CN103942890A - EPP keyboard good in confidentiality - Google Patents
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- CN103942890A CN103942890A CN201410031257.3A CN201410031257A CN103942890A CN 103942890 A CN103942890 A CN 103942890A CN 201410031257 A CN201410031257 A CN 201410031257A CN 103942890 A CN103942890 A CN 103942890A
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Abstract
The invention discloses an EPP keyboard good in confidentiality. The EPP keyboard comprises a keyboard panel, a frame comprising a plurality of key limiting frames, metal keys with the same number as the key limiting frames, a plastic spacer, a keyboard bottom plate, a keyboard sensing plate, a core circuit board, a core protection cover and a rear keyboard cover, wherein the keyboard panel, the frame, the metal keys, the plastic spacer, the keyboard bottom plate, the keyboard sensing plate, the core circuit board, the core protection cover and the rear keyboard cover are sequentially arranged from front to back. The metal keys are arranged in the key limiting frames respectively. The keyboard panel is connected with the frame, the plastic spacer and the keyboard bottom plate sequentially. The keyboard sensing plate is connected with the core circuit board and the core protection cover sequentially. The rear keyboard cover covers the core protection cover and is connected with the plastic spacer and the keyboard bottom plate. The EPP keyboard has the advantages of being large in disassembly difficulty, high in attack resistance and good in data security, lowering the risk of information leakage and property loss of cardholders and guaranteeing that money of the accounts of the cardholders can not be stolen easily.
Description
Technical field
The present invention relates to ATM (automatic teller machine) (ATM) safety protection technique field, especially relate to that a kind of to resist external attack ability strong, the good EPP keyboard of security performance that the Transaction Information of EPP keyboard is difficult for being stolen.
Background technology
EPP keyboard is the user data input equipment that is installed on the holder in ATM, when holder uses ATM to conclude the business, need to input PIN code, and EPP keyboard is given backstage after PIN code is encrypted and verified.
At present, the attack means of EPP keyboard is mainly: BUG circuit is installed at the button place at the key panel of EPP keyboard, when holder is during by EPP keyboard input PIN code, BUG circuit records the plaintext of PIN code; Thereby steal the Transaction Information of EPP keyboard.
Therefore, at present in the urgent need to developing the EPP keyboard that a kind of security performance is good, thereby guarantee that holder's PIN is not obtained by lawless person, protection holder's personal information and the safety of account.
Chinese patent mandate publication number: CN201237811Y, authorize open day on May 13rd, 2009, a kind of reinforced ATM keyboard is disclosed, comprise key panel, be arranged on the circuit board of key panel below, by key panel and tight fixing screw and the nut of circuit board, the position that described key panel is fixedly mounted with screw is embedded with reinforcement.The weak point of this utility model is, resist external attack ability a little less than, the Transaction Information of EPP keyboard is easily stolen.
Summary of the invention
Goal of the invention of the present invention is poor in order to overcome EPP keyboard security performance of the prior art, the deficiency that the Transaction Information of EPP keyboard is easily stolen, provide that a kind of to resist external attack ability strong, the good EPP keyboard of security performance that the Transaction Information of EPP keyboard is difficult for being stolen.
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 setting gradually from front to back, the framework that comprises 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 framework, plastic spacer and keyboard board 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 matching with each metal key-press, on keyboard board, on the position corresponding with each projection, is equipped with through hole; In the position corresponding with each projection of keyboard sensing plate, be provided with several sensors for detection of distance between metal key-press and 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 to sensing controler, and sensing controler is electrically connected to safety governor.
Sensor of the present invention can detect distance between metal key-press and keyboard sensing plate, if someone wants, at the metal key-press circuit place on keyboard mainboard surface, BUG circuit is installed, need to first disassemble each assembly of EPP keyboard, but, in the process of disassembling, can cause between metal key-press and keyboard sensing plate distance not normal, safety governor obtains after the not normal signal of distance, and the program and the data that store in controller are deleted in control automatically, thereby has guaranteed the security of the data in EPP keyboard.
