MANUFACTURING METHOD OF AN APERTURE DEVICE
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United States of America Patent
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app pub date -
Mar 26, 2012
filing date -
Oct 21, 2008
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Abandoned
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Abstract
A method of manufacturing an aperture device for forming a filter into a predetermined shape by die cutting, comprises a sheet setting step of positioning and setting a filter sheet material in a die-cutting forming die, a density boundary line identifying step of optically reading a density pattern of the light-reducing film and identifying a boundary line of changes, a die-cutting position correcting step of making a relative position adjustment to the sheet material and a die-cutting position of the die-cutting forming die, a filter forming step of forming the filter sheet material into a predetermined shape by die cutting, and a bonding step of bonding the filter to the base plate. In the filter forming step, an alignment reference face is formed concurrently with forming the filter sheet material into a predetermined shape by die cutting, and formed in a predetermined positional relationship with the density boundary line.
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