CN103942890B - The EPP keyboard that a kind of security performance is good - Google Patents
The EPP keyboard that a kind of security performance is good Download PDFInfo
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- CN103942890B CN103942890B CN201410031257.3A CN201410031257A CN103942890B CN 103942890 B CN103942890 B CN 103942890B CN 201410031257 A CN201410031257 A CN 201410031257A CN 103942890 B CN103942890 B CN 103942890B
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Abstract
The invention discloses the EPP keyboard that a kind of security performance is good, comprise the key panel set gradually from front to back, the framework comprising several button limitting casings, metal key-press, plastic spacer, keyboard board, keyboard sensing plate, core circuit plate, core over cap and the keyboard bonnet identical with button limitting casing quantity; Each metal key-press lays respectively in each button limitting casing; key panel is connected with keyboard board with framework, plastic spacer successively; keyboard sensing plate is connected with core circuit plate, core over cap successively, and keyboard bonnet covers core over cap and is connected with keyboard board with plastic spacer.The present invention has that to disassemble difficulty large, and anti-attack ability is strong, and data security is good; Reduce the risk that cardholder information is revealed and property is impaired, guarantee the feature that in cardholder account, debt is not easily stolen.
Description
Technical field
The present invention relates to ATM (automatic teller machine) (ATM) technical field of safety protection, especially relating to one, to resist external attack ability strong, the EPP keyboard that the security performance that the Transaction Information of EPP keyboard is not easily stolen is good.
Background technology
EPP keyboard is the user data input equipment of the holder be installed in ATM, needs to input PIN code when holder uses ATM to conclude the business, and EPP keyboard is given backstage after being encrypted PIN code and verified.
At present, the attack means of EPP keyboard is mainly: at the button place of the key panel of EPP keyboard, BUG circuit is installed, when holder is by EPP input through keyboard PIN code, the plaintext of BUG circuit record PIN code; Thus steal the Transaction Information of EPP keyboard.
Therefore, at present in the urgent need to developing the good EPP keyboard of a kind of security performance, thus ensure that the PIN of holder is not obtained by lawless person, the protection personal information of holder and the safety of account.
Chinese patent mandate publication number: CN201237811Y, authorize publication date on May 13rd, 2009, disclose a kind of reinforced ATM keyboard, comprise key panel, be arranged on the circuit board below key panel, the screw closely fix key panel and circuit board and nut, the position that described key panel is fixedly mounted with screw is embedded with reinforcement.The weak point of this utility model is, resists external attack ability more weak, and the Transaction Information of EPP keyboard is easily stolen.
Summary of the invention
Goal of the invention of the present invention is to overcome EPP keypad security poor-performing of the prior art, the deficiency that the Transaction Information of EPP keyboard is easily stolen, providing one, to resist external attack ability strong, the EPP keyboard that the security performance that the Transaction Information of EPP keyboard is not easily stolen is good.
To achieve these goals, the present invention is by the following technical solutions:
The EPP keyboard that security performance is good, comprises the key panel set gradually from front to back, the framework comprising several button limitting casings, metal key-press, plastic spacer, keyboard board, keyboard sensing plate, core circuit plate, core over cap and the keyboard bonnet identical with button limitting casing quantity; Each metal key-press lays respectively in each button limitting casing, key panel is connected with keyboard board with framework, plastic spacer successively, keyboard sensing plate is connected with core circuit plate, core over cap successively, and keyboard bonnet covers core over cap and is connected with keyboard board with plastic spacer;
Described plastic spacer is provided with several projections matched with each metal key-press, and position corresponding with each projection on keyboard board is equipped with through hole; Be provided with several sensors of the spacing for detecting metal key-press and keyboard sensing plate in the position corresponding with each projection of keyboard sensing plate, the quantity of sensor is identical with the quantity of projection; Core circuit plate is provided with safety governor and sensing controler; Each sensor is electrically connected with sensing controler, and sensing controler is electrically connected with safety governor.
Sensor of the present invention can detect the spacing of metal key-press and keyboard sensing plate, if someone wants to install BUG circuit at the metal key-press circuit place on keyboard mainboard surface, need each assembly first disassembling EPP keyboard, but, the spacing of metal key-press and keyboard sensing plate can be caused in the process disassembled not normal, safety governor obtains apart from after not normal signal, can automatically control the program be stored in controller and data to delete, thus ensure that the security of the data in EPP keyboard.
