ROTATION SENSOR

• Main Author: OMI TETSUYA
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2017
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

PROBLEM TO BE SOLVED: To provide a rotation sensor for preventing deterioration in detection accuracy while suppressing influence of noise in a pulse signal.SOLUTION: A rotation sensor includes a detection element and a pulse output section. The pulse output section outputs a first pulse signal P1. The pulse output section has a first comparison section, a second comparison section, and a pulse generation section. The first comparison section compares a first threshold Th1 and a second threshold Th2 greater than the first threshold Th1 with a detection signal A and generates a second pulse signal P2. The second comparison section compares the first threshold Th1 and a third threshold Th3 smaller than the first threshold Th1 with the detection signal A and generates a third pulse signal P3. The first pulse signal P1 rises at one of a phase when the detection signal A in the second pulse signal P2 reaches the second threshold Th2 due to increase and a phase when the detection signal A in the third pulse signal P3 reaches the first threshold Th1 due to decrease, and falls at the other.SELECTED DRAWING: Figure 3 【課題】パルス信号におけるノイズの影響を抑制しつつ、検出精度が低下するのを抑制する回転センサを提供する。【解決手段】回転センサは、検出素子及びパルス出力部を備えている。パルス出力部は、第１パルス信号Ｐ１を出力する。パルス出力部は、第１比較部、第２比較部、パルス生成部を有している。第１比較部は、第１閾値Ｔｈ１、及び、第１閾値Ｔｈ１よりも大きい第２閾値Ｔｈ２と、検出信号Ａと、を比較し、第２パルス信号Ｐ２を生成する。第２比較部は、第１閾値Ｔｈ１、及び、第１閾値Ｔｈ１よりも小さい第３閾値Ｔｈ３と、検出信号Ａと、を比較し、第３パルス信号Ｐ３を生成する。第１パルス信号Ｐ１は、第２パルス信号Ｐ２における検出信号Ａが上昇により第２閾値Ｔｈ２に到達したときの位相、及び、第３パルス信号Ｐ３における検出信号Ａが下降により第１閾値Ｔｈ１に到達したときの位相の一方で立ち上がり、他方で立ち下がる。【選択図】図３