Encoder including rotating member, light source device and...

Details Encoder including rotating member, light source device and... Encoder including rotating member, light source device and...

2006-11-29

2009-06-09

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140PR, C356S614000, C341S013000

Reexamination Certificate

active

07544925

ABSTRACT:
There is provided an encoder in which the absolute angle can be detected with high accuracy even when the irradiated position of light to be detected with respect to a scale is displaced from a reference. In the encoder1, a bright portion19in which the light to be detected is irradiated to an area containing half rounds of arrangement lines L1and L2of a scale plate11is formed and also a dark portion20to which no light to be detected is irradiated is formed in the area excluding the bright portion19by passing the light to be detected through a rotating plate8having a toothed gear with a semicircular opening portion17formed therein. Accordingly, in the encoder1, even when the irradiated position of the light to be detected with respect to the scale plate11is displaced from the reference, the absolute angle of a measurement target can be detected with high accuracy by adding or subtracting the corrected amount based on the difference α° between the angle range corresponding to the width W at half maximum of the light intensity waveform P at the angle detection time and the reference angle range.

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