Optical module and optical module lens cap
AssigneeMitsubishi Electric Corporation
InventorsAkihiro Matsusue, Koichi Nakamura, Hidekazu Kodera
Life of this patent
Estimating the term…
Abstract
An optical module includes an optical module lens cap. The optical module lens cap is produced by press-molding a lens into a barrel. The barrel includes a cover portion and a cylindrical portion. The cover portion includes lens mounting holes. The cover portion includes a top surface and an undersurface that are mutually opposed. The undersurface faces the inside of the cylindrical portion. The barrel is Kovar. The lens is mounted in the lens mounting hole. A low melting point glass layer is located at a rim of the lens mounting hole in the barrel, filling a gap between the lens and the barrel.
Claims12
An optical module comprising:
- a barrel including a cylindrical portion and a cover portion located at a first end of the cylindrical portion, wherein
- the cover portion includes a lens mounting hole,
- a second end of the cylindrical portion is open, and
- the barrel is a material having a first linear expansion coefficient;
- a lens of a lens glass having a second linear expansion coefficient that is larger than the first linear expansion coefficient and press-molded into the lens mounting hole;
- a glass layer located at a rim of the lens mounting hole of the barrel, filling a gap between the lens and the barrel, and having a lower glass transition temperature than the lens glass;
- and
- a stem including a top surface and an optical element located on the top surface, wherein
- the optical element is covered by the barrel, and
- the second end of the cylindrical portion of the barrel is bonded to the top surface.
An optical module comprising:
- a barrel including a cylindrical portion and a cover portion located at a first end of the cylindrical portion, wherein
- the cover portion includes a lens mounting hole,
- a second end of the cylindrical portion is open, and
- the barrel is a material having a first linear expansion coefficient;
- a lens of a lens glass having a second linear expansion coefficient that is larger than the first linear expansion coefficient and press-molded into the lens mounting hole;
- a flat glass located at a rim of the lens mounting hole of the barrel and connected via a glass layer having a lower glass transition temperature than the lens glass;
- and
- a stem including a top surface and an optical element located on the top surface, wherein
- the optical element is covered with the barrel, and
- the second end of the cylindrical portion of the barrel is bonded to the top surface.
An optical module lens cap comprising:
- a barrel including a cylindrical portion and a cover portion located at a first end of the cylindrical portion, wherein
- the cover portion includes a lens mounting hole,
- a second end of the cylindrical portion is open, and
- the barrel is a material having a first linear expansion coefficient;
- a lens of a lens glass having a second linear expansion coefficient that is larger than the first linear expansion coefficient and press-molded into the lens mounting hole;
- and
- a glass layer located at a rim of the lens mounting hole of the barrel, filling a gap between the lens and the barrel, and having a lower glass transition temperature than the lens glass.
An optical module lens cap comprising:
- a barrel including a cylindrical portion and a cover portion located at a first end of the cylindrical portion, wherein
- the cover portion includes a lens mounting hole,
- a second end of the cylindrical portion is open, and
- the barrel is a material having a first linear expansion coefficient;
- a lens of a lens glass having a second linear expansion coefficient that is larger than the first linear expansion coefficient and press-molded into the lens mounting hole;
- and
- a flat glass located at a rim of the lens mounting hole of the barrel and connected via a glass layer having a lower glass transition temperature than the lens glass.
Dependencies are inferred from the claim text.