electrode. The larger openings of the two sets of facing tapered apertures provide lenses of larger than normal dimensions. Additionally, partial overlapping of the apertures permits even larger lenses in the available electrode areas, thereby effecting further improved lensing of the beams.
Claims24
In an in-line electron gun structure for a color cathode ray tube, a lensing arrangement in the final low potential lensing and high potential lensing electrodes comprising:
- a first lensing structure in the forward portion of the low potential lensing electrode, such structure having three in-line linearly tapered apertures of substantially truncated volumetric configuration, each aperture having beam-exiting front and smaller dimensioned beam-entering rear openings, the front and rear openings being connected by sloping sidewalls;
- and
- a second lensing structure in the rear portion of the high potential lensing electrode in adjacent, facing relationship with the first structure, such second structure having three in-line linearly tapered apertures of substantially truncated volumetric configuration, each aperture having beam-entering rear and smaller dimensioned beam-exiting front openings, the front and rear openings being connected by sloping sidewalls.
In an in-line electron gun structure for a color cathode ray tube, a lensing arrangement in the final low potential lensing and high potential lensing electrodes comprising:
- a first lensing structure in the forward portion of the low potential lensing electrode, such structure having three in-line tapered apertures of substantially truncated spherical configuration, each aperture having beam-exiting front and smaller dimensioned beam-entering rear openings, the front and rear openings being connected by sloping sidewalls;
- and
- a second lensing structure in the rear portion of the high potential lensing electrode in adjacent, facing relationship with the first structure, such second structure having three in-line tapered apertures of substantially truncated spherical configuration, each aperture having beam-entering rear and smaller dimensioned beam-exiting front openings, the front and rear openings being connected by sloping sidewalls.
In an in-line electron gun structure for a color cathode ray tube, a lensing arrangement in the final low potential lensing and high potential lensing electrodes comprising:
- a first lensing structure in the forward portion of the low potential lensing electrode, such structure having three in-line linearly tapered apertures of substantially truncated volumetric configuration, each aperture having beam-exiting front and smaller dimensioned beam-entering rear openings, the front and rear openings being connected by sloping sidewalls, a portion of the sidewall of each aperture intersects with a portion of the sidewall of an adjacent aperture to form an inwardly sloping arcuate rounded saddle along the region of intersection, such structure resulting from the partial overlapping of geometric constructions of the volumetric configurations;
- and
- a second lensing structure in the rear portion of the high potential lensing electrode in adjacent, facing relationship with the first structure, such second structure having three in-line linearly tapered apertures of substantially truncated volumetric configuration, each aperture having beam-entering rear and smaller dimensioned beam-exiting front openings, the front and rear openings being connected by sloping sidewalls, a portion of the sidewall of each aperture intersects with a portion of the sidewall of an adjacent aperture to form an inwardly sloping arcuate rounded saddle along the region of intersection, such structures resulting from the partial overlapping of geometric constructions of the volumetric configurations.
Dependencies are inferred from the claim text.