Light splitting lens, imaging system and processing method of light splitting lens

Abstract

The invention discloses a beam splitting lens, an imaging system and a processing method of the beam splitting lens, and relates to the technical field of imaging systems.The beam splitting lens comprises a lens, a first spherical surface and a second spherical surface are oppositely arranged on the lens, and the lens is composed of an upper beam splitting lens, a lower beam splitting lens and a beam splitting film; the light splitting lens is formed by combining the two semi-transparent mirrors, when the light splitting lens is used, part of light rays penetrate through the light splitting lens, meanwhile, part of the light rays are reflected through the sixth face, the dual functions of imaging and light splitting are achieved, an imaging system does not need to be additionally provided with a light splitting prism, the size of a product is reduced, the weight of the product is light, and performance optimization of the product is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging systems, in particular to a light splitting lens, an imaging system and a processing method of the light splitting lens. BACKGROUND

[0002] Optical communication is a communication mode that uses light waves as a carrier to transmit information, and its core advantages include wide frequency band, large capacity, strong anti-electromagnetic interference and high security.

[0003] The current optical communication products generally use a prism for light splitting, that is, a light splitting prism is added in the imaging system to realize the reception of optical communication, and the prism needs to be added to the overall imaging system for aberration balancing. This method increases the weight and volume of the product, which is not conducive to the performance optimization of the product.

[0004] Therefore, there is an urgent need for a light splitting lens, an imaging system and a processing method of the light splitting lens. SUMMARY

[0005] In view of the problems existing in the prior art, the present application solves the problems by using the following technical structure.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: A light splitting lens, comprising: a lens, a first spherical surface and a second spherical surface are oppositely arranged on the lens, the lens is composed of a light splitting upper lens, a light splitting lower lens and a light splitting film; The outer surface of the light splitting upper lens comprises a first surface, a second surface and a third surface, the first surface and the third surface are respectively arranged on both sides of the second surface, and the second surface is a plane; The outer surface of the light splitting lower lens comprises a fifth surface, a sixth surface and a seventh surface, the fifth surface and the seventh surface are respectively arranged on both sides of the sixth surface, and the sixth surface is a plane; The first surface and the fifth surface form the first spherical surface, the third surface and the seventh surface form the second spherical surface, the light splitting film is arranged on the sixth surface, and the second surface and the sixth surface are oppositely arranged; The second surface and the sixth surface form an angle with the axis of the lens, and the angle between the second surface and the axis of the lens is equal to the angle between the sixth surface and the axis of the lens.

[0007] The second surface and the sixth surface do not intersect with the axis of the lens.

[0008] The first spherical surface and the second spherical surface are connected by a circular side surface, the outer surface of the upper light splitting lens further comprises a fourth surface, the outer surface of the lower light splitting lens further comprises an eighth surface, the fourth surface and the eighth surface are connected on both sides respectively, and the fourth surface and the eighth surface form a circular side surface.

[0009] The second surface and the sixth surface are glued by optical epoxy glue.

[0010] An imaging system comprises the light splitting lens.

[0011] A processing method of a light splitting lens, used for processing the light splitting lens, comprises two right-angle prisms. The method comprises: A light splitting film is coated on the inclined surface of one of the right-angle prisms; The inclined surfaces of the two right-angle prisms are faced and glued to form a raw material in the shape of a cuboid; The raw material is cut from one side of the triangle of the right-angle prism to divide the raw material into two glued prisms in the shape of a cuboid; The circumferential direction of the cut surface of the glued prism is ground to form a circular side surface; One side of the cut surface of the glued prism is milled according to the spherical curvature to form the first spherical surface, and the other side of the cut surface of the glued prism is milled according to the spherical curvature to form the second spherical surface; Finally, the glued prism is finely ground and polished to form the light splitting lens.

[0012] The central thickness of the light splitting lens is d1, the side length of the right-angle prism is d2, and the d1 and the d2 satisfy: d2>2d1+6mm.

[0013] The distance between the cut surface of the glued prism after cutting and the surface opposite to the cut surface is not less than d1+1mm.

[0014] Before the light splitting film is coated on the inclined surface of one of the right-angle prisms, the non-triangle surfaces of the two right-angle prisms are milled and polished.

[0015] The gluing is performed by optical epoxy glue.

[0016] The above structure of the present application can achieve the following beneficial effects: The light splitting lens is formed by two half lenses, when used, part of the light partially transmits through the light splitting lens, and part of the light is reflected through the sixth surface, so that the imaging system has the functions of imaging and light splitting, and the imaging system does not need to be additionally provided with a light splitting prism, thereby reducing the volume and weight of the product, and optimizing the performance of the product. The two same right-angle prisms are glued, then cutting processing is carried out, then the first spherical surface and the second spherical surface are processed, and finally the partial light lens is processed, so that the processing flow is relatively simple, the size is easy to control, the two prism glued surfaces of the finished product partial light lens are connected without error seam, the spherical surfaces of the partial light upper lens and the partial light lower lens are ensured on the same spherical surface, and thus the imaging quality of the lens is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the present application; Figure 2 is a structural schematic view of the present application from another perspective; Figure 3 is a structural schematic view of the present application after the two right-angle prisms are glued during processing; Figure 4 is a structural schematic view of the present application of the carrier after the two right-angle prisms are glued during processing; Figure 5 is a structural schematic view of the present application of the glued prism during processing.