Therefore, the present invention has that to resist external attack ability strong, and the Transaction Information of EPP keyboard is not easily stolen, and reduces the risk that cardholder information is revealed and property is impaired, guarantees the feature that in cardholder account, debt is not easily stolen.
As preferably, described keyboard sensing plate lower surface is provided with M printed contact, M >=2, core circuit plate upper surface is provided with M the printed contact matched with each printed contact of keyboard sensing plate respectively, conductive rubber block is provided with between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, M printed contact on keyboard sensing plate is electrically connected by printed conductor, M printed contact on core circuit plate is electrically connected with the intrusion detection circuit be located on core circuit plate respectively, and intrusion detection circuit is electrically connected with safety governor.
Conductive rubber block makes pad corresponding in the printed contact on keyboard sensing plate and the printed contact on core circuit plate form electrical connection under the squeezing action of keyboard sensing plate and core circuit plate; If someone wants to install BUG circuit at the key circuit place on keyboard board surface, need each assembly first disassembling EPP keyboard, but, the pressure that conductive rubber block upper and lower surface can be caused in the process disassembled to be subject to is lost, and cause the electrical connection of the conductive rubber pad corresponding with the printed contact on the printed contact on keyboard sensing plate and core circuit plate to disconnect further, after safety governor detects that circuit disconnects, automatically the program be stored in controller and data can be controlled to delete, thus ensure that the security of the data in EPP keyboard.
As preferably, described plastic spacer top surface edge is provided with 2 elastic bumps, and the keyboard sensing plate corresponding with 2 elastic bumps is provided with conductive coating; The plastic spacer at elastic bumps place and ATM squeeze flow, safety governor is electrically connected with conductive coating and the USB interface be located on keyboard mainboard respectively.
ATM keyboard installation place back side of panel comprises 4 studs, and 4 studs are connected with clamp nut through after plastic spacer, keyboard board successively, exposed plastic spacer outside key panel and the tight pressing of ATM panel.
This mounting means can only make EPP key panel out exposed, adds the difficulty that outside violence is disassembled.
In normal state, together with plastic spacer is closely pressed together on ATM panel, elastic bumps can extrude conductive coating, thus conductive coating is electrically connected with safety governor, when needing each assembly normally disassembling EPP keyboard, by USB interface to safety governor input of control commands, the electrical connection of conductive coating and safety governor disconnects, and safety governor also can not the self-destruction program of start-up routine and data;
But, if not by USB interface to safety governor input of control commands, the electrical connection of conductive coating and safety governor disconnects; Then safety governor is thought to have received outside attack, then automatically control the program be stored in controller and data to delete, thus ensure that the security of the data in EPP keyboard.
As preferably, described keyboard sensing plate and core circuit plate all also comprise cable connector, the cable connector of keyboard sensing plate and the cable connector of core circuit plate are electrically connected by signal cable, cable connector on keyboard sensing plate is connected with each sensor electrical, and the cable connector on core circuit plate is electrically connected with sensing controler.
As preferably, described keyboard sensing plate is six layers of printed circuit board, comprises insulating top layer, bottom and the first middle layer from top to bottom arranged, the second middle layer, the 3rd middle layer, the 4th middle layer; Described sensor comprises the protective ring be printed on the first middle layer, be printed on sensing dish in protective ring and be printed on circular protective plate in the second middle layer and corresponding with protective ring, sensing dish is electrically connected with corresponding circular protective plate by conductive pole, protective ring is electrically connected with the signal input part of sensing controler, and sensing dish is electrically connected with the signal output part of sensing controler.
As preferably, described keyboard sensing plate is six layers of printed circuit board, comprises insulating top layer, bottom and the first middle layer from top to bottom arranged, the second middle layer, the 3rd middle layer, the 4th middle layer; Described 3rd middle layer, the 4th middle layer are equipped with a pair snakelike signal wire, and often pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole; 4 output terminals are all electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
Snakelike signal wire be arranged so that the person of disassembling successively can only disassemble keyboard sensing plate; after exposing snakelike signal wire and printed contact electric connection point; need to connect corresponding signal level on corresponding electric connection point; then the snakelike signal wire of current layer is cleaned out; then the protection circuit of lower one deck is cracked again; make to disassemble difficulty to improve, extremely difficult being issued in the condition of not triggering secure controller self-destruction disassembles object.
