Electronic timepiece
First Claim
Patent Images
1. An electronic timepiece comprising in combination:
- a stepping motor including a stator, a drive coil and a rotor;
drive means for driving the stepping motor in one of at least two different states; and
means for changing the state of the drive means in response to a change in the load of the motor and in response to the location of the motor in an external magnetic field.
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Abstract
An electronic timepiece includes a stepping motor having a stator, a drive coil and a rotor which is driven in one of at least two different states. The state of the driving motor is changed in response to a change in the load of the motor or in response to the locating of the motor in an external magnetic field.
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Citations
11 Claims
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1. An electronic timepiece comprising in combination:
- a stepping motor including a stator, a drive coil and a rotor;
drive means for driving the stepping motor in one of at least two different states; and
means for changing the state of the drive means in response to a change in the load of the motor and in response to the location of the motor in an external magnetic field. - View Dependent Claims (2, 3)
- a stepping motor including a stator, a drive coil and a rotor;
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4. In an electronic timepiece having a stepping motor including a stator, a rotor and a driving coil, the improvement comprising:
- means defining a periodic normal driving time period for the rotor and a periodic rest time period thereafter in which the rotor is at rest independent of the rotation or non-rotation state thereof;
means for producing normal driving pulses and magnetic field correction pulses having greater effective power than the normal driving pulses and present during the normal driving periods;
means for detecting an external magnetic field during the rest time periods; and
means for driving the coil with the normal driving pulses when no external magnetic field is detected and with the magnetic field correction pulses when an external magnetic field is detected. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
- means defining a periodic normal driving time period for the rotor and a periodic rest time period thereafter in which the rotor is at rest independent of the rotation or non-rotation state thereof;
Specification