TWM632524U - Wireless communication equipment, electromagnetic lens assembly and lens - Google Patents

Abstract

A wireless communication device, comprising a casing, an antenna and an electromagnetic lens assembly, wherein the casing has a wireless signal penetration area, and the antenna transmits wireless signals through the wireless signal penetration area; the electromagnetic lens assembly includes a lens barrel and a lens, the lens barrel has a first end and a second end, the first end is closer to the wireless signal penetration area than the second end; the lens is arranged in the lens barrel, and the lens has an incident surface and an emission surface in the direction of its main axis Surface, wherein, the incident surface of the lens is a plane, and the incident surface faces the first end; the outgoing surface is a convex surface, and the outgoing surface has a curvature on a first axis perpendicular to the main axis and is perpendicular to a first axis perpendicular to the main axis and the first axis. The upward curvature of the two axes is 0.

Description

Wireless communication equipment, electromagnetic lens assembly and lens

This creation is related to wireless communication; in particular, it refers to a wireless communication device, an electromagnetic lens assembly and a lens.

With the vigorous development of wireless communication, such as wireless local area network or mobile communication products, the demand for bandwidth and data transmission rate of wireless signals is also increasing day by day. Therefore, how to provide antenna modules with high gain and high transmission efficiency of wireless signals Group is one of the directions of striving for R & D and innovation.

The general wireless signal access device (Accesses point) is used as the transmission of the wireless signal of the wireless network, and the coverage of the wireless signal sent by it is usually relatively wide. However, in a specific use case, it is necessary to concentrate the wireless signal in a specific direction, therefore, the general wireless signal access device is not applicable. A wireless signal access device with an electromagnetic lens is required to concentrate the wireless signal in a specific direction.

The wireless signal access device with the electromagnetic lens is to embed the electromagnetic lens in the casing of the wireless signal access device, and the structure of the casing is different from the casing of the general wireless signal access device. For the manufacturer of the wireless signal access device, it is necessary to have two kinds of casings, one is for the general wireless signal access device, and the other is for the wireless signal access device with electromagnetic lens. As a result, it will cause pressure and cost on chassis inventory.

In view of this, the purpose of this invention is to provide a wireless communication device, an electromagnetic lens assembly and a lens, so as to reduce the manufacturer's inventory pressure and cost for the casing.

In order to achieve the above purpose, this invention provides a wireless communication device, including: a casing, an antenna and an electromagnetic lens assembly, wherein the casing has a wireless signal penetration area, the antenna is located in the casing and corresponds to the wireless The signal transmission area, the antenna transmits wireless signals through the wireless signal penetration area; the electromagnetic lens assembly includes a lens barrel and a lens, and the lens barrel has a first end and a second end opposite to each other in its axial direction, and the first end The second end is closer to the wireless signal penetration area; the lens is arranged in the lens barrel and is used for converging electromagnetic waves. The lens has an incident surface and an exit surface in the direction of its main axis, wherein the incident surface of the lens is a plane, and the incident surface faces the first One end; the exit surface is convex, and the exit surface has a curvature on a first axis perpendicular to the main axis and a curvature of 0 on a second axis perpendicular to the main axis and the first axis; wherein, the exit surface is perpendicular to the main axis The radius of one projected circle is R; the radius of curvature of the exit surface on the first axis is Rc; the distance from the incident surface to the antenna on the main axis is D; it satisfies: 0.50≦R/Rc≦0.6; 0.4≦R/ D≦0.5.

An electromagnetic lens assembly provided by the invention includes a lens barrel and a lens, wherein the lens barrel has a first end and a second end opposite to each other in its axial direction; the lens is arranged in the lens barrel and is used for converging electromagnetic waves, The lens has an incident surface and an exit surface in the direction of its main axis, wherein the incident surface of the lens is a plane, and the incident surface faces the first end; the exit surface is a convex surface, and the exit surface has a curvature on a first axis perpendicular to the main axis. And the curvature is 0 on a second axis perpendicular to the main axis and the first axis; wherein, the radius of the projected circle of the projected surface perpendicular to the main axis is R; the curvature radius of the projected surface on the first axis is Rc ; It satisfies: 0.50≦R/Rc≦0.6.

