| 摘要 |
An optical liquid level sensor is provided to detect the liquid by minimizing the condensation of the liquid on the surface of the sensor by making the surface smooth and even. An optical liquid level sensor comprises a PCB(Printed Circuit Board, 110), a pair of light emitting and receiving chips(120,130), a first molding unit(150), and a second molding unit(160). An electric circuit pattern is formed on the PCB. A pair of light emitting and receiving chips is mounted in the electric circuit pattern of the PCB. The first molding unit isolates the light emitting and receiving chips. The second molding unit is formed at the light emitting and receiving chips and the first molding unit. The output light of the light emitting chip is guided from the second molding unit to the light-receiving chip. The second molding unit has a flat liquid detecting surface of the liquid. |
