Infrared cut-off filter

Abstract

The utility model discloses an infrared cut-off filter, comprising an outer protective shell which comprises an upper positioning ring and a lower positioning ring; the cut-off filter layer comprises a blue glass substrate, and the top and the bottom of the blue glass substrate are respectively provided with an infrared ray absorption film and an infrared ray reflection film; the outer protection plate comprises a blue glass top plate and a blue glass bottom plate, the upper positioning ring and the lower positioning ring are fixedly connected, and fixing grooves are formed in the sides, close to each other, of the upper positioning ring and the lower positioning ring. According to the utility model, through mutual cooperation among the outer protective shell, the cut-off filtering layer and the outer protective plate, on the basis of the blue glass optical filter with the same thickness, through the layered clamping design of blue glass, the absorption and filtering efficiency of infrared light can be ensured, and meanwhile, the direct contact between an infrared absorption film and a reflecting film and the outside can be avoided; and the infrared ray absorbing film and the reflecting film are protected, so that the blue glass optical filter can be better put into use.

Description

Technical Field

[0001] The utility model relates to the technical field of optical filters, in particular to an infrared cut-off optical filter. Background Technique

[0002] An optical filter is an optical device used to select the required radiation band. An infrared cut-off optical filter is to alternately deposit optical films with high and low refractive indices on an optical substrate by using precision optical coating technology, which is used to eliminate the influence of infrared light on CCD / CMOS imaging, and is mainly applied to various digital imaging fields such as various cameras. By adding an infrared cut-off optical filter to the imaging system to block the infrared light that interferes with the imaging quality, the formed image can be made more in line with the best perception of the human eye.

[0003] At present, for the existing blue glass infrared cut-off optical filter, an infrared absorption film, a reflection film, etc. are often attached to the outside of the blue glass plate during use. Dust is likely to accumulate on the surface during storage and transportation. During the wiping process before use, there is a possibility of scratching the optical filter. Once the optical filter is scratched or worn, it will affect the use of subsequent equipment. Therefore, we propose to design an infrared cut-off optical filter. Content of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] To solve the above technical problems, according to one aspect of the utility model, the following technical solutions are provided:

[0006] An infrared cut-off optical filter, comprising:

[0007] An outer protective shell, the outer protective shell includes an upper positioning ring and a lower positioning ring;

[0008] A cut-off filter layer, the cut-off filter layer includes a blue glass substrate, and an infrared absorption film and an infrared reflection film are respectively arranged on the top and bottom of the blue glass substrate;

[0009] An outer protective plate, the outer protective plate includes a blue glass top plate and a blue glass bottom plate.

[0010] As a preferred scheme of the infrared cut-off optical filter described in the utility model, wherein, the upper positioning ring and the lower positioning ring are fixedly connected, fixing grooves are respectively opened on the sides of the upper positioning ring and the lower positioning ring close to each other, and the blue glass substrate is fixedly connected to the inner wall of the fixing groove, which is convenient for fixing the blue glass substrate.

[0011] As a preferred embodiment of the infrared cut-off filter of the present utility model, the infrared absorption film and the infrared reflection film are respectively attached to both sides of the blue glass substrate. The sides of the blue glass top plate and the blue glass bottom plate that are close to each other are respectively attached to the infrared absorption film and the infrared reflection film. Through the infrared absorption film and the infrared reflection film on both sides of the blue glass substrate, it is convenient to reflect and absorb and filter infrared light. At the same time, by using the external blue glass top plate and the blue glass bottom plate, it is convenient to protect the infrared absorption film and the infrared reflection film and prevent the film layer from being damaged.

[0012] As a preferred embodiment of the infrared cut-off filter of the present utility model, installation grooves are respectively formed on the sides of the upper positioning ring and the lower positioning ring that are away from each other. The outer side walls of the blue glass top plate and the blue glass bottom plate are respectively threadedly connected to the inner walls of the corresponding installation grooves. When the blue glass top plate and the blue glass bottom plate are worn and thus affect the use, it is convenient to disassemble and replace the blue glass top plate and the blue glass bottom plate.

[0013] As a preferred embodiment of the infrared cut-off filter of the present utility model, chamfers are respectively provided at the outer edges of the sides of the upper positioning ring and the lower positioning ring that are away from each other. When taking the filter, it is not easy to cut the hand, and at the same time, the periphery of the filter is not easily damaged, thereby reducing the damage to the overall filter.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] Through the mutual cooperation among the outer protective shell, the cut-off filter layer and the outer protective plate, on the basis of the blue glass filter with the same thickness, through the blue glass layered clamping design, not only can the absorption and filtration efficiency of infrared light be ensured, but also the infrared absorption film and the reflection film can be prevented from directly contacting the outside world, playing a protective role for the infrared absorption film and the reflection film, so that the blue glass filter can be better put into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the present utility model will be described in detail below in conjunction with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0017] Figure 1 is the external view schematic diagram of the infrared cut-off filter of the present utility model;

[0018] Figure 2 is the structural schematic of the infrared cut-off filter of the present utility model Figure 1 ;

[0019] Figure 3 Structural schematic of the infrared cut-off filter of the present utility model Figure 2 ;

[0020] Figure 4 Cross-sectional view of the infrared cut-off filter of the present utility model

