Calibration methods, calibration substrates, lithographic...

Radiation imagery chemistry: process – composition – or product th – Registration or layout process other than color proofing

Reexamination Certificate

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C430S030000, C355S053000, C355S077000, C356S399000, C356S400000, C356S401000, C438S401000

Reexamination Certificate

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06936385

ABSTRACT:
To calibrate a front-to-backside alignment system a transparent calibration substrate with reference markers on opposite sides is used. A plane plate is inserted to displace the focal position of the alignment system from the top to bottom surface of the calibration substrate.

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X-Ray Lithography Mask With Visible Light Transmitting Areas, IBM Technical Disclosure Bulletin, Oct. 1989, Vo. 32, No. 5A. pp. 240-241.

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