Pulse motor driving device, pulse motor driving method, timepiece device, and timepiece device control method

A pulse motor driving device comprising:

• a magnetic field detecting circuit that detects a magnetic field in a vicinity of a pulse motor;
• a control circuit that controls an effective value of a driving power of said pulse motor;
• and
• a rotation detecting circuit that detects whether or not said pulse motor rotates,
• wherein said control circuit is adapted to perform an operation of increasing the effective value of the driving power of said pulse motor when said rotation detecting circuit detects that the pulse motor does not rotate, and repeatedly performs an operation of lowering the effective value of the driving power of said pulse motor, and wherein said control circuit is adapted to interrupt the operation of lowering the effective value of the driving power of said pulse motor when a magnetic field is detected by said magnetic field detecting circuit.

A pulse motor driving method comprising the steps of:

• detecting a magnetic field in a vicinity of a pulse motor;
• controlling an effective value of a driving power of said pulse motor;
• and
• detecting whether or not the pulse motor rotates, wherein an operation of increasing the effective value of the driving power of the pulse motor is performed when it is detected that the pulse motor does not rotate, wherein an operation of lowering the effective value of the driving power of said pulse motor is repeatedly performed, and wherein the operation of lowering the effective value of the driving power of the pulse motor is interrupted when a magnetic field is detected by said magnetic detecting circuit.

A timepiece device comprising:

• a pulse motor for performing an operation of moving hands;
• magnetic field detecting means for detecting a magnetic field in a vicinity of said pulse motor;
• control means for controlling an effective value of a driving power of said pulse motor;
• and
• rotation detecting means for detecting whether or not the pulse motor rotates,
• wherein said control means is adapted to perform an operation of increasing the effective value of the driving power of said pulse motor when said rotation detecting means detects that said pulse motor does not rotate, and repeatedly performs an operation of lowering the effective value of the driving power of said pulse motor, and
• wherein said control means is adapted to interrupt the operation of lowering the effective value of the driving power of said pulse motor when a magnetic field is detected by said magnetic field detecting means, and adapted to force said pulse motor to rotate.

A timepiece device having a motor, which is driven according to electric power supplied from an electromagnetic generator, comprising:

• AC magnetic field detecting means for detecting an AC magnetic field generated around said electromagnetic generator;
• and
• duty ratio control means for controlling a duty ratio to be used to drive said motor according to a result of a detection by said AC magnetic field detecting means,
• wherein said duty ratio control means has duty ratio setting means adapted to maintain the duty ratio of a normal driving pulse signal at a currently set value or set the duty ratio at a value, which is higher than the currently set value, when an AC magnetic field is detected by said AC magnetic field detecting means.

A timepiece device control method for controlling a timepiece device having a motor driven according to electric power, which is supplied from an electromagnetic generator, said method comprising:

• an AC magnetic field detecting step of detecting an AC magnetic filed generated around said electromagnetic generator;
• and
• a duty ratio control step of controlling a duty ratio of a normal driving pulse signal, which is used for driving said motor, according to a result of detecting a magnetic field at said AC magnetic field detecting step,
• wherein said duty ratio control step has a duty ratio setting step of maintaining the duty ratio of the normal driving pulse signal at a current set value or setting the duty ratio thereof at a value higher than the currently set value when an AC magnetic field is detected by said AC magnetic field detecting step.

A timepiece device having a motor, which is driven according to electric power supplied from an electromagnetic generator, said timepiece device comprising:

• a power storing unit that stores electric power supplied from said electromagnetic generator;
• a charge detector that detects charging of said power storing unit;
• and
• a duty ratio setting unit that sets a duty ratio of a normal driving pulse to be outputted to said motor at a value that is not less than a value of a predetermined set lower limit duty ratio, which is higher than a lowest duty ratio, which has a lowest value for driving said motor, when charging is detected by said charge detector.

A timepiece device having a motor, which is driven according to electric power supplied from an electromagnetic generator, said timepiece device comprising:

• power storing means for storing electric power supplied from said electromagnetic generator;
• a charging detecting means for detecting charging;
• and
• a duty ratio setting means for setting a duty ratio of a normal driving pulse to be outputted to said motor at a value that is not less than a value of a predetermined set lower limit duty ratio, which is higher than a lowest duty ratio, which has a lowest value for driving said motor, when charging is detected by said charge detecting means.

A timepiece device having a motor, which is driven according to electric power supplied from an electromagnetic generator, comprising:

• an AC magnetic field detecting circuit that detects an AC magnetic field generated around said electromagnetic generator;
• and
• a duty ratio control unit that controls a duty ratio to be used to drive said motor according to a result of a detection by said AC magnetic field detecting circuit,
• wherein said duty ratio control unit has a duty ratio setting unit that maintains the duty ratio of a normal driving pulse signal at a currently set value or sets the duty ratio at a value, which is higher than the currently set value, when an AC magnetic field is detected by said AC magnetic field detecting circuit.