DE1540488A1 - Fixed resistor and method of its manufacture - Google Patents

Description

5290-65 / A

H. 3249 gas 5

FoV. 983.258

dated July 28, 1964. 1540488

Societl G-erafin SA
MESQCCO, Graubunclen, Switzerland

'Fixed resistor and method of its manufacture

The present invention relates to fixed resistors for electronic circuits, in particular for so-called printed or etched circuits in electronic devices such as radio and television sets. The invention also relates to a method for producing such ") iiüerstänae _e

Electrical resistors generally contain one cylindrical or plate-shaped body on its Ends terminals are attached. In the case of printed or etched circuits, the distance is the Connection points fixed by the grid dimension and is generally about 2.5 mm or a multiple of this Amount · In order to be able to use the ordinary resistors for such printed circuits, it is therefore mostly necessary to bend at least one lead wire of the resistor, if not both so that the ends into corresponding holes in a circuit board fit. This is jjedooli time consuming and inconvenient «

909881 / 0.550

The known resistors are also relatively large and no longer meet modern requirements. In general, they have one or more of the following drawbacks:

a) unsafe contact between the terminals and the bodies that actually "create resistance" made of semi-conductor material; this is based

| especially on the rigidity of the one used for the connection iuetallteiles, by which an impairment of contact can occur;

b) It is difficult to get exact values, so tight tolerances to get, especially when looking for the desired values through a sorting process;

c) the capacity is relatively large and fluctuates as compared to the considerable metal surfaces

'is due to thick resistance body;

otj the self-induction is not insignificant and weak, because the adjustment of the resistance value is often done by a helix cut into the cylindrical body he follows·

The present invention is intended to indicate a fixed resistor, in particular a low-voltage resistor,

^909881/0550 ** oo _me , _NAL

box which largely veriaieaen the disadvantages mentioned above will. The invention also provides a method for the production of such '»idorstands specified, the can be carried out easily and also has the advantage

it

has that ^ was suitable for a Lias mustard activity

In order to reach the '... one side becomes an insulating, plate-shaped or lanielle-shaped carrier with a thin x-etali layer, usually of copper, coated; on part of the other side of the support in the longitudinal direction and puf one of its longitudinal edges sc.'ie cvetl. on part of the first side a thin layer of semiconductor or resistance material is in contact closed with the metal layer; by doing Part of the carrier that is not covered by the semiconductor and resistor material becomes a series of holes e «preferably at the same intervals, a conductive rod "is inserted into each hole, the forms a connection and is at least approximately perpendicular runs to the row of holes, the bars are fixed, E.g. by bending and clamping and also soldered onto the -wetallsehicht j the connection terminals v / ground paax'wise separated from each other, in which the carrier between two consecutive pairs of clamps belonging to one another is cut; the iietail layer

909881/0550 bad original

v.'ird in Z ': at least approximately the same parts connected to the iso-lied carrier in the transverse direction between the two'clamps of a pair; and finally the individual resistances formed in this way are calibrated, combined with a standard *. Compare resistance and its' .iert 4e by changing the length "of the Y / is set iderstsjiässtrecke, 'which is carried out in practice, a part of the V / ider- w supernatant layer by removal of a suitable range until the' ./iderstandewert with the of the normal resistance coincide

"The CIE terminals rods forming earth v / preferably by partially punching out a continuous Lletallstreifens prepared, so that no difficulties _r speeds the desired spacing between the terminals is obtained and a large number of the above Ar. Beitsvorgänge automatically and be performed continuously can without having to completely separate the V / idresistors from the metal strip that carries the connection terminals «

The invention also relates to the novel resistors produced by the method described above, which contain an insulating plate, which can consist, for example, of insulating cardboard or hard paper that is impregnated with an aldehyde resin. the record is on

909881/0550

BAD ORIGfNAL

one side with a d ■ ii-iix η ilet al! layer provided and carried on one part on the other side a layer of a semiconductor or resistance material, which also covers the edge of the plate and makes electrical contact with the metal layer »the latter is divided into two preferably equal parts, which are isolated from each other and both in contact with the resistance layer stand »lüit the two parts. Two parallel connecting wires, strips or small ones are soldered to the metal layer

The i'rfindun ^ is explained in more detail with reference to an embodiment in connection with the drawing ο ils show ϊ

No. 1 is a schematic plan view of one side of a group of '., - ic; purchases according to the "invention, which can be produced by the process _: enä3 cav ürincLung; eir. can;

Figure 2 is a plan view of the other side of one of the Resistors shown in Pigur 1 and

Figure 3 "gives *. A section view in an ibene III-TiT of Figure 2.