As preferably, described core circuit plate is arranged by 5 pieces of four layers of printed circuit boards and forms, and include a pair snakelike signal wire in two internal planes of four layers of printed circuit board, often pair of snakelike signal wire comprises two signal input parts and two signal output parts; Two signal input parts are electrically connected with intrusion detection circuit by conductive pole; Two signal output parts are electrically connected with intrusion detection circuit by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
Snakelike signal wire be arranged so that the person of disassembling successively can only disassemble core circuit plate; when after the electric connection point exposing snakelike signal wire and intrusion detection circuit; need to connect corresponding signal level on corresponding electric connection point; then the snakelike signal wire of current layer is cleaned out; then the protection circuit of lower one deck is cracked again; make to disassemble difficulty to improve, extremely difficult being issued in the condition of not triggering secure controller self-destruction disassembles object.Signal level in two signal line of next-door neighbour is contrary.
The restriction of live width and distance between centers of tracks makes to hole to circuit board, cutting method is extremely difficult to the catch net overcoming snakelike signal wire and formed; circuit board is holed or one or more wiring broken string or short circuit that cutting can make in serpentine, thus trigger controller starts self-destruction program.
As preferably, described intrusion detection circuit comprises resistance R1, resistance R2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected with an output terminal of the source electrode of VCC, T2, often pair of snakelike signal wire respectively, and the R1 other end is electrically connected with the grid of T1 and another output terminal of often pair of snakelike signal wire respectively; The grid of the drain electrode of T1 an input end of signal wire snakelike with often pair, R2 one end and T2 is respectively electrically connected; The source electrode of T1 respectively another input end of signal wire snakelike with often pair and the R2 other end is electrically connected and ground connection; Drain electrode for the T2 exporting self-destruction signal is electrically connected with safety governor.
As preferably, described printed contact comprises at least 4 rectangular pads, conductive rubber is rearranged by the conductive rubber slice of at least 4 mutually insulateds, and the upper and lower end face of conductive rubber slice contacts with the rectangular pads on keyboard sensing plate lower surface and core circuit plate upper surface respectively.
As preferably, the lower surface of key panel comprises 4 studs, and 4 studs are connected with clamp nut through after framework, silica gel pad, upper protection circuit plate, keyboard board successively; Keyboard bonnet is connected with keyboard board.
In sum: adopt this active probe EPP button and keyboard sensing plate distance; and all core circuits are hidden in the combined sealing structure protected by security mechanism; the person of disassembling must disassemble the principle that could obtain internal protection mechanism completely to EPP; and disassemble the protection mechanism that must cause EPP completely; therefore the person of disassembling needs a sample to disassemble analysis completely at least, improve the difficulty and cost of analyzing EPP protection mechanism.After the person of disassembling knows EPP protection philosophy, when its key circuit place of attempting under the button of EPP keyboard installs and steals circuit, if do not destroyed button and sensing plate distance, and adopt insertion between button and sensing plate to steal sensor, any foreign matter inserted between button and sensing plate all can cause the capacitance characteristic in this region to change, thus triggers the protection mechanism of EPP; When the person of disassembling attempts to disassemble from EPP keyboard bottom, can trigger between core circuit plate and keyboard sensing plate by protection mechanism that conductive rubber provides.All triggerings to protection mechanism; the self-destruction program of safety governor is independently caused in capital; make EPP keyboard enter firmware and damage state; adopt the EPP keyboard of these protection mechanisms; have and higher disassemble difficulty and security, thus improve the security that ATM uses, improve the anti-attack ability of ATM (Automatic Teller Machine); reduce the risk that cardholder information is revealed and property is impaired, guarantee that in cardholder account, debt is not easily stolen.
Therefore, the present invention has following beneficial effect: it is large that (1) disassembles difficulty, and anti-attack ability is strong, and data security is good; (2) professional knowledge is needed to the analysis of protection mechanism, analyze difficulty high; (3) reduce the risk that cardholder information is revealed and property is impaired, guarantee that in cardholder account, debt is not easily stolen.
