Detection device of electronic timepiece
First Claim
1. A device for use with an electronic timepiece and the like comprising:
- a stepping motor having a stator, rotor and driving coil;
means for generating at least two kinds of driving pulses each effective when applied to the driving coil to rotationally drive the rotor under different operating conditions;
means for detecting rotation and non-rotation of the rotor;
means for detecting an external alternating magnetic field; and
control means for selecting at least one kind of driving pulse for application to the driving coil in response to the detection of rotation and non-rotation of the rotor and the detection of an external alternating magnetic field.
1 Assignment
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Accused Products
Abstract
An electronic timepiece has a stepping motor comprised of a stator, rotor and driving coil. A wave shaping circuit produces normal driving pulses and correction driving pulses having a longer pulse width than the normal driving pulses. A rotor rotation detection device detects rotation and non-rotation of the rotor after normal driving pulses are applied to the driving coil and in response to detection of a non-rotation condition, a correction driving pulse is applied to the driving coil. A magnetic field detection device detects the presence and absence of an external alternating magnetic field and in response to detection of a magnetic field, a driving pulse of longer pulse width than the correction driving pulses is applied to the driving coil to effect rotor rotation. The magnetic field detection device operates before the normal driving pulses are applied to the driving coil so that in the event of detection of a magnetic field, a driving pulse of sufficiently long pulse width will be applied to the driving coil to effect rotor rotation. In response to detection of an external alternating magnetic field by the magnetic field detection device, operation of the rotor rotation detection device is inhibited thereby conserving power and preventing mis-operation of the stepping motor.
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Citations
17 Claims
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1. A device for use with an electronic timepiece and the like comprising:
- a stepping motor having a stator, rotor and driving coil;
means for generating at least two kinds of driving pulses each effective when applied to the driving coil to rotationally drive the rotor under different operating conditions;
means for detecting rotation and non-rotation of the rotor;
means for detecting an external alternating magnetic field; and
control means for selecting at least one kind of driving pulse for application to the driving coil in response to the detection of rotation and non-rotation of the rotor and the detection of an external alternating magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a stepping motor having a stator, rotor and driving coil;
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9. In an electronic timepiece having a stepping motor comprised of a stator, rotor and driving coil:
- means for generating at least one kind of normal driving pulses, correction driving pulses having greater effective power than any of said normal driving pulses, and anti-magnetic driving pulses having greater effective power than said correction driving pulses;
means for normally applying one of the normal driving pulses to the driving coil in successive predetermined time periods to effect rotation of the rotor;
first detecting means operable during each predetermined time period for detecting rotation and non-rotation of the rotor after the application of one normal driving pulse to the driving coil;
second detecting means operable during each predetermined time period for detecting the presence of an external alternating magnetic field before the application of one normal driving pulse to the driving coil; and
control means responsive to the detection of non-rotation of the rotor by said first detecting means for effecting the application of a correction driving pulse to the driving coil within the same predetermined time period in which the non-rotation was detected to thereby effect rotor rotation and responsive to the detection of an external alternating magnetic field by said second detecting means for effecting the application of an anti-magnetic driving pulse to the driving coil within the same predetermined time period in which the external alternating magnetic field was detected to thereby effect rotor rotation. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- means for generating at least one kind of normal driving pulses, correction driving pulses having greater effective power than any of said normal driving pulses, and anti-magnetic driving pulses having greater effective power than said correction driving pulses;
Specification