EP0527147A1 - Keyboard, in particular a keyboard for data-processing equipment. - Google Patents
Keyboard, in particular a keyboard for data-processing equipment.Info
- Publication number
- EP0527147A1 EP0527147A1 EP91907744A EP91907744A EP0527147A1 EP 0527147 A1 EP0527147 A1 EP 0527147A1 EP 91907744 A EP91907744 A EP 91907744A EP 91907744 A EP91907744 A EP 91907744A EP 0527147 A1 EP0527147 A1 EP 0527147A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- keyboard
- housing
- key
- underside
- individual
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/004—High frequency adaptation or shielding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/032—Anti-tamper
Definitions
- the invention relates to a keyboard, in particular for electronic data processing devices according to the preamble of claim 1.
- a variety of electronic devices such as. B. screen devices are controlled via a keyboard, which generally consists of a separate, arranged in front of the electronic device keyboard housing, with one or more protruding from the housing operating fields, such as. B. Typewriter key field, in which arranged in columns and rows arranged individual keys or key switches.
- the individual keys or key switches themselves can be soldered onto a common circuit board which is equipped with electronic components, in particular microprocessors.
- Each key switch has one or more meaning, such as. B. letters, numbers or the like.
- Each key switch has one or more meaning, such as. B. letters, numbers or the like.
- Associated with the Key actuation To differentiate between the individual keys, they are coded, for example, in binary signals. About a z. B.
- the actuated key is implemented in a specific binary code, usually using 8 to 10 binary bits in the form of rectangular pulses.
- the function of the individual keys in this bit pattern is clearly assigned to one another. The assignment to each other takes place by means of a microprocessor on the board.
- the microprocessors work e.g. B. with a clock frequency between 1 to 6 MHz, d. H. at 6 MHz a switching process takes place 6 times per microsecond. These switching operations, which run at high switching speeds, cause a high-frequency interference, which the computer or the microprocessor triggers. This results in a spectrum of interference frequencies which, due to the coding and the systematics of the key query, contain information that can be clearly assigned to the characters entered on the keyboard. On the one hand, these disturbances are radiated directly into the air, on the other hand, they are released into the environment as wired disturbances via the keyboard cable and the connected computer.
- a certain shielding of the circuit board accommodating the individual pushbutton switches is achieved by providing a metal frame designed as a flat sheet metal in which the housing of the pushbutton switches are inserted. In this way, the interference level values are already reduced. In practice, however, high-frequency interference can still emerge to such an extent that listening to these frequencies is possible. This can lead to undesired collection of data and information by unauthorized persons.
- a housing for electronic devices has become known, the electromagnetic radiation to the outside and which is shielded against electromagnetic radiation from the outside. This is done by means of two interlocking shell parts made of plastic, which form a kind of double wall. The inner shell part is provided with a metal surface.
- This known embodiment may achieve a significant decrease ', where applicable, to the outside passing electromagnetic radiation. However, it is extremely complex. Furthermore, the consistent implementation of radiation shielding in the area of the button guide was not continued.
- a shielding housing has become known for general use, in which the escape of high-frequency radiation is prevented or at least reduced by providing sharp-angled deflection edges for the HF radiation.
- the emergence of high-frequency radiation from a housing is therefore avoided by a sharp-angled connection or joint or by several abrupt angles.
- the gaps between the housing parts must be kept as small as possible.
- An electrically conductive material such as aluminum, brass or copper is proposed for the known shielding housing.
- the invention has for its object to avoid the disadvantages of known devices in the shielding of high-frequency radiation and in particular to provide a keyboard for electronic display devices in particular, which offers an optimal shielding of RF radiation.
- the keyboard according to the invention should in particular be shielded from the outside in such a way that no detectable and decodable HF frequencies can emerge. If these nevertheless emerge, they should be in an undetectable frequency range.