Accompanying drawing explanation
Fig. 1 is a kind of detonation configuration schematic diagram of the present invention;
Fig. 2 is the second detonation configuration schematic diagram of the present invention;
Fig. 3 is the third detonation configuration schematic diagram of the present invention;
Fig. 4 is a kind of structural representation that intrusion detection circuit of the present invention is electrically connected with snakelike signal wire;
Fig. 5 is a kind of theory diagram of embodiments of the invention;
Fig. 6 is a kind of cross-sectional structure schematic diagram of core circuit plate of the present invention;
Fig. 7 is a kind of structural representation in the first middle layer of the present invention;
Fig. 8 is a kind of structural representation in the second middle layer of the present invention.
In figure: key panel 1, framework 2, metal key-press 3, plastic spacer 4, keyboard board 5, keyboard sensing plate 6, core circuit plate 7, core over cap 8, keyboard bonnet 9, through hole 10, sensor 11, safety governor 12, sensing controler 13, printed contact 14, conductive rubber block 15, intrusion detection circuit 16, elastic bumps 17, cable connector 18, signal cable 19, top layer 20, bottom 21, first middle layer 22, second middle layer 23, 3rd middle layer 24, 4th middle layer 25, protective ring 26, sensing dish 27, circular protective plate 28, snakelike signal wire 29, signal input part 30, signal output part 31, stud 33, clamp nut 34, battery 35, USB interface 36, projection 37, front screw 38, rear screw 39, button limitting casing 40.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment is as shown in Figure 1, shown in Figure 5 the EPP keyboard that a kind of security performance is good, comprises the key panel 1 set gradually from front to back, framework 2,16 metal key-press 3, plastic spacer 4, keyboard board 5, keyboard sensing plate 6, core circuit plate 7, core over cap 8, keyboard bonnets 9 of comprising 16 button limitting casings 40; Each metal key-press lays respectively in each button limitting casing, key panel is connected with keyboard board with framework, plastic spacer successively, keyboard sensing plate is connected with core circuit plate, core over cap successively, and keyboard bonnet covers core over cap and is connected with keyboard board with plastic spacer;
Plastic spacer is provided with 20 projections 37 matched with each metal key-press, position corresponding with each projection on keyboard board is equipped with through hole 10; The position corresponding with each projection of keyboard sensing plate is provided with 20 sensors 11 of the spacing for detecting metal key-press and keyboard sensing plate; Core circuit plate is provided with safety governor 12 and sensing controler 13; Each sensor is electrically connected with sensing controler, and sensing controler is electrically connected with safety governor.
In Fig. 5, also comprise battery 35, battery is electrically connected with the cable connector of keyboard sensing plate.Framework in the present embodiment is metal material.
Printed contact comprises 4 rectangular pads, and conductive rubber is rearranged by the conductive rubber slice of 4 mutually insulateds, and the upper and lower end face of 4 conductive rubber slices contacts with 4 rectangular pads on keyboard sensing plate lower surface and core circuit plate upper surface respectively.
As shown in Figure 2, before utilizing, screw 38 keyboard sensing plate is connected with core circuit plate, core over cap successively, and after keyboard bonnet utilizes, screw 39 is connected with keyboard board with plastic spacer successively.
Keyboard sensing plate lower surface is provided with 2 printed contacts 14, core circuit plate upper surface is provided with 2 printed contacts matched with 2 printed contacts of keyboard sensing plate respectively, conductive rubber block 15 is provided with between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, 2 printed contacts on keyboard sensing plate are electrically connected by printed conductor, 2 printed contacts on core circuit plate are electrically connected with the intrusion detection circuit 16 be located on core circuit plate respectively, and intrusion detection circuit is electrically connected with safety governor.
As shown in Figure 1, plastic spacer top surface edge is provided with 2 elastic bumps 17, and the keyboard sensing plate corresponding with 2 elastic bumps is provided with conductive coating; The plastic spacer at elastic bumps place and ATM squeeze flow, safety governor is electrically connected with conductive coating and the USB interface 36 be located on keyboard mainboard respectively.
As shown in Figure 2, keyboard sensing plate and core circuit plate all also comprise cable connector 18, the cable connector of keyboard sensing plate and the cable connector of core circuit plate are electrically connected by signal cable 19, cable connector on keyboard sensing plate is connected with sensor electrical, and the cable connector on core circuit plate is electrically connected with sensing controler.
