CN109326046B - Universal encryption magnetic head module - Google Patents
Universal encryption magnetic head module Download PDFInfo
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- CN109326046B CN109326046B CN201710637723.6A CN201710637723A CN109326046B CN 109326046 B CN109326046 B CN 109326046B CN 201710637723 A CN201710637723 A CN 201710637723A CN 109326046 B CN109326046 B CN 109326046B
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
- G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
- G07F7/10—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means together with a coded signal, e.g. in the form of personal identification information, like personal identification number [PIN] or biometric data
- G07F7/1016—Devices or methods for securing the PIN and other transaction-data, e.g. by encryption
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10257—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for protecting the interrogation against piracy attacks
- G06K7/10267—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for protecting the interrogation against piracy attacks the arrangement comprising a circuit inside of the interrogation device
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- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
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- Computer Security & Cryptography (AREA)
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- Magnetic Heads (AREA)
Abstract
The application discloses general encryption magnetic head module, including the stereoplasm circuit board, set up on the stereoplasm circuit board: the card swiping system comprises an information transmission circuit, a magnetic head chip, a safety chip and a main control equipment interface for connecting external card swiping main control equipment, wherein the information transmission circuit is used for providing an information transmission channel among the safety chip, the magnetic head chip and the main control equipment; the magnetic head chip is used for converting the magnetic stripe card information into a digital signal and sending the digital signal to the safety chip; the security chip is in lead bonding with the information transmission circuit in a bare chip mode and is used for receiving the magnetic stripe card information and encrypting the magnetic stripe card information. The technical scheme uses modular design thinking, adopts the hard PCB to realize the connection of each module, is connected with the card swiping machine through the cable, can be compatible with various main control equipment such as the card swiping machine only by changing the cable, and reduces the cost consumed by the whole magnetic head module while ensuring higher safety of user information and enhancing the compatibility of the encrypted magnetic head.
Description
Technical Field
The invention belongs to the field of information security, and particularly relates to a universal encryption magnetic head module.
Background
With the development of the payment industry and the improvement of security awareness of people, more and more card swiping devices are required to have higher security attributes, which requires that the card swiping head of the POS machine must be an encryption head. When the original unencrypted magnetic head is used for swiping a card, information of a user magnetic stripe card can be directly transmitted in a system in a plaintext form, so that great hidden danger is caused, and if the encrypted magnetic head with a built-in safety chip is used, sensitive information can be effectively protected from being leaked.
The encryption magnetic head with the built-in safety chip has larger cost due to the addition of the safety chip, and the higher cost magnetic head has obvious insufficient competitiveness in the POS machine market with increasingly severe competition. In addition, POS machines in the market are various in manufacturers and models, different in connection parts and difficult to have a general solution, so that the encryption magnetic head has high compatibility and can be integrated on different POS machine main control devices. Therefore, how to enhance the compatibility of the encrypted magnetic head while ensuring higher security of the user information and reducing the cost consumed by the whole magnetic head module becomes a technical problem to be solved by the present invention.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a universal encryption magnetic head module.
In order to solve the technical problems, the invention adopts the technical scheme that:
including the stereoplasm circuit board, set up on the stereoplasm circuit board:
the card swiping system comprises an information transmission circuit, a magnetic head chip, a safety chip and a main control equipment interface for connecting external card swiping main control equipment, wherein the information transmission circuit is used for providing an information transmission channel among the safety chip, the magnetic head chip and the main control equipment;
the magnetic head chip is used for converting the read magnetic stripe card information into a digital signal and sending the digital signal to the security chip;
the security chip is in lead bonding with the information transmission circuit in a bare chip mode and is used for receiving the magnetic stripe card information and encrypting the magnetic stripe card information.
Further, the information transmission circuit comprises a first transmission circuit, and the magnetic head chip performs information transmission through wire bonding with the first transmission circuit and the security chip;
the information transmission circuit further comprises a second transmission circuit, and the safety chip is connected with the interface of the main control equipment through lead bonding with the second transmission circuit and is used for information transmission between the safety chip and the main control equipment.
Furthermore, the first transmission circuit comprises a first transmission channel and a second transmission channel, wherein the first transmission channel is in lead bonding with the security chip and the magnetic head chip and provides a transmission channel for magnetic stripe card information between the security chip and the magnetic head chip; and the second transmission channel is in lead bonding with the safety chip and the magnetic head chip and provides a transmission channel of a gating signal of the safety chip.