The invention provides a lens for converging electromagnetic waves, wherein the lens has an incident surface and an exit surface in the direction of its main axis, the exit surface is convex, and the exit surface is perpendicular to There is curvature on a first axis of the main axis and a curvature of 0 on a second axis perpendicular to the main axis and the first axis; wherein, the incident surface of the lens is a plane; the projection surface of the lens is a circle perpendicular to the main axis The radius of R is R; the radius of curvature of the emitting surface on the first axis is Rc; it satisfies: 0.50≦R/Rc≦0.6.

The effect of this invention is that the electromagnetic lens assembly can directional gain the wireless signal sent by the antenna without increasing the thickness of the casing of the host. After the electromagnetic lens assembly is detached, wireless signals can also be sent and received without passing through the electromagnetic lens, effectively reducing the manufacturer's inventory pressure and cost for the casing.

[this creation]

1: Wireless communication equipment

10: Host

12: Chassis

122: side panel

122a: opening

14: Antenna

16: Electromagnetic lens assembly

18: lens barrel

18a: first end

18b: second end

20: barrel

22: Joint

24: Reinforcing rib

26: first binding end

28: Support rib

30: The first positioning rib

32: sealing ring

34: Protective cover

36: the second binding end

38: pressure rib

40: Second positioning rib

42: lens

44: Flange

442: Gap

46: incident surface

48: Injection surface

50: Guide fillet

2: Wireless communication equipment

52: Host

54: Chassis

542: shell

542a: opening

544: Plane lens

56: Antenna

58: Electromagnetic lens assembly

60: lens barrel

60a: first end

60b: second end

62: junction

64: shoulder

66: Bracket

3 wireless communication equipment

68: lens

70: incident surface

72: Injection surface

74: Flange

76: Antenna

H: Thickness

H1: Thickness

H2: Thickness

i: spindle

R: Radius

Rc: radius of curvature

R1: Radius

S: Bolt

X: the first axis

Y: the second axis

Z: the third axis

FIG. 1 is a perspective view of a wireless communication device in a first preferred embodiment of the present invention.

Fig. 2 is a partially exploded perspective view of the wireless communication device of the first preferred embodiment of the present invention.

Fig. 3 is an exploded perspective view of the electromagnetic lens assembly of the first preferred embodiment of the present invention.

Fig. 4 is an exploded perspective view from another perspective of the electromagnetic lens assembly of the first preferred embodiment of the present invention.

Fig. 5 is a top view of the wireless communication device of the first preferred embodiment of the present invention.

Fig. 6 is a sectional view along line 6-6 of Fig. 5 .

Fig. 7 is a partially cutaway perspective view of the wireless communication device of the first preferred embodiment of the present invention.

FIG. 8 is a partially enlarged view of part A of FIG. 7 .

Fig. 9 is a perspective view of the lens of the first preferred embodiment of the invention.

Fig. 10 is a front view of the lens of the first preferred embodiment of the invention.

Fig. 11 is a side view of the lens of the first preferred embodiment of the present invention.

Fig. 12 is a top view of the lens of the first preferred embodiment of the present invention.

Fig. 13 is a field diagram of the wireless communication device of the first preferred embodiment of the present invention.

Fig. 14 is a field diagram of the wireless communication device in the first preferred embodiment without an electromagnetic lens assembly.

Fig. 15 is a perspective view of a wireless communication device according to a second preferred embodiment of the present invention.

Fig. 16 is a partially exploded perspective view of a wireless communication device according to a second preferred embodiment of the present invention.

Fig. 17 is a top view of a wireless communication device according to a second preferred embodiment of the present invention.

Fig. 18 is a sectional view taken along line 18-18 of Fig. 17 .

Fig. 19 is a front view of the lens of the third preferred embodiment of the present invention.

Fig. 20 is a side view of the lens of the third preferred embodiment of the present invention.

