TWI835672B - Electronic seal having spring antenna - Google Patents

Abstract

The primary contents of the present invention are that a spring is arranged at a location corresponding to a locking hole of a bolt seat in order to provide control of the spring in direct electrical connection with a circuit device when a bolt pin is applied to lock up with the bolt seat to activate a radio-frequency identification (RFID) chip. The spring provides preloading for the electrical connection and the spring is controlled and set to match with a host device frequency band. Such technical contents can greatly reduce working hours and enhance efficiency and can make achievement that meets economic principles with automatized production and effectively enhances quality, so as to alleviate, to a great extent, the defect problems of the prior art discussed above.

Other contents of the present invention are that the spring comprises a compression helical spring, and the compression helical spring and the bolt pin are arranged along a common center axis line, so as to make the compression helical spring symmetrically encompass and loop around the center axis line of the bolt pin, and making the compression helical spring not causing change of a relative position of the lower monopole antenna with respect to a movable door panel resulting from self-rotations of the bolt pin and the bolt seat, so as to effectively alleviate the drawbacks of frequency Other contents of the present invention are that the spring comprises a compression helical spring, and the compression helical spring and the bolt pin are arranged along a common center axis line, so as to make the compression helical spring symmetrically encompass and loop around the center axis line of the bolt pin, and making the compression helical spring not causing change of a relative position of the lower monopole antenna with respect to a movable door panel resulting from self-rotations of the bolt pin and the bolt seat, so as to effectively alleviate the drawbacks of frequency instability of a lower monopole antenna due to being eccentric and positional deviation of the prior art discussed above, allowing a host device to readily read and access, and therefore, the present invention provides improvement in respect of demonstrating high accuracy and precision.

Description

Electronic seal with spring antenna

The invention is a technology that uses a spring as a monopole antenna under an electronic seal. Its diameter is economical, effectively improves assembly accuracy, maintains high quality, and can be produced automatically. ． ． Wait for progress.

The prior art is like the US010510272 patent approved by the inventor. However, after market feedback, it was found that it has the following shortcomings:

1. The monopole antenna under the previous case is composed of an aluminum sticker bonded to the slider of the lock base, and then a spring is used to push the slider to maintain the electrical connection with the circuit board of the bolt. The aluminum sticker must be manually Self-adjusted bonding to the slider not only consumes a lot of accumulated man-hours, but also cannot improve the efficiency of bonding aluminum stickers, and it is even more difficult to increase economic benefits. This is an area where current production technology cannot make breakthroughs. It should be noted here that the spring in the previous case is not the lower monopole antenna, but simply provides the preload of the slider.

2. In the previous case, when the aluminum sticker was manually bonded to the slider, because the aluminum sticker was very thin, it was very easy to break and wrinkle during the bonding process, and manual labor would inevitably lead to carelessness, emotional instability or poor technique. Due to skill problems, the aluminum stickers are not adhered in the correct position, so the quality is difficult to control. As a result, when applying electronic seals for customs clearance, the customs host computer may not be able to read or it is difficult to read, which is very troublesome for the industry.

3. During the production of the aluminum sticker in the previous case, a large amount of release paper will be produced that needs to be discarded, which will inevitably cause environmental problems, and the material cost of the aluminum sticker cannot be further reduced.

4. The aluminum sticker in the previous case needs to be of a certain length to match the length of the bolt and the frequency band of the customs host. Therefore, the slider of the lock seat needs to provide enough area for the aluminum sticker to adhere. As a result, the volume of the lock seat cannot be effectively reduced. , resulting in the inability to fully reduce the material cost of the lock seat.

5. The previous case closed the bolt hole of the container door bolt. When the container is transported, the bolt will inevitably rotate within the bolt hole range to cope with the force generated by transportation, so the lock seat and aluminum sticker will also be The bolt is driven by the bolt and rotates together. However, since the aluminum sticker is not symmetrically arranged around the central axis of the bolt and the lock seat, the aluminum sticker will inevitably be eccentrically displaced relatively close to or relatively far away from the container door, resulting in a single pole. The frequency of the antenna is extremely unstable, which makes it difficult to read or the reading distance is insufficient when passing through the customs host. This shortcoming is even more serious when the customs host uses a European frequency band with an extremely narrow bandwidth.

