Rigid-flex assembly for high-speed sensor module comprising a flexible wiring section with dual flexible strips stacked and attached together

• US 10,410,760 B2
• Filed: 06/27/2016
• Issued: 09/10/2019
• Est. Priority Date: 01/11/2016
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Neumann, Jay R., McEwan, Thomas F., Sigurdson, David E., Perez, Alberto, Lambe, Janine F., Tracy, Gregory D.
• Primary Examiner(s): Le, Que Tan
• Application Number:
  US15/194,427
• Publication Number:
  US 20170200529A1
• Time in Patent Office: 1,170 Days
• Field of Search: 250239, 250551, 250214 R
• CPC Class Codes: G06F 13/20 for access to input/output bus
• CPC Class Codes: H01B 7/04 Flexible cables, conductors, or cords, e.g. trailing cables
• CPC Class Codes: H01L 27/14636 Interconnect structures
• CPC Class Codes: H01L 27/14652 Multispectral infrared imagers, having a stacked pixel-element structure, e.g. npn, npnpn or MQW structures
• CPC Class Codes: H01P 3/08 Microstrips; Strip lines
• CPC Class Codes: H01R 12/79 connecting to rigid printed circuits or like structures
• CPC Class Codes: H04M 1/0264 for a camera module assembly
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/0243 Printed circuits associated with mounted high frequency components
• CPC Class Codes: H05K 1/0245 Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
• CPC Class Codes: H05K 1/0284 Details of three-dimensional rigid printed circuit boards H05K1/119 takes precedence; shaping of the substrate H05K3/0014
• CPC Class Codes: H05K 2201/10121 Optical component, e.g. opto-electronic component
• CPC Class Codes: H05K 2201/10151 Sensor
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: H05K 3/4691 Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers
• CPC Class Codes: H05K 5/0069 having connector relating features for connecting the connector pins with the PCB or for mounting the connector body with the housing
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A rigid-flex assembly (RFA) includes a circuit board attachable to a focal plane sensor. The RFA includes a flexible wiring section electrically coupled at opposing ends to the circuit board and to an edge connector. The flexible wiring section has a controlled separation distance or volume or vacuum gap between wiring strips for reduction of dielectric electrical loss and electrical cross talk. The flexible section has wires or traces configured to reduce the amount of copper used while optimizing signal integrity. Rigid substrates electrically couple the flexible wiring section to the connector. The RFA uses an end-launch, in-plane connection to the sensor for improved performance. A sensor module includes a housing and a sensor. An RFA is coupled to the sensor for high-speed data transfer and that optimizes signal integrity while providing thermal isolation via the flexible section.

Claims

1. A rigid-flex assembly for high-speed data transfer, the assembly comprising:

a flexible wiring section having a first end and a second end, the first end electrically coupleable to an electrical component for transferring data gathered by a sensor, the flexible wiring section comprising a first flexible strip and a second flexible strip stacked and attached together;

a controlled separation void between the first and second flexible strips having a gap distance optimized between signal integrity and reduced thermal loads;

a first set of electrical traces formed on the first flexible strip;

a second set of electrical traces formed on the second flexible strip, such that the first set of electrical traces oppose the second set of electrical traces about the controlled separation void;

a first rigid substrate attached to the first flexible strip about the second end of the flexible wiring section, and a second rigid substrate attached to the second flexible strip about the second end of the flexible wiring section, such that the first and second rigid substrates are spatially separated from each other and form a stack; and

a connector electrically coupled to the first and second rigid substrates, and attachable to a computer system for processing the data.

2. The assembly of claim 1, wherein the gap distance of the controlled separation void is defined by a distance between sections of the first flexible strip and the second flexible strip of the flexible wiring section.

3. The assembly of claim 1, wherein each of the first and second flexible strips comprises side edge sections that at least partially define the shape of the controlled separation void.

4. The assembly of claim 1, wherein the first set of electrical traces are offset from the second set of electrical traces.

5. The assembly of claim 1, wherein the assembly comprises only a single flexible wiring section coupled to the electrical component such that the electrical component, the first and second rigid substrates, and the connector provides an end-launch, in-plane connection configuration for optimized signal integrity for each signal layer.

6. The assembly of claim 1, further comprising a connector backshell attached to the connector and at least partially supporting the first and second rigid substrates, and further comprising at least one bushing coupled to each of the first and second rigid substrates to facilitate separation of the first and second rigid substrates from each other.

7. The assembly of claim 1, wherein the electrical component is an integrated circuit board assembly, and wherein the sensor comprises a focal plane array module having output data from 1 bps to greater than 2.7 Gbps.

8. The assembly of claim 1, wherein the first and second rigid substrates are spatially separated from each other and are oriented generally parallel relative to each other.