[0021] Legend: 1. Outer protective shell; 101. Upper positioning ring; 102. Lower positioning ring; 103. Fixed groove; 104. Installation groove; 105. Chamfer; 2. Cut-off filter layer; 201. Blue glass substrate; 202. Infrared absorption film; 203. Infrared reflection film; 3. Outer protection plate; 301. Blue glass top plate; 302. Blue glass bottom plate Specific embodiments

[0022] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings

[0023] Secondly, the present utility model will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present utility model in detail, for the convenience of description, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included

[0024] In order to make the purpose, technical solution and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings

[0025] Please refer to Figures 1-4 , the present utility model provides an infrared cut-off filter, including:

[0026] An outer protective shell 1, the outer protective shell 1 includes an upper positioning ring 101 and a lower positioning ring 102. Chamfers 105 are provided at the outer edges of the mutually remote sides of the upper positioning ring 101 and the lower positioning ring 102, which are not easy to cut hands when taking the filter, and at the same time the periphery of the filter is not easy to be damaged, thereby reducing the overall damage to the filter

[0027] A cut-off filter layer 2, the cut-off filter layer 2 includes a blue glass substrate 201, and an infrared absorption film 202 and an infrared reflection film 203 are respectively provided on the top and bottom of the blue glass substrate 201

[0028] Among them, the upper positioning ring 101 and the lower positioning ring 102 are fixedly connected, and fixing grooves 103 are respectively provided on the mutually close sides of the upper positioning ring 101 and the lower positioning ring 102, and the blue glass substrate 201 is fixedly connected to the inner wall of the fixing groove 103, which is convenient for fixing the blue glass substrate 201

[0029] The outer protection plate 3 includes a blue glass top plate 301 and a blue glass bottom plate 302. Installation grooves 104 are formed on the sides of the upper positioning ring 101 and the lower positioning ring 102 that are away from each other. The outer side walls of the blue glass top plate 301 and the blue glass bottom plate 302 are threadedly connected to the inner walls of the corresponding installation grooves 104. When the blue glass top plate 301 and the blue glass bottom plate 302 are worn and thus affect the use, the blue glass top plate 301 and the blue glass bottom plate 302 can be conveniently disassembled and replaced.

[0030] The infrared absorption film 202 and the infrared reflection film 203 are respectively attached to both sides of the blue glass substrate 201. The sides of the blue glass top plate 301 and the blue glass bottom plate 302 that are close to each other are respectively attached to the infrared absorption film 202 and the infrared reflection film 203. Through the infrared absorption film 202 and the infrared reflection film 203 on both sides of the blue glass substrate 201, it is convenient to reflect and absorb and filter infrared light. At the same time, by using the external blue glass top plate 301 and blue glass bottom plate 302, it is convenient to protect the infrared absorption film 202 and the infrared reflection film 203 and prevent the film layers from being damaged.

[0031] During storage and transportation, when dust falls on the outside of the filter, the blue glass top plate 301 and the blue glass bottom plate 302 can be wiped, avoiding the direct contact of the infrared absorption film 202 and the infrared reflection film 203 with the external environment and protecting the quality of the infrared absorption film 202 and the infrared reflection film 203.

[0032] If the blue glass top plate 301 and the blue glass bottom plate 302 are worn, they can be adsorbed on the outer surfaces of the blue glass top plate 301 and the blue glass bottom plate 302 through a suction cup, and the plate surface can be turned to disassemble and replace them.

[0033] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. Infrared cut-off filter, characterized in that: include: An outer protective shell (1), the outer protective shell (1) comprising an upper positioning ring (101) and a lower positioning ring (102); A cut-off filter layer (2), the cut-off filter layer (2) comprising a blue glass substrate (201), the top and bottom of the blue glass substrate (201) being provided with an infrared absorption film (202) and an infrared reflection film (203), respectively; An outer guard plate (3), wherein the outer guard plate (3) comprises a blue glass top plate (301) and a blue glass bottom plate (302).

2. The infrared cutoff filter according to claim 1, characterized in that: The upper positioning ring (101) and the lower positioning ring (102) are fixedly connected, and a fixing groove (103) is provided on one side of the upper positioning ring (101) and the lower positioning ring (102) close to each other, and the blue glass substrate (201) is fixedly connected to the inner wall of the fixing groove (103).

3. The infrared cutoff filter according to claim 1, characterized in that: The infrared absorbing film (202) and the infrared reflecting film (203) are respectively bonded to the two sides of the blue glass substrate (201), and the sides of the blue glass top plate (301) and the blue glass bottom plate (302) close to each other are respectively bonded to the infrared absorbing film (202) and the infrared reflecting film (203).

4. The infrared cutoff filter according to claim 1, characterized in that: The upper positioning ring (101) and the lower positioning ring (102) are both provided with mounting grooves (104) on the sides away from each other, and the outer side walls of the blue glass top plate (301) and the blue glass bottom plate (302) are both threadedly connected to the inner walls of the corresponding mounting grooves (104).

5. The infrared cutoff filter according to claim 1, characterized in that: The upper positioning ring (101) and the lower positioning ring (102) are both provided with bevels (105) at their outer edges on the sides away from each other.

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