The main content of the present invention is to use a spring installed at a position corresponding to the lock hole of the lock seat to provide a latch when the lock seat is locked. The spring is further controlled to directly electrically connect the circuit device to activate the RFID chip. In addition to providing electrical connection, the spring In addition to the required pre-pressure, the spring is further controlled to match the frequency band monitored by the customs host. This technical content can not only significantly save man-hours and improve efficiency, but also achieve economic principles and effectively improve quality under automated production. This greatly improves the disadvantages of the previous case and indeed provides a novel technology that effectively solves the problem of electronic seal manufacturing.

Another content of the present invention is that the further control spring adopts a compression coil spring, and the compression coil spring and the bolt are arranged on the same central axis, so that the compression coil spring is symmetrically arranged around the central axis of the bolt, so that the compression coil spring is symmetrically arranged around the central axis of the bolt. The compression coil spring will not change the position of the lower monopole antenna relative to the container door due to the rotation of the bolt and the lock seat, so it can effectively improve the problem of easy eccentric loss of position of the upper cover, allowing the customs host to read more smoothly, and use The accuracy of the present invention is sufficient to provide both European and American customs host monitoring, so the present invention has the advantages of high-precision use and wide application range.

A:bolt

10: Bolts

11: Shaft

12: hat head

13:Volume

131: Hole top

132:Bottom of hole

133: hole body

14: Upper buckle

20:Circuit device

20A: Front

20B:Back

211:Public plug parts

212:Female plug

213:Through hole

214: Tip parts

22: Main circuit

221: Lower contact

222: Matching lines

223:Bridge line

23: Radiation unit

24:RFID chip

241: Main signal pin

242: Secondary signal pin

243: Fixed feet

25: Conductive part

251: Leading wire

252:Rear wire

26:Quarantine Zone

H: Settlement area

B:Lock seat

30: Shell

31:Box room

32:Keyhole

33:Shoulder

34: Bottom cover

40: base

41:The first hole

42:Second hole

43:Third hole

44:Fourth hole

50: lower buckle

51:Blocking ring

511:Fifth hole

512: Push and pull hole

52:Buckle

60:Lower monopole antenna

61:Spring

62: Slider

621: Nosed edge

C:Door bolt

Figure 1 is an exploded schematic diagram of the present invention.

Figure 2 is a schematic front view of the circuit device of the present invention.

Figure 3 is a schematic view of the back of the circuit device of the present invention.

Figure 4 is a schematic diagram of the positions of the bolt, lock seat and door bolt of the present invention.

Figure 5 is a schematic cross-sectional view of Figure 4.

Figure 6 is a schematic cross-sectional view of the position A-A in Figure 5.

Figure 7 is a schematic diagram of the combination of Figure 5.

Figure 8 is a schematic diagram of the position of the radiating unit when the bolt and the lock seat are locked according to the present invention.

Figure 9 is a schematic diagram of the electromagnetic wave operation of the standard dipole antenna pattern of the present invention.

As shown in Figure 4, the electronic seal of the present invention is composed of a bolt A and a lock seat B. The bolt A can lock the lock seat B from top to bottom to lock the container door bolt C so that the customs host can monitor the container. Whether door bolt C is opened normally.

Please refer to Figures 1 to 7. The plug A is composed of a circuit device 20 installed inside a bolt 10; wherein;

The bolt 10 is made of metal conductive material and has a shaft 11, a cap 12 that expands radially outward at the top of the shaft 11, a hole 13 that opens downward, and a ring recessed in the lower part of the shaft 11. On the outer circumference of the buckle 14, the hole 13 is arranged along the axial direction of the shaft 11, and defines a closed hole top 131, an open hole bottom 132, and a hole between the hole top 131 and the hole bottom 132. body 133, so that the hole bottom 132 connects the inside and outside of the bottom end of the hole body 133;

The circuit device 20 is made of a double-layer printed circuit board. It can also be made of a flexible circuit board, spray material or wire. It defines a front side 20A and a back side 20B opposite to the front side 20A, so that it can move from bottom to top. is inserted into the hole 13, and is then completely fixed to the hole body 133. The fixing method is to provide a public plug 211 between the front surface 20A and one side of the hole body 133, and between the back surface 20B and the other side of the hole body 133. There is a female plug 212 between the two sides, and the circuit device 20 is provided with a through hole 213 for the tip 214 to install the male plug 211 and the female plug 212 on the circuit device 20 so that the male plug 211 and the female plug The member 212 can withstand the radial pressing of the hole body 133, thereby clamping the circuit device 20;

