Passive resettable temperature status recording device

Abstract

A passive resettable temperature state recording device. The device is composed of a temperature monitoring device, a reset module device, an ultra-high frequency chip, an antenna and a substrate. The device mentioned in the invention is installed on the object to be monitored, and monitors whether the environmental temperature of the object exceeds the warning temperature. When the environmental temperature exceeds the warning temperature, the monitoring module device triggers the monitoring switch, and the switch state is irreversible under the condition of no external interference. The device mentioned in the invention works in the ultra-high frequency band. The monitoring device transmits the "over-limit" and "normal" signals to the ultra-high frequency chip, and then radiates the signals to the query equipment in the form of radio waves through the antenna. The device does not need power supply, and can obtain energy from the signals emitted by the query equipment, and transmit the on-off signals to the query equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of temperature measurement and control, and more particularly to a passive resettable temperature state recording device. BACKGROUND

[0002] In an era where everything needs information marking, electronic tag technology, as a product of the information age, greatly meets people's demand for information in the Internet of Things. The division of the electronic tag field is various, including low frequency, high frequency, ultra-high frequency and very high frequency, active, semi-active and passive, paper tag, card tag and hard tag, and most of the types are distinguished on the premise of application.

[0003] Ultra-high frequency electronic tags are widely used in medical safety and cold chain storage fields. Most existing electronic tags can identify, inventory and encrypt medical devices, medical supplies, cold chain materials and cold storage. When the goods are out of storage temperature for a long time, the safety and effectiveness of the goods will be a major problem, and effective traceability cannot be performed. Therefore, an electronic tag with temperature monitoring function is particularly necessary.

[0004] Most existing electronic tags have single function and only have read-write function. The passive ultra-high frequency temperature electronic tags circulating in the market all react to real-time temperature information and cannot record historical temperature information. For example, when the object to be monitored has a warning temperature requirement, the tag device cannot record the state when the temperature exceeds the limit without detection by the query device. When the query device is inventoried, only the current temperature information can be inventoried, and the temperature state change in the two inventory periods cannot be queried.

[0005] Active ultra-high frequency temperature electronic tags can power the temperature sensor module inside the chip according to the set time interval to record the temperature information value at that time. The tag cannot be used in specific fields, such as wireless control scenes and battery control scenes. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a passive resettable temperature state recording device, which is installed on the object to be monitored to monitor whether the environmental temperature of the object exceeds the warning temperature. When the environmental temperature exceeds the warning temperature, the monitoring module device triggers the monitoring switch, and the switch state is irreversible under the condition of no external interference. The device mentioned in the present application works in the ultra-high frequency band. The monitoring device transmits the "over-limit" and "normal" signals to the ultra-high frequency chip, and then transmits the signals to the query device in the form of radio waves through the antenna. The device does not need power supply and can obtain energy from the signals emitted by the query device to transmit the on-off signals to the query device.

[0007] The technical solution of the present application is as follows:

[0008] A passive resettable temperature state recording device, comprising an ultra-high frequency chip, an antenna, an antenna substrate, characterized in that it further comprises a temperature reset module and a temperature monitoring module;

[0009] The antenna comprises a first branch, a second branch, a third branch and a radiation surface, the first branch and the radiation surface are distributed on both sides of the antenna substrate, the bottom of the second branch is aligned with the inner side of the first branch, the third branch and the second branch are parallel and distributed in an inverted L shape on the antenna substrate, and the temperature reset module and the temperature monitoring module are located between the third branch and the second branch, so that they are connected; the third branch is connected with the radiation surface;

[0010] The temperature control reset module comprises a reset rod, a first metal solder leg, a second metal solder leg, a first metal spring and a second metal spring, the first metal solder leg and the first metal spring are connected by a first metal rod, and the second metal solder leg and the second metal spring are connected by a second metal rod;

[0011] The temperature control reset module comprises a temperature sensing sheet, a connecting column, a niobium-titanium alloy memory metal and a pressing column, the upper surface of the niobium-titanium alloy memory metal is connected with the temperature sensing sheet through the connecting column, and the lower surface of the niobium-titanium alloy memory metal is connected with the top of the pressing column; the niobium-titanium alloy memory metal is made of special niobium-titanium alloy material and will be deformed in a concave shape under the influence of temperature;