[0018] In the figure: 1, partial light upper lens; 11, first surface; 12, second surface; 13, third surface; 14, fourth surface; 2, partial light lower lens; 21, fifth surface; 22, sixth surface; 23, seventh surface; 24, eighth surface; 3, right-angle prism. DETAILED DESCRIPTION

[0019] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0020] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion, for example, a process, method, device, product or equipment containing a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0021] The following will be described in combination with the drawings Figures 1-5 The present application will be further described in detail.

[0022] Embodiment one, reference Figure 1 and Figure 2The illustrated split light lens comprises: a lens, a first spherical surface and a second spherical surface are oppositely arranged on the lens, and the lens is composed of a split upper lens 1, a split lower lens 2 and a split film; The outer surface of the split upper lens 1 comprises a first surface 11, a second surface 12 and a third surface 13, the first surface 11 and the third surface 13 are respectively arranged on both sides of the second surface 12, and the second surface 12 is a plane; The outer surface of the split lower lens 2 comprises a fifth surface 21, a sixth surface 22 and a seventh surface 23, the fifth surface 21 and the seventh surface 23 are respectively arranged on both sides of the sixth surface 22, and the sixth surface 22 is a plane; The first surface 11 and the fifth surface 21 form a first spherical surface, the third surface 13 and the seventh surface 23 form a second spherical surface, the split film is arranged on the sixth surface 22, the second surface 12 and the sixth surface 22 are oppositely arranged, specifically: the second surface 12 and the sixth surface 22 are glued by optical epoxy glue (the split film is located between the second surface 12 and the sixth surface 22); The second surface 12 and the sixth surface 22 form an angle with the axis of the lens, the angle between the second surface 12 and the axis of the lens is equal to the angle between the sixth surface 22 and the axis of the lens, and the axis of the lens does not pass through the split upper lens 1, and the second surface 12 faces one side of the axis of the lens.

[0023] In this way, the split light lens is formed by two half lenses (the split upper lens 1 and the split lower lens 2), and when in use, part of the light partially transmits through the split light lens, and part of the light is reflected through the sixth surface 22, thereby having the functions of imaging and splitting, so that the imaging system does not need to additionally set a split prism, thereby reducing the volume and weight of the product, and facilitating the performance optimization of the product.

[0024] As Figure 1 shown, in the embodiment, the second surface 12 and the sixth surface 22 do not intersect with the axis of the lens, so as to ensure the realization of the functions of imaging and splitting.

[0025] Further optimization is that a circular side surface is arranged between the first spherical surface and the second spherical surface, the outer surface of the split upper lens 1 further comprises a fourth surface 14, the outer surface of the split lower lens 2 further comprises an eighth surface 24, the two sides of the fourth surface 14 are respectively connected to the two sides of the eighth surface 24, and the fourth surface 14 and the eighth surface 24 form a circular side surface, which has the advantage that the lens imaging of the circular side surface is more uniform, and the edge aberration is smaller.

[0026] In addition to the first embodiment, the present application also includes a second embodiment, an imaging system comprising the split light lens of the first embodiment.

[0027] In addition, the present application also includes a third embodiment, a processing method of a split light lens, used for processing the split light lens of the first embodiment, comprising: two right-angle prisms 3; The method comprises: coating a light splitting film on the inclined surface of one of the right-angle prisms 3; As shown in Figure 3 , the inclined surfaces of the two right-angle prisms 3 are directly opposite and are glued together by optical epoxy glue to form a raw material in the shape of a cuboid (since the raw material is composed of two right-angle prisms 3, the raw material is in the shape of a cube); As shown in Figure 4 and Figure 5 , the raw material is cut from the side of the triangle of the right-angle prism 3 to divide the raw material into two glued prisms in the shape of a cuboid; the cut surface of the glued prism is ground in the circumferential direction to form a circular side surface (i.e., the first spherical surface and the second spherical surface of the glued prism are milled in the circumferential direction to form a circular side surface); the cut surface of the glued prism is milled according to the spherical curvature to form a first spherical surface, and the surface of the glued prism opposite to the first spherical surface is milled according to the spherical curvature to form a second spherical surface; finally, the glued prism is precisely ground and polished to form a light splitting lens.

