| 摘要 |
PROBLEM TO BE SOLVED: To provide a toilet bowl cleaning device causing no malfunction by noises from a fluorescent lamp, and eliminating wastefulness of wash water. SOLUTION: This toilet bowl cleaning device has a water supply valve 11 for supplying the wash water fed from a water supply pipe 12 in a urinal 10, a transmitting means 5 for transmitting a radio wave 7 from a transmitting antenna 5a, a receiving means 6 for receiving a reflected wave 8 of the radio wave 7 via a receiving antenna 6a, and a Doppler sensor 34 composed of a difference detecting means 4 for generating an output signal according to a difference between a frequency of the radio wave 7 and a frequency of the received reflected wave 8. A band-pass filter 3, a delay circuit 38, an adaptive filter, a urine flow determining part 1, and a water supply valve control part 39 are arranged in a rear stage of the Doppler sensor 34. The adaptive filter 2 is composed of a digital filter 40, a signal adding circuit 41, and a filter factor updating circuit 42. COPYRIGHT: (C)2005,JPO&NCIPI |