As shown in Figure 6, keyboard sensing plate is six layers of printed circuit board, comprises top layer 20, bottom 21 and the first middle layer 23, middle layer 22, second from top to bottom arranged, the 3rd middle layer 24, the 4th middle layer 25;
As shown in Figure 7, Figure 8, sensor comprises the protective ring 26 be printed on the first middle layer, is printed on the sensing dish 27 in protective ring and is printed on the circular protective plate 28 belt corresponding with protection in the second middle layer, sensing dish is electrically connected with corresponding circular protective plate by conductive pole, protective ring is electrically connected with the signal input part of sensing controler, and sensing dish is electrically connected with the signal output part of sensing controler.
3rd middle layer, the 4th middle layer are equipped with a pair snakelike signal wire, and often pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole; 4 output terminals are all electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole.
Core circuit plate is arranged by 5 pieces of four layers of printed circuit boards and forms, and include a pair snakelike signal wire 29 in two of four layers of printed circuit board internal planes as shown in Figure 4, often pair of snakelike signal wire comprises two signal input parts 30 and two signal output parts 31; Two signal input parts are electrically connected with intrusion detection circuit by conductive pole; Two signal output parts are electrically connected with intrusion detection circuit by conductive pole.Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
As shown in Figure 4, intrusion detection circuit comprises resistance R1, resistance R2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected with an output terminal of the source electrode of VCC, T2, often pair of snakelike signal wire respectively, and the R1 other end is electrically connected with the grid of T1 and another output terminal of often pair of snakelike signal wire respectively; The grid of the drain electrode of T1 an input end of signal wire snakelike with often pair, R2 one end and T2 is respectively electrically connected; The source electrode of T1 respectively another input end of signal wire snakelike with often pair and the R2 other end is electrically connected and ground connection; Drain electrode for the T2 exporting self-destruction signal is electrically connected with safety governor.
As shown in Figure 1 and Figure 2, the lower surface of key panel comprises 4 studs, 33,4 studs successively through framework, plastic spacer, be connected with clamp nut 34 after keyboard board; Keyboard bonnet is connected with keyboard board.
Snakelike signal wire, pad and conductive pole in the present embodiment all adopt copper product.
Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Claims (9)
1. the EPP keyboard that a security performance is good, comprise the key panel (1) set gradually from front to back, the framework (2) comprising several button limitting casings (40), the metal key-press (3) identical with button limitting casing quantity and plastic spacer (4), each metal key-press lays respectively in each button limitting casing, key panel is connected with plastic spacer with framework successively, and plastic spacer is provided with several projections matched with each metal key-press (37); It is characterized in that, also comprise the rear keyboard board (5) arranged backward successively, keyboard sensing plate (6), core circuit plate (7), core over cap (8) and keyboard bonnet (9) after being positioned at plastic spacer; Key panel is connected with keyboard board, and keyboard sensing plate is connected with core circuit plate, core over cap successively, and keyboard bonnet covers core over cap and is connected with keyboard board with plastic spacer;
Position corresponding with each projection on keyboard board is equipped with through hole (10); Be provided with several sensors (11) of the spacing for detecting metal key-press and keyboard sensing plate in the position corresponding with each projection of keyboard sensing plate, the quantity of sensor is identical with the quantity of projection; Core circuit plate is provided with safety governor (12) and sensing controler (13); Each sensor is electrically connected with sensing controler, and sensing controler is electrically connected with safety governor;
Described keyboard sensing plate is six layers of printed circuit board, comprises insulating top layer (20), bottom (21) and the first middle layer (22) from top to bottom arranged, the second middle layer (23), the 3rd middle layer (24), the 4th middle layer (25); Described sensor comprises the protective ring (26) be printed on the first middle layer, be printed on sensing dish (27) in protective ring and be printed on circular protective plate (28) in the second middle layer and corresponding with protective ring, sensing dish is electrically connected with corresponding circular protective plate by conductive pole, protective ring is electrically connected with the signal input part of sensing controler, and sensing dish is electrically connected with the signal output part of sensing controler.
2. the EPP keyboard that a kind of security performance according to claim 1 is good, it is characterized in that, described keyboard sensing plate lower surface is provided with M printed contact (14), M >=2, core circuit plate upper surface is provided with M the printed contact matched with each printed contact of keyboard sensing plate respectively, conductive rubber block (15) is provided with between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, M printed contact on keyboard sensing plate is electrically connected by printed conductor, M printed contact on core circuit plate is electrically connected with the intrusion detection circuit (16) be located on core circuit plate respectively, intrusion detection circuit is electrically connected with safety governor.
