Luminous intensity detection standard bulb

Abstract

The invention relates to a luminous intensity detection standard bulb. The luminous intensity detection standard bulb comprises a lamp holder and a glass casing. The glass casing is internally provided with a core column and a filament. The glass casing is inverted-conical shaped and is provided with an upper surface in the shape of an arc surface; the center of the arc surface is provided with an arc projection; the arc projection accounts for 1 / 2 to 2 / 3 of the whole arc surface; the inner wall of the glass casing is blackened; the glass casing right in front of the plane where the filament is located is provided with only a rectangular or square light transmission window; a fixation base is connected between two leads; the fixation base is provided with a plurality of molybdenum wire hook groups; each molybdenum wire hook group comprises two molybdenum wire hooks, i.e., a higher molybdenum wire hook and a lower molybdenum wire hook; the hook portions of the two molybdenum wire hooks are at the same vertical line; the filament successively passes through the hook portion at the top of each molybdenum wire hook from the left to the right according to a square wave shape; and the filament is disposed at the same plane. The luminous intensity detection standard bulb provided by the invention enables the adjustment of the filament to be simpler, and the glass casing is provided with the arc projection to concentrate the blackening phenomenon of the glass casing at the top portion so that the deposition area is concentrated, the area is reduced, and the service life of a 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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