[0012] The first metal spring, the second metal spring, the upper part of the reset rod, the connecting column, the niobium-titanium alloy memory metal and the pressing column are packaged in a shell, the top of the reset rod is connected with the lower surface of the second metal spring, and the pressing column is located at the corresponding position of the upper surface of the second metal spring; in the reset state, the outer upper surface of the second metal spring is in contact with the outer lower surface of the first metal spring, and the temperature sensing sheet is arranged on the upper surface of the shell;

[0013] First and second through holes are formed in the antenna substrate, the first through hole is located at the third branch, and the second through hole is located at the second branch; the first metal solder leg and the second metal solder leg are respectively welded with the antenna substrate through the first and second through holes;

[0014] When the temperature sensing sheet detects that the temperature exceeds the threshold value, heat is transmitted through the connecting column, causing the niobium-titanium alloy memory metal to deform downward and concave, driving the pressing column to move downward and open the second metal spring, so that the second metal spring is separated from the first metal spring, the performance of the ultra-high frequency microstrip antenna is deteriorated, and a warning is made;

[0015] When it needs to be reset, the reset button is pressed, the reset button is displaced, the second metal spring is lifted, the second metal spring is in contact with the first metal spring, and the performance of the ultra-high frequency microstrip antenna is restored to normal.

[0016] The first metal solder leg and the second metal solder leg are both "L" shaped and symmetrically distributed on the bottom of the shell.

[0017] The reset rod is cylindrical, and the reset button is on the bottom of the second metal spring through the third through hole.

[0018] The first through hole and the second through hole are copper-coated, with a length of 5mm-10mm, a width of 1mm-2mm, and a thickness of 1mm-2mm. The distance between the first through hole and the second through hole is 10mm-20mm; the first through hole is a circle with a diameter of 2mm-4mm and a thickness of 1mm-2mm, and the hole is not copper-coated.

[0019] The ultra-high frequency microstrip antenna is in the form of etched copper, which is coated on the substrate with a thickness of 0.035mm.

[0020] The ultra-high frequency chip adopts a DFN packaging form and is soldered on the reserved pin of the ultra-high frequency microstrip antenna by SMT process.

[0021] The antenna is an ultra-high frequency microstrip antenna with a length of 50mm-60mm, a width of 30mm-40mm, and a distance of 1mm-2mm from the edge of the substrate and 1mm-2mm from the left edge.

[0022] The ultra-high frequency chip is connected to the ultra-high frequency microstrip antenna to realize data transmission of radio frequency signals and realize data communication of a passive and resettable temperature sensing label.

[0023] The first arm is composed of two rectangles connected together, with a large rectangle length of 10mm-20mm and a width of 5mm-15mm, and a small rectangle length of 5mm-15mm and a width of 1mm-5mm. The short side of the small rectangle is connected to the long side of the large rectangle, with a distance of 2mm-7mm from the bottom of the large rectangle.

[0024] The second arm is shaped like an inverted "L" shape, with a short side length of 3mm-6mm and a width of 2mm-5mm, a long side length of 4mm-10mm and a width of 2mm-8mm, and a thickness of 0.02mm. The second arm and the third arm are connected through a reset module. The third arm is shaped like an inverted "L" shape, with a short side length of 5mm-10mm and a width of 2mm-4mm, a long side length of 25mm-30mm and a width of 2mm-4mm, and a thickness of 0.02mm. The third arm is connected to the radiation surface.

[0025] The radiation surface is shaped like an inverted "U", the U-shaped right microstrip antenna arm length is 20mm-30mm, the width is 15mm-20mm, and there is a rectangular opening at a distance of 5mm-12mm from the right edge; the rectangular opening length is 8mm-15mm, and the width is 5mm-10mm.

[0026] The size and position of the rectangular opening can change the impedance matching of the ultra-high frequency microstrip antenna. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Label perspective view

[0028] Figure 2 Label front view

[0029] Figure 3 Temperature monitoring device and reset device diagram

[0030] In the figure, 100 is an ultra-high frequency chip, 200 is an antenna, 300 is a temperature reset module, 400 is a temperature monitoring module, and 500 is an antenna substrate; 201 is a first branch, 202 is a second branch, 203 is a third branch, and 204 is a radiation surface; 502 is a first through hole, and 503 is a second through hole; 301 is a reset rod, 302 is a first solder leg, 303 is a second solder leg, 304 is a first metal spring, and 305 is a second metal spring; 401 is a shell, 402 is a temperature sensing sheet, 403 is a connecting column, 404 is a niobium-titanium alloy memory metal, and 405 is a pressing column. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The passive resettable temperature state recording device of the present application works in the 860MHz-960MHz ultra-high frequency band as a passive ultra-high frequency electronic tag, with a length of 50mm-60mm, a width of 30mm-40mm, and a thickness of 1mm-2mm.

