Curved-surface light filter disc

Abstract

The utility model discloses a curved surface optical filter, which comprises a substrate layer, the substrate layer is provided with an object surface side and an image surface side which are back to back, the surface type of the object surface side is set to be a spherical surface type or a free-form surface type, and the surface type of the image surface side is set to be a spherical surface type or a free-form surface type; the coating layer is attached to one side of the object plane side and / or the image plane side; the blackening layer is arranged at the peripheral edge position, except the object plane side and the image plane side, of the substrate layer in a covering manner; when the coating layer is attached to the object surface side, the curvature radius of the surface, attached to the object surface side, of the coating layer is the same as that of the object surface side. When the film coating layer is attached to the image surface side, the curvature radius of the surface, attached to the image surface side, of the film coating layer is the same as that of the image surface side. Through the structure of the utility model, the aberration can be corrected while light filtering is realized through the substrate layer with curvature, and stray light can be reduced.

Description

Technical Field

[0001] The utility model relates to a filter, in particular to a curved surface light filter. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] Filters are optical devices that selectively transmit light of specific wavelengths while blocking other wavelengths. They are widely used in photography, scientific experiments, optical instruments and other fields. Filters can be manufactured based on different principles and materials, such as color filters, thin film filters, etc., to meet various specific optical needs.

[0004] At present, the filters used in various lenses are all flat glass, which only filter wavelengths but cannot correct the optical path. If aberrations are to be corrected, additional lenses must be introduced. With the trend of lens size becoming smaller and smaller, the larger the number of lens components, the more difficult it is to achieve miniaturization of the lens when the same imaging effect is achieved. In addition, the surface and edges of ordinary flat filters are more likely to cause unnecessary stray light, and the edge size needs to be adjusted back and forth to reduce the impact of stray light, affecting the practical efficiency of the lens.

[0005] Currently, there is no curved optical filter that can solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a curved optical filter which can filter light and correct aberrations at the same time through a base layer with a curvature.

[0007] In order to achieve the above-mentioned object, the utility model discloses the following curved surface light filter, the curved surface light filter comprising:

[0008] A base layer, wherein the base layer has an object surface side and an image surface side opposite to each other, the surface shape of the object surface side is set to a spherical surface shape or a free-form surface shape, and the surface shape of the image surface side is set to a spherical surface shape or a free-form surface shape;

[0009] A coating layer, the coating layer being laminated and arranged on one side of the object plane side and / or the image plane side;

[0010] A black coating layer, wherein the black coating layer is arranged to cover the peripheral edge positions of the base layer outside the object plane side and the image plane side;

[0011] Among them, when the coating layer is in contact with the object surface side, the side of the coating layer in contact with the object surface side has the same curvature radius as the object surface side; when the coating layer is in contact with the image surface side, the side of the coating layer in contact with the image surface side has the same curvature radius as the image surface side.

[0012] Furthermore, it also includes two transparent sheet layers, one of which is bonded to the object surface side, and the other of which is bonded to the image surface side.

[0013] Furthermore, a surface of the transparent sheet layer bonded to the object side has the same curvature radius as that of the object side; a surface of the transparent sheet layer bonded to the image side has the same curvature radius as that of the image side.

[0014] Furthermore, the curvature radii of two surfaces of the transparent sheet layer and the coating layer that are bonded to each other are the same.

[0015] Furthermore, the surface shapes of the object surface side and the image surface side are set to be spherical surface shapes.

[0016] Furthermore, the thickness of the curved optical filter is between 0.1-10 mm.

[0017] Furthermore, the coating layer is configured as an anti-reflection coating, an infrared cut-off coating, or a composite film of an anti-reflection coating and an infrared cut-off coating.

[0018] Furthermore, the coating layer which is configured as an anti-reflection coating and an anti-reflection coating and an infrared cut-off composite film is arranged on one side of the object plane.

