TWI698670B - Coupling lens - Google Patents

Abstract

A coupling lens has a main body, a light incidence lens portion, and a light emergence lens portion. A light incidence surface and a light emergence surface are arranged apart from each other on the main body, four side surfaces surround between the light incidence surface and the light emergence surface. At least one installing surface is formed on one side surface. A length on the installing surface extending to two of the adjacent side surfaces is defined as an installing surface length. The light incidence lens portion and the light emergence lens portion are respectively mounted on the light incidence surface and the light emergence surface. The light incidence lens portion comprises a light incidence arc surface, a radial length of the light incidence arc surface is defined as a light incidence optical diameter. The light emergence lens portion comprises a light emergence arc surface, a radial length of the light emergence arc surface is defined as a light emergence optical diameter. Because the light incidence optical diameter is longer than the light emergence optical diameter, and the installing surface length is longer than the light emergence optical diameter, the coupling lens can be stably mounted.

Description

Coupling lens

This creation relates to a coupling lens made of glass, especially a coupling lens used to make light transmission modules.

During the production process of the optical transmission module, a light-emitting diode or a laser diode is needed to introduce light energy into the glass fiber. For the detailed production process, please refer to Japanese patents JP2018-66771 and JP2018-72499; In other words, in this process, an optical fiber and a light-emitting source (laser light or light-emitting diode) are respectively placed on two processing bases, and a lens is further placed between the two, and the lens faces the light-emitting source and The two sides of the optical fiber are two convex curved surfaces with different curvatures. Therefore, when the pulsed light is emitted from the light source and passes through the lens, the originally more divergent light path will shrink inward due to refraction, and when the light is emitted from the other side of the lens At this time, the curved surface of the side surface can further converge the light into the optical fiber to complete the process of introducing light energy.

On the other hand, the manufacturing method of this kind of optical fiber lens is briefly described as follows: First, a glass preform is placed between an upper mold core and a lower mold core, and the upper mold core and the lower mold core have two molding surfaces respectively. Concave arc surface, the curvature of the two concave arc surfaces is the mirror reflection of the convex arc surfaces of the opposite sides after the lens is formed; after the glass preform is placed between the upper mold core and the lower mold core, A sleeve is sleeved on the outside, and then the upper mold core and the lower mold core are pressed together, and the squeezed glass preform is deformed and gradually extends toward the outer side of the upper and lower mold cores; Please refer to Figure 9 and Figure 10, when the glass preform extends to the inner wall surface of the sleeve, it will gradually form a flat mounting surface because it abuts against the inner wall surface of the sleeve; however, due to the extension of the glass preform However, after the extrusion of the upper mold core and the lower mold core is completed, the glass preform will not completely adhere to the wall surface of the sleeve. For example, when viewed from above, due to the thickness of the glass itself and the extrusion Strength, the extent that it extends from the middle of the upper mold core and the lower mold core toward the inner wall surface of the sleeve does not completely extend to the four corners of the inner wall surface of the sleeve, so the final processed glass lens 90 is attached to it The part that fits to the inner wall of the sleeve will form a flat mounting surface 93, but two adjacent mounting surfaces 93 will form a round or other chamfer due to the limitation of the extensibility of the glass preform; in other words, The inner diameter of the sleeve, that is, in the finally formed glass lens 90, the distance (W) between the two opposite mounting surfaces 93 will be greater than the mounting surface length (W1) of the mounting surface 93 in the same direction. .

Please refer to Figures 10 and 11. More precisely, the processed lens 90 has two opposite sides, respectively, a light-incident surface 91 (commonly referred to as "A side") and a light-emitting surface 92 (commonly referred to as "B side"). "), the light incident surface 91 and the light output surface 92 are respectively formed with arc-shaped light incident lens portion 94 and light output lens portion 95. The light incident lens portion 94 has a light incident circular arc surface, and the light incident circular arc surface It has an incident optical path D1 (i.e. its radial length), and the light output lens portion 95 has a light output arc surface. The light output arc surface has a light output optical path D2 (i.e. its radial length). In the prior art, The light incident optical path D1 is smaller than the light output optical path D2, and the installation surface length (W1) of the mounting surface 93 is also smaller than the light output optical path D2.