Fig. 21 is a schematic diagram of a wireless communication device according to a third preferred embodiment of the present invention.

FIG. 22 is a field diagram of a wireless communication device in a third preferred embodiment of the present invention.

Fig. 23 is a field diagram of a wireless communication device without an electromagnetic lens assembly in the third preferred embodiment.

In order to illustrate this creation more clearly, a preferred embodiment is given hereby and detailed description is as follows in conjunction with drawings. Please refer to shown in Fig. 1 to Fig. 12, it is the wireless communication equipment 1 of the first preferred embodiment of this invention, it is to take the wireless signal access device (Accesses point) as example, the wireless communication equipment 1 comprises a host computer 10 and a Electromagnetic lens assembly 16. A first axis X, a second axis Y, and a third axis Z perpendicular to each other are defined.

The host 10 is used for transmitting or receiving wireless signals, such as Wi-Fi signals. The host 10 includes a casing 12 and an antenna 14 . The casing 12 is made of plastic, such as Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (Polycarbonate, PC). The side plate 122 of the casing 12 has an opening 122a, the opening 122a constitutes a wireless signal penetration area. The antenna 14 is located in the casing 12 and corresponds to the opening 122a. In this embodiment, the antenna 14 is an array antenna, taking a 3×5 array antenna as an example, but not limited thereto, it can also be 2×4, 4×8, 4 ×4, 8×8 or higher order array antennas. The center of the antenna 14 and the center of the opening 122a are located on the same axis, and the long axis of the antenna 14 extends along the first axis X, and the short axis extends along the second axis Y. The antenna 14 transmits wireless signals through the opening 122a.

The electromagnetic lens assembly 16 is detachably combined with the casing 12 and corresponds to the opening 122a. The electromagnetic lens assembly 16 includes a lens barrel 18 and a lens 42. The axial direction of the lens barrel 18 extends along the third axis Z and the lens barrel 18 has a first end 18a and a second end 18b opposite to each other in the axial direction. , the first end 18a is closer to the opening 122a than the second end 18b. The lens 42 is disposed in the lens barrel 18 and used for converging the electromagnetic wave of the wireless signal emitted by the antenna 14 . The lens 42 is made of a material that can pass through electromagnetic waves, for example. The high-frequency microwave plastic Rexolite 1422 has a dielectric constant of 2.53, a refractive index of 1.59, and a dissipation factor of 0.00066 at 10GHz, or other materials with low loss tangent. Such as Teflon and so on.

In this embodiment, the lens barrel 18 includes a cylinder body 20 and a protective cover 34 . The barrel 20 and the protective cover 34 are made of plastic, such as Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (Polycarbonate, PC), to prevent ultraviolet rays from penetrating. The cylinder body 20 is conical, and its two ends are open, one of which is the first end 18a. The first end 18 a has a joint portion 22 , and the joint portion 22 is detachably coupled around the opening 122 a of the casing 12 through a plurality of bolts S. As shown in FIG. The outer circumference of the barrel 20 has a plurality of reinforcing ribs 24 . The electromagnetic lens assembly 16 optionally includes a sealing ring 32 , and the sealing ring 32 is disposed between the joint portion 22 and the side plate of the casing 12 to achieve a sealing effect around the joint portion 22 and the opening 122 a. The other end of the barrel 20 is a first connecting end 26 for connecting the protective cover 34 . Protective cover 34 One side of the protective cover 34 is a second joint end 36, which is open, and the other side of the protective cover 34 is the second end 18b, which is closed.

Please refer to FIG. 3 to FIG. 12 , the cylinder body 20 has a plurality of support ribs 28 and a plurality of first positioning ribs on the inner wall near the first joint end 26, and the support ribs 28 and the first positioning ribs 30 are radial. arranged in shape. Four first positioning ribs 30 are taken as an example and slightly protrude from the first joint end 26 . The supporting ribs 28 form a shoulder of the barrel 20 . The inner wall of the protective cover 34 has a plurality of resisting ribs 38 and a plurality of second positioning ribs 40 , the resisting ribs 38 are radially arranged, and the resisting ribs 38 form a resisting portion. Four second positioning ribs 40 are taken as an example and slightly protrude from the second joint end 36 .

