A blackboard lighting fixture

Abstract

The invention relates to a blackboard illumination lamp. The blackboard illumination lamp comprises a lamp housing, a lamp holder, a lamp tube, a reflector and a power source, wherein the lower portion of the lamp housing is open, the lamp holder is arranged in the lamp housing, the two ends of the lamp tube are connected to the lamp holder, the reflector is arranged above the lamp tube, and the power source supplies power to the lamp tube. The cross section, with a reflection effect on the lamp tube, in the reflector is formed by connecting a parabolic segment, a horizontal linear segment and an inclined linear segment in sequence. When the blackboard illumination lamp is installed above a blackboard, the luminance of the blackboard can reach 534 lx or above, the uniformity of luminance can reach 0.92 or above, the UGR value nearby a teacher is almost ignored, and the teacher cannot feel glare basically.

Description

【Technical field】 [0001] The invention relates to a lighting fixture, in particular to a lighting fixture for blackboard lighting. 【Background technique】 [0002] The purpose of classroom blackboard lighting is to provide a good visual environment to ensure that teachers and students can easily write and read on the blackboard. Ideal blackboard lighting should ensure that the average illuminance and illuminance uniformity are well maintained on the vertical surface of the blackboard. When the blackboard lighting fixtures are installed in a suitable position, they will not cause uncomfortable glare to teachers and students. [0003] The National Standard of the People's Republic of China "Sanitary Standards for Daylighting and Lighting of Classrooms in Primary and Secondary Schools" (GB7793-2010), revised and issued by the Ministry of Health and the National Standards Committee, came into effect in May 2011. It should be lower than 500lx, and the uniformity of illumination s...

AI Technical Summary

Problems solved by technology

However, although the Hygienic Standards for Daylighting and Illumination in Classrooms of Primary and Secondary Schools (GB7793-2010) have been promulgated for many years, the existing classroom blackboard lights still generally have the problem of maintaining an average illuminance of less than 400lx and an illuminance uniformity of less than 0.7

In addition, due to the unreasonable light distribution design of the blackboard lighting fixtures, the teachers and the students in the front row will have extremely uncomfortable glare

[0004] Because the installation position of the blackboard lighting fixture is relatively fixed, it is generally installed above the blackboard, and the position is higher than the upper end of the blackboard, and the distance from the upper and lower ends of the blackboard is quite different. The illuminance at the top of the blackboard is lower than that of the blackboard, resulting in a serious low uniformity of illuminance on the vertical surface of the blackboard

The applicant's application number is 201520591846.7 utility model patent filed on August 7, 2015, which discloses a lighting fixture. Although its uniformity can reach 0.9, the horizontal distance between the lamp and the blackboard needs to be more than 1.1 meters. Standing between the blackboard lamp and the blackboard during lectures, the glare is large and the feeling is more dazzling

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