Displacement detecting device and optical instrument having...

Details Displacement detecting device and optical instrument having... Displacement detecting device and optical instrument having...

2009-02-23

2010-11-09

Punnoose, Roy (Department: 2886)

Optics: measuring and testing

Position or displacement

Reexamination Certificate

active

07830531

ABSTRACT:
A displacement detecting device includes a light source for projecting light to an object to be examined, the light source being movable relative to the object to be examined, a first reflecting element being fixed to the object to be examined and including a reflection portion for reflecting light from the light source and a non-reflection portion, a first light receiving element for receiving light reflected by the first reflecting element, a second reflecting element fixed to the object to be examined and including a reflection portion for reflecting light from the light source and a non-reflection portion, and a second light receiving element for receiving light reflected by the second reflecting element, wherein the second reflecting element is disposed at a light path through which at least a portion of light from the light source and advancing via the first reflecting element is directed to the second light receiving element.

REFERENCES:
patent: 6975408 (2005-12-01), Igaki et al.
patent: 7022974 (2006-04-01), Igaki et al.
patent: 7045770 (2006-05-01), Igaki et al.
patent: 2008/0252904 (2008-10-01), Matsumiya et al.
patent: 1 882 908 (2008-01-01), None
patent: 2 280 259 (1995-01-01), None
patent: 2002-323347 (2002-11-01), None
patent: 2003-337052 (2003-11-01), None
Official Communication in European Patent Application No. 09 00 2580, dated Jul. 16, 2009.

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