Therefore, it is strong that the present invention has the external attack of resisting ability, and the Transaction Information of EPP keyboard is difficult for being stolen, and reduced cardholder information and revealed and the impaired risk of property, guarantees the feature that in cardholder account, debt is difficult for being 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 matching with each printed contact of keyboard sensing plate respectively, between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, be provided with conductive rubber block, M on a keyboard sensing plate printed contact is electrically connected to by printed conductor, M on a core circuit plate printed contact is electrically connected to the intrusion detection circuit of being located on core circuit plate respectively, and intrusion detection circuit is electrically connected to safety governor.
Conductive rubber block makes pad corresponding in printed contact on keyboard sensing plate and the printed contact on core circuit plate form to be electrically connected under the squeezing action of keyboard sensing plate and core circuit plate; If someone wants, at the key circuit place on keyboard board surface, BUG circuit is installed, need to first disassemble each assembly of EPP keyboard, but, in the process of disassembling, can cause the pressure that conductive rubber block upper and lower surface is subject to be lost, and further cause conductive rubber to disconnect with the electrical connection of pad corresponding in printed contact on keyboard sensing plate and the printed contact on core circuit plate, safety governor detects after circuit disconnection, automatically the program and the data that store in controller are deleted in control, thereby have guaranteed 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 is connected with ATM extruding, and safety governor is electrically connected to conductive coating and the USB interface of being located on keyboard mainboard respectively.
ATM keyboard installation place back side of panel comprises 4 double-screw bolts, and 4 double-screw bolts are successively through being connected with clamp nut after plastic spacer, keyboard board, exposed plastic spacer and the tight pressing of ATM panel outside key panel.
This mounting means can only make EPP key panel out exposed, has increased the difficulty that outside violence is disassembled.
Under normal condition, together with plastic spacer is closely pressed together on ATM panel, elastic bumps can push conductive coating, thereby conductive coating is electrically connected to safety governor, when needs are normally disassembled each assembly of EPP keyboard, by USB interface to safety governor input of control commands, the disconnection that is electrically connected to of conductive coating and safety governor, safety governor can start-up routine and the self-destruction program of data yet;
But, if not by USB interface to safety governor input of control commands, the disconnection that is electrically connected to of conductive coating and safety governor; Safety governor has thought to receive outside attack, and the program and the data that store in controller are deleted in control automatically, thereby has guaranteed the security of the data in EPP keyboard.
As preferably, on described keyboard sensing plate and core circuit plate, all also comprise cable connector, the cable connector of the cable connector of keyboard sensing plate and core circuit plate is electrically connected to 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 to sensing controler.
As preferably, described keyboard sensing plate is six layers of printed circuit board, comprises insulation top layer, bottom and the first middle layer, the second middle layer, the 3rd middle layer, the 4th middle layer of from top to bottom arranging; Described sensor comprises the protective ring that is printed on the first middle layer, be printed on sensing dish in protective ring and be printed on the second middle layer in and the circular protective plate corresponding with protective ring, sensing dish is electrically connected to corresponding circular protective plate by conductive pole, protective ring is electrically connected to the signal input part of sensing controler, and sensing dish is electrically connected to the signal output part of sensing controler.
As preferably, described keyboard sensing plate is six layers of printed circuit board, comprises insulation top layer, bottom and the first middle layer, the second middle layer, the 3rd middle layer, the 4th middle layer of from top to bottom arranging; On described the 3rd middle layer, the 4th middle layer, be equipped with a pair of snakelike signal wire, every pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected to the printed contact on keyboard sensing plate lower surface by conductive pole respectively; 4 output terminals are all electrically connected to 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.
The person of disassembling that is arranged so that of snakelike signal wire can only successively disassemble keyboard sensing plate; after exposing snakelike signal wire and printed contact electric connection point; need to be to connecting corresponding signal level on corresponding electric connection point; then the snakelike signal wire of current layer is cleaned out; then crack again the protection circuit of lower one deck; make to disassemble difficulty and improve, extremely difficulty is issued to and disassembles object in the condition that does not trigger safety governor self-destruction.
