Gun sight narrow-band negative filter film and preparation method thereof and optical filter

Abstract

The invention relates to a gun sight narrow-band negative filter film and a preparation method thereof and an optical filter. The film is formed by sequentially stacking 35 film layers including a first Al2O3 film layer, a first SiO2 film layer, a second Al2O3 film layer, a second SiO2 film layer, a third Al2O3 film layer, a third SiO2 film layer, a fourth Al2O3 film layer, a fourth SiO2 film layer, a fifth Al2O3 film layer and the like. The anti-color-cast sighting telescope filter film prepared by the invention is arranged between the gluing surfaces of the two glass substrates, so that thecolor of a sighting object can be distinguished, and the actual color of the sighting object can be restored through the objective lens. According to the design, the film layer is clamped between thetwo glass substrate materials, so that the middle narrow-band negative filter film can be effectively protected and is not easy to absorb moisture and scratch. The gun sight narrow-band negative filter film can solve the problem that a relatively small high reflection band is generated by using a 650nm triple frequency design but a high reflection band appears in a quadruplicated frequency 400-450nm waveband, and meanwhile, the usage amount of a film material is only 1 / 3 of the usage amount of the triple frequency. The design of medium-high refractive index film material matching or medium-lowrefractive index matching is adopted, and the problem that the medium-high refractive index matching bandwidth is ultra-wide is solved.

Description

technical field [0001] The invention relates to a gun sight narrow-band negative filter film, a preparation method and a filter, which are mainly applied to the objective lens of a reflective red dot sight. Background technique [0002] Reflex sights are often also called red dot sights, because the aiming mark of this kind of sight is usually a red or bright orange light spot, and its optical system is different from that of telescopic sights, usually without a magnification system. There is no inversion system either. The principle is that the concave mirror is coated with multi-layer reflective film, and the light emitted by the lighting system passes through the reticle and then forms dots on the concave mirror and reflects to enter the human eye with parallel light, at the same time, the human eye sees the target through the concave mirror , aiming is done when the aim marker overlaps the target. For a high-precision reflex sight, the curvature of the concave mirror i...

AI Technical Summary

Problems solved by technology

[0003] For the early concave mirrors, only red high-reflection film is used, and its reflection bandwidth exceeds more than 100 nanometers. In addition to the light reflection of 650nm, other colors also reflect, so the imaging is lack of color, and the original appearance of the aiming object cannot be truly displayed.

With the development of technology, the simple concave mirror launch sight can no longer meet the needs of shooters

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