However, the prior art lens for making optical fibers has the following shortcomings during its production and use.

First, please refer to Figures 10 and 11. As the lens 90 is placed on the platform 81 between the light source 82 and the optical fiber 83 through the flat mounting surface 93 when in use, the size of the mounting surface 93 is determined The lens 90 is placed on the platform 81 stably. However, in the prior art, due to the limitation of the processing machine and parameters, the mounting surface length (W1) of the mounting surface 93 is longer than the distance between the two opposite mounting surfaces 93. The ratio (W1/W) can only be maintained between 0.5 and 0.8, in other words, the mounting surface 93 The inability to increase the length of the mounting surface (W1) effectively means that the area of the mounting surface 93 itself cannot be effectively increased. Therefore, when the lens 90 of the prior art is placed on the platform 81, its stability is relatively insufficient;

Second, the processing result of the prior art makes the light incident optical path D1 of the light incident surface 91 smaller than the light output optical path D2 of the light output surface 92. The preset condition of this feature is that the distance between the light incident surface 91 and the light source 82 is very long. However, the small area of the light incident surface 91 may still fail to effectively absorb light under different conditions. At the same time, the small area makes the user install the lens 90 with low error tolerance in the installation position, in other words If the user accidentally changes the position of the lens 90 in the installation, the lens 90 will easily fail to introduce most of the light and cannot be used correctly. That is, the lens 90 in the prior art must be very carefully avoided during installation. Its location is misplaced, thereby increasing the overall installation time.

Third, when the prior art lens 90 is in use, in addition to the aforementioned ratio (W1/W) which will affect the stability of installation and use, the installation surface length (W1) is smaller than the light exit optical path D2 of the light exit surface 92. It will also affect its overall stability.

In summary, since the production of optical fibers is a process requiring extremely high precision, the prior art design that is prone to shaking and causing installation deviation has its drawbacks.

In view of the shortcomings and deficiencies of the prior art, this creation provides a coupling lens, which re-improves the structural design of the glass lens, so that it can improve stability and reduce possible installation errors.

In order to achieve the above-mentioned creative purpose, the technical means used in this creation is a coupling lens, which includes a lens body on which a light-incident surface, a light-emitting surface, four sides, and at least one mounting surface are formed. The surface and the light-emitting surface are the opposite sides of the lens body, the four side surfaces are arranged around, and any two adjacent side surfaces are perpendicular to each other, and each side surface connects the light-incident surface and the circumference of the light-emitting surface Each of the at least one mounting surface is arranged on one of the side surfaces and extends toward two adjacent side surfaces, and the length of each at least one mounting surface extending toward two adjacent side surfaces is defined as a mounting surface length; , The connecting line between the light incident surface and the light exit surface is defined as an optical axis; the distance between the side of each of the at least one mounting surface adjacent to the light incident surface and the light incident surface along the optical axis is defined as A light-incoming distance; the distance along the optical axis between a side of each of the at least one mounting surface adjacent to the light-emitting surface and the light-emitting surface is defined as a light-outgoing distance; the light-incoming distance is greater than or equal to the light-outgoing distance; A light incident lens portion protruding from the light incident surface of the lens body, and the light incident lens portion has a light incident arc surface, and the radial length of the light incident arc surface is defined as a light incident optics A light-emitting lens portion, which protrudes from the light-emitting surface of the lens body, and the light-emitting lens portion has a light-emitting arc surface, and the radial length of the light-emitting arc surface is defined as a light-emitting optical path; The light incident optical path is greater than the light output optical path, and the length of the mounting surface of each of the at least one mounting surface is also greater than the light output optical path.