As preferably, described core circuit plate is arranged and is formed by 5 four layers of printed circuit boards, includes a pair of snakelike signal wire in two of four layers of printed circuit board in electricity layer, and every pair of snakelike signal wire comprises two signal input parts and two signal output parts; Two signal input parts are electrically connected to intrusion detection circuit by conductive pole; Two signal output parts are electrically connected to intrusion detection circuit by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
The person of disassembling that is arranged so that of snakelike signal wire can only successively disassemble core circuit plate; after exposing the electric connection point of snakelike signal wire and intrusion detection circuit; need to be to connecting corresponding signal level on corresponding electric connection point; then the snakelike signal wire of current layer is cleaned out; then crack again the protection circuit of lower one deck; make to disassemble difficulty and improve, extremely difficulty is issued to and disassembles object in the condition that does not trigger safety governor self-destruction.Signal level in next-door neighbour's two signal line is contrary.
The restriction of live width and distance between centers of tracks makes the catch net that circuit board is holed, cutting method overcomes snakelike signal wire formation extremely difficult; circuit board is holed or cutting can make the wiring broken string of one or more in serpentine or short circuit, thereby trigger controller starts self-destruction program.
As preferably, described intrusion detection circuit comprises resistance R 1, resistance R 2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected to an output terminal of the source electrode of VCC, T2, every pair of snakelike signal wire respectively, and the R1 other end is electrically connected to the grid of T1 and another output terminal of every pair of snakelike signal wire respectively; The drain electrode of T1 is electrically connected to the grid of an input end, R2 one end and the T2 of every pair of snakelike signal wire respectively; The source electrode of T1 is electrically connected to also ground connection with another input end and the R2 other end of every pair of snakelike signal wire respectively; For exporting the drain electrode of the T2 of self-destruction signal, be electrically connected to 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 double-screw bolts, and 4 double-screw bolts are successively through being connected with clamp nut after framework, silica gel pad, upper holding circuit plate, keyboard board; 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 of being 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, difficulty and the cost of analyzing EPP protection mechanism have been improved.When the person of disassembling is known after EPP protection philosophy, install while stealing circuit at its key circuit place of attempting under the button of EPP keyboard, if do not destroyed button and sensing plate distance, and adopt to insert, steal sensor between button and sensing plate, any foreign matter inserting between button and sensing plate all can cause the capacitance characteristic in this region to change, thereby triggers the protection mechanism of EPP; When the person of disassembling attempts to disassemble from EPP keyboard bottom, can trigger the protection mechanism providing by conductive rubber between core circuit plate and keyboard sensing plate.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; there is higher disassemble difficulty and security, thereby improve the security that ATM is used, improved the anti-attack ability of ATM (Automatic Teller Machine); reduced cardholder information and revealed and the impaired risk of property, guaranteed that in cardholder account, debt is difficult for being 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) analysis of protection mechanism is needed to professional knowledge, analyze difficulty high; (3) reduce cardholder information and reveal and the impaired risk of property, guarantee that in cardholder account, debt is difficult for being stolen.
Accompanying drawing explanation
Fig. 1 is a kind of blast structural representation of the present invention;
Fig. 2 is the second blast structural representation of the present invention;
Fig. 3 is the third blast structural representation of the present invention;
Fig. 4 is a kind of structural representation that intrusion detection circuit of the present invention is electrically connected to 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, the first middle layer 22, the second middle layer 23, the 3rd middle layer 24, the 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, double-screw bolt 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 setting gradually from front to back, 2,16 metal key-press 3 of framework, plastic spacer 4, keyboard board 5, keyboard sensing plate 6, core circuit plate 7, core over cap 8, the keyboard bonnet 9 that comprises 16 button limitting casings 40; Each metal key-press lays respectively in each button limitting casing, key panel is connected with framework, plastic spacer and keyboard board 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 that match with each metal key-press, on keyboard board, on the position corresponding with each projection, is equipped with through hole 10; The position corresponding with each projection of keyboard sensing plate is provided with 20 sensors 11 for detection of distance between 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 to sensing controler, and sensing controler is electrically connected to safety governor.
In Fig. 5, also comprise battery 35, battery is electrically connected to 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 plates are connected with core circuit plate, core over cap successively, and after the utilization of keyboard bonnet, 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 that match with 2 printed contacts of keyboard sensing plate respectively, between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, be provided with conductive rubber block 15,2 printed contacts on keyboard sensing plate are electrically connected to by printed conductor, 2 printed contacts on core circuit plate are electrically connected to the intrusion detection circuit 16 of being located on core circuit plate respectively, and intrusion detection circuit is electrically connected to 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 is connected with ATM extruding, and safety governor is electrically connected to conductive coating and the USB interface 36 of being located on keyboard mainboard respectively.
