US 2015/0090868 A1 · RESIN ENCODER SCALE, MOLD FOR RESIN ENCODER SCALE, METHOD FOR PRODUCING RESIN ENCODER SCALE, AND ENCODER

Abstract

A purpose is to provide a resin encoder scale a cost of which can be reduced by making processing easy by producing the encoder scale as a resin molded piece including a scale pattern. A resin encoder scale is used in a reflection-type optical encoder and a scale pattern for position measurement is provided thereto. In the scale pattern, a low reflection part a surface of which is molded as a rough surface during resin molding and which has low reflectivity of light and a high reflection part a surface of which is molded as a mirror surface during the resin molding and which has higher reflectivity of light than the low reflection part are arranged alternately.

Claims16

Dependent claims

A resin encoder scale used in a reflection-type optical encoder, comprising:

a scale pattern for position measurement,
wherein during resin molding, the scale pattern which is a combination of a low reflection part a surface of which is molded as a rough surface and which has low reflectivity of light and a high reflection part a surface of which is molded as a mirror surface and which has higher reflectivity of light than the low reflection part is provided, and
a reflection film is provided at least on the whole scale pattern.

An encoder comprising:

an encoder scale including a scale pattern which is a combination of a low reflection part having low reflectivity of light and a high reflection part having higher reflectivity of light than the low reflection part;
and
a head including a light emitting element configured to emit light to the encoder scale, and a light receiving element configured to receive light emitted from the light emitting element and reflected by the encoder scale,
wherein when the head moves relative to the encoder scale, a position of the head relative to the encoder scale is measured based on a variation in a quantity of received light in the light receiving element due to a difference between the reflectivity of light of the low reflection part and that of the high reflection part in the scale pattern, and
wherein the encoder scale includes an injection-molded resin,
the scale pattern which is a combination of the low reflection part a surface of which is molded as a rough surface and the high reflection part a surface of which is molded as a mirror surface is provided during the resin molding, and
a reflection film is provided at least on the whole scale pattern.

4 more elements

Dependencies are inferred from the claim text.

Resin encoder scale, mold for resin encoder scale, method for producing resin encoder scale, and encoder

Life of this patent

Resin encoder scale, mold for resin encoder scale, method for producing resin encoder scale, and encoder

Life of this patent

Abstract

Claims16