CN1021165C - Magnetic material for use in burglar alarm system - Google Patents
Magnetic material for use in burglar alarm system Download PDFInfo
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- CN1021165C CN1021165C CN 89108243 CN89108243A CN1021165C CN 1021165 C CN1021165 C CN 1021165C CN 89108243 CN89108243 CN 89108243 CN 89108243 A CN89108243 A CN 89108243A CN 1021165 C CN1021165 C CN 1021165C
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- magnetic stripe
- theft protection
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Abstract
The present invention relates to a theft protection signal source material which compositely is added with one of molybdenum vanadium, molybdenum manganese, niobium nickel and chromium nickel based on ferrocobalt silicon boron to be made in a rapid quenching method, and is used for article theft protection in libraries, supermarkets, etc. Through alternating current magnetization, a magnetic bar can generate strong even harmonics which can be detected and amplified to realize alarming. The present invention also combines with a permanent magnetism magnetic bar to form a composite magnetic bar. Since a composite addition method is adopted, the present invention has the advantages of easy control of components and simple manufacture. The performance indexes of noncrystal bars are obviously superior to the magnetic bars of 3M Co. of the United States, and the present invention has replaced the magnetic bars of the 3M Co. and is used in theft protection systems in the libraries of Shenzhen and Beijing.
Description
A kind of compound magnetic stripe that is used for the burglar alarm signal source the present invention relates to the alloy field.
Before the present invention, the thief-proof magnetic stripe that Minnesota Mining and Manufacturing Company widely uses is to make with permalloy.But the sensitivity of this alloy and disguised relatively poor, and complex manufacturing technology, price is higher, and under crooked and the stress state fallen, alarm signal can obviously descend, we think that the material that is used as thief-proof magnetic stripe must have highly sensitive after deliberation, size is little, and good concealment is difficult for wrong report, high-frequency harmonic output voltage height, and want characteristics such as inexpensive.A kind of cobalt that the clear 61-261451 of Japan announces is a non-crystaline amorphous metal owing to have low iron loss, high magnetic conductivity, low saturation magnetostriction value, the characteristics of low-coercivity, thereby produced than tangible high order harmonic component amount, the output voltage values height is if as thief-proof magnetic stripe, will have good warning sensitivity so under the high-frequency work condition.But, if only adopt cobalt base amorphous alloy to make thief-proof magnetic stripe, so because the soft magnetic characteristic that presents of amorphous magnetic stripe, make its can't fill quick, disappear quick, so can only be used to open access.Books and periodicals, article can't be taken the passage of warning system out of, make to use to have brought limitation.Along with economic, cultural high development, need to realize modern management at present, commodity and books are carried out comprehensive open-shelf in market and library.So just need the magnetic sensing element that a kind of warning system is used, can fill quick, disappear quickly, promptly disappear quick to the article of doing formality, make it take passage out of and do not report to the police, the article of not going through the formalities are filled quick, carry out monitoring, make it can not take passage out of, prevent article loss, stolen.
The objective of the invention is to develop a kind of both had highly sensitive, size is little, good concealment, high-frequency harmonic output voltage height, the quick magnetic stripe that is used for the anti-theft signal source can fill again, disappear.
Measure of the present invention is to adopt the permanent magnetic material of cobalt base amorphous alloy and Fe70Cr20Co9Si to make compound magnetic stripe, because compound permanent magnetic material on cobalt base amorphous alloy, just make magnetic stripe when disappearing quick state, because of permanent-magnet alloy is magnetized, make amorphous thin ribbon be in the bigger magnetizing field, changed its ac permeability,, caused instrument alarm free signal to occur so weakened the output variable of even-order harmonic.When filling quick state, the permanent-magnet alloy in the composite tape loses magnetism, and amorphous thin ribbon presents very high permeability, in the AC and DC magnetic field of instrument channel, can produce abundant even-order harmonic, impels instrument to report to the police.
Fig. 1 is the amorphous magnetic stripe, and Fig. 2 is a schematic diagram of the present invention, and wherein 1 is cobalt base amorphous magnetic stripe, and 2 is permanent magnetism tablet.
Fig. 3 is for being the alarm system for guarding against theft that emitter and receiving system constitute by a passage, and wherein 3 is receiving system, and 4 for monitoring passage.
Compound magnetic stripe of the present invention can constitute a monitoring system with alarm system for guarding against theft, when article that (filling quick) handle magnetic stripe being housed the time through as shown in Figure 3 monitoring channel, the AC and DC magnetizing field that dispensing device produces makes the magnetic stripe magnetization, produce stronger even-order harmonic, this harmonic signal is by the wireline inspection and the amplification of receiving system, alarm signal is sent in the action of promotion alarm control circuit.Because event has good warning sensitivity under the high-frequency work condition as signal source to adopt cobalt base amorphous alloy in the present invention.The composition of cobalt base amorphous alloy is among the present invention: CoaFebXcSidBe wherein X is Cr+Wi, No+V, No+Nn, one of Nb+Ni or V+Ni, and a is 50～75(atomic percentage, down with), b is 1～6, c is 2～12, d is 7～16, e is 10～20.Combination ingredient X can adopt following ratio according to the characteristics of different-alloy:
When 1, nickeliferous, Ni:Cr(Nb, V) ratio be 3:1;
When 2, containing molybdenum, when employing (No+Nn), No:Nn=1:1, the ratio when adopting No+V is 2:1.
