DE2350273A1 - Multiple electrode system for recording equipment - has groups of electrodes each with control part insertable in contact strip - Google Patents

Abstract

The individual plug pins of each contact strip are rigidly connected with the electrode end contacts which are aligned in a row to form a group of electrodes. The plug pins engage in openings in the end contacts and are soldered in place there. An electronic electrode-selection plate is provided on each control part. A control transistor for each electrode is associated with the electrode-selection plate. The greater part of the electrodes is embedded in a plastic plate, the exception being the writing ends of the electrodes and the plug pins of each contact strip. The control parts are secured in their inserted position by a foam cushioned rail and are formed of thin-layer hybrids with miniaturised parts (the transistors) and non-miniaturised parts (the electrode selection plates).

Description

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ROBERT BOSCH GMBH, Stuttgart Multiple electrode arrangement for recording devices

The invention relates to a multiple electrode arrangement for recording devices, in particular based on recording metal paper, with electrodes aligned in a comb shape at their writing end.

The invention is based on the object of a multiple electrode arrangement to create the aforementioned type, which can be contacted easily and safely with a control part; the · overall arrangement should be space-saving and inexpensive.

This object is achieved according to the invention in that the electrodes each have a contacting section and form groups are summarized, each of which is assigned a control part that

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can be inserted into a contact strip, the individual plug tongues of which are fixed on one side with those arranged in a row Contacting sections of the electrodes are connected. Such an arrangement has the advantage that the individual control parts can all be constructed identically and due to the Plug connection with the assigned electrodes of each group can be easily mounted and exchanged.

It has proven to be advantageous if · the plug tongues of the Contact strips through openings in the contact sections grip the electrodes and are soldered to the contacting sections. This is how you get an operationally reliable Contacting, which additionally protects against stronger mechanical loads or external corrosion by a Plastic potting compound can be secured well. In that there is also an electronic electrode selection arrangement on each control unit and a number of control transistors corresponding to the number of electrodes are arranged for the individual electrodes a minimum number of components that can be replaced under the given circumstances is achieved. identical control parts are summarized. To increase the mechanical strength and security against shaking and for protection Against mechanical damage from the outside, it is useful if the control parts are supported by a preferably common, foam-padded Are secured in their inserted position.

Me control parts are expediently designed as thin-film hybrids with miniaturized and non-miniaturized components. The hybrid technology, which is known per se, offers a number of advantages in this application; so in particular / height the control parts can be reduced and the manufacturing cost can be lowered. From a manufacturing point of view, it is beneficial if the following processing steps v / grounding in the order given: First, the conductor tracks are placed on a glass substrate in Thin-film technology, followed by tinning of the

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Connections of the integrated circuit and then the integrated circuit made in plastic, in the so-called

"Beflow soldering" method soldered on; this is a procedure- "where the substrate with a clipboard made of tantalum and an overlying copper layer is immersed in a solder bath, the tin, which later forms the actual conductor tracks, only adheres to the substrate in the area of the copper base. In the Solder points are accumulations of solder, which through Heating by means of a heating plate from the back of the substrate is liquefied when the integrated circuit is soldered on will. After the integrated circuit has been soldered on, SOT-23 transistors are soldered on at in the ratio of about 10: 1 reduced soldering time and at the same time the soldering of a comb-shaped bar with the plug-in contacts of the control unit. Finally, the control part can then be overmolded with plastic or cast in cast resin.

Further details and configurations of the invention are based on of the figures in the following description. Show it:

Fig. 1 is a three-dimensional exploded view of a Multiple electrode arrangement for recording devices,

Pig. 2 shows a three-dimensional representation of a contact strip for a "control part on the one hand and the electrodes on the other hand, and -

Pig. 3 is a plan view of a control part for an electrode group.

In Pig. 1, 10 denotes the ends of electrodes 11, which, with the exception of the area of these writing ends 10, are embedded in plastic which is shaped to form a plate 12. All the writers 10 of the electrodes 11 protrude equally from the Plate 12 and have the same dimensions and the same dimensions

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stand from each other. At the inner end of each electrode embedded in the plastic there is a contacting section 13, each with one Opening-14. Sixteen electrodes and just as many contacting sections are each combined to form a group 15. The openings 14 in the contacting sections belonging to a group 13 lie in a row and are penetrated by connector tongues 16 of a contact strip 17. The plug Tongues 16 are soldered to the contacting sections 13 and together with the contacting sections in the plastic compound the plate 12 embedded.

The contact strips 17 have at their end facing away from the plug tongues 16 formed in one piece with the plug tongues Sockets 18 into which plug pins 19 engage. The facing away from the contact strip 17 ends 20 of Connector pins 19 are soldered to the ends of conductor tracks 21, which belong to a control part 22 and in their base layer are formed in thin-film technology. The conductor tracks 21 run on a glass carrier 23, which is used for reinforcement of the line cross-section of the thin-film conductor tracks is immersed in a solder bath. This way of manufacturing low resistance Conductor tracks made of solder are known per se and need not be discussed in more detail.

