EP0472698A1 - Ordinateur personnel blinde - Google Patents

Ordinateur personnel blinde

Info

Publication number
EP0472698A1
EP0472698A1 EP19910906080 EP91906080A EP0472698A1 EP 0472698 A1 EP0472698 A1 EP 0472698A1 EP 19910906080 EP19910906080 EP 19910906080 EP 91906080 A EP91906080 A EP 91906080A EP 0472698 A1 EP0472698 A1 EP 0472698A1
Authority
EP
European Patent Office
Prior art keywords
housing
personal computer
shielded
computer according
radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP19910906080
Other languages
German (de)
English (en)
Inventor
Thomas Vielhaben
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PANAVIA AIRCRAFT GmbH
Original Assignee
PANAVIA AIRCRAFT GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PANAVIA AIRCRAFT GmbH filed Critical PANAVIA AIRCRAFT GmbH
Publication of EP0472698A1 publication Critical patent/EP0472698A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/18—Packaging or power distribution
    • G06F1/181—Enclosures
    • G06F1/182—Enclosures with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]

Definitions

  • the invention relates to a shielded personal computer, i.e. a PC that is shielded against (high-frequency) electromagnetic (radio) radiation, or "eavesdropping", and thus the possibility of reading the data by unauthorized third parties, but is still locally mobile, i.e. remains portable.
  • a shielded personal computer i.e. a PC that is shielded against (high-frequency) electromagnetic (radio) radiation, or "eavesdropping", and thus the possibility of reading the data by unauthorized third parties, but is still locally mobile, i.e. remains portable.
  • Such computers are of great importance when used in areas requiring confidentiality, which include not only military areas of application, but often also development departments in industry, because they prevent unauthorized data interception (via the
  • Such shielded computers which are also called radiation-preventing or suppressing devices, are divided into four classes, class 1 being the least shielded and class 4 the best, ie the safest class.
  • the aim of the invention is therefore a PC that is so strongly electromagnetically shielded that practically no unauthorized reading or listening to the unprotected data is possible practically outside the usual workspace, in particular a PC that at least meets the requirements of class 4 of the current definition.
  • outer computer housing being made of a ferromagnetic material with high permeability and all of its components being copper-plated and additionally tinned, and this outer computer housing being nested with a second, inner Faraday * cage and by all bushings being designed as damping HF chimneys are. Additional constructive measures in the design and system assembly / assembly of the individual electronic components of the computer hardware reinforce the shielding effect.
  • Attached absorber materials convert the field energies into heat.
  • the outer Faraday's cage is made of a ferro-magnetic material with high permeability especially for damping the magnetic field components. Since the use of Permalloy or Dynamoblech IV is not always given in terms of production technology, components made from deep-drawn sheet metal must be heat-treated accordingly, if necessary. All components are copper-plated for better surface conduction. In order to ensure good electrical contact with the inserted contact spring strips, the housing components are additionally tinned, which has an additional absorbing effect due to the electromagnetic penetration.
  • the copper plating and tinning is essential for the shielding of all transitions that are not sealed by contact springs.
  • the inner housing that is to say the actual housing which contains the computer, preferably consists of 1 mm thick electrolytic copper.
  • All outgoing signal lines are double shielded, with the inner shield also connected to the innermost cage and the outer to the U housing of the computer.
  • PC is a system consisting of a computer unit (chip microelectronics on printed circuit boards plus mass storage and drives in one housing), keyboard, monitor (screen) and printer, the power lines and data cables form the individual, external inputs - / output devices the critical,
  • ⁇ Power cable can use a suitable filter
  • Positive openings for ventilation, cable inlets and openings for floppy disks as well as exchangeable disks are realized by hollow-conductor openings that are operated below the critical wavelength due to their physical dimensions.
  • the shielding is partly in the special application a known components for this special purpose of the shielded PC; partly these are new components that have been adapted for this special purpose, the suitable combination having the desired effect.
  • the radiation from the main housing cover is shielded by the use of beryllium contact spring strips and a low-torsion cover construction
  • the radiation from the system board is shielded by using a copper inner housing, preferably made from Irrm electrolytic copper, 7. the radiation from the cathode ray tube of the
  • the monitor is shielded by using a special screen with HF sealing gauze
  • the suppression of radiation is primarily achieved through the implementation of a double Faraday cage.
  • the outer cage encloses all system components in the form of individual housings for computers, printers, monitors and keyboards.
  • the outer shielding lies on a common shielding potential.
