FR2536216A1 - PRINTED CIRCUIT BOARD CONNECTION SYSTEM - Google Patents

Abstract

THE SYSTEM OF THE INVENTION PROVIDES FOR THE REMOVABLE MOUNTING AND ELECTRICAL CONNECTION OF A SET OF GIRLS 'PRINTED CIRCUIT BOARDS12 ON A MOTHERBOARD14. THE GIRLS 'CARDS ARE CONNECTED TO OMNIBUS BARS16, 17 WHICH ARE MOUNTED ON THE MOTHERBOARD ON THE SAME SIDE AS THE GIRLS' CARDS. THE CONNECTIONS BETWEEN THE GIRLS CARDS AND THE OMNIBUS BARS ARE PROVIDED BY FEMALE CONNECTORS18 WHICH ARE MOUNTED ON THE GIRLS CARDS AND WHICH FIT ON THE MALES20 PARTS OF THE RESPECTIVE OMNIBUS BARS.

Description

1.

CARD CONNECTION SYSTEM

PRINTED CIRCUIT BOARD

  the present invention relates to systems for

  intended for the removable mounting of a set of circuit cards

  cooked girls print on a motherboard.

  Motherboards are circuit boards im-

  award winning or metal plates on the upper side of the

  which of the "daughter" printed circuit boards are removably mounted, perpendicular to the motherboards, to allow easy removal and replacement, while the circuit is still energized A means for

  electrically connect daughter cards to other cards

  your daughters, on the motherboard and other circuits, consis-

  te to establish metallized surface parts near the

  edges of the daughter cards and insert them between the

  fork-shaped tacts of electrical connectors that are attached to the motherboard Another way to establish a

  electrical connection with daughter cards consists of using

  read pin connectors and receptacles The connectors

  Torers attached to the motherboard often have connector pins

  connectors that extend from the underside of the motherboard to receive wires connecting

  selected pairs of pins, and bus bars are-

  often connected to a row of connector pins

  under the motherboard, to distribute the voltage to a set

  ble of pins These connections with daughter boards are

  typically designed to convey

  relatively low rants; therefore, a large number of contacts are connected in parallel when currents

high are necessary.

  We discovered that we could save space and ensure a better electrical connection between the components on the daughter boards and the bus bars, to achieve reduced resistance for current and Q to increased reliability, by mounting the bus bar of the m 8 me side of the motherboard as the daughter cards, and by equipping the daughter cards with contacts which adapt directly to

  contact parts on the bus bars In mo-

  preferred embodiments, the contact parts of the bus bars comprise a male part which extends in

  the direction of the length of the bus bar and trans-

  versally with respect to the motherboard; the daughter card contacts have forks intended to come into contact with the male part, and a daughter card has more than one fork contact for connection to a single bus bar, in order to provide increased current routing capacity In one embodiment, the bus bar is connected to the motherboard via

  of a dielectric receptacle, and in another mode of reacting

  The bus bar has connection pins.

  that cross holes in the motherboard.

  The invention will be better understood on reading

  the description which follows of embodiments, gives

  born by way of nonlimiting examples The continuation of the

  - description refers to the attached drawings in which:

  Ia Figure 1 is an elevational view, partial-

  torn off, from a system intended for the removable mounting of a set of daughter printed circuit boards on a

motherboard.

  Figure 2 is a perspective view, partially

  severed from the system of Figure 1, with a card

  girl shown in disconnected position from motherboard.

  Figure 3 is a perspective view, partially

  torn away, showing another bar structure om-

  nibus intended for use in the system.

  Considering Figures 1 and 2, we see a daughter board mounting system, 10, comprising daughter boards 12 mounted on a motherboard 14 and connected

  electrically to bus bars 16, 17 via

  diary of female contacts 18 coming into contact with corresponding male contact parts, 20, bars

  omnibus 16, 17 Although this is not completely

  shown in Figures 1 and 2, each daughter card 12 carries

  a set of female contacts 18 for establishing a connection

  electrical connection with bus bars 16, 17 and with other bus bars, not shown

  daughter cards 12 which are not shown also bear

  other contacts to establish a connection

  between the components mounted on different car-

  your daughters, for example through 12 spindle

  connector for coiled connections.

