EP0055246B1 - Sous-main antistatique - Google Patents

Sous-main antistatique Download PDF

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Publication number
EP0055246B1
EP0055246B1 EP81890203A EP81890203A EP0055246B1 EP 0055246 B1 EP0055246 B1 EP 0055246B1 EP 81890203 A EP81890203 A EP 81890203A EP 81890203 A EP81890203 A EP 81890203A EP 0055246 B1 EP0055246 B1 EP 0055246B1
Authority
EP
European Patent Office
Prior art keywords
antistatic
recesses
base according
antistatic base
base
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.)
Expired
Application number
EP81890203A
Other languages
German (de)
English (en)
Other versions
EP0055246A1 (fr
Inventor
Kurt Dipl.-Ing. Waniek
Heinz Tichy
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.)
Semperit AG Holding
Original Assignee
Semperit AG Holding
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 Semperit AG Holding filed Critical Semperit AG Holding
Publication of EP0055246A1 publication Critical patent/EP0055246A1/fr
Application granted granted Critical
Publication of EP0055246B1 publication Critical patent/EP0055246B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L3/00—Writing or drawing underlays, e.g. blotting pads
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y10T428/24537—Parallel ribs and/or grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves

Definitions

  • the present invention relates to an antistatic base for manipulation with electronic components workplaces made of a rubber layer with a specific volume resistance (according to DIN 53482) of at least 10 2 ücm.
  • Damage to electronic components due to the influence of electrostatic charges is a problem that increases with the sensitivity of these components. Of particular importance is the high capacity which the human being represents. Values up to 4000 pF have already been measured, with the average being around 200 pF. Friction on clothing, the floor, the seat and the like results in electrostatic charging of the body, which can reach peak voltages of 6,000 V. The discharge of these voltages via an electronic component can lead to its destruction, whereby the damage does not have to be immediately noticeable, but can be a considerable impairment of the service life.
  • CMOS circuits because their insulated control electrode (gate) has a high impedance and has a capacitive effect on the flow of the current.
  • Such circuits have a very thin dielectric film which is suitable for recording an undesired charge state, and if a critical limit is exceeded, the dielectric breaks down to ground potential.
  • Many other electronic components are also highly sensitive to antistatic charges.
  • flooring mats are also used, which are intended to ground everyone who comes close to the workplace.
  • the known antistatic underlays have a multilayer structure, the top layer consisting of a mass-conductive plastic material. Underneath there is a highly conductive intermediate layer, for example in the form of a network of carbon fibers. Finally, there is a foam layer underneath for greater comfort and an underside made of non-slip material.
  • this known pad can achieve the desired effect of dissipating antistatic charges, it is relatively uneconomical due to its complicated structure.
  • the temperature resistance of the plastic material used in the top layer is not sufficient to avoid injuries to this layer, for example in the event of accidental contact with a soldering iron.
  • the highly conductive intermediate layer is exposed, which can not only lead to undesirable short-circuits of the manipulated parts, but also represents a certain risk of danger if bare conductor parts come into contact with it.
  • the present invention therefore has set itself the goal of creating an antistatic pad that 100% satisfies from the standpoint of electrical safety, causes a safe discharge of electrical charges from antistatic bodies, which is non-slip and which always a clean work surface even after prolonged use represents.
  • an antistatic base of the type described at the outset in that at least part of the top of the base has preferably regularly distributed depressions, the extent of which in the plan is at least 8 mm, preferably at least 10 mm, and the others in at least one direction Dimensions and relative distances from one another are selected such that the waste wire pieces with the maximum length come to lie in the depressions without protruding from them.
  • This formation of an antistatic pad fulfills the task outlined above in all respects.
  • This configuration of the surface of the antistatic base due to the surface structuring through the depressions, provides a good possibility of contact with parts placed thereon.
  • electronic components are often packed in conductive bags, which also become electrostatically charged during transport to the work surface. It has to take care of it be carried that this charge is derived when the bags are placed on the base. This can happen particularly quickly with a pad according to the invention, since the contact resistance z. B. can be kept low from the pad to the sachet.
  • the antistatic pad is grounded, otherwise the charges could not flow off.
  • a Erdurigssciiiene is provided on the wall adjacent to the workplace or on the floor, to which the documents are connected in an electrically conductive manner at the workplace and possibly on the floor.
  • conductive handbands are used, which are conductively connected to the base, which is located at the workplace, via a suitable connection, for example a push button or a frog clamp.
  • the pieces of wire produced as waste have a maximum length of about 8 mm, so that they have space in the recess in any case.
  • the depressions should be distributed at least over the part of the upper side that is used for work, whereby the distances should not be too large.
  • a not insignificant safety advantage of the antistatic pad made of rubber according to the invention is achieved in that, in contrast to the known plastic pads, it can also be equipped with excellent fire protection.
  • the fire risk can be largely minimized by adding suitable fire protection agents to rubber and choosing suitable rubber formulations. The risk of fire as a result of negligent handling of the soldering iron can thus be eliminated.
  • the depth of the depressions can expediently be 2 to 5 mm, preferably 3 to 4 mm. This depth of the depressions ensures that the waste pieces of wire come to rest in the depressions, and even an inclined position of these pieces of wire does not yet result in protruding from the depressions and thus into the work area. With this dimensioning of the reinforcements, it is also expedient that the depressions can be used during work to fix some components, thereby effectively preventing accidental wiping away by the operator's hand movements.
  • the web width of the material between the depressions is 1 to 5 mm.
  • the average length of these pieces of wire then tilts these pieces of wire into the depressions, so that the desired effect of keeping the actual work surface free of impurities can be achieved.
  • the depressions are designed in the form of a parallelogram.
  • the long axis of the parallelogram can be oriented approximately parallel to the edge of the workplace, which the operator faces, so that the pieces of wire usually fall in this direction of the depressions.
  • the parallelograms are arranged with their shorter axes away from the operator, as a result of which a more compact surface is formed in this direction.
  • a further expedient embodiment of the invention provides that the depressions in the plan have a preferably three-sided uniform thickness profile. Uniform thickness profiles are characterized in that their chords leading through the center point, like the diameter of circles, are all of the same length. In the case of a constant-thickness cross-section, it does not matter in which direction the pieces of wire fall down: in any case, they get into the recess in the correct orientation.
  • the antistatic pad may be connected to a grounding bar via frog clamps.
  • An appropriate attachment of the frog clamp is possible if the base has a thickening on at least one side along the edge. The frog clamp can then be clamped via this thickening.
  • the thickening also acts as a barrier against parts falling off the base, which is also a desired effect.
  • An analogous effect can also be achieved if the base has a groove on at least one side along the edge. The groove also serves to catch parts that could otherwise be touched by the surface.
  • the base has depressions only on its upper side, while the lower side is essentially smooth and, at best, has a design which improves its slip resistance.
  • the base can be turned over in the event of manipulations, where this seems at best desirable, so that its essentially smooth underside becomes the top.
  • the top and bottom of the base have depressions.
  • An antistatic pad according to the present invention has a surface resistance, measured according to DIN 53596, of at most 1010 a. This resistance characteristic ensures that there is always essentially the same potential on the entire surface of the base, which also applies to the electronic components deposited at different locations on the antistatic base.
  • FIG. 1 shows a top view of a base
  • FIG. 2 shows a section of a top view
  • FIGS. 3 and 4 show cross sections through partial areas.
  • a base 1 which has essentially square depressions 2 in plan. Along the edge, the base 1 has a thickening 5, over which a frog clamp can be placed at a suitable point (not shown), which brings about the conductive connection 8 to an earth line.
  • the recesses of the base 1 can have any desired geometric shape in plan.
  • Fig. 2 a section of a base 1 is shown, the recesses 3 having the shape of a three-sided thickness in plan. As mentioned above, this design ensures that it does not matter in which direction falling pieces of wire fall into the recess, since they have the same diameter in every direction.
  • FIG 3 shows a partial area of a base 1 in cross section. It can be seen that the depressions 4 are separated by webs 6. The walls of the webs 6 fall to the bottom of the recess 4 in a concavely curved manner, which facilitates slipping in of pieces of wire. The bevelling of the walls of the web 6 can also be flatter and depends on the special requirements of the respective work station.
  • FIG. 4 shows a section of an edge area cross section of a base 1.
  • edge thickening 5 which is approximately elliptical in cross section.
  • the thickening 5 is used, among other things, for connecting a frog clamp for the grounding conductor and for the conductive bracelet.

