Optical method for determining relative positions of two pieces

Details Optical method for determining relative positions of two pieces Optical method for determining relative positions of two pieces

1993-02-26

1994-08-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356387, G01N 2186

Patent

active

053430492

ABSTRACT:
Optical method for determining the lateral gap of two pieces (1, 2) having adjacent edges (3, 4) forming a slot (5) consisting in emitting a parallel light beam (8) through at least one zone of said slot, from one side of the latter; in detecting the beam (8a) passing through this zone of said slot, at the other side of the latter; and in comparing the light intensity of this beam transversing said zone with a predetermined value so as to obtain or to provide the gap between the edges of said pieces in said zone. This method may be applied to the positioning of a first piece, such as a chip, opposite or in an opening made in a second piece, such as a substrate, and may consist in moving said first piece in order to bring it above the opening of the second piece, in comparing, as the first piece moves, the light intensity passing through the slot separating said pieces and in stopping the movement of the first piece when the intensity of the light through-beam is equal to a predetermined value.

REFERENCES:
patent: 3193689 (1965-07-01), Kerr
patent: 3765774 (1973-10-01), Petrohilos
patent: 4182259 (1980-01-01), Garner et al.
patent: 4297585 (1981-10-01), Puschmann
patent: 4821544 (1989-04-01), Tamler et al.
patent: 5239183 (1993-08-01), Kound et al.
Hogenkamp et al., "Optoelectronic Sensor for Measuring the Shape of Two-Dimensional Objects," Sensors and Actuators, 17:259-266, 1989.

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