CN212207728U - A lens-enhancing sheet that is easy to repair - Google Patents

Abstract

The utility model relates to a lens enhancement sheet which is convenient for repairing, comprising a lens base, a silver layer with a thickness of 2-4 nm plated on the outer side of the lens base, and an anti-reflection film plated on the outer side of the silver layer . The lens enhancement sheet uses ultra-thin AG as the transition layer between the substrate and the AR film layer of the anti-reflection film. The ultra-thin layer of AG has the characteristics of low refractive index and low absorption in the visible light band, which will not weaken the anti-reflection effect of the anti-reflection film, and can After the coating quality problem occurs, the chemical immersion method is used to remove the AG layer, which can completely peel off the AR film, and then redeposit the anti-reflection film, which can improve the repair rate of the lens-enhancing sheet and reduce the production cost, which is suitable for industrial applications. Outstanding Contribution.

Description

A lens-enhancing sheet that is easy to repair

technical field

The utility model relates to the field of optics, in particular to a lens-enhancing sheet which is convenient for repairing.

Background technique

When light is vertically incident on an ordinary glass surface, the ratio of the intensity of the reflected light on the incident surface to the intensity of the incident light (reflectivity) is only determined by the ratio of the refractive index of the adjacent medium: each surface of crown glass with a refractive index of 1.52 The reflection is about 4.2%. Flint glass with a higher refractive index has a more pronounced surface reflection. This surface reflection has two serious consequences: the loss of light energy reduces the brightness of the image; the surface reflected light is reflected or diffused for many times, and part of it becomes stray light, and finally reaches the image plane to reduce the contrast of the image. Image quality, especially complex systems such as television and film camera lenses, contain many surfaces adjacent to the air. If they are not coated with anti-reflection coatings, their performance will be greatly reduced. Therefore, these instruments are coated on the surface. An anti-reflection coating.

There are many optical instruments used in the visible spectral region, accounting for the vast majority of anti-reflection coatings in terms of output, and anti-reflection processing is required on almost all optical devices. In particular, the surface of the lens of visible vision optical lenses is generally coated with a visible width antireflection coating to improve the light throughput of the lens and reduce image quality problems such as ghost images.

The coating process usually adopts PVD (Physical Vapor Deposition) technology. Although the coating equipment and process technology are mature now, the control accuracy of the film thickness is nano-level, and the anti-reflection coating is not only required by the spectral reflectance index, but also has smoothness and firmness. and other performance requirements. Therefore, if the coating index is unqualified or other performance indexes are unqualified, the lens can only be scrapped, because it is very difficult to completely remove the film deposited on the surface of the lens, and the film cannot be removed by chemical methods. The uneven residual film will affect the color of the film, and there will be abnormalities such as color spots; the physical re-throwing law will cause problems such as unqualified lens sag height due to the excessive removal of the lens substrate. Rework costs are high and yields are low.

Utility model content

The utility model provides a lens-enhancing sheet that is convenient for repairing. The lens-enhancing sheet of the utility model is convenient for repairing. If the coating index is unqualified or other performance indexes are unqualified, the film layer plated on the lens can be removed. It can be removed cleanly, and the anti-reflection effect will not be weakened after successful plating, so that it has excellent anti-reflection effect in the visible light range.

The utility model is realized through the following technical solutions:

A lens enhancement sheet which is convenient for repairing comprises a lens base, a silver layer with a thickness of 2-4 nm plated on the outer side of the lens base, and an anti-reflection film plated on the outer side of the silver layer.

Preferably, the lens substrate is glass with a refractive index range of 1.46-2.1 or a crystal with a refractive index of 1.38-2.4.

Preferably, the anti-reflection film layer includes a first H4 film layer with a thickness of 25.1-28.7 nm, a first MgF ₂ film layer with a thickness of 35.4-33.2 nm, and a thickness of 130.4 nm, which are sequentially stacked from the inside to the outside. -139.0nm second H4 film and 87.1-92.2nm thick _second MgF2 film.

A method for preparing a lens enhancement sheet that is easy to repair, comprising the following steps: first cleaning a lens substrate, then plating a 2-4 nm silver layer on the outer surface of the lens substrate, and finally plating the antireflection film layer on the outer side of the silver layer.

Compared with the prior art, the present invention has the following beneficial effects: the lens-enhancing sheet of the present invention adopts ultra-thin AG as the transition layer between the substrate and the AR film layer of the anti-reflection film, and the ultra-thin layer AG has low refraction in the visible light band. It not only does not weaken the anti-reflection effect of the anti-reflection coating, but also can remove the AG layer by chemical immersion after the coating quality problem occurs, which can completely peel off the AR coating, and then redeposit the anti-reflection coating. Therefore, the repair rate of the lens-enhancing sheet can be increased, thereby reducing the production cost and making outstanding contributions to industrial applications.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

FIG. 2 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 1 of the present invention.

FIG. 3 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 2 of the present invention.

FIG. 4 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 3 of the present invention.

FIG. 5 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 4 of the present invention.

FIG. 6 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 5 of the present utility model.