[0019] Furthermore, the coating film configured as an infrared cut-off coating film is disposed on the image plane side.

[0020] Furthermore, the material of the base layer is one of glass, resin, and crystal transparent solid materials, and the curvature radius of the base layer is in the range of 8-40 mm.

[0021] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0022] 1. The curved optical filter of the utility model has a base layer with a certain curvature, and both sides of the base layer have coating layers with matching curvatures, so that the curved optical filter of the utility model can correct aberrations while filtering light, reducing the number of original lens layers and contributing to the miniaturization of the lens.

[0023] 2. The top of the curved optical filter of the utility model includes an arc-shaped portion, and the stray light at the edge of the lens is reduced by setting a black coating layer at the peripheral edge positions of the base layer outside the object plane side and the image plane side. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 This is the single-layer morphology of the coating layer of a curved optical filter provided in the embodiments of this specification;

[0026] Figure 2 This is a three-layer morphology of an anti-reflection coating and an infrared cut-off film of a curved optical filter provided in an embodiment of this specification;

[0027] Figure 3 This is the intention of the four-layer anti-reflection coating of a curved optical filter provided in the embodiment of this specification;

[0028] Figure 4 This is the five-layer morphology intention of an anti-reflection coating of a curved optical filter provided in the embodiment of this specification;

[0029] Figure 5 This is a five-layer morphology of an anti-reflection coating and an infrared cut-off film of a curved optical filter provided in an embodiment of this specification;

[0030] Figure 6 This is a four-layer morphology of an anti-reflection coating and an infrared cutoff composite film of a curved optical filter provided in an embodiment of this specification;

[0031] In the figure: 1, base layer; 11, object side; 12, image side; 2, coating layer; 21, anti-reflection coating; 22, infrared cut-off coating; 23, anti-reflection coating and infrared cut-off composite film; 3, black coating layer; 4, transparent sheet layer. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0033] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0034] See also Figure 1 , is a curved light filter of this embodiment, and the curved light filter includes:

[0035] A base layer 1, wherein the base layer 1 has an object side 11 and an image side 12 opposite to each other, the surface shape of the object side 11 is set to be a spherical surface shape or a free-form surface shape, and the surface shape of the image side 12 is set to be a spherical surface shape or a free-form surface shape;

[0036] A coating layer 2, the coating layer 2 is laminated on one side of the object side 11 and / or the image side 12;

[0037] A black coating layer 3, the black coating layer 3 is arranged to cover the peripheral edges of the base layer 1 outside the object plane side 11 and the image plane side 12;

[0038] Among them, when the coating layer 2 is bonded to the object side 11, the side of the coating layer 2 bonded to the object side 11 has the same curvature radius as the object side 11; when the coating layer 2 is bonded to the image side 12, the side of the coating layer 2 bonded to the image side 12 has the same curvature radius as the image side 12.

[0039] With the above structure, when in use, light is emitted from the object side 11 of the base layer 1 to the image side 12, such as Figure 1As shown, since the light first passes through the coating layer 2 on the object side 11, a certain degree of filtering effect can be achieved by processing the light with the help of the coating layer 2, and then the light filtered by the coating layer 2 passes through the base layer 1. Since the base layer 1 is set to a spherical surface or a free-form surface with a preset curvature radius, the direction of the light is corrected after the light passes through the base layer 1. That is to say, through the structure in Example 1, while the light completes the filtering operation, due to the existence of the curvature radius of the base layer 1, the light also obtains aberration correction. Compared with the existing method that requires multiple lenses to correct and filter the light in steps, only a single curved light filter can simultaneously achieve the above two purposes, so it is more conducive to miniaturization of the overall lens setting.

[0040] At the same time, since the base layer 1 in this embodiment has a preset curvature radius, compared with the existing ordinary flat filter, the base layer 1 with a preset curvature radius can be further optimized and reduced through optical path design to reduce the edge stray light generated by the light. At the same time, the black layer coated on the edge positions around the base layer 1 can further avoid the influence of edge stray light, thereby achieving better imaging effect.

