Optical rotary encoder, servo motor, and actuator
US11808612B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Mar 15, 2019 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Mar 30, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In this optical rotary encoder, detection tracks of a rotating disc are irradiated with detection light emitted from a light-emitting element. An optical signal obtained via slits in the detection tracks passes through a slit pattern in a fixed slit plate and is received by light-receiving surfaces of a light-receiving element. The slit pattern in the fixed slit plate is formed so as to fit into a range of an effective spot of the detection light. An LED or other light-emitting element that has a small effective spot diameter can be used, which is advantageous in terms of reducing costs and making the device more compact.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.