Gradient lens with black layer and its preparing process

Abstract

A process for preparing lens with black layer and gradient refrectivity includes such steps as making silicate glass containing T1 and B, making glass rod, immersing in fused potassium nitrate, and putting it in the mixture of fused potassium nitrate and sodium nitrate. Its advantages are high blackness, firmness, optical absorption and insulating performance. Its can be used as linear array scanner or endoscope for higher contrast and transmission function.

Description

1. Technical field [0001] The invention relates to the field of optical parts, in particular to a gradient refractive index lens with a black cladding and a preparation process thereof. 2. Background technology [0002] At present, lens arrays on fax machines, copiers, scanners and other equipment generally use exchanged lenses. In order to prevent light interference between lenses, a black adhesive layer is applied to the periphery of the lenses and then arranged. It is coated with a black adhesive layer, which cannot completely prevent the interference of light, so the degree of optical insulation is not good, and the optical transmission of the lens array and the contrast of the image are reduced; in addition, when making a gradient refractive index endoscope, In order to prevent the reflection of light on the cylindrical interface of the gradient index rod lens and cause stray light to enter the imaging system, a layer of black glue is usually coated on the periphery of ...

AI Technical Summary

Problems solved by technology

[0002] At present, lens arrays on fax machines, copiers, scanners and other equipment generally use exchanged lenses. In order to prevent light interference between lenses, a black adhesive layer is applied to the periphery of the lenses and then arranged. It is coated with a black adhesive layer, which cannot completely prevent the interference of light, so the degree of optical insulation is not good, and the optical transmission of the lens array and the contrast of the image are reduced; in addition, when making a gradient refractive index endoscope, In order to prevent the reflection of light on the cylindrical interface of the gradient index rod lens and cause stray light to enter the imaging system, a layer of black glue is usually coated on the periphery of the cylindrical surface of the rod lens, but when making a narrow-diameter endoscope When the diameter of the mirror body is very small, generally below φ1mm, the thickness of the glue layer often occupies the space of the mirror body, so the number of light beams from the optical fiber decreases, and the brightness of the illumination light decreases. At the same time, due to the glue layer Poor optical insulation will cause the contrast and resolution of the image to decrease