Rangefinder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Aug 30, 2001
app pub date -
May 15, 2000
filing date -
May 17, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A rangefinder 10 comprises a light source 12 for emitting a luminous flux L1 having a predetermined beam diameter; interfering means 14 which is an object having an optical axis substantially perpendicular to a direction in which the object to be measured can be dislocated, the interfering means 14 having a transmission type diffraction grating 20 as one object for splitting the luminous flux L1 from the light source 12 into two diffraction luminous fluxes L2, L3 having respective directions different from each other, the two diffraction luminous fluxes L2, L3 being caused to impinge on a reflection type diffraction grating 22 as the other object, respective reflection luminous fluxes L2, L3 thereof being superposed on each other again by the transmission type diffraction grating 20 so as to interfere with each other; detecting means 16 for photoelectrically detecting interference light L4 obtained by the interfering means 14; and signal processing means 18 for measuring an intensity change and interference period of an interference signal obtained by the detecting means 16, and determining the dislocation of the object 22, 24 to be measured with reference to the reference object 20 from the intensity change and interference period of the interference signal.
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