An electronic wristwatch in which time is displayed by means of a plurality of separately sealed, independently rotatable, coplanar concentric rings. Each ring carries a plurality of magnetic domains and is independently stepped by a set of electromagnets driven by a multiphase pulse train. Typically, each ring is stepped at a different rate so as to display a different unit of time, this being achieved by suitably scaling the frequencies of the multiphase pulse trains which drive the different sets of electromagnets.
A memory mechanism for controlling incremental change of informations in a plurality of information systems to be indicated successively in turn. The mechanism comprises actuation means adapted to be actuated in response to an input signal each time said actuation means receives such a signal, a first memory wheel operated by said actuation means to incrementally change the informations in the first system of said plurality of informations systems and having an intermittent transmission means, a first transmission wheel for engaging said intermittent transmission means, a second memory wheel including a second transmission wheel and adapted to incrementally change the informations in the second information system of said plurality of information systems, a first camming portion formed on said first memory wheel, second camming portions formed on said second memory wheel, lever means acting on said first and second camming portions and adapted to be operated during the lever means is in engagement with both said first and a selected one of said second camming portions and operation means operatively connected to said lever means to operate said first memory wheel so as to allow the first memory wheel to effect incremental information change in said first information system independent of said input signal during said lever is operating whereby incremental change of the informations in the first information system is controlled.
A multi-position electromagnetically actuated display element suitable for use in a matrix arrangement to display user-selected messages is disclosed. The element is indexed to display a selected face by energizing one of a plurality of stator coils, the energized coil then attracting a pole of a magnet disposed outwardly of the stator and affixed to the viewing faces. Mounting structures and drive circuitry are disclosed suitable for arranging the element in a matrix display and causing the elements in the matrix to display user-selected messages. Alternative embodiments are disclosed.
An advertising display including a display object, a motor connected to the display object for rotating the object about a rotation axis, and a control circuit coupled to the motor. The control circuit includes a direct current energy source, and an oscillator connected to the energy source for generating a predetermined series of regularly timed energy pulses having a selected frequency and duty cycle to cause excitation of the motor in response to the energy pulses.
