Patent ID: 6400085
Filing Date: 2002-06-04
Classification: H01J,H04N

Abstract:
A beam index type cathode ray tube comprising:a panel; a phosphor screen formed on an inner surface of the panel and having index stripes; an electron gun emitting electron beams toward the phosphor screen in response to a color switching signal; a funnel having a light receiving window; an index light incident part, formed on an outer peripheral surface of the light receiving window of the funnel, receiving an index light signal emitted from one of the index stripes via the light receiving window; an optical cable connected to the index light signal incident part, transmitting the index light signal; an optical detector converting the index light signal provided from the optical cable to an index current signal; and an index circuit part synchronizing the index current signal with the color switching signal and transmitting the color switching signal to the electron gun.