US 4,415,273 AGranted

Microprocessor driven digital display alarm clock

AssigneeBraun GmbH

InventorsHarald Hoffman, Lothar Pacher, Peter Busch, Dan C. Raducanu

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Abstract

A microprocessor-based clock which has both a current time digital display and an alarm time digital display, as well as controls for setting both the current time and the alarm time either ahead or backward at selectable rates such that a single knob provides rapid setting of the setting time and a single knob provides rapid setting of the alarm time. An improved regulating circuit provides the microprocessor with a first substantially constant DC voltage and a second DC voltage limited to a given magnitude. User-accessable controls are provided for effecting a snooze alarm function, alarm setting and for disarming the alarm function for a relatively long period of time, e.g., for 24 hours. One of the controls includes strips bridgable by a conductive member such as a finger.

Claims10

Dependent claims

In an electronic clock provided with an alarm mechanism and capable of simultaneously displaying by electro-optical display means both a current time setting and an alarm time setting, that improvement which comprises:

first adjustment knob means for electronically adjusting said current time setting selectively either forward or backward at a selective plurality of predetermined rates by actuating said first adjustment knob means to one of a provided plurality of current time setting positions;
and
second adjustment knob means for electronically adjusting said alarm time setting selectively either forward or backward at a selective plurality of predetermined rates by actuating said second adjustment knob means to one of a provided plurality of alarm time setting positions;
whereby a single knob provides convenient and rapid one-handed setting said current time and a single knob provides convenient and rapid one handed setting of said alarm time.

1 more element

Dependencies are inferred from the claim text.