Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate
2005-05-03
2005-05-03
Lieu, Julie B. (Department: 2636)
Communications: electrical
Condition responsive indicating system
With particular system function
C340S635000, C340S657000, C340S659000, C340S664000, C324S537000, 63
Reexamination Certificate
active
06888454
ABSTRACT:
A fault diagnosis circuit of the present invention includes: LED indicating units3a,3b, and so forth; current detecting circuits R1and Q1for detecting a flowing current by flowing a short-time pulse of a current through the LED indicating units3a,3b, and so forth based on pulses generated by a pulse generating circuit7; comparing circuits8and9for comparing a current value detected by the current detecting circuits R1and Q1with their respective threshold values to judge a disconnection and a short-circuit; and retaining circuits10and11for generating a signal and retaining the signal when the current value is judged as being smaller and larger than the respective threshold values as a result of comparisons by the corresponding comparing circuits8and9. Thus, it is possible to indicate a fault in an LED indicating light to the outside while making the turning ON of an LED unperceivable.
REFERENCES:
patent: 6147617 (2000-11-01), Kim
patent: 6490512 (2002-12-01), Niggemann
patent: 20020140380 (2002-10-01), Biebl
patent: 20030133491 (2003-07-01), Shih
patent: 5-038703 (1993-05-01), None
Koda & Androlia
Lieu Julie B.
Patlite Corporation
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