[0028] According to the central thickness dimension of the light splitting lens, the length dimension of the right-angle side of the light splitting lens converted into the right-angle prism 3 is calculated. The central thickness of the light splitting lens is d1, the length of the right-angle side of the right-angle prism 3 is d2, and d1 and d2 satisfy: d2>2d1+6mm, 2 times d1 is to ensure that the two glued prisms after cutting can be processed into two light splitting lenses, and the material is not wasted; and 6mm is to ensure the cutting of the light splitting prism and the processing allowance of the lens in the later stage.

[0029] The distance between the cut surface of the glued prism after cutting and the surface opposite to the cut surface is not less than d1+1mm, and the design of 1mm is to reserve the allowance for the processing of the lens spherical surface in the later stage.

[0030] Before coating the light splitting film on the inclined surface of one of the right-angle prisms 3, the non-triangle surfaces on the two right-angle prisms 3 are milled and polished.

[0031] Two identical right-angle prisms 3 are glued, then cut and processed, and then the first spherical surface and the second spherical surface are processed, and finally the light splitting lens is processed, and this processing method has a relatively simple processing flow, the size is easy to control, the joint of the glued surfaces of the two prisms of the finished light splitting lens is free of errors, the spherical surfaces of the light splitting upper lens 1 and the light splitting lower lens 2 are on the same spherical surface, thereby ensuring the imaging quality of the lens.

[0032] The above are only preferred embodiments of the present application, the present application is not limited to the above examples. It can be understood that other improvements and changes directly derived or thought by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A beam-splitting lens, characterized in that, The lens comprises a first spherical surface and a second spherical surface arranged oppositely, and is composed of a light-splitting upper lens (1), a light-splitting lower lens (2) and a light-splitting film. The outer surface of the light-splitting upper lens (1) comprises a first surface (11), a second surface (12) and a third surface (13), the first surface (11) and the third surface (13) are arranged on the two sides of the second surface (12) respectively, and the second surface (12) is a plane. The outer surface of the light-splitting lower lens (2) comprises a fifth surface (21), a sixth surface (22) and a seventh surface (23), the fifth surface (21) and the seventh surface (23) are arranged on the two sides of the sixth surface (22) respectively, and the sixth surface (22) is a plane. The first surface (11) and the fifth surface (21) form the first spherical surface, the third surface (13) and the seventh surface (23) form the second spherical surface, the light-splitting film is arranged on the sixth surface (22), and the second surface (12) and the sixth surface (22) are arranged oppositely. The second surface (12) and the sixth surface (22) form an angle with the axis of the lens, and the angle between the second surface (12) and the axis of the lens is equal to the angle between the sixth surface (22) and the axis of the lens. The second surface (12) and the sixth surface (22) do not intersect with the axis of the lens.

2. The spectrophotometric lens of claim 1, wherein: The first spherical surface and the second spherical surface are arranged with a circular side surface therebetween, the outer surface of the light-splitting upper lens (1) further comprises a fourth surface (14), the outer surface of the light-splitting lower lens (2) further comprises an eighth surface (24), the two sides of the fourth surface (14) are connected with the two sides of the eighth surface (24) respectively, and the fourth surface (14) and the eighth surface (24) form the circular side surface.

3. The spectrophotometer lens of claim 1, wherein: The second surface (12) and the sixth surface (22) are glued by optical epoxy glue.

4. The spectrophotometric lens of claim 1, wherein: The light-splitting lens comprises:

5. An imaging system characterized by, The light-splitting lens according to any one of claims 1-4. The light-splitting lens comprises:

6. A method for processing a light-splitting lens, for processing the light-splitting lens according to any one of claims 1 to 4, characterized by, Two right-angle prisms (3). The method comprises: Coating a light-splitting film on the inclined surface of one of the right-angle prisms (3); Opposing the inclined surfaces of the two right-angle prisms (3) and gluing them to form a raw material in the shape of a cuboid; Cutting the raw material from one side of the triangle of the right-angle prism (3) to divide the raw material into two glued prisms in the shape of a cuboid; Grinding the outer circle of the cut surface of the glued prism in the circumferential direction to form a circular side surface; Milling and grinding the cut surface of the glued prism according to the spherical curvature to form the first spherical surface, and milling and grinding the surface of the glued prism opposite to the first spherical surface according to the spherical curvature to form the second spherical surface; Finally, polishing the glued prism to form the light-splitting lens. The central thickness of the light-splitting lens is d1, the side length of the right-angle prism (3) is d2, and the d1 and the d2 satisfy: d2>2d1+6mm.

7. The method of claim 6, wherein: The distance between the cut surface of the cut glued prism and the surface opposite to the cut surface is not less than d1+1mm.

8. The method of claim 7, wherein: ​ 9. The method of claim 6, wherein: The non-triangle faces of the two right-angle prisms (3) are milled and polished before the inclined plane of one of the right-angle prisms (3) is coated with a light splitting film.

10. The method of claim 6, wherein: The gluing is performed by optical epoxy glue.

Images