The circuit device 20 uses etching technology to provide a main circuit 22 on the front 20A, and a planar radiation unit 23 on the bottom edge of the back 20B; the main circuit 22 is provided with a lower contact 221 at the bottom of the circuit device 20. The top of the device 20 is provided with a matching circuit 222, and a bridge circuit 223 is provided between the lower contact point 221 and the middle point of the matching circuit 222, so that the matching circuit 222 and the bridge circuit 223 can be arranged vertically in a wide range The position relative to the shaft 11 allows the shaft 11 to interrupt the main circuit 22 when sheared to meet the need to open the container. Furthermore, in the present invention, the circuit device 20 is completely built-in and fixed in the hole 13. Therefore, a set of control area H can be controlled to be maintained between the lower contact 221 and the bottom end of the hole 13 to facilitate the operation described later; the main circuit 22 and the radiation unit 23 are electrically connected to an RFID chip 24 to form a radio frequency circuit ( Radio Frequency Circuit), the RFID chip 24 is installed on the top edge of the front surface 20A, and has a main signal pin 241 connected to one end of the matching line 222, a secondary signal pin 242 connected to the other end of the matching line 222, and an auxiliary support. fixed feet 243;

The circuit device 20 has a hole-shaped conductive part 25 penetrating through the top edge. The conductive part 25 has a front end connected to the matching line 222 connected to one end of the front wire 251, and a rear end of the conductive part 25 connected to the radiating unit 23 connected to the rear wire. 252 is used to provide electrical connection between the RFID chip 24, the main circuit 22 and the radiating unit 23, and also controls the radiating unit 23 and the lower contact 221 to maintain an isolation area 26 as shown in Figure 3 to prevent the radiating unit 23 from connecting with the lower contact. Point 221 forms a short circuit. It is particularly noted here that the main circuit 22, RFID chip 24 and conductive portion 25 cannot be directly electrically connected to the bolt 10 to prevent the circuit device 20 from easily sending a signal due to mistaken contact with the bolt 10; the present invention Mainly by controlling the area parameters of the planar radiating unit 23 and the relative position parameters of the hole 13, the radiating unit 23 can be coupled to the hole 133 without contacting the hole 133. (Coupling feed) effect is used to make the bolt 10 constitute a monopole antenna (Monopole Antenna) on the circuit device 20. This coupling feed effect is not the capacitive energy storage effect of general electronic circuits, but uses the radiating unit 23 and The hole body 133 generates a frequency response (Frequency response), allowing the signal of the radio frequency circuit to be coupled and fed in to transmit the electromagnetic wave signal to the hole body 133 of the electrical connection bolt 10. At this time, the upper monopole antenna has excessive gain (Gain). is low and cannot directly activate the RFID chip 24; special It is stated that when the area of the radiation unit 23 exceeds the area parameter, it will directly form an antenna function. At this time, the signal of the RFID chip 24 will be blocked in the metal hole 13 and cannot send and receive signals through the bolt 10. In addition, , when the area of the radiating unit 23 is smaller than the area parameter, the radiating unit 23 cannot produce a frequency response with the bolt 10, so it is still unable to send and receive signals through the bolt 10;

Lock base B is composed of shell 30, base 40, lower buckle 50 and lower monopole antenna 60;

The shell 30 is generally cylindrical, and has a box chamber 31 concave from bottom to upward, and a lock hole 32 upwardly connected from the top of the box chamber 31, so that the diameter of the lock hole 32 is sufficient for the lower part of the bolt 10 to be inserted and is smaller than the box chamber. The aperture 31 is small, so the top of the box chamber 31 forms a shoulder 33, and the bottom end of the box chamber 31 can be installed and closed through a bottom cover 34;

The base 40 is fixed in the box chamber 31 so as to be positioned between the shoulder 33 and the bottom cover 34. The base 40 is sequentially connected from top to bottom with a first hole 41 arranged coaxially with the lock hole 32, The second hole 42, the third hole 43, and the fourth hole 44 are controlled to have a diameter equal to that of the keyhole 32 for inserting the bottom end of the bolt 10. The diameter of the first hole 41 is larger than that of the second hole 41. The hole 42 has a large diameter, which is used to install the lower buckle 50 described later. In addition, the third hole 43 has a smaller diameter than the second hole 42. The fourth hole 44 has a diameter larger than the third hole 43, so that the third hole 43 has a larger diameter than the third hole 43. 43 and the fourth hole 44 can be used for installing the lower monopole antenna 60 described later;

