| 摘要 |
PROBLEM TO BE SOLVED: To improve safety with securement of a necessary amount of laser light. SOLUTION: A distance measuring device includes: a laser light source 2 emitting laser light; an optical element 3 substantially collimating the laser light emitted from the laser light source; a light projection mirror 4b, rotatable within a given angle range, which reflects the laser light substantially collimated by the optical element toward an object 100 to be measured to scan the object by the laser light; a light receiving mirror reflecting the laser light reflected and diffused by the object; a light receiving element receiving the laser light reflected by the light receiving mirror; a light collection optical system collecting the laser light reflected by the light receiving mirror to guide it to the light receiving element; and a control part calculating distance information on the object by processing light receiving signals created based on the laser light received by the light receiving element. A mask member 9 masking the laser light in a peripheral zone within an optical path is also arranged on the optical path between the laser light source and the object to be measured. COPYRIGHT: (C)2011,JPO&INPIT
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