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Device for recognizing the position of the terminals of components
| Details |
Inventors: Grasmuller, Hans Horst; Wittmann, Gunther;
Assignee: Siemens Aktiengesellschaft (Munich, DE)
Primary Examiner: Sember; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: Hill & Simpson
The device for recognizing the position of the terminals (A) of components (BE) whose optical unwanted structures proceed in two principal directions (X, Y) has an image transducer (BW) equipped with an objective (O); and at least one segmented ring light illumination (RB; RB1, RB2) whose rays (S; S1, S2) are incident onto the surface of the components (BE) from all sides upon exclusion of angular segments (WS) around the principal directions (X, Y). By suppressing the light directions incident perpendicular and parallel to the unwanted structures, the terminals (A) are presented with clearly higher contrast than the other structures of the components (BE). The device is particularly utilized in components vision systems of automatic equipping units. It enables a reliably recognition of the position of the spherical terminals even given flip chips, bare chips and ball grid arrays and, thus, an exact optoelectronic centering of these components. |
|
DETAILED DESCRIPTION The invention is based on the problem of creating a device for recognizing the position of the terminals of components wherein the terminals to be recognized are optically isolated and disturbing structure details are optically suppressed for simplification of the image evaluation.
The invention is based on the perception that, given flip chips, bare chips, ball grid arrays and comparable components with spherical terminals, the optical unwanted structures proceed in two principal directions, whereby these principal directions usually coincide with the directions of the component edges.
When, during the illumination, the light directions incident parallel and perpendicular to the unwanted structures are suppressed, then the terminals to be recognized in terms of their position are presented with clearly greater contrast than the unwanted structures.
Advantageous developments of the invention are as follows.
The development limits the precluded angle segments of the ring light illumination to .
+-.
15.
degree.
, so that the unwanted structures are imaged clearly more weakly than the useful structures even given greater delivery tolerances of the components.
Optimum conditions in view of an optimally intense illumination of the useful structures derive according to claim 3 when the precluded angle segments amount to approximately .
+-.
10.
degree.
.
Given components with highly pronounced unwanted structures, a segmented ring light illumination is especially suitable, the rays thereof being incident onto the surface of the components from all sides at an illumination angle of 45.
degree.
to 90.
degree.
relative to the optical axis of the objective.
Illumination angles of 55.
degree.
to 65.
degree.
are even better for the imaging of the spherical terminals of components with highly pronounced unwanted structures, whereas optimum conditions for the imaging and positional recognition of the terminals derive given an illumination angle of approximately 60.
degree.
.
The development enables a simple and economic realization of a ring light illumination at a flat angle
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Light Fixtures 