The lower buckle 50 is composed of a blocking ring 51 and a buckle 52. The blocking ring 51 is placed in the first hole 41 and the top is positioned at the shoulder 33. It has a fifth hole through which the bottom end of the bolt 10 can pass. 511. The bottom end of the fifth hole 511 is coaxially connected to a push-out hole 512. The diameter of the push-out hole 512 is gradually expanded downward. As for the buckle 52, it is installed within the scope of the push-out hole 512. The diameter is larger than the second hole 42, so as to produce a snap when facing the upper buckle 14, so that the buckle ring 52 can restrict the bolt 10 from coming out of the lock seat B;

The lower monopole antenna 60 is composed of a spring 61 installed in the fourth hole 44 and a slider 62 slidably fitted in the third hole 43. The spring 61 is in contact with the bottom cover 34 and the slider 62. Between the bottom ends, as for the bottom end of the slider 62, a flange 621 is expanded radially outward, so that the spring 61 provides a preload to the slider 62, and the flange 621 of the slider 62 is urged to stop in the fourth hole 44 The top is used to control the top of the slider 62 to remain suspended and positioned at the second hole 42 at any time, so that it can be relatively inserted into the sleeve area H and match the lower contact 221; here is a special explanation, the present invention further defines that the spring 61 adopts a compression method. The coil spring, and the compression coil spring and the bolt 10 are configured on the same central axis, so that the compression coil spring is symmetrically arranged around the central axis of the bolt 10, so that the compression coil spring will not be affected by the bolt 10 and the lock. The rotation of the base B changes the position of the lower monopole antenna 60 relative to the container door. More importantly, the present invention further controls the total length of the spring 61 to match the frequency band monitored by the customs host. The total length is defined when the spring 61 is stretched in a straight line. Size, specifically, the total length of the spring 61 and the frequency band of the customs host are set to one-eighth of the wavelength. Furthermore, the wavelength is the speed of light divided by the frequency of the customs host. When the monopole antenna is in the air without metal shielding , its optimal frequency response is a quarter of the wavelength, but the present invention is used on a container door with a large surface of metal, causing the frequency response of the lower monopole antenna 60 to shift to about one-eighth of the wavelength, because the spring 61 It will not lose its position eccentrically as the bolt 10 and the lock seat B rotate, and a fixed frequency response can be obtained, with a bandwidth sufficient to cover the frequency bands of the US and European customs hosts.

Please refer to Figures 4 to 7. When the lower part of the bolt 10 is inserted into the lock hole 32 to lock the container door bolt C, while the lower part of the bolt 10 continues to be inserted into the lock hole 32, the top of the slider 62 will enter relatively The latch area H abuts the lower contact point 221, and then, against the pre-pressure of the spring 61, the lower part of the bolt 10 continues to be inserted downward into the lock hole 32, so that the upper buckle 14 is positioned on the lower buckle 50. The bolt 10 is locked on the lock seat B and cannot come out, Keep the top of the slider 62 electrically connected to the lower contact 221, so that the spring 61 and the slider 62 form a monopole antenna 60 under the RFID chip 24, thus gaining the upper monopole antenna, so that the upper monopole antenna and the lower monopole antenna 60 Combined into a standard dipole antenna (Dipole Antenna) as shown in Figures 8 and 9, it can emit RFID band or microwave band signals that can be identified and managed by the customs host, thereby ensuring effective monitoring of container locking. If you want to open the container door normally Bolt C, it only needs to use hydraulic scissors to destroy the bolt 10 to cut off the main circuit 22, thereby interrupting the signal; in particular, the present invention can use the lower contact 221 and the top of the lower monopole antenna 60 The area parameter setting and the spacing parameter setting are used to control the coupling feed effect between the lower contact point 221 and the top of the lower monopole antenna 60 without contact when the bolt 10 locks the lock seat B, so that the lower contact point 221 The top of the lower monopole antenna 60 transmits electromagnetic wave signals and is electrically connected to each other.

The invention clearly has the following advantages:

1. The present invention allows the lower monopole antenna to be automatically installed to the predetermined position of the lock base through the overall configuration of the bolt, lock base, keyhole, and spring. This is naturally more convenient and faster than the excessive manual work of the previous method, and significantly improves the installation speed. The production efficiency is improved, so that the present invention is progressive in line with economic benefits.