Furthermore, the main control device comprises a plurality of interfaces, the security chip comprises a pin corresponding to the main control device interface, the second transmission circuit comprises a plurality of transmission channels connecting the security chip and the main control device interface, one end of each transmission channel is in lead bonding with the security chip, and the other end of each transmission channel is connected with the main control device interface.
Further, the secure chip includes: a first general pin, a second general pin, a CS pin, a MOSI pin, a CLK pin, and a MISO pin; the main control equipment interface comprises interfaces correspondingly connected with the pins of the safety chip, and the interfaces are sequentially as follows: the system comprises a first general interface, a second general interface, a CS interface, an MOSI interface, a CLK interface and a MISO interface;
the second transmission circuit includes: the first general transmission channel is bonded with the first general pin and the first general interface lead; the second universal transmission channel is in lead bonding with the second universal pin and the second universal interface; the third transmission channel is bonded with the MOSI pin and the MOSI interface lead; the fourth transmission channel is bonded with the MISO pin and the MISO interface lead; the fifth transmission channel is bonded with the CS pin and the CS interface lead; and the sixth transmission channel is in wire bonding with the CLK pin and the CLK interface.
Furthermore, the main control device is connected with a corresponding interface of the main control device through a cable.
Further, a magnetic head chip interface is further arranged on the hard circuit board, the magnetic head is connected with the magnetic head chip through the magnetic head chip interface, and the magnetic head is a three-rail magnetic head.
Further, the magnetic head chip can be replaced by an analog circuit with the same function as the magnetic head chip, and the analog circuit receives the magnetic stripe card information and converts the information into a digital signal.
Compared with the prior art, the scheme has the following advantages:
the encryption magnetic head module is realized through the hard circuit board by using modular design thinking, the encryption magnetic head module is connected with main control devices such as POS machines and the like through cables, and various main control devices such as POS machines and the like can be compatible only by changing the cables, so that the encryption magnetic head module has higher compatibility compared with the traditional encryption magnetic head, is convenient for large-scale production and stock, and can effectively reduce the production cost;
the hard circuit board is used for replacing the traditional FPC flexible PCB, the hardware manufacturing cost can be greatly reduced, and meanwhile, the hard circuit board has better wear resistance and reliability and longer service life than the traditional FPC flexible PCB;
the wire bonding technology is used in the combination mode of the safety chip and the hard circuit board, so that compared with the traditional process, the primary packaging of the safety chip is saved, the system integration level is improved, and the cost of the whole magnetic head module can be greatly reduced;
further, when the information reading module adopts a magnetic head chip, the magnetic head chip and the hard circuit board also adopt a wire bonding technology, so that the manufacturing cost of the magnetic head is further reduced.
In summary, the present application adopts various design ideas and technologies, which can effectively reduce the production and operation costs of the current encryption magnetic head, and has higher advancement compared with the mainstream scheme in the current market.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a head arrangement in one embodiment;
FIG. 2 is a flow chart of a complete card swipe;
FIG. 3 is a waveform diagram of data signals on a data bus under the SPI protocol;
FIG. 4 is a cross-sectional view of an embodiment of an encryption head;
FIG. 5 is a schematic diagram of wire bonding of the security chip, the magnetic head chip and the PCB.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
A general cryptographic head module comprises a hard circuit board, wherein the hard circuit board is provided with:
the card swiping system comprises an information transmission circuit, a security chip U1, a magnetic head chip U2 and a main control equipment interface for connecting external card swiping main control equipment, wherein the information transmission circuit is used for providing an information transmission channel between the security chip and the magnetic head chip as well as between the security chip and the main control equipment;
the magnetic head chip is used for converting the read magnetic stripe card information into a digital signal and sending the digital signal to the security chip;
the security chip is in lead bonding with the information transmission circuit in a bare chip mode and is used for receiving the magnetic stripe card information and encrypting the magnetic stripe card information.
As shown in fig. 1, in a general encrypted magnetic head module, a circuit board is provided with a security chip and an auxiliary circuit for the security chip to work, a magnetic head chip and an information transmission circuit, wherein the information transmission circuit includes a first transmission circuit;
the magnetic head chip is in lead bonding with the first transmission channel and performs information transmission with the safety chip;
the information transmission circuit further comprises a second transmission circuit, and the safety chip is connected with the interface of the main control equipment through lead bonding with the second transmission circuit and is used for information transmission between the safety chip and the main control equipment.
The interface of the main control equipment is set as an interface welding disc, and corresponding pins are led out through welding of cables and connected to the main control equipment.