As shown in Figure 2, on keyboard sensing plate and core circuit plate, all also comprise cable connector 18, the cable connector of the cable connector of keyboard sensing plate and core circuit plate is electrically connected to 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 to 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 22, the second middle layer 23, the 3rd middle layer 24, the 4th middle layer 25 of from top to bottom arranging;
As shown in Figure 7, Figure 8, sensor comprises the protective ring 26 that is printed on the first middle layer, be printed on the sensing dish 27 in protective ring and be printed in the second middle layer with the protection corresponding circular protective plate 28 that goes in ring, sensing dish is electrically connected to corresponding circular protective plate by conductive pole, protective ring is electrically connected to the signal input part of sensing controler, and sensing dish is electrically connected to the signal output part of sensing controler.
On the 3rd middle layer, the 4th middle layer, be equipped with a pair of snakelike signal wire, every pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected to the printed contact on keyboard sensing plate lower surface by conductive pole respectively; 4 output terminals are all electrically connected to the printed contact on keyboard sensing plate lower surface respectively by conductive pole.
Core circuit plate is arranged and is formed by 5 four layers of printed circuit boards, in two of four layers of printed circuit board interior electricity layers as shown in Figure 4, includes a pair of snakelike signal wire 29, and every pair of snakelike signal wire comprises two signal input parts 30 and two signal output parts 31; Two signal input parts are electrically connected to intrusion detection circuit by conductive pole; Two signal output parts are electrically connected to 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 R 1, resistance R 2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected to an output terminal of the source electrode of VCC, T2, every pair of snakelike signal wire respectively, and the R1 other end is electrically connected to the grid of T1 and another output terminal of every pair of snakelike signal wire respectively; The drain electrode of T1 is electrically connected to the grid of an input end, R2 one end and the T2 of every pair of snakelike signal wire respectively; The source electrode of T1 is electrically connected to also ground connection with another input end and the R2 other end of every pair of snakelike signal wire respectively; For exporting the drain electrode of the T2 of self-destruction signal, be electrically connected to safety governor.
As shown in Figure 1 and Figure 2, the lower surface of key panel comprises that 33,4 double-screw bolts of 4 double-screw bolts are successively through being connected with clamp nut 34 after framework, plastic spacer, 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 and limits the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1. the EPP keyboard that security performance is good, it is characterized in that, comprise the key panel (1) setting gradually from front to back, the framework (2) that comprises several button limitting casings (40), metal key-press (3), plastic spacer (4), keyboard board (5), keyboard sensing plate (6), core circuit plate (7), core over cap (8) and the keyboard bonnet (9) identical with button limitting casing quantity; Each metal key-press lays respectively in each button limitting casing, key panel is connected with framework, plastic spacer and keyboard board 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 (37) matching with each metal key-press, on keyboard board, on the position corresponding with each projection, is equipped with through hole (10); In the position corresponding with each projection of keyboard sensing plate, be provided with several sensors (11) for detection of distance between metal key-press and 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 to sensing controler, and sensing controler is electrically connected to safety governor.
2. the good EPP keyboard of a kind of security performance according to claim 1, 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 matching with each printed contact of keyboard sensing plate respectively, between the printed contact of keyboard sensing plate and the corresponding printed contact of core circuit plate, be provided with conductive rubber block (15), M on a keyboard sensing plate printed contact is electrically connected to by printed conductor, M on a core circuit plate printed contact is electrically connected to the intrusion detection circuit (16) of being located on core circuit plate respectively, intrusion detection circuit is electrically connected to safety governor.
3. the good EPP keyboard of a kind of security performance according to claim 1, 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 is connected with ATM extruding, and safety governor is electrically connected to conductive coating and the USB interface (36) of being located on keyboard mainboard respectively.
4. the good EPP keyboard of a kind of security performance according to claim 1, it is characterized in that, on described keyboard sensing plate and core circuit plate, all also comprise cable connector (18), the cable connector of the cable connector of keyboard sensing plate and core circuit plate is electrically connected to by signal cable (19), cable connector on keyboard sensing plate is connected with each sensor electrical, and the cable connector on core circuit plate is electrically connected to sensing controler.
