| 摘要 |
The present invention has an object to provide a manufacturing method of readily realizing an optical filter having a flat transmission characteristic and a superior cutoff characteristic relative to adjacent bands. To this end, with the manufacturing method of the present invention, a bandpass filter consisting of a dielectric multilayer coating is formed on one plane of a transparent substrate, and an antireflection coating is formed on the other plane of the substrate. The substrate is then divided into a plurality of segments, and adjacent two segments are selected and adhered to each other by a transparent adhesive with band-pass filter surfaces of these segments facing to each other, while interposing a glass spacer between the band-pass filter surfaces, to thereby obtain an optical filter.
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