Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1989-01-23
1992-04-14
Picard, Leo P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
361413, 211 41, 439565, H05K 714
Patent
active
051053390
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an arrangement for retaining a printed circuit board (PCB) at a frame, said arrangement including connectors with electrical connection pins connected to electrical conductors in the PCB, the connectors being elongate and having end portions, the backs of which bear against the front of the PCB.
BACKGROUND ART
Electronic equipment, e.g. for computers or telephone exchanges, is in many applications supported mechanically by a rack which is divided into compartments. The back of each compartment has a PCB, to which a plurality of other so-called daughter PCBs in each compartment are connected. Compartments of this type are to be found described in a brochure from Teradyne Connection Systems, Inc, Nashua, NH, USA under the name of STRONGHOLD .TM. Card Guidance System. The brochure was printed in 1982 and revised in 1984 with the revision number REV.A 4-84. The implementation can be likened to a book shelf where the PCBs at the back of the compartments correspond to the back of the book case and the daughter PCBs correspond to the books. Each compartment has a frame retaining the PCB at the back of the compartment, and the daughter PCBs are thrust into grooved holders at the sides of the compartment. At their rear edges the daughter PCBs have electrical connection means, and the PCB at the back of the compartment has connectors with corresponding connection means, so that a daughter PCB can be connected to a connector when it is thrust into the compartment in its holders. The connectors have connection pins which are connected to electrical conductors in the PCB at the back of the compartment. The connectors are fastened to the PCB and, as mentioned, the latter is in turn fastened to the frame. The above described arrangement has the disadvantage that the PCBs at the back of the compartment must be very stable to withstand the forces occurring when a daughter PCB is thrust into its connector. The PCBs are therefore made thick, which increases expense in their manufacture. The different layers of electrical conductors in the PCB will be at a relatively large mutual spacing, resulting in that the capacitance between the layers will be small and the PCBs have poor impedance adaptability and poor cross talk properties when tightly packed.
DISCLOSURE OF INVENTION
The above-mentioned disadvantages are avoided by an arrangement in accordance with the invention in which the PCBs at the backs of the compartments are only subjected to small forces when the connectors on the PCBs are connected.
The arrangement has the characterizing features disclosed in the accompanying claims.
BRIEF DESCRIPTION OF DRAWINGS
One embodiment of the invention will now be described in more detail below and in connection with the drawing, where
FIG. 1 is a perspective view of a PCB with connectors,
FIG. 2 is a cross section of a PCB with a connector retained in a frame by an inventive arrangement,
FIG. 3 is a perspective view of a part of the retaining means,
FIG. 4 is a cross section of an alternative embodiment of the retaining means,
FIG. 5 is a cross section of a further embodiment of a retaining means and
FIG. 6 is a perspective view of the retaining means in FIG. 5.
BEST MODE FOR CARRYING OUT THE INVENTION
A known PCB 1 is illustrated in FIG. 1 and is provided with connectors 2 in which electrical connection pins 3 are fixed. The connectors 2 have end portions 4, the backs of which bear against the front of the PCB, and the connection pins 3 are thrust (in a way not illustrated in the Figure) into holes in the PCB 1 and connected to its electrical conductors. The PCB 1 is, as is described above, intended to be fastened to the back of a compartment, which has means for retaining daughter PCBs, which are connected to the PCB 1 via the connection pins 3 in the connectors 2.
In FIG. 2 there is illustrated an inventive arrangement for retaining the PCB 1 in a frame 5, which is placed at the back of a compartment in an unillustrated manner. According to this embodiment the frame 5 includes
REFERENCES:
patent: 3533045 (1968-05-01), Henschen
patent: 3652899 (1972-03-01), Henschen
patent: 3798507 (1974-03-01), Damon et al.
patent: 4134632 (1979-01-01), Lindberg et al.
patent: 4486816 (1984-12-01), Hope
patent: 4595249 (1986-06-01), Oehlert et al.
Ernolf Stig C.
Kassman Bjorn T.
Olsson Karl-Gustaf
Olsson Rolf T.
Ghosh Paramita
Picard Leo P.
Telefonaktiebolaget LM Ericsson
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