Electromagentic wave generating device and a distance measuring

Optics: measuring and testing – Range or remote distance finding – With photodetection

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356 309, 356 6, G01C 308

Patent

active

055151566

ABSTRACT:
A safety distance measuring device employing an electromagnetic wave is provided. A laser diode 2 is energized to emit laser beams by a laser diode drive circuit 3 in accordance with a clock signal generated by a control circuit 29. The emitted laser beams are sequentially changed to predetermined scanning directions by a scanner 1 associated with control circuit 29. The scanned laser beams from scanner 1 are reflected by an object 19 to be received by a photodiode 5. An output of the photodiode is applied to control circuit 29 through a light receiving circuit 6 where an elapsed time from emission to receipt is computed to obtain a distance from scanner 1 to object 19. Based on data relating to scanning directions by a scanning position detector 4, a begin-and-end detecting circuit 28 can stop the radiation of electromagnetic waves around a scanning start point and a scanning end point which is danger to human bodies.

REFERENCES:
patent: 5283622 (1994-02-01), Ueno et al.
"Patent Abstract of Japan," vol. 14, No. 150 (P-1025) 22 Mar. 1990 (JP-A-02 010 282).
"Patent Abstract of Japan," vol. 17, No. 132 (P-1504) 18 Mar. 1993 (JP-A-04 310 890).

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