[0041] Please see Figure 2 In the embodiment 1 shown, one side of the object side 11 includes an anti-reflection coating 21, and one side of the image side 12 includes an infrared cut-off coating 22, wherein the anti-reflection coating 21 is used to reduce reflection and improve transmittance, while the infrared cut-off coating 22 is used to filter infrared light waves in a specific range. That is to say, the curved optical filter in embodiment 1 can reduce reflection through the anti-reflection coating 21, and further reduce the influence of infrared rays with the help of the infrared cut-off coating 22. Specifically, when the wavelength of the infrared cut-off coating 22 in Example 1 is less than 380nm, the transmittance T is less than 10%, preferably less than 5%, and more preferably less than 2%; the transmittance T of the infrared cut-off coating 22 at a wavelength of 380nm±10nm, preferably 380nm±5nm is 50%, and more preferably less than 50%; the transmittance T of the infrared cut-off coating 22 between wavelengths of 380-650nm is greater than 90%, and preferably greater than 95%; the transmittance T of the infrared cut-off coating 22 at a wavelength of 650nm±10nm, preferably 650nm±5nm is 50%, and more preferably less than 50%; the transmittance T of the infrared cut-off coating 22 between wavelengths of 650-1500nm is less than 10%, preferably less than 5%, and more preferably less than 2%. The above wavelength limitation of the infrared cut-off coating 22 is intended to further improve the use effect of the infrared cut-off coating 22 on the substrate layer 1 having a preset radius of curvature.

[0042] Please see Figure 3In the embodiment 2 shown, transparent sheets 4 are further provided on both sides of the base layer 1, wherein one transparent sheet 4 is provided in contact with the object side 11, and the other transparent sheet 4 is provided in contact with the image side 12. At the same time, an anti-reflection coating 21 is also provided on the outer side of the transparent sheet 4 on the object side 11. With the provision of the transparent sheet 4, the physical protection effect on the surface of the base layer 1 can be further achieved. At the same time, the anti-reflection coating 21 is placed on the outermost side that first contacts the light source, which avoids the possibility of crystallization when the absorption-type base layer 1 (such as the base layer 1 in the embodiment 2 is set as blue glass) is irradiated with light and stored for a long time, resulting in the possibility of product damage, and further prolonging the service life of the curved light filter in the embodiment 2. At the same time, the absorption-type base layer 1 can be directly used in the embodiment 2 to further avoid the influence of stray light and reduce the ghost phenomenon.

[0043] Please see Figure 4 In the embodiment 3 shown, a layer of anti-reflection coating 21 is provided on both sides of the base layer 1 after being protected by the transparent sheet layer 4. The anti-reflection coating 21 is attached to the outer side of the transparent sheet layer 4. The front and rear layers of the anti-reflection coating 21 can play a superimposed anti-reflection role, further improve the transmittance, and provide protection, so that when an absorption-type base layer 1 is used, the curved light filter in embodiment 4 can obtain a longer service life.

[0044] Please see Figure 5 In the embodiment 4 shown, a coating layer 2 is disposed on both sides of the base layer 1 protected by the transparent sheet layer 4, wherein the transparent sheet layer 4 attached near the object side 11 is provided with an anti-reflection coating 21, and the transparent sheet layer 4 attached near the image side 12 is provided with an infrared cut-off coating 22. The infrared cut-off coating 22 can filter the infrared light band together with the absorption-type base layer 1, while the anti-reflection coating 21 disposed on the outermost side is used to improve the high transmittance and provide protection.

