DE7146448U - STRIP FRAME FOR USE IN THE ENCLOSURE OF INTEGRATED CIRCUITS IN PLASTIC ENCLOSURES - Google Patents

Description

Strip frame for use in locking in integrated circuits in plastic packaging Priority: August 25, 1971;

Italy; No. 22556 B / 71

The innovation relates to one made of sheet metal Strip frame for use in the encapsulation of integrated Circuits in plastic housing, in the strip conductor for connecting the integrated circuit and cooling fins are formed.

Known strip frames of this type have a maximum of ten conductors and the cooling fins can be left free in the air when mounted on a printed circuit board, or bent over and attached to the printed circuit board will.

According to the present innovation, a strip frame of the type mentioned above is characterized in that the strip frame on both sides of an axis of symmetry, that of the longitudinal direction

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Postal check 54782

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to end up
/ The axis of symmetry of the plate housing, each having a central cooling rib, so that on both sides of each artificial rib there are three outer rings, of which the two outer ladder strips each form a widened part, the widening being in a seal parallel to the axis of symmetry mentioned and to extend only in the direction of the central conductor strips, that each cooling fin extends in its width from the immediate vicinity of the one group of three of conductor strips to the immediate vicinity of the other group of three of conductor strips and extends in its length to the end of the strip frame and there: The conductor strips are connected to one another at the end opposite the seat of the integrated circuit by a connecting strip which narrows immediately before it joins the end of the cow rib.

Fei de 'new.? According to the η width frame, the Advantage, there: be: gieicner .bange of the strip frame ns one ^ r-.? · '. arguing re number of conductors, namely total ZW? If. Since '»rstrei'en, is provided. Furthermore, the Kumrippen g- ^ next ^ end wide, so that they are for the purpose of fastening can be perforated on a -lujsren .heat dissipation body, unj di-3 iLuh_rippen sinn g '-' niigena long in order to attach aes housing to a printed circuit an offset of the conductor strips to allow, being between the conductor strips and leave the cooling fins a fully adequate gap: bt. Dadurcr. wira the Gefanr \ cn short circuits while covering the printed circuit board with conductor banners michilie of a lbtbath diminished.

An exemplary embodiment of the innovation Wj.rd below in Explained in connection with the accompanying figures. From the figures show:

ACE 2980

FIG. 1 shows a strip frame according to the invention;

Figures 2, 3 and 4 views of a finished component,

which by encapsulation using the innovation according to Stripe frame ns is created; and

FIG. 5 shows the drilling template, according to the printed version Circuit board bores must be made to accommodate the component of Figures 2, 3 and 4 to assemble.

The strip frame is produced from a copper _{tape of width I 2,} for example by etching or cutting out, and a length 1 of the copper tape is assigned to each individual housing. The dimensions I ^ and I ₂ and due to the properties of the encapsulation devices used.

On each side of the axis of symmetry AA, which is the longitudinal axis of the finished housing, the frame has a cooling rib 1, which forms an extension of the seat I ^{1 of} the integrated circuit, and two groups of three conductor strips 2. The outermost conductor strip of each group of three is separated from the edge strip IO, which has the positioning hole 11, by a narrow elongated hole 3.

The two outer conductor strips of each group of three have widenings 4, which serve as stops when they are placed on the printed circuit, only on the side facing the middle conductor strip. It is thus possible to obtain a maximum width for the cooling fin _{with a width I 2} provided for the frame and a distance d between the individual conductor strips, which is necessary for correct electrical and mechanical behavior of the leather strips. The distance d is 2.54 mm.

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The cooling fin 1 goes from a width a ^ (3.6 mm), which it has at the seat 1 'of the integrated circuit, to a width ag (6.27 mm), which covers the entire available space between the two groups of strips of strip conductors exploits.

The cooling fin 1 extends bia to the section line 6 in the vicinity of the axis a-a, which defines the frame of the device limited, while the section of the conductor strips at the constrictions 5 is provided. These constrictions 5 are set back by a certain distance from the transverse strip 12, the conductor strips and the cooling fin connects with each other. The transverse strip 12 narrows in the vicinity of the cooling fin and takes one with the there Requirements of the cutting process can still be agreed miniiasle width b (0.5 mm).

After being eliminated, the conductor strips are therefore shorter than the cooling fin, what ι. η bending the cooling fin and the conductor strip allows the latter to be alternately offset on a printed circuit board and the cooling fin at a distance from the conductor strips in the printed circuit board 14 (Figure 4) is anchored, which is sufficient to short circuits during the application of the conductor tracks using a To prevent solder bath.

The cooling fins can have holes ν. ie about the dash-dotted line Hole 8 to allow an anchoring of an outer heat dissipation body to the cooling fins.

Figures 2 and 3 show a side view and a plan view from above of the using the innovation according to the invention Plastic housing made of strip frame, wherein

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the cooling fins and the conductor strips have already been removed are.

Figure 4 shows a front view on the same plastic housing, Whereby the ladder strips 1 and aie cooling fins are mounted on a printed formwork panel 14.

The twelve holes 9 shown in Figure 5 are intended to accommodate the conductor strips of the plastic housing, while the elongated holes 13 the ι;., η of the cooling fins ought to take up. The characters b. ,, b ^, b, have the following values:

b ₁ * 5.08 mm, bp ■ 10.16 mm, b, »16.6 mm. The distance between an elongated hole and the nearest yoke is not less than the distance between two adjacent holes. As in FIG. 1, the letter d indicates the distance between adjacent conductor strips.

Claim to protection

Claims (1)

aCE ^ 980 Müncnen, aen 7 December 1971 "Dr. H. K./fr chut ζ β η s ρ ruc η strip frame made of sheet metal for use in de: ¹ encapsulation of integrated circuits in plastic housing, in which strip conductors for connecting the integrated circuit and cooling fins are formed, characterized in that the strip frame has an axis of symmetry (AA) on both sides, that of the longitudinal axis The axis of symmetry of the plastic housing corresponds to each having a centrally sold cooling rib (i) that three leather strips (2) are arranged on both sides of each cooling rib (l), of which two outer conductor strips (2) each have a widened part, v / obei the widening extends in a direction parallel to the axis of symmetry (AA) mentioned above and only in the direction of the central conductor strip (2) so that each cooling fin (l) extends in width from the immediate vicinity of one group of three conductor strips (2) to the immediate Near the other group of three of ladder strips extends and extends in length up to Extends the end of the strip frame and that the conductor strips (2) are connected to one another at their end opposite the seat (1 ') of the integrated formwork by a connecting strip (12) which narrows immediately before it merges with the end of the cooling fin.