Precision placement apparatus having liquid crystal shuttered du

Details Precision placement apparatus having liquid crystal shuttered du Precision placement apparatus having liquid crystal shuttered du

1994-04-04

1996-05-21

Epps, Georgia Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359638, 356399, 356401, G02B 2714, G01B 1100

Patent

active

055195350

ABSTRACT:
A precision placement apparatus comprises an improved probe for aligning a component and a substrate based upon features on the inner surfaces arranged in facing, spaced relationship, prior to assembling the component to the substrate. The probe comprises a dual prism assembly having a first face for viewing the componenet surface and a second face for viewing the substrate surface. The dual prism assembly superposes the images of the surfaces to permit an operator to accurately align the elements. A liquid crystal shutter is mounted onto one face of the dual prism assembly to exclude the image of the corresponding surface and thereby allow the operator to quickly determine the features of the other surface in order to make the appropriate adjustments.

REFERENCES:
patent: 3684384 (1972-08-01), Hojo
patent: 3751170 (1973-08-01), Hidaka
patent: 4636080 (1987-01-01), Feldman
patent: 4652134 (1987-03-01), Pasch
patent: 4685807 (1987-08-01), Picard
patent: 5137363 (1992-08-01), Kosugi
patent: 5187372 (1993-02-01), Clube
patent: 5280332 (1994-01-01), Torcher
patent: 5311304 (1994-05-01), Monno
patent: 5457538 (1995-10-01), Ujiie
J. V. Culver, "Two Color Optical Alignment-System", Mar. 1975, p. 2983, vol. 17, No. 10, IBM Technical Disclosure Bulletin.
C. A. Gaston, "Alignment Beamsplitter Cube", Oct. 1982, pp. 2301-2303 vol. 25, No. 5, IBM Technical Disclosure Bulletin.

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