  • All electronic components are insulated and isolated inside the outer housing and enclosed with a second Faraday's cage. This results in an inner and an outer shield, the shielding potential of which is different from one another.
  • the cable connections between the individual outer housings are double-shielded lines, the inner cable shield lying on the inner shielding potential and the outer cable shielding on the outer shielding potential. So the double Farada 'see cage is not canceled by the cable connections.
  • the computer system normally consists of four individual devices that are connected to one another by data cables (signal lines). These 4 devices are:
  • the computer, monitor and printer have their own power supply with appropriate HF filtering.
  • the network is fed into the computer, monitor and printer via a normal IEC socket with a downstream EMI filter to block RF signals via the mains supply.
  • the cable bushings are protected against escaping radiation by special covers with HF chimneys.
  • the ventilation openings are sealed with a honeycomb filter.
  • the computer case is made of annealed deep-drawn sheet steel.
  • the steel sheet is copper-plated and tinned for better radiation reduction.
  • the housing has two large side openings that are closed with lids made of the same material.
  • the covers are screwed together in one fold and for better contact with beryllium-copper contact spring strips Mistake.
  • the connecting cables to the printer, monitor and keyboard are routed out of the housing via screw connections with an attached HF chimney made of electrolytic copper. Penetrations that are not used are sealed with electrolytic copper plates of approx. 1.5 mm thickness.
  • the cable entries are made using a known R + S HF connector.
  • the calculation of the HF chimneys, which are intended for all feedthroughs that emit, is given at the end of the description using an example for Hi ⁇ Wel l en '.
  • Mains filter housing made of copper
  • CPU housing made of copper
  • Mass storage housing with front plate made of ordinary sheet metal, but copper and tin-plated
  • Power supply housing made of tinplate galvanized on both sides
  • Ventilation fan f) Signal outputs (plug) for connecting the data cable
  • the line filter housing is made of soldered copper sheet (approx. 1 mm, preferably electrolytic copper). It is screwed to the outer computer housing in a conductive and HF-tight manner.
  • the line filter housing houses a special EMI filter.
  • the EMI filter shuts off the RF signals that are directed towards the outside via the mains cable.
  • the EMI filter principle is known per se, but here a special design takes place, a common-mode suppression takes place via a suitably wound yoke.
  • the filter must therefore be calculated for the respective size.
  • the position of the components is important, as is the physical dimensions. To avoid parasitic capacitances, the capacitors must be at a certain point with the metal wall be glued, which must be determined experimentally for different types of line filter housings in order to achieve damping optimization.
  • the CPU case is made of soldered copper sheet (approx. Lirai, preferably electrolytic copper).
  • the CPU case has a screwed metal sealing lid that can be removed for service purposes.
  • the multiple screw connection is one calculated
  • the CPU housing accommodates the CPU main board and the extensions (plug-in cards) plugged into the main board.
  • the CPU housing is insulated into the outer computer housing by means of six plastic spacers. Signal lines are led out of the CPU housing from openings in the housing wall, which are secured against HF leakage by HF chimneys with inserted HF sealing foam. These lines lead to the connectors on the outer wall of the computer case. (See f)). As mentioned earlier, the example given at the end can be used to calculate the HF chimneys
  • the mass storage case with front panel is built into the computer case from the front.
  • the mass storage case contains: hard disk, floppy disk drive and removable disk drive.
  • the housing is made of sheet steel, which is copper-plated and tinned, and the front plate is milled from full aluminum (preferably approx. 3 mm)
  • the hard disk is built into a sheet steel insert - the hard disk can be removed from the computer after finishing work.
  • the front plate of the insert has a circumferential fold which, when inserted, engages in the front plate of the mass storage housing with a projecting shoulder which dampens the radiation.
  • control openings for the removable disk and the floppy disk drive are designed as HF chimneys.
  • the example given at the end can be used to calculate the HF chimneys.
  • the key switch for keyboard lock and power switch as well as the operating status LEDs and the reset and load switches are built into the front panel.
  • All bushings and passageways, e.g. B. the light-emitting diode holes are designed as HF chimneys.
  • the mass storage housing with front panel is sealed with a circumferential metal cord for better contact.
  • This seal is placed under high mechanical pressure by means of a screw or clamping attachment.
  • This metal cord is a commercial product consisting of conductive rubber and a copper / iron mixture. Since a pressure of several kg / cm 2 is to be achieved, a screw fastening, e.g. B. with M4 or M5 screws, preferred.
  • the power supply housing is a largely closed sheet metal housing made of tinplate galvanized on both sides. It contains the power supply boards and a fan for heat dissipation.