[0033] The temperature monitoring module, the temperature reset module, the ultra-high frequency chip, the antenna, and the substrate are included. The ultra-high frequency chip and the temperature reset module are welded on the reserved pins of the antenna through the SMT process.

[0034] The temperature monitoring module, when the ambient temperature changes, the temperature sensing sheet will conduct the ambient temperature to the niobium titanium alloy spring through the connecting column. According to the principle of thermal expansion and cold contraction, due to the material factor of the alloy spring, when the critical temperature value of the spring is exceeded, the spring will deform.

[0035] The niobium titanium alloy spring can adjust the mechanical parameters of the niobium titanium alloy according to the scene temperature requirements to adapt to the requirements of different warning temperature lines in different scenes. The adjustable temperature interval is 20℃-150℃.

[0036] The temperature reset module, below the warning temperature, the niobium titanium alloy spring does not deform, and the first metal spring and the second metal spring of the reset module are in contact through the contact. The first solder leg, the first metal spring, the second solder leg and the second metal spring in the reset module form a path, and feedback the set "normal" signal.

[0037] Above the warning temperature, the niobium titanium alloy spring deforms due to the influence of temperature, and the stand column is pushed out, so as to open the reset rod, causing the first metal spring and the second metal spring to be disconnected. The first solder leg, the first metal spring and the second solder leg, and the second metal spring in the reset module form an open circuit, and feedback the set "over limit" signal.

[0038] Press the reset rod, so that the pressure column is forced to deform the niobium titanium alloy memory metal. The first metal spring and the second metal spring of the reset module are in contact through the contact. The first solder leg, the first metal spring, the second solder leg and the second metal spring in the reset module form a path, and feedback the set "normal" signal.

[0039] The first metal spring and the second metal spring are made of copper nickel alloy, which can be used for a long time without being oxidized. The first solder leg and the second solder leg are stainless steel sheets, and the temperature sensing sheet is a nickel alloy.

[0040] The substrate is made of FR4 material and has flame retardance, can withstand 250° high temperature, the length is 50mm-60mm, the width is 30mm-40mm, and the thickness is 1mm-2mm; the service life is up to 10 years.

[0041] The first solder leg is welded with the second straight arm 202 of the antenna through the first through hole, and the second solder leg is welded with the third branch arm of the antenna through the second through hole. The first through hole and the second through hole are covered with copper inside, the length is 5mm-10mm, the width is 1mm-2mm, and the thickness is 1mm-2mm. The distance between the first through hole and the second through hole is 10mm-20mm; the first via hole is a circle with a diameter of 2mm-4mm and a thickness of 1mm-2mm, and the hole is not covered with copper.

[0042] In this embodiment, the antenna is a dipole antenna, with two arms of unequal length on both sides of the chip serving as antenna radiators. The antenna is an ultra-high frequency microstrip antenna, coated onto the substrate with etched copper, with a thickness of 0.035mm. It includes a first arm, a second arm, a third arm, and an antenna radiating surface. The first arm serves as the left radiating element alone. The second arm, the reset module, the third arm, and the radiating surface together form the right radiating element. The length of the antenna radiating element directly affects the antenna performance.

[0043] The first arm is composed of two connected rectangles. The larger rectangle is 10mm to 20mm long and 5mm to 15mm wide, while the smaller rectangle is 5mm to 15mm long and 1mm to 5mm wide. The shorter side of the smaller rectangle is connected to the longer side of the larger rectangle, and is located 2mm to 7mm from the bottom of the larger rectangle.

[0044] The temperature control reset module consists of a reset rod, a first metal spring, a first metal solder joint, a second metal spring, and a second metal solder joint. The temperature control reset module has a height of 10mm to 20mm and a diameter of 10mm to 20mm.

[0045] The reset rod is made of plastics such as PP polyester, PC plastic, and ABS. It is a cylinder with a diameter of 2mm to 8mm and a height of 5mm to 15mm. The reset button passes through the third through hole and rests on the bottom of the second metal spring.

[0046] The second metal spring has a length of 5mm to 15mm, a width of 1mm to 5mm, and a thickness of 0.2mm; the second metal spring and the second metal weld foot are connected by a metal rod with a diameter of 1mm to 5mm and a height of 3mm to 8mm.

