Liquid level indicator

Abstract

Abstract PURPOSE:To obtain a liquid level indicator which can measure a consecutive change of a liquid level without causing any secular change, by providing a panel having a binary coded transmissive region between the light emitting elements and photodetector which are set in plural pairs in parallel to each other. CONSTITUTION:Light emitting elements A-E plus photodetectors A'-E' are provided at the places having opposing U-shaped slits within a case X. Then a panel Y formed by a light masking plate Zo containing light transmissive regions Za, Zb, Zc, Zd and Ze is provided between those light emitting elements and photodetectors. A float that moves up and down by the up-down movement of the liquid is attached to the panel Y. Furthermore, the distribution of the regions Za-Ze is formed in 2<5>=32 different ways according to the position. Accordingly the light receiving combination of the detector A'-E' varies according to the up-down change of the liquid. Thus this change of combination is detected to know the level of liquid.

Inventors

• 👤 Yukihisa Oda
• 👤 Takeo Hara
• 👤 Hiroaki Fukuda
• 👤 Shigeharu Kita

Bibliographic Details