The lens 42 is a cylinder and has a flange portion 44 that protrudes radially. Please refer to FIG. 6 to FIG. The pressing rib 38 of the cover 34 abuts against the other side of the flange portion 44 to fix the lens 42 . The flange portion has a plurality of notches 442, taking a notch 442 on each side as an example, wherein the two first positioning ribs 30 extend into one of the notches 442, and the two first positioning ribs 30 respectively abut against the notches 442 Both sides, to limit the lens 42 can not rotate. The two second positioning ribs 40 of the protective cover 34 protrude between the corresponding two first positioning ribs 30 and respectively abut against the two first positioning ribs 30 to limit the protective cover 34 from rotating. The second joint end 36 of the protective cover 34 can be combined with the first joint end 26 of the barrel 20 , for example, through adhesive.

9 to 12, the main axis i of the lens 42 extends along the third axis Z, the lens 42 has an incident surface 46 and an outgoing surface 48 in the direction of the main axis, the incident surface 46 is flat and faces the first end 18a , the incident plane is perpendicular to the main axis i. The emitting surface 48 is a convex surface, and the shape of the emitting surface 48 has a curvature on the first axis X perpendicular to the main axis i, and has a curvature of 0 on the second axis Y perpendicular to the main axis i and the first axis X. . Define the radius of the projected circle of the exit surface 48 perpendicular to the main axis i as R (refer to FIG. 12); the radius of curvature of the exit surface 48 on the first axis X is Rc (refer to FIG. 11); the distance from the incident surface 46 to the antenna 14 on the main axis i is D (refer to FIG. 6); it satisfies: 0.50≦R/Rc≦0.6; 0.4≦R/D≦0.5.

When the above conditions are met, the wireless signal emitted from the emitting surface 48 can have good directional gain.

。透鏡42於主軸i上的厚度H1為12.6mm，凸緣部44的厚度H2為1.5mm。入射面46至天線於主軸上的距離D為76.7mm。R/Rc約為0.55，R/D約為0.45。R/D與天線14的波束的覆蓋範圍(或陣列天線的掃描角度)有關，其中R/D=tan(α)，2倍的α為波束的覆蓋範圍(或陣列天線的掃描角度)。 In this embodiment, the radius R1 of the cylinder of the lens 42 is 34.7mm, the periphery of the exit surface 48 has a fillet 50, the radius R of the projection circle of the exit surface 48 is 34.15mm, and the curvature radius Rc of the exit surface is 62mm . The thickness H of the emitting surface 48 on the main axis i is about 10.4mm,

. The thickness H1 of the lens 42 on the main axis i is 12.6 mm, and the thickness H2 of the flange portion 44 is 1.5 mm. The distance D from the incident surface 46 to the antenna on the main axis is 76.7mm. R/Rc is about 0.55, and R/D is about 0.45. R/D is related to the coverage of the beam of the antenna 14 (or the scanning angle of the array antenna), where R/D=tan(α), and α twice is the coverage of the beam (or the scanning angle of the array antenna).

In one embodiment, when the outer periphery of the emitting surface 48 does not have a fillet 50 , the projected circular radius R of the emitting surface is equal to the radius R1 (34.7 mm) of the cylinder. At this time, the thickness H of the emission surface 48 on the main axis is about 10.6 mm.

Please cooperate with FIG. 13 and FIG. 14 to compare the field diagram of the electromagnetic lens assembly 16 installed in this embodiment with the field diagram without the electromagnetic lens assembly 16. The electromagnetic lens assembly 16 of this embodiment is in the Z-X plane and Z-Y The peak gain of the plane is about 22.2dBi, the Z-X plane beamwidth is 6.2 degrees, and the Z-Y plane beamwidth is 29.3 degrees. When the electromagnetic lens assembly 16 is not installed, the peak gain in the Z-X plane and the Z-Y plane is about 17.9dBi, the beam width in the Z-X plane is 16.9 degrees, and the beam width in the Z-Y plane is 29.1 degrees. Lens 42 adds 4.3dB to peak gain.

