摘要:
A motion sensor which can easily and accurately detect bearing, attitude and acceleration in any of three-dimensional directions and a portable telephone using the same. The motion sensor comprises three magnetic sensing parts for detecting.magnetic field strength in 3-axis directions orthogonal to one another, and three acceleration sensing parts for detecting accelerations in the 3-axis directions. Each of the acceleration sensing parts has a magnet body constituted to be able to displace depending on acceleration, and a magnet displacement detection head for detecting a displacement of the magnet body. The three magnetic sensing parts and the three magnet displacement detection heads are all made of the same type of magnetic detection elements which operate based on common operation principles. The three magnetic sensing parts and the three acceleration sensing parts are integrated into one modular package together with one electronic circuit for controlling these six magnetic detection elements.
摘要:
A spring member (21) used in an acceleration sensor, for supporting weight members (22a-22d) that cooperate as magnetic field generation members or magnetic field detection sensors includes at least one strip-shaped plate spring (21b,21c) with a fulcrum and support sections (21d-21g) separated from the fulcrum for supporting the weight members (22a-22d). The at least one strip-shaped plate spring (21b,21c) is configured to produce a bending stress in response to an external force applied so as to displace the weight members (22a-22d).
摘要:
A sensor device (120) consisting of a temperature sensor deposited onto a spin valve device (10) comprising a plurality of layers arranged as a stack with a layer with low Curie temperature (122) at least 2 spacer layers (121,123) and a permanent magnetic layer (124). The low Curie temperature layer (122) loses its magnetisation when temperature drops below the Curie temperature which leads to an increase of electric resistance in the spin valve device (10).
摘要:
An accelerometer for measuring the displacement of a magnet body using magnetic detecting elements is provided, the accelerometer having superior measurement accuracy by suppressing influence of an external magnetic field such as the earth magnetic field. The accelerometer has detecting units each having a cantilever which is elastically deformed so as to rotate around a fixed end thereof, a magnet body provided at a free end of the cantilever, and a magnetic detecting head portion disposed outside the rotation region of the cantilever. In order to correct detection signals output from the magnetic detecting head portions, the accelerometer has peripheral magnetic field detecting portions for measuring an external magnetic field acting on the magnetic detecting head portions and the magnet body for correcting a detection signal output from the magnetic detecting head portion. The correction includes a correction of the cantilever movement in response to the external magnetic field. The beam may be formed of a Ni-P alloy, and its support may extend parallel to the beam, to protect the beam.
摘要:
A method of calibrating an acceleration sensor includes suspending an inertial body using a magnetic fluid; generating a magnetic field within the magnetic fluid; modulating the magnetic field to cause a displacement of the inertial body; measuring a response of the inertial body to the modulation; and calibrating the acceleration sensor in real time based on the measurement. Current can be driven through a plurality of magnets for generating the magnetic field so as to create the modulation. Sensing coils can be used for detecting the response of the inertial body. The modulation can be periodic, an impulse or some other aperiodic function.
摘要:
A sensor device comprises a beam anchored at both ends to a mounting frame (31, 37) and composed of an amorphous material exhibiting a magnetostrictive effect. The beam has disposed at an intermediate point along its length a seismic mass (29), which may be magnetic or non-magnetic, and a magnetising coil (34) for imposing an alternating carrier flux upon the beam and a sensing coil (35) for sensing changes in magnetic field associated with the beam due to accelerations of an object to which the mounting frame is attached. The sensing coil may be in two sections (35a, 35b), one each side of the seismic mass, for the suppression of a transverse sensing effect. The invention also provides for the realisation of a strain-sensing device, the seismic mass being then dispensed with.
摘要:
In the acceleration sensor (11) proposed, the measurement unit (16), comprising a flexural spring (17) and two permanent magnets (20, 21), is fitted in a recess (15) in a stop plate (13). The stop plate (13) is attached to the connector housing (12). Located on the upper surface of the stop plate (13) is a hybrid circuit (25), while the baseplate (36) for the housing (10) rests against the lower surface of the stop plate (13). The permanent magnets (20, 21) act both as seismic masses and also, in conjunction with the baseplate (36), as damping elements. The acceleration sensor (11) is particularly compact and simple in design and meets the requirements for a failsafe sensor.
摘要:
An electrode layer (E1) is formed on the upper surface of a first substrate (100), and a processing for partially removing the substrate is carried out in order to allow the substrate to have flexibility. To the lower surface of the first substrate, a second substrate (200) is connected. Then, by cutting the second substrate, a working body (210) and a pedestal (220) are formed. On the other hand, a groove (401) is formed on a third substrate (400). An electrode layer (E2) is formed on the bottom surface of the groove. The third substrate is connected to the first substrate so that both the electrodes (E1, E2) face to each other with a predetermined spacing therebetween. Finally, the first, second and third substrates are cut off every respective unit regions to form independent sensors, respectively. When an acceleration is exerted on the working body (210), the first substrate (100) bends. As a result, the distance between both the electrodes (E1, E2) changes. Thus, an acceleration exerted is detected by changes in an electrostatic capacitance between both the electrodes.