5. the good EPP keyboard of a kind of security performance according to claim 1, it is characterized in that, described keyboard sensing plate is six layers of printed circuit board, comprise insulation top layer (20), bottom (21) and the first middle layer (22), the second middle layer (23), the 3rd middle layer (24), the 4th middle layer (25) of arranging from top to bottom; Described sensor comprises the protective ring (26) that is printed on the first middle layer, be printed on sensing dish (27) in protective ring and be printed on the second middle layer in and the circular protective plate (28) corresponding with protective ring, sensing dish is electrically connected to corresponding circular protective plate by conductive pole, protective ring is electrically connected to the signal input part of sensing controler, and sensing dish is electrically connected to the signal output part of sensing controler.
6. the good EPP keyboard of a kind of security performance according to claim 2, it is characterized in that, described keyboard sensing plate is six layers of printed circuit board, comprises insulation top layer, bottom and the first middle layer, the second middle layer, the 3rd middle layer, the 4th middle layer of from top to bottom arranging; On described the 3rd middle layer, the 4th middle layer, be equipped with a pair of snakelike signal wire, every pair of snakelike signal wire comprises two signal input parts and two signal output parts; 4 input ends are electrically connected to the printed contact on keyboard sensing plate lower surface by conductive pole respectively; 4 output terminals are all electrically connected to 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.
7. the good EPP keyboard of a kind of security performance according to claim 2, it is characterized in that, described core circuit plate is arranged and is formed by 5 four layers of printed circuit boards, in two of four layers of printed circuit board, in electricity layer, include a pair of snakelike signal wire (29), every pair of snakelike signal wire comprises two signal input parts (30) and two signal output parts (31); Two signal input parts are electrically connected to intrusion detection circuit by conductive pole; Two signal output parts are electrically connected to intrusion detection circuit by conductive pole; Live width≤the 6mil of snakelike signal wire, distance between centers of tracks≤6mil.
8. the good EPP keyboard of a kind of security performance according to claim 7, is characterized in that, described intrusion detection circuit comprises resistance R 1, resistance R 2, field effect transistor T1 and field effect transistor T2; R1 one end is electrically connected to an output terminal of the source electrode of VCC, T2, every pair of snakelike signal wire respectively, and the R1 other end is electrically connected to the grid of T1 and another output terminal of every pair of snakelike signal wire respectively; The drain electrode of T1 is electrically connected to the grid of an input end, R2 one end and the T2 of every pair of snakelike signal wire respectively; The source electrode of T1 is electrically connected to also ground connection with another input end and the R2 other end of every pair of snakelike signal wire respectively; For exporting the drain electrode of the T2 of self-destruction signal, be electrically connected to safety governor.
9. the good EPP keyboard of a kind of security performance according to claim 2, 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.
10. according to the good EPP keyboard of a kind of security performance described in claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, it is characterized in that, the lower surface of key panel comprises 4 double-screw bolts (33), and 4 double-screw bolts are successively through being connected with clamp nut (34) after framework, plastic spacer, keyboard board; Keyboard bonnet is connected with keyboard board.
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| CN111009436A (en) * | 2018-10-04 | 2020-04-14 | 群光电子股份有限公司 | Keyboard with a keyboard body |
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| CN202771533U (en) * | 2012-08-06 | 2013-03-06 | 深圳市新达通科技股份有限公司 | Encryption keyboard and self-service device utilizing the same |
| CN203366064U (en) * | 2013-07-09 | 2013-12-25 | 东方通信股份有限公司 | Automatic teller machine card reader safety monitoring device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240384A (en) * | 2014-08-20 | 2014-12-24 | 深圳怡化电脑股份有限公司 | Metal encryption keyboard and manufacturing method of metal encryption keyboard |
| CN111009436A (en) * | 2018-10-04 | 2020-04-14 | 群光电子股份有限公司 | Keyboard with a keyboard body |
| CN111009436B (en) * | 2018-10-04 | 2021-12-21 | 群光电子股份有限公司 | Keyboard with a keyboard body |
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| CN103942890B (en) | 2016-03-30 |
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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. |