| 摘要 |
PROBLEM TO BE SOLVED: To solve problems such as an increase in size of a circuit substrate, component cost, and man-hours required for adjustment when components and adjustment man-hours for them such as a resistor and a variable resistor are required specially for adjusting output and correcting an offset of an imaging lens position detecting Hall element. SOLUTION: The lens position detector includes a Hall element detecting a magnetic field, a current supply circuit supplying electric current to the Hall element, a first differential amplifier controlling a supply voltage of the Hall element so that one output of the Hall element is equalized to a reference voltage, a voltage amplification circuit amplifying the output of the Hall element, and a voltage correction circuit giving an offset to the input voltage of the voltage amplification circuit. COPYRIGHT: (C)2009,JPO&INPIT |
