Inspection method and inspection apparatus for inspecting electrical characteristics of inspection object
An inspection method including measuring a height of a load cell of a load detecting mechanism using a laser length measuring mechanism, obtaining a first rise amount of the load detecting mechanism from a measuring position of the load detecting mechanism up to a contact starting position, measuring a height of an electrode of a wafer using the laser length measuring mechanism, and obtaining a second rise amount of a main chuck up to the contact starting point of the electrode with the probe based on a difference between a measuring height of the electrode of the wafer and the measuring height of the load detecting mechanism.
1. An inspection method for inspecting electrical characteristics of an inspection object by bringing each contact into contact with each of a plurality of electrodes of the inspection object placed on a table, the inspection method comprising:
(a) measuring a height of a reference point provided on the table by a length measuring mechanism;
(b) measuring a first rise amount taken for raising the reference point from a position of the table when the height of the reference point is measured up to a contact starting point in which the reference point comes into contact with a tip of the contact;
(c) measuring a height of the electrode of the inspection object by the length measuring mechanism;
(d) obtaining a second rise amount necessary for raising the electrode of the inspection object up to the contact starting point based on the height of the reference point obtained in (a) , the first rise amount up to the contact starting point obtained in (b) and the height of the electrode obtained in (c);
(e) bringing the electrode of the inspection object placed on the table into contact with the probe by raising the table only by the second rise amount obtained in (d); and
(f) inspecting the electrical characteristics of the inspection object with the electrode and the tip of the contact in contact with each other electrically.
2. An inspection method for inspecting electrical characteristics of an inspection object by bringing each contact into contact with a plurality of electrodes of the inspection object placed on a table, the inspection method comprising:
(a) measuring a height of a load detecting mechanism provided on the table by a length measuring mechanism;
(b) measuring a first rise amount taken for raising the load detecting mechanism from a position of the load detecting mechanism when the height of the load detecting mechanism is measured up to a contact starting point in which the load detecting mechanism comes into contact with a tip of the contact;
(c) measuring a height of the electrode by means of the length measuring mechanism; and
(d) obtaining a second rise amount necessary for raising the electrode up to the contact starting point based on the height of the load detecting mechanism measured in (a), the first rise a mount measured in (b) and the height of the electrode measured in (c).
3. The inspection method according to claim 2 further comprising:
(e) bringing the electrode of the inspection object placed on the table into contact with the tip of the contact by raising the table only by the second rise amount obtained in (d); and
(f) inspecting the electrical characteristics of the inspection object with the electrode and the tip of the contact kept in electrical contact with each other.
4. The inspection method according to claim 2 further comprising:
(b1) measuring the height of the contact starting point corresponding to a plurality of electrodes of the inspection object by repeating the (b2) and measuring the degree of parallelization between the table and the inspection object based on each height.
5. The inspection method according to claim 2 further comprising:
(c1) measuring the height of a plurality of electrode surfaces of the inspection object by repeating the (c); and
(c2) obtaining an inclination of a plane formed by the plurality of the electrodes based on the measured heights of the plurality of the electrodes.
6. The inspection method according to claim 2 further comprising:
(d1) obtaining the second rise amount of each of the plurality of the electrodes of the inspection object by repeating the (d); and
(d2) obtaining the degree of parallelization between the table and a plane formed by the tip of the contacts based on the second rise amount of each of the plurality of the electrodes.
7. The inspection method according to claim 2 , wherein the length measuring mechanism is an optical system length measuring mechanism.
8. The inspection method according to claim 2 , wherein the length measuring mechanism is an alignment mechanism to align the electrode of the inspection object with the contact of the contact holding mechanism.
9. The inspection method according to claim 2 , wherein the length measuring mechanism has a capacitance sensor.
10. The inspection method according to claim 2 , wherein the load detecting mechanism has a load cell.