This creation further designs a coupling lens, which includes a lens body on which a light incident surface, a light exit surface, four sides, and at least one mounting surface are formed. The light incident surface and the light exit surface are respectively the parts of the lens body. Opposite two sides, the four side surfaces are arranged around, and any two adjacent side surfaces are perpendicular to each other, each side surface is connected to the periphery of the light incident surface and the light exit surface, and each of the at least one mounting surface is arranged on one of the side surfaces, and Extending toward two adjacent side surfaces, and the length of each of the at least one mounting surface extending toward two adjacent side surfaces is defined as a mounting surface length; wherein, the connecting line between the light incident surface and the light emitting surface is defined as an optical axis ; Each of the at least one mounting surface is adjacent to the light incident surface and the distance along the optical axis between the light incident surface is defined as a light incident distance; each of the at least one mounting surface is adjacent to the light emitting surface The distance along the optical axis between one side of the lens and the light exit surface is defined as a light exit distance; the light entrance distance is less than or equal to the light exit distance; a light entrance lens portion protruding from the light entrance surface of the lens body Above, and the light incident lens portion has a light incident arc surface, and the radial length of the light incident arc surface is defined as a light incident optical path; A light-emitting lens portion protruding from the light-emitting surface of the lens body, and the light-emitting lens portion has a light-emitting arc surface, and the radial length of the light-emitting arc surface is defined as a light-emitting optical path; wherein, the incident light The optical path is greater than the light-emitting optical path, and the length of the mounting surface of each of the at least one mounting surface is also greater than the light-emitting optical path.

The advantage of this creation is that since the incident optical path is larger than the exit optical path (and the size of the exit optical path remains the size of the prior art), when this creation is installed and used, the incident lens portion facing the light source has a relatively large Large light receiving area, so when the user installs the book creation, it is less likely to happen because the installation position is wrong, and most of the light cannot be introduced into the optical fiber; on the contrary, a larger area of light incident The lens part allows users to complete the installation of the creation more quickly without worrying about installation errors, so it can improve the installation efficiency of the creation; on the other hand, the creation design makes the installation surface longer than the optical path of the light. Length, thereby expanding the overall area of the installation surface, and further improving the stability of the creation after installation.

Furthermore, in the aforementioned coupling lens, the ratio of the length of the mounting surface of each of the at least one mounting surface to the distance between the two opposite side surfaces is more than 80%.

Furthermore, in the aforementioned coupling lens, the ratio of the length of the mounting surface of each of the at least one mounting surface to the distance between the two opposite side surfaces is between 85% and 95%.

Furthermore, in the aforementioned coupling lens, an arc chamfer is further formed between any two adjacent side surfaces.

Furthermore, in the aforementioned coupling lens, the ratio of the light incident optical path to the light output optical path is between 1.0 and 1.6.

Furthermore, in the aforementioned coupling lens, the ratio of the length of the mounting surface to the optical path of the light exit is between 1.1 and 2.0.

Furthermore, in the aforementioned coupling lens, the length from one side of each of the at least one mounting surface adjacent to the light incident surface to the side of the mounting surface adjacent to the light emitting surface is defined as a mounting surface Width; the distance between the light incident surface and the light exit surface of the lens body is defined as a body width; wherein the ratio of the mounting surface width to the body width is between 0.85 and 1.0.

10: Lens body

11: Glossy surface

12: Glossy surface

13: side

131: arc chamfer

14: Mounting surface

20: entrance lens

21: Light-incident arc surface

30: Light emitting lens part

31: Light emitting arc surface

70: glass preform

81: platform

82: Luminous Source

83: Fiber

84: upper mold

85: lower mold core

86: concave arc

87: sleeve

88: Adhesive

90: lens

91: Glossy surface

92: Glossy Surface

93: mounting surface

94: incident lens

95: Light emitting lens part

D1: incident optical path

D2: Optical path

L: Optical axis

W: separation distance

W1: Length of mounting surface

W2: mounting surface width

W3: incident light pitch

W4: light spacing

W5: body width

Figure 1 is the three-dimensional appearance of this creation.

