ERRONEOUS DETECTION RESTRAINING CIRCUIT FOR LASER RANGE FINDER

摘要

In a laser range finder, each reflected light reflected by at least one object of pulsed laser light emitted by a light emitting element reaches a light receiving element, and distance information to the at least one object is acquired based on an amount of time from a light emission starting time for the pulsed laser light to an output starting time from the light receiving element. An erroneous detection reducing circuit for the laser range finder includes: a comparator receiving as inputs a threshold and a light-reception output from the light receiving element; a time measuring section measuring time elapsed since the light emission starting time for the pulsed laser light; and a setting changing section changing either one or both of the threshold and an amplification factor of the comparator for the light-reception output in accordance with a time measurement value obtained by the time measuring section.

主权项

1. An erroneous detection restraining circuit for a laser range finder in which each reflected light reflected by at least one object of pulsed laser light emitted by a light emitting element reaches a light receiving element, and distance information to the at least one object is acquired based on an amount of time from a light emission starting time for the pulsed laser light to an output starting time from the light receiving element,
the erroneous detection restraining circuit comprising: a comparator configured to receive as inputs a threshold and a light-reception output from the light receiving element a time measuring section configured to measure time elapsed since the light emission starting time for the pulsed laser light; and a setting changing section configured to change either one or both of the threshold and an amplification factor of the comparator for the light-reception output in accordance with a time measurement value obtained by the time measuring section.