Fluorescent Lamp

Abstract

The invention provides a fluorescent lamp, which is provided with a light-emitting tube made from quartz glass and emits ultraviolet rays, even if temperature difference between the internal and the external of the lamp is great, a fluorophor layer is not stripped. An ultraviolet reflective layer with silica particles as the main component is formed on a region of the internal surface of the light-emitting tube apart from a light taking-out zone, a glass layer formed by a substance with the softening point lower than that of the quartz glass is formed at the internal side of the ultraviolet reflective layer and the circumference of the light-emitting tube, a fluorophor layer is formed at the internal side of the glass layer, and the thickness of the ultraviolet reflective layer is 30-500 micrometers.

Description

technical field [0001] The present invention relates to a fluorescent lamp, in particular to a fluorescent lamp emitting ultraviolet rays. Background technique [0002] In the manufacturing process of liquid crystal panels used in large-scale televisions, etc., a light source that emits ultraviolet rays with a wavelength of 300 nm to 400 nm as the center is required, and ultraviolet-emitting fluorescent lamps are attracting attention as one of them. [0003] However, so-called hard glasses such as soda glass, borosilicate glass, and aluminosilicate glass are generally used in arc tubes of conventional ultraviolet-emitting fluorescent lamps. Not preferred in lamps. [0004] Therefore, for example, Patent Documents 1, 2, and the like propose fluorescent lamps using quartz glass as an arc tube. This is because quartz glass has good ultraviolet light transmission properties and can efficiently extract light. [0005] However, in the manufacturing process of fluorescent lamps,...

AI Technical Summary

Problems solved by technology

Since the softening point temperature of quartz glass is a high temperature around 1600°C, when the quartz glass is heated at such a high temperature to attach phosphor, there is a problem that the phosphor itself is degraded by the high temperature.

[0006] On the other hand, although it is considered that the luminous tube is heated to a temperature at which the phosphor does not deteriorate, for example, 900° C. or less, in this case, the quartz glass is not sufficiently softened, and the adhesion of the phosphor to the quartz glass becomes weak, so there is Problems with Phosphor Peeling When Lamp Is Lighted

[0007] In addition, even if the quartz glass and the phosphor can be adhered well, when the lamp is turned on and off, if the temperature difference between the outer surface of the lamp and the discharge space is large, the phosphor will also peel off, resulting in a decrease in the amount of emitted light. bad situation

In particular, in fluorescent lamps used in the manufacturing process of liquid crystal panels, strong cooling is performed to suppress temperature rise of the liquid crystal panels, so the temperature difference between the inside and outside of the lamp is large, and the above-mentioned defect of phosphor peeling is serious.

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