In this way, the above-mentioned electromagnetic lens assembly 16 can perform directional gain on the wireless signal sent by the antenna 14 . After the electromagnetic lens assembly 16 is pulled down, the host 10 still has a wireless signal access device. set function, but can be used alone. In addition, a cover (not shown) may also be installed at the opening 122 a of the casing 12 of the host 10 to prevent moisture, dust, foreign matter, etc. from entering the casing 12 .

In one embodiment, the number of the notch 442 of the lens 42 can also be at least one, the barrel 20 can also have two first positioning ribs 30 extending into the notch 442 of the lens 42, and the protective cover 34 has two second positioning ribs. The rib 40 is used to extend between the two first positioning ribs 30 and respectively abut against the two first positioning ribs 30 .

In one embodiment, the number of the notch 442 of the lens and the number of the first positioning rib 30 can also be at least one, and the width of the notch 442 matches the width of the first positioning rib 30, so that the first positioning rib 30 can be inserted into the notch 442 The rotation of the lens 42 is limited.

In one embodiment, a plane lens (not shown) may also be provided on the housing 12 to close the opening 122a. The plane lens is made of a material that allows electromagnetic waves to pass through, for example. The high-frequency microwave plastic Rexolite 1422, or Teflon, etc., and the flat lens constitute the wireless signal penetration area.

15 to 18 are the wireless communication equipment 2 of the second preferred embodiment of the present invention, which has substantially the same structure as that of the first embodiment. The difference is that the casing 54 includes a housing 542 and a plane lens 544. The body 542 has an opening 542a. The plane lens 544 is disposed on the casing 542 and located at the opening 542a. The material of the plane lens 544 is the same as that of the lens 42 . The plane lens 544 constitutes a wireless signal penetration area. In addition, the first end 60a and the second end 60b of the lens barrel 60 of the electromagnetic lens assembly 58 are both open ends, and the outer peripheral surface of the lens barrel 60 is provided with a joint portion 62, which can be detachably fixed through a bracket 66 And the casing 54 , and the first end 60 a is spaced from the plane lens 544 . The lens 42 is located between the first end 60a and the second end 60b, and the emitting surface 48 of the lens 42 faces the second end 60b. An anti-ultraviolet coating (not shown) can be optionally provided on the body of the lens 42, and the anti-ultraviolet coating can be, for example, acrylate resin (Acrylate Resin), the anti-ultraviolet coating is arranged at least on the exit surface 48 or covers the surface of the entire body of the lens 42, so as to prevent the lens 42 from being degraded by ultraviolet rays for a long time and affecting electromagnetic wave convergence.

The inside of the lens barrel 60 also has a shoulder 64 for abutting against the flange 44 of the lens 42 . The flange 44 of the lens 42 can be bonded to the shoulder 64 , for example, through glue.

In this way, the electromagnetic lens assembly 58 performs directional gain on the wireless signal sent by the antenna 56 . After the electromagnetic lens assembly 58 is removed, the host 52 still has the function of a wireless signal access device and can be used alone.

19 to 21 are schematic diagrams of the lens 68 and the wireless communication device 3 of the third preferred embodiment of the present invention. In this embodiment, the antenna 76 takes a 2×4 array antenna as an example. The wireless communication device 3 also satisfies: 0.50≦R/Rc≦0.6; 0.4≦R/D≦0.5.

。透鏡68於主軸i上的厚度H1為11.17mm，凸緣部74的厚度H2為1.5mm。入射面70至天線76於主軸i上的距離D為66.1mm。R/Rc約為0.55，R/D約為0.45。 The radius R1 of the cylinder of the lens 68 is 30mm, and the periphery of the exit surface 72 has no fillet, so the projected circular radius R of the exit surface 72 is also 30mm, and the curvature radius Rc of the exit surface 72 is 53.6mm. The thickness H of the injection surface on the main axis is about 9.17mm, H=

. The thickness H1 of the lens 68 on the main axis i is 11.17 mm, and the thickness H2 of the flange portion 74 is 1.5 mm. The distance D between the incident surface 70 and the antenna 76 on the main axis i is 66.1 mm. R/Rc is about 0.55, and R/D is about 0.45.