0 9881/0550 BAD OHiG.NAL

For the production of ..ic.erstands email of the connection _ö eht nan of a :; Isolierenc en '! rager 1 ... it has the shape of a thin strip and can consist, for example, of cardboard impregnated with a synthetic resin, for example an aldehyde polymer. The side visible in Figure 1 of the carrier 1 is a: r thin metal layer 2 versehc-n, which can also be ordered from ^ ici ^ eise iCuof ^ r β on a.-i part csr length / the length shown in Figure 2 P _A Dar = n other side): it 'jlra.gr.-rε 1 \ v becomes a thin one

Layer 3 made of a semiconductor or ·. r "w'ice ^ s tan; ..material,

graphite

e.g. off, exhausted. This can be any known Ί / eise, beis ^ ielsv / eiie by Aufcjritssn ο ν er laue hen done to whom: the ..iuerstanj '^ öchicjr.t through Diving: - brought in, covered both sides of the ■ 2 contributions in the same way. The liie: erscr. Was based on success from one of the edges of the insulating support and also covers the corresponding longitudinal edge 4 of the support, . so that the ./iderstanc-.sechicr.t contact with the -metall ^ c ^ i 2 .. eight. Lan can be between the Lie tails chic ht 2 and the Resistance layer also provide an additional connection, for example by applying a on silver basis In · that not from the ".» iderstanäsccr.icht Covered part & of the carrier is now formed an even number of holes 5 arranged in a row, which preferably have the same distances from one another. The distance between two consecutive holes is ent

909881/0550

. ■ ;; ri3chg: id .en: fir: en "iu ει-it and provided ver— ■ ·. endun /.- oisreck re-selects _o Im · 11 on.eiiieii wire eggs from Litte to! .. itbe calculated distance Π "i :: c-hen z. ei holes unc · ': -: .. c; it between z ¹ : ti an3cl-luikle never used in perforators: Euen c en grid dimension of a g-cruckten Jchalturu entB_.r-chen ^ _r al60 about 2 _S 5 mm (ocer ge _; evenly falling ^; one Yielfyches of it) be »

A conductor strip is then inserted into each hole 5 -stab 6 introduced, dt.r forms a connection terminal and runs perpendicular to the row of holes. The otabe 6 - / earth taisj.ielcv; iron laid down by Umcie ^ en and permanently pressed on the copper-plated side of the carrier a Lot 7 attached «

To get the desired distance between two

Secure

following terminals 4 ^, these are preferably punched out of a metal strip 8, the other side of the strip in corresponding '"/ Iron is punched out so that a second row of conductive rods 6 is created, which is symmetrical and the simultaneous production of a second Heihe von ', resistance allowed »

To the pairs corresponding to each resistance

■. ■. ■■ r

to be separated from terminals 6 is the Tiäger 1

.909881 / 0550 _BAD ohig.nal

by Sagittarius Ib zv.ieeher z \ ei to successive The clamps belonging to the pairs of lines are cut, as in For 1 it is shown »To connect the two terminals of a ·· "To separate resistance electrically, the with äem iso- - Lierendeii l'carrier 1 connected metal layer 2 zv / icchen the two clamps 6 of each pair in the transverse direction in two at least approximately the same ropes 2a and 2b divided, each make electrical contact with the "Jiderstand-

Whom

s jiiicLt. Liich | o The separation of the metal layer 2 can

3ΜΪ known '/ iron, for example by chemical etching or on mechanical V'ege by grinding or milling ,,

In this way one obtains for each pair of connection terminals 6 a resistor, the value of which is, however, generally not correct »About the resistance value atif to set a desired amount, the resistance must still to be calibrated. This calibration takes place by comparison with an ITormalwid only and after one of the both terminals has been disconnected from the strip.

This operation is generally used for this process the same means as for separating the metal layer £ ΐ8? the two parts 2a, 2b and one forms on the edge lind the side of the resistance layer visible in 3? * gur 2

9Q988T / 0550

a transverse schmelz-like recess 9 "ie the tread line between the dividers 2a and 2b is extended in layers o The length of the recess depends of course on the difference between the original" resistance word and the normal resistance ah. The calibration of the _; ".. resistances are made by extending the resistance circle <>

As with all linear resistors, a coating of varnish can also be applied to protect against moisture, and the resistance value can be changed using a conventional one. CoQe ₅ Z ₀ B ₀ specify a J? Arbcode «, These process steps can be carried out, for example, by diving.

