Photoelectric encoder
AssigneeMitutoyo Corporation
InventorMiyako Mizutani
Life of this patent
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Abstract
Provided is a photoelectric encoder that can achieve higher accuracy while maintaining reliability by reducing stray light. An encoder 1 is a photoelectric encoder including a light source device 2 that emits parallel light, a scale 3 having calibrations C provided along a measurement direction, and a light receiving unit 4 that receives light being emitted from the light source device 2, and transmitted through the scale 3. The encoder 1 includes an antireflection member 30 that prevents stray light generated by being reflected on the scale 3, from entering the light receiving unit 4. Because the encoder 1 includes the antireflection member 30, the encoder 1 can achieve higher accuracy while maintaining reliability by reducing stray light entering the light receiving unit 4.
Claims3
A photoelectric encoder comprising a light source device configured to emit light, a scale having scale pattern alternately including transmissive portions and non-transmissive portions along a longitudinal measurement direction, and a light receiving unit configured to receive light being emitted from the light source device and transmitted through the scale,
- wherein an antireflection member configured to prevent stray light generated by being reflected on the scale, from entering the light receiving unit is included,
- wherein the non-transmissive portions include the antireflection member.
A photoelectric encoder comprising a light source device configured to emit light, a scale having calibrations provided along a measurement direction, and a light receiving unit configured to receive light being emitted from the light source device and transmitted through the scale,
- wherein an antireflection member configured to prevent stray light generated by being reflected on the scale, from entering the light receiving unit is included,
- wherein the light source device includes a lead frame that supplies power and a light emitting unit fixedly supported by the lead frame, and
- wherein the lead frame includes the antireflection member on the entire surface excluding the portion that supports the light emitting unit.
A photoelectric encoder comprising a light source device configured to emit light, a scale having calibrations provided along a measurement direction, and a light receiving unit configured to receive light being emitted from the light source device and transmitted through the scale,
- wherein an antireflection member configured to prevent stray light generated by being reflected on the scale, from entering the light receiving unit is included,
- wherein the light receiving unit includes:
- a base portion that serves as a basement;
- and
- a light receiving portion that is disposed on the base portion, and converts the received light into an electrical signal, and
- wherein the base portion includes
- the antireflection member on the entire surface excluding the light receiving portion.
Dependencies are inferred from the claim text.