FIG. 7 is a reflectance spectrum diagram in the wavelength range of 380-780 nm in Example 6 of the present invention.

Detailed ways

Below in conjunction with specific embodiment, the utility model is further elaborated:

Example 1

As shown in FIG. 1 , a lens-enhancing sheet for easy repair includes a lens base 1 , a silver layer 2 with a thickness of 2-4 nm plated on the outer side of the lens base 1 , and a silver layer 2 plated on the outside of the silver layer 2 Anti-reflection coating layer 3 on the side.

The lens substrate 1 described in this embodiment is K9 glass with N=1.52.

The anti-reflection film layer 3 includes a first H4 film layer 3-1 with a thickness of 27.9 nm, a first MgF ₂ film layer 3-2 with a thickness of 32.2 nm, and a thickness of 135.0 nm, which are sequentially stacked from the inside to the outside. A second H4 film layer 3-3 with a thickness of 89.5 nm and a _second MgF2 film layer 3-4 with a thickness of 89.5 nm.

Example 2

Different from the above Embodiment 1, the anti-reflection film layer 3 in this embodiment includes a first H4 film layer 3-1 with a thickness of 27.1 nm and a first H4 film layer 3-1 with a thickness of 31.2 nm, which are sequentially stacked from the inside to the outside. A MgF ₂ film layer 3-2, a second H4 film layer 3-3 with a thickness of 131.0.0 nm, and a second MgF ₂ film layer 3-4 with a thickness of 86.8 nm.

Example 3

Different from the above-mentioned Embodiment 1, the anti-reflection film layer 3 in this embodiment includes a first H4 film layer 3-1 with a thickness of 28.7 nm and a first H4 film layer 3-1 with a thickness of 33.2 nm, which are sequentially stacked from the inside to the outside. A MgF ₂ film layer 3-2, a second H4 film layer 3-3 with a thickness of 139.0 nm, and a second MgF ₂ film layer 3-4 with a thickness of 92.2 nm.

Example 4

The lens substrate 1 described in this embodiment is a quartz crystal N=1.55

The anti-reflection film layer 3 includes a first H4 film layer 3-1 with a thickness of 25.9 nm, a first MgF ₂ film layer 3-2 with a thickness of 36.5 nm, and a thickness of 134.4 nm, which are sequentially stacked from the inside to the outside. A second H4 film layer 3-3 with a thickness of 89.8 nm and a _second MgF2 film layer 3-4 with a thickness of 89.8 nm.

Example 5

Different from Example 4, the anti-reflection coating layer 3 in this embodiment includes a first H4 coating layer 3-1 with a thickness of 25.1 nm and a first MgF layer with a thickness of 35.4 nm, which are sequentially stacked from the inside to the outside. ₂ film layer 3-2, a second H4 film layer 3-3 with a thickness of 130.4 nm, and a second MgF ₂ film layer 3-4 with a thickness of 87.1 nm.

Example 6

Different from Example 4, the anti-reflection coating layer 3 in this embodiment includes a first H4 coating layer 3-1 with a thickness of 26.7 nm and a first MgF layer with a thickness of 37.6 nm, which are sequentially stacked from the inside to the outside. ₂ film layers 3-2, a second H4 film layer 3-3 with a thickness of 138.4 nm, and a second MgF ₂ film layer 3-4 with a thickness of 92.5 nm.

As shown in Figure 2-7, the thin line in Figure 2 represents the spectrum of the anti-reflection coating without silver coating in the wavelength range of 380-780nm, and the thick line is the anti-reflection coating with silver coating. In the spectrum in the wavelength range of 380-780nm, it can be seen that the anti-reflection effect of the anti-reflection coating is not weakened in the wavelength range of 380-780nm after the silver coating. Removing the AG layer can completely peel off the AR film, and then redeposit the anti-reflection film. Therefore, the repair rate of the lens-enhancing sheet can be improved, thereby reducing the production cost and making outstanding contributions to industrial applications.

The present invention is not only limited to the above-mentioned embodiments, and any improvement or replacement based on the principles of the present invention shall fall within the protection scope of the present invention.

Claims (3)

1. An anti-reflection lens convenient to reprocess which characterized in that: the anti-reflection coating comprises a lens substrate (1), a silver layer (2) plated on the outer side surface of the lens substrate (1) and having the thickness of 2-4 nm, and an anti-reflection coating layer (3) plated on the outer side surface of the silver layer (2).

2. An anti-reflective lens to facilitate rework as recited in claim 1, wherein: the lens substrate (1) is glass with the refractive index range of 1.46-2.1 or crystal with the refractive index range of 1.38-2.4.

3. An anti-reflective lens to facilitate rework as recited in claim 1, wherein: the antireflection film layer (3) comprises a first H4 film layer (3-1) with the thickness of 25.1-28.7nm and a first MgF with the thickness of 35.4-33.2nm which are sequentially stacked from inside to outside₂Film layer (3-2), second H4 film layer (3-3) with thickness of 130.4-139.0nm and second MgF with thickness of 87.1-92.2nm₂And (3) a film layer (4).

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