Photoelectric encoder
US-2018335320-A1 · Nov 22, 2018 · US
Photoelectric encoder
US10648839B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10648839-B2 |
| Application number | US-201815978593-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 14, 2018 |
| Priority date | May 22, 2017 |
| Publication date | May 12, 2020 |
| Grant date | May 12, 2020 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
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.
First claim
Opening claim text (preview).
What is claimed is: 1. 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. 2. 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. 3. 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.
Assignees
Inventors
Classifications
- G01D5/34715Primary
Scale reading or illumination devices · CPC title
- G01D5/36Primary
Forming the light into pulses · CPC title
Scales; Discs, e.g. fixation, fabrication, compensation · CPC title
Linear encoders · CPC title
Electricity · mapped topic
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10648839B2 cover?
- 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 t…
- Who is the assignee on this patent?
- Mitutoyo Corp
- What technology area does this patent fall under?
- Primary CPC classification G01D5/34715. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 12 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).