Since the beam coverage of the 2×4 array antenna 76 (or the scanning angle of the array antenna) is small, the curvature radius Rc of the exit surface 72, the radius R of the projected circle, and the incident surface 70 to the antenna 76 are on the main axis i The distance D is shorter.

In this embodiment, the lens barrel (not shown) adopts the structure of the lens barrel 18 of the first embodiment, as long as the size is adjusted corresponding to the size of the lens 68 . Of course, the structure of the lens barrel 60 of the second embodiment can also be adopted.

Please cooperate with Figure 22 and Figure 23 to compare the field diagram of the electromagnetic lens assembly installed in this embodiment with the field diagram without the electromagnetic lens assembly installed. The electromagnetic lens assembly of this embodiment is on the Z-X plane The peak gain of plane and Z-Y plane is about 21.5dBi, the beam width of Z-X plane is 5.2 degrees, and the beam width of Z-Y plane is 32 degrees. When the electromagnetic lens assembly is not installed, the peak gain in the Z-X plane and the Z-Y plane is about 15.6dBi, the beam width in the Z-X plane is 20.9 degrees, and the beam width in the Z-Y plane is 44.3 degrees. Lens 68 adds 5.9dB to peak gain.

According to the above, the electromagnetic lens assembly of the present invention can directional gain the wireless signal sent by the antenna without increasing the thickness of the casing of the host. What's more worth mentioning is that after the electromagnetic lens assembly is detached, the main unit can also be used alone to send and receive wireless signals, effectively reducing the manufacturer's inventory pressure and cost for the case.

The above descriptions are only the preferred feasible embodiments of this creation, and all equivalent changes made by applying the instructions of this creation and the scope of the patent application should be included in the scope of the patent of this creation.

1: Wireless communication equipment

10: Host

12: Chassis

122: side panel

16: Electromagnetic lens assembly

18: lens barrel

18a: first end

18b: second end

20: barrel

22: Joint

24: Reinforcing rib

34: Protective cover

S: Bolt

X: the first axis

Y: the second axis

Z: the third axis

Claims (17)

