CN211741620U

CN211741620U - Lens and lens assembly

Info

Publication number: CN211741620U
Application number: CN202021989707.7U
Authority: CN
Inventors: 陈怀玉; 王佳
Original assignee: Changzhou Ruitai Photoelectric Co Ltd
Current assignee: Changzhou Ruitai Photoelectric Co Ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-10-23
Anticipated expiration: 2030-09-14
Also published as: WO2022052268A1

Abstract

The utility model provides a lens, including the basement with locate the complex film on basement surface, the complex film includes first rete, second rete and the low folded layer that stacks gradually the setting, the refracting index of first rete is n1, the refracting index of second rete is n2, the refracting index of low folded layer is n 3; wherein n1< n2, n3< n1 and n3<1.4, so that the film layer near the outer side of the composite film has lower refractive index, and the lens has lower reflectivity.

Description

Lens and lens assembly

Technical Field

The utility model relates to an optical film technical field especially relates to a lens and camera lens subassembly.

Background

In the optical imaging process, when light enters the surface of a transparent medium such as glass, multi-beam interference is generated, namely, the light is reflected and refracted for multiple times on the incident surface and the emergent surface of the medium, so that the light transmittance is reduced; in an optical lens assembly, an AR film, which may be referred to as an antireflection film or an antireflection film, is generally disposed on a surface of a lens to improve light transmittance of the lens and improve a Ghost/Flare phenomenon caused by multiple reflections of light rays in the lens, but the conventional AR film has a limited improvement effect.

Therefore, a new lens structure is needed to change the current situation.

Disclosure of Invention

An object of the utility model is to provide a lens and camera lens subassembly for improve the luminousness of light.

The utility model provides a lens, including the basement with locate the complex film on basement surface, the complex film includes first rete, second rete and the low folded layer that stacks gradually the setting, the refracting index of first rete is n1, the refracting index of second rete is n2, the refracting index of low folded layer is n 3; wherein n1< n2, n3< n1 and n3< 1.4.

Optionally, the low fold layer is disposed on the outermost side away from the substrate.

Optionally, the composite film comprises a layer a of the first film layer and a layer b of the second film layer, and the layer a of the first film layer and the layer b of the second film layer are alternately arranged in a direction away from the low-folding layer; a >1 and b > 1.

Optionally, the total number of layers of the composite film is c layers, c = a + b +1, and c ranges from 6 to 10.

Optionally, the total number c of the composite film is 8, and the composite film includes four second film layers and three first film layers, the four second film layers are arranged at intervals, and the three first film layers are respectively filled between two adjacent second film layers; the reflectivity of the composite film is less than 0.22% at the wavelength of 425-725 nm.

Optionally, the total number of layers of the composite film is an even number.

Optionally, the low-folding layer is a magnesium difluoride layer.

Optionally, the first film layer is a silicon dioxide layer, and the second film layer is a titanium dioxide layer or a titanium trioxide layer.

Optionally, the substrate is made of plastic.

The utility model also provides a lens subassembly, including above-mentioned arbitrary one the lens.

The beneficial effects of the utility model reside in that:

the utility model discloses an among the lens, including the basement with locate the complex film on basement surface, the complex film is including the first rete, second rete and the low folded layer that stack gradually the setting, and the refracting index of low folded layer, first rete and second rete improves in proper order to the second rete is located between first rete and the low folded layer, so that the complex film has lower reflectivity, thereby improves the light transmissivity of lens, and then improves in the lens because the Ghost/Flare phenomenon that light formed through multiple reflection, excellent in use effect.

The utility model discloses an among the lens subassembly, through setting up above-mentioned lens to make the lens subassembly have better formation of image effect, Ghost/Flare can improve, and optical imaging effect can improve.

Drawings

FIG. 1 is a schematic diagram of a film structure of a prior art lens;

fig. 2 is a schematic view of a partial structure of a lens according to an embodiment of the present invention;

fig. 3 is a schematic view of a partial structure of a lens according to another embodiment of the present invention;

figure 4 is a comparison of the spectral curves of the lens of figure 3 with a prior art lens.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

The embodiment of the utility model provides a lens subassembly, this lens subassembly are used for optical imaging, and the lens subassembly includes but not limited to camera equipment, optical detection equipment etc. and the lens subassembly is including lens 10, and lens 10 is used for optical imaging, and refer to fig. 2 and show, and lens 10 includes basement 200 and locates complex film 100 on basement 200, and complex film 100 can provide the effect that reduces the reflection, increases the luminousness.

