| 摘要 |
PURPOSE:To make a filter visible from the position over a wide range by making the filter visible also from the oblique position. CONSTITUTION:A transparent body 5 formed by an acrylic material, etc. which is thicker than the wall of a visual window part is provided to the visual window 4 provided to the filter main body 1, and the side wall surface of the transparent body 5 is formed with a total reflection surface. Consequently, since the image of a filter 8 is reflected on the side wall surface of the transparent body 5, the filter 8 is easily visible from an oblique position and the filter 8 is also visible from positions over a wide range. Accordingly, the filter 8 is visible even in a narrow space in a kitchen, etc., and the exchange time of a cartridge 2 can be easily decided.
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