- the invention has the advantage over known keyboards that it enables extensive and optimal isolation of the RF signals occurring in the keyboard from the outside, i. H. the interference level can be reduced by a value compared to conventional keyboards, so that it comes to lie under the ubiquitous cosmic noise. This means that HF interference frequencies emerging from the keyboard can no longer be analyzed by unauthorized persons.
- the optimal partitioning of the keyboard results from analysis of measured values with known devices.
- FIG. 1 shows a side section through a keyboard according to the invention
- Fig. 2 an end piece to be placed on both end faces for lateral closure.
- FIG. 3 shows a section through a corner area of the housing in the area of detail X in FIG. 2.
- the typing keyboard 1 shown in FIG. 1 for an electronic screen or data processing device • consists of an approximately U-shaped or L-shaped keyboard housing 2 made of aluminum or electrically conductive plastic, with recesses 5 made in the wall 3 of the keyboard top 4 , 6, from which control panels 7, 8 protrude.
- the control panel 7 consists, for example, of pushbuttons 9 arranged in columns and rows, five pushbuttons arranged in a column being shown in FIG. 1.
- the control panel 8 consists, for. B. from a row of push buttons 9 arranged side by side.
- Each key switch 9 consists of its own
- the individual key switches 9 are soldered onto a common circuit board 13.
- the board contains the necessary electronic components, such as. B. Microprocessors 14.
- the components 14 are arranged below the circuit board 13 in FIG. 1. However, they can also be arranged above the circuit board 13 according to the dash-dotted embodiment 14 '.
- the individual pushbutton switches 9 are embedded with their housing 10 in a metal frame 15 designed as a flat sheet metal, which only has the cutouts 16 for gap-free reception of the pushbutton switch housing 10 and is otherwise completely closed.
- the metal frame 15 therefore already represents a kind of shielding of the underlying circuit board 13 towards the top.
- the keyboard housing 2 consists of an extruded aluminum profile with a wall thickness s. of at least approx. 3.0 mm.
- the keyboard housing consists of the keyboard top 4, the rounded short keyboard front 17 and the longer keyboard back 18.
- the extruded profile offers the possibility of extending longitudinal grooves to form for the side end pieces, d. H. generally for attaching further individual parts to the extruded profile.
- the housing wall thickness s is increased to approximately 7 mm.
- these are the area 21 located below or to the left of the control panel 7, the area 22 between the control panel 7 and the control panel 8 and the area 23 above or to the right of the control panel 8
- Areas 21 to 23 with increased wall thickness are threaded strips embedded in the longitudinal grooves 20 in the extruded profile.
- the metal frame 15 can be screwed onto the keyboard housing 2, 4 at short intervals by means of screws, not shown. This connection is made without gaps.
- the frame 15 and the housing opening 5 can be made of an electrically conductive plastic or be provided with a conductive coating.
- all aluminum parts of the housing are coated, which makes the surface electrically conductive and prevents insulating corrosion. This creates large-area, low-resistance contacts on all connections, which are important for damping high-frequency interference.
- the keyboard housing 2 with front 17, top 4 and back 18 is made in one piece over the entire length of the keyboard 1 as an extruded profile, which represents an extremely efficient and flexible manufacture.
- FIG. 2 an end piece 25 is shown, which in the front opening shown in Fig. 1 of the Key housing 2 opposite end can be used.
- 3 shows an associated detail of the connection between end piece 25 and keyboard housing 2 and base plate 30.
- a corresponding mirror-image end piece is to be inserted on the end face into the end face shown in FIG. 1.
- the end piece 25 has a total wall thickness s 3 ⁇ "s - '10 mm and is also made of RF radiation shielding metal, the end piece 25 has circumferential machined surfaces 26 to 28, which, in the keyboard housing 2, 4.. Immerse 17, 18 and form several shoulders there for multiple right-angled RF radiation deflection. Due to the precise manufacture, there may be microfine intermediate gaps. The radiation is always deflected in such a gap, which leads to high attenuation.
