Digital-to-digital correction unit for analog clock display

A clock device with an analog display and a time correction unit comprising an analog clock dial with an hour hand and a minute hand in proximity to, and parallel with, the clock dial;

• an hour-hand shaft connected to and supporting the hour hand;
• a minute-hand shaft connected to and supporting the minute hand;
• wherein the relative position of the hour hand and hour-hand shaft with respect to the analog clock dial is the angular position of the hour hand and hour-hand shaft;
• and wherein the relative position of the minute hand and minute-hand shaft with respect to the analog clock dial is the angular position of the minute hand and minute-hand shaft;
• an hour-hand digital encoder disk with peripheral cogs, encoded with information identifying the angular position of at least one of the hour-hand and the hour-hand shaft;
• a minute-hand digital encoder disk with peripheral cogs, encoded with information identifying the angular position of at least one of the minute-hand and minute-hand shaft;
• a first non-slip coupling, permanently attaching the center of the hour-hand digital encoder disk to the hour-hand shaft in a non-slip fashion;
• a second non-slip coupling, permanently attaching the center of the minute-hand digital encoder disk to the minute-hand shaft in a non-slip fashion;
• an hour-hand drive motor, attached to the hour-hand digital encoder disk with a cogwheel;
• a minute-hand drive motor, attached to the minute-hand digital encoder disk with a cogwheel;
• an hour-hand rotary encoder, comprised of at least one sensor capable of reading the angular position information from the hour-hand encoder disk;
• a minute-hand rotary encoder, comprised of at least one sensor capable of reading the angular position information from the minute-hand encoder disk;
• a circuit that converts the angular position information from the minute-hand rotary encoder and the angular position information from the hour-hand rotary encoder into a slave time code;
• a master time code from a digital clock source;
• a feedback circuit that controls the speed of the minute-hand drive motor and the hour-hand drive motor, so that the slave time code continuously equals the master time code;
• wherein the angular position information encoded on the minute-hand encoder disk is arranged in at least six concentric circles, with at least six discrete radii, corresponding to a BCD integer of at least six bits;
• and
• wherein the angular position information encoded on the hour-hand encoder disk is arranged in at least six concentric circles, with at least six discrete radii, corresponding to a BCD integer of at least six bits.