Communications: electrical – Systems – Plural
Patent
1994-10-19
1997-02-11
Crosland, Donnie L.
Communications: electrical
Systems
Plural
340330, 3403841, 3403846, 368 72, 368223, 368255, G08B 2700
Patent
active
056025211
ABSTRACT:
An electronic device with a display having a light source, such as an electroluminescent element, becomes easier to see and is reduced in size and power consumption when a single boosting element is used for selectively driving the light source and an additional element, such as an alarm. A sound generating circuit charges and discharges with a boosted voltage a charge boosting element, such as a piezoelectric element, in accordance with a control signal supplied by an alarm signal generating circuit. A light source disable circuit discriminates when a signal is being output by an alarm signal generating circuit, and disables a boosting circuit and a discharge circuit used for driving the light source, respectively. The light source disable circuit distinguishes between a driving pulse for driving a light source such as an electroluminescent element to light a display and a control signal from an alarm signal generating circuit for driving a piezoelectric element to sound a buzzer, thereby enabling the selective lighting of the display or the generation of an alarm with only one boosting element.
REFERENCES:
patent: 4288784 (1981-09-01), Fusco
patent: 4499453 (1985-02-01), Right
patent: 4518946 (1985-05-01), Solomon
patent: 4982141 (1991-01-01), Pace et al.
patent: 5132659 (1992-07-01), Kuo
Crosland Donnie L.
Seiko Instruments Inc.
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