- the end pieces 25 are screwed on the screw channels 19 on the keyboard front 17, the keyboard top 4 and the keyboard back 18. In their side view, the two end pieces 25 are matched exactly to the profile of the keyboard housing 2 and are flush with the underside 29 thereof.
- a metallic housing base 30 closing the button housing 2 towards the bottom then only needs to be screwed "from below” onto the threaded strips in the longitudinal grooves 20 in the lower region of the front side 17 and the rear side 18 and into additional bores 31 in the end pieces 25.
- the housing base 30 is sealed by means of an elastic, electrically conductive HF seal 31, the underside of the keyboard housing 2 having corresponding longitudinal cutouts 32 Corresponding recess 33 for inserting the horizontally rotating HF seal 31 is embedded in the underside 34 of each end piece 25.
- FIGS. 2 and 3 the path of the HF radiation with respect to the end piece 25 is shown by arrow 35.
- the HF radiation emerging from the keyboard housing is reduced to a minimum by repeated deflection through the housing structure. Due to the wall sections 38 entering or penetrating into the housing 2, the HF radiation is deflected at right angles along the arrows 39, 40 (see FIGS. 2 and 3).
- the material thickness also contributes to a very large absorption of the radiation.
- the wall thickness s_ of the end piece 25 is " s .- ⁇ 10 mm.
- the immersed wall section 38 has a width s .---- * '6 mm.
- the thickness of the housing in the deflection area is s 5 - **** ⁇ - '7 mm.
- the base plate 30 has a thickness s 6 / -' 2.5 mm.
- the keyboard according to the invention is therefore suitable as a tap-proof keyboard in important areas of use.
- FIG. 3 corresponds in principle to the immersion area of the end piece 25 shown in FIGS. 1 and 2 on the right-hand side of the figure. This is shown in FIG. 2 with "X".
- the in Fig. 2 on the The area “X 1 " shown on the left has the same basic structure.
- the invention is not restricted to the exemplary embodiment described and illustrated. It also encompasses all professional training within the framework of the core concept of the invention.
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Input From Keyboards Or The Like (AREA)
- Push-Button Switches (AREA)
Abstract
On propose un clavier pour appareils électroniques, lequel doit filtrer les signaux HF principalement de l'intérieur vers l'extérieur. A cette fin on a prévu un boîtier métallique, de préférence en un profilé filé d'aluminium (2) dont les deux faces frontales sont fermées au moyen de pièces terminales et dont la face inférieure est fermée au moyen d'une plaque métallique (30). La liaison de l'intérieur vers l'extérieur se fait de telle sorte que l'on prévoit toujours une inversion ou un changement du sens, ce qui amortit suffisamment bien un rayonnement HF pouvant éventuellement pénétrer par la fente la plus étroite.A keyboard for electronic devices is proposed, which should filter the HF signals mainly from the inside to the outside. For this purpose a metal casing is provided, preferably of an extruded aluminum profile (2), the two front faces of which are closed by means of end pieces and the underside of which is closed by means of a metal plate (30 ). The connection from the inside to the outside takes place in such a way that an inversion or a change of direction is always foreseen, which sufficiently dampens any HF radiation which may possibly penetrate through the narrowest slit.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4013819 | 1990-04-30 | ||
DE4013819 | 1990-04-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0527147A1 true EP0527147A1 (en) | 1993-02-17 |
EP0527147B1 EP0527147B1 (en) | 1993-12-15 |
