Optical module

1. An optical module, comprising:

a lens sheet having one or more lenses formed thereon;

a substrate having a photoelectric conversion device mounted on a first face thereof and having a first penetrating hole formed therethrough between the photoelectric conversion device and the one or more lenses; and

an adhesive layer configured to bond a face of the lens sheet to a second face of the substrate,

wherein the adhesive layer has a second penetrating hole formed therethrough between the one or more lenses and the photoelectric conversion device, and a pathway is provided to connect a space constituted by the first penetrating hole and the second penetrating hole to an outside of the space,

wherein an outer perimeter, below the one or more lenses, of the lens sheet encompasses an entirety of the second penetrating hole in a plan view as viewed in a thickness direction of the lens sheet, and

wherein an outer perimeter of the adhesive layer encompasses an entirety of the second penetrating hole in the plan view, and the pathway extends along or in the adhesive layer to connect the second penetrating hole to an outside of the outer perimeter of the adhesive layer in the plan view.

2. The optical module as claimed in claim 1 , wherein the pathway is formed in the adhesive layer.

3. The optical module as claimed in claim 1 , wherein the pathway is formed in the lens sheet.

4. The optical module as claimed in claim 1 , wherein the pathway is formed in the substrate.

5. The optical module as claimed in claim 1 , further comprising:

an optical waveguide having a mirror formed thereon; and

a second adhesive layer configured to bond a face of the optical waveguide to another face of the lens sheet.