Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-10-02
1991-03-26
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250342, 340693, G08B 2300
Patent
active
050032933
ABSTRACT:
A message spreading apparatus is disclosed to generate an audio message output in response to the presence of a heat radiation generated by body heat. A housing has a front wall provided with an opening therein and a rear wall including a first portion opposed to the opening of the front wall, with the front wall and the rear wall being spaced a predetermined distance from each other. A radiation reflecting member is mounted to the first portion of the rear wall and is configured and arranged so as to reflect a portion of a heat radiation ray entered through the opening of the front wall to a path which is between the front wall and the rear wall and is in a direction substantially parallel to the respective planes of the front and rear walls. A pyroelectric sensor is provided in the path to sense the reflected heat radiation ray and generate an activating signal in response to the reflected heat radiation ray. An audio circuit is also located between the front and rear walls and is operatively coupled to the pyroelectric sensor for generating an audio message output in response to the activating signal. In an alternative embodiment, a photo-sensor is adopted to actuate the audio message output by sensing the variance in the luminosity of a light beam entered through the opening of the front wall.
REFERENCES:
patent: 4645930 (1987-02-01), Zierhut
patent: 4709153 (1987-11-01), Schofield
patent: 4709330 (1987-11-01), Yokoi et al.
patent: 4710629 (1987-12-01), Muller et al.
patent: 4853678 (1989-08-01), Bishop, Jr. et al.
Compunic Electronics Co., Ltd.
Mullen Jr. Thomas J.
Swann III Glen R.
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