Light guide and manufacturing method

Abstract

The invention relates to optical transmission technology and provides a light guide which comprises a transparent pipe and at least one layer reflective tape pasted on the external walls of the transparent pipe, wherein the reflective tape comprises a substrate and a reflective glue layer pasted on the substrate, the reflective glue layer is mixed with reflective materials and a mucilage glue used for pasting. The invention also provides a manufacturing method for a light guide. In the light guide, a glue-type structure by using a reflective tape not only increases the adhesive strength, but also improves the sealing performance, thus the light energy consumption can be greatly reduced and a higher reflection rate can be obtained; furthermore, the glue-type reflective tape well separates the transparent pipe with the outside and has the small possibility of wearing or other damages caused by an outer protective device, thus effectively prolonging the service life of the light guide and having a wide application prospect.

Description

technical field [0001] The invention belongs to the field of light transmission devices, and in particular relates to a light guide pipe and a manufacturing method thereof. Background technique [0002] The light pipe usually used for natural lighting is to transmit the light collected from the light collecting cover to the diffuser with low loss through the light pipe through the principle of the reflector, so as to realize the transmission of natural light to the field to be illuminated. To achieve the purpose of using natural light lighting. [0003] In the existing technology, one is to use a solid rectangular light pipe, which is coated with a reflective film on the outside. Because it is an optical glass product, its 90° right-angle ridges are easily damaged, forming continuous dark spots, resulting in A large loss of light energy, and dust will enter at the same time, resulting in the expansion of dark spots, resulting in a further decline in the light guide rate of ...

AI Technical Summary

Problems solved by technology

In addition, the manufacturing length of the aluminum substrate is different from the on-site assembly length, which leads to the cutting of the aluminum substrate during on-site assembly, which inevitably causes permanent scratches on the edge of the aluminum substrate, and can also lead to the formation of large dark spots

[0005] 2) Cost issue

[0006] 3) The matching of the thermal expansion rate of the aluminum substrate and the light collecting device

Since the material of the light collecting cover is glass or quartz, the thermal expansion rate of the aluminum substrate and the light collecting cover is different. As the temperature difference changes, a large amount of dust will enter, resulting in a sharp drop in the light guide rate of the light guide, which will soon reach a critical threshold. As a result, the life limit is reached, and the light guide fails

[0007] 4) Before the metal substrate is sprayed, it needs to be leveled, and the surface roughness should be within 1mm. The process requirements are high. When the light guide is installed, it is easy to be deformed by external force impact, resulting in a decrease in reflectivity

The advantage of evaporation is that Al film is dense, flat, and high reflectivity (95-98%). The disadvantage is that it is easy to oxidize, the length of the metal substrate is limited, the output is low, and the evaporation equipment is expensive and difficult to maintain.

The advantage of spraying is that there is no length limit for the metal substrate, the spraying equipment is simple and easy to maintain, the reflectivity is high (92-95%), and the output is large. The disadvantage is that the reflective coating is not dense, the film thickness is uneven, easy to fall off, and dark spot

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