Optical filter, method of making optical filter, light...

Details Optical filter, method of making optical filter, light... Optical filter, method of making optical filter, light...

2006-03-21

2006-03-21

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000, C359S889000, C348S362000

Reexamination Certificate

active

07016129

ABSTRACT:
An optical filter which can be manufactured at low cost and is excellent in optical characteristics is disclosed. The optical filter has a transparent substrate and a first layer which is formed on the surface of the transparent substrate. Here, the first layer has a first area which is substantially transparent and a second area which has colored ink and is light-amount adjustable, and the optical path lengths with respect to the first and the second areas are substantially equal.

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