Miniaturized integrated sensor platform

• US 6,045,756 A
• Filed: 10/01/1997
• Issued: 04/04/2000
• Est. Priority Date: 10/01/1996
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Carr, Richard A., Melendez, Jose L., Laney, Kirk S.
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): Lee, Paul J.
• Application Number:
  US08/942,089
• Time in Patent Office: 916 Days
• Field of Search: 422/82.09, 422/82.11, 422/57, 422/82.07
• US Class Current: 422/82.11
• CPC Class Codes: G01N 21/7703 using reagent-clad optical fibres or optical waveguides using measurement of total internal reflection or attenuated total reflection G01N21/552; optical fibres or waveguides per se G02B
• CPC Class Codes: G01N 2201/0221 Portable; cableless; compact; hand-held
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture
• CPC Class Codes: Y10T 29/49131 by utilizing optical sighting device
• CPC Class Codes: Y10T 29/49769 Using optical instrument [excludes mere human eyeballing]
• CPC Class Codes: Y10T 29/53039 with control means energized in response to activator stimulated by condition sensor
• CPC Class Codes: Y10T 29/53087 with signal, scale, illuminator, or optical viewer

Abstract

A miniaturized integrated sensor (50) useful for indicating the presence of a sample analyte is disclosed. The sensor (50) has a platform (52) with an upper surface (53) and a detector (62), light source (60), waveguide (58), and reflective fixtures (60,62) embedded in the platform (52). The light source (60) is preferably a light emitting diode and sits in a cup-shaped dimple (68) that directs light from the light source (60) toward one of the reflective fixtures (64) to uniformly distribute light across the waveguide (58). The waveguide (58) is coupled to an upper surface (53) of the sensor platform (52) and is coated with a thin film of indicator chemistry (70) which interacts with the sample analyte to produce optic signal changes that are measurable by the detector (62). A lead frame (51) in the platform (52) has pins (54, 55, 56) which provide the interface to the outside world. In one embodiment, sensor package (100) has a unique shape that requires a predetermined insertion and removal into an instrument harness or other similar application.

Claims

1. An integrated biochemical sensor package comprising:

a platform;

a waveguide having an upper surface affixed to said platform, said waveguide having a thin layer of chemical coating affixed on said upper surface;

first and second reflective fixtures coupled to opposite extremes of said waveguide and touching said platform;

a light source underlying said first reflective fixture and arranged to emit light outward towards said first reflective fixture;

a detector means embedded in said platform and underlying said second reflective fixture; and

a power source embedded in said platform and having a first lead coupled to said light source and a second lead coupled to said detector.

2. The integrated biochemical sensor package according to claim 1 further comprising:

a lead frame extending from said platform on a place parallel to said thin layer of coating;

a first dimple underlying said first reflective fixture;

wherein said light source is embedded in said first dimple.

3. The integrated biochemical sensor package according to claim 2 wherein said lead frame has three pins extending outward from said platform.

4. The integrated biochemical sensor package according to claim 2 wherein said lead frame has two pins.

5. The integrated biochemical sensor package according to claim 2 further comprising a second dimple underlying said second reflective fixture wherein said detector means sits inside said second dimple.

6. The integrated biochemical sensor package according to claim 1 wherein said waveguide is made of a light transmissive material.

7. The integrated biochemical sensor package according to claim 1 wherein said light source is a series combination of a diode and resistor.

8. The integrated biochemical sensor package according to claim 1 wherein said detector means is an photo diode amplifier chip.

9. The integrated biochemical sensor package according to claim 1 wherein said light source is a single high intensity light emitting diode.

10. The integrated biochemical sensor package according to claim 1 wherein said platform forms a substantially rectangular shaped enclosure for housing various sensor components.

11. The integrated biochemical sensor package according to claim 1 wherein said platform has a substantially trapezoidal shape.

12. The integrated biochemical sensor package according to claim 1 wherein said waveguide is integrally molded on said platform.

13. A miniaturized integrated biochemical sensor for indicating the presence of a given sample based comprising:

a sensor platform having a substantially rectangular box shape form, said platform having a substantially at upper surface and at least one end;

a waveguide coupled to said upper surface of said platform, said waveguide having a first end and a second end opposite from one an other;

a first reflective fixture coupled to said first end of said waveguide and touching said upper surface of said platform;

a second reflective fixture coupled to said second end of said waveguide and touching said upper surface of said platform;

a light source embedded in said platform under said first reflective fixture;

a detector embedded in said platform opposite said light source about said one end of said platform and underlying said second reflective fixture; and

a power source embedded in said platform, the power source having a first lead coupled to said light source and a second lead coupled to said detector.

14. The miniaturized integrated biochemical sensor of claim 13 wherein said light source is a light emitting diode.

15. The miniaturized integrated biochemical sensor of claim 13 further comprising:

a three-pin lead frame extending from said one end of said platform; and

a first dimple forming a substantially cup-shaped area on one pin of said lead frame and surrounding said light source under said first reflective fixture.

16. The miniaturized integrated biochemical sensor of claim 13 further comprising:

a two-pin lead frame extending from said one end of said platform.

17. The miniaturized integrated biochemical sensor of claim 13 wherein a thin layer of chemical coating is deposited on said waveguide.

18. A sensor package suitable for biochemical sensing applications comprising:

a substantially rectangular device platform;

a light transmissive waveguide coupled to an upper surface of said platform and a surface with an indicator chemistry coat deposited thereon;

first and second reflective fixtures coupled to opposite ends of said waveguide about said platform;

a lead frame embedded in said platform and having a plurality of pins extending out from one end of said platform, said lead frame having a first dimple underlying said first reflective fixture and a second dimple underlying said second reflective fixture;

a light source sitting in said first dimple under said first reflective fixture;

a detector means sitting in said second dimple under said second reflective fixture, said detector means configured about said platform to optically receive light from said light source via said first reflective fixture through said waveguide and then through said second reflective fixture; and

a power source embedded in said platform and having a first lead coupled to said light source and a second lead coupled to said detector means.