Digital clocks

Claim 2

A digital clock comprising a plurality of digit display means arranged to display times, a source of clock pulses, first means responsive to said clock pulses for producing a first output to operate said digit display means in a predetermined sequence, manual means including means for entering desired times to be displayed coupled to said first means to produce a second output from said first means to operate said first means in the same sequence but at a high speed for rapidly changing the time displayed by said digit display means, and coincidence means for comparing said times displayed by said digit display means and said desired times in said means for entering and for discontinuing said second output from said first means on coincidence.

Claim 3

A digital clock comprising a plurality of digit display means arranged to display times, a source of clock pulse of a predetermined frequency, a frequency divider for converting said clock pulse into a pulse of lower frequency, binary counter means for counting said pulse of lower frequency for operating said digit display means in a predetermined sequence, manually operated time setting means, means controlled by said manually operated time setting means for causing said binary counter means to count said clock pulse, a coincidence circuit for detecting the coincidence between the desired times in said manually operated time setting means and the content of said counter means and for controlling said controlled means to stop said binary counter means from counting said clock pulse.

Claim 4

A digital clock comprising a plurality of digit display means arranged to display times, a source of clock pulse of a predetermined frequency, a frequency divider for converting said clock pulse into a pulse of lower frequency, binary counter means for counting said pulse of lower frequency for operating said digit display means in a predetermined sequence, manually operated time setting means, means controlled by said manually operated time setting means for causing said binary counter means to count said clock pulse, a coincidence circuit for detecting the coincidence between the desired times in said manually operated time setting means and the content of said counter means and for controlling said controlled means to stop said binary counter means from counting said clock pulse.

Claim 5

The digital clock according to claim 2 wherein means is provided including logic input and manual switch to cause said clock to operate either a 24 o''clocks clock or a 12 o''clocks clock.

Claim 6

The digital clock according to claim 2 which further comprises display tubes for selectively displaying AM and PM.

Claim 7

The digital clock according to claim 4 which further comprises means for flickering the display of said AM and PM at a predetermined frequency.

Claim 8

The digital clock according to claim 2 wherein said digital display means comprises four luminous display tubes for displaying minutes, tens minutes, hours and tens hours respectively, each of said luminous display tubes including a plurality of luminous segments which are selectively energized to display any one of ten digits 0 through 9, and wherein said binary counter means comprises four serially connected binary counters each for controlling each of said luminous display tubes.

Claim 9

A digital clock comprising a plurality of digit display means adapted to display a time, a source of clock pulse of a predetermined high frequency, means for generating low frequency pulses from said source, counter means responsive to said low frequency pulse for producing in predetermined sequence outputs which in turn operate said plurality of digital display means, a plurality of manually operated time setting means for setting a desired time, manually operated switch means for causing said counter means to operate at a high speed by said clock pulse, and a coincidence circuit for detecting the coincidence between the outputs of said manually operated time setting means and said counter means and for disabling said manually operated switch means by the output of said coincidence circuit, whereby the time to be displayed on said plurality of digit display means is rapidly adjusted.

Claim 10

A digital clock comprising a plurality of digit display means adapted to display a time, a source of clock pulse of a predetermined high frequency, means for generating low frequency pulses from said source, counter means responsive to said low frequency pulse for producing in predetermined sequence outputs which in turn operate said plurality of digital display means, a plurality of manually operated time setting means for setting a desired time, manually operated switch means for causing said counter means to operate at a high speed by said clock pulse, and a coincidence circuit for detecting the coincidence between the outputs of said manually operated time setting means and said counter means and for disabling said manually operated switch means by the output of said coincidence circuit, whereby the time to be displayed on said plurality of digit display means is rapidly adjusted.