[0047] The second metal solder foot is shaped like an "L", with a short side length of 1mm to 5mm, a width of 2mm to 6mm, and a thickness of 0.6mm; the long side length is 5mm to 10mm, the width is 5mm to 10mm, and the thickness is 0.6mm. The second metal solder foot is soldered to the second through hole using an SMA (Surface Mount Mass Attachment) method.

[0048] The first metal spring has a length of 5mm to 15mm, a width of 2mm to 8mm, and a thickness of 0.2mm; the first metal spring and the first metal weld foot are connected by a metal rod with a diameter of 1mm to 5mm and a height of 5mm to 10mm.

[0049] The first metal welding leg is in the shape of an ''L'', the short side is 3-8mm long, 5-10mm wide and 0.6mm thick; the long side is 5-10mm long, 5-10mm wide and 0.6mm thick.

[0050] The first metal spring plate and the second metal spring plate are in contact after reset and are separated before reset.

[0051] The antenna and the temperature reset module are part of the radiation array and participate in signal radiation. When the temperature reset module feeds back a ''normal'' signal, the right arm radiation array meets the 900M resonance length requirement, and the antenna is in the best state. At this time, the sensing distance of the device to the identification equipment reaches the farthest, more than 5m. When the temperature reset module feeds back an ''over-limit'' signal, the right arm radiation array is sharply shortened and cannot meet the 900M resonance length requirement. At this time, the sensing distance of the device to the identification equipment becomes short, only about 5cm.

[0052] The present application obtains energy from the radio waves emitted by the query device without the aid of a power source, converts the energy into energy for the operation of the tag chip, and reversely transmits the information stored in the chip to the query device.

[0053] The niobium-titanium alloy memory metal is a special niobium-titanium alloy material in the form of a round sheet with a diameter of 10-20mm and a thickness of 0.1mm, which is easy to deform when affected by temperature.

[0054] The reset rod is made of PP polyester material and has a diameter of 1-5mm and a height of 4-10mm.

[0055] When the temperature exceeds the threshold value, the niobium-titanium alloy memory metal round sheet is recessed by 1-5mm, the reset rod is moved downward by 1-5mm, the reset rod pushes open the top of the second metal spring plate, and finally the second metal spring plate is separated from the first metal spring plate, so that the performance of the ultra-high frequency microstrip antenna is deteriorated, and a warning behavior can be made.

[0056] When reset is needed, the reset button is pressed, the reset button is displaced, the bottom of the second metal spring plate is pushed open, and finally the second metal spring plate is in contact with the first metal spring plate, so that the performance of the ultra-high frequency microstrip antenna is restored to normal.

[0057] The existence of the niobium-titanium alloy memory metal, the first metal spring plate and the second metal spring plate is equivalent to a temperature switch, and in the passive state, the reset rod and the reset button can play the role of switch reset.

