Patent ID: 8443669
Filing Date: 2013-05-21
Classification: G01P

Abstract:
1. A servo accelerometer having a pair of housings having a tubular part, made of a magnetic material, and having one end opened and the other end closed with a closing part, in which a frame that supports a pendulum inside thereof via hinges is held between said one ends of said pair of housings, a permanent magnet is attached to an inner surface of each of the closing parts of said pair of housings with a bottom pole piece made of a magnetic material interposed therebetween, an annular magnetic gap is formed between each permanent magnet and the inner circumference of said one end of the corresponding one of said pair of housings, and a pair of coils arranged in the annular magnetic gaps to be coaxial with each other is attached to the opposite surfaces of said pendulum, wherein each of said closing parts has a recess formed in the inner surface thereof, and said bottom pole piece is disposed in the recess, and the outer circumference of said bottom pole piece faces the inner circumference of said recess with a predetermined gap interposed therebetween.