RED BULB

摘要

PROBLEM TO BE SOLVED: To provide a red bulb preventing deviation of the chromaticity of red light obtained by a light fitting from a predetermined range and preventing color unevenness. SOLUTION: The red bulb includes: a glass bulb 1 provided with a surrounding portion 1a having a space 1c formed inside and with a pinch seal portion 1b having a neck region N adjacent to one end of the surrounding portion 1a; a filament 2 sealed inside the surrounding portion 1a of the glass bulb 1; a terminal 3 led out to outside via the pinch seal portion of the glass bulb and attached to a flat face of the pinch seal portion 1b; and a red filter film 4 continued from the glass bulb and formed over the outer face of the neck region of the pinch seal portion. COPYRIGHT: (C)2010,JPO&INPIT