Alarm device
First Claim
Patent Images
1. An alarm device adapted to be fixed to an article, for giving an alarm in response to unauthorized movement of the article, the alarm device comprising:
- motion detection means;
means for producing an alarm;
logic and timing means, responsive to said motion detection means, for causing said alarm means to produce an alarm only if;
(a) the motion detection means detects an initial motion; and
(b) the motion detection means detects a predefined pattern of continual motion following said initial motion, andmeans for reducing the electrical current demand of said logic and timing means if no motion is detected by said detection means within a predetermined interval following detection of said initial motion.
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Accused Products
Abstract
An anti-theft alarm to be concealed within an article likely to be stolen causes an alarm such as release of smoke, tear gas, dye. The alarm is responsive to continual motion and requires an initial motion followed by motion in each of a series of intervals following the initial motion.
44 Citations
9 Claims
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1. An alarm device adapted to be fixed to an article, for giving an alarm in response to unauthorized movement of the article, the alarm device comprising:
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motion detection means; means for producing an alarm;
logic and timing means, responsive to said motion detection means, for causing said alarm means to produce an alarm only if;(a) the motion detection means detects an initial motion; and (b) the motion detection means detects a predefined pattern of continual motion following said initial motion, and means for reducing the electrical current demand of said logic and timing means if no motion is detected by said detection means within a predetermined interval following detection of said initial motion.
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2. An alarm device adapted to be fixed to an article, for giving an alarm in response to unauthorized movement of the article, the alarm device comprising:
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motion detection means; means for producing an alarm; and logic and timing means, responsive to said motion detection means, for causing said alarm means to produce an alarm only if; (a) the motion detection means detects an initial motion; and (b) the motion detection means detects motion in each of a plurality of predetermined successive intervals following said initial motion. - View Dependent Claims (3, 4, 5)
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6. An alarm device adapted to be fixed to an article, for giving an alarm in response to unauthorized movement of the article, the alarm device comprising:
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motion detection means; means for producing an alarm; timing means for establishing a first predetermined interval and a second predetermined interval, the second predetermined interval consisting of a succession of predetermined sub-intervals, and for causing said alarm producing means to produce an alarm following the end of said second predetermined interval; and logic means, responsive to said motion detection means, for controlling said timing means so that the timing means begins said first predetermined interval after detecting an initial motion, initiates said second predetermined interval upon detecting additional motion within said first predetermined interval, and produces said alarm only if; (a) the motion detection means detects said initial motion; and (b) the motion detection means detects additional motion during said first predetermined interval; and (c) the motion detection means detects motion in each of said sub-intervals. - View Dependent Claims (7, 8, 9)
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Specification