CN215180973U

CN215180973U - Optical lens

Info

Publication number: CN215180973U
Application number: CN202023256016.9U
Authority: CN
Inventors: 陈怀玉; 王佳; 王萍萍
Original assignee: Changzhou Ruitai Photoelectric Co Ltd; AAC Optics Shenzhen Co Ltd
Current assignee: Changzhou Ruitai Photoelectric Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-12-14
Anticipated expiration: 2030-12-29

Abstract

The utility model provides an optical lens piece, include: the anti-reflection film comprises a glass lens substrate, an anti-reflection film arranged on the glass lens substrate and a sub-wavelength structure anti-reflection film arranged on the anti-reflection film; the sub-wavelength structure anti-reflection film is provided with a graded refractive index, a plurality of bulges are formed on one surface of the sub-wavelength structure anti-reflection film, which is far away from the anti-reflection film, and the grain size of the bulges is smaller than the wavelength of visible light. The optical lens is characterized in that the antireflection film and the sub-wavelength structure antireflection film are sequentially arranged on the glass lens substrate, and the test example shows that the composite film layer formed by the antireflection film and the sub-wavelength structure antireflection film has the characteristics of lower reflectivity, wider bandwidth and stronger angle resistance.

Description

Optical lens

[ technical field ] A method for producing a semiconductor device

The utility model relates to a cell-phone camera lens technical field especially relates to an optical lens piece.

[ background of the invention ]

At present, the requirement of taking pictures in the mobile phone lens industry is high, wherein a large-curvature lens is easy to generate red Ghost (Ghost) and becomes a pain point of coating of an optical lens.

[ Utility model ] content

Accordingly, there is a need for an optical lens that avoids the generation of red ghost.

An optical lens, comprising: the anti-reflection film comprises a glass lens substrate, an anti-reflection film arranged on the glass lens substrate and a sub-wavelength structure anti-reflection film arranged on the anti-reflection film;

the sub-wavelength structure anti-reflection film is provided with a graded refractive index, a plurality of bulges are formed on one surface of the sub-wavelength structure anti-reflection film, which is far away from the anti-reflection film, and the grain size of the bulges is smaller than the wavelength of visible light.

In one embodiment, the protrusion is in the shape of a small top and a large bottom, and the tip of the protrusion is located at the apex of the protrusion.

In one embodiment, the protrusions are wedge-shaped, hemispherical, or semi-ellipsoidal.

In one embodiment, the subwavelength structure antireflection film comprises a first antireflection layer and a second antireflection layer, the glass lens substrate, the antireflection film, the first antireflection layer and the second antireflection layer are sequentially stacked, the refractive index of the first antireflection layer is greater than that of the second antireflection layer, and the protrusion is located on the surface of the second antireflection layer away from the first antireflection layer.

In one embodiment, the first frustrating and reflecting layer has a refractive index of 1.38 and the second frustrating and reflecting layer has a refractive index of 1.15.

In one embodiment, the sub-wavelength structured anti-reflection film is deposited from a plurality of particles, and the sub-wavelength structured anti-reflection film has a thickness of 100nm to 200 nm.

In one embodiment, the sub-wavelength structure anti-reflection film has a thickness of 150nm to 160nm, the first reflection suppressing layer has a thickness of 35nm to 45nm, the second reflection suppressing layer has a thickness of 110nm to 120nm, and the particles have an outer diameter of 60nm to 80 nm.

In one embodiment, the material of the sub-wavelength structure anti-reflection film is selected from at least one of silicon dioxide, silicon monoxide, and magnesium fluoride.

In one embodiment, the material of the subwavelength structured anti-reflection film includes the silicon oxide and the silicon monoxide in a mass ratio of 3: 1.

In one embodiment, the antireflection film is formed by alternately laminating high refractive films and low refractive films, the material of the high refractive films is selected from at least one of titanium oxide, zirconium oxide and niobium oxide, and the material of the low refractive films is selected from at least one of silicon-aluminum mixture, silicon oxide, magnesium fluoride and aluminum oxide.

The optical lens is characterized in that the antireflection film and the sub-wavelength structure antireflection film are sequentially arranged on the glass lens substrate, and the test example shows that the composite film layer formed by the antireflection film and the sub-wavelength structure antireflection film has the characteristics of lower reflectivity, wider bandwidth and stronger angle resistance.

