Apparatus for inspecting both sides of tape or sheet

Details Apparatus for inspecting both sides of tape or sheet Apparatus for inspecting both sides of tape or sheet

1989-10-17

1991-10-29

Rosenberger, Richard A.

Optics: measuring and testing

By configuration comparison

With two images of single article compared

359372, 359376, G02B 2702

Patent

active

050610740

ABSTRACT:
An apparatus for inspecting the top and bottom surfaces of a tape or sheet has a device to magnify the surface of the tape or sheet, with its objective lens disposed to face the top surface of the tape or sheet. The apparatus also has an optical transmittion system that transmits an image of the bottom surface of the tape or sheet through a focusing unit and four reflectors, each of which is adapted to bend the path of light rays 90 degrees. Of the four reflectors, one that faces the objective lens is retractable from the light-ray path in the optical transmission system. The reflector facing the objective lens may be a half-coated mirror. Fixed in the light-ray path in the optical transmission system, the half-coated mirror is not retractable.

REFERENCES:
patent: 3421806 (1969-01-01), Weber
patent: 3752589 (1973-08-01), Kobayashi
patent: 3900244 (1975-08-01), Wiesler et al.
patent: 4619503 (1986-10-01), Reinheimer et al.
patent: 4827376 (1989-05-01), Voss
Jackson et al., "Dual Microscope System", IBM Technical Disclosure Bulletin, vol. 21, No. 8 (Jan. 1979), pp. 3129-3130.

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