Figure 2 is a top view of this creation.

Figure 3 is a front plan view of this creation after being installed on a base.

Figure 4 is a diagram of this creation, a light source and an optical fiber in use.

Figure 5 is a top view of Figure 4.

Figure 6 to Figure 8 are the manufacturing flow chart of this creation.

Figure 9 is a rear view of a prior art coupling lens.

Figure 10 is a bottom view of Figure 9.

Figure 11 is a top view of a prior art coupling lens in use.

In the following, in conjunction with the drawings and preferred embodiments of this creation, the technical means adopted by this creation to achieve the predetermined creation purpose are further described.

Please refer to FIG. 1 and FIG. 2, the coupling lens of the present invention includes a lens body 10, a light-incident lens part 20 and a light-exit lens part 30.

Please refer to Figures 1, 2 and 3, the lens body 10 is formed with a light entrance surface 11, a light exit surface 12, four side surfaces 13, and at least one mounting surface 14. The light entrance surface 11 and the light exit surface 12 are respectively the lens On two opposite sides of the main body 10, the four side surfaces 13 are arranged around each other, and any two adjacent side surfaces 13 are perpendicular to each other, and each side surface 13 is connected to the periphery of the light entrance surface 11 and the light exit surface 12. More precisely, this embodiment Wherein, the lens body 10 is a rectangular body, and the light entrance surface 11 and the light exit surface 12 are respectively two relatively large surface areas. The four side surfaces 13 are arranged around the two surfaces 11 and 12, but the shape is not limited to this. The lens body 10 may also have a shape other than a rectangular body. For example, in other embodiments, the lens body 10 may It is an octagonal column.

Please refer to FIG. 1 and FIG. 2. Further, in this embodiment, an arc chamfer 131 is further formed between any two adjacent side surfaces 13, but it is not limited to this. Two adjacent side surfaces 13 A non-circular chamfer can also be formed between them. For example, when any two adjacent side surfaces 13 are connected in a straight line, the lens body 10 of the present invention is an octagonal column.

Please refer to FIG. 2 and FIG. 3. In this embodiment, the number of the at least one mounting surface 14 is four, that is, the number of the mounting surface 14 corresponds to the number of the side surface 13, but it is not limited thereto, and it is also It can be other numbers; the four mounting surfaces 14 are respectively disposed on the four side surfaces 13, and each of the mounting surfaces 14 respectively extends toward two adjacent side surfaces 13, and the length of the mounting surface 14 toward the adjacent two side surfaces 13 defines Is a mounting surface length W1. In addition, the separation distance between two opposite side surfaces 13 is defined as the separation distance W, and in this embodiment, the ratio of the mounting surface length W1 to the separation distance W (W1/W) is 80% or more (Including 80%), and in a preferred embodiment, the ratio (W1/W) is between 85% and 95%. For example, in the preferred embodiment of the present invention, the separation distance W is 1mm , And the mounting surface length W1 can be 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1.0mm.

The light incident lens portion 20 protrudes from the light incident surface 11 of the lens body 10, and the light incident lens portion 20 has a light incident arc surface 21, and the radial length of the light incident arc surface 21 is defined as a light incident optical path D1.

The light-emitting lens portion 30 protrudes from the light-emitting surface 12 of the lens body 10, and the light-emitting lens portion 30 has a light-emitting arc surface 31. The radial length of the light-emitting arc surface 31 is defined as a light-emitting optical path D2.

