CN215116868U

CN215116868U - Optical filter

Info

Publication number: CN215116868U
Application number: CN202121322044.8U
Authority: CN
Inventors: 章艺锋; 聂鹏; 吴标平; 吴洽; 陈进文
Original assignee: Zhongshan Kaixuan Vacuum Science and Technology Co Ltd
Current assignee: Zhongshan Kaixuan Vacuum Science and Technology Co Ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2021-12-10
Anticipated expiration: 2031-06-11

Abstract

The utility model relates to the field of optical technology, a light filter is proposed, include: a transparent substrate comprising opposing first and second surfaces; a transparent conductive film disposed on the first surface; the light filter film is arranged on the transparent conductive film; and the antireflection film is arranged on the second surface. The transparent conductive film can play a role in shielding electromagnetic signals and has no great influence on the transmittance of infrared bands. The antireflection film can make the second surface perform antireflection in a visible light region, and the optical filter has an anti-dazzling function when being used in vehicle-mounted projects and the like, so that the optical filter has no dazzling and dazzling effects on opposite vehicle drivers or passers-by, and the safety coefficient is enhanced.

Description

Optical filter

Technical Field

The utility model relates to the field of optical technology, especially, relate to an optical filter.

Background

The requirements of technologies such as automobile unmanned driving, VR games and VR virtual reality on infrared anti-reflection filters are increasing day by day, the requirements of different application environments on the reflectivity and the transmittance of effective areas of infrared bands are inconsistent, and meanwhile, certain requirements are also provided for the visible color of human eyes on the front side.

SUMMERY OF THE UTILITY MODEL

The utility model provides an optical filter to improve the performance of optical filter.

The utility model provides an optical filter, include:

a transparent substrate comprising opposing first and second surfaces;

a transparent conductive film disposed on the first surface;

the light filter film is arranged on the transparent conductive film;

and the antireflection film is arranged on the second surface.

In one embodiment of the invention, the transparent substrate comprises glass, quartz, sapphire or silicate optical glass.

In one embodiment of the present invention, the transparent conductive film comprises indium tin oxide or zinc oxide.

In one embodiment of the present invention, the filter film includes a silicon dioxide layer and a hydrogenated amorphous silicon layer alternately stacked.

In one embodiment of the present invention, each hydrogenated amorphous silicon layer is located between adjacent silicon dioxide layers.

In one embodiment of the present invention, the thickness of the filter is 1383nm ± 10%.

In one embodiment of the present invention, the antireflection coating includes alternately stacked silicon dioxide layers and niobium pentoxide layers.

In one embodiment of the present invention, each niobium pentoxide layer is located between adjacent silicon dioxide layers.

In one embodiment of the present invention, the thickness of the antireflection film is 1130nm ± 10%.

In one embodiment of the present invention, the average transmittance of the visible light band from 420nm to 680nm is not less than 94.5%, the average transmittance of the antireflection film from 850nm to 1100nm is not less than 94.5%, and the reflectance of the incident light from 0 ° to 30 ° is not more than 0.3%.

The utility model discloses the light filter includes transparent basement, transparent conductive film, filter coating and antireflection coating, and transparent conductive film and antireflection coating set up respectively at transparent basement's first surface and second surface, and transparent conductive film can play electromagnetic signal shielding effect, and does not have great influence to infrared band transmissivity. The antireflection film can make the second surface perform antireflection in a visible light region, and the optical filter has an anti-dazzling function when being used in vehicle-mounted projects and the like, so that the optical filter has no dazzling and dazzling effects on opposite vehicle drivers or passers-by, and the safety coefficient is enhanced.

Drawings

The various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

fig. 1 is a schematic view illustrating a structure of an optical filter according to an exemplary embodiment;

FIG. 2 is a graph illustrating a single-sided infrared anti-reflection design for an optical filter according to an exemplary embodiment;

FIG. 3 is a graph illustrating a single-sided AR design of an optical filter according to an exemplary embodiment;

fig. 4 is a graph illustrating a double-sided coating test of an optical filter according to an exemplary embodiment.

