Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1995-07-28
1997-06-17
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502016, 356 306, 396 80, G01J 120
Patent
active
056400055
ABSTRACT:
An inexpensive and easily adjustable distance measuring apparatus judges whether an object is located at a far distance or at a near distance relative to a certain set distance. The distance measuring apparatus comprises an oscillator for generating pulses, a light emitting element for emitting light for a predetermined time in synchronization with the pulses generated by the oscillator, a plurality of light receiving elements disposed adjacent to each other to receive reflected light emitted by the light emitting element and reflected by an object whose distance is to be measured, a plurality of delay circuits connected to respective ones of the light receiving elements, and a phase discriminating circuit for comparing the phases of the output signals of each of the delay circuits. To minimize misjudgments caused by noise and unclear judgment in the case the object is located at the boundary between the far and near distances, a majority decision circuit is connected to the phase discriminating circuit for counting the High and Low output levels of the phase discriminating circuit during each predetermined time period to output a signal having a level corresponding to that which occurred most often during the predetermined time period.
REFERENCES:
patent: 4942561 (1990-07-01), Ohishi et al.
patent: 5082363 (1992-01-01), Nakanishi et al.
patent: 5157435 (1992-10-01), Min et al.
patent: 5204714 (1993-04-01), Nonaka et al.
patent: 5329467 (1994-07-01), Nagamune et al.
Le Que
Seiko Precision Inc.
LandOfFree
Active trigonometrical distance measuring apparatus with delay c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active trigonometrical distance measuring apparatus with delay c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active trigonometrical distance measuring apparatus with delay c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2159765