2 and 3, in this embodiment, the light incident optical path D1 is greater than the light output optical path D2, and the mounting surface length W1 of each mounting surface 14 is also greater than the light output optical path D2. In a preferred embodiment, the ratio (D1/D2) of the incident optical path D1 to the outgoing optical path D2 is between 1.0 and 1.6. For example, in the preferred embodiment of the present invention, the incident optical path D1 can be 0.65mm, 0.7mm, 0.75mm or 0.8mm, and the corresponding light exit optical diameter D2 is 0.5mm, 0.55mm, 0.6mm or 0.65mm.

On the other hand, in this embodiment, the mounting surface length W1 of each mounting surface 14 is also greater than the length of the light-emitting optical path D2. More precisely, the length W1 of the mounting surface of each mounting surface 14 and the light-emitting optical path D2 of the present invention are The ratio (W1/D2) is between 1.1 and 2.0. For example, in the preferred embodiment of the invention, the length of the mounting surface W1 can be 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, and the corresponding The light output optical diameter D2 is 0.5mm, 0.55mm, 0.6mm, 0.65mm or 0.7mm.

In other embodiments, the light entrance lens portion 20 and the light exit lens portion 30 can be a convex surface, a flat surface or a concave surface, respectively, which can be adjusted according to the needs of the user. The shape of the light entrance lens portion 20 and the light exit lens portion 30 Not limited to the above.

Please further refer to Figures 4 and 5. In this creation, the connection between the light incident surface 11 and the light exit surface 12 is defined as an optical axis L, and each mounting surface 14 is adjacent to one side of the light incident surface 11 The distance between the edge and the light incident surface 11 along the optical axis L is defined as a light incident distance W3, and the distance between the side of each mounting surface 14 adjacent to the light output surface 12 and the light output surface 12 along the optical axis L is defined It is a light-emitting pitch W4. In this embodiment, the light-incident pitch W3 is greater than the light-emitting pitch W4, but it is not limited to this. In other embodiments, the light-incident pitch W3 may be equal to or smaller than the light-emitting pitch W4. Because this adjustment of the size relationship between the light-incident distance W3 and the light-exit distance W4 involves the user's gravity balance of the creation, and the different functions of the light incident surface 11 and the light output surface 12 in distinguishing.

Please further refer to Figure 2. More precisely, this creation further includes a mounting surface width W2 and a body width W5. The mounting surface width W2 is defined as the side edge of each mounting surface 14 adjacent to the light incident surface 11. As for the length of one side adjacent to the light-emitting surface 12, to be more precise, the length in this embodiment is the width of the mounting surface 14 in the extending direction of the optical axis L; on the other hand, the definition of the body width W5 Is the distance between the light entrance surface 11 and the light exit surface 12 on the lens body 10, more precisely, it is the distance between the light entrance surface 11 and the light exit surface 12 along the extension direction of the optical axis L; in the preferred embodiment In the width of the mounting surface The ratio of W2 to the body width W5 (W2/W5) is between 0.85 and 1.0. For example, the mounting surface width W2 can be 0.39mm, 0.42mm, or 0.46mm, and the body width is 0.46mm.

The following is the production process, usage status and advantages of this creation.

Please refer to Figures 3 and 6, the production process of this creation is as follows: First, the user places a glass preform 70 between an upper mold core 84 and a lower mold core 85, an upper mold core 84 and a lower mold core The inner side of 85 has a concave arc surface 86 respectively. The curvature of the two concave arc surfaces 86 is the projection of the light incident lens portion 20 and the light output lens portion 30 on the light incident surface 11 and the light exit surface 12 after the lens body 10 is formed. The two arc surfaces 21 and 31, in other words, the contours of the concave arc surface 86 of the upper mold core 84 and the lower mold core 85 correspond to the contours of the light incident circular arc surface 21 and the light exit circular arc surface 31, respectively.

6 and 7, after the glass preform 70 is placed between the upper mold core 84 and the lower mold core 85, a sleeve 87 is sleeved on the outer side of the upper and lower mold cores 84, 85, and then the upper mold The core 84 and the lower mold core 85 are pressed together, and the squeezed glass preform 70 will be deformed and gradually extend toward the outside of the upper and lower mold cores 84 and 85.

