| 摘要 |
PURPOSE:To eliminate discrepancy of position of a shadow mask by setting the longitudinal direction of a superhigh-pressure mercury lamp in parallel to the vertical direction of a face panel and tilting the longitudinal direction of the slit of a slit plate covering the lamp by a prescribed angle in relation to the horizontal axis of the panel. CONSTITUTION:When the phosphor surface of a color picture tube is formed, a slit plate 6 covering a superhigh-pressure mercury lamp 5 is arranged in parallel to the axis line A-A' with which the longitudinal direction of a slit 7 is inclined by the angle theta of revolution clockwise in relation to the horizontal axis X-X' of a face panel 4, and the lamp 5 is arranged so that a slender discharge luminous part 10 is parallel to the vertical axis Y-Y' of the panel 4. Therefore, the light projection point of the lamp 5, viewed from the lower surface side of a correcting lens system, especially from the peripheral part, shifts clockwise, and the collision point of the exposure light source which hits, passing through a shadow mask, onto a light-sensitive film fitted on the inner surface of a panel 4, especially onto the peripheral part, e.g. the exposure point shifts counterclockwise, and thus discrepancy of position in case when the collision point of an electron beam shifts clockwise can be eliminated. |
