Patent ID: 8179620

Claim:
An optical module, comprising: a multilayer insulating substrate, having a light transmission hole disposed in a depth direction thereof that is configured to allow light to pass therethrough, the multilayer insulating substrate formed by a lamination of a plurality of single-layer insulating substrates that include a ceramic material, each single-layer insulating substrate having a through-hole, such that a boundary of each through-hole constitutes a different portion of a boundary of the light transmission hole; an optical element flip-chip mounted on an outermost single-layer insulating substrate, and configured to emit light through the light transmission hole; wherein a first single-layer insulating substrate is disposed further from the optical element than a second single-layer insulating substrate, and the first single-layer insulating substrate has a through-hole with a larger diameter than a diameter of a through-hole in the second single-layer insulating substrate.