Multicolor display apparatus

A method for driving a multicolor display element having a rotary member with a plurality of separate display regions of different colors for displaying one of the colors at a time, the rotary member having a shaft to which the rotary member is fixedly mounted, a support member for rotatably supporting the shaft, drive means coupled to the support member for rotating the rotary member, the drive means including,

• a permanent circular magnet, having a circular peripheral side surface, fixed to the shaft to rotate with the rotary member,
• a plurality of stators coupled to the support members and arranged close to and around the circular peripheral side surface of the permanent circular magnet so as to substantially surround the circular peripheral side surface thereof, each one of said plurality of stators having an arcuate inner side surface which is provided on a portion of each said stator opposite said circular peripheral side surface of said magnet, said arcuate inner side surface having a uniform radius from the center of said magnet, said plurality of stators being mutually arranged in an identical plane with a first clearance formed between said circular peripheral side surface of said magnet and said arcuate inner side surface of each said respective stator, said first clearance being uniform along the overall peripheral side surface of said magnet, each of the plurality of stators Including a magnetizable core with a magnetizing coil wound thereon, said method comprising:
• applying a driving waveform having a first phase or a first amplitude to one set of the magnetizing coils of a display element,
• applying a driving waveform having a second phase delayed from the first phase or a second amplitude smaller than the first amplitude to another set of the magnetizing coils of said display element, and
• selectively polarizing the cores in response to the magnetization of the coils by the first and second phase waveforms or by the first and second amplitude waveforms to restrict the direction of rotation of the magnet to one direction at times when the magnet is turned 180 degrees to display a selected display region.

A method for driving a multicolor display element which comprises;

• a rotary member having a plurality of separate display regions of different colors, for displaying one of the colors at a time, the rotary member having a shaft to which the rotary member is fixedly mounted, a support member for rotatably supporting the shaft, drive means coupled to the support member for rotating the rotary member, the drive means including,
• a permanent circular magnet having a circular peripheral side surface fixed to the shaft to rotate with the rotary member,
• a plurality of stators coupled to the support member, and arranged close to and around the circular peripheral side surface of the permanent circular magnet so as to substantially surround the circular peripheral side surface thereof, each one of said plurality of stators having an arcuate inner side surface which is provided on a portion of each said stator opposite said circular peripheral side surface of said magnet, said arcuate inner side surface having a uniform radius from the center of said magnet,said plurality of stators being mutually arranged in an identical plane with a first clearance formed between said circular peripheral side surface of said magnet and said arcuate inner side surface of each said respective stator, said first clearance being uniform along the overall peripheral side surface of said magnet, each of the plurality of stators including a magnetizable core with a magnetizing coil wound thereon;
• the method comprising:
• applying to said magnetizing coils a driving waveform corresponding to the first 90 degree turn and a second driving waveform corresponding to a second 90 degree turn to polarize the coils to cause the rotary member to rotate 180 degrees to display a selected display region.

A method for driving a multicolor display element having a rotary member having a plurality of separate display regions of different colors for displaying one of the colors at a time, the rotary member having a shaft to which the rotary member is fixedly mounted,

• a support member for rotatably supporting the shaft, drive means coupled to the support member for rotating the rotary member, the drive means including
• a permanent circular magnet, having a circular peripheral side surface, fixed to the shaft to rotate with the rotary member,
• a plurality of stators coupled to the support member and arranged close to and around the circular peripheral side surface of the permanent circular magnet so as to substantially surround the circular peripheral side surface thereof, each one of said plurality of stators having an arcuate inner side surface which is provided on a portion of each said stator opposite said circular peripheral side surface of said magnet, said arcuate inner side surface having a uniform radius from the center of said magnet, said plurality of stators being mutually arranged in an identical plane with a first clearance formed between said circular peripheral side surface of said magnet and said arcuate inner side surface of each said respective stator, said first clearance being uniform along the overall peripheral side surface of said magnet, each of the plurality of stators including a magnetizable core with either a magnetizing coil or a pair of a magnetizing coil and a detection coil wound thereon;
• said method comprising:
• applying to the magnetizing coils of the plurality of stators a driving waveform to selectively polarize the cores to rotate the magnet causing the rotary member to display a selected region;
• detecting a voltage induced by a magnetic field change in the magnetizing or detection coils in response to rotation of the magnet;
• amplifying and applying the detected induced voltage as a braking pulse to the magnetizing coils to limit rotation of the rotary member.

A method for driving a multicolor display element which comprises;

• a rotary member having a plurality of separate display regions of different colors, for displaying one of the colors at a time, the rotary member having a shaft to which the rotary member is fixedly mounted;
• a support member for rotatably supporting the shaft;
• drive means coupled to the support member for rotating the rotary member, the drive means including
• a permanent circular magnet, having a circular peripheral side surface, fixed to the shaft to rotate with the rotary member,
• a plurality of stators coupled to the support member, and arranged close to and around the circular peripheral side surface of the permanent circular magnet so as to substantially surround the circular peripheral side surface thereof, each one of said plurality of stators having an arcuate inner side surface which is provided on a portion of each said stator opposite said circular peripheral side surface of said magnet, said arcuate inner side surface having a uniform radius from the center of said magnet, said plurality of stators being mutually arranged in an identical plane with a first clearance formed between said circular peripheral side surface of said magnet and said arcuate inner side surface of each said respective stator, said first clearance being uniform along the overall peripheral side surface of said magnet, each of the plurality of stators including a magnetizable core with either a magnetizing coil or a pair of a magnetizing coil and a detection coil wound thereon;
• said method comprising:
• applying to the magnetizing coils of the plurality of stators a driving waveform to selectively polarize the cores to rotate the magnet causing the rotary member to display a selected region;
• detecting a voltage induced by a magnetic field change in the magnetizing or detection coils in response to rotation of the magnet to detect erroneous operation of the motor;
• and
• repeating the application of the driving waveform in response to the said erroneous detection.