Family
ID=6405414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91907744A Expired - Lifetime EP0527147B1 (en) | 1990-04-30 | 1991-04-17 | Keyboard, in particular a keyboard for data-processing equipment |
Country Status (6)
Country | Link |
---|---|
US (1) | US5359166A (en) |
EP (1) | EP0527147B1 (en) |
JP (1) | JPH05507381A (en) |
DE (1) | DE59100742D1 (en) |
ES (1) | ES2048595T3 (en) |
WO (1) | WO1991017557A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5578802A (en) * | 1995-01-09 | 1996-11-26 | Palmowski; David | Keypad structure including switches with external metal dome like spring operating members |
US6903662B2 (en) * | 2002-09-19 | 2005-06-07 | Ergodex | Computer input device with individually positionable and programmable input members |
US10264336B2 (en) * | 2013-03-21 | 2019-04-16 | Htc Corporation | Electronic device and conductive structure |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3657492A (en) * | 1970-09-25 | 1972-04-18 | Sperry Rand Corp | Keyboard apparatus with moisture proof membrane |
US4056699A (en) * | 1975-11-13 | 1977-11-01 | Essex International, Inc. | Touch plate assembly |
US4303960A (en) * | 1979-12-31 | 1981-12-01 | Gte Products Corporation | Electrostatic discharge-protected switch |
US4336529A (en) * | 1980-02-19 | 1982-06-22 | Pitney Bowes Inc. | Postage meter having shielded keyboard to protect against electromagnetic radiation |
DE3228398C2 (en) * | 1982-07-29 | 1986-06-05 | Siemens AG, 1000 Berlin und 8000 München | HF-proof plug-in module |
DE3319334C1 (en) * | 1983-05-27 | 1984-09-13 | Siemens Ag | Locking device for a two-part keyboard housing |
DE3340749A1 (en) * | 1983-11-10 | 1985-05-23 | Udo Eckhardt | Portable data-acquisition and data-transmission control unit |
FR2571889B1 (en) * | 1984-10-12 | 1988-04-29 | Thomson Csf | CONTROL KEYBOARD WITH ELECTROMAGNETIC PROTECTION AND ELECTRONIC CABINET COMPRISING SUCH A KEYBOARD |
US4689608A (en) * | 1985-01-22 | 1987-08-25 | International Business Machines Corporation | Magnetically snap actuated contact keyboard apparatus |
JPS6257834U (en) * | 1985-09-28 | 1987-04-10 | ||
US4671688A (en) * | 1985-10-02 | 1987-06-09 | Honeywell Inc. | Shielded keyboard |
JPS63164198A (en) * | 1986-12-25 | 1988-07-07 | 三菱電機株式会社 | Electric source switch of personal computer |
US4814566A (en) * | 1987-10-20 | 1989-03-21 | Sigl Edward D | Push-button keyboard assembly with EMI and RFI-shielded multiple individually-replaceable switch modules |
DE8801425U1 (en) * | 1988-02-05 | 1988-03-31 | Hartmann & Braun Ag, 6000 Frankfurt | Desk for holding operating and/or information devices |
US4864077A (en) * | 1988-06-10 | 1989-09-05 | Teradyne, Inc. | Shielded enclosure |
DE8809392U1 (en) * | 1988-07-22 | 1988-09-22 | Siemens AG, 1000 Berlin und 8000 München | Keyboard for communication devices |
GB8825534D0 (en) * | 1988-11-01 | 1988-12-07 | Alcatel Business Systems | Protection of electronic circuits |
-
1991
- 1991-04-17 US US07/968,407 patent/US5359166A/en not_active Expired - Fee Related
- 1991-04-17 JP JP91506752A patent/JPH05507381A/en active Pending
- 1991-04-17 DE DE91907744T patent/DE59100742D1/en not_active Expired - Fee Related
- 1991-04-17 ES ES91907744T patent/ES2048595T3/en not_active Expired - Lifetime
- 1991-04-17 EP EP91907744A patent/EP0527147B1/en not_active Expired - Lifetime
- 1991-04-17 WO PCT/DE1991/000322 patent/WO1991017557A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9117557A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5359166A (en) | 1994-10-25 |
DE59100742D1 (en) | 1994-01-27 |
JPH05507381A (en) | 1993-10-21 |
WO1991017557A1 (en) | 1991-11-14 |
EP0527147B1 (en) | 1993-12-15 |
ES2048595T3 (en) | 1994-03-16 |
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