A wireless communication device comprising: A casing and an antenna, wherein the casing has a wireless signal penetration area, the antenna is located in the casing and corresponds to the wireless signal transmission area, and the antenna transmits wireless signals through the wireless signal penetration area; and An electromagnetic lens assembly, including a lens barrel and a lens, the lens barrel has a first end and a second end opposite to each other in its axial direction, the first end is closer to the wireless signal penetration area than the second end The lens is arranged in the lens barrel and is used for converging electromagnetic waves. The lens has an incident surface and an exit surface in the direction of its main axis, wherein the incident surface of the lens is a plane, and the incident surface faces the first end; The emitting surface is convex, and the emitting surface has a curvature on a first axis perpendicular to the main axis and a curvature of 0 on a second axis perpendicular to the main axis and the first axis; Wherein, the radius of the projected circle of the projecting surface perpendicular to the main axis is R; the radius of curvature of the projecting surface on the first axis is Rc; the distance from the incident surface to the antenna on the main axis is D; It satisfies: 0.50≦R/Rc≦0.6; 0.4≦R/D≦0.5. The wireless communication device as described in claim 1, wherein the inner wall of the lens barrel has a shoulder; the lens is a cylinder and has a radially protruding flange portion, and the flange portion abuts against the shoulder department. The wireless communication device as claimed in claim 2, wherein the lens barrel includes a cylinder and a protective cover, the cylinder has the first end and the shoulder, and the shoulder is against one side of the flange, The protection cover is combined with the cylinder body and has a pressing part, and the pressing part is pressed against the other side of the flange part. The wireless communication device according to claim 3, wherein the flange part has at least one notch, and the inner wall of the lens barrel has at least one first positioning rib, and the at least one first positioning rib extends into the at least one The notch restricts the lens from turning. The wireless communication device as described in claim 4, wherein the at least one first positioning rib includes two first positioning ribs, and the two first positioning ribs respectively abut against the two sides of the gap; the protective cover has two second Positioning ribs, the two second positioning ribs extend between the two first positioning ribs and respectively overlap the two first positioning ribs. The wireless communication device according to claim 3, wherein the inner wall of the cylinder has a plurality of supporting ribs, and the supporting ribs form the shoulder; the protective cover has a plurality of pressing ribs, and the pressing ribs form the shoulder. Compression part. The wireless communication device according to claim 1, wherein the second end of the lens barrel is an open end, the lens is located between the first end and the second end, and the emitting surface faces the second end; wherein An anti-ultraviolet coating is provided on the lens, and the anti-ultraviolet coating is at least arranged on the emitting surface. The wireless communication device as described in claim 1, wherein the casing includes a housing and a plane lens, the housing has an opening, the plane lens is arranged on the housing and is located at the opening, and the plane lens constitutes the Wireless signal penetration area. An electromagnetic lens assembly, comprising: A lens barrel has a first end and a second end opposite to each other in its axial direction; and A lens is arranged in the lens barrel and is used for converging electromagnetic waves. The lens has an incident surface and an exit surface in the direction of its main axis, wherein the incident surface of the lens is a plane, and the incident surface faces the first end; The emitting surface is convex, and the emitting surface has a curvature on a first axis perpendicular to the main axis and a curvature of 0 on a second axis perpendicular to the main axis and the first axis; Wherein, the radius of the projected circle perpendicular to the main axis of the projecting surface is R; the radius of curvature of the projecting surface on the first axis is Rc; which satisfies: 0.50≦R/Rc≦0.6. The electromagnetic lens assembly as described in claim 9, wherein the inner wall of the lens barrel has a shoulder; the lens is a cylinder and has a radially protruding flange portion, the flange portion abuts against the shoulders. The electromagnetic lens assembly as claimed in claim 10, wherein the lens barrel includes a cylinder and a protective cover, the cylinder has the first end and the shoulder, and the shoulder abuts against one side of the flange , the protective cover is combined with the cylinder body and has a pressing portion, and the pressing portion is pressed against the other side of the flange portion. The electromagnetic lens assembly as described in Claim 11, wherein the flange portion has at least one notch, and the inner wall of the lens barrel has at least one first positioning rib, and the at least one first positioning rib extends into the at least one A notch to restrict the lens from turning. The electromagnetic lens assembly as described in claim 12, wherein the at least one first positioning rib includes two first positioning ribs, and the two first positioning ribs respectively abut against both sides of the notch; the protective cover has two second positioning ribs Two positioning ribs, the two second positioning ribs extend between the two first positioning ribs and overlap the two first positioning ribs respectively. The electromagnetic lens assembly as claimed in claim 11, wherein the inner wall of the cylinder has a plurality of supporting ribs, and the supporting ribs form the shoulder; the protective cover has a plurality of pressing ribs, and the pressing ribs form The pressing part. The electromagnetic lens assembly as claimed in claim 9, wherein the second end of the lens barrel is an open end, the lens is located between the first end and the second end, and the emitting surface faces the second end; An anti-ultraviolet coating is provided on the lens, and the anti-ultraviolet coating is at least arranged on the emitting surface. A lens for converging electromagnetic waves, wherein the lens has an incident surface and an exit surface in the direction of its main axis, the exit surface is a convex surface, and the exit surface has a curvature on a first axis perpendicular to the main axis. The curvature of a second axis perpendicular to the main axis and the first axis is 0; wherein, the incident surface of the lens is a plane; the radius of the projected circle perpendicular to the main axis is R; The radius of curvature of the surface along the first axis is Rc, which satisfies: 0.50≦R/Rc≦0.6. The lens according to claim 16, wherein the lens is a cylinder and has a radially protruding flange.

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