Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
243 words
An in-line type color picture tube apparatus, comprising: an in-line type color picture tube including a phosphor screen for displaying a substantially rectangular picture with horizontal, vertical, and diagonal axes and an in-line electron gun arranged in parallel with said horizontal axis so as to be allowed to cast electron beams on said phosphor screen to reproduce a color image; a deflection yoke disposed around the outer periphery of said tube and generating a magnetic field to give positive isotropic astigmatism to said electron beams when said electron beams are deflected along said horizontal axis, to give negative isotropic astigmatism to said electron beams when said electron beams are deflected along said vertical axis, and to give negative anisotropic astigmatism to said electron beams when said electron beams are deflected along said diagonal axis, the magnetic field generated by the deflection yoke providing the state of non-convergence along at least one of said horizontal axis, vertical axis and diagonal axis; a correction deflection element formed of a plurality of permanent magnets arranged in the vicinity of the end portion of said deflection yoke on the phosphor screen side, generating a magnetic field to give positive anisotropic astigmatism to said electron beams when said electron beams are deflected along said diagonal axes, whereby the end portions of the diagonal axes of a raster formed of the electron beams by means of an action of the deflection yoke are constricted and said non-convergence is countervailed.
Claim 2
Dependent Claim
243 words
An in-line type color picture tube apparatus, comprising: an in-line type color picture tube including a phosphor screen for displaying a substantially rectangular picture with horizontal, vertical, and diagonal axes and an in-line electron gun arranged in parallel with said horizontal axis so as to be allowed to cast electron beams on said phosphor screen to reproduce a color image; a deflection yoke disposed around the outer periphery of said tube and generating a magnetic field to give positive isotropic astigmatism to said electron beams when said electron beams are deflected along said horizontal axis, to give negative isotropic astigmatism to said electron beams when said electron beams are deflected along said vertical axis, and to give negative anisotropic astigmatism to said electron beams when said electron beams are deflected along said diagonal axis, the magnetic field generated by the deflection yoke providing the state of non-convergence along at least one of said horizontal axis, vertical axis and diagonal axis; a correction deflection element formed of a plurality of permanent magnets arranged in the vicinity of the end portion of said deflection yoke on the phosphor screen side, generating a magnetic field to give positive anisotropic astigmatism to said electron beams when said electron beams are deflected along said diagonal axes, whereby the end portions of the diagonal axes of a raster formed of the electron beams by means of an action of the deflection yoke are constricted and said non-convergence is countervailed.
Claim 3
Dependent Claim
75 words
An in-line type picture tube apparatus according to claim 1, wherein: the magnetic field generated by the deflection yoke provides substantially good convergence along said horizontal axis, provides substantial under-convergence along said vertical axis, and provides substantial non-convergence along said diagonal axes; and said correction deflection element is formed of four permanent magnets arranged in positions corresponding to the directions of the diagonal axes of said phosphor screen, whereby said under-convergence and non-convergence are countervailed.
Claim 4
Dependent Claim
105 words
An in-line type color picture tube apparatus according to claim 2, wherein: the magnetic field generated by the deflection yoke 22 provides over-convergence along said horizontal axis; and said correction deflection element further includes a pair of permanent magnets arranged in positions corresponding to the direction of the horizontal axis of said phosphor screen, said pair of permanent magnets generating a magnetic field giving positive isotropic astigmatism to said electron beams when said electron beams are deflected along said horizontal axis whereby portions of said raster in the vicinity of the end portions of said horizontal axis are horizontally extended and said over-convergence is countervailed.
Claim 5
Dependent Claim
41 words
An in-line type color picture tube apparatus according to claim 1, 2, or 3 wherein said deflection yoke consists of a horizontal deflection coil to generate a pincushion-shaped magnetic field and a vertical deflection coil to generate a barrel-shaped magnetic field.
Claim 6
Dependent Claim
81 words
An in-line type color picture tube apparatus according to claim 1, 2, or 3 wherein the magnetic field generated by said deflection yoke and correction deflection element includes a horizontal deflection magnetic field which is pincushion-shaped in the vicinity of the tube axis and barrel-shaped in a position sufficiently distant from the tube axis, and a vertical deflection magnetic field which is barrel-shaped in the vicinity of the tube axis and pincushion-shaped in a position sufficiently distant from the tube axis.