Connector apparatus

• US 4,225,213 A
• Filed: 12/23/1977
• Issued: 09/30/1980
• Est. Priority Date: 12/23/1977
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Delagi, Richard G., McBride, Lyle E. Jr.
• Primary Examiner(s): Hille, Rolf G.
• Application Number:
  US05/863,758
• Time in Patent Office: 1,012 Days
• Field of Search: 350/96.10, 350/96.20, 250/227, 250/239, 250/552, 357/17, 357/18, 357/72, 357/74
• US Class Current: 385/89
• CPC Class Codes: G02B 6/423 using guiding surfaces for the alignment
• CPC Class Codes: G02B 6/4249 comprising arrays of active devices and fibres
• CPC Class Codes: H01L 27/153 in a repetitive configuration, e.g. LED bars
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 31/12 structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto semiconductor devices with at least one potential barrier or surface barrier adapted for light emission H01L33/00; amplifiers using electroluminescent element and photocell H03F17/00; electroluminescent light sources per se H05B33/00

Abstract

A connector assembly comprises a lead frame mounting one or more semiconductor chips, having optically active areas, a fiber guide and optical fibers held in optical communication with the chips. The fiber guide is formed of a plate like member having two or more reference points, in order to precisely locate the fibers relative to the chip. Several embodiments of the guide are shown including a plate having fiber receiving bores extending therethrough as well as a plate having fiber receiving grooves extending along sides thereof preferably used in conjunction with a bar biased against fibers disposed in the grooves. The bar, which may be made of elastomeric material is shown having a straight edge facing the grooves while a variation of the bar is provided with an additional set of grooves. The lead frame mounts a relatively large thermally and electrically conductive pad which in turn mounts the semiconductor chip having optically active areas. Fibers are trained through respective bores or grooves and epoxied in alignment with respective optically active areas. The connector is adapted to be mounted on one side of a backplane while the electronic components such as drivers and amplifiers, associated with matching electrical characteristics of transmitting and receiving circuitry to those of the photo emitting and detecting elements of the chip are mounted on a second side of the backplane. A single connector may contain either or both photo emitting and photo detecting elements.

Claims

1. Apparatus for interfacing between an electronic circuit and optical fibers comprising a housing composed of electrically insulative plastic material having a first side with an aperture therethrough and a second side with at least one row of apertures therethrough, a lead frame mounted in the housing, the lead frame including a plurality of electrically conductive elements having first and second end portions, the first end portion formed into terminal configurations, each terminal configuration aligned with a respective aperture in the second side of the housing, a relatively massive thermally and electrically conductive pad disposed on the second end portion of one of the lead frame elements, a semi-conductor chip bonded to the pad, the chip having a plurality of optical elements, each optical element having a bonding pad, electrically conductive leads connecting each bonding pad with a respective second end portion of the other lead frame elements, a guide plate formed of moldable plastic material overlying the chip, the plate having fiber guiding surfaces formed therein and having indexing surfaces for properly locating the fiber guiding surface relative to the optical elements of the chip, and a cable comprising a plurality of optical fibers extending through the aperture on the first side of the housing with respective fibers received on the fiber guiding surfaces and in optical communication with respective optical elements.

2. Apparatus according to claim 1 in which the guide plate has a top and bottom surface and a plurality of bores extend through the plate from the top to the bottom surface, one of the top and bottom surfaces formed to meet the bores in a tapered surface to facilitate reception of a respective individual optical fiber therethrough.

3. Apparatus according to claim 1 in which stress relief means is provided to prevent dislocation of or cracking of the optical fiber means.

4. Apparatus according to claim 1 in which the said tapered surface is a smooth curve.

5. Apparatus according to claim 1 in which the thickness of the plate from the top surface to the bottom surface is significantly greater than the diameter of the bores.

6. Apparatus according to claim 1 in which a recess is formed in the bottom of the plate, the recess being adapted to receive the chip therein, and stop surfaces extend below the bottom surface of the plate a selected distance in order to provide selected spacing between the chip and the bottom surface of the guide plate.

7. Apparatus according to claim 1 in which a row of grooves are formed in the plate extending from a top surface to a bottom surface of the plate.

8. Apparatus according to claim 7 including a bar element adapted to be biased against fibers received in the grooves to maintain the fibers in their respective selected grooves.

9. Apparatus according to claim 1 in which the optical elements comprise emitter elements and detector elements, and the guide plate has two rows of bores, each bore being adapted to receive therethrough an individual optical fiber, the fibers in one row coupled to respective emitter elements and the fibers in the other row coupled to respective detector elements.

10. Apparatus according to claim 8 in which the bar element is formed of elastomeric material.

11. Apparatus according to claim 1 in which the optical elements comprise emitter elements and detector elements, and the guide plate has two rows of grooves, each groove being adapted to receive therein an individual optical fiber, and two bar elements adapted to be biased against fibers received in the grooves to maintain the fibers in their respective selected grooves, the fibers in one row coupled to respective emitter elements and the fibers in the other row coupled to respective detector elements.

12. Apparatus according to claim 11 in which the two bar elements are formed of elastomeric material.

13. Apparatus according to claim 1 in which the optical elements of the semi-conductor chip are photo emitting elements and further including a second semiconductor chip having photo detector elements disposed in the housing, and optical fibers are positioned in optical communication with the detector elements as well as the emitting elements.

14. Apparatus according to claim 1 in which the terminal configurations comprises female sockets.

15. Apparatus for interfacing between an electronic circuit and optical fibers comprising a housing composed of electrically insulative plastic material having a first side with an aperture therethrough and a second side with at least one row of apertures therethrough, a lead frame mounted in the housing, the lead frame including a plurality of electrically conductive elements having first and second end portions, the first end portion formed into generally female shaped terminal configurations, each terminal configuration aligned with a respective aperture in the second side of the housing, a relatively massive thermally and electrically conductive pad disposed on the second end portion of one of the lead frame elements, a semi-conductor chip bonded to the pad, the chip having a plurality of optical elements, each optical element having a bonding pad, electrically conductive leads connecting each bonding pad with a respective second end portion of the other lead frame elements, a guide plate formed of moldable plastic material overlying the chip, the plate having fiber guiding surfaces formed therein and having indexing surfaces for properly locating the fiber guiding surface relative to the optical elements of the chip, a cable comprising a plurality of optical fibers extending through the aperture in the first side of the housing, respective fibers received on the fiber guiding surfaces and biased against respective optical elements in optical communication therewith, and clear epoxy disposed between the fibers and their respective optical elements.