The reference numerals are explained below:

10. a transparent substrate; 11. a first surface; 12. a second surface; 20. a transparent conductive film; 30. a light filtering film; 40. antireflection coating.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the disclosure may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized, and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the disclosure, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of this disclosure.

An embodiment of the present invention provides an optical filter, please refer to fig. 1, the optical filter includes: a transparent substrate 10, the transparent substrate 10 comprising opposing first and

second surfaces

11, 12; a transparent conductive film 20, the transparent conductive film 20 being disposed on the first surface 11; the filter film 30, the filter film 30 is set up on the transparent conductive film 20; an antireflective coating 40, antireflective coating 40 disposed on second surface 12.

The utility model discloses an optical filter includes transparent basement 10, transparent conductive film 20, filter coating 30 and antireflection coating 40, and transparent conductive film 20 and antireflection coating 40 set up respectively at transparent basement 10's first surface 11 and second surface 12, and transparent conductive film 20 can play the electromagnetic signal shielding effect, and does not have great influence to infrared band transmissivity. The antireflection film 40 can make the second surface 12 perform antireflection in a visible light region, and the optical filter has an anti-dazzling function when used in vehicle-mounted projects and the like, so that the anti-dazzling and anti-dazzling effects are achieved for drivers or passers-by of facing vehicles, and the safety coefficient is enhanced.

In one embodiment, the transparent substrate 10 comprises glass, quartz, sapphire or silicate optical glass, thereby ensuring good optical transmission. In this embodiment, the transparent substrate 10 may be glass, the transparent conductive film 20 and the filter film 30 are sequentially disposed on the first surface 11 of the glass, and the antireflection film 40 is disposed on the second surface 12 of the glass.

In one embodiment, the transparent conductive film 20 comprises Indium Tin Oxide (ITO) or zinc oxide (ZnO). In this embodiment, the transparent conductive film 20 is an indium tin oxide film, and the indium tin oxide film is disposed on the first surface 11 and can play a role in shielding electromagnetic signals. The transparent conductive film 20 has a large forbidden bandwidth, and absorbs only ultraviolet light but not visible light.

In one embodiment, the filter film 30 includes alternately stacked silicon dioxide layers and hydrogenated amorphous silicon layers. The hydrogenated amorphous silicon layer is used as an infrared anti-reflection material, a transparent conductive film 20 is plated on the first surface 11, the transparent conductive film 20 can be an ITO film, the resistance is about 80 omega, a band-pass filter, namely a filter film 30 is plated to enable the transparent conductive film to look black from the second surface 12, an AR film system, namely an anti-reflection film 40 is designed on the second surface 12 to increase the anti-reflection in a visible light region and an infrared effective region, the reflection can be reduced in the visible light region, the anti-reflection film has an anti-dazzling function when being used on vehicles and other projects, and the anti-dazzling and anti-reflection film plays a role in preventing dazzling and enhancing safety coefficient for drivers or passersby facing vehicles and passersby using the anti-reflection film.

In one embodiment, each hydrogenated amorphous silicon layer is located between adjacent silicon dioxide layers. The thickness of the filter 30 is 1383nm + -10%, i.e. the thickness of the filter 30 is 1244.7nm-1521.3 nm. Optionally, the thickness of the filter film 30 is 1383.43 nm.

In this embodiment, the specific design for the filter film 30 can be as follows:

it should be noted that, when the filter film 30 includes alternately stacked silicon dioxide layers and hydrogenated amorphous silicon layers, and the specific design is the above-mentioned value, the corresponding single-sided infrared anti-reflection design curve is shown in fig. 2.

In one embodiment, antireflective coating 40 comprises alternating layers of silicon dioxide and niobium pentoxide stacked together. Each niobium pentoxide layer is located between adjacent silicon dioxide layers.

In one embodiment, antireflective film 40 has a thickness of 1130nm ± 10%, i.e., antireflective film 40 has a thickness of 1017nm-1243 nm. Optionally, the thickness of antireflective coating 40 is 1130.18 nm.

