# US 2013/0154447 A1 · Encoder and servo motor

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- Number: US 2013/0154447 A1
- Document ID: US20130154447A1
- Status: Published application
- Kind: A1
- Application number: 13/551,622
- Filed: 2012-07-18
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: Kabushiki Kaisha Yaskawa Denki
- Inventors: Masanobu HARADA
- Web page: https://patentgrep.com/patent/US20130154447A1

## CPC

- G01D 5/24438: {Special design of the sensing element or scale}
- G01D 5/34715: {Scale reading or illumination devices}
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR

## Abstract

An encoder includes a first substrate including a point light source that emits light onto reflective slits formed on a disc and a light-receiving element that receives light emitted from the point light source and reflected by the reflective slits, a second substrate onto which the first substrate is mounted, a lustrous connecting portion configured to electrically connect the first substrate and the second substrate, and a covering material configured to cover the connecting portion in the manner that the point light source and the light-receiving element are exposed.

## Claims

### Claim 1

An encoder comprising:
a first substrate comprising a point light source that emits light onto reflective slits formed on a disc, and a light-receiving element that receives light emitted from the point light source and reflected by the reflective slits;
a second substrate onto which the first substrate is mounted;
a lustrous connecting portion configured to electrically connect the first substrate and the second substrate; and
a covering material configured to cover the connecting portion in the manner that that the point light source and the light-receiving element are exposed.

### Claim 2 (depends on 1)

The encoder according to claim 1, wherein:
the connecting portion comprises:
a first terminal provided to the first substrate;
a second terminal provided to the second substrate; and
a joining portion formed by soldering and configured to join the first terminal and the second terminal, and
the covering material covers at least one of the first terminal, the second terminal, and the joining portion.

### Claim 3 (depends on 2)

The encoder according to claim 2, wherein:
the joining portion is formed by manual soldering.

### Claim 4 (depends on 1)

The encoder according to claim 1, wherein:
the covering material is made of a black material.

### Claim 5

A servo motor comprising:
a motor configured to rotate a shaft; and
an encoder configured to detect a position of the shaft,
the encoder including:
a first substrate comprising a point light source that emits light onto a reflective slits formed on a disc connected to the shaft, and a light-receiving element that receives light emitted from the point light source and reflected by the reflective slits;
a second substrate onto which the first substrate is mounted;
a lustrous connecting portion configured to electrically connect the first substrate and the second substrate; and
a covering material configured to cover the connecting portion in the manner that the point light source and the light-receiving element are exposed.