Dual segment molded lead frame connector for optical transceiver modules
View Patent ↗Exemplary embodiments of the present invention illustrate lead frame connectors for connecting optical sub-assemblies to printed circuit boards in optical transceiver modules. The lead frame connectors include a stamped and bent conductive lead structure that is encased in a plurality of insert injection molded plastic casings. The plastic casings provide electrical insulation for the conductors in the lead frame as well as mechanical support for the finished component. The lead frame connectors connect to the leads associated with the optical sub-assemblies and are surface mounted onto the printed circuit board to establish connectivity between the optical sub-assembly and the printed circuit board.
1. A lead frame connector for connecting an optoelectronic device to a printed circuit board, the lead frame connector comprising:
an electrically insulating case having a first part separated from a second part; and
a plurality of conductors that are electrically isolated one from another by the electrically insulating case, each of the plurality of conductors forming an electrical contact restrained in a fixed position by the first part, each of the electrical contacts having a hole formed therein configured to receive a corresponding lead of an optoelectronic device, and each of the plurality of conductors having a contact end extending through the second part.
2. A lead frame connector as defined in claim 1 , wherein each contact end extends from the second part and is connectable to a respective conductive structure on a printed circuit board.
3. A lead frame connector as defined in claim 1 , wherein the conductors are bent at a location between the first part and the second part.
4. A lead frame connector as defined in claim 1 , wherein the first part and the second part of the electrically insulating case are insert injection molded over a portion of the plurality of conductors.
5. A lead frame connector as defined in claim 1 , wherein said electrically insulating case comprises a dielectric.
6. A lead frame connector as defined in claim 1 , wherein the lead frame connector is configured to be connected to a printed circuit board without the use of lead solder.
7. A lead frame connector as defined in claim 1 , wherein the lead frame connector meets at least a portion of the requirements outlined in the Reduction of Hazardous Substances (ROHS) Directive.
8. A lead frame connector as defined in claim 1 , wherein the first part and the second part are substantially coplanar.
9. A lead frame connector as defined in claim 1 , wherein at least one of the plurality of conductors is plated.
10. A lead frame connector as defined in claim 9 , wherein the plating comprises at least one of or any combination of nickel, palladium, or gold.
11. A lead frame connector as defined in claim 1 , wherein the width and shape of the conductors are selected to control impedance of the conductors.
12. An apparatus comprising:
a printed circuit board; and
a lead frame connector, comprising:
an electrically insulating case having a first part separated from a second part; and
a plurality of conductors that are electrically isolated one from another by the electrically insulating case, each of the plurality of conductors forming an electrical contact restrained in a fixed position by the first part and each of the plurality of conductors having a contact end extending through the second part, wherein each contact end is electrically coupled to a respective pad of the printed circuit board.
13. An apparatus as defined in claim 12 , further comprising:
an optoelectronic device electrically coupled to the lead frame connector.
14. An apparatus as defined in claim 13 , wherein the optoelectronic device is either a transmitter optical sub-assembly or a receiver optical sub-assembly.
15. An apparatus as defined in claim 14 , wherein each of the plurality of electrical contacts has a hole configured to receive a corresponding lead of one of the optical sub-assemblies.
16. An apparatus as defined in claim 12 , wherein the first part and the second part are substantially coplanar.
17. An apparatus as defined in claim 12 , wherein the conductors have a bent shape.
18. A lead frame connector comprising,
a first casing;
a second casing; and
a plurality of conductors, each of which is:
supported by the first casing and by the second casing; and
includes first and second ends, the first end defining a first electrical contact configured to be electrically connected to an optoelectronic device and at least a portion of the first end being positioned within the first casing, wherein the first electrical contact of each conductor defines an opening configured to receive a portion of a corresponding lead of an optical sub-assembly, and the second end defining a second electrical contact being configured to be electrically connected to a printed circuit board, and each conductor extending out of the first casing, into a first side of the second casing, through the second casing, and out of a second side of the second casing.
19. A lead frame connector as defined in claim 18 , wherein the second electrical contact of each conductor is configured to be electrically coupled to a corresponding pad of a printed circuit board.
20. An optical transceiver comprising:
a printed circuit board;
a transmitter optical sub-assembly;
a receiver optical sub-assembly;
a first lead frame connector electrically coupled to the transmitter optical sub-assembly and to the printed circuit board, the first lead frame connector comprising:
a first casing;
a second casing; and
a plurality of conductors, each of which:
is supported by the first casing and by the second casing; and
includes first and second ends, the first end defining a first electrical contact electrically connected to the transmitter optical sub-assembly and at least a portion of the first end being positioned within the first casing, the second end defining a second electrical contact that is electrically connected to the printed circuit board, and each conductor extending out of the first casing, into a first side of the second casing, through the second casing, and out of a second side of the second casing; and
a second lead frame connector electrically coupled to the receiver optical sub-assembly and to the printed circuit board, the second lead frame connector comprising:
a first casing;
a second casing; and
a plurality of conductors, each of which:
is supported by the first casing and by the second casing; and
includes first and second ends, the first end defining a first electrical contact electrically connected to the receiver optical sub-assembly and at least a portion of the first end being positioned within the first casing, the second end defining a second electrical contact that is electrically connected to the printed circuit board, and each conductor extending out of the first casing, into a first side of the second casing, through the second casing, and out of a second side of the second casing.