2. Since the present invention eliminates the process of artificial bonding of the monopole antenna, its accuracy is bound to be better than conventional manual bonding, and it avoids the defective rate caused by manual labor due to slight haste, carelessness, carelessness, emotional instability or unskilled skills.

3. The present invention controls the spring and the bolt to be arranged on the same central axis, so that the spring is symmetrically arranged around the central axis of the bolt, so that the spring will not change the relative position of the lower monopole antenna due to the rotation of the bolt and the lock seat. The position of the container door can effectively improve the shortcomings of the previous case that is easy to be eccentric and out of position, and the accuracy of the present invention is sufficient. At the same time, it provides European and American customs host monitoring, so the invention has the advantages of high-precision use and wide application range.

4. In addition to completely hiding the lower contact of the circuit device in the hole of the bolt, the present invention also controls to maintain a detent area between the lower contact and the bottom end of the hole. This configuration can indeed easily remove the previous circuit device. The problem of being pulled out and erroneously triggering a signal. Furthermore, during the process of locking the bolt, the top of the lower monopole antenna is controlled to relatively enter the locking area, so that the lower monopole antenna and the lower contact can be electrically connected. The overall configuration is quite reasonable, and it is extremely industrially applicable and progressive.

A:bolt

10: Bolts

11: Shaft

12: hat head

131: Hole top

133: hole body

14: Upper buckle

20:Circuit device

20A: Front

214: Tip parts

22: Main circuit

221: Lower contact

222: Matching lines

223:Bridge line

24:RFID chip

241: Main signal pin

242: Secondary signal pin

243: Fixed feet

B:Lock seat

30: Shell

31:Box room

32:Keyhole

33:Shoulder

34: Bottom cover

40: base

42:Second hole

43:Third hole

44:Fourth hole

50: lower buckle

51:Blocking ring

512:Push and pull hole

52:Buckle

61:Spring

62: Slider

621: Nosed edge

C:Door bolt

Claims (7)

An electronic seal with a spring antenna, which at least includes: a plug, which is composed of a bolt and a circuit device; the bolt has an upper buckle and a hole in which the circuit device is installed; the circuit device is provided with There is an RFID chip and a lower contact point: a lock base equipped with a lower monopole antenna, which has a lock hole for the lower part of the bolt to be inserted, and is provided with a lower buckle for positioning the upper buckle to enable the The bolt can be locked on the lock seat, and further controls the electrical connection between the lower monopole antenna and the lower contact, thereby activating the RFID chip; the lower monopole antenna is composed of at least one spring, and the spring is installed on the opposite The position of the keyhole should be such that the spring not only provides pre-pressure for the electrical connection between the lower monopole antenna and the lower contact, but also further controls the spring to be sufficient to match the frequency band monitored by the customs host. The spring is controlled by its total length. Matching the frequency band monitored by the customs host, the total length defines the size of the spring when stretched in a straight line. If claim 1 is an electronic seal with a spring antenna, the total length of the spring and the frequency band of the customs host are set to one-eighth wavelength. If claim 1 or 2 is an electronic seal with a spring antenna, the spring is a compression coil spring, and the compression coil spring and the bolt are arranged on the same central axis, so that the compression coil spring is symmetrical around the bolt. Set the central axis of the piece. If claim 1 or 2 is an electronic seal with a reed antenna, the circuit device is provided with a main circuit, the main circuit is provided with a lower contact point at the bottom of the circuit device, a matching circuit at the top of the circuit device, and a matching circuit at the top of the circuit device. The lower contact point and the matching line There is a bridge line between the intermediate points, and the RFID chip has a main signal pin connected to one end of the matching line and a secondary signal pin connected to the other end of the matching line. If claim 1 or 2 has an electronic seal with a spring antenna, the circuit arrangement can be fed into the bolt so that the bolt forms an upper monopole antenna that matches the lower monopole antenna, thereby forming a dipole antenna pattern. . If claim 1 or 2 is an electronic seal with a spring antenna, the lower contact point is located in the hole, and there is a set of control areas between the bottom of the hole, and the top of the lower monopole antenna is positioned in the air. In the keyhole, when the bolt is locked on the lock base, the top of the lower monopole antenna can relatively pass through the set control area, and then be electrically connected to the lower contact point. If the electronic seal of claim item 1 or 2 has a spring-type antenna, the lower monopole antenna further has a slider that is slidably fitted to the lock seat, so that the spring links the slider, thereby controlling the slider to be suspended and positioned in the lockhole. to provide electrical connection to the lower contact.

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