Gas discharge lamps and their external visors

Abstract

An external light-shielding plate for a gas discharge lamp, which includes: an upper reflection part, which is an arc part formed by cutting more than half of a first frustum-shaped cylinder, wherein the corresponding cut part forms a second A notch; the lower reflection part is a special-shaped conical truncated portion formed by cutting less than 1 / 2 of the second truncated conical cylinder, wherein the corresponding cut-off part forms a second gap; the large opening of the second truncated conical cylinder The end is directly connected with the large mouth end of the first frustum-shaped cylinder; the edge of the second notch is directly connected with the edge of the first notch; wherein, the clamp between the generatrix of the first frustum-shaped cylinder and the central axis of the first frustum-shaped cylinder The angle is greater than the included angle between the generatrix of the second frustum-shaped cylinder and the central axis of the second frustum-shaped cylinder. The above-mentioned gas discharge lamp adopts an external shading plate and cancels the built-in shading plate, which can effectively reduce the light emitted by the light source from irradiating the light source, thereby reducing the temperature of the light source and improving the use of the light source. The invention also provides a gas discharge lamp.

Description

【Technical field】 [0001] The invention relates to a gas discharge lamp, in particular to a gas discharge lamp with an external light-shielding plate. 【Background technique】 [0002] Projection-type gas discharge lamps are generally installed by side wall installation, and the reflector is circular. At present, these lamps use built-in shading plates, that is, the shading plates are installed in the reflector to control the upward irradiation of light and make it downward to improve the utilization rate of light. The purpose is to let the light shine on the place where it should be irradiated. [0003] However, because the size of the built-in shading plate is limited by the size of the reflector, there is no limit to the light in the X-axis direction, and the installation position is too close to the light source, resulting in a lot of light reflection and the light source illuminant, so the temperature of the light source will increase significantly, and the life of the lig...

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Problems solved by technology

[0003] However, because the size of the built-in shading plate is limited by the size of the reflector, there is no limit to the light in the X-axis direction, and the installation position is too close to the light source, resulting in a lot of light reflection to the light source illuminant, so the temperature of the light source will increase significantly, and the life of the light source Depends on the temperature, the higher the temperature is, the shorter the life of the plateau is, and the self-heating of the light source of the 1000W and above gas discharge lamp is already very high, so the built-in shading plate will reduce the service life of the gas discharge lamp, making the gas discharge lamp In addition to the very high purchase cost of the light source itself, the maintenance cost is also high because the high-power lamps are installed in a high position

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