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US 7,352,172 B2Granted
Relative position detecting apparatus using magneto-resistors
AssigneeNokia Corporation
InventorMikko Ollila
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AssigneeNokia Corporation
InventorMikko Ollila
Estimating the term…
The device according to the present invention comprises at least one magnetic field generating element, at least one magneto-resistor and at least one resistance-to-current converter generating a current signal dependent on the resistance value of said at least one magneto-resistor. According to the preferred embodiment of the invention four magneto-resistors are used. A plurality of signals dependent on the ratios of the resistance values of said magneto-resistors are generated, the signals being in different phases. The mutual equality of a predetermined pair of the signals and/or the linear combinations thereof is realized only at predetermined relative positions. The relative position of the movable object is determined by counting the number of such predetermined relative positions passed during the movement of the movable object.
A position detecting apparatus in connection with an optical imaging system comprising at least one magneto-resistor and at least one magnetic field generating element, a respective resistance value of said at least one magneto-resistor being dependent on a magnetic field generated by the at least one magnetic field generating element, wherein said position detecting apparatus further comprises at least one resistance-to-current converting means to generate a current signal dependent on the resistance value of said at least one magneto-resistor.
A mobile device comprising an optical imaging system and in connection with said optical imaging system a position detecting apparatus arranged to detect a position of a least one optical component of said imaging system, said position detecting apparatus comprising at least one magneto-resistor and at least one magnetic field generating element, a respective resistance value of said at least one magneto-resistor being dependent on a magnetic field generated by the at least one magnetic field generating element, wherein said position detecting apparatus further comprises at least one resistance-to-current converting means to generate a current signal dependent on the resistance value of said at least one magneto-resistor.
A mobile communication device comprising an optical imaging system and in connection with said optical imaging system a position detecting apparatus arranged to detect a position of a least one optical component of said imaging system, said position detecting apparatus comprising at least one magneto-resistor and at least one magnetic field generating element, the respective resistance value of said at least one magneto-resistor being dependent on a magnetic field generated by the at least one magnetic field generating element, wherein said position detecting apparatus further comprises at least one resistance-to-current converting means to generate a current signal dependent on the resistance value of said at least one magneto-resistor.
Dependencies are inferred from the claim text.