Reflective optical encoder having resin-made code plate

A reflective optical encoder comprising:

• a code plate which is formed by resin material and has a first major surface and a second major surface opposed to the first major surface;
• a light emitting unit positioned near the first major surface of the code plate;
• and
• a light receiving unit positioned near the first major surface of the code plate,
• wherein the first major surface of the code plate has:
• 1) an incidence portion with a concavo-convex shape allowing light transmitted from the light emitting unit to enter the code plate through the first major surface, and
• 2) an emission portion with a concavo-convex shape allowing the light to exit the code plate through the first major surface, and
• wherein the second major surface of the code plate has a code pattern section including:
• 1) a transmission portion formed from a V-shape, a triangular shape or a curved surface and configured to allow the light to exit the code plate through the second major surface, and
• 2) a total reflection portion formed from a flat surface and configured to totally reflect the light from the second major surface.