Electronic cigarette

Abstract

The present invention discloses an electronic cigarette, which includes a housing, a PCB board and two thimbles; a gap extending in a first direction is provided on an outer wall surface of the housing, a first power feeding portion and a second power feeding portion are respectively provided at positions on opposite sides of the housing on both sides of the gap, the length of the gap is L1, and the distance between the first power feeding portion and the second power feeding portion and the nearest end of the gap is L1 / 15. The PCB board is installed in the housing, one ends of the two thimbles are respectively electrically connected to the housing on opposite sides of the gap in a power feeding manner, and the other ends are both electrically connected to the PCB board in a power feeding manner, and are used for transmitting or receiving electromagnetic wave signals outward; the technical solution of the present invention improves the radiation efficiency of the antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic cigarettes, and particularly relates to an electronic cigarette. Background Art

[0002] Electronic cigarettes are emerging electronic products in recent years. Their main function is to heat or burn tobacco leaves (e - liquid) to release smoke - like substances. However, as time goes by, the content of the products is becoming more and more abundant. Buyers need new functions, and sellers need to understand the daily usage of customers. Thus, the concept of wireless electronic cigarettes has emerged, that is, adding functions such as data transmission on the basis of traditional electronic cigarettes.

[0003] The outer shells of electronic cigarettes on the market are generally made of metal materials to increase their aesthetics. Then, an antenna is installed inside the electronic cigarette to achieve the data - transmission function of the electronic cigarette. However, the metal - material shell has a great influence on the radiation performance of the antenna and cannot effectively radiate the signal out, resulting in a very low radiation efficiency of the antenna. Summary of the Invention

[0004] The main purpose of the present invention is to provide an electronic cigarette, aiming to improve the radiation efficiency of the antenna.

[0005] To achieve the above purpose, the electronic cigarette proposed by the present invention includes:

[0006] A housing, on the outer wall surface of which there is a slit extending along a first direction. On the relative positions of the housing on both sides of the slit, there are respectively a first feeding part and a second feeding part. The length of the slit is L1, and the distance between the first feeding part and the second feeding part and the nearest end of the slit is L1 / 15;

[0007] A PCB board, installed inside the housing; and

[0008] Two thimbles, one end of each of the two thimbles is fed and connected to the housing on both opposite sides of the slit respectively, and the other ends are both fed and connected to the PCB board, for transmitting or receiving electromagnetic wave signals outward.

[0009] Optionally, the length of the housing is 100 mm and the diameter is 15 mm.

[0010] Optionally, the first direction is the axial direction of the housing, and the length of the slit is less than the length of the housing.

[0011] Optionally, the first direction is the circumferential direction of the housing, and the length of the slit is less than the circumference of the housing.

[0012] Optionally, the slit is filled with a dielectric.

[0013] Optionally, the medium is placed in the gap by in-mold injection.

[0014] Optionally, the medium is a resin material.

[0015] Optionally, the PCB board is located inside the housing and is disposed opposite to the gap.

[0016] Optionally, the two thimbles, the PCB board, and the housing at the farthest end from the first feeding portion enclose a back cavity, and the back cavity is used to reduce the frequency of the slot antenna.

[0017] Optionally, the wavelength of the transmitted or received electromagnetic wave signal is λ, and the length of the PCB board ≥ λ / 4.

[0018] The technical solution of the present invention is to set a gap on the outer wall surface of the housing, install the PCB board inside the housing, and respectively abut the two ends of the two thimbles against the PCB circuit board and the housing on the opposite sides of the gap to transmit or receive electromagnetic wave signals outward, so as to realize the data transmission function of the electronic cigarette. Further, the distance between the first feeding portion and the second feeding portion and the nearest end of the gap is L1 / 15, that is, the thimble uses a partial feeding method to realize the feeding of the housing on the opposite sides of the gap. Since the positive feeding method will make the impedance of the antenna larger, while the partial feeding can reduce the impedance of the antenna and make the impedance within a predetermined range, thereby improving the radiation efficiency of the antenna. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the structures shown in these drawings.

[0020] Figure 1 It is the rear view of an embodiment of the electronic cigarette of the present invention;

[0021] Figure 2 It is the top view of an embodiment of the electronic cigarette of the present invention;

[0022] Figure 3 It is the antenna gain curve graph of an embodiment of the electronic cigarette of the present invention;

[0023] Figure 4 It is the antenna gain curve graph of the H-plane of an embodiment of the electronic cigarette of the present invention;

[0024] Figure 5 It is the antenna gain curve graph of another embodiment of the electronic cigarette of the present invention.

