Driver circuit for a camera autofocus laser diode with provision for fault protection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 12, 1998
Issued Date -
N/A
app pub date -
Feb 28, 1997
filing date -
Jan 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A laser diode current drive control circuit including a drive circuit supplying a modulated laser diode current drive signal, a laser diode drive current source having a switch responsive to the drive circuit for controlling flow of drive current to the laser diode. The control circuit is further provided with one or more fault sensing circuits coupled to the diode current switch and responsive to a fault condition in the operation of the diode that would cause the diode power output to exceed a predetermined maximum safety limit to open the switch thereby terminating the flow of diode drive current. A feedback sensing circuit operating synchronously with the current drive signal is effective to open the switch when a normal feedback control signal is lost. A drive signal sensing circuit is effective to open the switch when integrated power output of the laser diode exceeds a safety related limit value. The fault sensing circuits are integral with the laser drive circuit and operate independently of the separate controller circuits.
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