Optical module for encoder and reflection-type encoder

An optical module for an encoder to be applied to a reflection-type encoder, the optical module comprising:

• a support including a bottom wall part and a side wall part surrounding a region on the bottom wall part when viewed from a thickness direction of the bottom wall part;
• a light receiving element and a light emitting element disposed on the bottom wall part so as to be surrounded by the side wall part;
• a light transmitting member disposed on an end surface of the side wall part on a side opposite to the bottom wall part so as to cover a space surrounded by the side wall part and including a surface facing the bottom wall part;
• and
• a resin member formed on the surface of the light transmitting member, wherein
• the surface of the light transmitting member includes an inner region facing the light emitting element and an outer region surrounding the inner region and facing the end surface,
• the resin member is integrally formed over the inner region and the outer region so as to include a portion facing the light emitting element,
• a refractive index of the resin member with respect to light having a center wavelength of light emitted from the light emitting element is smaller than a refractive index of the light transmitting member with respect to the light having the center wavelength, and
• the light transmitting member is bonded to the side wall part by a portion of the resin member formed on the outer region.