Please refer to Figures 6 and 8, when the glass preform 70 extends to the inner wall surface of the sleeve 87, because it abuts against the inner wall surface of the sleeve 87, a flat mounting surface 14 is gradually formed, which is affected by the upper and lower molds. The two sides of the cores 84 and 85 pressed together form the light-incident surface 11 and the light-emitting surface 12, and the surfaces formed with the mounting surface 14 and opposed to the inner wall surface of the sleeve 87 become the four side surfaces 13 of the lens body 10. .

The following is the usage status of the creation: Please refer to Figure 2, Figure 3 and Figure 4. When this creation is used, the creation is placed on the platform 81 with one of the mounting surfaces 14 as the bottom surface. Both ends are respectively provided with a light source 82 (laser light in this embodiment) and an optical fiber 83. After they are placed on the platform 81, the user can fill the gap between the arc chamfer 131 and the platform 81 with adhesive 88. The adhesive 88 can further strengthen the mounting stability of the lens body 10, but it is an unnecessary element.

Please further refer to Figures 4 and 5, after the installation is completed, the user turns on the light source 82, the light is emitted from the light source 82 toward the lens body 10, and when passing through the light incident surface 11, because of the incident light The light incident arc surface 21 of the lens portion 20 performs the first refraction, and when passing to the light exit surface 12, it passes through the light exit arc surface 31 of the light exit lens portion 30 for the second refraction, and the light passes through the second refraction After that, it can be folded and introduced into the optical fiber 83 placed at the light exit surface 12 to complete the processing of the optical fiber in this part.

The following are the advantages of this creation.

First, please refer to Figures 2 and 5. This creation is designed to design the incident optical path D1 to be larger than the exit optical path D2. Therefore, when the creation is placed on the platform 81, the large area of the incident lens portion 20 It can condense a larger range of light. In other words, when the user arranges the creative position, even if the arrangement position is slightly shifted left and right, the light incident lens part 20 can still gather more light, thus improving the creative installation. Set the fault tolerance rate.

Second, please refer to Figures 2 and 3. This creation extends the installation surface length W1 of the installation surface 14 to be greater than the light exit optical path D2 of the light exit arc surface 31. This ratio enables the lens body 10 to be placed on When the platform 81 is on, stand relatively firmly, which achieves the advantage of improving the stability when placed.

Thirdly, please refer to FIGS. 4 and 5. In this embodiment, the light incident distance W3 is greater than the light output distance W4. This design makes the mounting surface 14 closer to the light emitting arc surface 31 with a small area, more precisely In the direction of the optical axis L, the distance between the center of the mounting surface 14 and the light-emitting lens portion 30 is smaller than the distance between the center of the mounting surface 14 and the light-incident lens portion 20. This design makes the light-emitting lens portion 30 lighter than the light The heavy light-incident lens part 20 achieves a balance of leverage, thereby improving the stability of the creative installation.

The above description is only the preferred embodiment of this creation, and does not impose any formal restriction on this creation. Although this creation has been disclosed as above in preferred embodiments, it is not intended to limit this creation. Any technical field has Generally knowledgeable persons, without departing from the scope of this creative technical solution, can use the above-disclosed technical content to make some changes or modifications as the equivalent of equivalent changes. However, any content that does not deviate from this creative technical solution shall be based on The technical essence of this creation is Any simple modifications, equivalent changes and modifications made by the embodiments still fall within the scope of the technical solution for creation.

