Passive-type infrared sensor system for detecting human body
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 30, 1997
Grant Date -
N/A
app pub date -
May 30, 1996
filing date -
Oct 4, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A passive-type infrared sensor system includes first and second sensor units each including a first or second light receiving element and a first or second optical system. The first sensor unit has a 'viewing' direction oriented towards an upper half of a human body so as to define a first watch area clear of a ground surface. The second sensor unit has a similar 'viewing' direction oriented diagonally downwardly towards a point on the ground surface spaced a predetermined watch distance away from where it is installed so as to define a second predetermined watch area below the first watch area. This passive-type infrared sensor system also includes first and second level detecting circuits each operable to output a detection signal only when the level of an electric output signal from the associated first or second sensor unit exceeds a predetermined reference level, and a human detecting circuit for outputting, when the detection signals are outputted respectively from the first and second level detecting circuits, a human detection signal indicative of entry of a human body within a monitoring zone including the first and second watch areas.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully