Optical module
Object To prevent deformation of locating pins and breakage of the glass substrate on which locating holes are formed. Means for Solving the Problems There is provided an optical module including: a glass substrate that includes an optical-electric-conversion element, that is transparent to either one of light emitted from the optical-electric-conversion element and light received by the optical-electric-conversion element, and in which a locating hole is formed; and an optical component in which a locating pin is formed, the glass substrate and the optical component being positioned by fitting the locating pin to the locating hole through a protective film so that the protective film is in contact with the locating hole and the locating pin.
1. An optical module, comprising:
a glass substrate
that includes an optical-electric-conversion element,
that is transparent to either one of light emitted from the optical-electric-conversion element and light received by the optical-electric-conversion element, and
in which a locating hole is formed; and
an optical component in which a locating pin is formed,
wherein the locating pin has a tapered surface and is fitted to the locating hole through a protective film,
a recess is formed around a root of the locating pin in the optical component,
the glass substrate and the optical component being positioned by fitting the locating pin to the locating hole through a protective film so that the protective film is in contact with an edge of the locating hole and the tapered surface of the locating pin, and
the protective film is formed beforehand on the edge of the locating hole of the glass substrate, the protective film formed on the surface of the glass substrate being placed between the glass substrate and the recess of the optical component, and a part of the protective film being formed on the surface of the glass substrate.
2. An optical module according to claim 1 , wherein
the locating pin is fitted to the locating hole through the protective film, the protective film being formed beforehand on an edge of the locating hole of the glass substrate.
3. An optical module according to claim 2 , wherein
irregularities of the glass substrate on the edge of the locating hole are covered by the protective film, and
an opening of the locating hole is composed of the protective film.
4. An optical module according to claim 2 , wherein
the protective film is resin film.
5. An optical module according to claim 2 , wherein
the protective film is resin film that is formed together with a passivation film of the glass substrate.
6. An optical module according to claim 2 , wherein
a through via is formed on the glass substrate, and
the protective film is formed by means in which film is laminated on the glass substrate by vacuum lamination.
7. An optical module according to claim 2 , wherein
the protective film is metal film.
8. An optical module according to claim 7 , wherein
the protective film is metal film that is formed together with wiring of the glass substrate.
9. An optical module according to claim 2 , wherein
the locating hole is a non-through hole, and
the protective film is not formed on a bottom of the locating hole.
10. An optical module according to claim 9 , wherein
the protective film is formed
by forming a photosensitive resin layer on a surface of the glass substrate on which the locating hole is formed and
by exposing and developing the resin layer.
11. An optical module according to claim 2 , wherein
the protective film is formed on an inner surface of the locating hole.
12. An optical module according to claim 1 , wherein
the locating hole is a tapered non-through hole, and
the locating pin has a truncated cone shape.
13. An optical module according to claim 1 , wherein
a coefficient of linear expansion of the glass substrate is different from a coefficient of linear expansion of the optical component.
14. An optical module,
comprising:
a glass substrate
that includes an optical-electric conversion element,
that is transparent to either one of light emitted from the optical-electric-conversion element and light received by the optical-electric-conversion element, and
in which a locating hole is formed; and
an optical component in which a locating pin is formed,
wherein the locating pin has a tapered surface,
the glass substrate and the optical component are positioned by fitting the locating pin to the locating hole through a protective film so that the protective film is in contact with an edge of the locating hole and the tapered surface of the locating pin,
an edge of the locating hole is chamfered, and
the protective film is in contact with the tapered surface of the locating pin and a chamfered surface of the locating hole, and a part of the protective film being formed on the surface of the glass substrate.