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 volume resistance (according to DIN 53482) of at least 10 2 ⁇ cm.
• 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. Verte up to 4,000 pF have already been measured, with an average of 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 need not 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 antistatic highly sensitive.
• the workrooms are supplied with ionized air so that electrical charges can be neutralized
• 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 injure this layer For example, to avoid accidental contact with a soldering iron.
• bpi burning through the upper layer will expose the highly conductive intermediate layer, which can not only lead to undesired 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 has therefore
• the aim is to create an antistatic pad that is 100% satisfactory from the point of view of electrical safety, that safely discharges electrical charges from antistatically charged bodies, that is non-slip and that always provides a clean work surface even after prolonged use.
• an antistatic base of the type described in the introduction in that at least part of the top of the base, preferably has regularly distributed depressions, the extent of which in the plan is at least in one direction 8 mm, preferably at least 10 mm.
• This formation of an antistatic underlay fulfills the task described 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. Care must be taken to ensure that this charge is discharged when the sacks are placed on the surface. This can be done particularly quickly with a base according to the invention, since the transition resistance, e.g. from the pad to the sachet can be kept low.
• the antistatic pad is grounded, otherwise the charges could not flow off.
• a grounding rail is provided on the vand adjoining the work station or on the floor, to which the documents are connected in an electrically conductive manner at the work station and possibly on the floor.
• conductive hand straps are used, which are attached to the base at the workplace via a suitable connection, for example a push button or a frog clamp. is conductively connected.
• 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 base made of rubber according to the invention is achieved in that, in contrast to known plastic bases, it can also be equipped with excellent fire protection.
• suitable fire protection agents to rubber and Vahl suitable rubber formulations, the fire risk can be largely minimized. 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 scrap pieces of wire come to lie 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. In order to avoid that the mentioned pieces of wire remain on the webs between the depressions, it is advantageous if 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 operating person, 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. Thick profiles are thereby characterized in that their tendons leading through the center, like in circles the diameters, are all of equal length. In the case of a constant-thickness cross-section, it does not matter in which direction the pieces of wire fall: they always get into the recess in the correct orientation.
• the pad is connected to a grounding rail via frog clamps.
• the frog clamp can be attached 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 underlay has depressions only on its upper side, while the underside is essentially smooth and at best has a design which improves its slip resistance.
• the underside In the case of such a formation of a base, it can be turned over in the case of manipulations, where this seems at best desirable, so that its essentially smooth underside becomes the top.
• the top and bottom sides of the base have depressions.
• this has a surface resistance, measured according to DIN 53596, of at most 10 10 ⁇ . 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 (not shown) can be placed at a suitable point, which causes the conductive connection to an earth line.
• the recesses of the base 1 can have any desired geometrical shape in plan.
• Fig. 2 a section of a base 1 is shown, the recesses 3 having the shape of a three-sided constant thickness in plan. As mentioned above, this design ensures that it does not matter in which direction falling pieces of wire fall into the depression, 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 encourages the insertion of pieces of wire. The beveling of the walls of the web 6 can also be flatter and calibrates according to the special requirements of the respective workplace.
• FIG. 4 shows a section of a cross-sectional area of an edge area of a base 1.
• edge thickening 5 which is approximately elliptical in cross section.
• the thickening 5 is used, among other things, to connect a frog clamp for the grounding conductor and for the conductive bracelet.

Landscapes

• Elimination Of Static Electricity (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3584298

Family Applications (2)

Family Applications After (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (15)

• 1980
  • 1980-12-22 AT AT0624080A patent/AT388482B/de active
• 1981
  • 1981-03-16 DE DE19813110158 patent/DE3110158A1/de active Granted
  • 1981-12-18 US US06/406,238 patent/US4513046A/en not_active Expired - Fee Related
  • 1981-12-18 WO PCT/AT1981/000032 patent/WO1982002315A1/en not_active Application Discontinuation
  • 1981-12-18 EP EP82900002A patent/EP0067829A1/de active Pending
  • 1981-12-18 EP EP81890203A patent/EP0055246B1/de not_active Expired
  • 1981-12-21 DD DD81235990A patent/DD201950A5/de unknown

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events