The Viiderstände obtained in this Veise have all the above ervrähnten desirable properties: they have very small spatial dimensions, fixed, accurate and appropriate spacing of the terminals, accurate verte, etc. _o The metal layer has at a V / according to the invention esistance various punctures. Firstly, it serves to radiate heat, since it has a considerable surface. Furthermore, it ensures good contact with the resistance circuit and enables the connection terminals to be simply soldered on at a relatively large distance from the contact between the metal layer and the resistance layer, so that a certain deformation is possible between these two zones. The arrangement of the

909881 / 0-550. .BAD ORIGINAL

_ ₁₀ - 1 5 A 0 A 8 "8

V / iderstandsnaterials, cer Lletallschicht and the lead wires relative to each other allows a calibration of the resistance on the Anochlüscen _£ e_enliberliegenden side.

In order to ensure continuous contact with optimal conditions between the Wiierstanisschicht 3 and the parts 2a and 2b of the conductive layer, t le se at the edge 2c "at Cer Lär ^ skante 4- des idoliersicden Iraqi 1. Machining to be rounded or ar ^ eechrc '^ t, as shown in Figure 3.

The invention is not limited to that shown and described The exemplary embodiment is limited but rather can be modify it in the most varied of ways, 2 “B. with regard to the dimensions of the insulating support, the Ladder and resistance coverings, their thickness and type materials used and the working and 1 self-procedures.

ORlGS _NAi 9 0 9881/0550

Claims (1)

i'iccii-r V / i: r ^ tsnd with an isolate a four-piece layer and two Aiii: chlußkle :: iinen., öa through characterized in that cer insulating Carrier a flatten (1) made of insulating material, e.g. Phenolli £ '-rzkn.rton, whose side with a dumb lethal layer (2) and its other side is provided with a "..i-Terst & wet layer, which also has a (4-) "Covered" and. Electrical. Contact with the metal layer is made by an insulating plate -, - which is divided into ZYv ei preferably four equal parts (2a, 2 ~ b), which are isolated from each other and each with the YiicerstancLsnaterial Eontakt r.:achen _; and that two parallel connecting leads (6) are soldered with the "two files c.er metal cliicht. 2ο Resistance according to claim 1, since by gek. E n η I show η et that the resistance _{layer (3) f is provided} with an incision (9) which extends the dividing line between the "two parts (2a, 2" b ) the metal layer runs and "was formed during a calibration process. 909881/0550 3ο resistor according to claim 1, dac, ti rchge -Ic e ii η ζ calibrate η et that the distance zv / iechen ei en • two connections (6) corresponds to the pitch of a printed or etched circuit _o 4o '.iaerstand according to claim 1, characterized in that - ic e η η ζ e i c h η e t that the one with the contradiction, -schicLt (3) contact-making edge (2c) of the suppurative layer (2) is rounded or beveled. 5. Resistance according to one of the preceding claims, characterized in that the AnichluSkleiunen (6) are soldered (7) to an area of the metal layer (2), v.elcher the contact area zv.iscn-en the - ".. resistance layer (3 ) and the Lie tails ahicht - (2) is opposite. 6 “Method of making an electrical plague resistor according to one of the preceding claims, characterized in that one Side of an insulating, platelet-shaped carrier (1) is coated with a thin metal layer (2); that on part of the length of the other side of the carrier and on one of its longitudinal edges (4) and optionally a thin resistance layer (3) is also applied to part of the first side, which electrically 90988 1/055 0 ^ß AD ORIGINAL -.13 - Contact with the metal layer (2) results in a series of holes (5), preferably arranged at the same mutual spacing, being formed in the part of the carrier which is not coated with the surface layer; that a conductive rod (6) forming a connecting terminal is inserted into each hole and is arranged at least approximately vertically on the row of holes, fixed and soldered to the hole-tight; c.ass ι the An-chluiäklenmen pt-arveite separated from each other ■, grounding by placing the carrier (1) between two adjacent connections belonging to successive pairs. transversely traversed} c.as the i.Ietall: '. chicht (2) zvil between the two Kl? iiJineiii of the soap pairs in zvrei voraugsY / 2ise equal parts (2a, 2b) divided on the carrier i ^ outer - . ird, and that the resulting xicerstands by comparison uit einea lioi-malviid..rstanö. and Γ.ΐι cores of a part (9) 3er ■., iJ.erfj-jcMicU.-hiclit (3) equals rercen. 7ο method according to Aiis__ruch 6, ü α ü urchgek e η η ζ eichnet, ö.ass "the ar.scl: lußkler_.en forming". Parallel, conductive rods (6) by punching out j) rush. A continuous Lietails tr e if ens geoilcet v; erden _o 90988 1/0550 BADORiQiNAL -Blank page