3. the EPP keyboard that a kind of security performance according to claim 1 is good, is characterized in that, described plastic spacer top surface edge is provided with 2 elastic bumps (17), and the keyboard sensing plate corresponding with 2 elastic bumps is provided with conductive coating; The plastic spacer at elastic bumps place and ATM squeeze flow, safety governor is electrically connected with conductive coating and the USB interface (36) be located on keyboard mainboard respectively.
4. the EPP keyboard that a kind of security performance according to claim 1 is good, it is characterized in that, described keyboard sensing plate and core circuit plate all also comprise cable connector (18), the cable connector of keyboard sensing plate and the cable connector of core circuit plate are by signal cable (19) electrical connection, cable connector on keyboard sensing plate is connected with each sensor electrical, and the cable connector on core circuit plate is electrically connected with sensing controler.
5. the EPP keyboard that a kind of security performance according to claim 2 is good, it is characterized in that, described keyboard sensing plate is six layers of printed circuit board, comprises insulating top layer, bottom and the first middle layer from top to bottom arranged, the second middle layer, the 3rd middle layer, the 4th middle layer; Described 3rd middle layer, the 4th middle layer are equipped with a pair snakelike signal wire, and often pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole; 4 output terminals are all electrically connected with the printed contact on keyboard sensing plate lower surface respectively by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
6. the EPP keyboard that a kind of security performance according to claim 2 is good, it is characterized in that, described core circuit plate is arranged by 5 pieces of four layers of printed circuit boards and forms, include a pair snakelike signal wire (29) in two internal planes of four layers of printed circuit board, often pair of snakelike signal wire comprises two signal input parts (30) and two signal output parts (31); Two signal input parts are electrically connected with intrusion detection circuit by conductive pole; Two signal output parts are electrically connected with intrusion detection circuit by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
7. the EPP keyboard that a kind of security performance according to claim 6 is good, is characterized in that, described intrusion detection circuit comprises resistance R1, resistance R2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected with an output terminal of the source electrode of VCC, T2, often pair of snakelike signal wire respectively, and the R1 other end is electrically connected with the grid of T1 and another output terminal of often pair of snakelike signal wire respectively; The grid of the drain electrode of T1 an input end of signal wire snakelike with often pair, R2 one end and T2 is respectively electrically connected; The source electrode of T1 respectively another input end of signal wire snakelike with often pair and the R2 other end is electrically connected and ground connection; Drain electrode for the T2 exporting self-destruction signal is electrically connected with safety governor.
8. the EPP keyboard that a kind of security performance according to claim 2 is good, it is characterized in that, described printed contact comprises at least 4 rectangular pads, conductive rubber is rearranged by the conductive rubber slice of at least 4 mutually insulateds, and the upper and lower end face of conductive rubber slice contacts with the rectangular pads on keyboard sensing plate lower surface and core circuit plate upper surface respectively.
9. the EPP keyboard that a kind of security performance according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 is good, it is characterized in that, the lower surface of key panel comprises 4 studs (33), and 4 studs are connected with clamp nut (34) through after framework, plastic spacer, keyboard board successively; Keyboard bonnet is connected with keyboard board.
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| CN201410031257.3A CN103942890B (en) | 2014-01-23 | 2014-01-23 | The EPP keyboard that a kind of security performance is good |
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| CN201410031257.3A CN103942890B (en) | 2014-01-23 | 2014-01-23 | The EPP keyboard that a kind of security performance is good |
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| CN103942890B true CN103942890B (en) | 2016-03-30 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104240384B (en) * | 2014-08-20 | 2017-12-08 | 深圳怡化电脑股份有限公司 | Metal encrypted keyboard and the method for manufacturing the metal encrypted keyboard |
| TWI665585B (en) * | 2018-10-04 | 2019-07-11 | 群光電子股份有限公司 | keyboard |
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Effective date of registration: 20210826 Address after: 310000 No. 66 Dongxin Avenue, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: EASTCOM Inc. Address before: 310000 A318, R & D building, Dongxin City, No. 66, Dongxin Avenue, Binjiang District, Hangzhou City, Zhejiang Province Patentee before: EASTCOM Inc. Patentee before: Hangzhou Eastcom Financial Technology Service Co.,Ltd. |
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