  • the power supply housing is built on top of the CPU housing, so it has an inner potential.
  • the Ohmic resistance at the contact points between the power supply housing and the CPU housing should be as low as possible and care should also be taken to avoid possible corrosion.
  • the direct assembly of the power supply housing on the CPU housing suppresses the radiation at the source, i.e. where the highest currents flow.
  • the direct mounting of the power supply housing on the CPU housing also creates the shortest possible cable routes.
  • the computer outer housing is provided with openings for ventilation of the interior.
  • the breakthroughs are secured with known honeycomb filters against HF radiation leakage.
  • Several built-in fans ensure the circulation of the indoor air.
  • the heat of the CPU inner casing is dissipated to the outside in the exchanger principle.
  • the monitor housing completely encloses the commercially available monitor.
  • a plastic disc with a fine-meshed metal gauze is used.
  • the metal gauze is completely conductively connected to the monitor housing.
  • the metal gauze consists of an iron / copper alloy, with a good conductive Connection of the crossing points of the individual wires must be observed.
  • the mesh size results from the critical wavelength and is preferably less than 1 mm.
  • Mesh size is chosen according to the critical wavelength. So that a color rendering is possible, that is
  • gauze nets made of nylon threads are known as contrasting disks and gauze nets were also used in X-ray technology. Until now, such networks were only useful for black and white images. It is only through the inclination that you get a color-compatible net.
  • a line filter is used to filter out the image information signals of the monitor on the voltage supply line.
  • the inner housing of the line filter results from its embodiment.
  • the line filter solution is generally known.
  • the inner housing ie the monitor housing, is not connected to the outer housing, so that there are two different ground potentials.
  • the mains filter is attached to the outside of the monitor housing so that the largest possible HF separation of the interior is achieved.
  • the individual housing parts are made of specially heat-treated and therefore magnetically significantly improved thin sheet.
  • the sheet is copper-plated and tinned for optimal attenuation of the HF when passing through the housing wall. All housing parts . are screwed together using the tinning as a sealing medium.
  • the sheet metal of the housing parts is about 4 to 5 times better than normal sheets due to the soft annealing.
  • the printer housing which is also made of steamed deep-drawn sheet, preferably copper-plated and tinned, consists of an upper and a lower shell. To operate the printer, the top cover must be opened up.
  • the EMI line filter is flanged from the inside to the rear of the printer housing in a housing.
  • the individual housing parts are preferably copper-plated and tinned.
  • a shielded plastic pane like the one used for the monitor housing, allows a view of the display elements of the printer.
  • a fine metal gauze is inserted into this plastic disc, which is connected to the housing with a low resistance all around by a press frame.
  • an all-round seal is made with beryllium-copper contact spring strips.
  • the two locking levers ensure a high contact pressure on the sealing surfaces.
  • the contact spring strips which represent a mechanical and electrical connection, replace the multiple screw connection, e.g. is used to connect the mass storage enclosure to the front panel.
  • the printer only works when the cover is closed. When the cover is open, the mains voltage supply to the printer is interrupted, so that no compromising radiation can occur;
  • the keyboard is built into an aluminum housing.
  • The. Keycaps of the keyboard can for technical reasons, ie. because of the need for user operation, no further shielding.
  • the HF shielding takes place here through a special layout of the keyboard logic.
  • the keyboard switches are actuated via a plastic bushing that leads through a metal shield plate mounted over the circuit board. This screen plate is preferably a 3-4 mm thick aluminum plate.
  • the cable bushings therefore form HF chimneys themselves.
  • the tube of the cable duct is designed as an HF chimney, which further increases the HF tightness of the connection.
  • All individual parts of the cable duct are made of high quality, i.e. sufficiently hard, electrolytic copper.
  • the contact to the outer housing is again made by several screws that generate high contact pressure 5.
  • the computer outer casing 0 is provided with openings.
  • the breakthroughs are secured with honeycomb filters to prevent HF radiation from escaping.
  • honeycomb filters are generally known.
  • filters made of silver-plated copper are used, which are inserted into the slots in the outer housing.
  • the honeycomb size 5 results from the critical wavelength.
  • the thickness of these filters is approximately 2 cm and the honeycombs are preferably used in a frame, for example 2.5 cm thick.
  • the damping on the device is fundamentally dependent on the housing, since the outer surfaces of the housing are not homogeneous. It can therefore vary from place to place on the housing. With just a few trials, you can determine what is best for a particular device type.
  • the assumed waveguide is approx. 140/10/100 mm (W / H / L).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