[ description of the drawings ]

Fig. 1 is a schematic cross-sectional structure diagram of an optical lens according to an embodiment.

Fig. 2 is a schematic structural view of a glass lens substrate of the optical lens shown in fig. 1.

Fig. 3 is a reflectivity bandwidth test chart of the optical lens provided in the comparative example.

Fig. 4 is a reflectivity bandwidth test chart of the optical lens provided in the embodiment.

[ detailed description ] embodiments

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

An optical lens 100 according to an embodiment shown in fig. 1 and 2 includes: a glass lens substrate 120, an antireflection film 140(AR Coating) disposed on the glass lens substrate 120, and a Subwavelength structured antireflection film 160 (SWC) disposed on the antireflection film 140.

Specifically, the antireflection film 140 and the sub-wavelength structure antireflection film 160 are both located on the object side of the glass lens substrate 120, which can exert the effects of the antireflection film 140 and the sub-wavelength structure antireflection film 160.

In other embodiments, the antireflection film 140 and the subwavelength-structured antireflection film 160 may be provided on both the object-side surface and the image-side surface.

The subwavelength structure antireflection film 160 has a graded refractive index, a plurality of protrusions 162 are formed on one surface of the subwavelength structure antireflection film 160 away from the antireflection film 140, and the particle size of the protrusions 162 is smaller than the wavelength of visible light.

According to the optical lens 100, the antireflection film 140 and the sub-wavelength structure antireflection film 160 are sequentially arranged on the glass lens substrate 120, and the test example shows that a composite film layer formed by the antireflection film 140 and the sub-wavelength structure antireflection film 160 has the characteristics of lower reflectivity, wider bandwidth and stronger angle resistance, and compared with a traditional lens, the optical lens 100 can effectively reduce red ghost.

Specifically, when the optical lens 100 is used, the refractive index gradually changes from the apex to the root of the protrusion 162, thereby achieving the anti-reflection effect.

It should be noted that the particle size of the protrusions 162 is smaller than the wavelength of visible light, which means that the length, width and height of the protrusions 162 are smaller than the wavelength of visible light.

Referring to fig. 1, in the present embodiment, the protrusion 162 has a shape with a small top and a large bottom, and the tip of the protrusion 162 is located at the vertex of the protrusion 162.

Specifically, the protrusion 162 may be wedge-shaped, hemispherical, or semi-ellipsoidal.

Referring to fig. 1, in the present embodiment, the sub-wavelength antireflection film 160 includes a first reflection suppressing layer 164 and a second reflection suppressing layer 166, the glass lens substrate 120, the antireflection film 140, the first reflection suppressing layer 164, and the second reflection suppressing layer 166 are sequentially stacked, the refractive index of the first reflection suppressing layer 164 is greater than that of the second reflection suppressing layer 166, and the protrusion 162 is located on the surface of the second reflection suppressing layer 166 away from the first reflection suppressing layer 166.

The arrangement in which the refractive index of the first reflection suppressing layer 164 is different from the refractive index of the second reflection suppressing layer 166 can exert the antireflection effect of the subwavelength structure antireflection film 160.

In one specific embodiment, the first frustrating and reflective layer 164 has a refractive index of 1.38 and the second frustrating and reflective layer 166 has a refractive index of 1.15.

In the present embodiment, the sub-wavelength structure anti-reflection film 160 is formed by depositing a plurality of particles, and the thickness of the sub-wavelength structure anti-reflection film 160 is 100nm to 200 nm.

Preferably, the sub-wavelength structure anti-reflection film 160 has a thickness of 150nm to 160nm, the first reflection suppressing layer 164 has a thickness of 35nm to 45nm, the second reflection suppressing layer 166 has a thickness of 110nm to 120nm, and the outer diameter of the particles is 60nm to 80 nm.

Specifically, the plurality of particles on the surface of the second anti-reflective layer 166 away from the first anti-reflective layer 164 form the aforementioned protrusions 162.

In the present embodiment, the material of the subwavelength-structured antireflection film 160 is at least one selected from the group consisting of silicon dioxide, silicon monoxide, and magnesium fluoride.

Preferably, the material of the sub-wavelength structure anti-reflection film comprises silicon dioxide and silicon monoxide, and the mass ratio of the silicon dioxide to the silicon monoxide is 3: 1.