10: Lens body

11: Glossy surface

13: side

131: arc chamfer

14: Mounting surface

21: Light-incident arc surface

Claims (8)

A coupling lens comprising a lens body on which a light entrance surface, a light exit surface, four side surfaces and at least one mounting surface are formed. The light entrance surface and the light exit surface are two opposite sides of the lens body, respectively. Four side surfaces are arranged around, and any two adjacent side surfaces are perpendicular to each other. Each side surface connects the periphery of the light incident surface and the light exit surface, and each of the at least one mounting surface is arranged on one of the side surfaces and faces the adjacent The two side surfaces extend, and the length of each of the at least one mounting surface extending toward the adjacent two side surfaces is defined as a mounting surface length; wherein the connecting line between the light incident surface and the light exit surface is defined as an optical axis; The distance between a side of a mounting surface adjacent to the light-incident surface and the light-incident surface along the optical axis is defined as a light-incident interval; each of the at least one mounting surface is adjacent to a side of the light-emitting surface The distance from the light exit surface along the optical axis is defined as a light exit distance; the light entrance distance is greater than or equal to the light exit distance; a light entrance lens portion protruding from the light entrance surface of the lens body, and The light incident lens portion has a light incident arc surface, and the radial length of the light incident arc surface is defined as a light incident optical path; a light output lens portion protruding from the light exit surface of the lens body, and The light output lens portion has a light output arc surface, and the radial length of the light output arc surface is defined as a light output optical path; wherein, the light input optical path is larger than the light output optical path, and each of the at least one mounting surface is the mounting surface The length is also greater than the light exit optical path. The coupling lens according to claim 1, wherein the ratio of the length of the mounting surface of each of the at least one mounting surface to the distance between the two opposite side surfaces is 80% or more. The coupling lens according to claim 2, wherein the ratio of the length of the installation surface of each of the at least one installation surface to the distance between the two opposite side surfaces is between 85% and 95%. The coupling lens according to any one of claims 1 to 3, wherein an arc chamfer is further formed between any two adjacent side surfaces. The coupling lens according to any one of claims 1 to 3, wherein the ratio of the light incident optical path to the light output optical path is between 1.0 and 1.6. The coupling lens according to any one of claims 1 to 3, wherein the ratio of the length of the mounting surface to the optical path of the light exit is between 1.1 and 2.0. The coupling lens according to any one of claims 1 to 3, wherein the length from one side of each of the at least one mounting surface adjacent to the light incident surface to the side of the mounting surface adjacent to the light emitting surface It is defined as a mounting surface width; the distance between the light incident surface and the light exit surface of the lens body is defined as a body width; wherein the ratio of the mounting surface width to the body width is between 0.85 and 1.0. A coupling lens comprising a lens body on which a light entrance surface, a light exit surface, four side surfaces and at least one mounting surface are formed. The light entrance surface and the light exit surface are two opposite sides of the lens body, respectively. Four side surfaces are arranged around, and any two adjacent side surfaces are perpendicular to each other. Each side surface connects the periphery of the light incident surface and the light exit surface. Each of the at least one mounting surface is arranged on one of the side surfaces and faces the adjacent The two side surfaces extend, and the length of each of the at least one mounting surface extending toward the adjacent two side surfaces is defined as a mounting surface length; wherein the connecting line between the light incident surface and the light exit surface is defined as an optical axis; The distance between a side of a mounting surface adjacent to the light-incident surface and the light-incident surface along the optical axis is defined as a light-incident interval; each of the at least one mounting surface is adjacent to a side of the light-emitting surface The distance from the light exit surface along the optical axis is defined as a light exit distance; the light entrance distance is less than or equal to the light exit distance; a light entrance lens portion protruding from the light entrance surface of the lens body, and The light entrance lens portion has a light entrance arc surface, and the radial length of the light entrance arc surface is defined as a light entrance optical path; a light exit lens portion protruding from the light exit surface of the lens body, and the The light exit lens portion has a light exit arc surface, and the radial length of the light exit arc surface is defined as a light exit optical path; Wherein, the light incident optical path is greater than the light output optical path, and the length of the mounting surface of each of the at least one mounting surface is also greater than the light output optical path.

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