[0025] Explanation of the reference numerals in the drawings:

[0026] Label Name Label Name 10 Housing 14 Back cavity 11 First feeding part 20 PCB board 12 Second feeding part 30 Ejector pin 13 Gap

[0027] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" throughout the text includes three solutions. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0032] Referring to Figure 1 and Figure 2 , the present invention provides an electronic cigarette, comprising:

[0033] A housing 10, on the outer wall surface of the housing 10, there is a slit 13 extending in a first direction. At positions on the housing 10 opposite to each other on both sides of the slit 13, there are respectively a first feeding portion 11 and a second feeding portion 12. The length of the slit 13 is L1, and the distance between the first feeding portion 11 and the second feeding portion 12 and the nearest end of the slit 13 is L1 / 15;

[0034] A PCB board 20, installed inside the housing 10; and

[0035] Two thimble pins 30, one ends of the two thimble pins 30 are respectively fed and connected to the housing 10 on both opposite sides of the slit 13, and the other ends are both fed and connected to the PCB board 20, for transmitting or receiving electromagnetic wave signals outward.

[0036] The technical solution of the present invention is to set a slit 13 on the outer wall surface of the housing 10, install the PCB board 20 inside the housing 10, and the two ends of the two thimble pins 30 respectively abut against the PCB circuit board and the housing 10 on both opposite sides of the slit 13 to transmit or receive electromagnetic wave signals outward, so as to realize the data transmission function of the electronic cigarette. Further, the distance between the first feeding portion 11 and the second feeding portion 12 and the nearest end of the slit 13 is L1 / 15, that is, the thimble pins 30 adopt an off-center feeding method to realize the feeding of the housing 10 on both opposite sides of the slit 13, so that the impedance is not affected by the reflected electromagnetic wave signals, thereby improving the radiation efficiency of the antenna.

[0037] It can be understood that since the radiation antenna and the dipole antenna are complementary, so Zs×Zd = η2 / 4 (Zd is the dipole impedance, Zd = 73.1Ω, η is the air wave impedance, η = 120π), and then the impedance Zs of the radiation antenna is obtained to be approximately 486Ω, and its impedance is much larger than the input impedance of 50Ω, so the radiation efficiency is low. Therefore, off-center feeding should be adopted to improve the radiation efficiency of the antenna; further, when the feeding position is at L1 / 15, the off-center feeding of the thimble pins 30 can be easily realized, so that the impedance of the antenna drops to within 50Ω, thereby improving the radiation efficiency of the antenna.

[0038] In an embodiment, the housing 10 is cylindrical, the length L2 of the housing 10 is 100mm, and the diameter D is 15mm. If the first direction is the axial direction of the housing 10, the length of the slit 13 is less than the length of the housing 10, that is, L1 < 100mm; if the first direction is the circumferential direction of the housing 10, the length of the slit 13 is less than the circumference of the housing 10. The circumference C of the housing is C = πD = π×15mm≈47.1mm, that is, L1 < 47.1mm; in other embodiments, the length and diameter of the housing can be changed according to actual needs.

[0039] Taking L2 = 100 mm, D = 15 mm, the electromagnetic wave being Bluetooth, and the first direction being the axial direction of the housing 10 as an example, that is, the frequency of the electromagnetic wave is 2400 MHz to 2500 MHz, and the theoretical length of the slot 13 should be L1 = λ / 2 (λ is the wavelength of the electromagnetic signal). According to the calculation formula of the electromagnetic wave c = λf (c is the speed of light, f is the frequency), λ≈120 mm can be obtained. At this time, the theoretical length L1 of the slot 13 is approximately 60 mm. When the first direction is the axial direction, L1 < 15π. Therefore, without subsequent operations, the length of the slot 13 is too long and cannot meet the requirements of this application.

[0040] Referring to Figure 3 and Figure 4 , therefore, further, to solve the problem that the length of the slot cannot be satisfied, a medium is filled in the slot 13. The actual wavelength λ1 of the Bluetooth band for the electromagnetic wave is approximately 120 mm. In this embodiment, when the first direction is the axial direction, the length L1 of our slot 13 is L1 = 3 / 4πD, that is, L1≈35 mm. According to the formula L1 = λ / 2, the theoretical wavelength λ2 = 70 is deduced. According to the empirical formula the relative permittivity Er≈7.5 is obtained, which indicates that when a medium with a relative permittivity of 7.5 is used, the theoretical length of the slot 13 can be made about 35 mm, which shows that filling the medium improves the radiation efficiency of the antenna, is beneficial to reducing the size of the slot 13 (the size mentioned in this application mainly refers to the length of the slot 13), and at the same time reducing the length of the slot also makes the appearance of the housing more beautiful, enabling a slot of a predetermined size to be designed in the limited housing, increasing the manufacturability of the slot antenna on the electronic cigarette. Considering the feasibility of assembly, materials such as resin can be used as the medium. The relative permittivity Er of such materials ranges from 2.0 to 12.9. The 7.5 relative permittivity material required in this application is within the range of such common materials; as Figure 3 shown, when a material with Er = 12.9 is used, good impedance matching can be achieved immediately; Figure 4 In, 80deg and 90deg represent the Theta angle, the radiation intensity in the Y-axis direction. The larger the value in the Y-axis direction, the stronger the radiation intensity outward.

