REFLECTOR USED FOR OPTICAL ENCODER AND MANUFACTURING METHOD THEREOF

• Main Authors: SASAKI AKITOSHI, WATANABE KENICHI, YAMADA HIROYUKI
• Format: Patent
• Language: English; Japanese
• Published: 12.11.2020
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

To provide a reflector capable of changing the light reflectance of a recess without depending on the light reflectance of a thin film itself.SOLUTION: Regarding the reflector used for the optical encoder, a reflector includes: a mirror surface 11; a plurality of recesses 12 having a bottom surface 13 having a lower light reflectance than a mirror surface 11; and a metal plate 10 having a thin film 30 on at least one side of thereof: the thin film 30 is formed on the bottom surface 13 so that the light reflectance of the recess 12 is lower than the light reflectance of the bottom surface 13 and the light reflectance of the recess 12 changes according to the light reflectance of the bottom surface 13.SELECTED DRAWING: Figure 10 【課題】薄膜自体の光反射率に依存させずに、凹部の光反射率を変化させることが可能な反射板を提供する。【解決手段】光学式エンコーダに用いられる反射板に関し、その反射板は、鏡面１１、鏡面１１よりも光反射率が低い底面１３を有する複数の凹部１２、及び底面１３の上に形成される薄膜３０であって、凹部１２の光反射率を底面１３の光反射率よりも低下させ、かつ底面１３の光反射率に応じて凹部１２の光反射率を変化させる薄膜３０を少なくとも一面側に備える金属板１０からなることを特徴とする。【選択図】図１０