Landscapes

  • Elimination Of Static Electricity (AREA)

Claims (10)

1. Base antistatique pour la manipulation, comportant des postes de travail servant à des composants 'électroniques, constituée par une couche de caoutchouc (1), possédant une résistance intérieure spécifique (suivant la norme DIN 53482) d'au moins 102 Ωcrn, caractérisée par le fait qu'au moins une partie de la face supérieure de la base comporte des renfoncements (2, 3, 4), de préférence répartis régulièrement, dont la dimension du contour dans au moins une direction est égale à au moins 8 mm, de préférence au moins 10 mm, et que leurs autres dimensions et distances relatives les unes par rapport aux autres sont choisies de manière qu'également les morceaux de fil de rebut de longueur maximale viennent se placer dans les renfoncements sans faire saillie hors de ceux-ci.
2. Base antistatique suivant la revendication 1, caractérisée par le fait que la profondeur des renfoncements est comprise entre environ 2 et 5 mm, de préférence entre 3 et 4 mm.
3. Base antistatique suivant la revendication 1 ou 2, caractérisée par le fait que la largeur des parties pleines du matériau (11) entre les renfoncements est comprise entre environ 1 et 5 mm.
4. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait que les renfoncements s'élargissent vers l'extérieur à la manière d'une cuvette.
5. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait que les renfoncements ont une forme de parallélogramme, en ce qui concerne leur contour.
6. Base antistatique suivant l'une quelconque des revendications 1 à 4, caractérisée par le fait que les renfoncements possèdent de préférence un contour de forme générale triangulaire et d'épaisseur constante.
7. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait qu'elle comporte un épaississement (5) le long du bord, au niveau d'au moins un côté.
8. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait qu'elle comporte une rainure (7) le long du bord, au niveau d'au moins un côté.
9. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait que les faces supérieure et inférieure de la base comportent des renfoncements.
10. Base antistatique suivant l'une quelconque des revendications précédentes, caractérisée par le fait qu'elle possède une résistance superficielle, mesurée suivant la norme DIN 53596, d'au maximum 10 S2.
EP81890203A 1980-12-22 1981-12-18 Sous-main antistatique Expired EP0055246B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0624080A AT388482B (de) 1980-12-22 1980-12-22 Antistatische unterlage
AT6240/80 1980-12-22

