Leadframe for an encapsulated optocomponent

• US 6,072,229 A
• Filed: 06/30/1997
• Issued: 06/06/2000
• Est. Priority Date: 10/19/1994
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Eriksen, Paul, Steijer, Odd
• Primary Examiner(s): Chaudhuri, O.
• Assistant Examiner(s): Cao, Phat X.
• Application Number:
  US08/817,421
• Time in Patent Office: 1,072 Days
• Field of Search: 257/99, 257/666, 257/669, 257/676, 257/670, 257/674, 257/672, 257/677, 438/106, 438/123, 438/109
• US Class Current: 257/666
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 31/0203 Containers; Encapsulations , e.g. encapsulation of photodiodesfor photovoltaic devices H01L31/048; for organic photosensitive devices H10K30/80

Abstract

In encapsulating an optocomponent a leadframe (51) is used for the electrical connection of the component, the leadframe having a flag (53), to which the main body of the optocomponent is attached. The flag (53) is located asymmetrically at an outer edge of the leadframe and is, in the encapsulating operation, placed close to a sidewall in a mould cavity in a mould. Thereby an optical interface of standard type can be obtained in the wall of the capsule. Further, the flag (53) is flexibly attached, by means of zigzag-shaped bridges (67), to other portions of the leadframe so that the flag and thus the optocomponent will have a possibility to be resiliently and flexibly displaced a little at the positioning thereof in the mould cavity in the mould in relation to the other portions of the leadframe, in particular to its outer frame portions (61) and bridge portions (59). By designing the zigzag-shaped bridges (67) with a suitably adapted width and thickness a controlled elastic restoring force acting on the flag (53) can be obtained and thus on the optocomponent, so that it can be pressed and firmly retained in engagement with positioning means for the optocomponent.

Claims

1. A leadframe of an electrically conductive material for connection of electric terminals of an optocomponent and having substantially rectangular outer edges, the leadframe comprising:

a flag for attachment to a main part of the optocomponent;

connection fingers having ends for electrical connection to the electric terminals on the optocomponent;

support parts extending between the connection fingers and connected to the connection fingers at areas located at a distance from the ends of the connection fingers;

support bridges connecting the flag to the support parts, the support bridges being connected to the support parts; and

ends of the support parts and the flag being located at the same one of the outer edges of the leadframe.

2. The leadframe of claim 1, wherein the flag is centrally located at said one of the outer edges of the leadframe.

3. The leadframe of claim 1, wherein the flag has edges, a first edge of which forms a portion of said one of the outer edge of the leadframe.

4. The lead frame of claim 3, wherein the ends of the connection fingers for electrical connection to the electrical terminals on the component are located next to an edge of the flag, which is opposite to the first edge.

5. The lead frame of claim 1, wherein the ends of the connection fingers for electrical connection to the components are located next to a substantially rectilinear edge of the flag.

6. The leadframe of claim 5, wherein the support parts extend substantially perpendicularly to said substantially rectilinear edge of the flag.

7. The leadframe of claim 1, wherein each of the support bridges has a shape of a band located in one plane, the band being bent alternatingly to one side and then another side, as seen in a movement from a connection area of the bridge at a support part to a connection area at the flag.

8. The leadframe of claim 1, wherein each of the support bridges has a shape of a zigzag band located in one plane.

9. A leadframe of an electrically conductive material for connection of electrical terminals on an optocomponent and having substantially rectangular outer edges, the leadframe comprising:

a flag for attachment to a main part of the optocomponent;

connection fingers having ends for electrical connection to the electrical terminals on the optocomponent;

support parts extending between the connection fingers and connected to the connection fingers at areas located at a distance from the ends of the connection fingers;

support bridges connecting the flag to the support parts; and

the flag being located at one of the outer edges of the leadframe and having rectilinear edges, the ends of all of the connection fingers for electrical connection to the electrical terminals on the component being located next to a first one of the edges of the flag.

10. The leadframe of claim 9, wherein a second one of the edges of the flag forms a portion of said one of the outer edges of the leadframe.

11. The leadframe of claim 10, wherein the first and second edges of the flag are opposite to each other.

12. The leadframe of claim 9, wherein the support parts extend substantially perpendicularly to the first edge of the flag.

13. The leadframe of claim 9, wherein each of the support bridges has a shape of a band located in one plane, the band being bent alternatingly to one side and then another side, as seen in a movement from a connection area of the bridge at a support part to a connection area at the flag.

14. The leadframe of claim 9, wherein each of the support bridges has a shape of a zigzag band located in one plane.

15. The leadframe of claim 13, wherein the support bridges allow the flag to move to adapt the optocomponent to positioning pins.

16. The leadframe of claim 14, wherein the support bridges allow the flag to move to adapt the optocomponent to positioning pins.

17. A leadframe of an electrically conductive material for connection of electrical terminals on an optocomponent and having substantially rectangular outer edges, the leadframe comprising:

a flag for attachment to a main part of the optocomponent;

connection fingers having ends for electrical connection to the electrical terminals on the optocomponent;

support parts extending between the connection fingers and connected to the connection fingers at areas located at a distance from the ends of the connection fingers;

support bridges connecting the flag to the support parts, and;

the flag being located at one of the outer edges of the leadframe and the support parts extending substantially perpendicular to said one of the outer edges of the leadframe.

18. The leadframe of claim 17, wherein each of the support bridges has a shape of a band located in one plane, the band being bent alternatingly to one side and then another side, as seen in a movement from a connection area of the bridge at a support part to a connection area at the flag.

19. The leadframe of claim 17, wherein each of the support bridges has a shape of a zigzag band located in one plane.

20. A leadframe of an electrically conductive material for connection of electrical terminals on an optocomponent and having substantially rectangular outer edges, the leadframe comprising:

a flag for attachment to a main part of the optocomponent;

connection fingers having ends for electrical connection to the electrical terminals on the optocomponent;

support parts extending between the connection fingers and connected to the connection fingers at areas located at a distance from the ends of the connection fingers;

support bridges connecting the flag to the support parts; and

the flag being located at one of the outer edges of the leadframe and each of the support bridges having a shape of a band located in one plane, the band being bent alternatingly to one side and then another side, as seen in a movement from a connection area of the bridge at a support part to a connection area at the flag, to allow the flag to move to adapt the optocomponent to positioning pins.

21. A leadframe of an electrically conductive material for connection of electrical terminals on an optocomponent and having substantially rectangular outer edge, the leadframe comprising:

a flag for attachment to a main part of the optocomponent;

connection fingers having ends for electrical connection to the electrical terminals on the optocomponent;

support parts extending between the connection fingers and connected to the connection fingers at areas located at a distance from the ends of the connection fingers;

support bridges connecting the flag to the support parts; and

the flag being located at one of the outer edges of the leadframe and each of the support bridges having a shape of a zigzag band located in one plane to allow the flag to move to adapt the optocomponent to positioning pins.