Referring to fig. 1, in the structure of the conventional lens 10, the structure includes a film structure 1 and a substrate 200, the film structure 1 is generally formed by alternately stacking low refractive index film layers 11 and high refractive index film layers 12, and is disposed on a surface of the substrate 200 along a light path, specifically, the substrate 200 may have the film structure 1 disposed on two opposite sides; as shown in fig. 2, compared to the conventional film structure 1, the composite film 100 of the present embodiment includes a first film 110, a second film 120 and a low-refractive-index layer 130 stacked in sequence, where the refractive index of the first film 110 is n1, the refractive index of the second film 120 is n2, and the refractive index of the low-refractive-index layer 130 is n 3; wherein n1< n2, n3< n1 and n3< 1.4.

The utility model discloses in lens 10 of embodiment, including base 200 with locate the complex film 100 on base 200 surface, low folded layer 130 in the complex film 100, the refracting index of first rete 110 and second rete 120 improves in proper order, and second rete 120 locates between first rete 110 and the low folded layer 130, from this first rete 110 and second rete 120 form and interfere the rete and offset interference light, and this complex film 100 has lower refracting index near the rete in the outside, thereby make complex film 100 have lower reflectivity, the light transmittance of lens 10 can improve, and then improve in the lens 10 because the light is through the Ghost/Flare phenomenon that multiple reflection formed, the result of use can improve.

Specifically, the thickness ranges of the film thicknesses of the first film 110, the second film 120, and the low-folding layer 130 are 5nm to 100nm, and the thicknesses can be selected according to actual requirements, it should be noted that the first film 110, the second film 120, and the low-folding layer 130 may be set to the same film thickness or different film thicknesses, which is not limited herein.

According to the thin film deposition theory, the average value of reflectance is mainly affected by the following conditions:

1. outermost refractive index: the lower the refractive index of the outermost layer, the lower the average value of the reflectivity, that is to say, the positive correlation between the refractive index of the outermost layer and the average value of the reflectivity;

2. bandwidth dereflection: when the antireflection bandwidth is increased, the reflectivity average value is increased, namely the antireflection bandwidth and the reflectivity average value are in a positive correlation relationship;

3. the total number of layers of the film system and the total thickness of the film layer are as follows: the higher the total layer number and the total thickness of the film layer are, the lower the average value of the reflectivity is, namely, the negative correlation relationship is formed among the total layer number, the total thickness of the film layer and the average value of the reflectivity;

4. a refractive index difference; the larger the difference in refractive index between the high refractive index film layer and the low refractive index film layer, excluding the outermost layer, the lower the average value of the reflectance, that is, the negative correlation between the difference in refractive index and the average value of the reflectance.

Compared with the conventional film structure 1, the average reflectivity of the composite film 100 in this embodiment is reduced by reducing the value of the outermost refractive index, so that the composite film 100 has a higher transmittance than the conventional film structure 1.

Specifically, in one embodiment, the low fold 130 is disposed outermost from the substrate 200. Referring to the display state shown in fig. 2, the low-folded layer 130 is located on the lower side of the substrate 200, and the substrate 200 is located on the upper side of the composite film 100; in the lens 10, the low-refractive layer 130 is disposed on the side of the substrate 200 away from the image side, and in other embodiments, the low-refractive layer 130 may also be disposed on the side of the substrate 200 close to the image side.

Further, the composite film 100 includes a first film layer 110 of a layer and a second film layer 120 of b layer, the first film layer 110 of a layer and the second film layer 120 of b layer are alternately arranged along a direction away from the low-folded layer 130; a >1 and b > 1.

A plurality of interference film layers may be formed by alternately combining a plurality of first film layers 110 and a plurality of second film layers 120, and one end of the plurality of interference film layers in the optical path direction is the second film layer 120, and the second film layer 120 is connected to the low-refractive-index layer 130, so that the outermost layer of the composite film 100 is the low-refractive-index layer 130; in the composite film 100 of the embodiment, by providing a combination of the first film layer 110 and the second film layer 120, and the low-refractive layer 130, the total thickness of the composite film 100 is increased, the average reflectivity of the composite film 100 is decreased, and the optical performance of the lens 10 is improved by increasing the total thickness of the composite film 100 to increase the light transmittance of the composite film 100.

In an embodiment, b = a +1, thereby providing that the second film layers 120 of the b layer are sequentially arranged at intervals and form a number of interval spaces, the first film layers 110 of the a layer are respectively filled in the a number of interval spaces, thereby forming the interference film layers, both of which have high refractive index second film layers 120 at opposite ends in the optical path direction, and one of the second film layers 120 at the two ends is connected to the low-refractive layer 130 to form the composite film 100.

In a preferred embodiment, the total number of layers of the composite film 100 is c, c = a + b +1, and c ranges from 6 to 10. It will be appreciated that with reference to the above examples, as the total number of layers c of the composite film 100 is increased, the total thickness of the layers of the composite film 100 is increased. The average reflectivity also decreases, but when the total number of layers of the composite film 100 is greater than 10, the process of the composite film 100 is more complicated and the cost is increased; when the total number of layers of the composite film 100 is less than 6, this may result in a reduction in antireflection bandwidth, affecting optical performance.