Zu.jedem control section 22 includes a power selection electrode assembly 24 and a corresponding number of the electrode number of drive transistors 25 for the individual electrodes, the driving transistors .25 amplify the of the electrical

The multiple electrode arrangement according to the invention is intended for recording devices, in particular based on recording metal paper . In the area of their writers 10, the individual electrodes 11 are aligned in a comb shape and burn out individual points from the metal recording paper, which are used both for analog recording when the paper is ported over the electrodes

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as well as composed for the expression of alphanumeric characters can be. . · ■ '".

A control part 22 is assigned to each group 15 of 16 electrodes each, which as a thin-film hybrid with miniaturized components - the control transistors 25 - and with non-miniaturized ones Components, - the electrode selection arrangement. 24 - are trained. The control transistors 25 ″ have no metallic housing, but the individual elements are each covered with a small amount of plastic for protection. The three connections of each transistor 25 are brought out in one plane and with the associated sections of the line. terbahnen 21 electrically and mechanically connected by soldering. The electrode selection arrangement 24 is also seated directly on the conductor tracks 21; it contains an integrated circuit that contacted directly on the conductor tracks 21 and arranged protected in a flat plastic housing 26.

The individual control parts 22 are inserted plane-parallel to one another into the contact strips 17, so that a very compact and compact design of the multiple electrode assembly results. For mechanical protection, the control parts 22 are through a foam-padded rail 27 secured in its inserted position. This rail 27 rests on with little pressure the adjacent end faces of the glass carriers 23 so that they can easily be inserted into the foam padding of the rail 27 and in this way additionally protect against mechanical impact " rivers are protected. The foam padding of the rail 27 is indicated at 28. The rail 27 is releasably fastened to the plate 12, for example by two screws (not shown).

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The electrode selection arrangement 24 receives binary input signals and has 16 outputs to the individual electrodes in a group. Because of the decoding of the binary input signals in the output system, which is occupied by 16 electrodes, the elec-

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electrode selection arrangement also as a decoding system. The one labeled 24 " Module 'thus determines which of the electrodes 11 of the group 15 assigned to it with a voltage to burn out a registration metal paper is applied.

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Claims (10)

Robert Bosch GmbH R. 1 7 8 4 Stuttgart • Claims M. Multiple electrode arrangement for recording devices, in particular on Reglstriermetallpapierbasis, with on hers Writing 'comb-shaped electrodes, thereby characterized in that the electrodes (11) each have a contacting section (13) and combined into groups (15) are each assigned a control part (22), which can be inserted into a contact strip (17) whose individual connector tongues (16) fixed on one side to the contacting sections (13) of the Electrodes (11) of a group (15) are connected. 2. Electrode arrangement according to claim 1, characterized in that that the plug tongues (16) of the contact strips (17) through openings (14) in the contacting sections (13) * ' the electrodes (.11) and at the contacting tabs sections are soldered on. 3. Electrode arrangement according to claim 1 or 2 _S, characterized in that on, spring control part (22) an electronic electrode selection arrangement (24) and a number of control transistors (25) corresponding to the number of electrodes are arranged for the individual electrodes. ■ - 8 ^ 09816/0514 _ 8 _ 178 ί 4 «electrode arrangement according to one of claims 1 to 3» thereby characterized in that the electrodes (11) with the exception of the area of their writing ends (10) and those on the contacting sections (15) fastened plug tongues (16) of the contact strips (17) in a plastic plate (12) • are embedded. 5. Electrode arrangement according to one of the preceding claims, characterized in that the control parts (22) by a preferably foam-padded rail (27) in their inserted position are secured. 6. Electrode arrangement according to one of the preceding claims, characterized in that the control parts (22) are thin-layer hybrids with miniaturized (25) and non-miniature » ized (24) components are formed. 7 * electrode arrangement according to one of the preceding claims, characterized in that the conductor tracks (21) of the control parts (22) are formed using thin-film technology. 8. Electrode arrangement according to one of the preceding claims, characterized in that the control transistors (25) are encased in plastic without a metallic G housing and have three connections led out in one plane. 5.09816705U 17 8 4 - 9 - 9. Electrode arrangement according to one of the preceding claims, characterized in that the electrode selection arrangement (24) contacted a directly on the conductor tracks (21), Integrated circuit contained in a flat plastic case (26) sits. . 10. Electrode arrangement according to one of the preceding claims, characterized in that the control parts (22) each on a glass carrier (23) are constructed. S09816 / 05U - no Blank page