The auxiliary circuit is arranged on the hard circuit board and comprises a power supply circuit, a crystal oscillator circuit and the like, and the safety chip is in lead bonding with the auxiliary circuit or is connected with the auxiliary circuit by SMT welding.
The first transmission circuit comprises a first transmission channel and a second transmission channel, and the first transmission channel is in lead bonding with the security chip and the magnetic head chip and provides a transmission channel of magnetic stripe card information between the security chip and the magnetic head chip; and the second transmission channel is in lead bonding with the safety chip and the magnetic head chip and provides a transmission channel of a gating signal of the safety chip.
Further, the magnetic head chip comprises a first data pin and a first data strobe pin, the security chip comprises a second data pin and a second data strobe pin, the first transmission circuit comprises a first transmission circuit and a second transmission circuit, and the first transmission circuit is in wire bonding with the first data pin and the second data pin and is communicated with the first data pin and the second data pin; the second transmission circuit is in wire bonding with the first data strobe pin and the second data strobe pin and is communicated with the first data strobe pin and the second data strobe pin.
In one embodiment, the first transmission channel and the second transmission channel of the first transmission circuit are disposed on the hard circuit board, and are wire-bonded to the security chip or the magnetic head chip by gold wire, alloy wire, aluminum wire, etc., without being limited to a certain material, so as to perform the function of transmitting electronic signals.
The main control equipment comprises a plurality of interfaces, the safety chip comprises a pin corresponding to the main control equipment interface, the second transmission circuit comprises a plurality of transmission channels for connecting the safety chip and the main control equipment interface, one end of each transmission channel is in lead bonding with the safety chip, and the other end of each transmission channel is connected with the main control equipment interface.
Further, the secure chip includes: a first general pin, a second general pin, a CS pin, a MOSI pin, a CLK pin, and a MISO pin; the first universal pin and the second universal pin are spare pins for realizing the universal function setting of the encryption magnetic head on the card swiping machines of various types and classes.
In an embodiment, the first general pin may be used to perform handshake with a main control device, for example, when IO is high level in normal, when a card swiping operation is completed and data encryption processing of the security chip is completed, the security chip may change the IO to low level, and when the main control device detects that IO becomes low, data reading may be performed through the main control device interface.
The second universal pin is spare, and different handshake protocols can be set according to different main control equipment.
The MOSI pin is a host output, the slave input pin and the MISO pin are host inputs, the slave output pin and the CS pin are chip selection signal pins, the CLK pin is a clock signal pin, the data format read by each pin is set according to the requirement, and the data format is not limited.
In one embodiment, the DATA communication adopts SPI protocol, which is fixed fig. 3, but the DATA format can be defined by the master device, and the common APDU command format is CLA + INS + P1+ P2+ Lc \ Le + DATA. Wherein CLA is an instruction class; INS is an instruction code; p1 and P2 are parameters; lc is the length of Data; le is the number of bytes of data that are answered when a response is desired, and 0 is the maximum possible length. Each parameter can be set according to the requirement.
The interface of the main control equipment comprises an interface correspondingly connected with the pins, and the interface comprises the following components in sequence: the system comprises a first universal interface, a second universal interface, an MOSI interface, a MISO interface, a CS interface and a CLK interface;
the second transmission circuit includes: the first general transmission channel is bonded with the first general pin and the first general interface lead; the second universal transmission channel is in lead bonding with the second universal pin and the second universal interface; the third transmission channel is bonded with the MOSI pin and the MOSI interface lead; the fourth transmission channel is bonded with the MISO pin and the MISO interface lead; the fifth transmission channel is bonded with the CS pin and the CS interface lead; and the sixth transmission channel is in wire bonding with the CLK pin and the CLK interface.
And the first general transmission channel, the second general transmission channel, the third transmission channel, the fourth transmission channel, the fifth transmission channel and the sixth transmission channel of the second transmission circuit are respectively circuits arranged on the hard circuit board.
The hard circuit board is further provided with a magnetic head chip interface, the magnetic head is connected with the magnetic head chip through the magnetic head chip interface, in one embodiment, the magnetic head is a three-track magnetic head and used for reading information of the magnetic stripe card, and the magnetic head chip interface is an interface pin.
The three-rail magnetic head can read a three-rail magnetic strip card, the compatibility of the three-rail magnetic strip card is higher than that of a double-rail magnetic head, the read data information amount is larger, and the general performance of the magnetic head is further improved.
In one embodiment, the magnetic head chip can be replaced by an analog circuit of the magnetic head chip, and the analog circuit is arranged on the hard circuit board, receives the magnetic stripe card information and converts the information into a digital signal.
