Alarm clock having an ambient light detector

Details Alarm clock having an ambient light detector Alarm clock having an ambient light detector

1993-09-01

1994-10-25

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

368 68, 368 72, G04B 1922, G04B 2302

Patent

active

053595777

ABSTRACT:
An alarm clock has an ambient light detector for controlling the illumination of a time displaying section. An alarm time which is selected by a user is stored in a memory. An alarm set switch is used to switch between alarm-on and alarm-off conditions. A photosensor detects the ambient light surrounding the alarm clock. The illumination of the displaying section is controlled so that the displaying section is illuminated only when the current time is within a predetermined time zone before the alarm time set by the user, the alarm set switch is in the alarm-on condition and the detected ambient light is below a predetermined level. The illumination of the displaying section is also controlled so that the display is illuminated while an alarm sound is being generated. The time at which the user switches the alarm set switch to the alarm-on condition can be stored, and the illumination of the displaying section is controlled so that the displaying section is illuminated after a predetermined amount of time has elapsed after the alarm set switch has been switched to the alarm-on condition.

REFERENCES:
patent: 4091611 (1978-05-01), Fukuichi
patent: 4114366 (1978-09-01), Benner et al.
patent: 4912688 (1990-03-01), Sifert
patent: 4995016 (1991-02-01), Vatanase
Patent Abstracts of Japan, vol. 8, No. 6 (P-247) Jan. 12, 1984.
Patent Abstracts of Japan, vol. 5, No. 146 (P-80) Sep. 16, 1981.

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