Electronic clock having time indicating light display

Details Electronic clock having time indicating light display Electronic clock having time indicating light display

1976-01-08

1977-08-16

Witkowski, Stanley J.

58127R, G04B 1934, G04C 300

Patent

active

040416925

ABSTRACT:
An electronic clock is disclosed having a time indicating light display on the clock face with the light display being provided by a plurality of light emitting diodes positioned to form three spaced concentric rings for separately indicating time in seconds, minutes and hours. An input signal having a frequency of 60 hertz is frequency divided to provide a signal having a frequency of one hertz that is coupled to a seconds decoder connected to a first 6.times.10 LED matrix. One pulse per minute is provided from the seconds decoder to a minutes decoder that is connected to a second 6.times.10 LED matrix, and one pulse per hour is provided from the minutes decoder to an hours decoder that is connected with a 1.times.12 LED matrix. Each of the outer and middle concentric rings at the clock face includes 60 LEDs while the inner ring includes 12 LEDs with energization of an LED in the inner ring indicating the hour, energization of an LED in the middle ring indicating the minute, and energization of an LED in the outer ring indicating the second. The decoders utilize multistage Johnson counters which enable the use of the needed LED matrix, and circuitry is also provided for holding the second indication while advancing the minute and hour indications for setting the clock. A light simulated pendulum is provided for the electronic clock by successive energization of a plurality of LEDs positioned in an arc. For pendulum simulation, a multiplexer receiving the outputs from a counter is connected with a 1.times.10 LED matrix.

REFERENCES:
patent: 1096778 (1914-05-01), Clement
patent: 3456152 (1969-07-01), Andersen
patent: 3540209 (1970-11-01), Zatsky et al.
patent: 3772874 (1973-11-01), Lefkowitz
patent: 3958409 (1976-05-01), Manber

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