LIGHT GUIDE, AND AIR FILTER AS WELL AS FAN FILTER UNIT USING THE LIGHT GUIDE

摘要

PROBLEM TO BE SOLVED: To provide a light guide capable of easily visualizing an upstream state of an air filter from a downstream side without moving to the upstream side.

SOLUTION: The air filter 1 is provided with a filter material 2 formed in a bent waveform and a frame body 3 tightly jointing and fixing the filter material 2 to an inner periphery wall face of the frame body 3 and retaining it in a given shape. A light guide 4 of a transparent material of a comb shape tightly jointing and fixing from the surface of the filter material 2 is provided so as to joint with the waveform of the bent air filter 1. The light guide 4 is formed of comb parts forming a comb shape and a base part coupling the comb parts. Hill parts to be hills of the comb have the same inclination as the filter material 2 formed bent in waveforms, and are to be tightly jointed and fixed to the filter material 2.

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