[0045] Please see Figure 6 In the embodiment 5 shown, a layer of anti-reflection coating and infrared cut-off composite film 23 is arranged on the outer side of the object side 11 of the base layer 1 after being protected by the transparent sheet layer 4. The anti-reflection coating and infrared cut-off composite film 23 can simultaneously filter the infrared light band and improve the transmittance, and provide protection. Compared with the traditional method of separately setting a layer of anti-reflection coating 21 and infrared cut-off coating 22, the anti-reflection coating and infrared cut-off composite film 23 with a composite functional structure can simplify the structure of the curved light filter and improve the flexibility of the arrangement of the coating layer 2.

[0046] Furthermore, the thickness of the curved optical filter is between 0.1-10 mm, preferably between 0.2-5 mm. The curved optical filter with a preset radius of curvature within the above thickness range is easier to process and has a more stable correction effect.

[0047] It is worth noting that in the above-mentioned embodiments 1-5, the two surfaces adjacent to and bonded between all layers have the same radius of curvature and are all set to a spherical surface type, so as to reduce the difficulty of production on the basis of meeting the preset correction effect. At the same time, the material of the base layer 1 can be a transparent solid material such as glass, resin, crystal, etc., preferably a glass material, which has better chemical stability and heat resistance, and is more conducive to the manufacture and long-term use of the base layer 1 with a preset radius of curvature, and the range of the radius of curvature of the base layer is 8-40mm.

[0048] Although different specific embodiments are mentioned in the content of this application, this application is not limited to the situations described in the industry standards or embodiments, etc. Some industry standards or slightly modified implementation plans based on the implementation of the custom methods or embodiments can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above embodiments. The embodiments of data acquisition, processing, output, judgment methods, etc. after these modifications or deformations can still fall within the scope of the optional implementation plans of this application.

[0049] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A curved optical filter, characterized in that: The curved optical filter comprises: A base layer, wherein the base layer has an object surface side and an image surface side opposite to each other, the surface shape of the object surface side is set to a spherical surface shape or a free-form surface shape, and the surface shape of the image surface side is set to a spherical surface shape or a free-form surface shape; A coating layer, the coating layer being laminated and arranged on one side of the object plane side and / or the image plane side; A black coating layer, wherein the black coating layer is arranged to cover the peripheral edge positions of the base layer outside the object plane side and the image plane side; Among them, when the coating layer is in contact with the object surface side, the side of the coating layer in contact with the object surface side has the same curvature radius as the object surface side; when the coating layer is in contact with the image surface side, the side of the coating layer in contact with the image surface side has the same curvature radius as the image surface side.

2. The curved optical filter according to claim 1, characterized in that: It also includes two transparent sheet layers, one of which is bonded to the object surface side, and the other of which is bonded to the image surface side.

3. The curved optical filter according to claim 2, characterized in that: The surface of the transparent sheet layer that is bonded to the object surface side has the same curvature radius as the object surface side; the surface of the transparent sheet layer that is bonded to the image surface side has the same curvature radius as the image surface side.

4. The curved optical filter according to claim 2, characterized in that: The curvature radii of two surfaces of the transparent sheet layer and the coating layer that are bonded to each other are the same.

5. The curved optical filter according to claim 1, characterized in that: The surface shapes of the object surface side and the image surface side are set to be spherical surface shapes.

6. The curved optical filter according to claim 1, characterized in that: The thickness of the curved optical filter is between 0.1 and 10 mm.

7. The curved optical filter according to claim 1, characterized in that: The coating layer is configured as an anti-reflection coating, an infrared cut-off coating, or a composite film of an anti-reflection coating and an infrared cut-off coating.

8. The curved optical filter according to claim 7, characterized in that: The coating layer configured as an anti-reflection coating and an anti-reflection coating and an infrared cut-off composite film is arranged on one side of the object surface.

9. The curved optical filter according to claim 7, characterized in that: The coating film, which is set as an infrared cut-off coating film, is set on the image plane side.

10. The curved optical filter according to claim 1, characterized in that: The material of the base layer is one of glass, resin, and crystal transparent solid materials, and the curvature radius of the base layer is in the range of 8-40 mm.

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