The interface pins and the interface pads are respectively connected with the shell of the magnetic head and the POS machine, so that the whole functions of card swiping and encryption of the encryption magnetic head are realized, and the data transmission flow of one-time complete card swiping is shown in figure 2.
During data transmission, it is essential to perform key management and negotiation, i.e. initialization, and the operation can be customized according to the application, such as the format of the read data, the length of the read data, the encryption algorithm used, and the like.
In one embodiment, the interface of the main control device adopts an SPI interface, and an SPI protocol is used, which is simple, convenient to use, fast in communication rate, and good in compatibility, and the signal waveform on the data bus is as shown in fig. 3. The master control equipment interface adopts a handshaking mechanism of an SPI protocol, so that the encryption magnetic head has higher stability during data transmission, the efficiency is improved, no packet is lost, and meanwhile, the master control equipment resources are occupied as little as possible.
In one embodiment, the interface may also use interfaces of other protocols according to different needs, such as: IIC interface, UART interface, and 7816 interface.
In an embodiment, according to the shell structure of the magnetic head, the interface pin position on the hard circuit board is determined, the encrypted magnetic head module is connected with the magnetic head shell by welding the copper column Cu1 with the via hole at the corresponding position of the hard PCB1 board, that is, the encrypted magnetic head module is assembled inside the magnetic head shell, the pin of the related function of the security chip is led out in the form of the welding Cable1 and can be connected to the main control equipment such as a POS machine, and finally the encrypted magnetic head module is fixed in the shell by the glue injection technology below the hard PCB1 board to form the final encrypted magnetic head product, such as the cross-sectional view of the universal encrypted magnetic head module shown in fig. 4.
According to the scheme, the connection mode of the encrypted magnetic head module and the main control equipment such as the POS machine is that the encrypted magnetic head module is connected through the cable, the cable can be any cable or FPC (flexible printed circuit) line, when the encrypted magnetic head module is compatible with various different POS machines on the market, only the line sequence or the length and the shape of the cable part are required to be changed, the confidential magnetic head module does not need to be manufactured again, the sample printing and debugging are carried out again, the mold opening production is carried out again, the production and operation cost can be greatly reduced, and the problems of mold opening and sample printing, different types.
In one embodiment, the security chip and the magnetic head chip are both wired, as shown in fig. 5, that is, the wire bonding technology uses the bare chip of the security chip, also called wafer (die), and the package substrate (rigid PCB) to connect the circuit; the safety chip is bonded on the PCB1 board through a group of gold wires Au1, the magnetic head chip is bonded on the PCB1 board through a group of gold wires Au2, and after bonding is completed, the connecting wires are fixed through filling plastic package materials, so that the connecting wires are isolated from the outside and are prevented from being damaged easily.
The manufacturing of the encrypted magnetic head module is completed by combining the setting principle of each module of the magnetic head with the manufacturing process, the module standardization work of the magnetic head is realized, can be compatible with various encryption magnetic heads, the core technology in the scheme is to use a wire bonding process technology, instead of the conventional Surface Mounted Technology (SMT), the chip is directly packaged on the substrate, and the conventional SMT is bonded to the substrate by using a packaging sheet, so that the cost of primary packaging of the chip is greatly saved, the process is simplified, can effectively reduce the production cost, and the inner structure and the circuit of the encryption module are not easy to be invaded and monitored by fixing the plastic package material of the core function part, and the safety of the encryption magnetic head can be effectively improved compared with the traditional technology, the method and the device ensure higher safety of user information, enhance compatibility of the encryption magnetic head and reduce cost consumed by the whole magnetic head module.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A general cryptographic magnetic head module is characterized by comprising a hard circuit board, wherein the hard circuit board is provided with:
the card swiping system comprises an information transmission circuit, a magnetic head chip, a safety chip and a main control equipment interface for connecting external card swiping main control equipment, wherein the information transmission circuit is used for providing an information transmission channel among the safety chip, the magnetic head chip and the main control equipment;
the magnetic head chip is used for converting the magnetic stripe card information into a digital signal and sending the digital signal to the safety chip;
the security chip is in lead bonding with the information transmission circuit in a bare chip form and is used for receiving the information of the magnetic stripe card and encrypting the information of the magnetic stripe card;
the information transmission circuit comprises a first transmission circuit, and the magnetic head chip is in wire bonding with the first transmission circuit and performs information transmission with the security chip; the information transmission circuit also comprises a second transmission circuit, and the safety chip is connected with the interface of the main control equipment through lead bonding with the second transmission circuit and is used for information transmission between the safety chip and the main control equipment;
the first transmission circuit comprises a first transmission channel and a second transmission channel, and the first transmission channel is in lead bonding with the security chip and the magnetic head chip and provides a transmission channel of magnetic stripe card information between the security chip and the magnetic head chip; the second transmission channel is in lead bonding with the safety chip and the magnetic head chip and provides a transmission channel of a safety chip gating signal;
the safety chip and the magnetic head chip are respectively bonded on the hard circuit board through a group of gold wires, and the connecting wires are fixed through filling plastic package materials after bonding is completed.
