Apparatus for inspecting both sides of tape or sheet
Patent 5061074 Issued on October 29, 1991. Estimated Expiration Date: 
October 17, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 17, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3421806 3752589 3900244 Transmitted light and/or incident light inverse microscope Heat dissipating interconnect tape for use in tape automated bonding Patent #: 4827376 InventorsAssigneeApplicationNo. 422491 filed on 10/17/1989US Classes:356/390, With two images of single article compared359/372, With plural optical axes359/376StereoscopicExaminersPrimary: Rosenberger, Richard A.Attorney, Agent or FirmForeign Patent References
International ClassG02B 027/02Foreign Application Priority Data1988-10-17 JPAbstractAn 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.Other References
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