Referring to fig. 2, in the present embodiment, the curvature of the glass lens substrate 120 is large. At this time, the problem of red ghost may be well solved by the combination of the anti-reflection film 140 and the sub-wavelength structure anti-reflection film 160.

In this embodiment, the antireflection film 120 is formed by alternately laminating high refractive films and low refractive films, the high refractive film is made of at least one material selected from titanium oxide, zirconium oxide, and niobium oxide, and the low refractive film is made of at least one material selected from silicon-aluminum mixture, silicon oxide, magnesium fluoride, and aluminum oxide.

Test example

Reflectivity bandwidth test

The optical lens shown in fig. 2 on which an antireflection film and a subwavelength-structured antireflection film were deposited was provided as an example, and the optical lens shown in fig. 2 on which an antireflection film was deposited was provided as a comparative example.

Considering that the lens has a certain curvature, the thicknesses of the peripheral and central film layers are different when the film is coated.

The reflectance bandwidth test was performed at the Center (Lens Center) and 43 ° (Lens 43 °) of the optical lenses provided in the examples and comparative examples, respectively, to obtain fig. 3 and 4 in which the abscissa is the wavelength of light and the ordinate is the reflectance.

As can be seen from fig. 3 and 4, the Lens Center of the optical Lens of the embodiment has a maximum wavelength of 1000nm at a reflectance of 0.3% or less in the long-wave direction; while the Lens Center of the optical Lens of the comparative example has a maximum wavelength of 830nm at a reflectance of 0.3% or less in the long-wavelength direction.

As can be seen from fig. 3 and 4, Lens 43 ° inclination of the optical Lens of the embodiment is in the long wavelength direction, and the maximum wavelength with a reflectance of 1% or less is 900nm to 950 nm; while the Lens of the comparative example had Lens 43 ° inclination in the long wavelength direction, the maximum wavelength of reflectance of 1% or less was 700nm to 750 nm.

As can be seen from fig. 3 and 4, the film structure of the embodiment can reduce the reflectivity, and also has a good effect of suppressing the fluctuation of the reflectivity caused by the inconsistency of the films at the center and the periphery of the lens when the curvature of the lens is large.

Ghost real shot contrast

Film reliability test

The optical lenses provided in the examples were subjected to film layer reliability tests, and the specific test conditions and test results are shown in table 1 below.

TABLE 1

As can be seen from table 1, the optical lens provided in the embodiment has no appearance defect and good stability of the film layer in the reliability test of the film layer.

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. An optical lens, comprising: the anti-reflection film comprises a glass lens substrate, an anti-reflection film arranged on the glass lens substrate and a sub-wavelength structure anti-reflection film arranged on the anti-reflection film;

2. The optical lens according to claim 1 wherein the protrusion is shaped with a small top and a large bottom, and the tip of the protrusion is located at the apex of the protrusion.

3. The optical lens according to claim 2, wherein the protrusion is wedge-shaped, hemispherical or semi-ellipsoidal.

4. The optical lens according to any one of claims 1 to 3, wherein the subwavelength structure antireflection film comprises a first reflection suppressing layer and a second reflection suppressing layer, the glass lens substrate, the antireflection film, the first reflection suppressing layer and the second reflection suppressing layer are laminated in this order, the refractive index of the first reflection suppressing layer is higher than that of the second reflection suppressing layer, and the protrusions are located on the surface of the second reflection suppressing layer away from the first reflection suppressing layer.

5. The optical lens according to claim 4, wherein the refractive index of the first reflection-suppressing layer is 1.38 and the refractive index of the second reflection-suppressing layer is 1.15.

6. The optical lens of claim 4, wherein the sub-wavelength structured anti-reflective film is deposited from a plurality of particles, and wherein the sub-wavelength structured anti-reflective film has a thickness of 100nm to 200 nm.

7. The optical lens according to claim 6, wherein the thickness of the sub-wavelength structure anti-reflection film is 150nm to 160nm, the thickness of the first reflection suppressing layer is 35nm to 45nm, the thickness of the second reflection suppressing layer is 110nm to 120nm, and the outer diameter of the particle is 60nm to 80 nm.

8. The optical lens according to claim 6, wherein the material of the sub-wavelength structure antireflection film is one selected from the group consisting of silicon dioxide, silicon monoxide, and magnesium fluoride.

9. The optical lens according to any one of claims 1 to 3, wherein the antireflection film is formed by alternately laminating high refractive films and low refractive films.