Claims

1. A passive repositionable temperature status recording device comprising an ultra-high frequency chip (100), an antenna (200), an antenna substrate (500) and an interrogation device, characterized in that, Further comprising a temperature reset module (300) and a temperature monitoring module (400); The antenna (200) comprises a first branch (201), a second branch (202), a third branch (203) and a radiation surface (204), the first branch (201) and the radiation surface (204) are distributed on both sides of the antenna substrate (500), the bottom of the second branch (202) is aligned with the inner side of the first branch (201), the third branch (203) is parallel to the second branch (202) and is distributed on the antenna substrate in an inverted L shape, and the temperature reset module (300) and the temperature monitoring module (400) are located between the third branch (203) and the second branch (202) to connect them; the third branch (203) is connected with the radiation surface (204); The temperature reset module comprises a reset rod (301), a first metal welding leg (302), a second metal welding leg (303), a first metal spring (304) and a second metal spring (305), the first metal welding leg (302) is connected with the first metal spring (304) through a first metal rod, and the second metal welding leg (303) is connected with the second metal spring (305) through a second metal rod; The temperature monitoring module comprises a temperature sensing sheet (402), a connecting column (403), a niobium-titanium alloy memory metal (404) and a pressing column (405), the upper surface of the niobium-titanium alloy memory metal (404) is connected with the temperature sensing sheet (402) through the connecting column (403), and the lower surface of the niobium-titanium alloy memory metal (404) is connected with the top of the pressing column (405); the niobium-titanium alloy memory metal is made of special niobium-titanium alloy material and will be deformed in a concave shape under the influence of temperature; The first metal spring (304), the second metal spring (305), the upper part of the reset rod (301), the connecting column (403), the niobium-titanium alloy memory metal (404) and the pressing column (405) are encapsulated in a shell (401), the top of the reset rod (301) is connected with the lower surface of the second metal spring (305), and the pressing column (405) is located at the corresponding position of the upper surface of the second metal spring (305); in the reset state, the outer upper surface of the second metal spring (305) is in contact with the outer lower surface of the first metal spring (304), and the temperature sensing sheet (402) is arranged on the upper surface of the shell (401); First and second through holes (502 and 503) are formed in the antenna substrate (500), the first through hole (502) is located at the third branch (203), and the second through hole (503) is located at the second branch (202); the first metal welding leg (302) and the second metal welding leg (303) are respectively welded with the antenna substrate (500) through the first through hole (502) and the second through hole (503). When the temperature sensing sheet (402) detects that the temperature exceeds the threshold, heat is transferred through the connecting column (403), causing the niobium-titanium alloy memory metal (404) to deform downward, driving the pressure column (405) to move downward, lifting the second metal spring (305), and separating the second metal spring (305) from the first metal spring (304), which degrades the performance of the antenna (200) and continuously outputs an "over-limit" signal to the querying device in the form of radio waves, indicating a warning; When resetting is needed, the reset rod (301) is pressed, which is displaced, lifting the second metal spring (305) and making it contact the first metal spring (304), restoring the performance of the antenna (200) and outputting a "normal" signal to the querying device in the form of radio waves. The first metal solder leg (302) and the second metal solder leg (303) are both "L" shaped and symmetrically distributed on the bottom of the shell (401); the reset rod (301) is cylindrical, and the upper end of the reset rod (301) penetrates into the shell (401) and reaches the bottom of the second metal spring (305).

2. The passive, resettable temperature status recording device of claim 1, wherein, The first through hole and the second through hole are copper-coated, with a length of 5-10 mm, a width of 1-2 mm, and a thickness of 1-2 mm; the first through hole and the second through hole are spaced 10-20 mm apart; the first through hole is a circle with a diameter of 2-4 mm and a thickness of 1-2 mm, and is not copper-coated.

3. The passive, resettable temperature status recording device of claim 1, wherein, The antenna is etched copper, which is coated on the antenna substrate with a thickness of 0.035 mm.

4. The passive repositionable temperature indicating recording device of claim 1, wherein, The ultra-high frequency chip adopts a DFN packaging form and is soldered on the antenna reserved pin using the SMT process.

5. The passive, resettable temperature status recording device of claim 4, wherein, The antenna (200) is an ultra-high frequency microstrip antenna, with a length of 50-60 mm, a width of 30-40 mm, and a distance of 1-2 mm from the edge of the antenna substrate and 1-2 mm from the left edge.

6. The passive repositionable temperature indicating recording device of claim 1, wherein, The ultra-high frequency chip (100) is connected to the antenna to realize data transmission of radio frequency signals and data communication of a passive and resettable temperature sensing label.

7. The passive repositionable temperature indicating recording device of claim 1, wherein, The first arm is composed of two rectangles connected together, with a large rectangle having a length of 10-20 mm and a width of 5-15 mm, and a small rectangle having a length of 5-15 mm and a width of 1-5 mm, the short side of the small rectangle being connected to the long side of the large rectangle at a distance of 2-7 mm from the bottom of the large rectangle.

8. The passive repositionable temperature indicating recording device of claim 1, wherein The second arm is shaped like an inverted "L", with a short side length of 3-6 mm, a width of 2-5 mm, a long side length of 4-10 mm, a width of 2-8 mm, and a thickness of 0.02 mm; the second arm and the third arm are connected through a reset module; the third arm is shaped like an inverted "L", with a short side length of 5-10 mm, a width of 2-4 mm, a long side length of 25-30 mm, a width of 2-4 mm, and a thickness of 0.02 mm, and is connected to the radiation surface.

9. The passive repositionable temperature indicating recording device of claim 1 wherein The radiation surface is shaped like an inverted "U", the U-shaped right microstrip antenna arm has a length of 20mm-30mm and a width of 15mm-20mm, and a rectangular opening is arranged at a distance of 5mm-12mm from the right edge; the rectangular opening has a length of 8mm-15mm and a width of 5mm-10mm.

10. The passive repositionable temperature indicating recording device of claim 9, wherein The size and position of the rectangular opening can change the impedance matching of the ultra-high frequency microstrip antenna.

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