In this embodiment, the specific design of antireflection film 40 may be as follows:

it should be noted that when the antireflection film 40 includes silicon dioxide layers and niobium pentoxide layers alternately stacked, and the specific design is as shown in the above table, the corresponding single-sided AR design curve is shown in fig. 3.

In one embodiment, the average transmittance of the antireflection film 40 in the visible light band of 420nm to 680nm is not less than 94.5%, the average transmittance of the antireflection film 40 in the infrared band of 850nm to 1100nm is not less than 94.5%, and the reflectance of incident light of 0 ° to 30 ° is not more than 0.3%. Furthermore, the transmittance of the antireflection film 40(AR) in a visible light band (such as a conventional band 420 nm-680 nm) is equal to or more than 94.5% on average, the antireflection area required to be at any 50nm in an infrared band 850 nm-1100 nm is equal to or more than 94.5% on average, the maximum is 95.5%, and the reflectivity of an infrared effective area of incident light of 0-30 degrees is equal to or less than 0.3%.

It should be noted that when the filter film 30 includes alternately stacked silicon dioxide layers and hydrogenated amorphous silicon layers and is specifically designed as the above table, and when the antireflection film 40 includes alternately stacked silicon dioxide layers and niobium pentoxide layers and is specifically designed as the above table, the double-sided coating test graph of the filter is shown in fig. 4.

The utility model discloses an optical filter is because first surface 11 plates infrared anti-reflection optical filter (filter coating 30) and has the visible light height and ends, and infrared operating band is high to be seen through, and whole first surface 11 and second surface 12 visible light region transmissivity is less than or equal to 1%, and infrared operating band is more than or equal to 97.5%. The utility model discloses an arbitrary 50nm effective area incident light 0 in the possible bandwidth 850nm ~ 1100nm is less than or equal to 0.5% to 30 overall reflectivity, and the transmissivity more than or equal to 97.5%. In some embodiments, the optical filter can be black from the second surface 12, L value is 6 ~ 30, A value 2, B value 8 ~ 2, and can adjust the parameter and accomplish other various colours, such as gold etc..

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and exemplary embodiments be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An optical filter, comprising:

a transparent substrate (10), the transparent substrate (10) comprising opposing first (11) and second (12) surfaces;

a transparent conductive film (20), the transparent conductive film (20) being disposed on the first surface (11);

a filter film (30), wherein the filter film (30) is arranged on the transparent conductive film (20);

an antireflective coating (40), the antireflective coating (40) disposed on the second surface (12).

2. A filter according to claim 1, characterised in that the transparent substrate (10) comprises glass, quartz, sapphire or silicate optical glass.

3. A filter as claimed in claim 1, characterised in that the transparent conductive film (20) comprises indium tin oxide or zinc oxide.

4. A filter according to claim 1, characterised in that the filter film (30) comprises alternating superimposed layers of silicon dioxide and hydrogenated amorphous silicon.

5. The filter of claim 4, wherein each hydrogenated amorphous silicon layer is located between adjacent silicon dioxide layers.

6. An optical filter according to claim 4 or 5, characterised in that the thickness of the filter film (30) is 1383nm ± 10%.

7. The filter according to claim 1, wherein the antireflection film (40) comprises alternating layers of silicon dioxide and niobium pentoxide superimposed.

8. The optical filter of claim 7, wherein each of the niobium pentoxide layers is located between adjacent silicon dioxide layers.

9. An optical filter according to claim 7 or 8, wherein the antireflection film (40) has a thickness of 1130nm ± 10%.

10. The optical filter according to claim 7, wherein the average transmittance of the antireflection film (40) in the visible light band of 420nm to 680nm is not less than 94.5%, the average transmittance of the antireflection film (40) in the infrared band of 850nm to 1100nm is not less than 94.5%, and the reflectance of incident light of 0 ° to 30 ° is not more than 0.3%.