Patent ID: 6744185
Filing Date: 2004-06-01
Classification: H01J

Abstract:
A beam-index-type cathode ray tube, comprising:a vacuum tube defined by a panel and a funnel having a neck; a phosphor screen provided with index stripes to provide color selection, the phosphor screen being formed on an inner surface of said panel; an electron gun mounted inside said neck to emit electron beams toward said phosphor screen; a deflection yoke mounted around said neck; a transparent light reception window provided on said funnel; a detector to generate an index electric signal by condensing index light generated from said index stripes through said light reception window; and an index circuit to transmit a signal obtained by synchronizing said index signal with a color signal, wherein when a diagonal length on an outer surface of said funnel is â€œdâ€ , said light reception window is provided at a location within a range of 0.1-0.3 d from a corner of a seal edge of said funnel.