Bulb for detection

Abstract

The invention relates to a bulb for detection. The bulb comprises a lamp head and a glass housing. The glass housing is internally provided with a core column and filaments. The upper end surface of the glass housing is in arc inverse-taper shape; the center of the arc surface is provided with an arched protrusion; the arched protrusion occupies 1/2-2/3 of the whole arc surface; the inner wall of the glass housing is painted black; only the glass housing, right ahead of the plane where the filaments locate, is provided with a rectangular or square light-transmitting window; a fixation base is connected between two guide wires. The fixation base is provided with a plurality of molybdenum wire hooks which are arranged alternatively at the upper and the lower; the filaments sequentially pass through the hook portions on the tops of the molybdenum wire hooks from left to right; and the filaments are in M shape distribution and are arranged on the same plane. The bulb for detection enables the filament adjustment to be simple; the glass housing is provided with the arched protrusion; the blackening phenomenon of the glass housing focuses on the top; therefore, the deposition area is concentrated, the area is reduced, and the service life of the bulb is improved.

Description

technical field [0001] The invention relates to a lamp, in particular to a standard bulb for luminous intensity detection. Background technique [0002] The standard lamp for luminous intensity detection is used to reflect and transmit the value of the luminous intensity unit (candela cd), and is an important standard instrument in the measurement of light radiation. Standard lamps for luminous intensity testing are generally made of incandescent lamps or tungsten halogen lamps. In order to make the filament the only illuminant of the standard lamp for luminous intensity testing, stray light from glass bulbs and other filament supports should be minimized. At present, typical standard lamps for luminous intensity detection are generally only composed of bulbs and lamp holders, and stray light has a greater impact, and it is difficult to obtain stable and uniform light intensity values. Some standard lamps for luminous intensity detection use An overly complex structure incr...

AI Technical Summary

Problems solved by technology

At present, typical standard lamps for luminous intensity detection are generally only composed of bulbs and lamp holders, and stray light has a greater impact, and it is difficult to obtain stable and uniform light intensity values. Some standard lamps for luminous intensity detection use An overly complex structure increases production costs, and long-term use of filament oxidation will cause the surface of the bulb to blacken and affect the quality of light

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