The AC magnetism performance example that adds alloy behind the different elements is in following table:
Performance
Uam Hca(A/N) addition element
Numbering
1 40，200 5.41 （No+V）
2 43，400 5.57 （Nn+No）
3 37，400 7.80 （Nb+Ni）
4 58，000 3.98 （Cr+Ni）
The non-crystaline amorphous metal that the present invention uses is smelted into foundry alloy in the intermediate frequency vaccum sensitive stove, making thickness with the outer garden of single roller quench is 0.03～0.04 millimeter, wide is 1.4～2.0 millimeters amorphous ribbon, we are the coated with metal adhesive on the amorphous ribbon of making, 3～5 permanent magnetism magnetic stripes (as shown in Figure 2) have been sticked then, promptly make compound magnetic stripe, this magnetic stripe is after process disappears quick processing, the safety of goods that this magnetic stripe is housed is not reported to the police by passage, the permanent magnetic material that is adopted is the Fe70Cr20Co9Si thin slice in the present invention, and it is through the multistage annealing in process of solution hardening and 650～500 ℃.It is COaFeb * cSidBe that the present invention adopts composition, wherein X is Cr+Ni, No+Nn, one of Nb+Ni or V+Ni, and a is 50～75(atomic percentage, down together) b is 1～6, c is 2～12, d is 7～16, e is the material production high-frequency harmonic output as alarm signal of 10～20 cobalt base amorphous magnetic material silver, it is characterized in that on above-mentioned amorphous magnetic silver the permanent magnetism tablet that is stained with 3～5 Fe70Cr20Co9Si with metal-to-metal adhesive makes compound magnetic stripe, make it can fill, disappear quick in use.
The present invention is through comparing result such as following table with the thief-proof magnetic stripe of Minnesota Mining and Manufacturing Company:
Performance
That the back is fallen at two meters of somascope reading is crooked＜30 ° after size (millimeter)
Material
The present invention 20 20 20 1.8 * 0.035 * 165
U.S. 3M 13.5 10.5 70 3.5 * 0.040 * 165
Magnetic stripe of the present invention as can be seen from the above table performance after crooked and fall-down test is constant, and the magnetic stripe of Minnesota Mining and Manufacturing Company also can cause the wrong report phenomenon because high-gradient magnetism is bad.And size provides much smaller than 3M company.According to test, books one admission passage that accompanies magnetic stripe of the present invention can send signal, and sensitivity is high.
Composite tape can magnetize, and makes magnetic lineation remanent magnetism, can be situated between except that the protection of system like this, makes article carry monitoring channel outside, and does not produce warning.The coercive force that records on the composite tape is 32, and the 000A/M residual induction is 0.7 tesla.
The present invention be used for the burglar alarm signal source both had highly sensitive, size is little, good concealment, high-frequency harmonic output voltage height, it is quick to fill again, disappear, and alarm signal can not descend under crooked and the stress state fallen.
Claims (1)
- A kind of compound magnetic stripe that is used for the burglar alarm signal source, it adopts composition to be: CoaFebXcSidBe wherein X is Cr+Wi, No+V, Mo+Mn, one of Wb+Wi or V+Ni, and a is 50～75 (atomic percentages, down together), b is 1～6, c is 2～12, and d is 7～16, and e is that 10～20 cobalt base amorphous magnetic material silver is as the alarm signal source material, it is characterized in that, on above-mentioned amorphous magnetic silver, be stained with 3～5 Fe70Cr20Co9Si permanent magnetism tablets and make compound magnetic stripe with metal-to-metal adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89108243 CN1021165C (en) | 1989-10-27 | 1989-10-27 | Magnetic material for use in burglar alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89108243 CN1021165C (en) | 1989-10-27 | 1989-10-27 | Magnetic material for use in burglar alarm system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1051265A CN1051265A (en) | 1991-05-08 |
| CN1021165C true CN1021165C (en) | 1993-06-09 |
Family
ID=4857498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89108243 Expired - Fee Related CN1021165C (en) | 1989-10-27 | 1989-10-27 | Magnetic material for use in burglar alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1021165C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9412456U1 (en) * | 1994-08-02 | 1994-10-27 | Vacuumschmelze Gmbh, 63450 Hanau | Amorphous alloy with high magnetostriction and at the same time high induced anisotropy |
| CN106521365A (en) * | 2016-09-29 | 2017-03-22 | 宁波讯强电子科技有限公司 | Rare earth doped non-crystalline material for acoustic magnetic label resonance piece and preparation method thereof |
| CN106893952B (en) * | 2017-03-15 | 2018-08-10 | 常州市美格耐特非晶材料有限公司 | A kind of amorphous ribbon for audio magnetic label material |
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1989
- 1989-10-27 CN CN 89108243 patent/CN1021165C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1051265A (en) | 1991-05-08 |
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