[0041] It should be noted that 0 db indicates that the signal emitted by the antenna is completely reflected back by the housing 10, -1 db: that is, it indicates that 79% of the signal emitted by the antenna is emitted outward and 21% is reflected back; -10 db: that is, it indicates that 90% of the signal emitted by the antenna is emitted outward and 10% is reflected back; -20 db: that is, it indicates that 99% of the signal emitted by the antenna is emitted outward and 1% is reflected back; that is, the smaller the db, the stronger the radiation ability outward.

[0042] Specifically, in the gap 13, the medium is placed in the gap 13 by in-mold injection. Of course, in other embodiments, it can also be adhered to the housing 10 on both sides of the gap 13 by an adhesive method.

[0043] Further, theoretically, the larger the Er, the greater the difficulty of obtaining it. Commonly available media usually have Er = 2.0 - 5.0. In this embodiment, it is assumed that a medium with Er = 3 is used. If it is desired to achieve resonance in the 2500 MHz frequency band in this state, other means of reducing the frequency are also required. It should be noted that the frequency reduction mentioned in this application is because when passing through the relatively short e-cigarette gap 13 in the 2500 MHz frequency band, its frequency band will increase. Therefore, the frequency band needs to be reduced to 2500 MHz.

[0044] Refer to Figure 5 , therefore, in order to solve the problem that when using a medium with a lower dielectric constant, its frequency is relatively high, in this embodiment, the PCB board 20 is located inside the housing 10 and is disposed opposite to the gap 13. The two thumbtacks 30, the PCB board 20, and the housing 10 at the farthest end from the first feeding portion 11 of the gap 13 enclose a back cavity 14. The back cavity 14 is used to reduce the frequency of the gap 13 antenna; by Figure 5 It can be clearly seen that when there is a back cavity, more signals are emitted outward and the frequency reduction is more obvious; when there is no back cavity, the frequency reduction effect is poor at frequencies of 2400 MHz - 2500 MHz.

[0045] It can be understood that since the PCB board 20 is connected to the outer shell through Pogopin, there will also be a relatively large current on the PCB board 20. The antenna effect of the PCB board 20 cannot be ignored. The current shunted on the PCB board 20 is similar to a folded antenna. When the length of the PCB is greater than or equal to λ / 4 (about 30 mm), the frequency reduction effect is obvious; by cooperating with multiple means such as setting the back cavity 14, designing the length of the PCB board, and filling the medium, the radiation efficiency of the gap antenna is increased by multiple means, while the stability of the gap antenna is increased, and the selection range of the filling material for the gap is also expanded, enhancing the possibility of the solution being realized in reality.

[0046] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electronic cigarette, characterized in that, Comprising: A housing, on the outer wall surface of which there is a slit extending in a first direction. At positions on the opposite sides of the housing on both sides of the slit, a first feeding part and a second feeding part are respectively provided. The length of the slit is L1, and the distance between the first feeding part and the second feeding part and the nearest end of the slit is L1 / 15; A PCB board, installed inside the housing; And Two thimbles, one ends of the two thimbles are respectively fed and connected to the housing on the opposite sides of the slit, and the other ends are both fed and connected to the PCB board, for transmitting or receiving electromagnetic wave signals outward; The slit is filled with a medium, and the medium is a resin material; The PCB board is located inside the housing and is arranged opposite to the slit; The two thimbles, the PCB board and the housing at the farthest end of the slit from the first feeding part enclose a back cavity, and the back cavity is used to reduce the frequency of the slit antenna; The wavelength of the transmitted or received electromagnetic wave signal is λ, and the length of the PCB board ≥ λ / 4.

2. The electronic cigarette according to claim 1, wherein, The length of the housing is 100 mm and the diameter is 15 mm.

3. The electronic cigarette according to claim 1, wherein The first direction is the axial direction of the housing, and the length of the slit is less than the length of the housing.

4. The electronic cigarette according to claim 1, wherein, The first direction is the circumferential direction of the housing, and the length of the slit is less than the circumference of the housing.

5. The electronic cigarette according to claim 1, characterized in that, In the slit, the medium is placed in the slit by the method of in-mold injection.

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