Electric resistance measuring apparatus and method for circuit board

An electric resistance measuring apparatus for circuit boards, which comprises a one-side inspection circuit board arranged on one side of a circuit board to be inspected, and having a plurality of connecting electrodes, which are arranged correspondingly to each of a plurality of electrodes to be inspected on said one side of the circuit board to be inspected, at its surface, and a connector member provided on the surface of the one-side inspection circuit board, wherein:

• the connector member is composed of an insulating base in the form of a sheet or plate, a plurality of front-side terminals arranged correspondingly to the electrodes to be inspected on said one side of the circuit board to be inspected on the front surface of the insulating base, back-side terminals arranged on the back surface of the insulating base respectively contacting with the connecting electrodes on the one-side inspection circuit board and electrically connected respectively to the front-side terminals, and a short-circuit member for electrically connecting the adjacent front-side terminals to each other, which is provided on the front surface of the insulating base,
• the front-side terminals of the connector member are respectively brought into contact with the electrodes to be inspected on said one side of the circuit board to be inspected, thereby electrically connecting each of the electrodes to be inspected to a plurality of the connecting electrodes through the connector member to form a measurable state, and
• in this measurable state, two electrodes of a plurality of the connecting electrodes electrically connected to a specified electrode to be inspected on said one side of the circuit board to be inspected are selected to use one of them as an electrode for current supply and the other as an electrode for voltage measurement, thereby performing measurement of electric resistance related to the specified electrode.

An electric resistance measuring method for circuit boards, which include a one-side inspection circuit board arranged on one side of a circuit board to be inspected, at which electrodes to be inspected are located, and having a plurality of connecting electrodes at its surface, and layer connector members provided on the surface of the one-side inspection circuit board and formed of a conductive elastomer, comprising steps of;

• bringing each of the layer connector members into simultaneous contact with all connecting electrodes belonging to one group of a plurality of connecting electrodes, which are adjacent to each other, among the connecting electrodes at one side thereof to be electrically connected thereto, and at the other side thereof, brought into simultaneous contact with all electrodes to be inspected belonging to one group of a plurality of electrodes to be inspected, which are adjacent to each other, among the electrodes to be inspected on said one side of the circuit board to be inspected to be electrically connected thereto, thereby forming a measurable state, and
• using, in this measurable state, one of two electrodes of the connecting electrodes belonging to the group of the connecting electrodes as an electrode for current supply, and using the other as an electrode for voltage measurement, thereby performing measurement of electric resistance related to a specified electrode specified from among the electrodes belonging to the group of the electrodes to be inspected.

An electric resistance measuring method for circuit boards, which include a one-side inspection circuit board arranged on one side of a circuit board to be inspected, and having a plurality of connecting electrodes, which are arranged correspondingly to each of a plurality of electrodes to be inspected on said one side of the circuit board to be inspected, at its surface, and a connector member provided on the surface of the one-side inspection circuit board, wherein:

• the connector member is composed of an insulating base in the form of a sheet or plate, a plurality of front-side terminals arranged correspondingly to the electrodes to be inspected on said one side of the circuit board to be inspected on the front surface of the insulating base, back-side terminals arranged on the back surface of the insulating base respectively contacting with the connecting electrodes on the one-side inspection circuit board and electrically connected respectively to the front-side terminals, and a short-circuit member for electrically connecting the adjacent front-side terminals to each other, which is provided on the front surface of the insulating base, the method comprising steps of;
• bringing the front-side terminals of the connector member respectively into contact with the electrodes to be inspected on said one side of the circuit board to be inspected, thereby electrically connecting each of the electrodes to be inspected to a plurality of the connecting electrodes through the connector member to form a measurable state, and
• selecting to use, in this measurable state, two electrodes of a plurality of the connecting electrodes electrically connected to a specified electrode to be inspected, on said one side of the circuit board to be inspected, one of them as an electrode for current supply and the other as an electrode for voltage measurement, thereby performing measurement of electric resistance related to the specified electrode.