US 11,703,378 B2
Optical module
Mizuki Shirao, Tokyo (JP); Seiki Nakamura, Tokyo (JP); and Kiyotomo Hasegawa, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Nov. 1, 2021, as Appl. No. 17/515,766.
Application 17/515,766 is a continuation of application No. PCT/JP2019/021364, filed on May 29, 2019.
Prior Publication US 2022/0057256 A1, Feb. 24, 2022
Int. Cl. G01J 1/04 (2006.01); G01J 1/42 (2006.01); H05K 1/14 (2006.01)
CPC G01J 1/0403 (2013.01) [G01J 1/0411 (2013.01); G01J 1/42 (2013.01); H05K 1/147 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical module comprising:
a metal stem including a cylindrical portion in which an FPC inserting portion is formed, and a base standing upright from one plane of the cylindrical portion;
a tubular lens cap with one open end, the tubular lens cap covering the base of the metal stem, having an open end surface fixed in contact with a peripheral portion of the one plane of the cylindrical portion of the metal stem, and having a lens mounted on a bottomed portion of the tubular lens cap;
a ceramic substrate mounted on one plane of the base of the metal stem, and including a signal wiring layer and a ground wiring layer formed on a first main surface of the ceramic substrate;
an optical semiconductor element mounted on the first main surface of the ceramic substrate, having a signal terminal electrically connected to the signal wiring layer of the ceramic substrate and a ground terminal electrically connected to the ground wiring layer of the ceramic substrate, and including a light emitting element to emit light in a direction toward the lens; and
a flexible printed circuit having a first end passing through the FPC inserting portion of the cylindrical portion of the metal stem and facing the one plane of the base of the metal stem, having a second end located outside the metal stem, and including a signal wiring layer formed on a first main surface of the flexible printed circuit so as to extend from the first end to the second end and electrically connected to the signal wiring layer of the ceramic substrate with a metal wire at the first end.