In an embodiment, c =8 is selected, that is, the total number of the layers of the composite film 100 is eight, and the composite film includes four second film layers 120 and three first film layers 110, the four second film layers 120 are arranged at intervals, and the three first film layers 110 are respectively filled between two adjacent second film layers 120.

Further, referring to fig. 3, in another embodiment, the lens 10 further includes a film structure 1 disposed on a side of the substrate 200 away from the composite film 100, wherein the composite film 100 is disposed on a side close to the object side, and the film structure 1 is disposed on a side close to the image side; referring to fig. 4, L2 is a spectrum curve of the lens 10 corresponding to the prior art with the film structure 1; the L1 curve is a spectrum curve of the composite film 100 of the present embodiment when applied to one surface of the lens 10, and the reflectivity of the lens 10 is less than 0.22% at a wavelength of 425 and 725nm, as shown in the L10 of fig. 4. In other embodiments, c may be selected to be any one of 6, 7, 9, and 10.

In particular, in the preferred embodiment, the total number of layers of the composite film 100 is an even number. To provide superior imaging of the composite film 100, the seven-layer composite film 100 has a lower bandwidth and the nine-layer composite film 100 has a higher cost than the eight-layer composite film.

In a preferred embodiment, the low-break layer 130 is a magnesium difluoride layer. It is understood that the low-refractive layer 130 made of magnesium difluoride has a low refractive index, and particularly the refractive index n3 of the low-refractive layer 130 in this embodiment is 1.38, so that the low-refractive layer 130 at the outermost layer of the composite film 100 has a low refractive index, and thus the composite film 100 has a low reflectivity.

In a preferred embodiment, first film layer 110 is a SiOx layer, including but not limited to a silicon dioxide layer. It is understood that the first film layer 110 made of silicon dioxide has a lower refractive index than the first film layer 110, and the specific refractive index n1 is 1.46.

In a preferred embodiment, the second film layer 120 is a layer of TiOx, including but not limited to a layer of titanium dioxide or a layer of titanium pentoxide. It is understood that the second film layer 120 made of TiOx has a higher refractive index, and the refractive index n2 of the second film layer 120 in this embodiment is 2.35. The second film layer 120 is matched with the first film layer 110 with a low refractive index to form an interference film layer to counteract interference light entering the composite film 100, so that the light transmittance of the composite film 100 is improved, and the reflectivity of the composite film 100 is reduced, preferably, the second film layer 120 is a titanium pentoxide layer.

Specifically, in one embodiment, the substrate 200 is made of plastic. Such as a resin or the like.

In the lens 10 of the present embodiment, the composite film 100 of the above embodiment is disposed on one side of the substrate 200, so that the light transmittance of the lens 10 is improved, thereby improving the Ghost/Flare phenomenon caused by multiple reflections of light in the lens 10, and the usage effect is good.

Further, the lens assembly of the present embodiment has better imaging effect by disposing the lens 10 in the above embodiment, the Ghost/Flare phenomenon can be improved, and the optical imaging effect can be improved.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. The lens comprises a substrate and a composite film arranged on the surface of the substrate, and is characterized in that the composite film comprises a first film layer, a second film layer and a low-folding layer which are sequentially stacked, wherein the refractive index of the first film layer is n1, the refractive index of the second film layer is n2, and the refractive index of the low-folding layer is n 3; wherein n1< n2, n3< n1 and n3< 1.4.

2. The lens of claim 1, wherein the low fold layer is disposed outermost from the substrate.

3. The lens according to claim 2, wherein the composite film comprises a layers of the first film and b layers of the second film, the layers of the first film and the second film being alternately arranged in a direction away from the low fold layer; a >1 and b > 1.

4. The lens according to claim 3, characterized in that the total number of layers of the composite film is c layers, c = a + b +1, and c ranges from 6-10.

5. The lens according to claim 4, wherein the total number c of the layers of the composite film is 8, which includes four layers of the second film layers and three layers of the first film layers, the four layers of the second film layers are arranged at intervals, and the three layers of the first film layers are respectively filled between two adjacent second film layers; the reflectivity of the composite film is less than 0.22% at the wavelength of 425-725 nm.

6. The lens according to any one of claims 4 to 5, characterized in that the total number of layers of the composite film is even.

7. The lens of claim 1, wherein the low refractive layer is a magnesium difluoride layer.

8. The lens of claim 1, wherein the first film layer is a silicon dioxide layer and the second film layer is a titanium dioxide layer or a tri-titanium pentoxide layer.

9. The lens of claim 1, wherein the substrate is plastic.

10. A lens assembly comprising the lens of any one of claims 1-9.