Electromagentic wave generating device and a distance measuring device
First Claim
1. A distance measuring device comprisingmeasurement electromagnetic wave scanning means for radiating a measurement electromagnetic wave with scanning from a scanning start point to a scanning end point,electromagnetic wave detecting means for detecting the radiated measurement electromagnetic wave which is reflected on a reflection point of an object to be detected thereby,operation means for measuring an elapsed time from emission to detection of the electromagnetic wave and for calculating a distance between said measurement electromagnetic wave scanning means and said reflection point based on the measured elapsed time, andradiation attenuation means for attenuating the radiation of the measurement electromagnetic waves around said scanning start point and said scanning end point.
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Accused Products
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.
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Citations
12 Claims
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1. A distance measuring device comprising
measurement electromagnetic wave scanning means for radiating a measurement electromagnetic wave with scanning from a scanning start point to a scanning end point, electromagnetic wave detecting means for detecting the radiated measurement electromagnetic wave which is reflected on a reflection point of an object to be detected thereby, operation means for measuring an elapsed time from emission to detection of the electromagnetic wave and for calculating a distance between said measurement electromagnetic wave scanning means and said reflection point based on the measured elapsed time, and radiation attenuation means for attenuating the radiation of the measurement electromagnetic waves around said scanning start point and said scanning end point.
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7. A distance measuring device comprising
measurement electromagnetic wave scanning means for radiating a measurement electromagnetic wave with scanning from a scanning start point to a scanning end point by changing a scanning angular speed, electromagnetic wave detecting means for detecting said radiated measurement electromagnetic wave reflected by a reflection point of an object to be detected, operating means for measuring an elapsed time from emission to detection of said measurement electromagnetic wave and for calculating a distance between said measurement electromagnetic wave scanning means and said reflection point based on the measured elapsed time, and radiation level controlling means for controlling the radiation level of electromagnetic radiation means in proportion to the absolute value of a scanning angular speed.
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8. An electromagnetic wave generating device comprising
electromagnetic wave emitting means for emitting an electromagnetic wave, emission direction controlling means for controlling an emission direction of said electromagnetic wave emitted by said electromagnetic wave generating device, angular speed detecting means for detecting an angular speed of the emission direction varied with said emission direction controlling means, and electromagnetic wave power controlling means for decreasing an electromagnetic wave power emitted by said electromagnetic wave emitting means as the angular speed detected by said angular speed detecting means decreases.
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11. An electromagnetic wave generating device comprising
an electromagnetic wave emitter for emitting an electromagnetic wave, an emission direction controller for controlling an emission direction of said electromagnetic wave emitted by said electromagnetic wave generating device, an angular speed detector for detecting an angular speed of the emission direction varied with said emission direction controlling means, and an electromagnetic wave power controller for decreasing an electromagnetic wave power emitted by said electromagnetic wave emitting means as the angular speed detected by said angular speed detecting means decreases.
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12. A method of an electromagnetic wave emission comprising the steps of
emitting an electromagnetic wave, controlling an emission direction of said electromagnetic wave emitted by said electromagnetic wave generating device, detecting an angular speed of the emission direction varied with said emission direction controlling means, and decreasing an electromagnetic wave power emitted by said electromagnetic wave emitting means as the angular speed detected by said angular speed detecting means decreases.
Specification