Un ordinateur personnel blindé portatif est blindé de manière à rendre impossibles pratiqement toutes lectures ou écoutes non autorisées des données en-dehors de l'espace de travail habituel. A cet effet, le boîtier extérieur de l'ordinateur est composé d'un matériau ferromagnétique à haute perméabilité et tous les composants sont enduits de cuivre, puis d'étain. Une deuxième cage intérieure de Faraday est emboîtée dans ce boîtier extérieur de l'ordinateur et tous les passages forment des conduits amortisseurs de HF.
EP19910906080 1990-03-15 1991-03-15 Ordinateur personnel blinde Ceased EP0472698A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904008335 DE4008335A1 (de) 1990-03-15 1990-03-15 Abgeschirmter pc
DE4008335 1990-03-15

Publications (1)

Publication Number Publication Date
EP0472698A1 true EP0472698A1 (fr) 1992-03-04

Family

ID=6402303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910906080 Ceased EP0472698A1 (fr) 1990-03-15 1991-03-15 Ordinateur personnel blinde

Country Status (4)

Country Link
EP (1) EP0472698A1 (fr)
JP (1) JPH04506283A (fr)
DE (1) DE4008335A1 (fr)
WO (1) WO1991014354A1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4313676A1 (de) * 1993-04-22 1994-10-27 Mannesmann Ag Lichtsetzgerät
US7634529B2 (en) 1996-11-29 2009-12-15 Ellis Iii Frampton E Personal and server computers having microchips with multiple processing units and internal firewalls
US7506020B2 (en) 1996-11-29 2009-03-17 Frampton E Ellis Global network computers
WO2003025725A2 (fr) * 2001-09-17 2003-03-27 Ellis Frampton E Iii Ordinateurs de reseau mondial
US7805756B2 (en) 1996-11-29 2010-09-28 Frampton E Ellis Microchips with inner firewalls, faraday cages, and/or photovoltaic cells
US6725250B1 (en) 1996-11-29 2004-04-20 Ellis, Iii Frampton E. Global network computers
US8225003B2 (en) 1996-11-29 2012-07-17 Ellis Iii Frampton E Computers and microchips with a portion protected by an internal hardware firewall
US7035906B1 (en) 1996-11-29 2006-04-25 Ellis Iii Frampton E Global network computers
US6167428A (en) 1996-11-29 2000-12-26 Ellis; Frampton E. Personal computer microprocessor firewalls for internet distributed processing
US8312529B2 (en) 1996-11-29 2012-11-13 Ellis Frampton E Global network computers
US7926097B2 (en) 1996-11-29 2011-04-12 Ellis Iii Frampton E Computer or microchip protected from the internet by internal hardware
US20050180095A1 (en) 1996-11-29 2005-08-18 Ellis Frampton E. Global network computers
US6136131A (en) * 1998-06-02 2000-10-24 Instrument Specialties Company, Inc. Method of shielding and obtaining access to a component on a printed circuit board
DE69913142T2 (de) * 1998-06-26 2004-06-03 Sagem Denmark A/S Vorrichtung und verfahren zur sicheren informationsverarbeitung
US7490250B2 (en) 2001-10-26 2009-02-10 Lenovo (Singapore) Pte Ltd. Method and system for detecting a tamper event in a trusted computing environment
US8125796B2 (en) 2007-11-21 2012-02-28 Frampton E. Ellis Devices with faraday cages and internal flexibility sipes
US8429735B2 (en) 2010-01-26 2013-04-23 Frampton E. Ellis Method of using one or more secure private networks to actively configure the hardware of a computer or microchip
DE102010031035B3 (de) * 2010-07-07 2012-01-05 Siemens Aktiengesellschaft Gerät mit einem USB-Anschluss
DE102011009432A1 (de) 2011-01-26 2012-07-26 die.spezi(at)listen e.K. Abgeschirmter Computer-Monitor
US10775856B1 (en) 2019-12-02 2020-09-15 Management Services Group, Inc. Compute device housing with layers of electromagnetic interference shields, and devices and systems for the same
CN113655852B (zh) * 2021-08-24 2023-11-17 太原斯利德电子技术有限公司 一种低泄射便携式加固笔记本

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
DE3211758A1 (de) * 1982-03-30 1983-10-06 Siemens Ag Gehaeuse fuer die elektrische nachrichtentechnik
US4785136A (en) * 1986-11-10 1988-11-15 Mollet John R Electromagnetic interference shielding cover
FR2620895A1 (fr) * 1987-09-17 1989-03-24 Besson Eric Caisson de protection d'un appareil informatique
DE8805572U1 (de) * 1988-04-27 1988-06-16 Siemens AG, 1000 Berlin und 8000 München Elektromagnetisch abgeschirmtes Datenverarbeitungsgerät
JPH01292792A (ja) * 1988-05-18 1989-11-27 Mitsubishi Mining & Cement Co Ltd 電子装置
US4890083A (en) * 1988-10-20 1989-12-26 Texas Instruments Incorporated Shielding material and shielded room

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9114354A1 *

Also Published As

Publication number Publication date
DE4008335A1 (de) 1991-09-26
JPH04506283A (ja) 1992-10-29
WO1991014354A1 (fr) 1991-09-19

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