9. The assembly of claim 1, further comprising a third flexible strip stacked and attached to the second flexible strip, wherein at least a section of each of the first, second, and third flexible strips are laminated together, and further comprising a third rigid substrate attached to the third flexible strip.

10. The assembly of claim 1, wherein the flexible wiring section is wrapped or covered with a low emissivity material that reduces thermal loads further while maintaining signal integrity.

26. The assembly of claim 1, further comprising covering or wrapping the flexible wiring section with a low emissivity material to reduce thermal loads further while maintaining signal integrity.

11. A sensor module for capturing and transferring data, the assembly comprising:

a housing;

a sensor within the housing;

an integrated circuit board assembly electrically coupled to the sensor;

a flexible wiring section electrically coupled to the circuit board for transferring data gathered by the sensor, the flexible wiring section comprising a first flexible strip and a second flexible strip stacked and attached together, and a controlled separation void between the first and second flexible strips having a gap distance optimized between signal integrity and reduced thermal loads;

a rigid section electrically coupled to the flexible wiring section; and

a connector electrically coupled to the rigid section and attachable to of a computer system for processing data gathered from the sensor, wherein the flexible wiring section is capable of high-speed data transfer.

12. The sensor module of claim 11, wherein the flexible wiring section is flexed within the housing.

13. The sensor module of claim 11, wherein the first flexible strip comprises a first set of electrical wires, wherein the second flexible strip comprises a second set of electrical wires, and wherein the first and second sets of electrical wires oppose each other within the controlled separation void.

14. The sensor module of claim 11, wherein the connector is an edge connector electrically coupled to the rigid section such that the integrated circuit board, the rigid section, and the connector provide an end-launch, in-plane connection configuration for optimized signal integrity.

15. The sensor module of claim 11, wherein the sensor is a focal plane array.

16. The sensor module of claim 15, wherein the output data speed of the focal plane array is from 1 bps to greater than 2.7 Gbps, and wherein the focal plane array operates from 373K to below 40K.

17. The sensor module of claim 11, wherein the connector further comprises a plurality contact flexures, and wherein the rigid section includes at least one rigid substrate having a plurality of V-pads formed in the at least one rigid substrate and electrically coupled to the plurality of contact flexures to guide the installation and position the contact flexures separately from each other.

18. A method of making a high-speed sensor module, the method comprising:

providing a housing;

attaching a sensor within the housing;

electrically attaching a rigid-flex assembly to the sensor, the rigid-flex assembly comprising;

an integrated circuit board electrically coupled to the sensor;

a flexible wiring section electrically coupled to the circuit board for transferring data gathered by the sensor, the flexible wiring section comprising a first flexible strip and a second flexible strip stacked and attached together, and a controlled separation between the first and second flexible strips void having a gap distance optimized between signal integrity and reduced thermal loads;

a rigid section electrically coupled to the flexible wiring section; and

a connector electrically coupled to the rigid section and attachable to of a computer system for processing data gathered by the sensor, wherein flexible wiring section is capable of high-speed data transfer for optimal signal integrity and to minimize thermal loss.

19. The method of claim 18, further comprising flexing the flexible wiring section within the housing.

20. The method of claim 18, further comprising making the flexible wiring section by coupling the first flexible strip to the second flexible strip positioned opposite the first flexible strip, each flexible strip having electrical wiring for transferring data, whereby a section of the first and second flexible strips define the controlled separation void to minimize thermal loss.

21. The method of claim 18, further comprising arranging the integrated circuit board, the rigid section, and the connector into an end-launch, in-plane connection configuration such that the sensor output data speed is from 1 bps to greater than 2.7 Gbps and operates between 373K and below 40K.

22. The method of claim 18, further comprising spatially separating a plurality of rigid substrates of the rigid section from each other, and further comprising electrically attaching the plurality of rigid substrates to the connector with a plurality of contact flexures electrically connected to V-pads disposed on an upper surface and lower surface of each of the rigid substrates.

23. A rigid-flex device, comprising:

a flexible wiring section having a first end and a second end, the first end electrically coupleable to an electrical component for transferring data gathered by a sensor, the flexible wiring section having a first flexible strip and a second flexible strip stacked and attached together, a separation void and first and second sets of electrical wires opposing each other about the separation void;

at least one rigid substrate electrically coupled to the second end of the flexible wiring section; and

a connector electrically coupled to the at least one rigid substrate, the connector configured to be attached to of a computer system for processing the data.

24. The device of claim 23, wherein the flexible wiring section further comprises a plurality of flexible strips, and including the first and second flexible strips, wherein the at least rigid substrate comprises a plurality of rigid substrates each electrically coupled to respective flexible strips.

25. The device of claim 23, wherein the separation void is defined between respective sections of first and second flexible strips of the plurality of flexible strips, wherein the first flexible strip comprises the first set of electrical wires, and the second flexible strip comprises the second set of electrical wires separated from and opposing the first set of electrical wires across from the separation void.