Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1998-06-18
2000-09-26
Metjahic, Safet
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324755, 324758, G01R 3102
Patent
active
061247227
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention has for object a machine for the electrical test of printed circuits with adjustable position of the sound needles.
BACKGROUND ART
In prior art machines for the checking of printed circuits are known.
These machines generally are endowed of a board or bed that bears a plurality of electrically conductive needles, on which is placed the printed circuit card and by suitably activating the electric conductivity among the different needles and by taking the respective measurings it is possible to check whether or not the printed circuit has some defects.
Obviously for such check it is necessary for the needles to contact the printed circuit in the suitable position. As the printed circuits are very different, it is necessary to apply over the base needle board, an adaptation board that comprises the same needles but displaced in a different way according to the printed circuit to be checked.
The drawback of this solution is in the limits of the machine and in the possibility of checking only the printed circuits for which are available corresponding adapters or adapting boards.
Requiring as many adapting boards as are the cards with different printed circuits to be checked.
Furthermore it is known that the surfaces of the circuits are not always coplanar, wherefore it is not always ensured a suitable and to the bottom-side bed-of-nails test probe array for locking down said DUT during a test and for generating said pushrod force for driving the bommo-side bed-of-nails test probe array into electrical contact with said plurality of test points on said second side of said DUT.
DISCLOSURE OF INVENTION
The purpose of the present invention is that of obviating the above-mentioned drawbacks, and in particular of allowing the making of a machine able to check the different printed circuits, that is by means of a detection conductive needles system that can be adapted to any circuit type.
This and other purposes are reached as claimed by means of a machine for the electrical test of printed circuits, of the type comprising a board which bears a plurality of conductive needles that are connectable on their reverse side to means for the analysis of the electrical parameters of one and the other needle, characterised in that: least two boards or vice-versa.
In this way there is the immediate advantage of simplifying the whole system by making universal the application of the machine to different printed circuits without need for adapters.
In fact by this it is possible to activate one board needle in electric conduction for an effective contact.
Another solution provides to make movable that is adjustable the respective needles one independently from the other, but this solution is extremely complex and expensive.
The latter solution requires also long checking times because a great number of movable needles cannot be available, wherefore there must practically be a check of each circuit.
Similar features can be observed in U.S. Pat. No. 5,436,567 (WERXLER ET AL.) Jul. 25, 1995 (claim 1 FIG. 1) that discloses a two-sided test probe mechanism, comprising: electrical connection with a first side of a device-under-test (DUT); plurality of testpoints on a second side of said DUT opposite to said first side; array of spring-loaded contacts and fixed to the bottom-side bed-of-nails test probe array for clamping said DUT with; the array of spring-loaded electrical probes and having means for receiving a pushrod force of a first direction perpendicular to a plane including the array of spring-loaded electrical probes and for translating said pushrod force to drive said array of spring-loaded electrical probes independently articulated within the compressing means in a second direction opposite to said first direction and into perpendicular electrical contact with a plurality of test points on said first side of said DUT; any position of the circuit leading end and to activate an opposed needle of the opposed board, which thanks to the mobility, even of said opposed board can reach any determ
REFERENCES:
patent: 4092593 (1978-05-01), Wolk
patent: 4841241 (1989-06-01), Hiltz et al.
patent: 4975637 (1990-12-01), Frankeny et al.
patent: 5068600 (1991-11-01), Hiltz et al.
Fumo Cesare
Vodopivec Jozef
Deb Anjan K
Metjahic Safet
New System S.R.L.
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