2. The generic magnetic head module of claim 1, wherein the host device comprises a plurality of interfaces, the security chip comprises pins corresponding to the interfaces of the host device, the second transmission circuit comprises a plurality of transmission channels connecting the security chip and the interfaces of the host device, and each transmission channel has one end connected to the security chip and one end connected to the interfaces of the host device.
3. A generic cryptographic head module as in claim 2, wherein the security chip comprises: a first general pin, a second general pin, a CS pin, a MOSI pin, a CLK pin, and a MISO pin; the main control equipment interface comprises interfaces correspondingly connected with the pins of the safety chip, and the interfaces are sequentially as follows: the system comprises a first general interface, a second general interface, a CS interface, an MOSI interface, a CLK interface and a MISO interface;
the second transmission circuit includes: the first general transmission channel is bonded with the first general pin and the first general interface lead; the second universal transmission channel is in lead bonding with the second universal pin and the second universal interface; the third transmission channel is bonded with the MOSI pin and the MOSI interface lead; the fourth transmission channel is bonded with the MISO pin and the MISO interface lead; the fifth transmission channel is bonded with the CS pin and the CS interface lead; and the sixth transmission channel is in wire bonding with the CLK pin and the CLK interface.
4. The generic cryptographic head module of claim 1, wherein the host device is connected to the host device via a cable.
5. The magnetic head module as claimed in claim 1, wherein the hard circuit board further comprises a head chip interface, the magnetic head is connected to the head chip via the head chip interface, and the magnetic head is a three-track magnetic head.
6. A generic cryptographic head module as in claim 1, wherein the head chip is replaced by an analog circuit having the same function as the head chip, the analog circuit receiving the magnetic stripe card information and converting the information to a digital signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710637723.6A CN109326046B (en) | 2017-07-31 | 2017-07-31 | Universal encryption magnetic head module |
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| CN201710637723.6A CN109326046B (en) | 2017-07-31 | 2017-07-31 | Universal encryption magnetic head module |
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| CN109326046A CN109326046A (en) | 2019-02-12 |
| CN109326046B true CN109326046B (en) | 2021-04-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1393852A (en) * | 2001-07-02 | 2003-01-29 | 阿尔卑斯电气株式会社 | Magnetic head with IC bare chip between height limiting plate and cantilever enclosed with resin and its mfg. method |
| CN103489835A (en) * | 2013-08-27 | 2014-01-01 | 北京华大信安科技有限公司 | Security chip and packing method |
| CN103974528A (en) * | 2013-01-29 | 2014-08-06 | 联想(北京)有限公司 | Packaging technology, PCB, control method and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593086A (en) * | 2009-04-08 | 2009-12-02 | 洪炜栋 | A kind of digital magnetic head of magnetic card reader and control mode thereof |
| CN202041965U (en) * | 2011-04-25 | 2011-11-16 | 深圳市健马科技开发有限公司 | Swiping card magnetic head special for peripheral component interconnect (PCI) 3.0 |
| CN203573322U (en) * | 2013-10-08 | 2014-04-30 | 飞天诚信科技股份有限公司 | Encrypted magnetic head |
| CN204009927U (en) * | 2014-08-18 | 2014-12-10 | 兆讯恒达微电子技术(北京)有限公司 | A kind of safety encipher magnetic head |
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2017
- 2017-07-31 CN CN201710637723.6A patent/CN109326046B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393852A (en) * | 2001-07-02 | 2003-01-29 | 阿尔卑斯电气株式会社 | Magnetic head with IC bare chip between height limiting plate and cantilever enclosed with resin and its mfg. method |
| CN103974528A (en) * | 2013-01-29 | 2014-08-06 | 联想(北京)有限公司 | Packaging technology, PCB, control method and electronic device |
| CN103489835A (en) * | 2013-08-27 | 2014-01-01 | 北京华大信安科技有限公司 | Security chip and packing method |
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