Publications (2)

Publication Number Publication Date
EP0055246A1 EP0055246A1 (fr) 1982-06-30
EP0055246B1 true EP0055246B1 (fr) 1984-05-02

Family

ID=3584298

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82900002A Pending EP0067829A1 (fr) 1980-12-22 1981-12-18 Sous-main antistatique
EP81890203A Expired EP0055246B1 (fr) 1980-12-22 1981-12-18 Sous-main antistatique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82900002A Pending EP0067829A1 (fr) 1980-12-22 1981-12-18 Sous-main antistatique

Country Status (6)

Country Link
US (1) US4513046A (fr)
EP (2) EP0067829A1 (fr)
AT (1) AT388482B (fr)
DD (1) DD201950A5 (fr)
DE (1) DE3110158A1 (fr)
WO (1) WO1982002315A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512371A1 (de) * 2011-12-28 2013-07-15 Irrgeher Hannes Zeichenunterlage für eine auflage, insbesondere für ein papierblatt

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217253C2 (de) * 1992-05-25 2003-03-27 Minnesota Mining & Mfg Vorrichtung zum Verbinden einer leitfähigen Schicht mit einer Erdungsleitung zur Ableitung elektrostatischer Ladungen
US5691875A (en) * 1994-09-23 1997-11-25 Lucent Technologies Inc. Systems for preventing electrostatic accumulation
US6138858A (en) * 1998-04-29 2000-10-31 Gateway 2000, Inc. Portable tote with assembly surface
WO2008083002A1 (fr) * 2006-12-26 2008-07-10 Fujifilm Dimatix, Inc. Système d'impression pourvu d'un élément conducteur

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20924A (en) * 1858-07-13 Improvement in cooling car-wheels
GB427914A (en) * 1933-05-26 1935-05-02 Josef Grabec Sheet materials
AT150118B (de) * 1934-08-25 1937-07-10 Adalbert Ledofsky Elastisch dehnbarer Textilstoff.
US2032935A (en) * 1934-11-28 1936-03-03 Us Rubber Co Rubber film or sheet
US2449465A (en) * 1946-09-23 1948-09-14 Jacob E Flaker Floor mat
GB619168A (en) * 1946-11-23 1949-03-04 Dunlop Rubber Co Resilient mountings
GB717397A (en) * 1951-10-04 1954-10-27 Inc Luciano Valentini & Co Method of manufacturing mats of rubber derivatives
DE1530494A1 (de) * 1965-08-05 1969-10-02 Continental Gummi Werke Ag Fussmatte,insbesondere zur Benutzung in Kraftfahrzeugen
BE754148A (fr) * 1969-08-05 1970-12-31 Dupol Rubbermaid Gmbh Natte de sol a alveoles
US3832598A (en) * 1972-10-02 1974-08-27 Minnesota Mining & Mfg Electrically conductive tape device
AT325093B (de) * 1973-01-26 1975-10-10 Staerk Erwin Trittbahn
FR2328431A1 (fr) * 1975-10-22 1977-05-20 Dauphant Ets Tapis de sol, notamment pour les vehicules automobiles
US4139138A (en) * 1977-04-07 1979-02-13 Besselman Jr Charles W Solder tray
DE2854385C2 (de) * 1978-12-16 1982-04-15 Preh, Elektrofeinmechanische Werke, Jakob Preh, Nachf. Gmbh & Co, 8740 Bad Neustadt Gedruckte Schaltung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512371A1 (de) * 2011-12-28 2013-07-15 Irrgeher Hannes Zeichenunterlage für eine auflage, insbesondere für ein papierblatt
AT512371B1 (de) * 2011-12-28 2014-02-15 Irrgeher Hannes Zeichenunterlage für eine auflage, insbesondere für ein papierblatt

Also Published As

Publication number Publication date
ATA624080A (de) 1988-11-15
WO1982002315A1 (fr) 1982-07-08
EP0055246A1 (fr) 1982-06-30
AT388482B (de) 1989-06-26
DE3110158C2 (fr) 1990-02-15
EP0067829A1 (fr) 1982-12-29
DD201950A5 (de) 1983-08-17
DE3110158A1 (de) 1982-07-22
US4513046A (en) 1985-04-23

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