Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2005-01-04
2005-01-04
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S23700G, C250S231140
Reexamination Certificate
active
06838688
ABSTRACT:
There is provided a displacement measuring device of which assembled state can be determined optically with ease. There is also provided a light spot position sensor usefully applicable in determination of the assembled state of the displacement measuring device. An optical encoder comprises a scale and a sensor head that is arranged opposite to the scale and can move relative to the scale. The sensor head includes a sensor substrate, on which an index grating and a photosensitive device array are formed. The sensor substrate is also employed to mount a light spot position sensor and a light source for providing a light beam entering the light spot position sensor via the scale to configure a state detection system for detecting an assembled state.
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Luu Thanh X.
Mitutoyo Corporation
Sohn Seung C.
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