  The bus bars 16, 17 are made of copper and in

  their present embodiment, they include

  base sections 22 3.56 mm high and 3.81 mm wide,

  which are located under male parts 20, extending vertically

  wedging, which, in this embodiment, is 0.653 mm thick The bars 16, 17 are mounted on the motherboard 14 and are electrically insulated therefrom by

  dielectric receptacles 24 A capacitor 30 is say-

  tely connected between the bus bars 16, 17 the bus bar 17 is connected to a conductor 32 by a screw 34

  intended to be screwed into a tapped hole 36, and a connector

  nector 38 intended to receive a conductor 37 is fixed at

  the bus bar 16, and the conductor 37 is held in.

  place by a pressure screw 39 The bus bar used for mass is mounted at a level higher than that of

  other voltage distribution bus bars, fear ga-

  guarantee that when the daughter cards 12 are connected, they come into electrical contact with the Tarre omnibus

mass first.

  The female contacts 18 are the well-known tuning fork type contacts, conforming to the military standard MIL-C_ 28754, and each of them can lead to at least 5 A. They are probed with metallized parts on the daughter cards 12 and are coated in insulators 26, which have a shape

  designed to fit without play in the direct parts

  upwards of the receptacles 24, when the forks 28 are slid over the parts m Keys 20 Parts of the

  contacts 18 fixed to motherboards 12 are positioned ver-

  1 Otically online and are electrically connected

  parallel, which ensures a routing capacity

  increased rant, without using space in the direction of

the width of the cards 12.

  In operation, one can easily fix and

  electrically connect the daughter boards 12 to the motherboard 14 by lowering them to bring them into contact with

  bus bars and other connectors on the motherboard.

  Due to the fact that the ground bus bar is higher than the other bus bars, the daughter cards come into contact with the ground first, which prevents components from being damaged Because the bus bars are on the same side as the motherboard than the daughterboards and are directly connected to the daughterboards, we save space and there is good electrical conduction between the components located on the daughterboards and the bus bars the fact of placing the bus bars on the same side as daughter cards also offer space to easily attach

  capacitors between the busbars and avoids problems

  interference between the bus bars and the coiled wires

on the connector pins.

  Other embodiments fall into the box.

  dre of the invention By way of example, as shown in the

  figure 3, we can use bus bars 40 which

  carry connector pins 42 to establish con-

  electrical connection with conductive parts of the motherboard 44 In addition, in addition to copper, other rigid and conductive materials can be used for the bus bars

  electricity, like phosphor bronze and brass.

  It goes without saying that many other modifications

  can be made to the device described and shown

  felt, without departing from the scope of the invention.

Claims (7)

  1 System for the removable mounting of a set of daughter printed circuit boards (12) on a motherboard (14), characterized in that it comprises g a motherboard (14); at least one bus bar (16) mounted on a first side of the motherboard (14); this bus bar (16) consisting of an electrically conductive material and   having accessible contact parts (20); and a   appears to be daughter circuit boards (12) mounted on the motherboard (14), from the first side, being directed transversely with respect to the motherboard, each of the daughter boards comprising at least one daughter board contact (18 ) having a shape designed so that it adapts to one of the accessible contact parts (20) or 20 System according to claim 1, characterized   in that the contact parts include a ma-   the (20) which extends transversely with respect to the motherboard (14), along the length of the bus bar (16), and in that the daughter card contacts (18) are contacts   females having forks (28) which come in contact   tact with opposite sides of the mile part (20 :).   3 System according to claim 2, characterized in that a set of female contacts (18) are mounted on a daughter card (12) to establish a connection with a common bus bar (16), and these female contacts for the bus bar common are attached to the daughter board (12) along a transverse axis relative to the bar   omnibus (16) and relative to the motherboard (14).   4 System according to any one of the claims   1 to 3, characterized in that the bus bar (16) is mounted on the motherboard (14) via a dielectric receptacle (24).   System according to claim 4, characterized in that the bus bar (16) has a part (22) situated below the mile part (20) which has a width   higher than that of the male part.   6 System according to any one of the claims.   1 to 3, characterized in that the bus bar (16) has connector pins (42) which pass through the motherboard (14). 7 System according to any one of claims 1 to 6, characterized in that it comprises a second bus bar (17) and a capacitor (30) connected between the bus bars (16, 17) G   8 th System according to any one of the claims   tions 1 to 6, characterized in that it comprises two bus bars (16, 17) and one of the bus bars is higher that the other.   9 System according to any one of the claims   1 to 8, characterized in that the bus bars (16,   17) are made of copper, phosphor bronze or brass.   System according to claim 2, characterized in that the soft part (20) is 0.56 mm thick   11 System according to any one of the claims   tions 2, 3 or 10, characterized in that each daughter card connector (18) has a current conduction capacity; sufficient to drive at least 5 amp Rèe,%